Fireproof flame-retardant tubular busbar

Abstract

The utility model discloses a fireproof flame-retardant tubular bus which comprises a copper conductor, a composite insulating layer is arranged on the outer layer of the copper conductor, a metal sheath is arranged on the outer layer of the composite insulating layer, a composite protective layer is arranged on the outer layer of the metal sheath, and a flame-retardant wrapping layer is arranged on the outer side of the composite protective layer. By designing the composite protective layer, the wear-resistant layer is designed on the outermost side on the basis of flame-retardant protection of an original metal sheath, so that the metal sheath is prevented from being damaged by wear and corrosion and reducing the protective performance, and the heat-insulating layer on the inner side of the wear-resistant layer further strengthens the heat-insulating effect and has a certain flame-retardant effect, so that the metal sheath is prevented from being damaged when the outside is on fire. The interior of the metal sheath is damaged due to rapid temperature rise; and the flame-retardant particle layer filled between the wear-resistant layer and the heat-insulating layer is made of an aluminum oxide ceramic powder material, so that the flame-retardant particle layer has good flame-retardant performance and can play a secondary protection role after the wear-resistant layer is burnt through.

Description

Technical Field

[0001] The utility model relates to the technical field of tubular busbars, in particular to a fire-resistant and flame-retardant tubular busbar. Background Art

[0002] The tubular busbar, also known as "tubular cable", is a busbar product that uses copper tube or aluminum alloy tube as conductor and is insulated on the outside. It has high conductivity, excellent mechanical strength and good heat dissipation performance, and can meet the requirements of the power system for conductive equipment. Traditional tubular busbars are mostly composed of a conductive layer, an insulating layer and a sheath layer.

[0003] In order to improve the flame retardant performance of existing tubular busbars, the sheath layer usually uses materials with high flame retardant performance and strength, so most of them use a metal shell on the outermost side of the tubular busbar for protection. However, although the metal itself has a certain heat resistance, under external high temperature conditions, its own temperature will rise rapidly, causing damage to the inside and even causing a fire; at the same time, the surface of the metal sheath is easily worn by the external environment, causing burrs or becoming rough, which may reduce the flame retardant performance of the metal sheath; in addition, there is only one insulating layer inside with average insulation strength and low shielding performance.

[0004] In view of this, the existing structural deficiencies are studied and improved, and a fire-resistant and flame-retardant tubular busbar is proposed. Utility Model Content

[0005] The utility model aims to provide a fire-resistant and flame-retardant tubular busbar, which solves the problems raised in the above-mentioned background technology by adding a reinforced flame-retardant layer outside a traditional metal sheath.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a fire-resistant and flame-retardant tubular busbar, comprising a copper conductor, the outer layer of the copper conductor is provided with a composite insulation layer, the outer layer of the composite insulation layer is provided with a metal sheath, the outer layer of the metal sheath is provided with a composite protective layer, the outer side of the composite protective layer is provided with a flame-retardant cladding, the composite protective layer comprises a heat insulation layer and a wear-resistant layer, a flame-retardant particle layer is filled between the interlayers formed by the heat insulation layer and the wear-resistant layer, the heat insulation layer is clamped on the outer side of the metal sheath, and the flame-retardant cladding is wrapped around the outer layer of the wear-resistant layer.

[0007] Preferably, the heat insulating layer is made of heat insulating and flame retardant asbestos, the flame retardant particle layer is made of alumina ceramic powder, and the wear-resistant layer is made of flame retardant polyethylene.

[0008] Preferably, the flame retardant particle layer enters the interlayer formed by the heat insulation layer and the wear-resistant layer by means of compaction filling.

[0009] Preferably, a flame retardant coating is coated on the surface of the wear-resistant layer, and the flame retardant coating is made of alumina ceramics.

[0010] Preferably, the inner layer of the metal sheath is provided with a shielding layer, and the shielding layer is made of a braided copper mesh and is tightly attached to the inner wall of the metal sheath and the outer wall of the composite insulation layer.

[0011] Preferably, the composite insulation layer consists of an inner insulation layer and an outer insulation layer, the inner insulation layer is made of polytetrafluoroethylene and is located between the outer insulation layer and the copper conductor, and the outer insulation layer is made of ethylene propylene rubber and is located in the inner layer of the metal sheath.

[0012] Preferably, the flame retardant cladding is made of fireproof tape, and the flame retardant cladding is evenly wound on the outer layer of the composite protective layer.

[0013] Preferably, a row of convex strips are arranged in a ring shape on the surface of the metal sheath, and recesses corresponding to the convex strips are provided on the inner side of the thermal insulation layer, and the convex strips are snap-connected to the thermal insulation layer through the recesses.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] 1. By designing a composite protective layer, on the basis of the original flame retardant protection of the metal sheath, the wear-resistant layer is designed on its outermost side, so that the metal sheath can avoid wear and corrosion damage and reduce the protective performance, while the heat insulation layer inside the wear-resistant layer further enhances the heat insulation effect and has a certain flame retardant effect, so as to avoid the metal sheath from damaging the inside due to rapid temperature rise when the outside is on fire. The flame retardant particle layer filled between the wear-resistant layer and the heat insulation layer is made of alumina ceramic powder material and has good flame retardant properties; it can play a secondary protection role after the wear-resistant layer is burned through, solving the problem of insufficient fire retardant effect of the metal sheath in the prior art.

