Low-voltage variable frequency cable

Abstract

The utility model relates to a low-voltage variable frequency cable, and relates to the technical field of cables, the low-voltage variable frequency cable comprises a protective sleeve, and three main lines and three ground wires which are arranged in the protective sleeve in a penetrating manner, the three main lines and the three ground wires are coated with a high-temperature-resistant layer, a plurality of connecting strips are uniformly distributed on the outer side wall of the high-temperature-resistant layer, and the connecting strips are connected with the inner side wall of the protective sleeve. According to the application, the high-temperature-resistant layer is coated outside the three main lines and the three ground lines, then the plurality of connecting strips are uniformly distributed and fixed on the high-temperature-resistant layer, and then the connecting strips are connected with the protective sleeve, so that the heat insulation work of the three main lines and the three ground lines is completed through the high-temperature-resistant layer and the gap between the high-temperature-resistant layer and the protective sleeve; the probability of adverse effects of external high temperature on the three main wires and the three ground wires is greatly reduced, the safety performance of the cable is improved, and the service life of the cable is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of cables, and in particular to a low-voltage variable-frequency cable. Background Art

[0002] Low-voltage frequency conversion cables are specially designed cables used to transmit power in low-voltage frequency conversion systems. These cables can handle the high-order harmonics and pulse voltages generated by the frequency converter, ensuring the stability and reliability of power transmission.

[0003] Conventional cables typically consist of a conductor, insulation layer, shielding layer, and outer jacket. The conductor is responsible for transmitting current. The insulation layer isolates the conductor from the external environment, preventing current leakage and electrical failure. The shielding layer reduces electromagnetic interference (EMI) and protects signal transmission from external interference. The outer jacket provides additional mechanical protection and corrosion resistance.

[0004] However, in the face of high temperature or fire environment, the outer sheath of the above-mentioned ordinary cables can easily soften and crack, which in turn causes other layers inside the cable to burn, resulting in short circuits or breaks in the circuit, and poor safety performance. Utility Model Content

[0005] In order to improve the fire safety performance of cables, the present application provides a low-voltage variable-frequency cable.

[0006] This application provides a low-voltage frequency conversion cable, which adopts the following technical solution:

[0007] A low-voltage frequency-converting cable comprises a protective sleeve and three main wires and three ground wires passed through the protective sleeve. The three main wires and three ground wires are covered with a high-temperature resistant layer. A plurality of connecting strips are evenly distributed on the outer wall of the high-temperature resistant layer, and the connecting strips are connected to the inner wall of the protective sleeve.

[0008] By adopting the above technical solution, a high-temperature resistant layer is wrapped around the three main wires and the three ground wires, and then a number of connecting strips are evenly distributed and fixed on the high-temperature resistant layer, and the connecting strips are connected to the protective cover. Thus, the three main wires and the three ground wires are thermally insulated through the high-temperature resistant layer and the gap between the high-temperature resistant layer and the protective cover, which greatly reduces the probability of adverse effects of external high temperature on the three main wires and the three ground wires, and improves the safety performance and life of the cable.

[0009] Optionally, a plurality of snap-fit ​​grooves are provided on the inner side wall of the protective cover, and one end of the connecting strip away from the high temperature resistant layer is snap-fitted with the snap-fit ​​groove.

[0010] By adopting the above technical solution, a snap-in groove is opened on the inner side wall of the protective cover, and the connecting strip is snap-fitted into the snap-in groove, thereby completing the connection between the connecting strip and the protective cover. When the protective cover is worn or broken, it is only necessary to pull the protective cover away from the broken part to separate the snap-in groove from the connecting strip and then replace it. It is convenient and fast, with high work efficiency and low replacement cost.

[0011] Optionally, the inner groove wall of the clamping groove is arranged in an arc shape, and the end of the connecting strip clamped with the clamping groove is also provided with an arc chamfer.

