Electrical equipment sealing connection assembly in severe environment

Abstract

The utility model provides a sealing connection assembly for electrical equipment in a severe environment, which is used for solving the problem that a 316L stainless steel material is added at the connection position of the existing electrical equipment for sealing protection, or an anticorrosive coating material is added; or the scheme of directly replacing the connecting assembly with a salt mist and mould resistant material increases the later maintenance work and the manufacturing cost. According to the electrical equipment sealing connection assembly in the severe environment, the structural form of the sealing joint and the interface sleeve is adopted, sealing connection can be achieved, the influence of the severe environment on electrical equipment is effectively eliminated, meanwhile, the structure is simple, horizontal installation and vertical installation can be achieved, and the electrical equipment sealing connection assembly is convenient to use. Most of on-site requirements are met, the universality is high, and the device can be widely applied to electrical equipment in a severe environment.

Description

Technical Field

[0001] This utility model relates to electrical equipment connection components, and more particularly to a sealed connection component for electrical equipment in harsh environments. Background Technology

[0002] Currently, 110kV and below electrical equipment operating in harsh environments such as the ocean are subject to the effects of external environmental factors such as salt spray, mold, and humidity. Therefore, when electrical equipment is used in such environments, very high requirements are placed on the reliability of the electrical equipment. In order to meet the regulatory requirements, existing solutions include adding 316L stainless steel material for sealing protection at the connection points of electrical equipment, or adding anti-corrosion coating materials, or directly replacing the connection components with materials resistant to salt spray and mold. Although these solutions can effectively eliminate the impact of harsh environments, according to surveys and feedback from power operating units, they still have the following disadvantages: (1) The added components need to be inspected regularly, which increases the work of later maintenance; (2) Since the connection methods of electrical equipment are different in different projects, different protection schemes need to be designed to meet the usage conditions of the projects, which increases the manufacturing cost. Utility Model Content

[0003] The purpose of this utility model is to solve the technical problem that existing solutions, such as adding 316L stainless steel material for sealing and protection at the connection points of electrical equipment, adding anti-corrosion coating material, or directly replacing the connection components with salt spray and mold resistant materials, increase the technical work and manufacturing costs in the later stage. The present invention provides a sealing connection component for electrical equipment in harsh environments.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows:

[0005] A sealing connection assembly for electrical equipment in harsh environments, characterized in that it includes a sealing joint and an interface sleeve;

[0006] The sealing joint includes a first sealing body, a second sealing body, and a terminal block; both the first sealing body and the second sealing body are made of insulating material.

[0007] The first sealing body includes a horizontal sealing body and a vertical sealing body vertically connected to the middle of the horizontal sealing body; a through cavity is provided in the horizontal sealing body corresponding to the position of the vertical sealing body; a first receiving cavity is provided in the horizontal sealing body along the horizontal direction, connecting the through cavity to the outside; a second receiving cavity is provided in the vertical sealing body along the vertical direction, connecting the through cavity to the outside.

[0008] The interface sleeve includes a large-diameter end and a small-diameter end connected to the large-diameter end. The outer side of the large-diameter end is used to fix it to the electrical equipment. The small-diameter end is located in the first receiving cavity, and its outer wall is interference-fitted with the inner wall of the first receiving cavity. The large-diameter end is snapped into the outer end of the first receiving cavity. The inner end face of the small-diameter end is electrically connected to the part of the terminal extending into the conductive cavity. The outer end face of the large-diameter end is used to electrically connect with the conductor of the electrical equipment that transmits current.

[0009] The terminal block is disposed in the second receiving cavity, with one end extending into the conductive cavity and connected to the top of the conductive cavity, and the other end used to connect to the external wire or external cable of the electrical equipment.

[0010] The second sealing body is a hollow tubular structure, which is coaxially arranged in the second receiving cavity. The inner sidewall is used for interference fit with the external wires or external cables of the electrical equipment, and the outer sidewall is used for interference fit with the inner sidewall of the second receiving cavity.

