Segmented combined explosion-proof box for cable intermediate joint

Abstract

The utility model provides a segmented combined explosion-proof box for a cable intermediate joint, and belongs to the technical field of cable accessories. Comprising a left-end shell, a right-end shell and a middle shell, the middle shell is arranged between the left-end shell and the right-end shell, the left-end shell, the right-end shell and the middle shell are connected and combined through bolts to form the explosion-proof box, and sealing rings are arranged between the left-end shell and the middle shell and between the right-end shell and the middle shell respectively. The left end shell and the right end shell are both connected with the middle shell in a sealed mode through sealing rings, one end face of the left end shell and one end face of the right end shell are both fixedly connected with an end cover plate, and a plurality of pressure relief openings are formed in the surface of the end cover plate. According to the utility model, the explosion-proof box adopts a split type design and is convenient to transport separately, the left end shell, the right end shell and the middle shells are small in size, light in weight and convenient to carry and install, and the length of the explosion-proof box can be changed along with the increase and decrease of the number of the middle shells, so that the explosion-proof box can adapt to most cable joints in the market, and the practicability is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of cable accessories, in particular to a segmented combined explosion-proof box used for a cable intermediate joint. Background Art

[0002] With the development of urban construction, cable transmission lines are more and more widely used. Cable intermediate joints are cable accessories used for intermediate connections of cross-linked cables or oil-immersed cables of various voltage levels. Their main function is to make the line unobstructed, keep the cable sealed, and ensure the insulation level at the cable joints, so that they can operate safely and reliably. As the key point and weak point in the cable transmission line, the assembly structure and connectivity of the cable intermediate joints determine the working and operating capacity of the entire cable line. Cable intermediate joints are prone to aging, short circuits, and even explosions and fires during long-term operation, causing heavy losses. Some intermediate joints are installed in cable trenches and cable tunnels. It is necessary to install intermediate joints with explosion-proof and fire-proof protective shells on the intermediate joints to ensure operation and avoid various external factors that cause the intermediate joints to break down or explode during operation, which will cause damage to the entire line and the surrounding environment, and even secondary accidents.

[0003] With the continuous improvement of operating requirements, people have also put forward higher requirements on the working performance of cable joints. In order to effectively prevent accidents such as breakdown and explosion of cable intermediate joints and minimize the harm caused by such accidents, explosion-proof boxes are usually installed outside the cable intermediate joints to protect the cable intermediate joints.

[0004] There are many types of waterproof and explosion-proof joint boxes on the market, most of which are connected by threads on the upper and lower shells, with large connection gaps, insufficient sealing, and poor waterproofness. The previous generation of integrated waterproof and explosion-proof shell structure is long and heavy, and the product is affected by the on-site space when pre-installing the cable joint before installation, which makes installation difficult in some cases. And the length is fixed, and when encountering special long joints, the product cannot be adapted and needs to be customized. Therefore, this application provides a segmented combined explosion-proof box for cable intermediate joints to meet the needs. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a segmented combined explosion-proof box for cable intermediate joints to solve the problem that the existing explosion-proof boxes have a fixed length and cannot be adapted to products when encountering special long joints and need to be customized.

[0006] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0007] A segmented combined explosion-proof box for an intermediate joint of a cable comprises a left end shell, a right end shell and an intermediate shell, wherein an intermediate shell is arranged between the left end shell and the right end shell, and the left end shell, the right end shell and the intermediate shell are connected and assembled into an explosion-proof box by bolts, and the length of the explosion-proof box can be changed as the number of intermediate shells increases or decreases; an intermediate joint is arranged in the middle of the explosion-proof box composed of the left end shell, the right end shell and the intermediate shell; sealing rings are respectively arranged between the left end shell and the right end shell and the intermediate shell, and the left end shell and the right end shell are both sealedly connected to the intermediate shell through the sealing rings; one end face of the left end shell and the right end shell is fixedly connected to an end cover plate, and a plurality of pressure relief ports are provided on the surface of the end cover plate.

[0008] Optionally, the left end shell is a straight cylinder structure, one end of the left end shell is integrally connected with an end cover plate, the end cover plate closes the bottom surface of one end of the left end shell, and the other end of the left end shell is integrally connected with a flange cover.

[0009] Optionally, a waterproof groove is provided on the inner surface of the flange cover, and the sealing ring is embedded in the waterproof groove and embeddedly connected with the flange cover.

