Explosion-proof junction box and explosion-proof motor

Abstract

The utility model discloses an explosion-proof junction box and an explosion-proof motor, and the junction box comprises a box body which is internally provided with a wiring cavity, and the box body is provided with an avoiding opening which is communicated with the wiring cavity and the outside; the auxiliary plate covers the avoiding opening in a sealing mode, at least one first mounting hole is formed in the auxiliary plate, and the two ends of the first mounting hole communicate with the avoiding opening and the outside correspondingly; the first binding posts are in one-to-one correspondence with the first mounting holes, one ends of the first binding posts penetrate through the first mounting holes, and the other ends of the first binding posts are located outside; wherein the first binding post is in welding fit with the first mounting hole, and the auxiliary plate is in welding fit with the box body. By adopting the structure, the explosion-proof performance of the junction box can be ensured, and the volume of the junction box can be effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to an explosion-proof junction box and an explosion-proof motor. Background Art

[0002] Explosion-proof motors mainly work in an environment with flammable and explosive gases or dust, in order to prevent the flammable gas and / or dust outside the motor from entering the inside of the motor to the greatest extent possible, and will not lead the flame out of the casing to ignite the surrounding flammable gas and / or dust. Explosion-proof motors not only need to have reliable explosion-proof safety performance, but the accessories or attachments they use, such as the junction box for wiring, also need to have explosion-proof safety performance. The junction box usually includes a box body and a terminal. The terminal is passed through the box body, one end of which is located inside the box body and the other end is located outside the box body, so as to electrically connect the external power supply and the cables inside the box body. In order to ensure the explosion-proof performance of the junction box, the terminal usually adopts an explosion-proof terminal structure to form a reliable explosion-proof joint surface between it and the box body. However, the explosion-proof terminal is generally large in size, resulting in a large overall size of the junction box, which is not conducive to the development of motors towards miniaturization.

[0003] Therefore, it is necessary to improve the prior art to overcome the above defects. Utility Model Content

[0004] The purpose of the utility model is to provide an explosion-proof junction box and an explosion-proof motor, which can ensure the explosion-proof performance and effectively reduce the volume of the junction box.

[0005] The purpose of this utility model is to achieve the following technical solutions: an explosion-proof junction box, comprising:

[0006] The box body has a wiring cavity formed therein, and the box body is provided with an escape opening communicating with the wiring cavity and the outside;

[0007] An auxiliary plate, covering the outside of the avoidance opening, the auxiliary plate is provided with at least one first mounting hole, and two ends of the first mounting hole are respectively connected to the avoidance opening and the outside;

[0008] a first terminal, corresponding one-to-one to the first mounting hole, one end of the first terminal passing through the first mounting hole and the other end located outside;

[0009] The first terminal is welded to the first mounting hole, and the auxiliary plate is welded to the box body.

[0010] Furthermore, the first terminal includes:

[0011] a jacket, comprising a first end and a second end opposite to the first end, wherein a connecting hole is formed through the jacket in a direction from the first end to the second end;

[0012] a terminal body, mounted in the connection hole from the first end;

[0013] a welding portion connected to the second end, the welding portion being provided with a receiving hole communicating with the first mounting hole and the connecting hole;

[0014] The welding portion is adapted to penetrate the first mounting hole and drive the second end to abut against the outer end of the first mounting hole, and the welding portion is welded to the inner wall of the first mounting hole.

[0015] Furthermore, the outer sleeve and the welding portion are both cylindrical structures and coaxial, the outer diameter of the outer sleeve is larger than the inner diameter of the first mounting hole, and the outer diameter of the welding portion is not larger than the inner diameter of the first mounting hole.

[0016] Furthermore, the first mounting hole, the connecting hole and the receiving hole are coaxial.

[0017] Furthermore, there are multiple first binding posts, which are arranged side by side on the auxiliary board.

[0018] Furthermore, the outer wall of the box body is provided with a positioning portion for positioning the auxiliary plate, the positioning portion is arranged outside the avoidance opening, and the auxiliary plate is welded to the positioning portion.

[0019] Furthermore, the explosion-proof junction box further includes:

[0020] a partition, disposed in the wiring cavity and adapted to separate the wiring cavity into a first cavity portion and a second cavity portion that are independent of each other;

[0021] at least one second terminal fixedly disposed through the partition, with two ends of the second terminal respectively located in the first cavity and the second cavity;

[0022] The avoidance opening is in communication with the second cavity, and the box body is provided with a wiring opening in communication with the first cavity and the outside.

[0023] Furthermore, the wiring opening and the avoidance opening are arranged opposite to each other, and the opening directions of the wiring opening and the avoidance opening are both parallel to the plate surface of the partition.

[0024] Furthermore, both sides of the box body in a direction perpendicular to the partition plate surface are open sides, and the explosion-proof junction box includes connecting plates corresponding to the open sides one by one, and the connecting plates are detachably sealed on the open sides.

[0025] In addition, the utility model also provides an explosion-proof motor, including the aforementioned explosion-proof junction box.