[0011] Furthermore, the interface sleeve includes a copper conductor and an insulating jacket covering the outside of the copper conductor;

[0012] The inner end face of the copper conductor is electrically connected to the portion of the terminal extending into the conductive cavity, and the outer end face is used for electrical connection with the conductor that transmits current in the electrical equipment.

[0013] The outer wall of the insulating jacket corresponding to the small diameter end is press-fitted with the inner wall of the first receiving cavity, and the position corresponding to the inner side of the large diameter end is snapped into the outer end of the first receiving cavity.

[0014] Furthermore, it also includes connecting bolts and fastening nuts;

[0015] The horizontal sealing body has a third receiving cavity that connects the conducting cavity to the outside in the horizontal direction. The third receiving cavity and the first receiving cavity are located on both sides of the conducting cavity, respectively.

[0016] The sealing joint also includes a third sealing body, which is located in the third receiving cavity, and its outer side wall is interference-fitted with the inner side wall of the third receiving cavity.

[0017] The copper conductor has a first threaded hole axially opened on its inner side, and a through hole is opened on the terminal corresponding to the position of the first threaded hole. A metal shell is axially arranged on the inner side of the third sealing body corresponding to the position of the through hole. The metal shell has a clearance hole and a second threaded hole communicating with the clearance hole. One end of the connecting bolt is threaded to the first threaded hole, and its screw passes through the through hole on the terminal and is fastened by installing a fastening nut through the clearance hole. The screw extending out of the fastening nut is threaded to the second threaded hole.

[0018] The third sealing body has a positioning hole on its outer side for rotating and tightening the third sealing body.

[0019] Furthermore, it also includes a fourth sealing body made of insulating material;

[0020] The fourth sealing body is a cap structure, and its sealing is set on the outside of the horizontal sealing body at the position corresponding to the third receiving cavity.

[0021] Furthermore, the diameter of the third sealing body gradually decreases from the outside to the inside.

[0022] Furthermore, the inner end face of the copper conductor is configured as a finger structure.

[0023] Furthermore, the first sealing body, the second sealing body, and the fourth sealing body are each made of silicone rubber; the third sealing body and the insulating jacket are each made of silicone rubber or epoxy resin.

[0024] Furthermore, the diameter of the insulating jacket corresponding to the smaller diameter end gradually decreases from the outside to the inside.

[0025] Furthermore, it also includes multiple crimping rings;

[0026] The other end of the terminal block is provided with a blind hole for the conductive core of the external wire or cable of the electrical equipment to extend into the blind hole; multiple crimping rings are sleeved on the outer wall of the terminal block for pressing the terminal block so that its inner wall is in reliable contact with the conductive core of the external wire or cable of the electrical equipment.

[0027] Furthermore, the sealing joint also includes a pressure equalization shield.

[0028] The equalizing shield is disposed outside the conductive cavity and extends downward between the second sealing body and the first sealing body, with through holes respectively provided at the positions corresponding to the first and third receiving cavities.

[0029] The advantages of this utility model compared to the prior art are as follows:

[0030] 1. The present invention provides a sealing connection component for electrical equipment in harsh environments. It adopts a structure of sealing joint and interface sleeve, which can not only achieve a sealed connection and effectively eliminate the impact of harsh environment on electrical equipment, but also has a simple structure that can be installed horizontally or vertically to meet most field requirements. It is highly versatile and can be widely used for electrical equipment in harsh environments.

[0031] 2. The present invention provides a sealing connection component for electrical equipment in harsh environments. The interface sleeve is made of insulating material. This type of material has no special requirements and can effectively reduce costs.

[0032] 3. In this utility model, the first sealing body, the second sealing body, and the fourth sealing body of the sealing joint are all made of silicone rubber. After the sealing joint is sealed and connected with the interface sleeve, the entire sealing joint covers the connection part. Since silicone rubber is a good material resistant to salt spray, mold, and moisture, it greatly reduces the number of maintenance and replacement times for the power operating unit and effectively reduces the later operating costs.