[0016] 2. By designing flame-retardant coatings and flame-retardant claddings, in actual applications, the flame-retardant coating can be applied on the surface of the wear-resistant layer as an auxiliary optimization to further enhance the flame-retardant effect, while the flame-retardant cladding can be wrapped around the outside of the wear-resistant layer of the busbar to further improve the flame-retardant and waterproof effects and prevent moisture from damaging the coating or protective layer.

[0017] 3. In terms of optimizing insulation shielding performance, the shielding layer can be designed to evenly distribute the electric field, improve insulation reliability and reduce electromagnetic interference. The inner insulation layer in the composite insulation layer is made of polytetrafluoroethylene, which has excellent insulation performance, and has good heat resistance, cold resistance and aging resistance. The outer insulation layer is made of EPDM rubber, which has slightly lower insulation properties but needs to have better mechanical strength and wear resistance. The combination of the two makes the insulation layer safer and more reliable and increases the overall strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 It is a schematic diagram of the cross-sectional structure of the composite protective layer;

[0020] Figure 3 It is a front view cross-sectional structural schematic diagram of the utility model;

[0021] Figure 4 It is a schematic diagram of the structure of the shielding layer;

[0022] Figure 5 Schematic diagram of the structure of the thermal insulation layer.

[0023] In the figure: 1. copper conductor; 2. composite insulation layer; 21. inner insulation layer; 22. outer insulation layer; 3. metal sheath; 31. convex strip; 4. composite protective layer; 41. thermal insulation layer; 42. wear-resistant layer; 43. flame-retardant particle layer; 44. flame-retardant coating; 5. flame-retardant cladding; 6. shielding layer. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in 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.

[0025] like Figure 1-Figure 5 As shown, a fire-resistant and flame-retardant tubular busbar of this embodiment includes a copper conductor 1, a composite insulating layer 2 is provided on the outer layer of the copper conductor 1, a metal sheath 3 is provided on the outer layer of the composite insulating layer 2, a composite protective layer 4 is provided on the outer layer of the metal sheath 3, a flame-retardant cladding 5 is provided on the outer side of the composite protective layer 4. The composite protective layer 4 includes a heat-insulating layer 41 and a wear-resistant layer 42, a flame-retardant particle layer 43 is filled between the interlayers formed by the heat-insulating layer 41 and the wear-resistant layer 42, the heat-insulating layer 41 is clamped on the outer side of the metal sheath 3, and the flame-retardant cladding 5 is wrapped around the outer layer of the wear-resistant layer 42.

[0026] The heat insulation layer 41 is made of heat-insulating flame-retardant asbestos, the flame-retardant particle layer 43 is made of alumina ceramic powder, and the wear-resistant layer 42 is made of flame-retardant polyethylene. The flame-retardant particle layer 43 enters the interlayer formed by the heat insulation layer 41 and the wear-resistant layer 42 by compaction filling. By designing the composite protective layer 4, on the basis of the flame-retardant protection of the original metal sheath 3, the wear-resistant layer 42 is designed on its outermost side. Since polyethylene itself has good strength, and polyethylene has a certain flame-retardant effect by adding flame retardants, the metal sheath 3 is prevented from being damaged by wear and corrosion and reducing its protective performance. The heat insulation layer 41 inside the wear-resistant layer 42 further strengthens the heat insulation effect and has a certain flame-retardant effect, so as to prevent the metal sheath 3 from being damaged internally due to rapid temperature rise when the outside is on fire. The flame retardant particle layer 43 filled between the wear-resistant layer 42 and the heat-insulating layer 41 is made of alumina ceramic powder material, has excellent flame retardant properties, can maintain stable performance in high temperature environments, is not prone to chemical reactions or decomposition, will not burn at high temperatures, and can provide secondary protection after the wear-resistant layer 42 is burned through. It should be noted that the flame retardant particle layer 43 is filled by compaction, which is a prior art method, so the detailed principle is not repeated here, which can enhance the stability of the flame retardant particle layer 43 and avoid gaps and depressions in the interlayer.

[0027] The surface of the wear-resistant layer 42 is coated with a flame-retardant coating 44, which is made of alumina ceramics, and the flame-retardant cladding 5 is made of fireproof tape, and the flame-retardant cladding 5 is evenly wound on the outer layer of the composite protective layer 4. In terms of further auxiliary optimization of flame retardancy, through the design of the flame-retardant coating 44 and the flame-retardant cladding 5, in actual applications, the flame-retardant coating 44 can be coated on the surface of the wear-resistant layer 42 as an auxiliary optimization to further enhance the flame-retardant effect, and the flame-retardant cladding 5 can be wound around the outside of the wear-resistant layer 42 of the busbar, thereby further improving the flame-retardant and waterproof effects and preventing moisture from damaging the coating or protective layer.

