A fireproof sealing device for the reserved opening of through-wall electrical conduit in the substation power distribution room

Abstract

This utility model discloses a fireproof sealing device for reserved openings of through-wall electrical bushings in a substation power distribution room, comprising a flexible fireproof sealing layer, an intumescent fireproof layer, a fireproof sealing reinforcement layer, and metal restraints. The metal restraints are used to fix the electrical bushings to the opening in the wall. The flexible fireproof sealing layer is tightly attached to the outer wall of the electrical bushing. The intumescent fireproof layer is wrapped around the flexible fireproof sealing layer. The fireproof sealing reinforcement layer is set as a rigid support around the intumescent fireproof layer. The fireproof sealing device for reserved openings of through-wall electrical bushings in a substation power distribution room provided by this utility model is highly feasible. It solves the problems of poor sealing performance and short fire resistance time of traditional processes by providing a layered composite fireproof sealing structure and through the synergistic effect of the flexible sealing layer, the intumescent flame-retardant layer, and the fireproof sealing reinforcement layer as a rigid support.

Description

Technical Field

[0001] This utility model relates to the field of fire protection technology for power facilities, and in particular to a fireproof sealing device for the reserved opening of the through-wall electrical bushing in the substation power distribution room, which is used to improve the fire resistance and sealing performance of the gap between the through-wall bushing and the wall. Background Technology

[0002] When the fire separation distance between the substation power distribution room building and the oil-containing electrical equipment does not meet the requirements, the common solution is to construct a firewall on the exterior wall of the building closest to the oil-containing electrical equipment to ensure that the fire separation distance between the two meets the code requirements. No doors, windows, or openings should be made in the firewall. If openings are necessary, they should be Class A fire doors and windows that cannot be opened or can automatically close in case of fire. Traditional methods for sealing electrical conduit openings in firewalls often involve filling with fireproof boards, fireproof sealant, or fireproof bags. However, these methods have drawbacks. For example, fireproof sealant is prone to aging and cracking, resulting in poor long-term stability. Single-layer fireproof boards cannot adapt to thermal expansion and contraction and are prone to detaching from the conduit, creating gaps. Multi-layer materials lack structural support, resulting in insufficient seismic resistance and fire resistance (usually less than 2 hours). In case of fire, high-temperature smoke can easily diffuse through these gaps, leading to the spread of the fire.

[0003] Therefore, there is an urgent need for a sealing structure that combines high fire resistance, structural stability, and convenient construction. Utility Model Content

[0004] The purpose of this utility model is to solve the problems of the prior art and provide a fireproof sealing device for the reserved opening of the through-wall electrical bushing in the substation power distribution room.