[0033] 4. This utility model also includes a fourth sealing body with a U-shaped structure, which can further improve the sealing performance between the third sealing body and the first sealing body. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the structure of a first embodiment of the sealing connection assembly for electrical equipment in harsh environments according to this utility model;

[0035] Figure 2 This is a schematic diagram of the sealing joint in Embodiment 1 of this utility model;

[0036] Figure 3 This is a schematic diagram of the interface sleeve in Embodiment 1 of this utility model;

[0037] Figure 4 This is a schematic diagram of the wiring terminal in Embodiment 1 of this utility model.

[0038] The specific labeling in the attached diagram is as follows:

[0039] 1-First sealing body; 11-Conducting cavity; 12-First receiving cavity; 13-Third receiving cavity; 14-Second receiving cavity; 2-Second sealing body; 3-Third sealing body; 4-Terminal; 5-Crimping ring; 6-Interface sleeve; 61-Copper conductor; 62-Insulating jacket; 7-Connecting bolt; 8-Fastening nut; 9-Fourth sealing body; 10-Equalizing shield. Detailed Implementation

[0040] To make the advantages and features of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] Example 1

[0042] like Figure 1 As shown, an electrical equipment sealing connection assembly for harsh environments includes a sealing joint, an interface sleeve 6, a connecting bolt 7, and a fastening nut 8.

[0043] like Figure 2As shown, the sealing joint includes a first sealing body 1, a second sealing body 2, a third sealing body 3, a terminal block 4, multiple crimping rings 5, and a pressure equalizing shield 10. The first sealing body 1 includes a horizontal sealing body and a vertical sealing body vertically connected to the middle of the horizontal sealing body; a conductive cavity 11 is provided in the horizontal sealing body corresponding to the position of the vertical sealing body; a first receiving cavity 12 and a third receiving cavity 13 are provided in the horizontal direction of the horizontal sealing body, which communicate with the conductive cavity 11 and the outside, and the first receiving cavity 12 and the third receiving cavity 13 are respectively located on both sides of the conductive cavity 11; a second receiving cavity 14 is provided in the vertical direction of the vertical sealing body, which communicates with the conductive cavity 11 and the outside.

[0044] like Figure 3 As shown, the interface sleeve 6 includes a large-diameter end and a small-diameter end connected to the large-diameter end. The outer side of the large-diameter end is used for fixing to the electrical equipment, and the small-diameter end is located inside the first receiving cavity 12, realizing the electrical connection between the conductor of the electrical equipment transmitting current and the terminal 4. Specifically, the interface sleeve 6 includes a copper conductor 61 and an insulating outer sleeve 62 covering the outside of the copper conductor 61. The inner end face of the copper conductor 61 is electrically connected to the portion of the terminal 4 extending into the conductive cavity 11, and the outer end face is used for electrical connection with the conductor of the electrical equipment transmitting current. The outer wall of the insulating outer sleeve 62 corresponding to the small-diameter end is interference-fitted with the inner wall of the first receiving cavity 12, and the position corresponding to the inner side of the large-diameter end is snapped onto the outer end of the first receiving cavity 12, thereby realizing the functions of preventing salt spray, mold, moisture, etc. The third sealing body 3 is located inside the third receiving cavity 13, and its outer wall is interference-fitted with the inner wall of the third receiving cavity 13. This utility model, through the connection method of the interface sleeve 6 to the electrical equipment, can meet most field requirements, and can be installed horizontally or vertically, with strong applicability.

[0045] A first threaded hole is axially formed on the inner side of the copper conductor 61. A through hole is formed on the terminal 4 corresponding to the position of the first threaded hole. A metal shell is axially formed on the inner side of the third sealing body 3 corresponding to the position of the through hole. The metal shell has a clearance hole and a second threaded hole communicating with the clearance hole. The metal shell solves the problem that the connecting bolt 7 cannot be directly connected to the insulating material. One end of the connecting bolt 7 is threaded to the first threaded hole. Its screw passes through the through hole on the terminal 4 and is tightened by installing the fastening nut 8 through the clearance hole. The screw extending out of the fastening nut 8 is threaded to the second threaded hole. This connection method can ensure a reliable electrical connection between the copper conductor 61 and the terminal 4. The threaded connection between the connecting bolt 7 and the second threaded hole is achieved by rotating the third sealing body 3. Therefore, a positioning hole is formed on the outer side of the third sealing body 3 for rotating and tightening the third sealing body 3 through the positioning hole.

