Intelligent 10kV medium voltage coal mine frequency conversion device frequency conversion cable

Abstract

The application discloses a kind of intelligent 10kV medium voltage coal mine frequency conversion device with frequency conversion cable, it is related to frequency conversion cable technical field, including cable main body, the cable main body includes outer sheath, the inner wall of outer sheath is fixed with aluminium plastic tape copper wire weaving shielding layer, the inside of aluminium plastic tape copper wire weaving shielding layer is equipped with multiple groups of insulation shielding layer, and the inner wall of multiple groups of insulation shielding layer is fixed with a group of power line core insulation layer respectively.The inner sheath is set, so that the inner sheath is wrapped in the outside of insulation shielding layer and ground wire core conductor, so that ground wire core conductor and insulation shielding layer do not rub between aluminium plastic tape copper wire weaving shielding layer, filler is set between multiple groups of insulation shielding layer, so that multiple groups of insulation shielding layer do not mutually abrade, improve the durability of entire frequency conversion cable, so that the integral shape of entire frequency conversion cable is stronger, improve the tensile capacity of frequency conversion cable.

Description

Technical Field

[0001] This invention relates to the field of frequency conversion cable technology, specifically to a smart 10kV medium-voltage coal mine frequency conversion cable. Background Technology

[0002] With the increasing industrial electricity load and the continuous improvement of automation in large industrial and mining enterprises, low-carbon environmental protection and energy conservation have become the main themes. The widespread use of high-power frequency converters, frequency converter motors, and various precision instruments has led to the generation of square waves and high-order harmonics in the main circuit power cables connecting frequency converters or frequency converter motors during the transmission of electrical energy. Therefore, frequency converter cables are used in coal mine frequency converter devices to avoid affecting the normal operation of other precision instruments.

[0003] A patent (publication number: CN203103001U) discloses a medium-voltage (8.7 / 10kV) variable frequency power cable, comprising three conductors. The three conductors are multiple copper wires twisted and compressed into a circular compacted copper conductor. The three conductors are sequentially covered with a conductor shielding layer, a cross-linked polyethylene insulation layer, an insulation shielding layer, a metal shielding layer, and an isolation layer. The three insulated wire cores after being covered with the isolation layer are arranged in a triangular shape to form the cable core. The cable core is covered with a protective layer. The protective layer consists of an electrostatic shielding layer, a low-smoke halogen-free flame-retardant inner sheath, an armor layer made of galvanized steel wire braid, and a low-smoke halogen-free flame-retardant outer sheath layer from the inside out. Through the special structural design of the protective layer, it effectively solves the problem of square waves and high-order harmonics generated during the transmission of electrical energy in the main circuit power cable of medium-voltage (8.7 / 10kV) variable frequency motors or frequency converters not being leaked.

[0004] However, the above technical solution still has certain defects. A galvanized steel wire wound armor layer is set between the low-smoke halogen-free flame-retardant outer sheath layer and the low-smoke halogen-free flame-retardant inner sheath layer, and an isolation layer is set inside the electrostatic shield. However, there is no filler between the low-smoke halogen-free flame-retardant outer sheath layer and the low-smoke halogen-free flame-retardant inner sheath layer. As a result, when the cable is subjected to external forces such as tension, the galvanized steel wire wound armor layer will rub against the low-smoke halogen-free flame-retardant outer sheath layer and the low-smoke halogen-free flame-retardant inner sheath layer, causing wear to occur between the low-smoke halogen-free flame-retardant outer sheath layer and the low-smoke halogen-free flame-retardant inner sheath layer. Similarly, wear will also occur between the isolation layer and the electrostatic shield layer. Therefore, a smart 10kV medium-voltage coal mine frequency converter cable is proposed. Summary of the Invention

