Flame-retardant variable-frequency power cable

Abstract

The utility model discloses a flame-retardant variable-frequency power cable, which belongs to the technical field of power cables and comprises a wear-resistant layer, a protective layer is sleeved in the wear-resistant layer, a flame-retardant layer is sleeved in the protective layer, limiting pieces distributed in an array are slidably arranged on the protective layer, and the sliding direction of the limiting pieces is perpendicular to the axis of the cable. A plurality of first limiting grooves are formed in the inner wall of the protective layer, mounting holes communicating with the wear-resistant layer are formed in the first limiting grooves, a plurality of second limiting grooves are formed in the inner wall of the wear-resistant layer, and the second limiting grooves correspond to the mounting holes one to one; a first limiting block is fixed at one end of the mounting shaft close to the cable axis, and a second limiting block is fixed at the other end. When the cable is produced, after the wear-resistant layer, the protective layer and the flame-retardant layer are sleeved, the supporting particles are firstly filled between the protective layer and the flame-retardant layer, and after filling is completed, the corresponding second limiting blocks are clamped into the corresponding second limiting grooves under extrusion of the supporting particles.

Description

Technical Field

[0001] The utility model belongs to the technical field of power cables, and in particular relates to a flame-retardant variable frequency power cable. Background Art

[0002] The structure of the frequency conversion cable includes multiple main line insulated wires and multiple neutral line insulated wires. An inner winding layer, a copper tape layer, an outer winding layer and an outer sheath layer are arranged in sequence outside the main line insulated wire and the neutral line insulated wire to form a 3+3 insulated wire structure, and then the outside of the main line insulated wire and the neutral line insulated wire are covered with a fireproof layer and an external wire sheath.

[0003] Traditional frequency conversion cables will inevitably generate a lot of friction during laying or transportation, which can easily wear off the outer sheath. Once the outer sheath is broken, it will be easily peeled off from the inside of the cable when it is rubbed again, making it difficult to remedy the situation during subsequent use, resulting in waste of the cable. In order to solve the above problems, a flame retardant frequency conversion power cable is provided.

[0004] It should be noted that the above contents belong to the technical knowledge of the inventor and do not necessarily constitute prior art. Utility Model Content

[0005] In order to solve the above problems, the purpose of the utility model is to provide a flame-retardant variable frequency power cable. During production, after the wear-resistant layer, the protective layer and the flame-retardant layer are assembled, supporting particles are first filled between the protective layer and the flame-retardant layer. After the filling is completed, under the extrusion of the supporting particles, the corresponding second limit block is inserted into the corresponding second limit groove to achieve the limitation between the wear-resistant layer and the protective layer, avoid the wear-resistant layer from being peeled off under non-human influence, and greatly enhance the stability of the cable.

[0006] To achieve the above-mentioned purpose, the utility model proposes a flame-retardant variable-frequency power cable, the cable comprising a wear-resistant layer, a protective layer is sheathed in the wear-resistant layer, a flame-retardant layer is sheathed in the protective layer, and an array of limiting members are slidably provided on the protective layer, and the sliding direction of the limiting members is perpendicular to the axis of the cable.

[0007] The inner wall of the protective layer is provided with a plurality of first limiting grooves, the first limiting grooves are provided with mounting holes connected to the wear-resistant layer, and the inner wall of the wear-resistant layer is provided with a plurality of second limiting grooves, the second limiting grooves correspond to the mounting holes one by one.

[0008] The limiting component comprises a mounting shaft sliding in the mounting hole, a first limiting block is fixed to one end of the mounting shaft close to the cable axis, and a second limiting block is fixed to the other end of the mounting shaft.

[0009] Furthermore, support particles are filled between the wear-resistant layer and the protective layer, and between the protective layer and the flame-retardant layer.

[0010] Furthermore, the inner wall of the wear-resistant layer is fixed with limiting slots distributed in an array, and the outer wall of the protective layer is fixed with limiting strips distributed in an array. The limiting strips are inserted into the corresponding limiting slots, and the limiting strips are parallel to the axis of the cable.

[0011] Furthermore, a connecting sleeve is provided at the center of the flame retardant layer, a guide steel wire is provided at the center of the connecting sleeve, a plurality of first dividing strips are provided between the connecting sleeve and the flame retardant layer, and an insulating wire is provided between two adjacent first dividing strips.

