Micro-positive-pressure explosion-proof cable bridge

Abstract

The utility model discloses a micro-positive-pressure explosion-proof cable bridge which comprises a bridge groove body, a bridge cover plate and a positive-pressure gas pipeline, and has the beneficial effects that a cable in the cable bridge can be effectively and fully isolated from the external environment; the cable bridge is simple in structure and convenient to use, prevents explosive or inflammable substances from entering the cable bridge when escaping outwards due to poor sealing of equipment and pipelines, is high in safety performance, cannot cause fire or explosion accidents due to fire striking such as cable overload heating and mechanical damage, is simple and convenient to construct and maintain, and can be widely applied to gas and dust working condition environments such as chemical engineering, coal mines and metallurgy.

Description

Technical Field

[0001] The utility model belongs to the field of electrical engineering and relates to a cable bridge, in particular to a micro-positive pressure flameproof cable bridge. Background Art

[0002] In the operating environment of chemical, coal mining, energy and other industries, explosive or flammable substances may escape from equipment and pipelines due to poor sealing, and sparks may be formed when encountering electrical short circuits, which may cause explosions or combustion. In order to prevent accidents, instruments and electrical equipment in these environments are all explosion-proof. However, there is no technical application of explosion-proof cable trays in the prior art, resulting in no explosion-proof measures when cables in the cable trays catch fire due to factors such as overload and mechanical trauma. Moreover, although traditional cable trays are not sealed enough, the air circulation is not strong, which often leads to the accumulation of explosive or flammable substances, which is very unfavorable to safety. Summary of the invention

[0003] In view of the shortcomings of the above-mentioned existing cable tray technology, the utility model discloses a micro-positive pressure explosion-proof cable tray, which can effectively isolate the cables in the cable tray from the external environment and prevent explosive or flammable substances from escaping into the cable tray due to poor sealing of equipment and pipelines. In order to achieve the above-mentioned technical purpose, the utility model adopts the following technical solutions:

[0004] A slightly positive pressure flameproof cable tray, comprising a tray trough, a tray cover, and a positive pressure gas pipeline, characterized in that: the tray trough opens upward, positive pressure gas pipelines are longitudinally fixed at the bottom corners on both sides of the tray, and the tray cover is installed above the tray trough;

[0005] A flame retardant sealing strip is provided at the connection between the opening above the bridge trough body and the bridge cover plate; a sealing plate is provided at both ends of the bridge trough body, and the sealing plate is divided into an upper and a lower piece, and the upper and lower sealing plates are respectively provided with semicircular holes, and the two semicircular holes are connected to form a cable hole, and a flame retardant silicone sealing ring is installed on the cable hole;

[0006] A pressure sensor is also provided on the inner wall of the bridge slot body.

[0007] Two or more screw holes are respectively arranged on the top edges of both sides of the opening above the bridge frame slot body, and bolt holes are arranged on the bridge frame cover plate at positions corresponding to the screw holes of the bridge frame slot body.

[0008] The positive pressure gas pipeline is provided with no less than two exhaust holes in the inner part of each section of the bridge frame slot body, and the positive pressure gas pipeline is connected to an air compressor; the gas compressed by the air compressor is one of nitrogen, carbon dioxide, and pure air without flammable and explosive properties.

[0009] The beneficial effect of the micro-positive pressure explosion-proof cable tray of the present application compared with the prior art is that it can effectively isolate the cables in the cable tray from the external environment, and prevent explosive or flammable substances from escaping into the cable tray due to poor sealing of equipment and pipelines. It has high safety performance and will not cause fire or explosion accidents due to ignition such as cable overload heating and mechanical damage. It is easy to construct and maintain, and can be widely used in gas and dust working environments such as chemical, coal mining, and metallurgy. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the embodiments of the present utility model, the drawings required for use in the embodiments are briefly introduced below.

[0011] Figure 1 It is a schematic diagram of the structure of the utility model;

[0012] Figure 2 This is a cross-sectional view of the plugging plate of the utility model taken along the BB direction;

[0013] Figure 3 This is a cross-sectional view of the plugging plate of the utility model along the AA direction

[0014] in:

[0015] Bridge trough body, 2-bridge cover plate, 3-positive pressure gas pipeline, 11-sealing plate, 12-cable hole, 13-flame retardant silicone sealing ring, 14-flame retardant sealing strip, 15-screw hole, 16-sealing plate buckle, 17-flame retardant silicone sealing ring buckle, 21-bolt hole, 31-exhaust hole, 32-pressure sensor. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings of the utility model to clearly and completely describe the technical solution of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, but not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0017] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "one side", "one end", "one side" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0018] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0019] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0020] It should also be understood that the terms used in the utility model specification are only for the purpose of describing specific embodiments and are not intended to limit the utility model. As used in the utility model specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0021] It should be further understood that the term "and / or" used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0022] The accompanying drawings show various structural schematic diagrams of the embodiments disclosed in the utility model. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0023] Referring to the attached drawings, the present application is a micro-positive pressure flameproof cable tray, comprising a tray trough 1, a tray cover 2, and a positive pressure gas pipeline 3, characterized in that: the tray trough 1 opens upward, and the positive pressure gas pipelines 3 are longitudinally fixed at the bottom corners on both sides of the interior, and the tray cover 2 is installed above the tray trough 1;

