Junction box for explosion-proof motor
By designing the junction box of the explosion-proof motor to have two cable sections insulated and sealed in a glue-sealing pool, the problem of water leakage during water pressure testing of the junction box is solved, improving assembly efficiency and reliability, and making it suitable for harsh industrial environments.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-31
- Publication Date
- 2026-03-17
AI Technical Summary
In the junction box of an explosion-proof motor, the reserved cable is prone to leakage during water pressure testing, which affects assembly efficiency and reliability.
The lead-out cable is divided into two sections, namely the first section and the second section. The bare wire ends that are connected to each other in the sealing pool are insulated by the insulation part and sealed with sealant to prevent moisture leakage.
It effectively prevents moisture leakage, improves assembly efficiency, and ensures the reliability of high-voltage explosion-proof motors in complex environments, making it suitable for harsh industrial applications.
Smart Images
Figure CN224006568U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of junction box technology for explosion-proof motors, and in particular to a junction box for explosion-proof motors. Background Technology
[0002] The temperature measurement junction box and heater junction box of the explosion-proof motor are used for wiring the temperature measurement wire and heater wire of the motor, respectively. Because it is an explosion-proof structure, in the traditional on-site assembly process, the temperature measurement wire and heater wire inside the motor need to be introduced into the junction box, and then epoxy resin is poured and sealed. After sealing, it is necessary to wait 24 hours for curing before the next step of assembly can be carried out, which seriously affects the on-site assembly efficiency.
[0003] To improve assembly efficiency, the temperature sensing cable or heater cable passing through the bottom of the junction box is usually pre-sealed with adhesive at the factory. Then, on-site, the cable leading out from the bottom of the junction box is connected to the temperature sensing cable or heater cable of the motor stator. This method effectively saves on-site assembly time, but there is a problem: when the junction box undergoes explosion-proof testing and water pressure testing, moisture inside the junction box may leak out through the gaps between the wire cores of the pre-reserved cable and the gaps between the wire cores and the cable sheath.
[0004] Therefore, there is an urgent need to provide a junction box for explosion-proof motors to solve the above-mentioned technical problems. Utility Model Content
[0005] Based on this, in order to overcome the shortcomings of the prior art, this application provides a junction box for explosion-proof motors, which can effectively prevent water leakage of the reserved cable during the hydrostatic test of the junction box, ensure the reliability of the high-voltage explosion-proof motor in complex environments, and is suitable for more stringent industrial application scenarios.
[0006] To achieve the above objectives, this application adopts the following technical solution:
[0007] This application provides a junction box for an explosion-proof motor, comprising: a junction box body, on which a protruding sealant pool is fixedly attached; a lead-out cable, the lead-out cable being divided into a first cable segment and a second cable segment; a first end of the first cable segment is located inside the junction box body, and a second end is located inside the sealant pool; a first end of the second cable segment is located outside the junction box body, and a second end is located inside the sealant pool; the second ends of the first and second cable segments are respectively configured as bare wires, the cores of the two bare wires are respectively connected to each other and the cores are insulated from each other by an insulating part; the sealant pool is sealed with sealant at the second ends of the first and second cable segments and at their connection points.
[0008] An alternative embodiment is that the insulating part includes an insulating plate, with the second ends of the first cable segment and the second cable segment respectively disposed on opposite sides of the insulating plate; a plurality of conductive connectors are disposed on the insulating plate through its opposite sides, one end of each conductive connector is connected to each core wire of the second end of the first cable segment, and the other end of each conductive connector is connected to each core wire of the second end of the second cable segment; the same conductive connector connects core wires at the same position of the first cable segment and the second cable segment.
[0009] An alternative solution is that the conductive connector includes a conductive welding pin, which penetrates the insulating plate and is fixedly connected to the insulating plate.
[0010] An alternative approach is that the insulating plate is provided with multiple through holes, which are equidistantly distributed along the length of the insulating plate; the conductive welding pins are provided in a one-to-one correspondence with the through holes, and the conductive welding pins pass through the through holes and are fixed to the insulating plate; each conductive welding pin is respectively connected to the corresponding core wire in the first section of the cable and the second section of the cable.
[0011] An alternative embodiment is that the insulating part includes an insulating sleeve; each core wire at the second end of the first cable segment and each core wire at the second end of the second cable segment are correspondingly welded in the adhesive sealing pool; the number of insulating sleeves is multiple, and each insulating sleeve is respectively fitted on the outside of each core wire at the second end of the first cable segment and each core wire at the second end of the second cable segment.
[0012] An alternative approach is to provide a gap between the inner peripheral wall of the insulating sleeve and the core wire; the gap is filled with sealant.
[0013] Alternatively, the sealant can be an epoxy resin adhesive.
