insulating bushing

Abstract

Disclosed herein is an insulating bushing suitable for protecting a busbar and having improved waterproof performance. The insulating bushing includes a first bushing provided with a first bushing passage through which a busbar passes, a second bushing provided with a first bushing receiving part that receives an upper part of a lower part of the first bushing inserted through the first bushing receiving part and a second bushing passage through which the busbar passes, and a cover coupled to an outer surface of the second bushing and provided with a cover passage through which the busbar passes, the second bushing including a second bushing body that protrudes from a lower part of the second bushing body in a lateral direction of the second bushing body to surround the lower part of the second bushing body and a second bushing flange formed with a plurality of second bushing bolt holes, including a second bushing flange long side and a second bushing flange short side according to a shape of the second bushing passage, the second bushing flange long side having an M shape with peaks and valleys.

Description

[0001] Cross-references to related applications

[0002] This patent document claims priority and benefit to Korean Patent Application No. 10-2021-0117182, filed on September 2, 2021, the entire disclosure of which is incorporated herein by reference for all purposes as fully set forth herein. Technical Field

[0003] This invention relates to insulating bushings, and more particularly to insulating bushings suitable for protecting conductive busbars used for electrical connections in switchboards, transformers, circuit breakers, energy storage devices, etc., installed outdoors and exposed to external environmental conditions such as snow, rain, and wind. Background Technology

[0004] Busbars are typically made of copper and used for electrical connections in switchboards, transformers, circuit breakers, energy storage devices, etc. In particular, conventional wires cannot be used to maintain a stable current in high-voltage environments, and rectangular or circular busbars with large cross-sectional areas are commonly used in this field.

[0005] When using busbars under applied voltage, the possibility of electrical interference and accidents is high if a constant insulation distance cannot be maintained between the busbar and the facility or other external devices. To address this problem, the outer surface of the busbar is coated with an insulator such as silicone resin or polyethylene, or it is surrounded by insulating tape, in order to keep the busbar in an insulated state.

[0006] However, because the insulator or insulating tape may peel off from the surface of the busbar over time due to friction or reduced bond strength, the insulator or insulating tape cannot fully perform its original function of reducing electrical interference / resistance while preventing electrical accidents, especially when exposed to the external environment.

[0007] Therefore, when the busbar is pulled in and out of the corresponding facility, the insulating bushing is used to protect the busbar from damage and to prevent it from being flooded by rain, electric shock, fire accidents and other accidents.

[0008] However, as disclosed in U.S. Patent No. 6,376,772 (granted April 23, 2002), typical insulating bushings made of nylon, polyamide, etc., exhibit weak flame retardancy and heat resistance, and have a low melting point due to their material properties, thus providing deficiencies in shape and dimensional management due to shape deformation. Furthermore, typical insulating bushings require the formation of cavities and / or slits due to their material properties, which leads to a deterioration in manufacturing efficiency, durability, and waterproof rating (IPX5).

[0009] Accordingly, there is a need to develop an insulating bushing capable of satisfying high insulation performance while realizing improvement in various properties including waterproof property, weather resistance, flame retardancy, etc. SUMMARY

[0010] Embodiments of the present application aim to solve such problems in the art, and an object of the present application is to provide an insulating bushing capable of satisfying high insulation performance while realizing improvement in mechanical and chemical properties such as waterproof property, weather resistance, flame retardancy, etc.

[0011] It should be understood that the present application is not limited to the above objects, and the above objects and other objects of the present application will become apparent to those skilled in the art from the following detailed description of embodiments, when read in light of the accompanying drawings.

