A three-phase induction motor terminal box protection assembly

Abstract

The utility model relates to three -phase induction motor terminal box field especially relates to a kind of three -phase induction motor terminal box protection assembly. Including box body and auxiliary structure, the upper surface of the box body is provided with box cover, the box cover is connected with box body by means of auxiliary structure, the side of the box cover is equipped with auxiliary structure, the auxiliary structure includes limit block, the limit block is fixedly connected with box body, the inner wall of the limit block is rotatably connected with shaft, the arc surface of the shaft is fixedly connected with connecting block, the end of the connecting block away from the shaft is fixedly connected with box cover, the surface of the box cover is fixedly connected with two check rings, the check ring is attached with box body. The utility model provides a kind of three -phase induction motor terminal box protection assembly has not only can be conveniently connected to the quick closure opening of terminal box, it is convenient to carry out regular maintenance overhaul to terminal box, it is also convenient to carry out the advantage of waterproof inside terminal box.

Description

Technical Field

[0001] This utility model relates to the field of three-phase induction motor junction boxes, and in particular to a protective component for a three-phase induction motor junction box. Background Technology

[0002] The junction box for a phase induction motor is a key component external to the motor, used to connect the power cable to the internal wiring system. Its main functions are to protect the motor terminals, provide wiring space, and ensure the safety and reliability of electrical connections. The junction box is typically mounted on the motor housing to ensure cable entry and exit and provide necessary protection.

[0003] Existing technologies, such as the utility model patent with publication number CN208589855U, disclose a main junction box for multi-phase motors. This patent comprises a main junction box housing, multiple conductive rods and insulating support plates for the conductive rods disposed within the housing, and a cable outlet plate, drainage holes, grounding bolts, user lead-out cables, and winding lead-out cables disposed on the main junction box housing. The cable outlet plate and drainage holes are respectively disposed on the bottom plate of the main junction box housing; the grounding bolts are respectively disposed on the outer plates of the main junction box housing. This utility model, by using a conductive rod structure for the cable lead-out lines, successfully replaces the conventional three-phase induction motor main junction box. It offers advantages such as a large cavity, convenient and reliable wiring, large current carrying capacity, high protection level, and small size. Furthermore, the electrical clearance and creepage distance exceed national standard values, ensuring safety and reliability. It can be extended to twelve-phase and fifteen-phase induction motor main junction boxes, demonstrating strong versatility.

[0004] The inventors discovered in daily use that in existing technologies, when junction boxes are secured with bolts, maintenance personnel need to remove the bolts to open the junction box. This is extremely inconvenient when frequent inspections or wiring replacements are required, especially for large motors, where removing the bolts consumes significant time and labor. Although bolts secure the junction box, the sealing design is inadequate, and the seal around the bolts is not tight, allowing moisture, dust, or other contaminants to enter the junction box. Long-term exposure to a humid environment can lead to corrosion of electrical components, affecting the normal operation and lifespan of the motor. Furthermore, improper use of bolt-secured junction boxes, or issues such as loose bolts or aging sealing materials, can cause unstable sealing performance, further compromising waterproofing.

[0005] This application provides another technical solution to this technical problem, aiming to provide those skilled in the art with multiple options for solving the problem. Utility Model Content

[0006] The purpose of this invention is to address the shortcomings of existing technologies.

[0007] To solve the above-mentioned technical problems, this utility model provides a protective assembly for a three-phase induction motor junction box, comprising: a box body and an auxiliary structure. A box cover is provided on the upper surface of the box body, and the box cover is connected to the box body via the auxiliary structure. An auxiliary structure is provided on one side of the box cover. The auxiliary structure includes a limiting block, which is fixedly connected to the box body. A rotating shaft is rotatably connected to the inner wall of the limiting block. A connecting block is fixedly connected to the arc surface of the rotating shaft. The end of the connecting block away from the rotating shaft is fixedly connected to the box cover. Two retaining rings are fixedly connected to the surface of the box cover, and the retaining rings fit against the box body. The box body is located away from the limiting block. A fixed plate is fixedly connected to one side of the box, and an auxiliary rod is fixedly connected to the upper surface of the fixed plate. A connecting plate is rotatably connected to the arc surface of the auxiliary rod, and a slip ring is slidably connected to the arc surface of the auxiliary rod. A spring is sleeved on the arc surface of the auxiliary rod, and the two ends of the spring are fixedly connected to the slip ring and the fixed plate, respectively. Several insert rods are fixedly connected to the upper surface of the slip ring. Several insertion holes are opened on the inner wall of the connecting plate, and the insert rods are adapted to the insertion holes. A connecting plate is fixedly connected to the side of the box body and the box cover away from the limiting block. A clip frame is fixedly connected to the side of the connecting plate near the connecting plate, and the clip frame is engaged with the connecting plate.