[0014] An alternative is that a wire-passing hole is provided on the side of the sealing pool away from the junction box body; the second section of cable passes through the wire-passing hole, and a sealing ring is used to seal the wire-passing hole and the second section of cable.
[0015] The beneficial effects of this application are:
[0016] This application discloses a junction box for an explosion-proof motor. The pre-installed lead-out cable is divided into two sections: a first section and a second section. The bare wires of the first and second sections are stripped from their interconnected ends within a sealing tank. The cores of the two bare wires are connected correspondingly and insulated from each other by an insulating layer. The sealing tank is then sealed with sealant. Therefore, through this design, when the bare wires of the first and second sections are connected within the sealing tank, since the bare wires lack a cable sheath, no leakage gap can form between the cores and the cable sheath. Simultaneously, the cores are tightly sealed together. Insulation is achieved through the use of insulating parts, and no leakage gaps can be formed between the core wires, thus isolating the leakage path of water. During the explosion-proof water pressure test on the junction box, water leaking from the gaps between the cores of the first section of the cable and the gaps between the cores and the cable sheath cannot continue to leak into the gaps between the cores of the second section of the cable and the gaps between the cores and the cable sheath. This effectively prevents water leakage from the cable during the water pressure test, thereby improving the reliability of the assembly and ensuring the reliability of the high-voltage explosion-proof motor in complex environments. It is suitable for more demanding industrial applications and can also reduce on-site assembly time. Attached Figure Description
[0017] Figure 1 This is a front view of the junction box body in Embodiment 1 of this application;
[0018] Figure 2 This is a top view of the junction box body in Embodiment 1 of this application;
[0019] Figure 3 This is a cross-sectional view of the junction box body after it has been glued in Embodiment 1 of this application;
[0020] Figure 4 This is a schematic diagram of the structure of the insulating plate with conductive welding pins in Embodiment 1 of this application;
[0021] Figure 5 This is a schematic diagram of the structure of the insulating plate in Embodiment 1 of this application;
[0022] Figure 6 This is a cross-sectional view of the junction box body after it has been sealed with adhesive in Embodiment 2 of this application;
[0023] Figure 7 This is a schematic diagram of the structure of the first and second cable sections after welding and then fitted with an insulating sleeve in Embodiment 2 of this application.
[0024] Label Explanation:
[0025] 1. Junction box body; 2. Sealing pool; 21. Wiring hole; 3. Outgoing cable; 31. First section of cable; 32. Second section of cable; 41. Insulating board; 411. Through hole; 42. Insulating sleeve; 5. Sealant; 6. Conductive connector; 61. Conductive welding needle; 7. Welding point. Detailed Implementation
[0026] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.
[0027] It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of this application. Therefore, the drawings only show the components related to this application and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.
[0028] The orientations or positional relationships indicated by terms such as "upper," "lower," "left," "right," "middle," "longitudinal," "lateral," "horizontal," "inner," "outer," "radial," and "circumferential" used in this specification are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the purpose of simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0029] Example 1
[0030] The following detailed description, in conjunction with the accompanying drawings, describes a pre-sealed junction box provided in this embodiment. Please refer to the attached drawings. Figures 1-5 As shown, the junction box includes a junction box body 1 and a lead-out cable 3. A protruding sealing pool 2 is fixed to the bottom of the junction box body 1. The lead-out cable 3 is divided into a first cable 31 and a second cable 32. The first end of the first cable 31 is located inside the junction box body 1, and the second end is located inside the sealing pool 2. The first end of the second cable 32 is located outside the junction box body 1, and the second end is located inside the sealing pool 2. The second ends of the first cable 31 and the second ends of the second cable 32 are respectively set as bare wires. The core wires of the two bare wires are respectively connected and the core wires are insulated from each other by an insulating part. The sealing pool 2 is sealed with sealant 5 to the second end of the first cable 31, the second end of the second cable 32, and the connection between the two.
[0031] In this embodiment, the reserved lead-out cable 3 is divided into two sections, namely the first section 31 and the second section 32. The second ends of both the first section 31 and the second section 32 are stripped of bare wire. The core wires of the two bare wires are connected correspondingly within the sealing pool 2, and the core wires are insulated from each other by an insulating part. Then, sealant 5 is applied to the sealing pool 2 to seal the second ends of the first section 31, the second section 32, and their connection points. On the one hand, pre-sealing one section of the lead-out cable 3 before connecting it to the temperature measuring wire or heater cable of the motor stator on-site effectively saves on-site assembly time. On the other hand, since the bare wires at the second ends of the first section 31 and the second section 32 have no electrical contact... Within the sealing pool 2, no leakage gaps can be formed between the bare wire cores and the cable sheath. Simultaneously, insulation is used to isolate the cores, preventing leakage gaps between them. Furthermore, the presence of sealant 5 isolates the path of water leakage. During the explosion-proof water pressure test on the junction box body 1, water leaking from the gaps between the cores of the first section of cable 31 and between the cores and the cable sheath cannot continue to leak into the gaps between the cores of the second section of cable 32 and between the cores and the cable sheath. This effectively prevents water leakage from the cable 3 during the water pressure test, ensuring the sealing performance of the junction box body 1 under water pressure conditions. This ensures the reliability of the high-voltage explosion-proof motor in complex environments and is suitable for more demanding industrial applications.