[0012] According to an aspect of the present application, there is provided an insulating bushing adapted to protect a busbar and having improved waterproof property, the insulating bushing including: a first bushing provided with a first bushing passage through which a busbar passes; a second bushing provided with a first bushing receiving portion that receives an upper portion of the first bushing inserted through a lower portion of the first bushing receiving portion and a second bushing passage through which the busbar passes; and a cover coupled to an outer surface of the second bushing and provided with a cover passage through which the busbar passes, wherein the second bushing includes: a second bushing body and a second bushing flange protruding from a lower portion of the second bushing body in a lateral direction of the second bushing body to surround the lower portion of the second bushing body, and the second bushing flange is formed with a plurality of second bushing bolt holes, the second bushing flange includes a second bushing flange long side portion and a second bushing flange short side portion according to a shape of the second bushing passage, and the second bushing flange long side portion has an M shape with a peak portion and a valley portion.

[0013] The insulating bushing according to one embodiment of the present application satisfies high insulation performance while realizing improvement in waterproof property and durability.

[0014] The insulating bushing according to one embodiment of the present application not only exhibits good mechanical properties, but also exhibits good chemical properties including weather resistance, flame retardancy, etc. BRIEF DESCRIPTION OF DRAWINGS

[0015] The above and other aspects, features and advantages of the present application will become apparent from the following detailed description, taken in conjunction with the accompanying drawings, which illustrate

[0016] Figure 1 is a top perspective view of an insulating bushing according to one embodiment of the present application;

[0017] Figure 2is an exploded perspective view of an insulating bushing according to an embodiment of the present invention;

[0018] Figure 3 is a view of a second bushing of an insulating bushing according to an embodiment of the present invention;

[0019] Figure 4 is a bottom perspective view of an insulating bushing according to an embodiment of the present invention;

[0020] Figure 5 is a view of a cover of an insulating bushing according to an embodiment of the present invention;

[0021] Figure 6 is a top view of an insulating bushing according to an embodiment of the present invention;

[0022] Figure 7 is a perspective view of a first bushing of an insulating bushing according to an embodiment of the present invention;

[0023] Figure 8 is a bottom perspective view of an insulating bushing according to an embodiment of the present invention; and

[0024] Figure 9 is a cross-sectional view taken along line C1-C1 in Figure 4 . DETAILED DESCRIPTION

[0025] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. It is to be understood that the invention can be embodied in various ways and that the invention should not be limited to the following embodiments, and the following embodiments are given by way of illustration to provide a thorough understanding of the invention to those skilled in the art.

[0026] Herein, when an element is referred to as being "on" or "under" another element, it can be directly on or under the other element, or one or more intervening elements can be present. In addition, spatial relative terms, such as "upper" and "lower", are defined with reference to the accompanying drawings. Accordingly, it will be understood that "upper" can be used interchangeably with "lower".

[0027] Herein, throughout the drawings, the same parts are designated by the same reference numerals. In addition, when used in the literal part of the present application document, the terms "include", "comprise", "contain", "have", and the like designate the presence of the stated features, integers, steps, operations, elements, parts, and / or groups thereof, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts, and / or groups thereof.

[0028] Herein, the horizontal direction refers to a lateral direction in which the second bushing flange extends from the second bushing body.

[0029] In this context, in a plan view of the insulating bush, the inner side refers to the side close to the center, and the outer side refers to the side away from the center.

[0030] Hereinafter, an embodiment of the present application will be described with reference to the accompanying drawings.

[0031] Figure 1 is a plan view of an insulating bush according to an embodiment of the present application, and Figure 2 is an exploded perspective view of an insulating bush according to an embodiment of the present application.

[0032] Referring to Figure 1 and Figure 2 , an insulating bush (hereinafter referred to as "insulating bush") according to an embodiment of the present application for protecting a busbar 10, and including a first bush 500, a second bush 200, a cover 100, a first gasket 300, a second gasket 400, and a bolt washer 600, in which the busbar 10 passes through the first bush 500, the second bush 200, and the cover 100.

[0033] The first bush 500 has an upper first bush portion 510 received in the second bush 200, and a lower first bush portion 520 protruding downward from the insulating bush. Here, the first bush 500 is provided with a first bush stopper 530 protruding from the first bush 500 in a lateral direction to adjust a receiving depth of the first bush in the second bush 200.