[0012] By adopting the above technical solution, the inner side wall of the snap-in groove is set to be arc-shaped, and a chamfer adapted to the inner side wall of the arc-shaped snap-in groove is opened on the connecting strip, so that the connecting strip is conveniently inserted into the snap-in groove, while increasing the contact area between the connecting strip and the protective cover, thereby improving the stability and firmness of the connection.

[0013] Optionally, the connecting strip is made of flame retardant material.

[0014] By adopting the above technical solution, the connecting strip is set to a connecting strip made of flame-retardant material. Therefore, when the protective cover is caught in high-temperature fire, the flame-retardant connecting strip and the gap between the high-temperature resistant layer and the protective cover are matched to isolate the flame from the high-temperature resistant layer, thereby reducing the probability of the three main wires and the three ground wires being damaged by the flame.

[0015] Optionally, the three main lines are provided with anti-compression rings, the three main lines are placed in a triangular state in the high-temperature resistant layer, and the three ground wires are respectively located between the anti-compression rings of two adjacent main lines.

[0016] By adopting the above technical solution, anti-pressure rings are arranged on the three main lines, so that the high-temperature resistant layer is supported by the three anti-pressure rings. At the same time, the ground wire is set between two adjacent anti-pressure rings, so that the two sides of the ground wire are supported and protected by the two adjacent anti-pressure rings, thereby improving the overall strength of the cable.

[0017] Optionally, the gaps between the interior of the high-temperature resistant layer and the three pressure-resistant rings and the three ground wires are filled with fireproof mud.

[0018] By adopting the above technical solution, fireproof mud is filled in the gap between the inside of the high-temperature resistant layer and the three pressure-resistant rings and the three ground wires. The fireproof mud fixes the relative positions of the three main wires and the three ground wires. At the same time, the presence of the fireproof mud also reduces the probability of the three main wires and the three ground wires being burned by flames, thereby protecting the three main wires and the three ground wires.

[0019] Optionally, a plurality of heat dissipation slots are evenly distributed on the outer side wall of the protective cover, and a plurality of heat dissipation holes are evenly distributed on the inner side wall of the heat dissipation slot.

[0020] By adopting the above technical solution, a heat dissipation groove is opened on the outer wall of the protective cover and a heat dissipation hole is opened in the heat dissipation groove, which helps the protective cover to dissipate heat in time when affected by high temperature, thereby reducing the probability of the three main wires and three ground wires inside the cable being affected by high temperature.

[0021] Optionally, the outer wall of the protective cover is coated with fluorescent coloring paint, and the fluorescent coloring paint has a significant color difference from the color of the inner material of the protective cover.

[0022] By adopting the above technical solution, fluorescent coloring paint is applied on the outer wall of the protective cover. Since there is a significant color difference between the fluorescent coloring paint and the inner material of the protective cover, when the protective cover is damaged or cracked, the staff can intuitively find the damaged part and then repair or replace it, which has high work efficiency. The fluorescent coloring paint also marks the position of the cable, reducing the probability of damage to the cable caused by external factors such as pedestrians or vehicles.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. By covering the three main wires and three ground wires with a high-temperature resistant layer, and then evenly distributing and fixing a number of connecting strips on the high-temperature resistant layer, and then connecting the connecting strips to the protective cover, the three main wires and three ground wires are thermally insulated through the high-temperature resistant layer and the gap between the high-temperature resistant layer and the protective cover, which greatly reduces the probability of adverse effects of external high temperature on the three main wires and three ground wires, and improves the safety performance and service life of the cable;

[0025] 2. By providing a snap-fit ​​groove on the inner side wall of the protective cover, the connecting strip is snapped into the snap-fit ​​groove, thereby completing the connection between the connecting strip and the protective cover. When the protective cover is worn or broken, it is only necessary to pull the protective cover away from the broken part to separate the snap-fit ​​groove from the connecting strip and then replace it. This is convenient and fast, with high work efficiency and low replacement cost.