[0008] The effect achieved by the above components is as follows: When the lid needs to be closed, the slip ring is pulled to move it. The slip ring slides on the arc surface of the auxiliary rod, and the slip ring drives the spring to contract. Then, the slip ring drives the insertion rod to separate from the insertion hole. Then, the connecting plate connected to the lid is pulled to move it. The lid drives the connecting block to move. The connecting block drives the rotating shaft to rotate on the inner wall of the limiting block. Then, the lid and the box body are closed. Then, the connecting plate is pulled to move it. The connecting plate drives the locking frame to move. The locking frame and the connecting plate are locked together. After moving to the appropriate position, the slip ring spring is released to stretch it. The spring drives the slip ring to reset. The slip ring drives the insertion rod to insert into the insertion hole for fixation.

[0009] Preferably, both ends of the rotating shaft are fitted with coil springs, and the two ends of the coil springs are fixedly connected to the limiting block and the connecting block, respectively.

[0010] The effect achieved by the above components is that when the lid is closed, the coil spring retracts, and the spring's rebound force can drive the lid to open.

[0011] Preferably, the arc surface of the auxiliary rod is fixedly connected to a plurality of positioning rods, and the positioning rods are slidably connected to the slip ring.

[0012] The effect achieved by the above components is that the positioning rod can limit the movement of the slip ring, preventing the slip ring from shifting during use.

[0013] Preferably, an anti-slip pad, which is a rubber pad, is fixedly connected to the inner wall of the card frame.

[0014] The effect achieved by the above components is that the anti-slip pad can increase the friction between the card frame and the connecting plate, preventing slippage when the card frame and the connecting plate are connected.

[0015] Preferably, the arc surface of the slip ring is provided with a plurality of slots, and the plurality of slots are evenly distributed on the slip ring.

[0016] The effect achieved by the above components is that the groove can increase the friction between the hand and the slip ring, preventing slippage when the slip ring is pulled.

[0017] Preferably, the cross-section of the retaining ring is U-shaped, and the retaining ring is a plastic ring.

[0018] The effect achieved by the above components is that the plastic material is relatively inexpensive, which can greatly reduce the manufacturing cost of the retaining ring.

[0019] Preferably, the auxiliary rod has a circular cross-section and is made of stainless steel.

[0020] The effect achieved by the above components is that the auxiliary rod can limit the spring, prevent the spring from deforming during use, and improve the service life of the spring.

[0021] Compared with related technologies, the three-phase induction motor junction box protection assembly provided by this utility model has the following beneficial effects:

[0022] By incorporating an auxiliary structure, this device addresses the issue that in existing technologies, when a junction box is secured with bolts, maintenance personnel must remove the bolts to open the box. This is extremely inconvenient when frequent inspections or wiring replacements are required, especially for large motors, where removing bolts consumes significant time and labor. While bolts secure the junction box, the sealing design is inadequate, and the seal around the bolts is not tight, allowing moisture, dust, or other contaminants to enter the junction box. Long-term exposure to a humid environment can lead to corrosion of electrical components, affecting the normal operation and lifespan of the motor. Improper use of bolt-secured junction boxes, or issues such as loose bolts or aging sealing materials, can cause unstable sealing performance, further compromising waterproofing. This device not only facilitates quick opening and closing of the junction box for convenient periodic maintenance and repair but also provides effective waterproofing of the junction box's interior. Attached Figure Description

[0023] Figure 1 A schematic diagram of the structure of a three-phase induction motor junction box protection assembly provided by this utility model;

[0024] Figure 2 for Figure 1 The diagram shows the structure of the auxiliary structure.

[0025] Figure 3 for Figure 1 A partial structural diagram of the auxiliary structure shown;

[0026] Figure 4 for Figure 3 The enlarged structural diagram at point A is shown.

[0027] The following are the labels in the diagram: 1. Box body; 2. Box lid; 3. Auxiliary structure; 301. Retaining ring; 302. Limiting block; 303. Connecting block; 304. Coil spring; 305. Rotating shaft; 306. Frame; 307. Connecting plate; 308. Anti-slip pad; 309. Fixing plate; 310. Connecting plate; 311. Insertion hole; 312. Insert rod; 313. Positioning rod; 314. Slip ring; 315. Groove; 316. Spring; 317. Auxiliary rod. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0029] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0030] Please see Figures 1 to 4 The present invention provides a protective assembly for a three-phase induction motor junction box, comprising: a box body 1 and an auxiliary structure 3. A box cover 2 is provided on the upper surface of the box body 1. The box cover 2 is connected to the box body 1 by means of the auxiliary structure 3. The auxiliary structure 3 is provided on one side of the box cover 2.