[0010] Optionally, the right end shell is a straight cylinder structure, one end of the right end shell is integrally connected with an end cover plate, the end cover plate closes the bottom surface of one end of the right end shell, and the other end of the right end shell is integrally connected with a flange.

[0011] Optionally, a main cable outlet hole is opened in the middle of the surface of the end cover plate, and grounding wire outlet holes, multiple groups of pressure relief ports and secondary equipment reserved holes are respectively opened around the main cable outlet hole.

[0012] Optionally, sealing gaskets are pasted on the inner walls of the main cable outlet hole, the grounding wire outlet hole and the secondary equipment reserved hole.

[0013] Optionally, a sealing cover is provided at the reserved hole for the secondary equipment, the sealing cover is connected to the end cover plate by bolts, and a sealing ring is sandwiched between the sealing cover and the end cover plate, and the sealing cover seals the reserved hole for the secondary equipment through the sealing ring.

[0014] Optionally, a pressure relief cover is embedded in the pressure relief port, the pressure relief cover is sealingly clamped with the end cover plate, and the pressure relief cover is made of plastic material.

[0015] Optionally, a flange cover and a flange plate are respectively provided at two ends of the intermediate shell, and the flange cover and the flange plate are integrally connected to the intermediate shell.

[0016] Optionally, two groups of core-fixing rubber pads are symmetrically distributed inside the left end shell, the right end shell and the middle shell. The core-fixing rubber pads are fixedly connected to the inner walls of the corresponding shells. The middle joint is coaxially clamped with the left end shell, the right end shell or the middle shell through the core-fixing rubber pads. The cross-section of the core-fixing rubber pads is a superimposed M-shaped structure, and the core-fixing rubber pads are made of rubber material.

[0017] Compared with the prior art, the utility model has at least the following beneficial effects:

[0018] In the above scheme, by setting the left end shell, the right end shell and the middle shell, the left end shell, the right end shell and the middle shell can be combined into an explosion-proof box by bolt connection. The explosion-proof box adopts a split design for easy separate transportation. Compared with the integrated explosion-proof box, the left end shell, the right end shell and the middle shell are small in size and light in weight, easy to carry and install, and the number of middle shells between the two groups of end shells can be increased or decreased as needed. By increasing or decreasing the number of middle shells, the length of the explosion-proof box can be adjusted, so that it can adapt to most cable connectors on the market, increasing practicality.

[0019] By setting the end cover plate, one of the end faces of the left end shell and the right end shell are integrally connected with the end cover plate, and multiple groups of pressure relief ports are opened on the surface of the end cover plate, and pressure relief covers are embedded in the pressure relief ports to seal them. When the middle joint catches fire and explodes due to short circuit or other reasons, the pressure inside the explosion-proof box will break the pressure relief cover, and reduce the pressure inside the explosion-proof box through the pressure relief port, thereby increasing the pressure resistance of the explosion-proof box. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which are incorporated herein and constitute part of the specification, illustrate embodiments of the present invention and, together with the description, further serve to explain the principles of the present invention and enable those skilled in the relevant art to make and use the present invention.

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of a segmented combined explosion-proof box used for a cable intermediate joint;

[0022] Figure 2 It is a schematic diagram of the internal structure of the left end shell, the middle shell and the right end shell;

[0023] Figure 3 It is a structural schematic diagram of the left end shell;

[0024] Figure 4 It is a schematic diagram of the cut-away internal structure of the intermediate shell;

[0025] Figure 5 It is a schematic diagram of the structure of the right end shell.

[0026] [reference numerals]

[0027] 1. Left end shell; 2. Middle shell; 3. Right end shell; 4. Pressure relief cover; 5. Sealing cover; 6. Sealing ring; 7. Middle joint; 8. Sealing gasket; 9. Flange cover; 91. Waterproof groove; 10. Flange plate; 11. Centering rubber pad; 12. End cover plate; 111. Main cable outlet hole; 112. Ground wire outlet hole; 113. Pressure relief port; 114. Reserved hole for secondary equipment.

[0028] As shown in the figure, in order to clearly implement the structure of the embodiment of the utility model, specific structures and devices are marked in the figure, but this is only for illustrative purposes and is not intended to limit the utility model to the specific structure, device and environment. According to specific needs, ordinary technicians in this field can adjust or modify these devices and environments. DETAILED DESCRIPTION

[0029] The following is a detailed description of a segmented combined explosion-proof box for a cable intermediate joint provided by the utility model in combination with the accompanying drawings and specific embodiments. At the same time, it is explained here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art may also adopt other alternatives to implement some known technologies; and the accompanying drawings are only for a more specific description of the embodiments, and are not intended to specifically limit the utility model.

