Core plate structure of heat-insulation fireproof door

Abstract

The utility model relates to the technical field of fireproof door core plates, in particular to a heat insulation fireproof door core plate structure which comprises a door plate, and the door plate comprises a fireproof surface layer, a heat insulation layer and a heat insulation layer which are sequentially arranged from outside to inside, the composite heat insulation layer comprises a flame-retardant modified honeycomb ceramic frame, nano aerogel particles filled in honeycomb holes of the flame-retardant modified honeycomb ceramic frame, and a silicon dioxide reflecting film covering the surfaces of the nano aerogel particles; the impact-resistant supporting layer is a grid framework formed by welding a plurality of transverse stainless steel reinforcing ribs and longitudinal stainless steel reinforcing ribs in a crossed mode, and a flame-retardant polyurethane foaming layer is poured into grids of the grid framework; the fireproof surface layer, the composite heat insulation layer and the impact-resistant supporting layer are bonded through a high-temperature-resistant inorganic adhesive, and heat insulation covered edges are arranged on the four edges of the door plate. According to the utility model, the shock resistance and the heat insulation performance of the back-to-fire surface of the fireproof door are improved.

Description

Technical Field

[0001] This utility model relates to the field of fireproof door core board technology, and more specifically to a heat-insulating fireproof door core board structure. Background Technology

[0002] Fire doors are an important component of building fire safety, and their core performance depends on the structural design and material selection of the door core panel. Existing fire door core panels typically employ a multi-layer composite structure to balance fire resistance, heat insulation, and strength.

[0003] However, traditional door core panels have the following shortcomings in practical applications: the thermal insulation materials of some door core panels (such as ordinary rock wool and perlite boards) have a high thermal conductivity, and heat can easily penetrate at high temperatures, causing the temperature of the fire door's unexposed surface to rise rapidly, making it difficult to meet the long-term fireproof and heat insulation requirements; the multiple layers of materials are connected by adhesives, and the adhesives are prone to failure in high-temperature environments, leading to interlayer peeling and cracking, affecting the overall structural strength; at the same time, existing door core panels have weak impact resistance and are easily damaged when subjected to external impacts. Utility Model Content

[0004] The purpose of this utility model is to provide a heat-insulating fireproof door core panel structure to improve impact resistance and heat insulation performance of the fireproof door's back surface.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] A heat-insulating and fireproof door core panel structure includes a door panel, wherein the door panel comprises, from the outside to the inside, the following components arranged sequentially:

[0007] Fireproof surface layer: composed of calcium silicate board covered with basalt fiber cloth on both sides;

[0008] Composite thermal insulation layer: includes a flame-retardant modified honeycomb ceramic frame, nano-aerogel particles filled in the honeycomb pores of the flame-retardant modified honeycomb ceramic frame, and a silica reflective film covering the surface of the nano-aerogel particles.

[0009] Impact-resistant support layer: a grid skeleton formed by cross-welding multiple transverse stainless steel reinforcing ribs and longitudinal stainless steel reinforcing ribs, wherein the grid skeleton is filled with a flame-retardant polyurethane foam layer.

[0010] The fireproof surface layer, composite heat insulation layer and impact-resistant support layer are bonded together with a high-temperature resistant inorganic adhesive, and the door panel has heat-insulating edging on all four sides.

[0011] Furthermore, the surface of the flame-retardant modified honeycomb ceramic frame is coated with a zinc borate flame retardant coating.

[0012] Furthermore, the high-temperature resistant inorganic adhesive is a silicate-based fire-resistant adhesive.

[0013] Furthermore, the heat insulation edging includes a front metal edging layer and a rear metal edging layer respectively disposed on both sides of the door panel, and a heat insulation thermal break layer is provided between the front metal edging layer and the rear metal edging layer.

[0014] Furthermore, the thermal break layer is installed and connected to the front metal edging layer and the rear metal edging layer by means of a snap-fit ​​connection.

[0015] Furthermore, the thermal insulation layer is a ceramic fiber frame.

[0016] Furthermore, heat insulation pads are provided between the front and rear metal edging layers and the door panel.