[0026] 3. By applying fluorescent coloring paint on the outer wall of the protective cover, since there is a significant color difference between the fluorescent coloring paint and the internal material of the protective cover, when the protective cover is damaged or cracked, the staff can intuitively find the damaged part and then repair or replace it, which is highly efficient. In addition, the fluorescent coloring paint also marks the position of the cable, reducing the probability of damage to the cable caused by external factors such as pedestrians or vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the three-dimensional structure of this application;

[0028] Figure 2 It is a structural schematic diagram of the overall cross-section of the cable in this application.

[0029] Figure numerals: 1, protective cover; 11, main line; 12, ground line; 13, high temperature resistant layer; 14, connecting strip; 15, snap-in groove; 16, chamfer; 17, anti-pressure ring; 18, fireproof mud; 21, heat dissipation groove; 22, heat dissipation hole. DETAILED DESCRIPTION

[0030] The following is combined with Figure 1 -Attached Figure 2 This application is described in further detail.

[0031] The embodiment of the present application discloses a low-voltage frequency conversion cable.

[0032] Reference Figure 1 and Figure 2 The low-voltage frequency conversion cable includes a protective sheath 1 and three main wires 11 and three ground wires 12 passing through the protective sheath 1. The three main wires 11 and the three ground wires 12 are covered with a high-temperature resistant layer 13. A plurality of connecting strips 14 are evenly distributed and fixedly connected to the outer wall of the high-temperature resistant layer 13, and the connecting strips 14 are connected to the inner wall of the protective sheath 1.

[0033] Reference Figure 1 and Figure 2 A high-temperature resistant layer 13 is coated on the outside of the three main lines 11 and the three ground lines 12, and then a number of connecting strips 14 are evenly distributed and fixed on the high-temperature resistant layer 13, and the connecting strips 14 are connected to the protective cover 1, thereby completing the thermal insulation work of the three main lines 11 and the three ground lines 12 through the high-temperature resistant layer 13 and the gap between the high-temperature resistant layer 13 and the protective cover 1, greatly reducing the probability of adverse effects of external high temperature on the three main lines 11 and the three ground lines 12, and improving the safety performance and life of the cable.

[0034] Reference Figure 1 and Figure 2 The inner wall of the protective cover 1 is uniformly provided with a plurality of engaging grooves 15. The end of the connecting strip 14, away from the high-temperature resistant layer 13, engages with the engaging grooves 15. The inner groove wall of the engaging groove 15 is curved, and the end of the connecting strip 14 engaging the engaging groove 15 also has an arcuate chamfer 16 adapted to the inner groove wall of the engaging groove 15. The connecting strip 14 is made of flame-retardant material.

[0035] Reference Figure 1 and Figure 2 The connecting strip 14 is made of a flame-retardant material. Therefore, in the event of a high-temperature fire in the protective cover 1, the flame-retardant connecting strip 14 and the clearance between the high-temperature resistant layer 13 and the protective cover 1 isolate the flame from the high-temperature resistant layer 13, reducing the probability of damage to the three main wires 11 and the three ground wires 12 from the flame. Furthermore, if the protective cover 1 is damaged, it can be replaced by simply peeling the protective cover 1 away from the rupture to disengage the connecting slot 15 from the connecting strip 14. This is convenient and efficient.

[0036] Reference Figure 1 and Figure 2 The three main wires 11 are arranged in a triangle within the high-temperature resistant layer 13, with the three ground wires 12 located between two of the three main wires 11. A compression ring 17 is sleeved on the outer wall of the main wire 11. The three compression rings 17 cooperate to support the interior of the high-temperature resistant layer 13. The ground wire 12 is located between two adjacent compression rings 17. The two adjacent compression rings 17 support and protect both sides of the ground wire 12. The gaps between the interior of the high-temperature resistant layer 13 and the three compression rings 17 and the three ground wires 12 are filled with fireproof mud 18.

