Explosion-proof motor terminal box

Abstract

The utility model relates to an explosion -proof motor junction box, including machine box cover and box body, the inside of box body has the line cavity, one side of box body is equipped with the wire inlet pipe, the line cavity is installed with earthing terminal and multiple binding posts close to wire inlet pipe department, the cable sealing joint is installed in wire inlet pipe, the inside of cable sealing joint is equipped with conical pre -tightening piece, bellows seal ring and anti -loose fixed ring to line cavity direction's axial place in proper order, bellows seal ring is multilayer bellows structure, produces multiple sealing surface after being pressed by cable, can through elastic deformation adaptation different diameter cable through the utility model, the clamping structure of annular fixed block and card groove, and the conical pre -tightening piece in sealing joint inside, can adjust pre -tightening force according to cable diameter, ensure that different specifications cable can realize good sealing and fixed effect, need not to make to line junction box of different size, has reduced the purchase cost and use complexity.

Description

Technical Field

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

[0002] In production environments such as petroleum, chemical, and coal mining industries, large quantities of flammable and explosive gases or dust are present. Explosion-proof motors, as key power sources driving equipment in these environments, are of paramount importance for their safety. Junction boxes, as one of the core components of explosion-proof motors, bear the crucial responsibility of connecting the motor windings to external power supplies and control circuits, while also effectively preventing internal electrical sparks or high temperatures from igniting an explosion in the external hazardous environment.

[0003] However, there are many problems with explosion-proof motor junction boxes currently on the market. From a sealing performance perspective, some junction boxes have flawed sealing structure designs at the cable inlet. Common sealing methods rely solely on simple rubber rings. After prolonged use, especially under harsh conditions of frequent vibration and large temperature and humidity changes, these rubber rings are prone to aging and deformation, leading to seal failure. This allows flammable and explosive substances from the outside to enter the junction box, greatly increasing the risk of explosion.

[0004] Furthermore, traditional junction boxes are clearly insufficient in their adaptability when dealing with cables of different specifications. Due to their fixed inlet size or inflexible sealing structure, they either cannot be installed on cables with thicker or thinner diameters, or they cannot achieve a good sealing and securing effect. In practical engineering applications, to accommodate different cable specifications, it is often necessary to customize junction boxes of different sizes, which undoubtedly increases procurement costs, inventory management difficulties, and the complexity of use. Utility Model Content

[0005] This utility model addresses the shortcomings of existing technologies by providing an explosion-proof motor junction box, the specific technical solution of which is as follows:

[0006] An explosion-proof motor junction box includes a cover and a body. The body has a wire cavity inside, and an inlet pipe is provided on the side of the body. A grounding terminal and multiple terminals are installed in the wire cavity near the inlet pipe. A cable sealing joint is installed inside the inlet pipe. Inside the cable sealing joint, a tapered pre-tightening block, a corrugated sealing ring, and an anti-loosening fixing ring are sequentially arranged axially towards the wire cavity. The corrugated sealing ring has a multi-layer corrugated structure, which generates multiple sealing surfaces after being compressed by the cable.

[0007] Preferably, the inner side of the anti-loosening fixing ring has multiple anti-slip teeth to prevent axial movement of the cable.

[0008] Preferably, the outer side of the cable sealing joint has an annular fixing block, the outer side of the inlet pipe is provided with a slot, and the side of the annular fixing block near the box body has an annular locking block that matches the slot.

[0009] Preferably, the top of the box body is provided with a U-shaped slot, the U-shaped slot is provided with a sealing ring layer inside, and the bottom of the box cover has a U-shaped protrusion that matches the U-shaped slot.

[0010] Preferably, the four corners of the housing cover are provided with first threaded mounting holes, and the four corners of the housing are provided with second threaded mounting holes that are adapted to the first threaded mounting holes. When the U-shaped protrusion is inserted into the U-shaped slot, it can be threadedly connected between the first threaded mounting hole and the second threaded mounting hole by a fixing bolt.

[0011] Preferably, the cable sealing joint is made of elastic rubber material.

[0012] The beneficial effects of this utility model are:

[0013] 1. The multi-layered corrugated structure of the corrugated sealing ring deforms under pressure when the cable passes through, forming multiple sealing surfaces, effectively preventing flammable and explosive substances from entering the junction box; the combination of the U-shaped slot and the U-shaped protrusion, along with the sealing ring layer, further enhances the sealing performance between the cover and the body of the junction box, and the double sealing design greatly reduces the risk of explosion.

