An explosion-proof terminal box

Abstract

The utility model relates to an explosion -proof terminal box. Including the casing, the bottom necking of casing is equipped with sealing assembly, is equipped with the base sleeve in the side of casing and is equipped with sealing assembly in the end, the top of casing is open and is installed with the detachable upper cover, is equipped with annular inner boss in the inner chamber middle part of casing and is installed with detachable terminal in annular inner boss, terminal includes the intermediate disc and the first terminal block and the second terminal block who are located respectively in its both sides, is equipped with a plurality of first side recess on the first terminal block, is equipped with a plurality of second side recess on the second terminal block, each first side recess and each second side recess are in the axial direction opposite, is equipped with the terminal bolt of axial penetration in each first side recess and each second side recess, each terminal bolt fixes first terminal block, intermediate disc and second terminal block as a whole while wiring, the utility model improves the convenience of wiring operation, guarantees that the inside joint can be good isolated each other after wiring, improves the reliability and stability of wiring.

Description

Technical Field

[0001] This utility model belongs to the field of explosion-proof equipment technology, and in particular relates to an explosion-proof junction box. Background Technology

[0002] Explosion-proof junction boxes are a type of junction box product used in explosion-proof scenarios. Their function is to perform wiring within an explosion-proof environment. By wiring inside the box, sparks from the wiring connections prevent the ignition of flammable and explosive gases or dust in the surrounding environment, thus achieving the purpose of explosion-proof safety. With the rapid development of industries such as petrochemicals, metal smelting, and pharmaceuticals, various types of explosion-proof junction boxes are being used more and more widely in system control.

[0003] Existing explosion-proof junction boxes often have messy internal wiring. When multiple cables are connected inside the box, the lack of proper insulation between cable connectors leads to contact. Even with good insulation, friction between connectors can easily occur due to environmental vibrations and other factors during practical applications, resulting in insulation damage. Therefore, it is necessary to develop and design an explosion-proof junction box structure to solve the aforementioned technical problems. Summary of the Invention

[0004] The purpose of this utility model is to provide an explosion-proof junction box that improves the convenience of wiring operations, ensures good isolation between internal connectors after wiring, and enhances the reliability and stability of wiring.

[0005] The technical solution adopted by this utility model is as follows: an explosion-proof junction box includes a housing, the bottom of the housing is constricted and provided with a sealing component, a base sleeve is provided on the side of the housing and a sealing component is provided at the end, the top of the housing is open and a detachable top cover is installed; an annular inner boss is provided in the middle of the inner cavity of the housing and a detachable connector is installed on the annular inner boss; the connector includes a middle plate and a first terminal block and a second terminal block located on both sides of it, a plurality of first side grooves are provided on the first terminal block and a plurality of second side grooves are provided on the second terminal block, each first side groove and each second side groove are axially aligned, and an axially penetrating wiring bolt is provided in each first side groove and each second side groove, and each wiring bolt fixes the first terminal block, the middle plate and the second terminal block into one piece while wiring.

[0006] Preferably, the first side grooves are arranged at equal angular intervals in the circumferential direction, and the second side grooves are arranged at equal angular intervals in the circumferential direction. An intermediate groove is provided in the middle of the first terminal block and the second terminal block, and the two intermediate grooves are facing each other in the axial direction. An axially penetrating terminal bolt is provided in the two intermediate grooves.

[0007] Preferably, it further includes a support plate with a window in the middle, the cross-sectional shape of the window being the same as the cross-sectional shape of the middle plate, and the thickness of the support plate being greater than or equal to the thickness of the middle plate; the middle plate is located inside the window of the support plate and the first terminal block and the second terminal block clamp the support plate.

[0008] Preferably, the support plate has multiple connecting holes on its side and threaded holes at corresponding positions on the annular inner boss of the housing. The support plate is fixedly connected to the annular inner boss using multiple assembly screws.

[0009] Preferably, the housing consists of a lower housing and an upper housing; the upper cover is threaded to the upper part of the upper housing, an annular gasket is provided in the middle of the upper housing, and a sealing ring is provided between the bottom opening of the upper cover and the annular gasket.

[0010] Preferably, a tool engagement groove for inserting a screwing tool is provided at the top center of the top cover, and a connecting chain is also provided between the top cover and the outer shell.

