Explosion-proof main control double-port integrated junction box

Abstract

The utility model belongs to the technical field of motor fittings relates to a kind of explosion-proof main control double-port integrated terminal box, including terminal box body, one is outwardly expanding diameter and extending conical connecting part is arranged on the terminal box body, the end of the conical connecting part is provided with the first wire outlet unit for being threaded power line, the sidewall of the conical connecting part is provided with the second wire outlet unit for being threaded control line, the second wire outlet unit includes boss, explosion-proof thread is machined on the boss, and explosion-proof sealing assembly is equipped with. The explosion-proof main control double-port integrated terminal box provided by the utility model can improve the anti-explosion safety and operation convenience.

Description

Technical Field

[0001] This utility model belongs to the technical field of motor accessories and relates to an explosion-proof main control dual-port integrated junction box. Background Technology

[0002] With the development of industrial automation and intelligence, the functional requirements for explosion-proof motors are increasing, such as the need for automatic power-off control functions when the motor temperature rises above the standard. Therefore, explosion-proof motors typically require the selection of control components such as PTC thermistors or thermal switches.

[0003] Currently, while junction boxes for explosion-proof motors have been developed with structures capable of housing the aforementioned components, their cable outlets generally share a single outlet for both the power and control cables. This approach has significant drawbacks: the shared outlet structure forces both the power and control cables (or dummy cables used to fill space) to exit from and be sealed simultaneously through a single opening. However, variations in cable specifications, quantity, and filler materials make it difficult to achieve optimal and consistent clamping and sealing effects for the glands or sealing rings at various configurations. This is especially true when power and control cables are mixed, making sealing more challenging and creating weak points in the explosion-proof system. To address this safety hazard, customers are often forced to use explosion-proof putty or similar materials for remedial measures. This not only increases operating costs but also increases the risk of damage to the explosion-proof surface, leading to its failure and causing operational inconvenience and uncertainty. Utility Model Content

[0004] This utility model addresses the shortcomings of existing technologies by providing an explosion-proof main control dual-port integrated junction box, which can improve explosion-proof safety and ease of operation.

[0005] To solve the above-mentioned technical problems, the objective of this utility model is achieved through the following technical solution: An explosion-proof main control dual-port integrated junction box includes a junction box body. The junction box body is provided with a tapered connecting part that extends outward in diameter. The end of the tapered connecting part is provided with a first outgoing unit for passing through a power line. The side wall of the tapered connecting part is provided with a second outgoing unit for passing through a control line. The second outgoing unit includes a boss. The boss is machined with explosion-proof threads and is equipped with an explosion-proof sealing assembly.

[0006] In the aforementioned explosion-proof main control dual-port integrated junction box, the junction box body is provided with six power line terminals and two control line terminals, corresponding to six power lines and two control lines respectively. Preferably, the power line terminals are of type M6 and the control line terminals are of type M4.

[0007] In the aforementioned explosion-proof dual-port integrated junction box, the explosion-proof sealing assembly of the second outgoing unit includes a detachable EX explosion-proof plug; when no control element is installed inside the junction box body, the EX explosion-proof plug seals the second outgoing unit.

[0008] In the aforementioned explosion-proof main control dual-port integrated junction box, the explosion-proof sealing assembly of the second outgoing unit further includes an internal tooth locking washer and an explosion-proof gland. The internal tooth locking washer is fitted onto the boss, and the explosion-proof gland is screwed into the explosion-proof thread on the boss. The EX explosion-proof plug is installed on the outer end of the explosion-proof gland.

[0009] In the aforementioned explosion-proof dual-port integrated junction box, the junction box body includes a front box and a rear box that are connected together. An explosion-proof sealing surface is provided at the joint between the front box and the rear box. The conical connecting part and the first outgoing unit are formed by the corresponding structure combination of the front box and the rear box. The boss of the second outgoing unit is provided on the front box.

[0010] In the aforementioned explosion-proof dual-port integrated junction box, the boss is an arched doorway structure with its arch facing forward.

[0011] In the aforementioned explosion-proof dual-port integrated junction box, the angle between the axis of the first outgoing unit and the axis of the second outgoing unit is 50-70°; preferably, the angle between the axis of the first outgoing unit and the axis of the second outgoing unit is 60°.

