Double-sided thin steel plate fire-resistant composite air pipe

Abstract

The utility model discloses a double-sided thin steel plate fire-resistant composite air pipe which is characterized by comprising four pipe plates (1), four outer L-shaped clamping strips (2) and four inner L-shaped clamping strips (3), the four tube plates (1) are combined and spliced into a rectangular tube body; the four outer L-shaped clamping strips (2) are externally attached to the four external corners of the pipe body respectively. The four inner L-shaped clamping strips (3) are respectively and internally attached to internal corners of the pipe body; two sides of the outer L-shaped clamping strip (2) are fixedly connected with two sides of the inner L-shaped clamping strip (3) through two rows of primary and secondary rivets (4); the tube plate (1) comprises a thin steel plate inner layer (1-1), a fireproof plate middle layer (1-2) and a thin steel plate outer layer (1-3). The cable has the combined advantages of good fire resistance, higher strength, basically no increase in weight, difficulty in falling off in a vibration environment and the like.

Description

Technical Field

[0001] The utility model relates to a double-sided thin steel plate fire-resistant composite air duct. Background Art

[0002] The fire-resistant air duct commonly used in smoke and exhaust systems is made of four tube plates (i.e. plates with fire-resistant properties) spliced ​​and fixed together. Figure 1-2 It is an existing fire-resistant air duct for smoke and exhaust. Its four tube plates N are spliced ​​and fixed by direct self-tapping screws M, and its tube plate N is covered with a fireproof layer N-2 on the outside of an iron sheet N-1. Since the fireproof layer N-2 has a rough appearance, it is covered on the outside to achieve the purpose of fire resistance, fire prevention effect and beautiful appearance.

[0003] However, the self-tapping screws used between the adjacent two tube sheets N of the above-mentioned existing air ducts are subjected to unidirectional force, and the fixed connection is not firm enough and has insufficient strength, and is prone to loosening and falling off, especially in a vibrating environment. Especially when the nail holding performance of the fireproof layer N-2 material is insufficient, the effect is worse.

[0004] In addition, the inner wall of the fireproof layer N-2 of the air duct is very rough and easy to be attached, which is difficult to clean and will cause blockage. For example, when the grease (or unburned ash, etc.) on the inner wall accumulates thicker and thicker, the temperature in the pipe is too high, and it will burn and spread along the inner wall of the pipe when it encounters open flames or high temperatures, posing a serious safety hazard; and especially if it is not cleaned for a long time, it is very easy to accumulate and clog at the connection of two mutually perpendicular air ducts (i.e. the corner position). Utility Model Content

[0005] The utility model provides a double-sided thin steel plate fire-resistant composite air duct to solve the problems of the existing fire-resistant air duct for smoke prevention and exhaust, that the fixed connection between the tube plates is not firm, the tube plates are easy to loosen and fall off in a vibrating environment, and the inner wall of the tube is easy to be attached.

[0006] In order to achieve the above-mentioned purpose, the scheme of the utility model is: a double-sided thin steel plate fire-resistant composite air duct, characterized in that: it includes four tube sheets, four outer L-shaped clips and four inner L-shaped clips; the four tube sheets are combined to form a rectangular tube body; the four outer L-shaped clips are respectively attached to the four positive corners of the tube body; the four inner L-shaped clips are respectively attached to the negative corners of the tube body; the two sides of the outer L-shaped clips and the two sides of the inner L-shaped clips are fixedly connected by two rows of parent and child rivets; the tube sheet includes an inner layer of thin steel plate, a middle layer of fireproof plate and an outer layer of thin steel plate.

[0007] Preferably, the inner layer thickness of the thin steel plate is 0.2-0.5 mm; the outer layer thickness of the thin steel plate is 0.2-0.5 mm; and the middle layer thickness of the fireproof board is 5-12 mm.

[0008] Preferably, the outer L-shaped clip is made of stainless steel; or / and the inner L-shaped clip is made of stainless steel.

[0009] Preferably, the cross-sectional dimensions of the outer L-shaped clip strip are 30*30*1 mm.