[0034] The first bush 500 is formed of a first bush component including mainly an unsaturated polyester and a glass fiber. For example, the first bush component can include 10 to 40% by weight of an unsaturated polyester, 5 to 15% by weight of styrene, optionally 3% by weight or less of polyethylene, optionally 5% by weight or less of polystyrene, optionally 1% by weight or less of a peroxide, optionally 3% by weight or less of zinc di-stearate, 20 to 60% by weight of aluminum hydroxide, and 5 to 25% by weight of glass fiber wool. With such a component, the first bush exhibits better thermal and structural durability compared to typical insulating bushes in the art, thereby allowing elimination of a reinforcing member extending from a lower surface of the first bush stopper 530 to a lower end of the lower first bush portion 520. That is, the insulating bush according to the present embodiment is characterized in that the first bush 500 is not formed with a reinforcing member extending from a lower surface of the first bush stopper 530 to a lower end of the lower first bush portion 520.

[0035] The second bush 200 includes a second bush body 210 in which a first bush receiving portion 250 adapted to receive the upper first bush portion 510 is formed, and a second bush flange 220 protruding in a lateral direction from a lower portion of the upper first bush portion 510. Here, the second bush 200 constitutes a region protruding in the lateral direction from the central portion of the insulating bush by the second bush flange 220.

[0036] The second bush 200 is formed of a second bush component mainly including unsaturated polyester and glass fiber. For example, the second bush component can include 10 to 40% by weight of unsaturated polyester, 5 to 15% by weight of styrene, optionally 3% or less by weight of polyethylene, optionally 5% or less by weight of polystyrene, optionally 1% or less by weight of peroxide, optionally 3% or less by weight of zinc distearate, 20 to 60% by weight of aluminum hydroxide, and 5 to 25% by weight of glass fiber wool. With such a component, the second bush exhibits better thermal and structural durability compared to typical insulating bushes in the art, thereby allowing the elimination of the cavity or rib on the lower surface of the second bush flange 220. That is, the insulating bush according to the present embodiment is characterized in that the second bush flange 220 has a flat lower surface except for regions in which the second bush bolt holes 230 are respectively formed in the second bush 200.

[0037] The cover 100 is formed on the outside of the second bush 200 so as to surround the second bush 200, and the cover 100 is formed to surround the outer surfaces of the second bush body 210 and the second bush flange 220. Here, the cover 100 has a shape corresponding to the outer surfaces of the second bush 200, and the cover 100 is further provided with an upper cover flange 110 protruding in a lateral direction from an upper portion of the cover.

[0038] The cover 100 is formed of silicone. Accordingly, the cover can stably cover the first bush 500 without being pushed on the surface of the first bush 500, while ensuring good insulating performance, weather resistance, flame resistance, and waterproof and drainage performance.

[0039] The first gasket 300 is arranged between the upper surface of the upper first bush portion 510 and a first gasket seat 271 (see Figure 9 ) formed on the inner surface of the second bush 200.

[0040] The first gasket 300 can be formed of silicone, thereby further improving the waterproof performance of the insulating bush.

[0041] The second gasket 400 is disposed between the first bush stopper 530 and a second step 262 formed on the inner side of the second bush flange 220.

[0042] The second gasket 400 can be formed of silicone, thereby further improving the waterproof performance of the insulating bush.

[0043] Each of the bolt washers 600 is disposed in a bolt washer groove 240 on the second bush flange 220 and serves to prevent the second bush flange peak 221 (see Figure 4 ) from being damaged due to excessive stress concentration on the second bush flange long side 225 (see Figure 4 ), while improving the waterproof performance of the insulating bush.

[0044] The bolt washers 600 can be formed of silicone, thereby further improving the waterproof performance of the insulating bush.

[0045] Figure 3 is a view of a second bush of an insulating bush according to an embodiment of the present application, and Figure 4 is a bottom perspective view of an insulating bush according to an embodiment of the present application.

[0046] Referring to Figure 2 to Figure 4 , the second bush 200 includes a second bush body 210 and a second bush flange 220.

