Self-closed magnesium oxide insulated mineral cable and connecting structure

Abstract

The utility model belongs to the technical field of cables, particularly relates to a self-closed magnesium oxide insulated mineral cable and a connecting structure, and aims to solve the problems that a conventional BTTZ cable adopts a magnesium oxide filler for insulation, is extremely easy to absorb moisture, causes reduction of insulation level, is not suitable for a humid environment, cannot be in contact with air, and is inconvenient to use. In order to solve the problems of moisture absorption of an insulating layer, insulation failure and even large safety accidents caused by excessive joints, defects of copper materials and various mechanical damages, the utility model provides the following scheme: the cable comprises two cable bodies, and each cable body comprises a nylon protective sleeve, a copper sheath, an insulating filler and a copper inner core from outside to inside in sequence; and the first connecting block and the second connecting block are respectively fixed at the two ends of the cable body, so that the electrical safety and reliability of the product during production, installation and laying and daily use are improved, and the loss during installation and laying is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to a self-enclosed magnesium oxide insulated mineral cable and a connection structure. Background Art

[0002] Mainly BTTZ heavy copper core copper sheathed cable, with copper rod as conductor core, magnesium oxide filler as insulation, copper tube as sheath, and made by multiple high-temperature drawing. Mainly in accordance with the British BS6387 standard, it meets the fire protection requirements of special and first-class buildings, that is, it has 180 minutes of uninterrupted power supply, anti-spraying and anti-impact performance under fire conditions.

[0003] BTTZ cables use magnesium oxide fillers for insulation, which is very easy to absorb moisture and cause the insulation level to drop. They are not suitable for humid environments and cannot be exposed to air. Too many intermediate joints, defects in copper materials and various mechanical damages will cause the insulation layer to absorb moisture and fail to work, and even cause major safety accidents. Because some lines of some fire protection systems are not usually energized and the lines are cold, BTTZ cables are more likely to absorb moisture without being aware of it. As a result, once a disaster occurs, the lines are not only unable to resist fire and help escape and disaster relief, but also lead to secondary new accidents due to their inability to work normally. Utility Model Content

[0004] The purpose of the utility model is to solve the shortcomings of the prior art that BTTZ cables use magnesium oxide fillers as insulation, which are very easy to absorb moisture and cause the insulation level to decrease, are not suitable for humid environments, cannot be exposed to air, and have too many intermediate joints, defects in copper materials and various mechanical damages, which can lead to moisture absorption of the insulation layer, insulation failure, and even cause major safety accidents. A self-enclosed magnesium oxide insulated mineral cable and connection structure are proposed.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A self-enclosed magnesium oxide insulated mineral cable and a connection structure, comprising two cable bodies, wherein the cable bodies are sequentially composed of a nylon protective sheath, a copper sheath, an insulating filler and a copper inner core from the outside to the inside;

[0007] A first connecting block and a second connecting block, wherein the first connecting block and the second connecting block are respectively fixed to two ends of the cable body, the second connecting block is provided with a matching groove matching the first connecting block, and the first connecting block is provided with a receiving groove for receiving two copper inner cores;

[0008] Two groups of clamping assemblies, which are respectively arranged at two ends of the first connecting block and the second connecting block for quickly connecting the two cable bodies;

[0009] The extrusion clamping assembly is arranged between the first connecting block and the second connecting block and is used for pressing and fitting the two copper cores arranged in the accommodating groove.

[0010] In a possible design, each group of the snap-fit ​​components includes a first groove opened in the first connecting block, a snap-fit ​​block slides in the first groove, a snap-fit ​​groove is opened in the second connecting block and snap-fits with the snap-fit ​​block, at least two first springs are fixed to the bottom end of the snap-fit ​​block, and the side ends of the two first springs are fixed to the first groove.