[0010] Preferably, the cross-sectional dimensions of the inner L-shaped clip strip are 20*20*1 mm.

[0011] Furthermore, a reinforcing support is arranged in the tube body; the reinforcing support comprises two abutment plates and a support rod fixedly connected between the two abutment plates.

[0012] Preferably, the distribution spacing of each row of the mother-and-child rivets is 80-120 mm.

[0013] Furthermore, a connecting flange is fixedly provided at each end of the tube body.

[0014] Preferably, the connecting flange is formed by four angle steels being spliced ​​and welded in a rectangular shape.

[0015] Preferably, the middle layer of the fireproof board is made of magnesium silicate board, glass magnesium board or non-combustible inorganic composite board.

[0016] Beneficial effects of the utility model:

[0017] First, the tube plate of the utility model air duct is composed of a thin steel plate inner layer, a fireproof plate middle layer and a thin steel plate outer layer to form a double-sided thin steel plate to cover the inner and outer sides of the fireproof plate; compared with the traditional air duct ( Figure 1-2 ) is a single outer layer coated fireproof board, the utility model product (see Figure 3-5 ) has the advantages of higher strength, smoother inner wall appearance, and basically no increase in weight; at the same time, since the outer layer of the thin steel plate is used as the inner wall of the air duct, the inner wall surface is smooth, which can reduce adhesion, and is also easier to clean and not easy to cause blockage, especially avoiding the adhesion and accumulation of grease (or unburned ash, etc.), reducing safety hazards;

[0018] Second, in the utility model, the four outer L-shaped clips are respectively attached to the four positive corners of the tube body; the four inner L-shaped clips are respectively attached to the four negative corners of the tube body; the two sides of the four outer L-shaped clips and the two sides of the four inner L-shaped clips are fixedly connected by two rows of parent-child rivets to realize the combined clamping of the four tube sheet splicing ends, so that the installation and fixed connection between the tube sheets N are very firm and stable, which can greatly improve the overall strength, and the two adjacent tube sheets are fixedly restrained by double rows and double sides to prevent looseness and falling off during vibration; at the same time, the four inner L-shaped clips and the four outer L-shaped clips are covered inside and outside and extended along the double sides to seal, which can greatly improve the sealing performance and deformation resistance of the four tube sheet splicing points;

[0019] Third, the utility model replaces the existing self-tapping screws with the mother-and-child rivets, and the mother-and-child rivets have strong bearing capacity and shock resistance, and are anti-falling, can better resist the effect of external forces, reduce the risk of falling off, and ensure the stability of the connection;

[0020] Fourthly, since the air duct of the utility model is provided with a reinforcing support in the tube body, the reinforcing support can be adjusted by rotating the two butterfly nuts, so that the two washers are respectively pressed against the upper and lower tube plates of the air duct, which can further improve the strength and prevent deformation, and can also realize tightness adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The present invention is a schematic diagram of the structure of a fire-resistant air duct used for smoke prevention and exhaust in the prior art.

[0022] Figure 2 yes Figure 1 Enlarged view of point A in the middle.

[0023] Figure 3 It is a three-dimensional diagram of a double-sided thin steel plate fire-resistant composite air duct in Example 1 of the utility model.

[0024] Figure 4 yes Figure 3 Cross-sectional view of CC.

[0025] Figure 5 yes Figure 4 Enlarged view of point B in the middle.

[0026] Figure 6 It is a structural diagram of the tube sheet.

[0027] Figure 7 It is a structural diagram of the connecting flange.

[0028] Figure 8 It is a structural schematic diagram of the outer L-shaped card strip.

[0029] Fig. 9 It is a three-dimensional diagram of a double-sided thin steel plate fire-resistant composite air duct in the second embodiment of the utility model.

[0030] Fig.10 It is a cross-sectional view of a double-sided thin steel plate fire-resistant composite air duct in the second embodiment of the utility model. DETAILED DESCRIPTION

[0031] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0032] Example 1: See Figure 3-5 A double-sided thin steel plate fire-resistant composite air duct comprises four tube sheets 1, four outer L-shaped clips 2 and four inner L-shaped clips 3.