[0005] Based on this, the purpose of the present invention is to provide a frequency conversion cable for a smart 10kV medium-voltage coal mine frequency converter, so as to solve the technical problem mentioned in the background that wear easily occurs between the low-smoke halogen-free flame-retardant outer sheath and the low-smoke halogen-free flame-retardant inner sheath.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a variable frequency cable for a smart 10kV medium-voltage coal mine variable frequency device, comprising a cable body, the cable body including an outer sheath, an aluminum-plastic tape and copper wire braided shielding layer fixedly sleeved on the inner wall of the outer sheath, multiple sets of insulating shielding layers sleeved inside the aluminum-plastic tape and copper wire braided shielding layer, a set of power core insulating layers fixedly sleeved on the inner wall of each of the multiple sets of insulating shielding layers, a conductor shielding layer fixedly sleeved inside the power core insulating layer, a power core body fixedly sleeved on the inner wall of the conductor shielding layer, multiple sets of ground core conductors sleeved on the inner wall of the aluminum-plastic tape and copper wire braided shielding layer, a monitoring core insulating layer fixedly sleeved on the inner wall of the ground core conductors, a monitoring core conductor fixedly sleeved on the inner wall of the monitoring core insulating layer, and multiple sets of ground core conductors surrounding the outside of the multiple sets of insulating shielding layers.

[0007] As a preferred technical solution of the intelligent 10kV medium-voltage coal mine frequency converter cable of the present invention, a filler is provided between the multiple sets of insulating shielding layers and the multiple sets of ground conductor cores, and an inner sheath is provided between the aluminum-plastic tape and copper wire braided shielding layer and the multiple sets of insulating shielding layers.

[0008] As a preferred technical solution of the intelligent 10kV medium-voltage coal mine frequency converter cable of the present invention, the end of the cable body is provided with a connecting component. The connecting component includes a first fixing sleeve, the first fixing sleeve is fixedly connected to one end of the outer sheath, the outer wall of the first fixing sleeve is rotatably connected to a threaded sleeve, the inner wall of the threaded sleeve is threadedly connected to a second fixing sleeve, and the inner wall of the second fixing sleeve is fitted with another set of outer sheaths.

[0009] As a preferred technical solution of the variable frequency cable for a smart 10kV medium-voltage coal mine variable frequency device of the present invention, one end of the insulating shielding layer is fixedly sleeved with a first connecting copper tube, and the end of the ground wire core conductor is fixedly sleeved with a second connecting copper tube.

[0010] As a preferred technical solution of the variable frequency cable for a smart 10kV medium-voltage coal mine variable frequency device of the present invention, a set of sliders is fixedly connected to the side walls of the first fixed sleeve and the second fixed sleeve respectively. The outer walls of the two sets of sliders are slidably fitted with fixed plates. The side walls of the fixed plates are slidably connected with side plates. The inner walls of the side plates are slidably connected with multiple sets of inclined blocks.

[0011] As a preferred technical solution for a variable frequency cable for an intelligent 10kV medium-voltage coal mine variable frequency device according to the present invention, one end of a support spring is fixedly connected to the side wall of each of the multiple sets of inclined blocks, and the other end of the support spring is fixedly connected to the inner wall of the side plate.

[0012] As a preferred technical solution of the variable frequency cable for a smart 10kV medium-voltage coal mine variable frequency device of the present invention, the inner wall of the fixed plate is rotatably connected with a bidirectional threaded rod extending to the outside of the fixed plate, and the outer wall of the bidirectional threaded rod is threadedly connected with two sets of push blocks. The side walls of the two sets of push blocks are respectively hinged with a set of top plates, and the ends of the two sets of top plates are hinged to the side walls of the side plates.

[0013] As a preferred technical solution of the variable frequency cable for a smart 10kV medium-voltage coal mine variable frequency device of the present invention, a hexagonal nut is fixedly connected to one end of the bidirectional threaded rod located outside the fixed plate, and the thread direction of the bidirectional threaded rod is opposite at the contact position with the two sets of push blocks.

[0014] As a preferred technical solution of the variable frequency cable for a smart 10kV medium-voltage coal mine variable frequency device of the present invention, a set of buffer installation components are respectively provided at the top and bottom of the fixed plate. The buffer installation components include a slide groove, which is opened on the side wall of the fixed plate. Two sets of fixed blocks are slidably connected to the inner wall of the slide groove. A top head extending into the slide groove is slidably connected to the inner wall of the fixed block. Multiple sets of grooves matching the top head are opened on the inner wall of the slide groove. One end of the top head located inside the fixed block is fixedly connected to one end of a return spring. The other end of the return spring is fixedly connected to the inner wall of the fixed block. Bolt holes are opened on the side wall of the fixed block.