[0011] In a possible design, the extrusion clamping assembly includes two second grooves provided in the first connecting block, a slider sliding in each of the two second grooves, an extrusion plate fixed to the adjacent ends of the two sliders, the two extrusion plates respectively extruding and contacting with the surfaces of the two copper inner cores, an extrusion groove provided in each of the two sliders, two third grooves provided in the first connecting block, an extrusion block sliding in each of the two third grooves, an extrusion rod fixed to the side ends of the two extrusion blocks, the two extrusion rods moving outwardly and penetrating into the extrusion grooves, the two extrusion rods respectively contacting with the inclined surfaces of the two extrusion grooves, the side ends of the two extrusion blocks extruding and contacting with the side walls of the matching grooves, two second springs fixed to the side ends of the two extrusion blocks, and four second springs fixed in the two respectively.

[0012] In a possible design, the extrusion clamping assembly further includes two tension springs, the side ends of the two tension springs are respectively fixed to the ends of the two sliders that are away from each other, and the two tension springs are respectively fixed in the two second grooves.

[0013] In a possible design, the adjacent ends of the two extrusion plates are both provided with anti-slip pads.

[0014] In a possible design, the insulating filler is made of magnesium oxide powder, and 3‰ dimethyl silicone oil is added to the magnesium oxide powder.

[0015] In the present application, after the first connecting block is inserted into the matching groove, when the clamping block reaches the clamping groove, the elasticity of the first spring pushes the clamping block to clamp into the clamping groove, fixing the positions of the second connecting block and the first connecting block. At the same time, when the first connecting block enters the matching groove, the inner wall of the matching groove squeezes the extrusion block into the third groove, and the extrusion block drives the extrusion rod to move inward, and the extrusion rod moves to squeeze the side wall of the extrusion groove. The extrusion groove is squeezed and drives the slider to move in a direction close to each other. The two sliders respectively drive the two extrusion plates to move in a direction close to each other, so that the two extrusion plates squeeze the two copper inner cores in a direction close to each other.

[0016] Beneficial Effects

[0017] In the utility model, the self-enclosed magnesium oxide insulated mineral cable and the connection structure can achieve the effect of quickly connecting the first connection block and the second connection block through the clamping assembly;

[0018] In the utility model, the self-enclosed magnesium oxide insulated mineral cable and connection structure can achieve the effect of clamping and fitting the two copper cores in the receiving groove by itself after the first connecting block and the second connecting block are connected by squeezing the clamping assembly;

[0019] In the utility model, the clamping assembly in the technical solution can achieve the rapid connection between the first connecting block and the second connecting block, which can effectively improve the connection efficiency between the two cable bodies. By squeezing the clamping assembly, the two copper cores in the accommodating groove can be clamped and fitted automatically after the first connecting block and the second connecting block are connected, thereby ensuring the stability of the connection between the two cable bodies.

[0020] In the utility model, 3‰ dimethyl silicone oil is added to the magnesium oxide powder, which solves the problem that the insulation of the magnesium oxide mineral insulated cable is easy to absorb moisture and the insulation resistance decreases. When the cable is installed, the cable ends that have not been temporarily sealed do not need to be cut off, which improves the electrical safety and reliability of the product during production, installation, laying and daily use, and reduces the loss during installation and laying. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a front perspective view of a self-enclosed magnesium oxide insulated mineral cable and a connection structure proposed by the utility model;

[0022] Figure 2 A cross-sectional view of a self-enclosed magnesium oxide insulated mineral cable and a connection structure proposed by the utility model;

[0023] Figure 3 A partial cross-sectional view of a self-enclosed magnesium oxide insulated mineral cable and a connection structure proposed by the utility model;

[0024] Figure 4 The utility model provides a cross-sectional view of a self-enclosed magnesium oxide insulated mineral cable and a cable with a connection structure.