[0017] Furthermore, the heat insulation pad is a silica aerogel sheet.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] The fireproof surface layer of this invention uses basalt fiber cloth reinforced calcium silicate board to resist flame impact and provide basic fire protection; the composite heat insulation layer combines flame-retardant modified honeycomb ceramic frame, nano aerogel particles and silica reflective film to form a three-dimensional heat insulation system of "heat resistance convection - low thermal conductivity - reflected heat radiation", which significantly delays the transfer of heat to the unexposed side and solves the problem of high thermal conductivity of traditional heat insulation layers; the impact-resistant support layer is composed of stainless steel reinforcing mesh and flame-retardant polyurethane foam layer. The stainless steel mesh provides rigid support, and the foam layer absorbs impact energy. The combination of the two improves the door core panel's resistance to external impact and improves the defect of traditional door core panels being easily damaged. Attached Figure Description

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

[0021] Figure 2 This is a schematic diagram of the structure of the door panel of this utility model;

[0022] Figure 3 This is a partial structural diagram of the present invention. Figure 1 ;

[0023] Figure 4 This is a partial structural diagram of the present invention. Figure 2 .

[0024] 1. Door panel; 11. Fireproof surface layer; 111. Calcium silicate board; 112. Basalt fiber cloth; 12. Composite insulation layer; 121. Flame-retardant modified honeycomb ceramic frame; 122. Nano aerogel particles; 13. Impact-resistant support layer; 131. Horizontal stainless steel reinforcing ribs; 132. Vertical stainless steel reinforcing ribs; 133. Flame-retardant polyurethane foam layer; 2. Insulation edging; 21. Front metal edging layer; 22. Thermal break layer; 23. Rear metal edging layer. Detailed Implementation

[0025] like Figures 1 to 4 As shown, a heat-insulating and fireproof door core panel structure includes a door panel 1, wherein the door panel 1 comprises, from the outside to the inside, the following components arranged sequentially:

[0026] Fireproof surface layer 11: Composed of calcium silicate board 111 covered with basalt fiber cloth 112 on both sides;

[0027] Composite heat insulation layer 12: includes flame-retardant modified honeycomb ceramic frame 121, nano aerogel particles 122 filled in the honeycomb pores of the flame-retardant modified honeycomb ceramic frame 121, and a silica reflective film covering the surface of the nano aerogel particles 122.

[0028] Impact-resistant support layer 13: a grid skeleton formed by cross-welding multiple transverse stainless steel reinforcing ribs 131 and longitudinal stainless steel reinforcing ribs 132, wherein a flame-retardant polyurethane foam layer 133 is injected into the grid of the grid skeleton.

[0029] The fireproof surface layer 11, the composite heat insulation layer and the impact-resistant support layer 13 are bonded together with a high-temperature resistant inorganic adhesive, and the door panel 1 has heat insulation edging 2 on all four sides.

[0030] The surface of the flame-retardant modified honeycomb ceramic frame 121 is coated with a zinc borate flame retardant coating; the zinc borate flame retardant coating forms a heat insulation protective layer at high temperature, inhibiting the thermal decomposition of the honeycomb ceramic frame 121 and improving the fire resistance of the composite heat insulation layer 12.

[0031] The high-temperature resistant inorganic adhesive is a silicate-based fire-resistant adhesive; silicate-based adhesives have excellent high-temperature resistance, avoiding bonding failure at high temperatures, ensuring that the interlayer bond remains stable in a fire environment, and preventing delamination and cracking.

[0032] The heat insulation edging 2 includes a front metal edging layer 21 and a rear metal edging layer 23 respectively disposed on both sides of the door panel 1. A heat insulation break layer 22 is provided between the front metal edging layer 21 and the rear metal edging layer 23. Through the composite structure of "front metal edging layer 21-heat insulation break layer 22-rear metal edging layer 23", the heat conduction path of the metal edging is blocked, and the temperature rise rate of the unexposed surface is reduced.

[0033] The thermal break layer 22 is installed and connected to the front metal edging layer 21 and the rear metal edging layer 23 by means of a snap-fit ​​connection; the mechanical snap-fit ​​connection method improves the connection strength between the thermal break layer 22 and the metal edging layer, facilitates installation and avoids the risk of adhesive failure.

[0034] The thermal break layer 22 is a ceramic fiber frame; the ceramic fiber frame has both high temperature resistance and low thermal conductivity, effectively blocking heat transfer through the thermal insulation edge 2.

[0035] A heat insulation pad is provided between the front metal edging layer 21 and the rear metal edging layer 23 and the door panel 1; the heat insulation pad is a silica aerogel sheet; the heat insulation pad is provided in the contact area between the front metal edging layer 21 and the rear metal edging layer 23 and the door panel 1 to further reduce contact heat conduction, and form a double heat insulation barrier with the heat insulation break layer 22.