[0030] It should be noted that the references to "one embodiment", "an embodiment", "an exemplary embodiment", "some embodiments" and the like in the specification indicate that the embodiments described may include specific features, structures or characteristics, but not every embodiment may include the specific features, structures or characteristics. In addition, when a specific feature, structure or characteristic is described in conjunction with an embodiment, it should be within the knowledge of a person skilled in the art to implement such feature, structure or characteristic in conjunction with other embodiments (whether or not explicitly described).

[0031] In general, a term can be understood, at least in part, from its use in context. For example, depending, at least in part, on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey an exclusive set of factors, but can instead, depending, at least in part, on the context, allow for the presence of other factors that are not necessarily explicitly described.

[0032] It is to be understood that the meanings of “on,” “over,” and “above” in the present invention should be interpreted in the broadest manner, so that “on” not only means “directly on” something, but also includes the meaning of being “on” something with intervening features or layers, and “on” or “above” not only means “on” or “above” something, but also includes the meaning of being “on” or “above” something with no intervening features or layers.

[0033] Additionally, spatially relative terms such as "under," "beneath," "lower," "above," "upper," and the like may be used herein for descriptive convenience to describe the relationship of one element or feature to another element or features, as shown in the accompanying drawings. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially relative descriptors used herein may be similarly interpreted accordingly.

[0034] like Figure 1 and Figure 2 As shown, the embodiment of the utility model provides a segmented combined explosion-proof box for a cable intermediate joint, comprising a left end shell 1, a right end shell 3 and an intermediate shell 2, wherein the intermediate shell 2 is arranged between the left end shell 1 and the right end shell 3, and the left end shell 1, the right end shell 3 and the intermediate shell 2 are connected and combined into an explosion-proof box by bolts. The explosion-proof box adopts a split design for easy separate transportation. Compared with the integrated explosion-proof box, the left end shell 1, the right end shell 3 and the intermediate shell 2 are small in size and light in weight, convenient for carrying and installation, and the length of the explosion-proof box can be changed with the increase or decrease of the number of the intermediate shells 2, so that it can adapt to the market The majority of cable connectors are installed on the explosion-proof box to increase practicality. An intermediate joint 7 is arranged in the middle of the explosion-proof box composed of the left end shell 1, the right end shell 3 and the middle shell 2. Sealing rings 6 are respectively arranged between the left end shell 1 and the right end shell 3 and the middle shell 2. The left end shell 1 and the right end shell 3 are sealed and connected to the middle shell 2 through the sealing ring 6. One end face of the left end shell 1 and the right end shell 3 is fixedly connected with an end cover plate 12. A plurality of pressure relief ports 113 are arranged on the surface of the end cover plate 12. The pressure relief ports 113 can quickly reduce the high pressure in the explosion-proof box when the intermediate joint 7 inside the explosion-proof box explodes, so as to increase the explosion-proof performance of the explosion-proof box.

[0035] like Figure 2 and Figure 3As shown, the left end shell 1 is a straight tube structure, one end of the left end shell 1 is integrally connected with an end cover plate 12, the end cover plate 12 closes the bottom surface of one end of the left end shell 1, the other end of the left end shell 1 is integrally connected with a flange cover 9, the inner surface of the flange cover 9 is provided with a waterproof groove 91, the sealing ring 6 is embedded in the waterproof groove 91 and is embedded in the flange cover 9, the waterproof groove 91 can increase the waterproof function of the flange cover 9, and the sealing ring 6 is embedded in the waterproof groove 91 to further increase the sealing of the explosion-proof box. The right end shell 3 is a straight tube structure The right end shell 3 has a structure in which an end cover plate 12 is integrally connected to one end of the right end shell 3, and the end cover plate 12 closes the bottom surface of one end of the right end shell 3. The other end of the right end shell 3 is integrally connected to a flange 10, and the structure of the flange 10 is compatible with the structure of the flange cover 9. The flange 10 can be embedded in the flange cover 9 and connected thereto by bolts. The sealing ring 6 clamped between the flange 10 and the flange cover 9 can close the gap between the flange 10 and the flange cover 9 to the maximum extent, thereby avoiding water seepage between the flange 10 and the flange cover 9.

