Prefabricated fireproof air duct

Abstract

The utility model relates to the technical field of air pipes, in particular to a prefabricated fireproof air pipe which comprises an inner-layer steel plate, an outer-layer steel plate, a plugging piece, a filling piece and a connecting piece, and the outer-layer steel plate is arranged on the outer side of the inner-layer steel plate in a sleeving mode and connected with the inner-layer steel plate through the connecting piece; a groove body is defined by the inner-layer steel plate and the outer-layer steel plate, and the groove body is provided with openings in the two ends in the extending direction of the inner-layer steel plate; the number of the plugging pieces is two, the two plugging pieces plug the openings in the two ends respectively, and at least one plugging piece is provided with a feeding hole and a discharging hole corresponding to the filling piece. The groove body is filled with the filling piece, and the filling piece is used for heat preservation, heat insulation and fire prevention. The integrated air pipe does not need to be additionally fixed, is a prefabricated finished product, is convenient to construct and reduces the construction time, and the inner-layer steel plate, the outer-layer steel plate and the filling piece form a three-layer fireproof structure, so that the fireproof performance is excellent.

Description

Technical Field

[0001] This utility model relates to the field of air duct technology, specifically to prefabricated fireproof air ducts. Background Technology

[0002] By 2025, my country will have initially established a framework for a high-quality development system for the construction industry, with significant improvements in the levels of industrialization, digitalization, and intelligence in construction, remarkable achievements in the green transformation of construction methods, and accelerated transformation of the construction industry from large to strong, providing strong support for the formation of a robust domestic market and the construction of a new development pattern. At the same time, the country's requirements for fire protection standards are becoming increasingly stringent, and fire-resistant ventilation ducts are one aspect of fire protection equipment.

[0003] Currently, the market mainly uses metal sheet ductwork and composite sheet ductwork to make smoke control and exhaust systems work more effectively. However, these two types of ductwork have the following problems:

[0004] 1. Performance and quality are greatly affected by installation quality, resulting in unstable product quality.

[0005] 2. The increased weight due to the flexible outer wrapping or board insulation increases the probability of falling.

[0006] 3. The outer structure is easily damaged, which can lead to fiber exposure and ultimately affect fire resistance.

[0007] 4. After being transported to construction sites and other areas, the ductwork needs to be assembled manually, making it difficult to guarantee its quality.

[0008] 5. It has an adhesive layer, which poses a risk of adhesive layer failure, making it difficult to guarantee the airtightness of the pipe body.

[0009] Therefore, how to overcome the shortcomings of the existing technology mentioned above has become the subject of this utility model. Utility Model Content

[0010] The purpose of this invention is to provide a prefabricated fireproof air duct.

[0011] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0012] A prefabricated fireproof air duct includes an inner steel plate, an outer steel plate, sealing components, fillers, and connectors. The outer steel plate is located outside the inner steel plate and connected to it via the connectors. The inner and outer steel plates enclose a trough, which has openings at both ends along the duct's extension direction. Two sealing components are provided, each sealing one of the openings at both ends. At least one sealing component has an inlet and an outlet corresponding to the filler. The filler fills the trough and serves for heat insulation, thermal insulation, and fireproofing.

[0013] In the above solution, the inner steel plate, outer steel plate, sealing components, filling components, and connectors can be assembled into a prefabricated integrated air duct. In actual use, there is no need to fix the internal structures or to wrap the outside for fixation, allowing for rapid deployment and saving construction time. In addition, the final performance and quality of the prefabricated integrated air duct are not dependent on the installation quality, reducing the impact of manual installation quality and improving product quality stability. Furthermore, the prefabricated integrated air duct does not require external wrapping or board insulation, thus eliminating the risk of external wrapping or board insulation falling off. At the same time, its outer structure is made of steel plate, which is stable and not easily damaged, avoiding the situation in traditional air ducts where the outer structure fibers are exposed, leading to a decrease in fire resistance. In addition, the prefabricated integrated air duct eliminates the self-tapping screws, adhesives, and splicing fasteners used in traditional air ducts, without compromising the overall rigidity and airtightness of the duct body.

[0014] In a further technical solution, the filler is provided with a number of air storage holes.

[0015] In a further technical solution, the longitudinal section of the combined structure of the inner steel plate and the outer steel plate is shaped like a U-shape or a ring.

[0016] In a further technical solution, both of the aforementioned sealing components are provided with the feed hole and the discharge hole.

[0017] A further technical solution is that the sealing component includes at least two U-shaped clips, each of which cooperates to seal the corresponding opening; the feed hole and the discharge hole are disposed on the same U-shaped clip within the corresponding sealing component, or the feed hole and the discharge hole are disposed on different U-shaped clips within the corresponding sealing component.