[0036] Fireproof and heat insulation principle:

[0037] The fireproof surface layer 11 is made of calcium silicate board 111 (temperature resistance ≥1000℃) and basalt fiber cloth 112 to resist the direct impact of flames and delay the penetration of flames.

[0038] The composite insulation layer 12 hinders the flow of hot air through the porous structure of the honeycomb ceramic frame 121, and the nano aerogel particles 122 further reduce the thermal conductivity after filling. The silica reflective film reflects thermal radiation, and the three work together to block heat transfer.

[0039] The heat insulation edging 2 cuts off the heat conduction path of the metal edging through the heat insulation break layer 22 and the heat insulation gasket, so as to prevent the heat on the flame side from being conducted to the unexposed side through the edging.

[0040] Structural strengthening principle:

[0041] Stainless steel reinforcing mesh provides a rigid support frame for door panel 1, and flame-retardant polyurethane foam layer 133 fills the mesh gaps to absorb impact energy and improve impact resistance.

[0042] High-temperature resistant inorganic adhesives enhance interlayer bonding and prevent delamination at high temperatures.

[0043] This invention addresses the insufficient heat insulation of traditional door core panels by significantly improving the heat insulation performance of the fireproof door's unexposed surface through the design of a composite heat insulation layer 12 and a heat insulation edging 2, thus meeting long-term fire protection requirements. To address interlayer delamination and weak impact resistance, a high-temperature resistant adhesive and a rigid-flexible support structure are used to enhance structural stability and resistance to external forces at high temperatures. Finally, to address the thermal bridging problem of the metal edging, a segmented heat insulation edging structure is used to block the heat transfer path.

[0044] When connecting and installing the heat insulation edging 2 to the door panel 1, point contact riveting is used. The front metal edging layer 21 and the rear metal edging layer 23 are fixed to the edge of the door panel 1 by rivets that are spaced apart. The rivets are covered with ceramic heat insulation sleeves to reduce heat conduction through surface contact between the metal edging and the door panel 1.

[0045] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A heat-insulating and fireproof door core panel structure, characterized in that: Includes a door panel (1), which comprises, from the outside to the inside, the following components arranged sequentially: Fireproof surface layer (11): composed of calcium silicate board (111) covered with basalt fiber cloth (112) on both sides; Composite heat insulation layer (12): includes flame-retardant modified honeycomb ceramic frame (121), nano aerogel particles (122) filled in the honeycomb pores of the flame-retardant modified honeycomb ceramic frame (121), and a silica reflective film covering the surface of the nano aerogel particles (122). Impact-resistant support layer (13): a grid skeleton formed by cross-welding of multiple transverse stainless steel reinforcing ribs (131) and longitudinal stainless steel reinforcing ribs (132), wherein the grid skeleton is filled with a flame-retardant polyurethane foam layer (133). The fireproof surface layer (11), composite heat insulation layer and impact-resistant support layer (13) are bonded together by high-temperature resistant inorganic adhesive, and the door panel (1) is provided with heat insulation edging (2) on all four sides.

2. The thermally insulated fire door core panel structure of claim 1, wherein: The flame-retardant modified honeycomb ceramic frame (121) is coated with a zinc borate flame retardant coating.

3. The thermally insulated fire door core panel structure of claim 1, wherein: The high-temperature resistant inorganic adhesive is a silicate-based fire-resistant adhesive.

4. The thermally insulated fire door core panel structure of claim 1, wherein: The heat insulation edging (2) includes a front metal edging layer (21) and a rear metal edging layer (23) respectively disposed on both sides of the door panel (1), and a heat insulation thermal break layer (22) is provided between the front metal edging layer (21) and the rear metal edging layer (23).

5. The thermally insulated fire door core panel structure of claim 4, wherein: The thermal break layer (22) is installed and connected to the front metal edging layer (21) and the rear metal edging layer (23) by means of a snap-fit.

6. The thermally insulated fire door core panel structure of claim 4, wherein: The thermal break layer (22) is a ceramic fiber frame.

7. The thermally insulated fire door core panel structure of claim 4, wherein: A heat insulation pad is provided between the front metal edging layer (21) and the rear metal edging layer (23) and the door panel (1).

8. The thermally insulated fire door core panel structure of claim 7, wherein: The heat insulation pad is a silica aerogel sheet.

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