Explosion-proof shell of cable intermediate joint

Abstract

The utility model belongs to the technical field of power equipment, and particularly relates to a cable intermediate joint explosion-proof shell which comprises a non-metal explosion-proof layer and a non-metal flame-retardant enhancement layer. The inner side and the outer side of the cable intermediate joint explosion-proof shell are respectively provided with a non-metal explosion-proof layer, and the non-metal flame-retardant enhancement layer is located between the two non-metal explosion-proof layers. According to the utility model, the inner side and the outer side of the explosion-proof shell of the cable intermediate joint are respectively provided with a non-metal explosion-proof layer, so that an explosion-proof effect is achieved; compared with the prior art, the non-metal flame-retardant reinforcing layer is arranged between the two non-metal explosion-proof layers, the flame retardance and the overall strength of the explosion-proof shell are guaranteed, compared with metal materials, the light-weight requirement of the explosion-proof shell in the installation process is met, and meanwhile the explosion-proof shell has the advantages of being good in flame retardance, good in explosion resistance, high in impact resistance, high in bearing capacity and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of electric power equipment, and particularly relates to an explosion-proof shell for a cable intermediate joint. Background Art

[0002] The explosion-proof shell for a cable joint is a safety device for preventing explosion at the cable joint. The current explosion-proof devices for cable joints mainly include elements such as flame-retardant materials, explosion-proof shields, and explosion-proof covers. The design purpose is to prevent the possible fire and explosion risks at the cable joint.

[0003] However, most of the traditional explosion-proof devices for cable joints are made of metal. However, the metal explosion-proof devices are heavy in weight, imposing an extra burden on the cable load. Moreover, the metal explosion-proof devices have problems caused by the material properties themselves such as corrosion and fatigue, resulting in a short service life of the metal explosion-proof devices.

[0004] An intermediate joint flame-retardant fiberglass explosion-proof shell disclosed in Chinese Patent Document CN202663076U (CN201220288001.7) can reduce the weight of the explosion-proof shell and has certain flame retardancy and corrosion resistance, but the overall explosion-proof effect is poor. Content of the Utility Model

[0005] The purpose of the utility model is to provide an explosion-proof shell for a cable intermediate joint. By using a non-metallic explosion-proof layer and a non-metallic flame-retardant reinforcement layer to make the explosion-proof shell body, the effects of overall lightweight, high strength, corrosion resistance, fatigue resistance, flame retardancy, and high temperature resistance of the explosion-proof shell are achieved, and it has better explosion-proof performance.

[0006] The technical problem to be solved by the utility model is realized by adopting the following technical solution: an explosion-proof shell for a cable intermediate joint, comprising a non-metallic explosion-proof layer and a non-metallic flame-retardant reinforcement layer;

[0007] One layer of non-metallic explosion-proof layer is arranged on each of the inner side and the outer side of the explosion-proof shell for the cable intermediate joint, and the non-metallic flame-retardant reinforcement layer is located between the two non-metallic explosion-proof layers.

[0008] Preferably, the non-metallic explosion-proof layer of the utility model is Kevlar fiber prepreg. The Kevlar material has a low density, high strength, good toughness, high temperature resistance, easy processing and molding. Its strength is 5 times that of steel of the same mass, but the density is only one-fifth of that of steel. Therefore, using Kevlar fiber prepreg as the non-metallic explosion-proof layer can achieve explosion-proof while reducing the overall weight of the explosion-proof shell. By setting two layers of Kevlar fiber prepreg, the impact force generated when the cable explodes due to a short circuit is greatly reduced.

[0009] Preferably, the non-metallic flame-retardant reinforcement layer of the utility model is lightweight fiber prepreg.

[0010] Preferably, the light fiber prepreg is any one of carbon fiber prepreg, glass fiber prepreg, ramie fiber prepreg, basalt fiber prepreg, quartz fiber prepreg and ultra-high molecular weight polyethylene fiber prepreg. Carbon fiber prepreg, glass fiber prepreg, ramie fiber prepreg, basalt fiber prepreg, quartz fiber prepreg and ultra-high molecular weight polyethylene fiber prepreg have the characteristics of high mechanical strength and light weight, so carbon fiber prepreg, glass fiber prepreg, ramie fiber prepreg, basalt fiber prepreg, quartz fiber prepreg and ultra-high molecular weight polyethylene fiber prepreg are used as non-metallic flame retardant reinforcement layers. Carbon fiber prepreg or glass fiber prepreg is preferred.

[0011] Preferably, the non-metallic reinforcement layer of the present invention comprises multiple layers of lightweight fiber prepreg cloth. Multiple layers of lightweight fiber prepreg cloth may be provided according to the thickness requirement of the explosion-proof housing.

[0012] Preferably, the layers of lightweight fiber prepreg are staggered and laid together. By staggered laying of the layers of carbon fiber prepreg or glass fiber prepreg together, the mechanical properties of the explosion-proof shell are further enhanced, and staggered laying means that the laying angles are different.