[0018] A further technical solution also includes a flange, wherein the flange is configured as a single flange and sleeved on the outside of any one of the sealing components, or the flange is configured as two flanges and the two flanges are respectively sleeved on the outside of the two sealing components.

[0019] In a further technical solution, the flange is connected to the inner steel plate and the outer steel plate via the connector, or the flange is connected to the sealing element, the inner steel plate and the outer steel plate via the connector.

[0020] In a further technical solution, the connector includes a plurality of screws.

[0021] In a further technical solution, the filler includes either silicate-based foamed cement or magnesium-based foamed cement.

[0022] The terms "first," "second," etc., used in this article do not specifically refer to order or sequence, nor are they intended to limit this case; they are merely used to distinguish components or operations described using the same technical terms.

[0023] The terms "connection" or "positioning" as used in this article can refer to two or more components or devices making direct physical contact with each other, or making indirect physical contact with each other, or to two or more components or devices operating or moving with each other.

[0024] The terms “include,” “including,” and “have” used in this article are all open-ended, meaning they include but are not limited to.

[0025] Unless otherwise specified, the terms used herein generally have their ordinary meaning in the context of the art, the subject matter, and the specific context. Certain terms used to describe this case will be discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in describing the case.

[0026] The terms “front,” “back,” “up,” “down,” “left,” and “right” used in this article are directional terms. In this case, they are only used to describe the positional relationship between the structures and are not intended to limit the specific direction of the protection scheme or its actual implementation.

[0027] The working principle and advantages of this utility model are as follows: The inner steel plate, outer steel plate, sealing component, filling component, and connecting component can be assembled into a prefabricated integrated air duct. In actual use, it is not necessary to fix the internal structures or to cover them with external wrapping materials for fixing. It can be put into use quickly, saving construction time. In addition, the final performance and quality of the prefabricated integrated air duct do not depend on the installation quality, and the impact of manual installation quality is reduced, thus improving the stability of product quality. Furthermore, the prefabricated integrated air duct does not require external wrapping or board wool, so there is no risk of external wrapping or board wool falling off. At the same time, its outer structure is made of steel plate, which is stable and not easily damaged, and there is no situation in traditional air ducts where the outer structure fibers are exposed, resulting in a decrease in fire resistance. In addition, the prefabricated integrated air duct eliminates the self-tapping screws, adhesive layers, and splicing fasteners used in traditional air ducts, without compromising the overall rigidity and airtightness of the duct body. Attached Figure Description

[0028] Appendix Figure 1 This is a schematic diagram of the structure of the prefabricated fireproof air duct according to an embodiment of the present invention;

[0029] Appendix Figure 2 This is a cross-sectional view of a prefabricated fireproof air duct according to an embodiment of the present utility model;

[0030] Appendix Figure 3for Figure 2 A structural diagram omitting the filler components;

[0031] Appendix Figure 4 This is a partial structural cross-sectional view of the prefabricated fireproof air duct according to an embodiment of the present utility model.

[0032] In the attached diagrams: 1. Inner steel plate; 2. Outer steel plate; 3. Sealing component; 31. U-shaped clip; 4. Filler component; 5. Connector component; 51. Screw; 6. Feed port; 7. Discharge port; 8. Flange; 9. Tank body. Detailed Implementation

[0033] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0034] Example: The present invention will be clearly described below with illustrations and detailed description. Any person skilled in the art who understands the examples of the present invention can make changes and modifications based on the technology taught in the present invention without departing from the spirit and scope of the present invention.

[0035] The terminology used herein is for the purpose of describing specific embodiments only and is not intended to limit the scope of this work. Singular forms such as “a,” “this,” “this,” “the,” and “the” as used herein also include plural forms.

[0036] See appendix Figure 1 -Appendix Figure 4 A prefabricated fireproof air duct includes an inner steel plate 1, an outer steel plate 2, sealing components 3, filler components 4, and connectors 5. The outer steel plate 2 is sleeved on the outside of the inner steel plate 1 and connected to the inner steel plate 1 through the connectors 5. The inner steel plate 1 and the outer steel plate 2 enclose a groove 9, and the groove 9 has openings at both ends along the extension direction of the inner steel plate 1. Two sealing components 3 are provided, and the two sealing components 3 respectively seal the openings at both ends. At least one sealing component 3 is provided with an inlet hole 6 and an outlet hole 7 corresponding to the filler components 4. The filler components 4 fill the groove 9 and are used for heat preservation, heat insulation, and fireproofing.