[0047] The second bush body 210 can have a shape extending in a vertical direction and a horizontal cross-sectional area gradually decreasing in an upward direction. For example, the second bush body 210 can have a tapered shape. Accordingly, the insulating bush can achieve improvement in insulating characteristics and drainage characteristics. For example, the second bush body 210 is inclined at an angle of 10° to 30° with respect to the second bush flange 220. Within this range, the insulating bush can achieve improvement in insulating characteristics and drainage characteristics.

[0048] The second bush body 210 is provided therein with a first bush receiving portion 250 receiving the upper first bush portion 510, and the second bush body 210 is provided at an upper end portion thereof with a second bush passage 290 through which the busbar 10 (see Figure 1 ) passes.

[0049] The second bush flange 220 protrudes from a lower portion of the second bush body 210 in a lateral direction to surround the lower portion of the second bush body 210, and the second bush flange 220 is formed with a plurality of second bush bolt holes 230.

[0050] Referring to Figure 4, the second bush flange 220 can include a second bush flange long side 225 and a second bush flange short side 226 according to the shape of the second bush passage 290, in which the second bush flange long side has an M shape with a peak and a valley. With this configuration, the insulating bush can achieve improvement in waterproof performance. For example, a pair of second bush flange long sides 225 and second bush flange short sides 226 are arranged to respectively face another pair of second bush flange long sides 225 and second bush flange short sides 226.

[0051] Each of the second bush flange long sides 225 includes a second bush flange peak 221, a second bush flange valley 222, a second bush flange inner connecting portion 223, and a second bush flange outer connecting portion 224.

[0052] The second bush flange peak 221 can refer to a region curved convexly in a direction away from the center of the second bush 200, for example, a point spaced farthest in the horizontal direction from the center line B3-B3 of the second bush 200.

[0053] The second bush flange valley 222 can refer to a region curved concavely in a direction toward the center of the second bush 200, for example, a point closest to the center line B3-B3 of the second bush 200.

[0054] The second bush flange inner connecting portion 223 can refer to a region connecting the second bush flange peak 221 to the second bush flange valley 222, for example, a region connecting the second bush flange peak 221 having a convexly curved shape to the second bush flange valley 222 having a concavely curved shape in a straight line shape.

[0055] The second bush flange outer connecting portion 224 can refer to a region connecting the second bush flange peak 221 to the second bush flange short side 226, for example, a region connecting the second bush flange peak 221 having a curved shape to the distal end of the second bush flange short side 226 having a straight line shape in a straight line shape.

[0056] That is, each of the second bush flange inner connecting portion 223, the second bush flange outer connecting portion 224, and the second bush flange short side 226 has a straight line shape extending to a predetermined length, thereby improving the durability of the insulating bush.

[0057] The inventors of the present application developed the predetermined shapes of the second bush flange 220 described below by manufacturing, testing, and design changing various shapes of the second bush flange 220 for improving the insulating performance, as well as the durability and waterproof performance of the insulating bush.

[0058] As Figure 4As shown, each of the long sides 225 of the second bushing flange may be provided with a pair of second bushing bolt holes 230, and the valleys 222 of the second bushing flange may be arranged between imaginary lines A1-A1 and A2-A2. The imaginary lines A1-A1 connect the sides of the second bushing bolt holes 230 away from the center line B3-B3 of the second bushing 200, and the imaginary lines A2-A2 connect the other sides of the second bushing bolt holes 230 near the center line B3-B3 of the second bushing 200. When the valleys 222 of the second bushing flange are arranged inside the imaginary lines A2-A2, the insulating bushing may suffer from deterioration in waterproof performance, and when the valleys 222 of the second bushing flange are arranged outside the imaginary lines A1-A1, the insulating bushing may suffer from excessive increase in manufacturing costs. In other words, the insulating bushing according to the invention is made of a material different from that of typical insulating bushings in the art, thereby reducing manufacturing costs while satisfying all performance requirements of insulation, durability and waterproofing.