[0031] In the embodiments of this utility model, please refer to Figures 1 to 4The auxiliary structure 3 includes a limiting block 302, which is fixedly connected to the box body 1. A rotating shaft 305 is rotatably connected to the inner wall of the limiting block 302. A connecting block 303 is fixedly connected to the arc surface of the rotating shaft 305. One end of the connecting block 303 away from the rotating shaft 305 is fixedly connected to the box cover 2. Two retaining rings 301 are fixedly connected to the surface of the box cover 2, and the retaining rings 301 are in contact with the box body 1. A fixing plate 309 is fixedly connected to the side of the box body 1 away from the limiting block 302. An auxiliary rod 317 is fixedly connected to the upper surface of the fixing plate 309. A connecting plate 310 is rotatably connected to the arc surface of the auxiliary rod 317. A sliding ring 314 is slidably connected to the arc surface of the auxiliary rod 317. A spring 316 is sleeved on the arc surface of the auxiliary rod 317. The two ends of the spring 316 are fixedly connected to the sliding ring 314 and the fixing plate 309 respectively. Several insert rods 312 are fixedly connected to the upper surface of the sliding ring 314. Several insertion holes 311 are opened on the inner wall of the connecting plate 310. The insert rods 312 are adapted to the insertion holes 311. A connecting plate 307 is fixedly connected to the side of the box body 1 and the box cover 2 away from the limiting block 302. A clip frame 306 is fixedly connected to the side of the connecting plate 310 close to the connecting plate 307. The clip frame 306 is engaged with the connecting plate 307. When it is necessary to close the lid 2, the slip ring 314 is pulled to move it. The slip ring 314 slides on the arc surface of the auxiliary rod 317, causing the spring 316 to retract. Then, the slip ring 314 causes the insertion rod 312 to separate from the insertion hole 311. Then, the connecting plate 307 connected to the lid 2 is pulled to move it. The lid 2 causes the connecting block 303 to move. The connecting block 303 causes the rotating shaft 305 to rotate on the inner wall of the limiting block 302. Finally, the lid 2 and the box body 1 are closed. Then, the connecting plate 310 is pulled to move, which in turn moves the retaining frame 306. The retaining frame 306 engages with the connecting plate 307. After moving to the appropriate position, the slip ring 314 and spring 316 are released to stretch the spring. The spring 316 then moves the slip ring 314 back to its original position. The slip ring 314 then moves the insert rod 312 into the insertion hole 311 for fixation. Both ends of the rotating shaft 305 are fitted with coil springs 304, and both ends of the coil springs 304 are fixedly connected to the limiting block 302 and the connecting block 303, respectively. When the lid 2 is closed, the coil springs 304 retract, and the rebound force of the coil springs 304 can open the lid 2. Several positioning rods 313 are fixedly connected to the arc surface of the auxiliary rod 317, and the positioning rods 313 are slidably connected to the slip ring 314. The positioning rod 313 can limit the movement of the slip ring 314 to prevent it from shifting during use. An anti-slip pad 308, which is a rubber pad, is fixedly connected to the inner wall of the frame 306. The anti-slip pad 308 increases the friction between the frame 306 and the connecting plate 307, preventing slippage when they are connected. The arc surface of the slip ring 314 has several slots 315 evenly distributed on it.The groove 315 increases the friction between the hand and the slip ring 314, preventing slippage when pulling the slip ring 314. The retaining ring 301 has a U-shaped cross-section and is made of plastic. Plastic is a relatively inexpensive material, significantly reducing the manufacturing cost of the retaining ring 301. The auxiliary rod 317 has a circular cross-section and is made of stainless steel. The auxiliary rod 317 limits the movement of the spring 316, preventing deformation during use and extending its service life.