[0028] The composite insulating layer 2 is composed of an inner insulating layer 21 and an outer insulating layer 22. The inner insulating layer 21 is made of polytetrafluoroethylene and is located between the outer insulating layer 22 and the copper conductor 1. The outer insulating layer 22 is made of ethylene propylene rubber and is located in the inner layer of the metal sheath 3. The inner layer of the metal sheath 3 is provided with a shielding layer 6. The shielding layer 6 is made of a woven copper mesh and fits tightly to the inner wall of the metal sheath 3 and the outer wall of the composite insulating layer 2. In terms of optimizing the insulation shielding performance, the shielding layer 6 is designed to evenly distribute the electric field, improve insulation reliability and reduce electromagnetic interference. The inner insulating layer 21 in the composite insulating layer 2 is made of polytetrafluoroethylene and has good insulation performance, and has good heat resistance, cold resistance and aging resistance. The outer insulating layer 22 is made of ethylene propylene rubber, and although the insulation is slightly lower, it needs to have better mechanical strength and wear resistance. The combination of the two makes the insulation layer safer and more reliable, and increases the overall strength.

[0029] A row of ridges 31 are arranged in a ring shape on the surface of the metal sheath 3, and a notch corresponding to the ridge 31 is provided on the inner side of the thermal insulation layer 41, and the ridge 31 is snap-connected with the thermal insulation layer 41 through the notch. By designing the ridge 31, when in use, the composite protective layer 4 is put on the outside of the metal sheath 3, and the ridge 31 passes through the notch of the thermal insulation layer 41, thereby enhancing the tightness of the connection, so that the composite protective layer 4 will not rotate on the outer layer of the metal sheath 3, making the whole more durable and compact.

[0030] The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

Claims

1. A fire-resistant and flame-retardant tubular busbar, comprising a copper conductor (1), characterized in that: The copper conductor (1) is provided with a composite insulating layer (2) on its outer layer, the composite insulating layer (2) is provided with a metal sheath (3) on its outer layer, the metal sheath (3) is provided with a composite protective layer (4) on its outer layer, and a flame retardant sheath (5) is provided on the outer side of the composite protective layer (4); The composite protective layer (4) comprises a heat insulating layer (41) and a wear-resistant layer (42), a flame retardant particle layer (43) is filled between the interlayers formed by the heat insulating layer (41) and the wear-resistant layer (42), the heat insulating layer (41) is engaged with the outside of the metal sheath (3), and the flame retardant cladding (5) is wrapped around the outer layer of the wear-resistant layer (42).

2. A fire-resistant and flame-retardant tubular busbar according to claim 1, characterized in that: The heat insulating layer (41) is made of heat insulating and flame retardant asbestos, the flame retardant particle layer (43) is made of alumina ceramic powder, and the wear-resistant layer (42) is made of flame retardant polyethylene.

3. The fire-resistant and flame-retardant tubular busbar according to claim 2, characterized in that: The flame retardant particle layer (43) enters the interlayer formed by the heat insulation layer (41) and the wear-resistant layer (42) by means of compaction filling.

4. The fire-resistant and flame-retardant tubular busbar according to claim 2, characterized in that: A flame retardant coating (44) is coated on the surface of the wear-resistant layer (42), and the flame retardant coating (44) is made of alumina ceramics.

5. The fire-resistant and flame-retardant tubular busbar according to claim 1, characterized in that: The inner layer of the metal sheath (3) is provided with a shielding layer (6), and the shielding layer (6) is made of a braided copper mesh and is tightly fitted to the inner wall of the metal sheath (3) and the outer wall of the composite insulation layer (2).

6. The fire-resistant and flame-retardant tubular busbar according to claim 1, characterized in that: The composite insulating layer (2) is composed of an inner insulating layer (21) and an outer insulating layer (22); the inner insulating layer (21) is made of polytetrafluoroethylene and is located between the outer insulating layer (22) and the copper conductor (1); the outer insulating layer (22) is made of ethylene propylene rubber and is located inside the metal sheath (3).

7. The fire-resistant and flame-retardant tubular busbar according to claim 1, characterized in that: The flame retardant cladding (5) is made of fireproof tape, and the flame retardant cladding (5) is evenly wound around the outer layer of the composite protective layer (4).

8. The fire-resistant and flame-retardant tubular busbar according to claim 1, characterized in that: The surface of the metal sheath (3) is designed with a row of convex strips (31) arranged in an annular shape, the inner side of the heat insulation layer (41) is provided with recesses corresponding to the convex strips (31), and the convex strips (31) are snap-fitted and connected to the heat insulation layer (41) via the recesses.

Images