[0024] A flame retardant sealing strip 14 is provided at the connection between the opening above the bridge trough body 1 and the bridge cover plate 2; a blocking plate 11 is also installed at both ends of the bridge trough body 1, and the blocking plate 11 is divided into an upper and a lower piece, and the upper and lower blocking plates 11 are respectively opened with semicircular holes, and the two semicircular holes are connected to form a cable hole 12, and a flame retardant silicone sealing ring 13 is installed on the cable hole 12;

[0025] The blocking plate 11 is connected to the bridge trough body 1 by a card slot, the upper and lower pieces of the blocking plate 1 are connected by a buckle, and a flame retardant sealing strip 14 is provided at the connection between the blocking plate 11 and the bridge trough body 1, the bridge cover plate 2, and the upper and lower pieces of the blocking plate 11;

[0026] The flame retardant silicone sealing ring 13 is composed of two parts, the upper and lower parts of which are respectively fixed on the upper and lower sealing plates 11. The flame retardant silicone sealing ring 13 has a corrugated structure to be suitable for sealing cables with different diameters. The upper and lower parts of the flame retardant silicone sealing ring 13 are connected by snap fasteners.

[0027] A pressure sensor 32 is also provided on the inner wall of the bridge tank body 1 .

[0028] Two or more screw holes 15 are respectively arranged on the top edges of both sides of the opening above the bridge frame slot body 1 , and bolt holes 21 are arranged on the bridge frame cover plate 2 at positions corresponding to the screw holes 15 of the bridge frame slot body 1 .

[0029] The positive-pressure gas pipeline 3 is provided with no less than two exhaust holes 31 in each section of the bridge tank 1. The positive-pressure gas pipeline 3 in the flammable and explosive environment is connected in series and parallel, and the positive-pressure gas pipeline 3 is connected to the air compressor; the gas compressed by the air compressor is one of nitrogen, carbon dioxide, and pure air without flammable and explosive properties.

[0030] During operation, the internal pressure of the bridge frame tank body is maintained between 70Pa and 400Pa. When the pressure sensor detects that the pressure in the bridge frame tank body is lower than 200Pa, the air compressor is controlled to increase power and quickly replenish the pressure; when the pressure sensor detects that the pressure in the bridge frame tank body reaches 400Pa, the air compressor is controlled to stop running; when the pressure sensor detects that the pressure in the bridge frame tank body is lower than 100Pa, the air compressor is controlled to increase power and issue an alarm.

Claims

1. A slightly positive pressure flameproof cable tray, comprising a tray body (1), a tray cover (2), and a positive pressure gas pipeline (3), characterized in that: The bridge trough body (1) is open upward, and positive pressure gas pipelines (3) are longitudinally fixed at the bottom corners on both sides of the bridge trough body (1), and the bridge cover plate (2) is installed above the bridge trough body (1); A flame retardant sealing strip (14) is provided at the connection between the opening above the bridge trough body (1) and the bridge cover plate (2); a sealing plate (11) is installed at both ends of the bridge trough body (1), the sealing plate (11) is divided into an upper and lower piece, the upper and lower sealing plates (11) are respectively provided with semicircular holes, the two semicircular holes are connected to form a cable hole (12), and a flame retardant silicone sealing ring (13) is installed on the cable hole (12); The blocking plate (11) is connected to the bridge trough body (1) by means of a slot connection, the upper and lower pieces of the blocking plate (11) are connected by means of a buckle connection, and a flame retardant sealing strip (14) is provided at the connection between the blocking plate (11) and the bridge trough body (1), the bridge cover plate (2), and the upper and lower blocking plates (11); The flame retardant silicone seal ring (13) is composed of two parts, upper and lower parts, which are respectively fixed on the upper and lower sealing plates (11); the flame retardant silicone seal ring (13) is in a corrugated structure; the upper and lower parts of the flame retardant silicone seal ring (13) are connected by a snap-fit ​​connection.

2. A slightly positive pressure flameproof cable tray according to claim 1, characterized in that: A pressure sensor (32) is also provided on the inner wall of the bridge trough body (1).

3. The slightly positive pressure flameproof cable tray according to claim 1 is characterized in that: Two or more screw holes (15) are respectively provided on the top edges of both sides of the upper opening of the bridge frame trough body (1), and bolt holes (21) are provided on the bridge frame cover plate (2) at positions corresponding to the screw holes (15) of the bridge frame trough body (1).

4. The slightly positive pressure flameproof cable tray according to claim 1 is characterized in that: The positive pressure gas pipeline (3) is provided with no less than two exhaust holes (31) in each section of the bridge tank (1), and the positive pressure gas pipeline (3) is connected to an air compressor; the gas compressed by the air compressor is one of nitrogen, carbon dioxide, and pure air that does not contain flammable or explosive properties.

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