[0005] The objective of this utility model is achieved through the following technical solution: a fireproof sealing device for a pre-reserved opening of an electrical conduit penetrating a wall in a substation power distribution room, comprising a flexible fireproof sealing layer, an intumescent fireproof layer, a fireproof sealing reinforcement layer, and a metal restraint; the metal restraint is used to fix the electrical conduit at the opening in the wall; the flexible fireproof sealing layer is tightly attached to the outer wall of the electrical conduit; the intumescent fireproof layer is wrapped around the flexible fireproof sealing layer; the fireproof sealing reinforcement layer is set as a rigid support around the intumescent fireproof layer; The flexible fireproof sealing layer is a high-temperature resistant silicone fireproof sealant; the flexible fireproof sealing layer uses high-temperature resistant silicone fireproof sealant to fill the gap between the sleeve and the wall and form an initial airtightness; The intumescent fireproof layer is graphite-containing intumescent fireproof mortar; the graphite-containing intumescent fireproof mortar expands 3-5 times in volume when heated, has a density of ≤1.2g / cm³ at room temperature, and an expansion rate of ≥300% at 800℃, sealing thermal deformation gaps; preferably, the intumescent fireproof mortar also contains ceramic fibers (accounting for 10% to 20%) to improve crack resistance. The fireproof sealing and reinforcement layer includes a magnesium fireproof board, a galvanized angle steel frame, and a steel plate. The magnesium fireproof board is installed on the outdoor side and fixedly embedded in the galvanized angle steel frame. The steel plate is installed on the indoor side. An insulation layer is filled between the magnesium fireproof board and the steel plate. The galvanized angle steel frame and the steel plate provide rigid support, while the magnesium fireproof board and the insulation layer provide fireproofing and heat insulation, thus providing both fireproofing and reinforcement. A groove is pre-embedded inside the wall opening, and fireproof adhesive is used for secondary sealing after embedding. The magnesium fireproof board is a double-layered, staggered magnesium fireproof board, and the coated side of the magnesium fireproof board faces the outdoors; the insulation layer is a rock wool fireproof board. The metal constraint includes an annular fixing flange and prestressed anchor bolts; the gap between the inner diameter of the annular fixing flange and the electrical bushing is ≤2mm; the outer edge of the annular fixing flange is anchored to the wall by prestressed anchor bolts; the galvanized angle steel frame is welded to the outer edge of the flange; the metal constraint facilitates fixing the electrical bushing and also facilitates the installation of the galvanized angle steel frame. A high-temperature resistant ceramic gasket is installed between the galvanized angle steel frame and the magnesium fireproof board; the high-temperature resistant ceramic gasket can prevent the metal from conducting heat and damaging the fireproof board.

[0006] A further technical solution includes an annular inorganic fireproof and heat-insulating layer along the length of the electrical conduit; the annular inorganic fireproof and heat-insulating layer includes a rock wool board and an aluminum-magnesium-manganese metal plate covering the rock wool board; the annular inorganic fireproof and heat-insulating layer is fixed by metal clamps and bolts; an external wall insulation and decorative layer is also provided on the outdoor side of the wall.

[0007] The working process of this utility model is as follows: Step 1, Construction Preparation: Measure the sleeve diameter D and machine an annular flange with an inner diameter of D+4mm; Step 2, Base treatment: Clean up debris at the opening and chisel a 10mm deep groove on both sides of the wall; Step 3: Install metal restraints: Fit the flange into the sleeve and tighten the prestressed anchor bolts (spacing ≤ 200mm), and weld the angle steel frame to the outer edge of the flange; Step 4, Layered filling: Inject the high-temperature resistant silicone fireproof sealant (8mm thick) of the flexible fireproof sealing layer in sequence, then inject the expanded fireproof mortar (30mm thick) of the compacted expanded fireproof layer, and finally embed magnesium fireproof board, steel plate, and rock wool fireproof board into the galvanized angle steel frame and seal with glue. Step 5, Acceptance Testing: Use a flue gas permeameter to test the air tightness (leakage < 0.1 m³ / h when the pressure difference is 50 Pa).

[0008] This utility model has the following advantages: 1. The fireproof sealing device for the pre-reserved opening of the wall-penetrating electrical bushing in the substation power distribution room provided by this utility model is highly feasible. That is, by providing a layered composite fireproof sealing structure, the problem of poor sealing and short fire resistance time of traditional processes is solved through the synergistic effect of the flexible sealing layer, the expansion flame retardant layer and the fireproof sealing reinforcement layer as rigid support.

[0009] 2. Enhanced fire resistance limit: Through triple protection of "flexible sealing + expansion filling + rigid barrier", the fire resistance time reaches 3 hours (GB / T 9978.1 test).

[0010] 3. Seismic performance optimization: Metal restraints form mechanical constraints, which can resist structural displacement under a magnitude 7 earthquake.

[0011] 4. Improved construction efficiency: This utility model adopts modular components, which shortens the installation time by 40% compared with the traditional process.

[0012] 5. Long life cycle: The material has enhanced weather resistance, and the maintenance-free period is more than 10 years. Attached Figure Description

[0013] Figure 1 This is a structural schematic diagram from one perspective of the present invention.

[0014] Figure 2 This is a structural schematic diagram of the present invention from another perspective.