[0013] Preferably, the non-metallic reinforcement layer of the utility model comprises at least four layers of lightweight fiber prepreg, and the staggered laying angles of each layer of lightweight fiber prepreg are 0°, 45°, 90° and -45° along the axial direction of the explosion-proof shell. This laying method can increase the toughness and strength of the product at different angles, thereby increasing the overall strength.

[0014] Preferably, the surface of the light fiber prepreg is coated with a flame retardant resin layer. By coating the surface of the carbon fiber prepreg or the glass fiber prepreg with a flame retardant resin layer, a flame retardant effect is achieved.

[0015] Preferably, the cable intermediate joint explosion-proof shell is prepared by a molding process. The cable intermediate joint explosion-proof shell is prepared by a molding process, and the non-metallic flame retardant reinforcement layer and the non-metallic explosion-proof layer are fused together by heating and pressurizing to improve the molding effect.

[0016] Compared with the prior art, the beneficial effects of the utility model are as follows: the utility model arranges a non-metallic explosion-proof layer on the inner and outer sides of the explosion-proof shell of the cable intermediate joint to play an explosion-proof role; a non-metallic flame retardant reinforcement layer is arranged between the two non-metallic explosion-proof layers to ensure the flame retardancy and overall strength of the explosion-proof shell. Compared with metal materials, the utility model not only realizes the lightweight demand of the explosion-proof shell during the installation process, but also makes it have the advantages of good flame retardancy, good explosion resistance, strong impact resistance, strong bearing capacity and the like. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1This is a schematic structural diagram of the explosion-proof housing of the cable intermediate joint described in the embodiment;

[0018] Figure 2 This is a schematic diagram of the structure of the non-metallic flame retardant reinforcement layer described in the embodiment;

[0019] In the figure, 1 is a non-metallic explosion-proof layer, and 2 is a non-metallic flame-retardant reinforcement layer. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present utility model will be described clearly and completely below in conjunction with the accompanying drawings.

[0021] like Figure 1 As shown, a cable intermediate joint explosion-proof shell includes a non-metallic explosion-proof layer 1 and a non-metallic flame-retardant reinforcement layer 2.

[0022] A non-metallic explosion-proof layer 1 is provided on the inner side and the outer side of the explosion-proof shell of the cable intermediate joint, and the non-metallic flame-retardant reinforcement layer 2 is located between the two non-metallic explosion-proof layers 1 .

[0023] The non-metallic explosion-proof layer 1 is a Kevlar fiber prepreg cloth.

[0024] The non-metallic flame retardant reinforcement layer 2 is a lightweight fiber prepreg cloth. Specifically, the lightweight fiber prepreg cloth is a carbon fiber prepreg cloth.

[0025] The non-metallic reinforcement layer 2 includes multiple layers of carbon fiber prepreg fabrics.

[0026] Each layer of carbon fiber prepreg or glass fiber prepreg is laid together in an alternating manner.

[0027] like Figure 2 As shown, the non-metallic reinforcement layer 2 includes at least four layers of carbon fiber prepreg fabrics, and the staggered laying angles of the layers of carbon fiber prepreg fabrics are 0°, 45°, 90° and -45° along the axial direction of the explosion-proof shell.

[0028] The surface of the carbon fiber prepreg cloth or the glass fiber prepreg cloth is coated with a flame retardant resin layer.

[0029] In this embodiment, the method for preparing the explosion-proof shell of the cable intermediate joint includes the following steps: cutting - laying Kevlar fiber prepreg - laying carbon fiber prepreg - laying Kevlar fiber prepreg - molding - demoulding - finishing.

[0030] Specifically, the required Kevlar fiber prepreg and carbon fiber prepreg are cut and blanked by an automatic cloth cutting machine.

[0031] When cutting the carbon fiber prepreg, it should be cut separately according to the laying angle. When preparing the carbon fiber prepreg, unidirectional carbon fiber cloth is made by selecting carbon fiber bundles according to material requirements, such as using 300 carbon fiber bundles. At this time, attention should be paid to the laying angle of the carbon fiber bundles, and the fiber bundles should be laid according to the required product laying angle.

[0032] During laying, there should be no wrinkles, bulges and other phenomena. When laying the product layers, the interval time between each layer laying should not be too long, and after each layer laying is completed, the air bubbles between the prepreg and the mold, and between the prepregs should be squeezed out to avoid defects such as air bubbles, so as to ensure its density.

[0033] After laying the carbon fiber prepreg, lay a layer of Kevlar fiber prepreg. After laying is completed, the product is cured by the compression molding process. The curing time is 3h and the curing temperature is 120℃. During curing, a temperature measuring gun should be used to measure the temperature of the mold to ensure that the mold temperature is the preset value. If there is a temperature deviation, the curing temperature should be adjusted.

[0034] After the curing time is over, the mold should be cooled naturally. During this period, a temperature measuring gun should be used to measure the temperature in real time. When the temperature drops to 25℃, stop cooling.

[0035] When the cooling temperature reaches 25℃, the mold is demolded. When demolding, attention should be paid to the balance of the mold lifting to avoid damage to the product caused thereby.