[0011] Preferably, the bottom sealing assembly includes sealing packing inserted into the bottom opening of the lower housing, a washer located below the sealing packing, and a bottom lock nut for pushing the washer; the side sealing assembly includes sealing packing inserted into the base sleeve, a washer located outside the sealing packing, and a side lock nut for pushing the washer.

[0012] Preferably, a first boss and a second boss are provided on both sides of the root of the base sleeve. A ground wire is connected to the first boss by a fixing screw. One end of the connecting chain is fixedly connected to the second boss by a fixing screw, and the other end is fixedly connected to the top cover by a fixing screw.

[0013] Preferably, a fixing base is also provided on the side wall of the upper housing, and the explosion-proof junction box is installed and fixed through the fixing base.

[0014] The advantages and positive effects of this utility model are: This invention provides an explosion-proof junction box. Compared with existing explosion-proof junction boxes, this invention features an internal annular boss and a support plate for mounting a detachable connector. The connector has multiple axially penetrating bolts, thus providing multiple circumferentially distributed wiring positions. After wiring, this effectively isolates cable connectors from each other, preventing contact and friction within the junction box and improving wiring reliability and stability. Furthermore, the detachable connector and removable top cover allow for convenient wiring operations. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the external structure of this utility model; Figure 2This is a cross-sectional structural schematic diagram of the present invention; Figure 3 yes Figure 2 A three-dimensional structural diagram of the connector.

[0016] In the picture: 1. Bottom lock nut; 2. Lower housing; 3. Connecting chain; 4. Fixing base; 5. Top cover; 6. Tool engagement groove; 7. First boss; 8. Base sleeve; 9. Side lock nut; 10. Second boss; 11. Fixing screw; 12. Annular washer; 13. Sealing ring; 14. Upper housing; 15. Support plate; 16. Connector; 16-1. First terminal block; 16-2. Intermediate plate; 16-3. Second terminal block; 16-4. First side groove; 16-5. Second side groove; 16-6. Intermediate groove; 16-7. Terminal bolt; 17. Assembly screw. Detailed Implementation

[0017] To further understand the invention content, features and effects of this utility model, the following embodiments are provided in detail.

[0018] Please see Figure 1 and Figure 2 The explosion-proof junction box of this utility model includes a housing, the bottom of the housing is narrowed and a sealing component is provided, a base sleeve 8 is provided on the side of the housing and a sealing component is provided at the end, and the top of the housing is open and a removable top cover 5 is installed.

[0019] In this embodiment, the housing consists of a lower housing 2 and an upper housing 14. The upper cover 5 is threadedly connected to the upper part of the upper housing 14. An annular gasket 12 is provided in the middle of the upper housing 14, and a sealing ring 13 is provided between the bottom opening of the upper cover 5 and the annular gasket 12. After the internal wiring is completed, the upper cover 5 is installed to seal the inner cavity of the junction box. The function of the sealing ring 13 is to improve the sealing characteristics of the upper cover 5 after installation and ensure the explosion-proof effect.

[0020] In this embodiment, a tool engaging groove 6 for inserting a screwing tool is provided at the top center of the upper cover 5, and a connecting chain 3 is also provided between the upper cover 5 and the outer shell. The purpose of providing the tool engaging groove 6 is to improve the convenience of disassembling and assembling the upper cover 5. After the upper cover 5 is installed, it can be fully tightened by the screwing tool to fully compress the sealing ring 13, thereby achieving a better sealing effect. The purpose of providing the connecting chain 3 is to connect the upper cover 5 to the outer shell, thus avoiding the problem of loss caused by the upper cover 5 separating from the outer shell after being removed from it.

[0021] In this embodiment, the bottom sealing assembly includes sealing filler inserted into the bottom opening of the lower housing 2, a washer located below the sealing filler, and a bottom lock nut 1 for pushing the washer. The side sealing assembly includes sealing filler inserted into the base sleeve 8, a washer located outside the sealing filler, and a side lock nut 9 for pushing the washer. The bottom lock nut 1 and the bottom opening of the lower housing 2, and the side lock nut 9 and the port of the base sleeve 8 are both threadedly connected. The cable passes through the sealing assembly into the junction box. After the cable is threaded through, the bottom lock nut 1 and the side lock nut 9 are screwed on from the outside. The bottom lock nut 1 and the side lock nut 9 move inward, pressing against the washer and the sealing filler. The sealing filler deforms and blocks the channel where the cable is located, achieving an explosion-proof seal.