[0015] In the diagram: 1. Electrical conduit; 2. Wall; 3. Fireproof sealing and reinforcement layer; 31. Magnesium fireproof board; 32. Insulation layer; 33. Steel plate; 34. Galvanized angle steel frame; 4. Intumescent fireproof layer; 5. Flexible fireproof sealing layer; 6. Embedded parts; 7. Annular inorganic material fireproof and heat insulation layer; 8. Exterior wall insulation and decoration layer; A. Outdoor side; B. Indoor side. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0017] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0018] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0019] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0020] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used 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. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0021] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] Example 1: As Figure 1 and 2 As shown, a fireproof sealing device for the reserved opening of the through-wall electrical bushing in the substation power distribution room includes a flexible fireproof sealing layer 5, an intumescent fireproof layer 4, a fireproof sealing reinforcement layer 3, and metal restraints. The metal restraints are used to fix the electrical bushing 1 to the opening in the wall 2. The flexible fireproof sealing layer 5 is tightly attached to the outer wall of the electrical bushing 1. The intumescent fireproof layer 4 is wrapped around the flexible fireproof sealing layer 5. The fireproof sealing reinforcement layer 3 is set as a rigid support around the intumescent fireproof layer 4. The flexible fireproof sealing layer 5 is a high-temperature resistant silicone fireproof sealant; the flexible fireproof sealing layer 5 uses a high-temperature resistant silicone fireproof sealant to fill the gap between the sleeve and the wall 2 and form an initial airtightness; The intumescent fireproof layer 4 is an intumescent fireproof mortar containing graphite; the intumescent fireproof mortar containing graphite expands 3-5 times in volume when heated, has a density of ≤1.2g / cm³ at room temperature, and an expansion rate of ≥300% at 800℃, sealing thermal deformation gaps; preferably, the intumescent fireproof mortar also contains ceramic fibers (accounting for 10% to 20%) to improve crack resistance. The fireproof sealing and reinforcement layer 3 includes a magnesium fireproof board 31, a galvanized angle steel frame 34, and a steel plate 33. The magnesium fireproof board 31 is installed on the outdoor side and fixedly embedded in the galvanized angle steel frame 34. The steel plate is installed on the indoor side. An insulation layer 32 is filled between the magnesium fireproof board 31 and the steel plate 33. The galvanized angle steel frame 34 and the steel plate 33 provide rigid support, while the magnesium fireproof board 31 and the insulation layer 32 provide fireproof and heat insulation, thus playing a combined role in fireproofing and reinforcement. A groove is pre-set inside the opening of the wall 2, and a pre-embedded part 6 is also provided in the groove for welding the galvanized angle steel frame 34. After being embedded, it is sealed twice with fireproof glue. The magnesium fireproof board 31 is a double-layered staggered magnesium fireproof board 31, and the magnesium fireproof board 31 has a single-sided external coating facing the outdoor side; the insulation layer 32 is a rock wool fireproof board. The metal constraint includes an annular fixing flange and prestressed anchor bolts; the gap between the inner diameter of the annular fixing flange and the electrical sleeve 1 is ≤2mm; the outer edge of the annular fixing flange is anchored to the wall 2 by prestressed anchor bolts; the galvanized angle steel frame 34 is welded to the outer edge of the flange; the metal constraint is beneficial for fixing the electrical sleeve 1 and also facilitates the installation of the galvanized angle steel frame 34. A high-temperature resistant ceramic gasket is provided between the galvanized angle steel frame 34 and the magnesium fireproof board 31; the high-temperature resistant ceramic gasket can prevent the metal from conducting heat and damaging the fireproof board.

[0023] A further technical solution includes an annular inorganic fireproof and heat-insulating layer 7 arranged along the length of the electrical conduit 1; the annular inorganic fireproof and heat-insulating layer 7 includes a rock wool board and an aluminum-magnesium-manganese metal plate covering the rock wool board; the annular inorganic fireproof and heat-insulating layer 7 is fixed by metal clamps and bolts; an external wall insulation and decorative layer 8 is also provided on the outdoor side of the wall 2.