[0037] Reference Figure 1 and Figure 2 The outer wall of the protective cover 1 is evenly distributed with a plurality of heat dissipation grooves 21, and the inner wall of the heat dissipation grooves 21 is evenly distributed with a plurality of heat dissipation holes 22. The arrangement of the heat dissipation grooves 21 and the heat dissipation holes 22 increases the heat dissipation area of ​​the protective cover 1, thereby helping the protective cover 1 to dissipate heat in a timely manner when exposed to high temperatures.

[0038] Reference Figure 1 and Figure 2 The outer wall of the protective cover 1 is coated with a fluorescent paint that has a significant color difference from the inner material of the protective cover 1. Therefore, when the protective cover 1 is damaged or cracked, the staff can intuitively find the damaged part and then repair or replace it, which is highly efficient. The fluorescent paint also marks the location of the cable, reducing the probability of damage to the cable caused by external factors such as pedestrians or vehicles.

[0039] The working principle of the embodiment of this application is as follows:

[0040] A high-temperature resistant layer 13 is coated on the outside of the three main lines 11 and the three ground lines 12, and then a number of connecting strips 14 are evenly distributed and fixed on the high-temperature resistant layer 13, and the connecting strips 14 are connected to the protective cover 1, thereby completing the thermal insulation of the three main lines 11 and the three ground lines 12 through the high-temperature resistant layer 13 and the gap between the high-temperature resistant layer 13 and the protective cover 1, greatly reducing the probability of adverse effects of external high temperature on the three main lines 11 and the three ground lines 12, and improving the safety performance and service life of the cable.

[0041] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A low-voltage frequency conversion cable, characterized in that: The invention comprises a protective cover (1) and three main wires (11) and three ground wires (12) passing through the protective cover (1); the three main wires (11) and the three ground wires (12) are covered with a high-temperature resistant layer (13); a plurality of connecting strips (14) are evenly distributed on the outer wall of the high-temperature resistant layer (13); and the connecting strips (14) are connected to the inner wall of the protective cover (1).

2. The low-voltage frequency conversion cable according to claim 1, characterized in that: A plurality of snap-fit ​​grooves (15) are provided on the inner side wall of the protective cover (1), and one end of the connecting strip (14) away from the high-temperature resistant layer (13) is snap-fitted with the snap-fit ​​groove (15).

3. A low-voltage frequency conversion cable according to claim 2, characterized in that: The inner groove wall of the clamping groove (15) is arranged in an arc shape, and the end of the connecting strip (14) clamped with the clamping groove (15) is also provided with an arc chamfer (16).

4. The low-voltage frequency conversion cable according to claim 3, characterized in that: The connecting strip (14) is a connecting strip (14) made of a flame retardant material.

5. The low-voltage frequency conversion cable according to claim 1, characterized in that: The three main lines (11) are sleeved with anti-compression rings (17), and the three main lines (11) are placed in a triangular state in the high-temperature resistant layer (13). The three ground lines (12) are respectively located between the anti-compression rings (17) of two adjacent main lines (11).

6. The low-voltage frequency conversion cable according to claim 5, characterized in that: The gaps between the interior of the high-temperature resistant layer (13) and the three pressure-resistant rings (17) and the three ground wires (12) are filled with fireproof mud (18).

7. The low-voltage frequency conversion cable according to claim 1, characterized in that: A plurality of heat dissipation slots (21) are evenly distributed on the outer side wall of the protective cover (1), and a plurality of heat dissipation holes (22) are evenly distributed on the inner side wall of the heat dissipation slots (21).

8. The low-voltage frequency conversion cable according to claim 1, characterized in that: The outer wall of the protective cover (1) is coated with fluorescent coloring paint, and the fluorescent coloring paint has a significant color difference from the color of the inner material of the protective cover (1).

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