[0015] In summary, the present invention has the following main beneficial effects:

[0016] 1. By setting an inner sheath, the inner sheath wraps around the outside of the insulating shielding layer and the ground conductor, thereby preventing friction between the ground conductor and the insulating shielding layer and the aluminum-plastic tape copper wire braided shielding layer. Filler is set between multiple sets of insulating shielding layers to prevent mutual wear between the multiple sets of insulating shielding layers, thereby improving the durability of the entire frequency conversion cable, making the overall shape of the frequency conversion cable stronger, and improving the tensile strength of the frequency conversion cable.

[0017] 2. This invention connects the threaded sleeve on one set of cable bodies to the second fixed sleeve on another set of cable bodies, allowing the two sets of cable bodies to be quickly connected together. The two sets of sliders are then fixed by a fixing plate, making it less likely for the connection between the two sets of cable bodies to be bent, thus preventing the connection from breaking after the two sets of cable bodies are connected together.

[0018] 3. This invention uses bolts to fix the fixing block to the equipment or wall, so that the cable body is fixed and will not fall to the ground. When the cable body is pulled, the fixing block slides on the fixing plate, so that the top is continuously pushed, thereby consuming and buffering the pulling force and preventing the cable body from breaking when accidentally pulled. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the main structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the internal structure of the cable body of the present invention;

[0021] Figure 3 This is a schematic diagram of the rear cross-sectional structure of the fixing plate of the present invention;

[0022] Figure 4 This is a schematic diagram of the connection structure between the two sets of cable bodies of the present invention;

[0023] Figure 5 This is a schematic diagram of the main cross-sectional structure of the fixing plate of the present invention;

[0024] Figure 6 This is a side view of the structure of the present invention;

[0025] Figure 7 This is a schematic cross-sectional view of the fixing block structure of the present invention.

[0026] In the diagram: 1. Cable body; 2. Connecting assembly; 3. Buffer mounting assembly;

[0027] 101. Outer sheath; 102. Aluminum-plastic tape and copper wire braided shielding layer; 103. Inner sheath; 104. Insulating shielding layer; 105. Power core insulation layer; 106. Conductor shielding layer; 107. Power core body; 108. Ground core conductor; 109. Monitoring core insulation layer; 110. Monitoring core conductor; 111. Filler;

[0028] 201. First fixing sleeve; 202. Second fixing sleeve; 203. Threaded sleeve; 204. First connecting copper pipe; 205. Second connecting copper pipe; 206. Sliding block; 207. Fixing plate; 208. Side plate; 209. Inclined block; 210. Support spring; 211. Double-ended threaded rod; 212. Pushing block; 213. Top plate;

[0029] 301. Slide groove; 302. Fixing block; 303. Top head; 304. Groove; 305. Return spring; 306. Bolt hole. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0031] The embodiments of the present invention will now be described.

[0032] A type of intelligent 10kV medium-voltage coal mine frequency converter cable, such as Figures 1 to 7 As shown, the cable includes a cable body 1, which includes an outer sheath 101. An aluminum-plastic tape and copper wire braided shielding layer 102 is fixedly fitted onto the inner wall of the outer sheath 101. Multiple sets of insulating shielding layers 104 are fitted inside the aluminum-plastic tape and copper wire braided shielding layer 102. A set of power core insulation layers 105 is fixedly fitted onto the inner wall of each of the multiple sets of insulating shielding layers 104. A conductor shielding layer 106 is fixedly fitted inside the power core insulation layer 105. A power core body 107 is fixedly fitted onto the inner wall of the conductor shielding layer 106. The aluminum-plastic tape and copper wire braided shielding layer... The inner wall of the shielding layer 102 is fitted with multiple sets of ground conductor cores 108. The inner wall of the ground conductor cores 108 is fixedly fitted with a monitoring conductor core insulation layer 109. The inner wall of the monitoring conductor core insulation layer 109 is fixedly fitted with a monitoring conductor core 110. The multiple sets of ground conductor cores 108 surround the outside of the multiple sets of insulating shielding layers 104. A filler 111 is provided between the multiple sets of insulating shielding layers 104 and the multiple sets of ground conductor cores 108. An inner sheath 103 is provided between the aluminum-plastic tape and copper wire braided shielding layer 102 and the multiple sets of insulating shielding layers 104.