[0033] See also Figure 3 Specifically, the four tube sheets 1 are combined to form a rectangular tube body. Figure 5-6 The tube sheet 1 includes a thin steel plate inner layer 1-1, a fireproof plate middle layer 1-2 and a thin steel plate outer layer 1-3. The thin steel plate is defined as a steel plate with a thickness between 0.2 and 4 mm produced by hot rolling or cold rolling. In this embodiment, the thickness of the thin steel plate inner layer 1-1 is 0.2 mm; the thickness of the fireproof plate middle layer 1-2 is 8.8 mm; and the thickness of the thin steel plate outer layer 1-3 is 0.2 mm.

[0034] The fireproof board middle layer 1-2 meets the requirements of Class A fireproof grade, which is mainly determined according to the national standard GB50229 "Code for Fire Protection Design of Buildings". Class A fireproof grade can be further divided into Class A1 and Class A2. The fireproof grade of building materials is divided into Class A non-combustible type, Class B1 flame retardant type, Class B2 combustible type, also known as flame retardant type, and Class B3 flammable type.

[0035] Specifically, the middle layer 1-2 of the fireproof board is made of magnesium silicate board, glass magnesium board, magnesium crystal board, non-combustible inorganic composite board or other boards that meet Class A fireproof performance.

[0036] In this embodiment, preferably, the middle layer 1-2 of the fireproof board is made of magnesium silicate board.

[0037] Specifically, the cross-sectional dimensions (width*height) of the tube body are 500*1000 mm, and the length thereof is determined according to needs (eg, 1000-5000 mm).

[0038] See also Figure 5 Preferably, the outer L-shaped clip strip 2 is made of stainless steel; the inner L-shaped clip strip 3 is made of stainless steel. In this embodiment, the cross-sectional dimensions of the outer L-shaped clip strip 2 are 30*30*1mm (see Figure 8 ); the cross-sectional size of the inner L-shaped card strip 3 is 20*20*1mm.

[0039] During assembly, the four outer L-shaped clips 2 are respectively attached to the four positive corners of the tube body; the four inner L-shaped clips 3 are respectively attached to the four negative corners of the tube body; the two sides of the outer L-shaped clips 2 and the two sides of the inner L-shaped clips 3 are fixedly connected by two rows of mother-and-child rivets 4 to clamp the ends of two adjacent tube sheets 1. The distribution spacing h of each row of mother-and-child rivets 4 is 100mm. Specifically, the first side of the outer L-shaped clip 2, the first side of the inner L-shaped clip 3 and a tube sheet 1 clamped therebetween are fixedly connected by a row of mother-and-child rivets (4-1, 4-2). For details, see Figure 5The second side of the outer L-shaped clip 2, the second side of the inner L-shaped clip 3 and another tube sheet 1 clamped therebetween are fixedly connected by another row of rivets (4-1, 4-2).

[0040] See also Figure 7 Furthermore, a connection flange 6 is fixedly provided at each end of the tube body. Preferably, the connection flange 6 is formed by four angle steels 6-1 welded in a rectangular shape. A plurality of connection holes 6-1 are provided on the angle steel 6-1. In this way, the two air ducts are fixed together through two opposite connection flanges 6 by a plurality of bolts.

[0041] The manufacturing method of the product of this embodiment is as follows:

[0042] S10, making tube sheet:

[0043] Select 8.8mm fireproof board (fireproof board middle layer 1-2), first double-sided sanding, then the upper and lower surfaces of the fireproof board are laminated with 0.2mm thin steel plate using PUR hot melt adhesive (in other embodiments, other adhesives known in the art can also be used) to achieve three-layer composite bonding and fixation to form a tube sheet 1. At this time, the tube sheet has a thin steel plate inner layer 1-1, a fireproof board middle layer 1-2 and a thin steel plate outer layer 1-3;

[0044] S20, making connecting flange:

[0045] Select galvanized angle steel and cut it according to the size requirements, assemble four angle steels into a rectangle and weld them by carbon dioxide shielded welding to form a rectangular connecting flange, and then drill connecting holes on each angle steel;

[0046] S30, making the outer L-shaped card strip:

[0047] Use 1mm thick galvanized steel sheet and cut it according to the size requirements (its length matches the length of the air duct), then bend it into 90° (i.e. L-shaped angle) to obtain an outer L-shaped clip, the cross-sectional size of which is 1*30*30mm;

[0048] S40, making inner L-shaped card strip:

[0049] Use 1mm thick galvanized steel sheet and cut it according to the size requirements (its length matches the length of the air duct), then bend it into 90° (i.e. L-shaped angle) to obtain the inner L-shaped card strip, the size of which is 1*20*230mm;

[0050] S50, Select the mother-and-child rivets:

[0051] Standard stainless steel 4*10 rivets are used (they are standard parts purchased directly, so they are not described in detail).

[0052] S60, assembly and connection:

[0053] (1) Assemble four tube sheets, four inner L-shaped clips and four outer inner L-shaped clips and glue them together on the contact surfaces to form a rectangular tube body;

[0054] (2) Pre-drill rivet holes at the corresponding connection positions on both sides of each inner and outer card and on both sides of each outer and inner L-shaped card strip (see Figure 5 ), the corresponding positions on the ends of each tube sheet are also drilled. Since there are four corners, a total of 8 rows of rivet holes are required, and the spacing of each row of rivet holes can be 100mm (see Figure 3 );

[0055] (3) Installing rivets at each of the rivet holes and connecting and locking them;

[0056] (4) The two connecting flanges are respectively mounted on the two ends of the tube body and fixedly connected to the four ends of the tube sheet using a number of rivets;

[0057] (5) Fireproof glue is applied to the gaps between the four tube sheets, the four inner L-shaped clips, the four outer inner L-shaped clips and the two connecting flanges to ensure sealing.

[0058] This embodiment has the following characteristics and is analyzed as follows:

[0059] (1) Since the tube sheet 1 of the air duct of this embodiment is composed of a thin steel plate inner layer 1-1, a fireproof plate middle layer 1-2 and a thin steel plate outer layer 1-3, the double-sided thin steel plate covers the inner and outer sides of the fireproof plate, compared with the traditional air duct ( Figure 1-2 ) is a single outer layer coated fireproof board, the product of this embodiment ( Figure 3-5 ) has the advantages of higher strength, smoother inner wall appearance, and basically no increase in weight; at the same time, since the outer layer 1-3 of the thin steel plate is used as the inner wall of the air duct, the inner wall surface is smooth, which can reduce adhesion, and is also easier to clean and not easy to cause blockage, especially avoiding the adhesion and accumulation of grease (or unburned ash, etc.), reducing safety hazards;

[0060] (2) Since the four outer L-shaped clips 2 are respectively attached to the four positive corners of the tube body; the four inner L-shaped clips 3 are respectively attached to the four negative corners of the tube body; the two sides of the four outer L-shaped clips 2 and the two sides of the four inner L-shaped clips 3 are fixedly connected by two rows of rivets 4 to realize the combined clamping of the spliced ​​ends of the four tube sheets 1. In this way, the installation and fixed connection between the tube sheets N are very firm and stable, which can greatly improve the overall strength. The two adjacent tube sheets 1 are fixedly constrained by double rows and double sides to prevent looseness and falling off during vibration; at the same time, the four inner L-shaped clips 3 and the four outer L-shaped clips 2 are covered inside and outside and extended along the double sides to seal, which can greatly improve the sealing performance and anti-deformation strength of the four tube sheet splicing points;

[0061] (3) The utility model replaces the existing self-tapping screws with the mother-and-child rivets 4. The mother-and-child rivets 4 have strong bearing capacity and shock resistance, and are anti-falling, which can better resist the action of external forces, reduce the risk of falling off, and ensure the stability of the connection.