[0059] As an example, the valley portion 222 of the second bushing flange can be arranged inside the imaginary center line A3-A3 of a pair of second bushing bolt holes 230 connecting the long side portion 225 of the second bushing flange. Using this structure, the insulating bushing can reduce manufacturing costs while improving insulation performance, water resistance, and durability.

[0060] like Figure 4 As shown, each long side of the second bushing flange 225 can be provided with a pair of second bushing bolt holes 230, and the valley portion 222 of the second bushing flange can be arranged inside the intersection of imaginary lines A4-A4 and A5-A5. Imaginary line A4-A4 connects the first side of one second bushing bolt hole 230 away from the center line B3-B3 of the second bushing 200 to the second side of the other second bushing bolt hole 230 near the center of the second bushing 200. Similarly, imaginary line A5-A5 connects the second side of the one second bushing bolt hole 230 near the center line B3-B3 of the second bushing 200 to the first side of the other second bushing bolt hole 230 away from the center line B3-B3 of the second bushing 200. Using this structure, the insulating bushing can reduce manufacturing costs while improving insulation performance, waterproofing performance, and durability.

[0061] like Figure 4As shown, the second bushing passage 290 includes a second bushing passage long side 291 having a straight shape extending to a predetermined length and a second bushing passage short side 292. Here, the second bushing passage short side 292 can be disposed between an imaginary line B1-B1 connecting one side end of a pair of second bushing flange short sides 226 facing each other and an imaginary line B2-B2 connecting the other side end of the second bushing flange short sides. With this structure, the insulating bushing can achieve improvement in all of the insulation performance, the waterproof performance, and the durability.

[0062] As shown, Figure 4 the second bushing flange 220 can have a flat lower surface. That is, as described above, since the second bushing 200 is formed of a component including unsaturated polyester and glass fiber to prevent hot air shrinkage through significant improvement in thermal durability, the second bushing does not need to form a concave region such as a cavity or a rib, thereby reducing manufacturing costs while achieving improvement in the insulation performance, the waterproof performance, and the durability.

[0063] Figure 5 is a view of a cover of an insulating bushing according to an embodiment of the present application, and Figure 6 is a plan view of an insulating bushing according to an embodiment of the present application.

[0064] Referring to Figure 5 and Figure 6 , the cover 100 is coupled to an outer surface of the second bushing 200 and is provided with a cover passage 150 through which the busbar 10 (see Figure 1 ) passes. The cover 100 includes a cover body 130, a lower cover flange 140, and an upper cover flange 110.

[0065] The upper cover flange 110 protrudes from an upper portion of the cover body 130 in a lateral direction and can have a predetermined inclination angle to improve the drainage performance by preventing rainwater or the like from penetrating to a position of the busbar 10 (see Figure 1 ). For example, in a side view of the cover 100, the upper cover flange 110 can be inclined at an angle of 5° to 20° with respect to an upper end of the cover 100.

[0066] The cover body 130 can have a shape corresponding to the second bushing body 210.

[0067] The lower cover flange 140 protrudes from a lower portion of the cover body 130 in a lateral direction to surround the lower portion of the cover body 130, and the lower cover flange 140 can be formed with a plurality of cover bolt holes 120.

[0068] Referring to Figure 6The lower cover flange 140 may include a long side portion 146 and a short side portion 147, depending on the shape of the cover channel 150. Each of the long side portions 146 may have an M-shape, including a lower cover flange peak 142 that curves outward in a direction away from the center of the cover 100 and a lower cover flange valley 143 that curves inward toward the center of the cover 100. With this structure, the insulating bushing can achieve improved waterproof performance. For example, a pair of lower cover flange long side portions 146 and lower cover flange short side portions 147 may be arranged to face another pair of lower cover flange long side portions 146 and lower cover flange short side portions 147, respectively. For example, the lower cover flange 140 may have a shape corresponding to the second bushing flange 220.

[0069] The upper cover flange 110 can protrude laterally from the upper portion of the cover body 130 to surround the upper portion of the cover body 130.