[0046] Terminal 4 is disposed within the second receiving cavity 14, such as Figure 4As shown, one end of the terminal 4 extends into the conductive cavity 11 and connects to the top of the conductive cavity 11. The other end has a blind hole for the conductive core of the external wire or cable of the electrical equipment to extend into the blind hole. Multiple crimping rings 5 ​​are sleeved on the outer wall of the terminal 4 to press the terminal 4 so that its inner wall can reliably contact the conductive core of the external wire or cable of the electrical equipment. The second sealing body 2 is a hollow tubular structure, which is coaxially arranged in the second receiving cavity 14. Its inner wall is used for interference fit with the external wire or cable of the electrical equipment, and its outer wall is used for interference fit with the inner wall of the second receiving cavity 14 to achieve a sealed connection between the external wire or cable of the electrical equipment and the first sealing body 1.

[0047] The equalizing shield 10 is disposed outside the conductive cavity and extends downward to the space between the second sealing body and the first sealing body. It has through holes at the positions corresponding to the first receiving cavity 12 and the third receiving cavity 13. The equalizing shield 10 is used to suppress the protruding electric field generated by the multiple crimping rings 5 ​​sleeved on the outer wall of the terminal 4, thereby ensuring that there will be no phenomenon of seal breakdown.

[0048] Preferably, this embodiment also includes a fourth sealing body 9, which is a cap structure. Its sealing is set on the outside of the horizontal sealing body at the position corresponding to the third receiving cavity 13, in order to further improve the sealing performance between the third sealing body 3 and the first sealing body 1.

[0049] The insulating outer sleeve 62 of the interface sleeve 6 is made of insulating materials such as epoxy resin and silicone rubber. In this embodiment, epoxy resin is preferred, and its thickness is approximately 5-20mm. This type of material has no special requirements and can effectively reduce costs. The first sealing body 1, the second sealing body 2, the third sealing body 3, and the fourth sealing body 9 in the sealing joint are all made of insulating materials. Among them, since the first sealing body 1 and the fourth sealing body 9 are completely exposed on the outside, and the second sealing body 2 is partially exposed on the outside, silicone rubber is preferred. The third sealing body 3 is located inside and can be made of insulating materials such as silicone rubber or epoxy resin. In this embodiment, the first sealing body 1, the second sealing body 2, the third sealing body 3, and the fourth sealing body 9 are all made of silicone rubber. After the sealing joint is sealed and connected to the interface sleeve 6, the entire sealing joint covers the connection part. Since silicone rubber is a good material resistant to salt spray, mold, and moisture, it eliminates the maintenance costs for the power supply unit, and its cost is also low.

[0050] Since the electrical equipment used in the project currently uses voltage levels of 110kV, 66kV, and 35kV, the size of the interface bushing 6 cannot be too large, the voltage level must be uniform, and the rated current must be at least 1250A. The copper conductor 61 at the center of the interface bushing 6 of this utility model is a cylinder with a diameter of less than 50mm.

[0051] Preferably, in this embodiment, the diameter of the portion of the insulating jacket 62 corresponding to the small diameter end and the third sealing body 3 gradually decreases from the outside to the inside. That is, the portion of the insulating jacket 62 corresponding to the small diameter end and the outer wall of the third sealing body 3 are tapered to facilitate the insertion and removal of the interface sleeve 6 and the third sealing body 3.

[0052] The usage process of the sealed connection assembly in this embodiment is as follows:

[0053] 1. First, manually strip the protective layer of the external wires or cables of the electrical equipment to expose the conductive cores, and then let the external wires or cables of the electrical equipment pass through the second sealing body 2; then install the terminal block 4, so that the conductive cores of the external wires or cables of the electrical equipment extend into the blind hole of the terminal block 4, and then press the terminal block 4 with multiple crimping rings 5 ​​to make its inner wall reliably contact the conductive cores of the external wires or cables of the electrical equipment.