[0033] The outer sheath 101 provides overall protection for the entire cable body 1, preventing scratches on the internal materials. The aluminum-plastic tape and copper wire braided shielding layer 102 reduces the influence of square waves and high-order harmonics, and improves the overall strength of the cable body 1. The conductor shielding layer 106 and the power core insulation layer 105 outside the power core further improve insulation performance and wave resistance. The monitoring core insulation layer 109 outside the monitoring core conductor 110 improves the insulation performance of the monitoring core. The inner sheath 103 wraps around the insulation shielding layer 104 and the ground core conductor 108, preventing friction between the ground core conductor 108 and the insulation shielding layer 104 and the aluminum-plastic tape and copper wire braided shielding layer 102. The filler 111 between the multiple sets of insulation shielding layers 104 prevents mutual wear between the multiple sets of insulation shielding layers 104, improving the durability of the entire frequency conversion cable, making the entire frequency conversion cable stronger and improving the tensile strength of the frequency conversion cable.

[0034] Please refer to this carefully. Figures 2 to 5A connecting assembly 2 is provided at the end of the cable body 1. The connecting assembly 2 includes a first fixing sleeve 201, which is fixedly connected to one end of an outer sheath 101. A threaded sleeve 203 is rotatably connected to the outer wall of the first fixing sleeve 201. A second fixing sleeve 202 is threadedly connected to the inner wall of the threaded sleeve 203. Another set of outer sheaths 101 is sleeved on the inner wall of the second fixing sleeve 202. A first connecting copper tube 204 is fixedly sleeved at one end of the insulating shielding layer 104. A second connecting copper tube 205 is fixedly sleeved at the end of the ground conductor 108. A set of sliders 206 are fixedly connected to the side walls of the first fixing sleeve 201 and the second fixing sleeve 202, respectively. A fixing plate 207 is slidably sleeved on the outer wall of the two sets of sliders 206. The side walls of the fixing plate 207 are slidably connected to... There is a side plate 208, and multiple sets of inclined blocks 209 are slidably connected to the inner wall of the side plate 208. One end of a support spring 210 is fixedly connected to the side wall of each set of inclined blocks 209. The other end of the support spring 210 is fixedly connected to the inner wall of the side plate 208. A bidirectional threaded rod 211 extending to the outside of the fixed plate 207 is rotatably connected to the inner wall of the fixed plate 207. Two sets of push blocks 212 are threadedly connected to the outer wall of the bidirectional threaded rod 211. A set of top plates 213 are hinged to the side wall of each set of push blocks 212. The ends of the two sets of top plates 213 are hinged to the side wall of the side plate 208. A hexagonal nut is fixedly connected to the end of the bidirectional threaded rod 211 located outside the fixed plate 207. The threads of the bidirectional threaded rod 211 at the contact position with the two sets of push blocks 212 are in opposite directions.