[0070] like Figure 6 As shown, the upper cover flange 110 includes a pair of long sides 111 of the upper cover flange extending in a straight shape and facing each other, and a pair of short sides 112 of the upper cover flange connecting the pair of long sides 111 of the upper cover flange to each other, wherein the long sides 111 of the upper cover flange are arranged inside the valley of the lower cover flange 143, thereby improving the insulation performance of the insulating bushing.

[0071] The short side 112 of the upper cover flange can extend in a curved shape and can be arranged inside the short side 147 of the lower cover flange, thereby improving the insulation performance of the insulating bushing.

[0072] Figure 7 This is a perspective view of the first bushing of the insulating bushing according to an embodiment of the present invention, and Figure 8 This is a bottom perspective view of an insulating bushing according to an embodiment of the present invention.

[0073] Reference Figure 7 The first bushing 500 is equipped with a busbar 10 (see...) Figure 1 It passes through the first bushing channel 550 therein and includes an upper first bushing portion 510, a first bushing stop 530 and a lower first bushing portion 520.

[0074] The upper first bushing portion 510 is the portion of the first bushing 500 that is received in the first bushing receiving portion 250 and has a first bushing side hole 560 formed therein. In the busbar 10 (see...) Figure 1 When the busbar is arranged to pass through the insulating bushing according to the invention, the retaining pin is inserted into the first bushing side hole 560, so that the busbar can be securely fixed to the insulating bushing.

[0075] The first bush stopper 530 protrudes from a lower portion of the upper first bush portion 510 in a lateral direction to surround the lower portion of the upper first bush portion 510.

[0076] The lower first bush portion 520 can extend downward from the first bush stopper 530.

[0077] Referring to Figure 8 , the lower first bush portion 520 is provided at an upper portion thereof with a protrusion 540 protruding from the lower first bush portion 520 in a lateral direction.

[0078] The protrusion 540 allows the insulating bush to be stably installed at an installation position when the insulating bush is assembled to a fastening target such as a switchboard, a transformer, a circuit breaker, an energy storage device, etc., and to be maintained in a stable assembled state without swinging or even vibrating in the fastening target after the insulating bush is assembled to the fastening target.

[0079] The protrusion 540 can be placed above the center of the lower first bush portion 520, for example, at a position corresponding to one third of the height of the lower first bush portion 520, particularly, at a position within one fourth of the height of the lower first bush portion 520. In addition, the protrusion 540 can be placed inside the outermost end of the first bush stopper 530. Accordingly, the insulating bush can be stably placed at the installation position of the fastening target, and can be maintained in a stable assembled state without swinging or even vibrating in the fastening target after the insulating bush is assembled.

[0080] Figure 9 is a cross-sectional view taken along line C1-C1 in Figure 4 .

[0081] Referring to Figure 2 and Figure 9 , the second bush 200 can be formed with a first gasket seat 271, a first step 261, a second bush seat 272, a second gasket seat 280, and a second step 262 in the second bush 200.

[0082] The first gasket seat 271 extends inside the second bush body 210 in a horizontal direction to allow the first gasket 300 to be seated on the first gasket seat 271. The first gasket 300 is adapted to allow the upper surface of the upper first bush portion 510 to be firmly coupled and fixed inside the first bush receiving portion 250 in the second bush 200. For example, the first gasket 300 can be formed of silicone, thereby improving the waterproof performance of the insulating bush.

[0083] The first step 261 is bent downward from the first gasket seat 271 and extends from the first gasket seat 271. The upper first bushing portion 510 is slid on the first step 261 to be received in the first step 261.

[0084] The second bushing seat 272 is bent outward from the first step 261 and extends from the first step 261. The first bushing stopper 530 can be seated on the second bushing seat 272 to prevent foreign substances or moisture from entering the first bushing receiving portion 250.

[0085] The second gasket seat 280 extends in a horizontal direction from the second bushing seat 272 to allow the second gasket 400 to be seated on the second gasket seat 280. Here, the second gasket 400 is adapted to allow the first bushing stopper 530 to be securely coupled and fixed to a lower surface of the second bushing flange 220. For example, the second gasket 400 can be formed of silicone, thereby improving waterproofing performance of the insulating bushing.