[0054] 2. Insert the integrated structure formed by the external wires or cables of the electrical equipment, the second sealing body 2, and the terminal 4 into the second receiving cavity 14 of the first sealing body 1 to achieve a sealed connection between the first sealing body 1 and the second sealing body 2, and extend the terminal 4 into the conducting cavity 11.

[0055] 3. Connect one end of the connecting bolt 7 to the first threaded hole inside the copper conductor 61 in the interface sleeve 6. Then, insert the small-diameter end of the interface sleeve 6 into the first receiving cavity 12 to achieve a sealed connection between the first sealing body 1 and the interface sleeve 6. The screw of the connecting bolt 7 passes through the through hole on the terminal 4. Install the fastening nut 8 on the screw of the connecting bolt 7 through the third receiving cavity 13 to further achieve a fixed connection between the first sealing body 1 and the interface sleeve 6, thereby ensuring a reliable electrical connection.

[0056] The third sealing body 3 is installed in the third receiving cavity 13, and the screw of the connecting bolt 7 is threadedly connected to the second threaded hole on the inner side of the third sealing body 3 to firmly fix the third sealing body 3 on the first sealing body 1, thereby achieving a sealed connection between the third sealing body 3 and the first sealing body 1. The installation is then complete.

[0057] Example 2

[0058] The difference between this embodiment and the previous one is that the inner end face of the copper conductor 61 in the interface sleeve 6 is set as a finger structure, and its connection with the conductive cavity 11 is a plug-in structure. Since the plug-in structure does not require connecting bolts 7 and fastening nuts 8 to achieve a fixed connection between the first sealing body 1 and the interface sleeve 6, in this embodiment, only the conductive cavity 11 and the first receiving cavity 12 are provided in the horizontal sealing body, and the third receiving cavity 13 is not provided. Correspondingly, the third sealing body 3 and the fourth sealing body 9 are not provided.

[0059] The above description is only used to illustrate the technical solution of this utility model, and is not intended to limit it. For those skilled in the art, modifications can be made to the specific technical solutions described in the above embodiments, or equivalent substitutions can be made to some of the technical features. However, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions protected by this utility model.

Claims

1. A sealing connection assembly for electrical equipment in harsh environments, characterized in that: Including sealing joints and interface sleeves (6); The sealing joint includes a first sealing body (1), a second sealing body (2), and a terminal block (4); both the first sealing body (1) and the second sealing body (2) are made of insulating material; The first sealing body (1) includes a horizontal sealing body and a vertical sealing body connected vertically in the middle of the horizontal sealing body; a connecting cavity (11) is provided in the horizontal sealing body corresponding to the position of the vertical sealing body; a first receiving cavity (12) is provided in the horizontal sealing body along the horizontal direction to connect the connecting cavity (11) to the outside; a second receiving cavity (14) is provided in the vertical sealing body along the vertical direction to connect the connecting cavity (11) to the outside. The interface sleeve (6) includes a large-diameter end and a small-diameter end connected to the large-diameter end. The outer side of the large-diameter end is used to fix it to the electrical equipment. The small-diameter end is located in the first receiving cavity (12), and its outer wall is interference-fitted with the inner wall of the first receiving cavity (12). The large-diameter end is snapped into the outer end of the first receiving cavity (12). The inner end face of the small-diameter end is electrically connected to the part of the terminal (4) extending into the conductive cavity (11). The outer end face of the large-diameter end is used to electrically connect with the conductor of the electrical equipment that transmits current. The terminal block (4) is disposed in the second receiving cavity (14), one end of which extends into the conducting cavity (11) and is connected to the top of the conducting cavity (11), and the other end is used to connect to the external wire or external cable of the electrical equipment. The second sealing body (2) is a hollow tubular structure, which is coaxially arranged in the second receiving cavity (14). The inner sidewall is used for interference fit with the external wires or external cables of the electrical equipment, and the outer sidewall is interference fit with the inner sidewall of the second receiving cavity (14).