[0037] The inner steel plate 1 and the outer steel plate 2 form the main structure of the duct. The actual flow area in the duct is the inner side area of ​​the inner steel plate 1, while the outer steel plate 2 can be regarded as the outer wall of the duct. Compared with the traditional duct's outer structure being a flexible outer wrap or a board cotton setting, the outer structure in this application is a steel plate structure, which is more aesthetically pleasing, less prone to damage, and improves the duct's lifespan.

[0038] The inner steel plate 1 and the outer steel plate 2 are connected by a connector 5. The inner steel plate 1 divides the inner area of ​​the outer steel plate 2 into a first area and a second area, and the inner steel plate 1 itself occupies part of the inner area of ​​the outer steel plate 2. The first area is the actual flow area in the duct, and the second area is the trough 9.

[0039] The inner steel plate 1 and the outer steel plate 2 have fireproof and other functions and can be regarded as a two-layer fireproof structure. The inner steel plate 1 and the outer steel plate 2 are not attached to each other. The groove 9 between them can be regarded as a third-layer fireproof structure. The filler 4 fills the groove 9 and acts as the third-layer fireproof structure. The three fireproof structures work together to achieve excellent fireproof performance and ensure that the fireproof performance of this application meets the expectations.

[0040] The filler 4 can enter the tank 9 through the feed hole 6, and excess filler 4 can be discharged through the discharge hole 7. Before the filler 4 fills the tank 9, the tank 9 has an air layer or a vacuum layer (the air in the tank 9 can be extracted through the feed hole 6 or the discharge hole 7). After the filler 4 fills the tank 9, it forms a filling layer, and the air is discharged from the tank 9. The filling layer in the tank 9 improves fire resistance and other effects.

[0041] The tank 9 has openings at both ends, and the sealing parts 3 seal the openings at both ends. At this time, without considering the feed hole 6 and the discharge hole 7, the tank 9 is a closed structure, which facilitates the loading of the filler 4.

[0042] The inner steel plate 1, outer steel plate 2, sealing component 3, filling component 4, and connector 5 can be assembled into a prefabricated integrated air duct. In actual use, there is no need to fix the internal structures or to wrap the outside for fixing, allowing for quick deployment and saving construction time. In addition, the final performance and quality of the prefabricated integrated air duct are not dependent on the installation quality, reducing the impact of manual installation quality and improving product quality stability. Furthermore, the prefabricated integrated air duct does not require external wrapping or board insulation, thus eliminating the risk of external wrapping or board insulation falling off. At the same time, its outer structure is made of steel plate, which is stable and not easily damaged, avoiding the situation in traditional air ducts where the outer structure fibers are exposed, leading to a decrease in fire resistance. In addition, the prefabricated integrated air duct eliminates the self-tapping screws, adhesives, and splicing fasteners used in traditional air ducts, without compromising the overall rigidity and airtightness of the duct body.

[0043] For prefabricated integrated air ducts, design, manufacturing, installation, and operation and maintenance are based on BIM technology. The factory is fully prefabricated and standardized, the quality of the finished product is controllable, and there is no need for secondary processing on the construction site, which saves labor costs.

[0044] In actual use, the above integrated air duct can be arranged horizontally or vertically, and can be used alone or in combination with other air ducts. For each structure inside the air duct, its specific setting can be adjusted according to the actual situation. Taking the inner steel plate 1 as an example, the length of the inner steel plate 1 is not fixed (such as set to 1200 mm) and the thickness (such as set to 0.5 mm) is also not fixed.

[0045] The above describes the connection method between the inner steel plate 1 and the outer steel plate 2. Here, it is supplemented that the connector 5 can connect the inner steel plate 1, the outer steel plate 2, and the plugging member 3. Or, the plugging member 3 is connected to at least one of the inner steel plate 1 and the outer steel plate 2 separately by welding or other means.

[0046] In this embodiment, a number of air storage holes (not shown in the figure) are provided in the filling member 4.

[0047] The filling member 4 fills the groove body 9 and discharges the air in the groove body 9. During the filling process, part of the air enters the air storage holes in the filling member 4, so that the filling member 4 contains a number of air layers. The air in the air layer hardly flows and belongs to an adiabatic medium, which can cut off heat exchange and further improve the fire prevention and other effects of the filling layer. Here, it is also supplemented that this application has better performance in terms of fire prevention, heat insulation, etc. In terms of heat preservation, even if not clearly stated, the role of this application in this aspect should be considered.

[0048] In this embodiment, the longitudinal section of the combined structure of the inner steel plate 1 and the outer steel plate 2 is in a square frame shape.