[0036] like Figure 2 and Figure 5 As shown, a main cable outlet hole 111 is opened in the middle of the surface of the end cover plate 12, and grounding wire outlet holes 112, multiple pressure relief ports 113 and secondary equipment reserved holes 114 are opened around the main cable outlet hole 111. The main cable outlet hole 111, the grounding wire outlet hole 112 and the secondary equipment, the sealing gasket 8 is made of rubber material, and when the cable, the grounding wire and other connecting wires pass through the corresponding main cable outlet hole 111, the grounding wire outlet hole 112 and the secondary equipment reserved hole 114, the sealing gasket 8 can increase the sealing of the explosion-proof box to prevent moisture. The water vapor enters the explosion-proof box from the main cable outlet hole 111, the ground wire outlet hole 112 and the secondary equipment reserved hole 114, which effectively increases the waterproofness of the explosion-proof box. A sealing cover 5 is provided at the secondary equipment reserved hole 114. The sealing cover 5 is connected to the end cover plate 12 by bolts, and a sealing ring 6 is sandwiched between the sealing cover 5 and the end cover plate 12. The sealing cover 5 seals the secondary equipment reserved hole 114 through the sealing ring 6. When the secondary equipment reserved hole 114 is not in use, it is closed by the sealing cover 5 to prevent foreign substances such as water and dust from entering the explosion-proof box and affecting the middle joint 7.

[0037] like Figure 1 and Figure 2As shown, a pressure relief cover 4 is embedded in the pressure relief port 113, and the pressure relief cover 4 is sealed and clamped with the end cover plate 12. The pressure relief cover 4 is made of plastic material. The main function of the pressure relief port 113 is to reduce the pressure when the pressure inside the explosion-proof box is too high due to the excessive temperature. The pressure relief port 113 is sealed with the pressure relief cover 4 under normal conditions to prevent water, dust and other foreign substances from entering the explosion-proof box and affecting the intermediate joint 7, so as to maintain the waterproofness of the explosion-proof box. When the explosion of the cable intermediate joint 7 causes the internal pressure of the explosion-proof box to rise sharply, the strong pressure will destroy the connection between the pressure relief cover 4 and the end cover plate 12, and the pressure relief port 113 will be opened. The pressure in the explosion-proof box will drop rapidly to prevent the explosion-proof box from being blown up due to excessive pressure, thereby increasing the explosion-proof characteristics of the explosion-proof box.

[0038] like Figure 4 As shown, the two ends of the intermediate shell 2 are respectively provided with a flange cover 9 and a flange plate 10, and the flange cover 9 and the flange plate 10 are integrally connected to the intermediate shell 2. When the intermediate shell 2 is respectively connected to the left end shell 1 and the right end shell 3, the flange plate 10 on the intermediate shell 2 is embedded in the flange cover 9 on the left end shell 1, and the flange plate 10 on the right end shell 3 is embedded in the flange cover 9 on the intermediate shell 2, and a sealing ring 6 is clamped between the flange plate 10 and the flange cover 9 to ensure that the connection is sufficiently sealed. Two groups of centering rubber pads 11 are symmetrically distributed inside the left end shell 1, the right end shell 3 and the intermediate shell 2. The centering rubber pads 11 It is fixedly connected to the inner wall of the corresponding shell, and the middle joint 7 is coaxially clamped with the left end shell 1, the right end shell 3 or the middle shell 2 through the core-fixing rubber pad 11. The cross-section of the core-fixing rubber pad 11 is a superimposed M-shaped structure. The core-fixing rubber pad 11 is made of rubber material. The core-fixing rubber pad 11 has a certain elasticity due to its structural design and material, and the surface of the core-fixing rubber pad 11 is an arc structure. The central axis of the arc surface coincides with the central axis of the left end shell 1, the right end shell 3 and the middle shell 2. The middle joint 7 can be quickly coaxially positioned with the left end shell 1, the right end shell 3 and the middle shell 2 through the core-fixing rubber pad 11, thereby improving the installation efficiency.

[0039] The working principle provided by the utility model is that when an explosion-proof box is used for the intermediate joint 7, the main cable can be firstly passed through the main cable outlet holes 111 on the left end shell 1 and the right end shell 3 respectively, and the grounding wire is grounded through the grounding wire outlet hole 112, and then the intermediate joint 7 is arranged between the left end shell 1 and the right end shell 3 and connected to the two groups of main cables respectively, and then the intermediate joint 7 is positioned respectively through the centering rubber pads 11 in the left end shell 1 and the right end shell 3, and finally the left end shell 1 is connected to the right end shell 3 by bolts.