[0086] For example, the second bushing seat 272 and the second gasket seat 280 can be a continuous area, and can be individually mentioned according to a seating position of the second bushing 200 and the second gasket 400. In another embodiment, the second gasket seat 280 can be more concavely formed with respect to the second bushing seat 272.

[0087] The second step 262 is bent downward from the second gasket seat 280 and extends from the second gasket seat 280. The first gasket 300 can be disposed in a compressed state between the second step 262 and the upper first bushing portion 510, thereby preventing foreign substances or moisture from entering the first bushing receiving portion 250.

[0088] Although some embodiments have been described herein with reference to the accompanying drawings, it will be understood that these embodiments are given by way of illustration only, and that the present application is not limited thereto. The scope of the present application should be limited only by the appended claims and equivalents thereof.

[0089] For example, the drawings schematically show each component to help those skilled in the art to understand, and the thickness, length, number, etc. of each component shown in the drawings can be different from the actual thickness, length, number, etc. of each component in the process of making the drawings. In addition, it should be understood that the material, shape, and size of each component in the embodiments are provided by way of illustration only, and those skilled in the art can make various modifications, changes, and alterations without departing from the spirit and scope of the present application.

[0090] List of Reference Numerals

[0091] 10: busbar 100: cover

[0092] 110: upper cover flange 111: upper cover flange long side portion

[0093] 112 upper cover flange short side portion 120 cover bolt hole

[0094] 130 cover body 131 second bushing receiving portion

[0095] 140 lower cover flange

[0096] 141 second bushing flange receiving portion

[0097] 142 lower cover flange peak 143 lower cover flange valley

[0098] 144 lower cover flange inner connecting portion

[0099] 145 lower cover flange outer connecting portion

[0100] 146 lower cover flange long side portion

[0101] 147 lower cover flange short side portion

[0102] 150 cover passage 200 second bushing

[0103] 210 second bushing body 220 second bushing flange

[0104] 221 second bushing flange peak 222 second bushing flange valley

[0105] 223 second bushing flange inner connecting portion

[0106] 224 second bushing flange outer connecting portion

[0107] 225 second bushing flange long side portion

[0108] 226 second bushing flange short side portion

[0109] 230 second bushing bolt hole 240 bolt washer groove

[0110] 250 first bushing receiving portion 261 first step

[0111] 262 second step 271 first gasket seat

[0112] 272 second bushing seat 280 second gasket seat

[0113] 290 second bushing passage

[0114] 291 second bushing passage long side portion

[0115] 292 second bushing passage short side portion

[0116] 300: first gasket 400: second gasket

[0117] 500: first bushing 510: upper first bushing portion

[0118] 520: lower first bushing portion 530: first bushing stop

[0119] 540: nub 550: first bushing passage

[0120] 560: first bushing side hole 600: bolt washer

Claims

1. An insulating bush adapted to protect a busbar and having improved insulating and waterproofing properties, the insulating bush comprising: a first bush provided with a first bush passage through which the busbar passes; a second bush provided with a first bush receiving portion that receives an upper portion of the first bush inserted through a lower portion of the first bush receiving portion, and a second bush passage through which the busbar passes; and a cover coupled to an outer surface of the second bush and provided with a cover passage through which the busbar passes, wherein the second bush includes a second bush body, and a second bush flange protruding from a lower portion of the second bush body in a lateral direction of the second bush body to enclose the lower portion of the second bush body, and the second bush flange is formed with a plurality of second bush bolt holes, the second bush flange includes a second bush flange long side and a second bush flange short side according to a shape of the second bush passage, the second bush flange long side has an M shape with a peak and a valley, wherein the cover includes: a cover body; a lower cover flange protruding from a lower portion of the cover body in a lateral direction to enclose the lower portion of the cover body, and the lower cover flange is formed with a plurality of cover bolt holes; and an upper cover flange protruding from an upper portion of the cover body in a lateral direction to enclose the upper portion of the cover body, and wherein the lower cover flange includes a lower cover flange long side and a lower cover flange short side according to a shape of the cover passage, the lower cover flange long side has an M shape including a lower cover flange peak curved convexly in a direction away from a center of the cover and a lower cover flange valley curved concavely in a direction toward the center of the cover. each of the second bush flange long sides includes:

2. The insulating bushing of claim 1, wherein, a second bush flange peak curved convexly in a direction away from a center of the second bush; and a second bush flange valley curved concavely in a direction toward the center of the second bush. 3.The insulating bush of claim 2, wherein: each of the second bush flange long sides is provided with a pair of second bush bolt holes; and the second bush flange valley is provided between an imaginary line A1-A1 and an imaginary line A2-A2, wherein the imaginary line A1-A1 is a line connecting sides of the second bush bolt holes away from the center of the second bush to each other, and the imaginary line A2-A2 is a line connecting other sides of the second bush bolt holes close to the center of the second bush to each other. 4.The insulating bush of claim 2, wherein: ​ Each of the second bush flange long side portions is provided with a pair of second bush bolt holes; and The second bush flange valley portion is provided inside an intersection between an imaginary line A4-A4 and an imaginary line A5-A5, wherein the imaginary line A4-A4 is a line connecting a first side of one second bush bolt hole, which is away from a center of the second bush, to a second side of another second bush bolt hole, which is close to the center of the second bush, and the imaginary line A5-A5 is a line connecting the second side of the one second bush bolt hole, which is close to the center of the second bush, to the first side of the another second bush bolt hole, which is away from the center of the second bush.

5. The insulating bushing of claim 2, wherein, Each of the second bush flange long side portions further includes: a second bush flange inner connecting portion connecting the second bush flange peak portion to the second bush flange valley portion; and a second bush flange outer connecting portion connecting the second bush flange peak portion to the second bush flange short side portion.

6. The insulating bushing of claim 5, wherein, The second bush flange inner connecting portion and the second bush flange outer connecting portion each have a straight line shape extending to a predetermined length.

7. The insulating bushing of claim 6, wherein, Each of the second bush flange short side portions has a straight line shape extending to a predetermined length.

8. The insulating bushing of claim 7, wherein, The second bush passage includes a second bush passage long side portion and a second bush passage short side portion each having a straight line shape extending to a predetermined length, and The second bush passage short side portion is provided between an imaginary line B1-B1 connecting one side end portions of a pair of second bush flange short side portions facing each other and an imaginary line B2-B2 connecting other side end portions of the pair of second bush flange short side portions.

9. The insulating bushing of claim 1, wherein, The second bush body has a shape in which a horizontal cross-sectional area gradually decreases in an upward direction.

10. The insulating bushing of claim 1, wherein, The second bush flange has a flat lower surface.

11. The insulating bushing of claim 1, wherein, The upper cover flange includes a pair of upper cover flange long side portions extending in a straight line shape and facing each other and a pair of upper cover flange short side portions each connecting the pair of upper cover flange long side portions to each other, The upper cover flange long side portions are provided inside the lower cover flange valley portions.

12. The insulating bushing of claim 1, wherein, Each of the upper cover flange short side portions extends in a curved line shape and is provided inside the lower cover flange short side portions.

13. The insulating bushing of claim 1, wherein, The first bush includes: an upper first bush portion received in the first bush receiving portion; a first bush stopper protruding in a lateral direction from a lower portion of the upper first bush portion to surround the lower portion of the upper first bush portion; and a lower first bush portion extending downward from the first bush stopper, wherein the lower first bush portion is provided at an upper portion of the lower first bush portion with a protrusion protruding in a lateral direction from the lower first bush portion, the protrusion is placed above a center of the lower first bush portion.

14. The insulating bushing of claim 13, wherein, The protrusion is formed inside an outermost end portion of the first bush stopper.

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