[0049] The inner steel plate 1 and the outer steel plate 2 can adopt different shapes. In this embodiment, both are hollow square bodies, so as to make the longitudinal section of their combined structure in a square frame shape. In the following, they can be regarded as hollow square bodies for easy understanding and description. In actual use, they can be set in structures other than hollow square bodies.

[0050] In this embodiment, both of the two plugging members 3 are provided with the feed hole 6 and the discharge hole 7.

[0051] As mentioned above, at least one plugging member 3 is provided with the feed hole 6 and the discharge hole 7 corresponding to the filling member 4. In this embodiment, the feed hole 6 and the discharge hole 7 are provided on both of the two plugging members 3.

[0052] When injecting the filling member 4, the above integrated air duct in the prefabricated form can be arranged horizontally or vertically. When arranged vertically, only one of the plugging members 3 needs to be provided with the feed hole 6 and the discharge hole 7. When arranged horizontally, by providing the feed hole 6 and the discharge hole 7 on both of the two plugging members 3, the injection speed of the filling member 4 can be increased.

[0053] Taking feed hole 6 as an example, the size, shape and other settings of feed hole 6 can be adjusted according to actual needs. For example, feed hole 6 can be set as a square hole.

[0054] In this embodiment, the sealing member 3 includes at least two U-shaped clips 31, each of which cooperates to seal the corresponding opening; the feed hole 6 and the discharge hole 7 are disposed on the same U-shaped clip 31 within the sealing member 3, or the feed hole 6 and the discharge hole 7 are disposed on different U-shaped clips 31 within the sealing member 3.

[0055] In this embodiment, the sealing component 3 is a combined structure. This configuration has the advantages of wide applicability and high reusability. Different ducts have different specific configurations. For example, the thickness of the channel 9 is different. In this case, the U-shaped clips 31 can be modified to adapt to different channels 9. For example, some channels 9 are triangular structures and some are square structures. The U-shaped clips 31 of the sealing component 3 can be disassembled for use, so that each U-shaped clip 31 can be used selectively, making the use more flexible.

[0056] Taking the example of both the inner steel plate 1 and the outer steel plate 2 being hollow square bodies, the trough 9 is set as a rectangular structure, and the openings at both ends of the trough 9 are U-shaped. Without considering the possible branch structures of the U-shaped card 31 (such as structures extending into the inner side of the inner steel plate 1) and only considering the actual sealing structure on the U-shaped card 31, the sealing component 3 may include four U-shaped cards 31 (including two long-side U-shaped cards 31 and two short-side U-shaped cards 31). All four U-shaped cards 31 may be square structures or trapezoidal structures (such as right trapezoids or isosceles trapezoids). At this time, the feed hole 6 and the discharge hole 7 may be set on the same U-shaped card 31 or on two U-shaped cards 31 respectively. The thickness of the U-shaped card 31 may be set to 0.5 mm.

[0057] In this embodiment, a flange 8 is also included. The flange 8 is configured as a single flange and is sleeved on the outside of any one of the sealing components 3, or the flange 8 is configured as two flanges and the two flanges 8 are respectively sleeved on the outside of the two sealing components 3.

[0058] Optionally, flange 8 can be configured as an angle steel flange.

[0059] As mentioned above, integrated air ducts can be arranged horizontally or vertically, and can be used alone or in conjunction with other air ducts. Taking two air ducts as an example, when the two air ducts are used together, the two air ducts can be connected through flange 8. By setting the integrated air duct to include flange 8 when it is not put into use initially, the prefabrication degree of the integrated air duct can be further improved, and construction time can be further saved.

[0060] When multiple ducts are used together to form a combined duct, some ducts are located at both ends of the combined duct and some ducts are located between the two ducts. For the ducts located at both ends of the combined duct, only one flange 8 needs to be set inside. For the ducts located between the two ducts, two flanges 8 need to be set inside.

[0061] In this embodiment, the flange 8 is connected to the inner steel plate 1 and the outer steel plate 2 via the connector 5, or the flange 8 is connected to the sealing member 3, the inner steel plate 1 and the outer steel plate 2 via the connector 5.

[0062] The main function of connector 5 is to connect the inner steel plate 1 and the outer steel plate 2, thereby keeping the main structure of the duct stable. In addition, connector 5 can connect the inner steel plate 1, the outer steel plate 2 and the flange 8, or it can connect the inner steel plate 1, the outer steel plate 2, the flange 8 and the sealing component 3.

[0063] In this embodiment, the connector 5 includes a plurality of screws 51.