[0022] An annular inner boss is provided in the middle of the inner cavity of the housing, and a detachable connector 16 is installed on the annular inner boss. The connector 16 is used for wiring multiple sets of cables inside the box. Furthermore, a support plate 15 is also included. The connector 16 is fixedly connected to the annular inner boss inside the box through the support plate 15, and the support plate 15 and the annular inner boss are detachably connected.

[0023] Please see Figure 2 and Figure 3 It can be seen that: The connector 16 includes an intermediate plate 16-2 and a first terminal block 16-1 and a second terminal block 16-3 located on its two sides respectively. The first terminal block 16-1 is provided with a plurality of first side grooves 16-4, and the second terminal block 16-3 is provided with a plurality of second side grooves 16-5. Each first side groove 16-4 and each second side groove 16-5 are axially aligned. Each first side groove 16-4 and each second side groove 16-5 is provided with an axially penetrating terminal bolt 16-7. Each terminal bolt 16-7 fixes the first terminal block 16-1, the intermediate plate 16-2 and the second terminal block 16-3 into one unit while connecting the wires.

[0024] In this embodiment, each of the first side grooves 16-4 is arranged at equal angular intervals in the circumferential direction, and each of the second side grooves 16-5 is arranged at equal angular intervals in the circumferential direction. A middle groove 16-6 is provided in the middle of the first terminal block 16-1 and the second terminal block 16-3, and the two middle grooves 16-6 are directly opposite each other in the axial direction. An axially penetrating terminal bolt 16-7 is provided in the two middle grooves 16-6.

[0025] like Figure 3As shown, there are ten first side grooves 16-4 and ten second side grooves 16-5, and correspondingly, there are ten wiring bolts 16-7 on the side. The middle groove 16-6 is an elongated groove with two wiring bolts 16-7 inside. Therefore, the connector 16 has a total of twelve wiring bolts 16-7, which can be used to connect twelve sets of cables at the same time.

[0026] In this embodiment, a window is provided in the middle of the support plate 15, and the cross-sectional shape of the window is the same as that of the intermediate disk 16-2. The thickness of the support plate 15 is greater than or equal to the thickness of the intermediate disk 16-2. The intermediate disk 16-2 is located inside the window of the support plate 15, and the first terminal block 16-1 and the second terminal block 16-3 clamp the support plate. Furthermore, multiple connecting holes are provided on the side of the support plate 15, and threaded holes are provided at corresponding positions on the annular inner boss of the housing. The support plate 15 is fixedly connected to the annular inner boss using multiple assembly screws 17.

[0027] In this embodiment, a first boss 7 and a second boss 10 are respectively provided on both sides of the root of the base sleeve 8. A ground wire is connected to the first boss 7 by a fixing screw 11. One end of the connecting chain 3 is fixedly connected to the second boss 10 by a fixing screw 11, and the other end is fixedly connected to the top cover 5 by a fixing screw 11.

[0028] In this embodiment, a fixing base 4 is also provided on the side wall of the upper housing 14. The explosion-proof junction box is installed and fixed through the fixing base 4. In the application site, the explosion-proof junction box can be installed and fixed on the bracket. As shown in the figure, the fixing base 4 is a boss integrally formed on the housing. Threaded connection holes are provided on the side of the boss. In this way, the explosion-proof junction box can be fixedly connected to the on-site bracket by screws in the application site.

[0029] How to use: Before wiring, remove the top cover 5 and remove all assembly screws 17. This allows the support plate 15 and connector 16 to be removed from the inner cavity of the junction box, enabling the wiring of multiple cables outside the box. Specifically, depending on the number of cables, loosen the wiring bolts 16-7 in multiple positions. Then, insert one set of cables into the box through the base sleeve 8 and another set of cables into the box from the bottom upwards. Wrap the metal wire ends of the cables inserted from the side around the wiring bolts 16-7 in the first side groove 16-4, and wrap the technical wire ends of the cables inserted from the bottom around the wiring bolts 16-7 in the second side groove 16-5, paying attention to the correspondence between the cables. Then, retighten all wiring bolts 16-7. Reinsert the support plate 5 and connector 16 into the inner cavity of the junction box, and use multiple assembly screws 17 to fix the support plate 15 to the annular inner boss; then install the top cover 15 and tighten it fully to ensure a sealing effect. Then tighten the bottom lock nut 1 and the side lock nut 9. The lock nut deforms by squeezing the sealing filler through the internal washer to seal the channel where the cable is located, ensuring the explosion-proof sealing effect.