[0012] Furthermore, the outside of the insulated wire is wrapped with a fireproof sleeve.

[0013] Furthermore, flame retardant particles are filled between the flame retardant layer and the connecting pipe sleeve.

[0014] Furthermore, both side edges of the second limiting block close to the second limiting groove are chamfered.

[0015] Furthermore, a plurality of second dividing strips are provided between the protective layer and the flame retardant layer, and the second dividing strips and the limiting members are distributed in an alternating manner.

[0016] The flame-retardant variable frequency power cable proposed by the utility model can bring the following beneficial effects:

[0017] 1. When the utility model cable is produced, after the wear-resistant layer, the protective layer and the flame-retardant layer are assembled, the support particles are first filled between the protective layer and the flame-retardant layer. After the filling is completed, under the extrusion of the support particles, the corresponding second limit block is inserted into the corresponding second limit groove to achieve the limit between the wear-resistant layer and the protective layer, avoiding the wear-resistant layer from being peeled off under non-human action, and greatly enhancing the stability of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0019] Figure 1 The utility model is a schematic diagram of the cross-sectional structure of a flame-retardant variable frequency power cable.

[0020] Figure 2 for Figure 1 Enlarged structural diagram at A in the middle.

[0021] Figure 3 It is a structural schematic diagram of the insulated wire of the utility model.

[0022] Figure 4 The utility model is a schematic diagram of the longitudinal section structure of a flame-retardant variable frequency power cable.

[0023] Figure 5 for Figure 1 Enlarged structural diagram at point C in the middle.

[0024] In the figure: 1. wear-resistant layer; 2. protective layer; 3. flame-retardant layer; 4. supporting particles; 5. connecting pipe sleeve; 6. first dividing strip; 7. insulating wire; 8. limiting piece; 9. second dividing strip; 10. flame-retardant particles; 20, 11. limiting slot; 12. second limiting slot; 21. limiting strip; 22. first limiting slot; 23. mounting hole; 71. fireproof sleeve; 81. mounting shaft; 82. first limiting block; 83. second limiting block. DETAILED DESCRIPTION

[0025] In order to more clearly illustrate the overall concept of the present invention, a detailed description is given below in the form of examples in conjunction with the accompanying drawings.

[0026] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. 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, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0028] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like 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, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In the present utility model, unless otherwise clearly specified and limited, the first feature "above" or "below" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "one scheme", "some schemes", "examples", "specific examples" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the scheme or example are included in at least one scheme or example of the present utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same scheme or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more schemes or examples.

[0030] The embodiment of the utility model provides a flame retardant variable frequency power cable, the cable comprises a wear-resistant layer 1, such as Figure 1 As shown, the wear-resistant layer 1 is sheathed with a protective layer 2, the protective layer 2 is sheathed with a flame-retardant layer 3, a connecting sleeve 5 is arranged at the center of the flame-retardant layer 3, a guide steel wire 20 is arranged at the center of the connecting sleeve 5, a plurality of first dividing strips 6 are arranged between the connecting sleeve 5 and the flame-retardant layer 3, an insulating wire 7 is arranged between two adjacent first dividing strips 6, and the outside of the insulating wire 7 is wrapped with a fireproof sleeve 71, as shown in FIG. Figure 3 As shown, flame retardant particles 10 are filled between the flame retardant layer 3 and the connecting pipe sleeve 5 , and supporting particles 4 are filled between the wear-resistant layer 1 and the protective layer 2 and between the protective layer 2 and the flame retardant layer 3 .

[0031] The inner wall of the wear-resistant layer 1 is fixed with an array of limit slots 11, such as Figure 2 As shown, the outer wall of the protective layer 2 is fixed with limiting strips 21 distributed in an array, and the limiting strips 21 are inserted into corresponding limiting slots 11, and the limiting strips 21 are parallel to the axis of the cable.

[0032] The protective layer 2 is provided with a plurality of stoppers 8 arranged in an array. Figure 4 As shown, the sliding direction of the limiting member 8 is perpendicular to the axis of the cable.