[0036] After demolding is completed and the product is taken out, CNC machining is used for the final trimming of the product.

[0037] In the explosion-proof shell provided by the present utility model, the explosion-proof shell includes an upper shell and a lower shell. The upper shell and the lower shell are detachably assembled together to form the explosion-proof shell. The non-metallic explosion-proof layer 1 of the upper shell and the lower shell uses non-metallic carbon fiber prepreg material, which not only realizes the lightweight requirement of the explosion-proof shell during the installation process, but also can significantly improve the mechanical properties of the final product. At the same time, it has the advantages of good flame retardancy, good explosion resistance, strong impact resistance, strong bearing capacity, acid and alkali resistance, high temperature resistance, etc. It is a new type of explosion-proof shell with broad application scenarios.

[0038] In the explosion-proof shell provided by the present utility model, upper and lower layers of Kevlar fiber prepregs are added to the inner and outer surfaces as the non-metallic explosion-proof layer 1, which greatly reduces the impact force generated during the explosion when a short circuit occurs and improves its explosion-proof performance.

[0039] The specific performance in terms of lightweight is as follows: Taking an explosion-proof shell with a length of 1400 mm, a head diameter of 100 mm, and a middle diameter of 200 mm as an example, the weight of the explosion-proof shell made of fiberglass material is about 8 - 10 kg, the weight of the explosion-proof shell made of stainless steel material is about 10 - 15 kg, while the weight of the explosion-proof shell made of carbon fiber prepreg material is about 4.2 - 4.3 kg. Compared with the former two, the weight is greatly reduced.

[0040] The specific performance in terms of mechanical properties is as follows: The tensile strength of carbon fiber prepreg is 3500 Mpa, the tensile strength of fiberglass is 100 - 500 Mpa, and the tensile strength of stainless steel is 550 - 620 Mpa; the tensile modulus of carbon fiber prepreg is 230 Gpa, the tensile modulus of fiberglass is 10 - 40 Gpa, and the tensile modulus of stainless steel is 90 - 200 Gpa; the thermal conductivity coefficient of carbon fiber prepreg is 1 - 2 W / m·k, the thermal conductivity coefficient of fiberglass is 0.15 - 0.3 W / m·k, and the thermal conductivity coefficient of stainless steel is 10 - 30 W / m·k; the high-temperature resistance temperature of carbon fiber prepreg can reach 2000 °C, the high-temperature resistance temperature of fiberglass is 100 - 700 °C, and the high-temperature resistance temperature of stainless steel is 600 - 1000 °C; at the same time, the flame-retardant resin on the surface of carbon fiber prepreg has flame retardancy; it has very high corrosion resistance to media and can basically remain unchanged in terms of elastic modulus, strength, diameter, etc. even in 50% hydrochloric acid, sulfuric acid, or phosphoric acid.

Claims

1. An explosion-proof shell for a cable joint in the middle, characterized in that: It comprises a non-metallic explosion-proof layer (1) and a non-metallic flame-retardant reinforcement layer (2); A non-metallic explosion-proof layer (1) is provided on the inner side and the outer side of the explosion-proof shell of the cable intermediate joint, and the non-metallic flame-retardant reinforcement layer (2) is located between the two non-metallic explosion-proof layers (1).

2. The explosion-proof shell of the cable joint in the middle according to claim 1, characterized in that: The non-metallic explosion-proof layer (1) is a Kevlar fiber prepreg cloth.

3. The explosion-proof shell of the cable joint in the middle according to claim 1, characterized in that: The non-metallic flame retardant reinforcement layer (2) is a lightweight fiber prepreg cloth.

4. The explosion-proof shell of the cable joint in the middle according to claim 3, characterized in that: The lightweight fiber prepreg is any one of carbon fiber prepreg, glass fiber prepreg, ramie fiber prepreg, basalt fiber prepreg, quartz fiber prepreg and ultra-high molecular weight polyethylene fiber prepreg.

5. The explosion-proof shell of the cable joint in the middle according to claim 3, characterized in that: The non-metallic flame retardant reinforcement layer (2) comprises multiple layers of lightweight fiber prepreg fabric.

6. The explosion-proof shell of the cable joint in the middle according to claim 5, characterized in that: The layers of lightweight fiber prepreg are laid together in an alternating pattern.

7. The explosion-proof shell of the cable joint in the middle according to claim 6, characterized in that: The non-metallic flame retardant reinforcement layer (2) comprises at least four layers of lightweight fiber prepreg fabrics, and the angles of staggered laying of the layers of lightweight fiber prepreg fabrics are 0°, 45°, 90°, and -45° respectively along the axial direction of the explosion-proof shell.

8. The explosion-proof shell of the cable joint in the middle according to claim 3, characterized in that: The surface of the lightweight fiber prepreg cloth is coated with a flame retardant resin layer.

9. The explosion-proof shell of the cable joint in the middle according to claim 1, wherein: The explosion-proof shell of the cable intermediate joint is prepared by a molding process.

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