[0032] In this embodiment, it should be noted that the insulating part includes an insulating plate 41. The second end of the first cable segment 31 and the second end of the second cable segment 32 are respectively disposed on opposite sides of the insulating plate 41. Multiple conductive connectors 6 are fixedly connected to both sides of the insulating plate 41 along its thickness direction. One end of each conductive connector 6 is connected to each core wire of the second end of the first cable segment 31, and the other end of each conductive connector 6 is connected to each core wire of the second end of the second cable segment 32. Furthermore, the same conductive connector 6 connects core wires at the same position in both the first and second cable segments 31. Therefore, in this embodiment, by using multiple conductive connectors 6, the core wires of the first cable segment 31 and the second cable segment 32 on both sides of the insulating plate 41 can be electrically connected. Furthermore, by fixing multiple conductive connectors 6 to the same insulating plate 41, the position of the conductive connectors 6 can be fixed.
[0033] In some embodiments, the conductive connector 6 includes conductive welding pins 61. The conductive welding pins 61 penetrate the insulating plate 41 and are fixedly connected to the insulating plate 41. The insulating plate 41 is provided with through holes 411, and the conductive welding pins 61 pass through the through holes 411 and are fixed to the insulating plate 41. By using the conductive welding pins 61, the first section of cable 31 and the second section of cable 32 on both sides of the insulating plate 41 can be made conductive. When the core wires of the first section of cable 31 and the second section of cable 32 are multi-stranded, the number of conductive welding pins 61 is also set to multiple. The multiple conductive welding pins 61 are equidistantly distributed along the length direction of the insulating plate 41. Each conductive welding pin 61 is connected to the corresponding core wire in the first section of cable 31 and the second section of cable 32. By arranging the conductive welding pins 61 at intervals, short circuits between the first section of cable 31 and the second section of cable 32 with the bare wires stripped can be prevented and the continuity of the same cable can be ensured. Preferably, the number of through holes 411 and the number and position of conductive welding pins 61 are in a one-to-one correspondence.
[0034] In this embodiment, it should also be noted that a wire hole 21 is provided on the side of the sealing pool 2 away from the junction box body 1, through which the second section of cable 32 passes, and a sealing ring is used to seal the wire hole 21 and the second section of cable 32.
[0035] In some embodiments, sealant 5 is epoxy resin adhesive.
[0036] Example 2
[0037] The difference between Example 2 and Example 1 is as follows, please refer to... Figure 6 and Figure 7 As shown, the insulation part includes an insulating sleeve 42. Each core wire at the second end of the first section of cable 31 and each core wire at the second end of the second section of cable 32 are directly welded in the sealing pool 2. The welding position is the welding point 7.
[0038] When the core wires of the first cable segment 31 and the second cable segment 32 are single strands, there is one insulating sleeve 42. The insulating sleeve 42 is fitted on the outside of the core wires at the second end of the first cable segment 31 and the second cable segment 32, and both ends can extend to the outside of the cable sheaths of the first cable segment 31 and the second cable segment 32. A gap is left between the insulating sleeve 42 and the cable sheath, and the gap is filled with sealant 5 for sealing.
[0039] When the core wires of the first cable segment 31 and the second cable segment 32 are multi-stranded, the number of insulating sleeves 42 corresponds to the number of core wires. Each insulating sleeve 42 is respectively fitted onto the outside of each core wire at the second end of the first cable segment 31 and each core wire at the second end of the second cable segment 32. The same insulating sleeve 42 is fitted onto the outside of the core wires at the same position in the first cable segment 31 and the second cable segment 32, and a gap is left between the insulating sleeve 42 and the core wire. This gap is filled with sealant 5 for sealing. By fitting an insulating sleeve 42 onto the outside of each core wire, short circuits between core wires can be prevented. Thus, by maintaining a gap between the insulating sleeve 42 and the outside of the cable sheath or the outside of the core wire, it can be ensured that the sealant 5 can enter the insulating sleeve 42 during sealing, preventing water from entering from the insulating sleeve 42 and causing leakage during water pressure testing.