[0033] The inner wall of the protective layer 2 is provided with a plurality of first limiting grooves 22, such as Figure 5 As shown, a mounting hole 23 communicating with the wear-resistant layer 1 is provided in the first limiting groove 22 , and a plurality of second limiting grooves 12 are provided on the inner wall of the wear-resistant layer 1 , and the second limiting grooves 12 correspond to the mounting holes 23 one by one.

[0034] The limiting member 8 includes a mounting shaft 81 sliding in the mounting hole 23 , a first limiting block 82 is fixed to one end of the mounting shaft 81 close to the cable axis, and a second limiting block 83 is fixed to the other end. Both side edges of the second limiting block 83 close to the second limiting groove 12 are chamfered.

[0035] A plurality of second dividing strips 9 are provided between the protective layer 2 and the flame retardant layer 3 , and the second dividing strips 9 and the limiting members 8 are distributed in an alternating manner.

[0036] Working principle: When producing the cable, after the wear-resistant layer 1, the protective layer 2 and the flame-retardant layer 3 are assembled, the supporting particles 4 are first filled between the protective layer 2 and the flame-retardant layer 3. During filling, the side of the limiting piece 8 at the filling position on the cable can be facing downward. After the filling is completed, under the extrusion of the supporting particles 4, the corresponding second limiting block 83 is inserted into the corresponding second limiting groove 12 to achieve the limitation between the wear-resistant layer 1 and the protective layer 2, avoiding the wear-resistant layer 1 from peeling off due to non-human influence, and then the supporting particles 4 are filled between the wear-resistant layer 1 and the protective layer 2.

[0037] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0038] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims

1. A flame-retardant variable frequency power cable, the cable comprising a wear-resistant layer (1), characterized in that: The wear-resistant layer (1) is sheathed with a protective layer (2), the protective layer (2) is sheathed with a flame-retardant layer (3), and the protective layer (2) is slidably provided with an array of limiters (8), the sliding direction of the limiters (8) being perpendicular to the axis of the cable; The inner wall of the protective layer (2) is provided with a plurality of first limiting grooves (22), the first limiting grooves (22) are provided with mounting holes (23) communicating with the wear-resistant layer (1), and the inner wall of the wear-resistant layer (1) is provided with a plurality of second limiting grooves (12), the second limiting grooves (12) corresponding to the mounting holes (23) one by one; The limiting member (8) comprises a mounting shaft (81) slidably located in the mounting hole (23); a first limiting block (82) is fixed to one end of the mounting shaft (81) close to the cable axis, and a second limiting block (83) is fixed to the other end.

2. A flame-retardant variable frequency power cable according to claim 1, characterized in that: Support particles (4) are filled between the wear-resistant layer (1) and the protective layer (2), and between the protective layer (2) and the flame-retardant layer (3).

3. A flame-retardant variable frequency power cable according to claim 2, characterized in that: The inner wall of the wear-resistant layer (1) is fixed with limiting slots (11) distributed in an array, and the outer wall of the protective layer (2) is fixed with limiting strips (21) distributed in an array. The limiting strips (21) are inserted into corresponding limiting slots (11), and the limiting strips (21) are parallel to the axis of the cable.

4. A flame-retardant variable frequency power cable according to claim 3, characterized in that: A connecting sleeve (5) is provided at the center of the flame retardant layer (3), a guide steel wire (20) is provided at the center of the connecting sleeve (5), a plurality of first dividing strips (6) are provided between the connecting sleeve (5) and the flame retardant layer (3), and an insulating wire (7) is provided between two adjacent first dividing strips (6).

5. A flame-retardant variable frequency power cable according to claim 4, characterized in that: The outside of the insulated wire (7) is wrapped with a fireproof sleeve (71).

6. A flame-retardant variable frequency power cable according to claim 5, characterized in that: Flame retardant particles (10) are filled between the flame retardant layer (3) and the connecting pipe sleeve (5).

7. A flame-retardant variable frequency power cable according to claim 6, characterized in that: Both side edges of the second limiting block (83) close to the second limiting groove (12) are chamfered.

8. The flame-retardant variable frequency power cable according to claim 7, characterized in that: A plurality of second dividing strips (9) are provided between the protective layer (2) and the flame retardant layer (3), and the second dividing strips (9) and the limiting members (8) are arranged in an alternating manner.

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