[0062] Embodiment 2: This embodiment is basically the same as Embodiment 1, except that:

[0063] See also Figure 9-10 , a reinforcing support 5 is provided in the tube body. The reinforcing support 5 comprises a supporting screw 5-1, two washers 5-2 and two butterfly nuts 5-3. The two washers 5-2 and the two butterfly nuts 5-3 are respectively mounted on the two ends of the supporting screw 5-1; the two washers 5-2 are respectively located on the outside of the two butterfly nuts 5-3. The two washers 5-2 can be adjusted by rotating the two butterfly nuts 5-3, so that the two washers 5-2 can be respectively pressed against the upper and lower tube plates 1 of the air duct, which can improve the strength, prevent deformation, and realize the tightness adjustment.

[0064] Specifically, the support screw rod is an external threaded rod made of a Φ10 galvanized rod, and the butterfly nut 5-3 is an M10 butterfly nut.

[0065] The preferred specific embodiments of the utility model are described in detail above. It should be understood that ordinary technicians in this field can make many modifications and changes based on the concept of the utility model without creative work. Therefore, all technical solutions that can be obtained by technicians in this technical field based on the concept of the utility model through logical analysis, reasoning or limited experiments on the basis of the existing technology should be within the scope of protection determined by the claims.

Claims

1. A double-sided thin steel plate fire-resistant composite air duct, characterized in that: It comprises four tube sheets (1), four outer L-shaped clips (2) and four inner L-shaped clips (3); The four tube sheets (1) are assembled into a rectangular tube body; the four outer L-shaped clips (2) are respectively attached to the four outer corners of the tube body; the four inner L-shaped clips (3) are respectively attached to the inner corners of the tube body; the two sides of the outer L-shaped clips (2) and the two sides of the inner L-shaped clips (3) are fixedly connected by two rows of rivets (4-1, 4-2); The tube sheet (1) comprises a thin steel plate inner layer (1-1), a fireproof plate middle layer (1-2) and a thin steel plate outer layer (1-3).

2. A double-sided thin steel plate fire-resistant composite air duct as claimed in claim 1, characterized in that: The thickness of the inner layer (1-1) of the thin steel plate is 0.2-0.5 mm; The thickness of the outer layer (1-3) of the thin steel plate is 0.2-0.5 mm; The thickness of the middle layer (1-2) of the fireproof board is 5-12 mm.

3. The double-sided thin steel plate fire-resistant composite air duct according to claim 1, characterized in that: The outer L-shaped clip (2) is made of stainless steel; Or / and the inner L-shaped clip (3) is made of stainless steel.

4. A double-sided thin steel plate fire-resistant composite air duct as claimed in claim 1 or 3, characterized in that: The cross-sectional dimensions of the outer L-shaped clip (2) are 30*30*1 mm.

5. A double-sided thin steel plate fire-resistant composite air duct as claimed in claim 1 or 3, characterized in that: The cross-sectional dimensions of the inner L-shaped clip (3) are 20*20*1 mm.

6. The double-sided thin steel plate fire-resistant composite air duct according to claim 1, characterized in that: A reinforcing support (5) is provided in the tube body; The reinforcing support (5) comprises two abutment plates (5-1) and a support rod (5-2) fixedly connected between the two abutment plates (5-1).

7. The double-sided thin steel plate fire-resistant composite air duct according to claim 1, characterized in that: The distribution spacing of each row of the mother-and-child rivets (4) is 80-120 mm.

8. The double-sided thin steel plate fire-resistant composite air duct according to claim 1, characterized in that: A connecting flange (6) is fixedly provided at each end of the tube body.

9. The double-sided thin steel plate fire-resistant composite air duct according to claim 8, characterized in that: The connecting flange (6) is formed by welding four angle steels (6-1) in a rectangular shape.

10. A double-sided thin steel plate fire-resistant composite air duct according to any one of claims 1 to 3, characterized in that: The middle layer (1-2) of the fireproof board is made of magnesium silicate board, glass magnesium board or non-combustible inorganic composite board.

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