[0032] The working principle of the three-phase induction motor junction box protection assembly provided by this utility model is as follows: When the box cover 2 needs to be closed, the slip ring 314 is pulled to move. The slip ring 314 slides on the arc surface of the auxiliary rod 317. The slip ring 314 drives the spring 316 to retract. Then, the slip ring 314 drives the insertion rod 312 to separate from the insertion hole 311. Then, the connecting plate 307 connected to the box cover 2 is pulled to move. The box cover 2 drives the connecting block 303 to move. The connecting block 303 drives the rotating shaft 305 to rotate on the inner wall of the limiting block 302. Then, the box cover 2 and the box body 1 are closed. Then, the connecting plate 310 is pulled to move. The connecting plate 310 drives the locking frame 306 to move. The locking frame 306 engages with the connecting plate 307. After moving to the appropriate position, the slip ring 314 is released and the spring 316 is stretched. The spring 316 drives the slip ring 314 to retract. Ring 314 resets, and slip ring 314 drives insertion rod 312 to be inserted into insertion hole 311 for fixation. When the cover 2 is closed, coil spring 304 retracts, and the rebound force of coil spring 304 can drive cover 2 to open. Positioning rod 313 can limit slip ring 314 to prevent slip ring 314 from shifting during use. Anti-slip pad 308 can increase the friction between the frame 306 and the connecting plate 307 to prevent slippage when the frame 306 and the connecting plate 307 are connected. Groove 315 can increase the friction between hand and slip ring 314 to prevent slippage when the slip ring 314 is pulled. Plastic material is relatively inexpensive, which can greatly reduce the manufacturing cost of retaining ring 301. Auxiliary rod 317 can limit spring 316 to prevent spring 316 from deforming during use and improve the service life of spring 316.

[0033] The circuits and controls involved in this utility model are all existing technologies, and will not be described in detail here.

[0034] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A protective assembly for a three-phase induction motor junction box, characterized in that, include: The box body (1) and the auxiliary structure (3) are provided. The upper surface of the box body (1) is provided with a lid (2). The lid (2) is connected to the box body (1) by means of the auxiliary structure (3). The auxiliary structure (3) is provided on one side of the lid (2). The auxiliary structure (3) includes a limiting block (302). The limiting block (302) is fixedly connected to the box body (1). The inner wall of the limiting block (302) is rotatably connected to a rotating shaft (305). A connecting block (303) is fixedly connected to the arc surface of the shaft (305). The end of the connecting block (303) away from the shaft (305) is fixedly connected to the cover (2). Two retaining rings (301) are fixedly connected to the surface of the cover (2). The retaining rings (301) are in contact with the box body (1). A fixing plate (309) is fixedly connected to the side of the box body (1) away from the limiting block (302). The upper surface of the fixing plate (309) is fixed. An auxiliary rod (317) is connected, and a connecting plate (310) is rotatably connected to the arc surface of the auxiliary rod (317). A slip ring (314) is slidably connected to the arc surface of the auxiliary rod (317). A spring (316) is fitted onto the arc surface of the auxiliary rod (317). The two ends of the spring (316) are fixedly connected to the slip ring (314) and the fixing plate (309) respectively. Several insert rods are fixedly connected to the upper surface of the slip ring (314). 312), the inner wall of the connecting plate (310) is provided with a plurality of insertion holes (311), the insertion rod (312) is adapted to the insertion holes (311), the box body (1) and the box cover (2) are fixedly connected to the side away from the limiting block (302) with a connecting plate (307), the side of the connecting plate (310) close to the connecting plate (307) is fixedly connected with a card frame (306), and the card frame (306) is engaged with the connecting plate (307).

2. The three-phase induction motor junction box protection assembly according to claim 1, characterized in that, Both ends of the rotating shaft (305) are fitted with coil springs (304), and the two ends of the coil springs (304) are fixedly connected to the limiting block (302) and the connecting block (303) respectively.

3. The three-phase induction motor junction box protection assembly according to claim 1, characterized in that, The auxiliary rod (317) has several positioning rods (313) fixedly connected to its arc surface, and the positioning rods (313) are slidably connected to the slip ring (314).

4. A protective assembly for a three-phase induction motor junction box according to claim 1, characterized in that, The inner wall of the card frame (306) is fixedly connected with an anti-slip pad (308), which is a rubber pad.

5. A protective assembly for a three-phase induction motor junction box according to claim 1, characterized in that, The slip ring (314) has a plurality of slots (315) on its arc surface, and the plurality of slots (315) are evenly distributed on the slip ring (314).

6. A protective assembly for a three-phase induction motor junction box according to claim 1, characterized in that, The cross-section of the retaining ring (301) is U-shaped, and the retaining ring (301) is a plastic ring.

7. A protective assembly for a three-phase induction motor junction box according to claim 1, characterized in that, The auxiliary rod (317) has a circular cross-section and is made of stainless steel.

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