[0035] By pushing the sliders 206 on the two sets of cable bodies 1 into the side wall of the fixing plate 207, and by pushing the two sets of sliders 206 closer to each other, the power core body 107 and monitoring core conductor 110 on one set of cable bodies 1 are inserted into the first connecting copper tube 204 and the second connecting copper tube 205 on the other set of cable bodies 1. Then, the threaded sleeve 203 is rotated so that the threaded sleeve 203 is threaded to the outside of the second fixing sleeve 202, thereby making the two sets of cable bodies 1 tightly connected together. When the sliders 206 slide into the fixing plate 207, the sliders 206 push the inclined blocks 209, causing the inclined blocks 209 to compress the support spring 210. After the sliders 206 pass over a set of inclined blocks 209, the support spring 210 rebounds and pushes the set of inclined blocks 209 to reset. At this time, if the two sets of sliders 206 are pushed away from each other, the inclined blocks next to the two sets of sliders 206 will be... Block 209 blocks the two sets of inclined blocks 209, preventing them from moving away from each other and thus preventing the two sets of cable bodies 1 from separating. Furthermore, the connection between slider 206 and fixed plate 207 increases the strength of the connection between the two sets of cable bodies 1, making it less prone to breakage. When it is necessary to separate the two sets of cable bodies 1, rotating the bidirectional threaded rod 211 pushes the connecting push block 212 away from each other, causing the two push blocks 212 to pull the two sets of top plates 213 respectively. This causes the side plate 208 to slide into the fixed plate 207, which in turn causes the fixed plate 207 to move the inclined block 209, preventing the inclined block 209 from contacting the slider 206. At this point, rotating the threaded sleeve 203 in the opposite direction separates the threaded sleeve 203 from the second fixed sleeve 202, allowing the two sets of cable bodies 1 to be separated.

[0036] Please refer to this carefully. Figure 6 and Figure 7 A set of buffer mounting components 3 are respectively provided at the top and bottom of the fixed plate 207. The buffer mounting components 3 include a slide groove 301. The slide groove 301 is opened in the side wall of the fixed plate 207. Two sets of fixing blocks 302 are slidably connected to the inner wall of the slide groove 301. A top head 303 extending into the slide groove 301 is slidably connected to the inner wall of the fixing block 302. Multiple sets of grooves 304 that match the top head 303 are opened in the inner wall of the slide groove 301. One end of the top head 303 located inside the fixing block 302 is fixedly connected to one end of the return spring 305. The other end of the return spring 305 is fixedly connected to the inner wall of the fixing block 302. Bolt holes 306 are opened in the side wall of the fixing block 302.

[0037] By using bolts to pass through bolt holes 306, and then fixing block 302 to a wall or other high place, the cable body 1 is fixed and not easily touched. When the cable body 1 is accidentally pulled, the fixing plate 207 and fixing block 302 slide, causing the top head 303 to be pushed by the groove 304, thereby pushing the top head 303 to compress the return spring 305. When the top head 303 is aligned with another set of grooves 304, the return spring 305 pushes the top head 303 to return to its original position. At this time, the top head 303 slides into the other set of grooves 304. By using the sliding between fixing plate 207 and fixing block 302, the return spring 305 is continuously compressed and rebounded, thereby consuming the force pulling the cable body 1 and preventing the cable body 1 from being pulled apart.

[0038] In use, by setting an inner sheath 103, the inner sheath 103 wraps around the outside of the insulating shielding layer 104 and the ground conductor 108, thereby preventing friction between the ground conductor 108 and the insulating shielding layer 104 and the aluminum-plastic tape copper wire braided shielding layer 102. Filler 111 is provided between multiple sets of insulating shielding layers 104 to prevent mutual wear between the multiple sets of insulating shielding layers 104, thereby improving the durability of the entire frequency conversion cable, making the overall shape of the frequency conversion cable stronger, and improving the tensile strength of the frequency conversion cable. The parts not involved in this device are the same as or can be implemented using existing technologies.