Claims

1. An explosion-proof junction box, characterized in that: The device includes a housing with a constricted bottom and a sealing assembly, a base sleeve (8) on the side of the housing and a sealing assembly at the end, and an open top with a removable top cover (5). An annular inner boss is located in the middle of the housing cavity, and a removable connector (16) is mounted on the annular inner boss. The connector (16) includes a central plate (16-2) and a first connector (16-1) and a second connector (16-3) located on either side of it. Multiple first side connectors are provided on the first connector (16-1). The first side groove (16-4) and the second side groove (16-5) are provided on the second terminal block (16-3). Each first side groove (16-4) and each second side groove (16-5) are axially aligned. Each first side groove (16-4) and each second side groove (16-5) is provided with an axially penetrating wiring bolt (16-7). Each wiring bolt (16-7) fixes the first terminal block (16-1), the intermediate plate (16-2) and the second terminal block (16-3) into one unit while wiring.

2. The explosion-proof junction box as described in claim 1, characterized in that: Each first side groove (16-4) is arranged at equal angular intervals in the circumferential direction, and each second side groove (16-5) is arranged at equal angular intervals in the circumferential direction. A middle groove (16-6) is provided in the middle of the first terminal block (16-1) and the second terminal block (16-3), and the two middle grooves (16-6) are directly opposite each other in the axial direction. An axially penetrating terminal bolt (16-7) is provided in the two middle grooves (16-6).

3. The explosion-proof junction box as described in claim 2, characterized in that: It also includes a support plate (15) with a window in the middle, the cross-sectional shape of the window is the same as the cross-sectional shape of the middle plate (16-2), the thickness of the support plate (15) is greater than or equal to the thickness of the middle plate (16-2); the middle plate (16-2) is located inside the window of the support plate (15) and the first terminal block (16-1) and the second terminal block (16-3) clamp the support plate (15).

4. The explosion-proof junction box as described in claim 3, characterized in that: Multiple connection holes are provided on the side of the support plate (15), and threaded holes are provided at the corresponding positions on the annular inner boss of the housing. The support plate (15) is fixedly connected to the annular inner boss by multiple assembly screws (17).

5. The explosion-proof junction box as described in claim 4, characterized in that: The housing consists of a lower housing (2) and an upper housing (14); the upper cover (5) is threaded to the upper part of the upper housing (14), an annular pad (12) is provided in the middle of the upper housing (14), and a sealing ring (13) is provided between the bottom opening of the upper cover (5) and the annular pad (12).

6. The explosion-proof junction box as described in claim 5, characterized in that: A tool fitting groove (6) for inserting a screwing tool is provided at the top center of the top cover (5), and a connecting chain (3) is also provided between the top cover (5) and the outer shell.

7. The explosion-proof junction box as described in claim 6, characterized in that: The bottom sealing assembly includes a sealing packing inserted into the bottom opening of the lower housing (2), a gasket located below the sealing packing, and a bottom lock nut (1) for pushing the gasket; the side sealing assembly includes a sealing packing inserted into the base sleeve (8), a gasket located outside the sealing packing, and a side lock nut (9) for pushing the gasket.

8. The explosion-proof junction box as described in claim 7, characterized in that: A first boss (7) and a second boss (10) are provided on both sides of the root of the base sleeve (8). A fixing screw (11) is used to connect the ground wire on the first boss (7). One end of the connecting chain (3) is fixedly connected to the second boss (10) with a fixing screw (11), and the other end is fixedly connected to the top cover (5) with a fixing screw (11).

9. The explosion-proof junction box as described in claim 8, characterized in that: A fixed base (4) is also provided on the side wall of the upper housing (14), and the explosion-proof junction box is installed and fixed through the fixed base (4).

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