[0025] In the figure: 1, cable body; 101, nylon protective sleeve; 102, copper sheath; 103, insulating filler; 104, copper inner core; 2, first connecting block; 3, second connecting block; 4, snap-in groove; 5, snap-in block; 6, matching groove; 7, accommodating groove; 8, first groove; 9, first spring; 10, second groove; 11, tension spring; 12, extrusion plate; 13, slider; 14, extrusion groove; 15, extrusion rod; 16, third groove; 17, extrusion block; 18, second spring. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0027] Example 1

[0028] Reference Figure 1-Figure 4 A self-enclosed magnesium oxide insulated mineral cable and connection structure, which is used in the field of cable technology, comprises two cable bodies 1, wherein the cable bodies 1 are composed of a nylon protective sheath 101, a copper sheath 102, an insulating filler 103 and a copper inner core 104 from outside to inside;

[0029] A first connection block 2 and a second connection block 3, the first connection block 2 and the second connection block 3 are respectively fixed to two ends of the cable body 1, the second connection block 3 is provided with a matching groove 6 matching the first connection block 2, and the first connection block 2 is provided with a receiving groove 7 for receiving two copper inner cores 104;

[0030] Two groups of snap-in assemblies, which are respectively arranged at the two ends of the first connecting block 2 and the second connecting block 3 for quickly connecting the two cable bodies 1; each group of snap-in assemblies includes a first groove 8 opened in the first connecting block 2, a snap-in block 5 is slid in the first groove 8, a snap-in groove 4 snap-in with the snap-in block 5 is opened in the second connecting block 3, at least two first springs 9 are fixed at the bottom end of the snap-in block 5, and the side ends of the two first springs 9 are fixed to the first groove 8; after the first connecting block 2 is inserted into the matching groove 6, when the snap-in block 5 reaches the snap-in groove 4, the elasticity of the first spring 9 pushes the snap-in block 5 to snap into the snap-in groove 4, fixing the position of the second connecting block 3 and the first connecting block 2;

[0031] The adjacent ends of the two extrusion plates 12 are both provided with anti-slip pads.

[0032] The extrusion clamping assembly is arranged between the first connecting block 2 and the second connecting block 3 and is used to press and fit the two copper cores 104 arranged in the accommodating groove 7; the extrusion clamping assembly includes two second grooves 10 opened in the first connecting block 2, and sliders 13 are slid in the two second grooves 10, and extrusion plates 12 are fixed to the ends of the two sliders 13 that are close to each other. The two extrusion plates 12 are respectively in contact with the surfaces of the two copper cores 104 by extrusion, and the two sliders 13 are provided with extrusion grooves 14. The first connecting block 2 is provided with two third grooves 16, and extrusion blocks 17 are slid in the two third grooves 16. Extrusion rods 15 are fixed to the side ends of the two extrusion blocks 17, and the two extrusion rods 15 are movable outward to penetrate into the extrusion grooves 10. The extrusion rod 15 is in contact with the inclined surfaces of the two extrusion grooves 14 respectively, and the side ends of the two extrusion blocks 17 are in contact with the side walls of the matching groove 6. Two second springs 18 are fixed to the side ends of the two extrusion blocks 17, and the four second springs 18 are fixed in the two 16 respectively; at the same time, when the first connecting block 2 enters the matching groove 6, the inner wall of the matching groove 6 squeezes the extrusion block 17 to enter the third groove 16, and the extrusion block 17 drives the extrusion rod 15 to move inward, and the extrusion rod 15 moves to squeeze the side wall of the extrusion groove 14. The extrusion groove 14 is squeezed and drives the slider 13 to move in a direction close to each other. The two sliders 13 respectively drive the two extrusion plates 12 to move in a direction close to each other, so that the two extrusion plates 12 squeeze the two copper inner cores 104 in a direction close to each other;

[0033] The extrusion clamping assembly further includes two tension springs 11 , the side ends of the two tension springs 11 are respectively fixed to the ends of the two sliders 13 that are away from each other, and the two tension springs 11 are respectively fixed in the two second grooves 10 .