[0024] The working process of this utility model is as follows: Step 1, Construction Preparation: Measure the sleeve diameter D and machine an annular flange with an inner diameter of D+4mm; Step 2, Base treatment: Clean up debris at the opening, and chisel grooves with a depth of 10mm on both sides of wall 2; Step 3: Install metal restraints: Fit the flange into the sleeve and tighten the prestressed anchor bolts (spacing ≤ 200mm), and weld the angle steel frame to the outer edge of the flange; Step 4, layered filling: inject the high-temperature resistant silicone fireproof sealant (8mm thick) of the flexible fireproof sealing layer 5 in sequence, and the expanded fireproof mortar (30mm thick) of the compacted expanded fireproof layer 4 in sequence. Finally, embed the magnesium fireproof board 31, steel plate 33, and rock wool fireproof board into the galvanized angle steel frame 34 and seal them with glue. Step 5, Acceptance Testing: Use a flue gas permeameter to test the air tightness (leakage < 0.1 m³ / h when the pressure difference is 50 Pa).

[0025] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A fireproof sealing device for the reserved opening of through-wall electrical bushings in the power distribution room of a substation, characterized in that: It includes a flexible fireproof sealing layer, an intumescent fireproof layer, a fireproof sealing and reinforcement layer, and metal restraints; the metal restraints are used to fix the electrical conduit to the opening in the wall; the flexible fireproof sealing layer is closely attached to the outer wall of the electrical conduit; the intumescent fireproof layer is wrapped around the flexible fireproof sealing layer; the fireproof sealing and reinforcement layer is set as a rigid support around the intumescent fireproof layer.

2. The fireproof plugging device for the reserved hole of the wall bushing of the substation switchgear room according to claim 1, characterized in that: The flexible fireproof sealing layer is a high-temperature resistant silicone fireproof sealant.

3. The fireproof plugging device for the reserved hole of the wall bushing of the substation switchgear room according to claim 1, characterized in that: The intumescent fireproof layer is an intumescent fireproof mortar containing graphite.

4. The fireproof plugging device for the reserved hole of the wall bushing of the substation switchgear room according to claim 1, characterized in that: The fireproof sealing and reinforcement layer includes a magnesium fireproof board, a galvanized angle steel frame, and a steel plate; the magnesium fireproof board is installed on the outdoor side and fixedly embedded in the galvanized angle steel frame; the steel plate is installed on the indoor side; and an insulation layer is filled between the magnesium fireproof board and the steel plate.

5. The fireproof plugging device for the reserved hole of the wall bushing of the substation switchgear room according to claim 4, characterized in that: The magnesium fireproof board is a double-layered, staggered-joint magnesium fireproof board, and the coated side of the magnesium fireproof board faces the outdoors; the insulation layer is a rock wool fireproof board.

6. The fireproof plugging device for the reserved hole of the wall bushing of the substation switchgear room according to claim 4, characterized in that: The metal constraint components include an annular fixed flange and prestressed anchor bolts; the gap between the inner diameter of the annular fixed flange and the electrical conduit is ≤2mm; the outer edge of the annular fixed flange is anchored to the wall by prestressed anchor bolts; the galvanized angle steel frame is welded to the outer edge of the flange.

7. The fireproof plugging device for the reserved hole of the wall bushing of the substation switchgear room according to claim 6, characterized in that: A high-temperature resistant ceramic gasket is installed between the galvanized angle steel frame and the magnesium fireproof board.

8. The fireproof sealing device for the reserved opening of the through-wall electrical bushing in the substation power distribution room according to claim 1, characterized in that: It also includes an annular inorganic material fireproof and heat-insulating layer disposed along the length of the electrical conduit; the annular inorganic material fireproof and heat-insulating layer includes a rock wool board and an aluminum-magnesium-manganese metal plate covering the rock wool board; the annular inorganic material fireproof and heat-insulating layer is fixed by metal clamps and bolts.

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