[0040] If the length of the middle joint 7 is greater than the capacity of the left-end shell 1 and the right-end shell 3, an intermediate shell 2 can be added between the left-end shell 1 and the right-end shell 3, and the intermediate shell 2 is sleeved on the middle joint 7 and positioned by the centering rubber pad 11 before being connected to the main cable. After the line connection is completed, the left-end shell 1, the intermediate shell 2 and the right-end shell 3 can be connected respectively by bolts.

[0041] The present invention covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present invention. In order to make the public have a thorough understanding of the present invention, specific details are described in detail in the following preferred embodiments of the present invention, and those skilled in the art can fully understand the present invention without the description of these details. In addition, in order to avoid unnecessary confusion about the essence of the present invention, well-known methods, processes, procedures, components and circuits are not described in detail.

[0042] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A segmented combined explosion-proof box for a cable intermediate joint, characterized in that: It includes an end shell, a right end shell and an intermediate shell, an intermediate shell is arranged between the left end shell and the right end shell, and the left end shell, the right end shell and the intermediate shell are connected and assembled into an explosion-proof box by bolts, and the length of the explosion-proof box can be changed with the increase or decrease of the number of intermediate shells; An intermediate joint is arranged in the middle of the explosion-proof box composed of the left end shell, the right end shell and the intermediate shell; A sealing ring is provided between the left end shell and the right end shell and the middle shell respectively, and the left end shell and the right end shell are sealed and connected to the middle shell through the sealing ring; An end cover plate is fixedly connected to one end surface of the left end shell and the right end shell, and a plurality of pressure relief ports are arranged on the surface of the end cover plate.

2. The segmented combined explosion-proof box for cable intermediate joints according to claim 1 is characterized in that: The left end shell is a straight cylinder structure, one end of the left end shell is integrally connected with an end cover plate, the end cover plate seals the bottom surface of one end of the left end shell, and the other end of the left end shell is integrally connected with a flange cover.

3. The segmented combined explosion-proof box for cable intermediate joints according to claim 2 is characterized in that: The inner surface of the flange cover is provided with a waterproof groove, and the sealing ring is embedded in the waterproof groove and embeddedly connected with the flange cover.

4. The segmented combined explosion-proof box for cable intermediate joints according to claim 1 is characterized in that: The right end shell is a straight cylinder structure, one end of the right end shell is integrally connected with an end cover plate, the end cover plate seals the bottom surface of one end of the right end shell, and the other end of the right end shell is integrally connected with a flange.

5. The segmented combined explosion-proof box for cable intermediate joint according to claim 1, characterized in that: A main cable outlet hole is provided in the middle of the surface of the end cover plate, and grounding wire outlet holes, multiple groups of pressure relief ports and secondary equipment reserved holes are respectively provided around the main cable outlet hole.

6. The segmented combined explosion-proof box for cable intermediate joints according to claim 5, characterized in that: The inner walls of the main cable outlet hole, the grounding wire outlet hole and the secondary equipment reserved hole are all pasted with sealing gaskets.

7. The segmented combined explosion-proof box for cable intermediate joints according to claim 5, characterized in that: A sealing cover is arranged at the reserved hole of the secondary equipment, the sealing cover is connected to the end cover plate by bolts, and a sealing ring is sandwiched between the sealing cover and the end cover plate, and the sealing cover seals the reserved hole of the secondary equipment through the sealing ring.

8. The segmented combined explosion-proof box for cable intermediate joints according to claim 5, characterized in that: A pressure relief cover is embedded in the pressure relief port, the pressure relief cover is sealed and clamped with the end cover plate, and the pressure relief cover is made of plastic material.

9. The segmented combined explosion-proof box for cable intermediate joints according to claim 1, characterized in that: The two ends of the intermediate shell are respectively provided with a flange cover and a flange plate, and the flange cover and the flange plate are integrally connected with the intermediate shell.

10. The segmented combined explosion-proof box for cable intermediate joints according to claim 1, characterized in that: Two groups of core-fixing rubber pads are symmetrically distributed inside the left end shell, the right end shell and the middle shell. The core-fixing rubber pads are fixedly connected to the inner walls of the corresponding shells. The middle joint is coaxially clamped with the left end shell, the right end shell or the middle shell through the core-fixing rubber pads. The cross-section of the core-fixing rubber pads is a superimposed M-shaped structure, and the core-fixing rubber pads are made of rubber material.

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