[0012] In the aforementioned explosion-proof dual-port integrated junction box, the cross-section of the tapered connecting part is elliptical, with its major axis extending in the left-right direction, and the second outgoing unit is located to the side of the direction of the major axis of the ellipse.

[0013] Compared with the prior art, this utility model has the following advantages: 1. This utility model provides an explosion-proof dual-port integrated junction box for main control, achieving a qualitative leap in explosion-proof safety through the complete separation of the main control circuit in its physical structure. The power line and control line each have their own independent, non-interfering outgoing units and explosion-proof sealed channels. This design fundamentally eliminates the inherent risks of poor sealing and explosion-proof failure caused by variations in the number and specifications of cables in traditional shared outgoing ports. More importantly, it completely isolates the operational risks that may be introduced by frequent changes in the control circuit from the core explosion-proof surface of the main box, ensuring that the power circuit's seal remains stable and undisturbed for a long time, thus achieving a fundamental improvement in overall explosion-proof performance.

[0014] 2. This utility model innovatively achieves seamless and reliable switching between the junction box and two working modes: "pure power" and "power + control". When the control function is required, an explosion-proof gland is installed to lead out the control line; when the control function is not required, a standard EX explosion-proof plug is screwed on to completely and properly seal the outlet. This greatly improves the product's market adaptability and ease of use. Attached Figure Description

[0015] Figure 1 This is a perspective view of the present invention; Figure 2 This is a cross-sectional view of the present invention; Figure 3 This is an exploded view of this utility model; Reference numerals in the attached drawings: 1. Junction box body; 1a. Front box; 1b. Rear box; 2. Tapered connection part; 3. First cable outlet unit; 4. Second cable outlet unit; 5. Boss; 6. Internal tooth locking washer; 7. Explosion-proof gland. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. See also: Figure 1-3 : An explosion-proof main control dual-port integrated junction box includes a junction box body 1. The junction box body 1 is provided with a tapered connecting part 2 that extends outward. The end of the tapered connecting part 2 is provided with a first outgoing unit 3 for passing through a power line. The side wall of the tapered connecting part 2 is provided with a second outgoing unit 4 for passing through a control line. The second outgoing unit 4 includes a boss 5. The boss 5 is machined with explosion-proof threads and is equipped with an explosion-proof sealing assembly.

[0017] The usage method of this embodiment is as follows: Power line connection and sealing: An external power cable is introduced from the inlet end of the first outgoing unit 3 and reliably connected to the corresponding power input terminal inside the junction box. Then, the explosion-proof gland 7 or sealing device standardly provided with the first outgoing unit 3 is used to clamp and seal the power cable. Control line connection and sealing: An external control cable is introduced from the inlet end of the second outgoing unit 4 and reliably connected to the corresponding control element terminal (such as a PTC, thermal switch, etc.) inside the junction box. Then, the explosion-proof gland 7 of the second outgoing unit 4 itself is used to clamp and seal the control cable. After confirming that the wiring of the main circuit and the control circuit is correct and secure, the junction box is closed and tightened. At this time, the junction box is used as a main control integrated junction box, and both outlets are in a safe explosion-proof sealed state.

[0018] In this embodiment, the junction box body 1 is provided with six power line terminals and two control line terminals, which correspond to the six power lines and two control lines respectively. Preferably, the power line terminals are of type M6 and the control line terminals are of type M4.

[0019] Furthermore, the explosion-proof sealing assembly of the second outgoing unit 4 includes a detachable EX explosion-proof plug (not shown in the figure); when no control element is provided inside the junction box body 1, the EX explosion-proof plug seals the second outgoing unit 4.

[0020] Furthermore, the explosion-proof sealing assembly of the second outlet unit 4 also includes an internal tooth locking washer 6 and an explosion-proof gland 7. The internal tooth locking washer 6 is fitted onto the boss 5, and the explosion-proof gland 7 is screwed into the explosion-proof thread on the boss 5. The EX explosion-proof plug is installed on the outer end of the explosion-proof gland 7.