[0014] 2. The cable sealing joint made of elastic rubber material can adapt to cables of different diameters through elastic deformation; the snap-fit ​​structure of the annular fixing block and the slot, as well as the conical pre-tightening block inside the sealing joint, can adjust the pre-tightening force according to the cable diameter, ensuring that cables of different specifications can achieve good sealing and fixing effects, eliminating the need to customize junction boxes of different sizes, reducing procurement costs and usage complexity.

[0015] 3. The anti-slip teeth on the inner side of the anti-loosening fixing ring tightly engage with the cable surface to prevent axial movement of the cable under vibration and other operating conditions, ensuring the stability of the electrical connection; the snap-fit ​​and threaded connections between various components make the structure of the entire explosion-proof motor junction box more robust, improving the reliability and service life of the equipment. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the box body in this utility model;

[0018] Figure 3 This is a schematic diagram of the cable sealing joint in this utility model.

[0019] Reference numerals: 1. Chassis cover; 10. First threaded mounting hole; 2. Chassis body; 20. Second threaded mounting hole; 200. Cable cavity; 21. U-shaped slot; 22. Terminal block; 23. Grounding terminal; 24. Cable inlet pipe; 241. Slot; 25. Cable sealing connector; 250. Annular fixing block; 251. Conical pre-tightening block; 252. Corrugated sealing ring; 253. Anti-loosening fixing ring; 254. Anti-slip teeth. Detailed Implementation

[0020] 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.

[0021] Example

[0022] For explosion-proof motor junction boxes, please refer to... Figures 1-3 The explosion-proof motor junction box includes a cover 1 and a body 2. The body 2 has a wire cavity 200 inside. A wire inlet pipe 24 is provided on the side of the body 2. A grounding terminal 23 and multiple terminals 22 are installed in the wire cavity 200 near the wire inlet pipe 24. A cable sealing connector 25 is installed inside the wire inlet pipe 24.

[0023] Inside the cable sealing joint 25, along the axial direction towards the cable cavity 200, there are sequentially arranged a tapered pre-tightening block 251, a corrugated sealing ring 252, and an anti-loosening fixing ring 253. Among them, the corrugated sealing ring 252 has a multi-layer corrugated structure, which can generate multiple sealing surfaces after being compressed by the cable, significantly improving the sealing effect.

[0024] The inner side of the anti-loosening retaining ring 253 has multiple anti-slip teeth, which can effectively prevent the axial movement of the cable and ensure the stability of the cable connection.

[0025] The outer side of the cable sealing joint 25 has an annular fixing block 250, and the outer side of the inlet pipe 24 has a slot 241. The annular fixing block 250 has an annular locking block that matches the slot 241 on the side near the box 2. The sealing joint and the inlet pipe 24 are quickly installed and fixed by snap-fit, while enhancing the sealing performance.

[0026] The top of the housing 2 is provided with a U-shaped slot 21, and a sealing ring is provided inside the U-shaped slot 21. The bottom of the housing cover 1 has a U-shaped protrusion that matches the U-shaped slot 21. Each of the four corners of the housing cover 1 is provided with a first threaded mounting hole 10, and each of the four corners of the housing 2 is provided with a second threaded mounting hole 20 that matches the first threaded mounting hole 10. When the U-shaped protrusion is inserted into the U-shaped slot 21, it can be threadedly connected between the first threaded mounting hole 10 and the second threaded mounting hole 20 by a fixing bolt, forming a tight sealing connection.

[0027] The cable sealing joint 25 is made of elastic rubber material, which utilizes the elastic deformation capability of the material to better adapt to cables of different diameters, thereby improving the versatility and sealing effect of the sealing joint.

[0028] The specific structure of the explosion-proof motor junction box is as follows: Figure 1-3 As shown, the box 2 has an internal cavity 200 for accommodating the terminal block 22 and the grounding terminal 23, enabling the electrical connection between the cable and the motor windings. The cable inlet pipe 24 on the side of the box 2 is used for cable insertion, and a cable sealing connector 25 is installed inside the inlet pipe 24.