[0064] Optionally, screw 51 is a dovetail screw.

[0065] Taking the connection between the inner steel plate 1 and the outer steel plate 2 as an example, both the inner steel plate 1 and the outer steel plate 2 are provided with multiple threaded holes for screws 51 to pass through. By screwing each screw 51 into the threaded holes on the inner steel plate 1 and the outer steel plate 2 in sequence, the inner steel plate 1 and the outer steel plate 2 are connected by threaded connection. Continuing with the example of the inner steel plate 1 being a hollow square body, multiple threaded holes are provided on the four side walls of the inner steel plate 1. The specific location of the threaded holes is not limited here, and can be referred to the attached figure for setting.

[0066] In this embodiment, the filler 4 includes either silicate-based foamed cement or magnesium-based foamed cement.

[0067] Silicate-based foamed cement and magnesium foamed cement can be injected into tank 9 to form a filling layer (also called a fireproof layer or heat insulation layer). Both have low thermal conductivity (lower than traditional foamed materials) and excellent heat insulation performance. Compared with the setting of air layer and vacuum layer, silicate-based foamed filling layer and magnesium foamed cement filling layer have better fire resistance.

[0068] Both silicate-based foamed cement and magnesium-based foamed cement are inorganic materials. Compared with filling the tank 9 with organic materials, filling with inorganic materials is more stable and helps to extend the service life of the duct.

[0069] For silicate-based foamed cement, the following supplementary information is provided: Animal-based cement foaming agents are used and pressurized with an air compressor to form foam with a certain tension. The foam is then mixed with 32.5R ordinary silicate cement slurry or slag silicate cement slurry. During the mixing process, the cement slurry continuously expands. When the expansion effect reaches the pre-set ratio, foamed cement is formed. This foamed cement is an aerated thermal insulation material. By forming closed foam pores inside the concrete, it makes the concrete lightweight and provides thermal insulation. The foam pores can act as closed air pores, and the non-flowing air inside the pores is an excellent thermal insulation medium that can cut off heat exchange.

[0070] Magnesium foamed cement is supplemented as follows: It is an air-hardening cementitious material mainly made of active magnesium oxide and corresponding salt solutions as basic raw materials, with the addition of filler and modifier materials, and prepared through processes such as mixing, molding, and curing.

[0071] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A prefabricated fireproof air duct, characterized in that: The system includes an inner steel plate (1), an outer steel plate (2), a sealing element (3), a filler (4), and a connector (5). The outer steel plate (2) is located outside the inner steel plate (1) and is connected to the inner steel plate (1) through the connector (5). The inner steel plate (1) and the outer steel plate (2) together form a groove (9) with a longitudinal cross-section in the shape of an annular or U-shape. The groove (9) has openings at both ends along the length of the duct. There are two sealing elements (3), which seal the openings at both ends respectively. At least one sealing element (3) is provided with a feed hole (6) and a discharge hole (7) corresponding to the filler (4). The filler (4) fills the groove (9) and is used for heat preservation, heat insulation, and fire prevention.

2. The prefabricated fireproof air duct according to claim 1, characterized in that: The filler (4) has several air storage holes.

3. The prefabricated fireproof air duct according to claim 1, characterized in that: Both of the aforementioned sealing components (3) are provided with the feed hole (6) and the discharge hole (7).

4. The prefabricated fireproof air duct according to claim 1, characterized in that: The sealing component (3) includes at least two U-shaped clips (31), each of which cooperates to seal the corresponding opening; the feed hole (6) and the discharge hole (7) are disposed on the same U-shaped clip (31) in the corresponding sealing component (3), or the feed hole (6) and the discharge hole (7) are disposed on different U-shaped clips (31) in the corresponding sealing component (3).

5. The prefabricated fireproof air duct according to claim 1, characterized in that: It also includes a flange (8), which is a single flange and is fitted on the outside of any one of the sealing elements (3), or the flange (8) is two flanges and the two flanges (8) are respectively fitted on the outside of the two sealing elements (3).

6. The prefabricated fireproof air duct according to claim 5, characterized in that: The flange (8) is connected to the inner steel plate (1) and the outer steel plate (2) through the connector (5), or the flange (8) is connected to the sealing member (3), the inner steel plate (1) and the outer steel plate (2) through the connector (5).

7. The prefabricated fireproof air duct according to any one of claims 1-6, characterized in that: The connector (5) includes a plurality of screws (51).

8. The prefabricated fireproof air duct according to any one of claims 1-6, characterized in that: The filler (4) includes either silicate-based foamed cement or magnesium-based foamed cement.

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