[0034] Example 2

[0035] refer to Figure 4 , based on the improvement of Example 1: the insulating filler 103 is made of magnesium oxide powder, and 3‰ dimethyl silicone oil is added to the magnesium oxide powder;

[0036] Adding 3‰ dimethyl silicone oil to magnesium oxide powder can play a self-sealing role. The BTT cable produced by this method has both ends of the cable completely exposed to the air in a natural environment. After being placed for one month (10.8-11.8), its insulation resistance is measured and is still as high as 500MΩ or more. The disadvantages of magnesium oxide mineral insulated cable that the insulation is easy to absorb moisture and the insulation resistance decreases are completely solved. When the cable is installed, the cable ends that have not been temporarily sealed do not need to be cut off, which improves the electrical safety and reliability of the product during production, installation, laying and daily use, and reduces the loss during installation and laying.

[0037] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A connection structure of a self-enclosed magnesium oxide insulated mineral cable, It is characterized in that include: Two cable bodies (1), wherein the cable bodies (1) are composed of a nylon protective sheath (101), a copper sheath (102), an insulating filler (103) and a copper inner core (104) from the outside to the inside; A first connecting block (2) and a second connecting block (3), wherein the first connecting block (2) and the second connecting block (3) are respectively fixed to two ends of the cable body (1), a matching groove (6) matching the first connecting block (2) is provided in the second connecting block (3), and a receiving groove (7) for receiving two copper inner cores (104) is provided in the first connecting block (2); Two groups of snap-in assemblies, the two groups of snap-in assemblies being respectively arranged at two ends of the first connection block (2) and the second connection block (3) for quickly connecting the two cable bodies (1); A pressing and clamping assembly is provided between the first connecting block (2) and the second connecting block (3) and is used to press and fit two copper inner cores (104) provided in the receiving groove (7).

2. A connection structure of a self-enclosed magnesium oxide insulated mineral cable according to claim 1, It is characterized in that Each group of the snap-fit ​​components comprises a first groove (8) provided in a first connecting block (2), a snap-fit ​​block (5) slidingly arranged in the first groove (8), a snap-fit ​​groove (4) snap-fitted with the snap-fit ​​block (5) provided in the second connecting block (3), at least two first springs (9) fixed at the bottom end of the snap-fit ​​block (5), and the side ends of the two first springs (9) fixed to the first groove (8).

3. A connection structure of a self-enclosed magnesium oxide insulated mineral cable according to claim 2, It is characterized in that The extrusion clamping assembly comprises two second grooves (10) provided in the first connection block (2), a slider (13) sliding in each of the two second grooves (10), an extrusion plate (12) fixed at the adjacent ends of the two sliders (13), the two extrusion plates (12) respectively contacting with the surfaces of the two copper inner cores (104), an extrusion groove (14) provided in each of the two sliders (13), and two third grooves (16) provided in each of the two third grooves (16). An extrusion block (17) is slidably provided, and extrusion rods (15) are fixed to the side ends of the two extrusion blocks (17). The two extrusion rods (15) are movable outwards and penetrate into the extrusion groove (14). The two extrusion rods (15) are respectively in contact with the inclined surfaces of the two extrusion grooves (14). The side ends of the two extrusion blocks (17) are in extrusion contact with the side walls of the matching groove (6). Two second springs (18) are fixed to the side ends of the two extrusion blocks (17), and the four second springs (18) are respectively fixed in the two (16).

4. A connection structure of a self-enclosed magnesium oxide insulated mineral cable according to claim 3, It is characterized in that The extrusion clamping assembly further comprises two tension springs (11), the side ends of the two tension springs (11) are respectively fixed to the ends of the two sliders (13) that are away from each other, and the two tension springs (11) are respectively fixed in the two second grooves (10).

5. A connection structure of a self-enclosed magnesium oxide insulated mineral cable according to claim 3, It is characterized in that The adjacent ends of the two extrusion plates (12) are both provided with anti-slip pads.

6. A self-enclosed magnesium oxide insulated mineral cable, It is characterized in that It comprises a connection structure of a self-enclosed magnesium oxide insulated mineral cable as described in any one of claims 1 to 5.

7. A self-enclosed magnesium oxide insulated mineral cable according to claim 6, It is characterized in that The insulating filler (103) is made of magnesium oxide powder.

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