[0040] The implementation principle of this embodiment is as follows: The reserved lead-out cable 3 is divided into two sections, namely the first section 31 and the second section 32. The bare wires at the second ends of both the first section 31 and the second section 32 are stripped. Conductive welding pins 61 are threaded through and fixedly connected to the insulating plate 41. One end of the conductive welding pin 61 is connected to the second end of the first section 31, and the other end is connected to the second end of the second section 32, allowing the two cables to conduct electricity through the conductive welding pins 61. The insulating plate 41 is placed in the sealing pool 2 at the bottom of the junction box body 1, and the second section 32 at one end of the insulating plate 41... The wire hole 21 at the bottom of the sealing pool 2 extends out of the junction box body 1, and the wire hole 21 and the second section of cable 32 are sealed with a sealing ring; the first section of cable 31 at the other end of the insulating plate 41 remains in the junction box body 1 for connecting terminals, and then the insulating plate 41 and the second ends of the first section of cable 31 and the second section of cable 32 welded to the insulating plate 41 are poured with epoxy resin or other sealant that meets explosion-proof requirements. The second section of cable 32 extending from the bottom of the junction box body 1 is used to connect with the internal cable of the motor using closed terminal type terminals during assembly.
[0041] Since the bare wires are stripped from the second ends of both the first section of cable 31 and the second section of cable 32, and each core of the bare wire is connected within the sealant pool 2, no leakage gap can be formed between the core of the bare wire and the cable sheath within the sealant pool 2. Simultaneously, the cores are insulated from each other, preventing leakage gaps. Furthermore, the presence of sealant 5 ensures that during the explosion-proof water pressure test on the junction box body 1, water leaking from the gaps between the cores of the first section of cable 31 and between the core and the cable sheath cannot continue to leak into the gaps between the cores of the second section of cable 32 and between the core and the cable sheath. This effectively prevents water leakage from the cable 3 during the water pressure test, ensuring the sealing performance of the junction box body 1 under water pressure conditions.
[0042] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A terminal box for an explosion-proof electric machine, characterized by comprising: The utility model relates to an electrical junction box, comprising: a junction box body (1) with a convex surface glue seal pool (2) fixedly connected thereon; an outgoing cable (3) divided into a first cable segment (31) and a second cable segment (32); the first cable segment (31) has a first end located in the junction box body (1) and a second end located in the glue seal pool (2); the second cable segment (32) has a first end located outside the junction box body (1) and a second end located in the glue seal pool (2); the second ends of the first cable segment (31) and the second cable segment (32) are respectively provided as bare wires, and the cores of the two bare wires are respectively connected and insulated from each other by an insulation part; the second ends of the first cable segment (31) and the second cable segment (32) and the connection therebetween are glued and sealed by a sealing glue (5) in the glue seal pool (2).
2. The electrical junction box according to claim 1, wherein: the insulation part comprises an insulation plate (41), and the second ends of the first cable segment (31) and the second cable segment (32) are respectively arranged on opposite sides of the insulation plate (41); a plurality of conductive connectors (6) are arranged through opposite sides of the insulation plate (41), one end of each of the conductive connectors (6) is connected to each core of the second end of the first cable segment (31), and the other end of each of the conductive connectors (6) is connected to each core of the second end of the second cable segment (32); the same conductive connector (6) connects cores at the same position of the first cable segment (31) and the second cable segment (32).
3. The electrical junction box according to claim 2, wherein: the conductive connector (6) comprises a conductive welding pin (61), and the conductive welding pin (61) penetrates through the insulation plate (41) and is fixedly connected with the insulation plate (41).
4. The electrical junction box according to claim 3, wherein: a plurality of through holes (411) are arranged on the insulation plate (41), and the plurality of through holes (411) are equidistantly distributed along the length direction of the insulation plate (41); the conductive welding pin (61) and the through hole (411) are arranged one by one, the conductive welding pin (61) penetrates through the through hole (411) and is fixed with the insulation plate (41); each of the conductive welding pins (61) is connected to corresponding cores of the first cable segment (31) and the second cable segment (32).
5. The electrical junction box according to claim 1, wherein: the insulation part comprises an insulation sleeve (42); each core of the second end of the first cable segment (31) and each core of the second end of the second cable segment (32) is correspondingly welded in the glue seal pool (2). A plurality of the insulating sleeves (42) are provided, each of the insulating sleeves (42) being sleeved outside each core wire of the second end of the first cable (31) and each core wire of the second end of the second cable (32) respectively.
6. The junction box according to claim 5, characterized in that, A gap is provided between the inner circumferential wall of the insulating sleeve (42) and the core wire; The gap is filled with sealant (5).
7. The junction box according to claim 1 or 6, characterized in that, The sealant (5) is epoxy resin glue.
8. The junction box according to claim 1, characterized in that, A threading hole (21) is provided on the side of the glue sealing pool (2) away from the junction box body (1); The second cable (32) is threaded through the threading hole (21), and a sealing ring is used to seal between the threading hole (21) and the second cable (32).