[0029] The installation process of the cable sealing joint 25 is as follows: The cable is inserted through the inlet pipe 24, passing sequentially through the anti-loosening retaining ring 253, the corrugated sealing ring 252, and the conical pre-tightening block 251. Since the cable sealing joint 25 is made of elastic rubber, when the cable passes through, the conical pre-tightening block 251 exerts a squeezing effect on the corrugated sealing ring 252, causing the multi-layered corrugated structure of the corrugated sealing ring 252 to fit tightly against the cable surface, forming multiple sealing surfaces and achieving a good sealing effect. Simultaneously, the anti-slip teeth 254 on the inner side of the anti-loosening retaining ring 253 tightly grip the cable surface, preventing axial movement of the cable.

[0030] The annular fixing block 250 on the outside of the cable sealing joint 25 is adapted to the slot 241 on the outside of the inlet pipe 24. By engaging the annular block with the slot 241, the sealing joint 25 is fixed inside the inlet pipe 24, ensuring the stability of the sealing joint 25 and further enhancing the sealing performance.

[0031] The junction box 2 has a sealing ring inside the U-shaped slot 21 at the top. The U-shaped protrusion at the bottom of the junction box cover 1 is inserted into the U-shaped slot 21, and the sealing ring achieves a preliminary seal. Then, fixing bolts are used to pass through the first threaded mounting holes 10 at the four corners of the junction box cover 1 and the second threaded mounting holes 20 at the four corners of the junction box 2 to firmly connect the junction box cover 1 and the junction box 2, forming a tight sealing structure that effectively prevents flammable and explosive substances from entering the junction box.

[0032] Working principle:

[0033] When the explosion-proof motor junction box is in operation, the cable passes through the inlet pipe 24 into the cable cavity 200, completing the electrical connection with the terminal block 22 and the grounding terminal 23. The corrugated sealing ring 252 inside the cable sealing joint 25, under the pressure of the conical pre-tightening block 251, forms multiple sealing surfaces with the cable surface, preventing external gas or dust from entering the junction box through the inlet. The anti-slip teeth 254 of the anti-loosening fixing ring 253 prevent axial movement of the cable under vibration or other conditions, ensuring the stability of the electrical connection.

[0034] The cover 1 and the body 2 are connected by a loop-shaped slot 21 and a loop-shaped protrusion, and are fixed by a sealing ring and bolts to form a sealed cavity, which effectively isolates the internal electric sparks or high temperature from the external dangerous environment, ensuring that the explosion-proof motor junction box can operate safely and reliably in flammable and explosive environments.

[0035] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An explosion-proof motor junction box, characterized in that, The device includes a cover (1) and a body (2). The body (2) has a wire cavity (200) inside. A wire inlet pipe (24) is provided on the side of the body (2). A grounding terminal (23) and multiple terminals (22) are installed in the wire cavity (200) near the wire inlet pipe (24). A cable sealing joint (25) is installed inside the wire inlet pipe (24). A conical pre-tightening block (251), a corrugated sealing ring (252) and an anti-loosening fixing ring (253) are sequentially provided in the axial direction of the cable sealing joint (25) towards the wire cavity (200). The corrugated sealing ring (252) has a multi-layer corrugated structure, which generates multiple sealing surfaces after being compressed by the cable.

2. The explosion-proof motor junction box according to claim 1, characterized in that: The inner side of the anti-loosening fixing ring (253) has multiple anti-slip teeth (254) to prevent the cable from moving axially.

3. The explosion-proof motor junction box according to claim 1, characterized in that: The cable sealing joint (25) has an annular fixing block (250) on its outer side, and the inlet pipe (24) has a slot (241) on its outer side. The annular fixing block (250) has an annular locking block that matches the slot (241) on the side of the box (2) near the box body (2).

4. The explosion-proof motor junction box according to claim 1, characterized in that: The top of the box body (2) is provided with a spiral slot (21), and the spiral slot (21) is provided with a sealing ring layer inside. The bottom of the box cover (1) has a spiral protrusion that matches the spiral slot (21).

5. The explosion-proof motor junction box according to claim 4, characterized in that: The four corners of the casing cover (1) are provided with first threaded mounting holes (10), and the four corners of the casing (2) are provided with second threaded mounting holes (20) that are adapted to the first threaded mounting holes (10). When the U-shaped protrusion is inserted into the U-shaped slot (21), it can be threadedly connected between the first threaded mounting hole (10) and the second threaded mounting hole (20) by a fixing bolt.

6. The explosion-proof motor junction box according to claim 1, characterized in that: The cable sealing joint (25) is made of elastic rubber material.

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