[0021] The second outlet unit 4 employs a multi-seal structure consisting of a standard boss 5 with explosion-proof threads, an internal toothed locking washer 6, an explosion-proof gland 7, and an EX explosion-proof plug, ensuring its explosion-proof performance. The assembly sequence of the second outlet unit 4 is as follows: First, place the internal toothed locking washer 6 onto the root of the boss 5. Then, screw the explosion-proof gland 7 into the explosion-proof thread and tighten it to compress the washer and form an initial seal. Finally, screw the EX explosion-proof plug into the outer end of the gland. When control functionality is required, the EX explosion-proof plug can be removed, and the control line can be passed through the explosion-proof gland 7 into the box. When control functionality is not required, keeping the plug installed ensures the explosion-proof safety of the outlet. The flexible installation and removal of the EX explosion-proof plug allows for easy switching between "on" and "off" control functions, meeting the diverse needs of different customers without altering the main structure, demonstrating strong versatility.

[0022] Furthermore, the junction box body 1 includes a front box 1a and a rear box 1b that are connected. An explosion-proof sealing surface is provided at the joint of the front box 1a and the rear box 1b. The tapered connecting part 2 and the first cable outlet unit 3 are formed by the corresponding structure combination of the front box 1a and the rear box 1b. The boss 5 of the second cable outlet unit 4 is provided on the front box 1a.

[0023] Preferably, the aforementioned boss 5 is an arched doorway structure with its arch facing forward. The arched doorway shape and the absence of sharp edges of the boss 5 can effectively protect the explosion-proof surface from impacts.

[0024] Preferably, the angle between the axis of the first outgoing unit 3 and the axis of the second outgoing unit 4 is 50-70° (see attached diagram). Figure 2 (α angle in the equation); preferably, the angle between the axis of the first outgoing unit 3 and the axis of the second outgoing unit 4 is 60°.

[0025] Preferably, the cross-section of the tapered connecting part 2 is elliptical, with its major axis extending in the left-right direction, and the second outgoing wire unit 4 is disposed to the side in the direction of the major axis of the ellipse.

[0026] The elliptical cross-section of the tapered connector 2 and its extension along the left and right directions, combined with the 50-70° outgoing angle, provide ample space for the installation and wiring of the second outgoing unit 4, so that the power line and control line are naturally separated and do not interfere with each other, making the wiring operation more convenient.

[0027] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.

Claims

1. An explosion-proof main control dual-port integrated junction box, comprising a junction box body (1), characterized in that, The junction box body (1) is provided with a tapered connecting part (2) that extends outward with a reduced diameter. The end of the tapered connecting part (2) is provided with a first outgoing unit (3) for passing through a power line. The side wall of the tapered connecting part (2) is provided with a second outgoing unit (4) for passing through a control line. The second outgoing unit (4) includes a boss (5). The boss (5) is machined with an explosion-proof thread and is equipped with an explosion-proof sealing assembly.

2. The explosion-proof main control dual-port integrated junction box according to claim 1, characterized in that, The explosion-proof sealing assembly of the second outgoing unit (4) includes a removable EX explosion-proof plug; when no control element is provided inside the junction box body (1), the EX explosion-proof plug seals the second outgoing unit (4).

3. The explosion-proof main control dual-port integrated junction box according to claim 2, characterized in that, The explosion-proof sealing assembly of the second outgoing unit (4) also includes an internal tooth locking washer (6) and an explosion-proof gland (7). The internal tooth locking washer (6) is fitted on the boss (5), and the explosion-proof gland (7) is screwed to the explosion-proof thread on the boss (5). The EX explosion-proof plug is installed on the outer end of the explosion-proof gland (7).

4. The explosion-proof main control dual-port integrated junction box according to claim 1, characterized in that, The junction box body (1) includes a front box (1a) and a rear box (1b) that are connected. An explosion-proof sealing surface is provided at the joint of the front box (1a) and the rear box (1b). The tapered connecting part (2) and the first outgoing wire unit (3) are formed by the corresponding structure combination of the front box (1a) and the rear box (1b). The boss (5) of the second outgoing wire unit (4) is provided on the front box (1a).

5. The explosion-proof main control dual-port integrated junction box according to claim 4, characterized in that, The boss (5) is an arched doorway structure with its arch facing forward.

6. The explosion-proof main control dual-port integrated junction box according to claim 1, characterized in that, The angle between the axis of the first outgoing unit (3) and the axis of the second outgoing unit (4) is 50-70°.

7. The explosion-proof main control dual-port integrated junction box according to claim 1, characterized in that, The tapered connecting part (2) has an elliptical cross section with its major axis extending in the left-right direction, and the second outgoing line unit (4) is located on the side of the direction of the major axis of the ellipse.

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