[0039] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the invention and are not intended to limit it. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the invention, but such modifications, substitutions, and variations are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A variable frequency cable for a smart 10kV medium-voltage coal mine variable frequency device, comprising a cable body (1), characterized in that: The cable body (1) includes an outer sheath (101). An aluminum-plastic tape and copper wire braided shielding layer (102) is fixedly fitted onto the inner wall of the outer sheath (101). Multiple sets of insulating shielding layers (104) are fitted inside the aluminum-plastic tape and copper wire braided shielding layer (102). A set of power core insulation layers (105) is fixedly fitted onto the inner wall of each of the multiple sets of insulating shielding layers (104). A conductor shielding layer (106) is fixedly fitted inside the power core insulation layer (105). The inner wall of the shielding layer (106) is fixedly fitted with a power core body (107), the inner wall of the aluminum-plastic strip copper wire braided shielding layer (102) is fitted with multiple sets of ground core conductors (108), the inner wall of the ground core conductors (108) is fixedly fitted with a monitoring core insulation layer (109), the inner wall of the monitoring core insulation layer (109) is fixedly fitted with a monitoring core conductor (110), and the multiple sets of ground core conductors (108) surround the outside of the multiple sets of insulating shielding layers (104); The cable body (1) is provided with a connecting component (2) at its end. The connecting component (2) includes a first fixing sleeve (201), which is fixedly connected to one end of an outer sheath (101). The outer wall of the first fixing sleeve (201) is rotatably connected to a threaded sleeve (203). The inner wall of the threaded sleeve (203) is threadedly connected to a second fixing sleeve (202). The inner wall of the second fixing sleeve (202) is fitted with another set of outer sheaths (101). The first fixed sleeve (201) and the second fixed sleeve (202) are respectively fixedly connected to a set of sliders (206). The outer walls of the two sets of sliders (206) are slidably fitted with fixed plates (207). The side walls of the fixed plates (207) are slidably connected with side plates (208). The inner walls of the side plates (208) are slidably connected with multiple sets of inclined blocks (209).

2. The frequency conversion cable for an intelligent 10kV medium-voltage coal mine frequency converter according to claim 1, characterized in that: A filler (111) is provided between the multiple sets of insulating shielding layers (104) and the multiple sets of ground conductor cores (108), and an inner sheath (103) is provided between the aluminum-plastic tape copper wire braided shielding layer (102) and the multiple sets of insulating shielding layers (104).

3. The frequency conversion cable for an intelligent 10kV medium-voltage coal mine frequency converter according to claim 1, characterized in that: One end of the insulating shielding layer (104) is fixedly fitted with a first connecting copper tube (204), and the end of the ground wire core conductor (108) is fixedly fitted with a second connecting copper tube (205).

4. The frequency conversion cable for an intelligent 10kV medium-voltage coal mine frequency converter according to claim 3, characterized in that: The side walls of the multiple sets of inclined blocks (209) are respectively fixedly connected to one end of a support spring (210), and the other end of the support spring (210) is fixedly connected to the inner wall of the side plate (208).

5. The frequency conversion cable for an intelligent 10kV medium-voltage coal mine frequency converter according to claim 1, characterized in that: The inner wall of the fixed plate (207) is rotatably connected to a bidirectional threaded rod (211) extending to the outside of the fixed plate (207). The outer wall of the bidirectional threaded rod (211) is threadedly connected to two sets of push blocks (212). The side walls of the two sets of push blocks (212) are respectively hinged to a set of top plates (213). The ends of the two sets of top plates (213) are hinged to the side walls of the side plate (208).

6. The frequency conversion cable for an intelligent 10kV medium-voltage coal mine frequency converter according to claim 5, characterized in that: The bidirectional threaded rod (211) is fixedly connected to a hexagonal nut at one end outside the fixed plate (207). The bidirectional threaded rod (211) has opposite thread directions at the contact positions with the two sets of push blocks (212).

7. The frequency conversion cable for an intelligent 10kV medium-voltage coal mine frequency converter according to claim 1, characterized in that: The top and bottom ends of the fixed plate (207) are respectively provided with a set of buffer mounting components (3). The buffer mounting components (3) include a slide groove (301). The slide groove (301) is opened on the side wall of the fixed plate (207). The inner wall of the slide groove (301) is slidably connected to two sets of fixing blocks (302). The inner wall of the fixing block (302) is slidably connected to a top head (303) extending into the slide groove (301). The inner wall of the slide groove (301) is provided with multiple sets of grooves (304) that match the top head (303). One end of the top head (303) located inside the fixing block (302) is fixedly connected to one end of a return spring (305). The other end of the return spring (305) is fixedly connected to the inner wall of the fixing block (302). The side wall of the fixing block (302) is provided with bolt holes (306).

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