2. The sealing connection assembly for electrical equipment in harsh environments according to claim 1, characterized in that: The interface sleeve (6) includes a copper conductor (61) and an insulating jacket (62) covering the outside of the copper conductor (61). The inner end face of the copper conductor (61) is electrically connected to the portion of the terminal (4) extending into the conductive cavity (11), and the outer end face is used for electrical connection with the conductor that transmits current in the electrical equipment. The outer wall of the insulating jacket (62) corresponding to the small diameter end is press-fitted with the inner wall of the first receiving cavity (12), and the position corresponding to the inner side of the large diameter end is snapped into the outer end of the first receiving cavity (12).

3. The sealing connection assembly for electrical equipment in harsh environments according to claim 2, characterized in that: It also includes connecting bolts (7) and fastening nuts (8); The horizontal sealed body is provided with a third receiving cavity (13) that connects the conducting cavity (11) to the outside in the horizontal direction. The third receiving cavity (13) and the first receiving cavity (12) are located on both sides of the conducting cavity (11). The sealing joint also includes a third sealing body (3), which is located in the third receiving cavity (13), and its outer side wall is interference-fitted with the inner side wall of the third receiving cavity (13); The copper conductor (61) has a first threaded hole axially opened on its inner side, and a through hole is opened on the terminal (4) corresponding to the position of the first threaded hole. A metal shell is axially arranged on the inner side of the third sealing body (3) corresponding to the position of the through hole. A clearance hole and a second threaded hole communicating with the clearance hole are provided in the metal shell. One end of the connecting bolt (7) is threadedly connected to the first threaded hole. Its screw passes through the through hole on the terminal (4) and is fastened by installing a fastening nut (8) through the clearance hole. The screw extending out of the fastening nut (8) is threadedly connected to the second threaded hole. The third sealing body (3) has a positioning hole on its outer side for rotating and fastening the third sealing body (3).

4. The sealing connection assembly for electrical equipment in harsh environments according to claim 3, characterized in that: It also includes a fourth sealing body (9) made of insulating material; The fourth sealing body (9) is a cap structure, and its sealing is set at the position corresponding to the third receiving cavity (13) on the outside of the horizontal sealing body.

5. The sealing connection assembly for electrical equipment in harsh environments according to claim 4, characterized in that: The diameter of the third sealing body (3) gradually decreases from the outside to the inside.

6. The sealing connection assembly for electrical equipment in harsh environments according to claim 2, characterized in that: The inner end face of the copper conductor (61) is configured as a finger structure.

7. A sealing connection assembly for electrical equipment in harsh environments according to claim 4 or 5, characterized in that: The first sealing body (1), the second sealing body (2), and the fourth sealing body (9) are made of silicone rubber. The third sealing body (3) and the insulating jacket (62) are respectively made of silicone rubber or epoxy resin.

8. The sealing connection assembly for electrical equipment in harsh environments according to claim 7, characterized in that: The diameter of the insulating jacket (62) at the smaller diameter end gradually decreases from the outside to the inside.

9. The sealing connection assembly for electrical equipment in harsh environments according to claim 8, characterized in that: It also includes multiple crimping rings (5); The other end of the terminal (4) is provided with a blind hole for the conductive core of the external wire or cable of the electrical equipment to extend into the blind hole; a plurality of crimping rings (5) are sleeved on the outer side wall of the terminal (4) for pressing the terminal (4) so ​​that its inner side wall is in reliable contact with the conductive core of the external wire or cable of the electrical equipment.

10. The sealing connection assembly for electrical equipment in harsh environments according to claim 9, characterized in that: The sealing joint also includes a pressure equalization shield (10). The equalizing shield (10) is located outside the conductive cavity (11) and extends downward to the space between the second sealing body (2) and the first sealing body (1). It has through holes at the positions corresponding to the first receiving cavity (12) and the third receiving cavity (13).

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