[0026] Compared with the prior art, the present invention has the following beneficial effects: the present invention adopts the above-mentioned structure, and the first terminal and the box body are welded together, so that the first terminal does not need to adopt an explosion-proof terminal structure, effectively reducing the volume of the first terminal, thereby reducing the overall volume of the terminal box, and facilitating the development trend of miniaturization of the motor; by setting an auxiliary plate, the auxiliary plate is provided with a first mounting hole corresponding to the first terminal, and one end of the first terminal is passed through the first mounting hole, and the first terminal can be first welded to the inner wall of the first mounting hole, and then the auxiliary plate is welded to the box body. Compared with directly welding the first terminal to the outer wall of the box body, when there are several first terminals, several first terminals can be close to each other, further reducing the volume of the terminal box, and the first terminals are easy to weld and are not easily interfered with by adjacent first terminals; in addition, the first terminals can be guided by the inner edge of the first mounting hole during welding, which makes welding convenient and more firm and reliable after welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the exploded structure of the utility model explosion-proof junction box.

[0028] Figure 2 It is a cross-sectional schematic diagram of the utility model explosion-proof junction box.

[0029] Figure 3 It is a cross-sectional schematic diagram of the explosion-proof junction box of the utility model when the second terminal is not provided.

[0030] Description of reference numerals:

[0031] 100. Box body; 110. Wiring cavity; 120. Wiring opening; 130. Avoidance opening; 140. Positioning portion; 141. Connecting end face; 150. First cavity portion; 160. Second cavity portion; 170. Flange portion; 200. First terminal; 210. Jacket; 211. First end; 212. Second end; 213. Connecting hole; 220. Terminal body; 230. Welding portion; 231. Receiving hole; 300. Auxiliary plate; 310. First mounting hole; 400. Partition; 410. Second mounting hole; 500. Second terminal; 600. Connecting plate. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. It will be understood that the specific embodiments described herein are only used to explain the present application, rather than to limit the present application. It should also be noted that, for ease of description, only some, rather than all, structures related to the present application are shown in the accompanying drawings. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0033] As used herein, the terms "comprise," "comprising," and "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or elements is not limited to the listed steps or elements but may optionally include steps or elements not listed, or may optionally include other steps or elements inherent to the process, method, product, or apparatus.

[0034] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0035] See also Figures 1 to 3 As shown, an explosion-proof junction box corresponding to a preferred embodiment of the present invention is used to be installed on a motor to connect with the cables inside the motor (not shown). The explosion-proof junction box includes a box body 100, a wiring cavity 110 is formed in the box body 100, and the box body 100 is provided with a wiring opening 120 connecting the wiring cavity 110 and the outside. The motor casing is connected to the wiring opening 120 to introduce the cables inside the motor from the wiring opening 120 into the box body 100. The explosion-proof junction box includes a first terminal 200 provided on the box body 100, one end of the first terminal 200 extends into the wiring cavity 110, and the other end is located outside the box body 100, so that the cables located in the box body 100 can be connected to the external power supply through the first terminal 200.

[0036] Furthermore, the box body 100 defines a bypass opening 130 connecting the wiring cavity 110 with the outside. The explosion-proof junction box includes an auxiliary plate 300 that covers the bypass opening 130. The auxiliary plate 300 defines at least one first mounting hole 310. The first mounting hole 310 extends perpendicularly to the surface of the auxiliary plate 300, with both ends of the first mounting hole 310 communicating with the bypass opening 130 and the outside, respectively. A first terminal 200 corresponds one-to-one with the first mounting hole 310, with one end of the first terminal 200 extending through the first mounting hole 310 and the other end located externally. The first terminal 200 is welded to the first mounting hole 310, and the auxiliary plate 300 is welded to the box body 100.

[0037] The utility model adopts the above structure, and the first terminal 200 and the box body 100 are welded together, so that the first terminal 200 does not need to adopt an explosion-proof terminal structure, which effectively reduces the volume of the first terminal 200, thereby reducing the overall volume of the terminal box, which is convenient for the development trend of motor miniaturization; by providing an auxiliary plate 300, the auxiliary plate 300 is provided with a first mounting hole 310 corresponding to the first terminal 200, one end of the first terminal 200 is passed through the first mounting hole 310, and the first terminal 200 can be connected to the first mounting hole 310 first. The inner wall of the box body 100 is welded together, and then the auxiliary plate 300 is welded to the box body 100. Compared with directly welding the first terminal 200 to the outer wall of the box body 100, when there are several first terminals 200, several first terminals 200 can be close to each other, further reducing the volume of the terminal box. At the same time, the first terminals 200 are easy to weld and are not easily interfered with by adjacent first terminals 200. In addition, the first terminals 200 can be guided by the inner edge of the first mounting hole 310 during the welding process, which is convenient for welding and more firm and reliable after welding.

[0038] Furthermore, there are multiple first terminals 200, which are arranged side by side in close proximity on the auxiliary board 300. The first terminal 200 includes a jacket 210 and a terminal body 220 mounted within the jacket 210. The jacket 210 can be made of an insulating material, and a cable is connected to the terminal body 220. The jacket 210 includes a first end 211 and a second end 212 opposite the first end 211. A connecting hole 213 is formed through the jacket 210 in the direction from the first end 211 to the second end 212. The terminal body 220 is mounted in the connecting hole 213 from the first end 211. In one embodiment, the connecting hole 213 can be a threaded hole, and the terminal body 220 is provided with external threads for threaded connection with the connecting hole 213. This facilitates connection between the terminal body 220 and the jacket 210, and facilitates adjustment of their relative axial position. Of course, in other embodiments, an interference fit or other connection structure can be used to achieve the connection between the two, and the present invention is not limited thereto.

[0039] In one embodiment, the outer contour of the outer sleeve 210 is adapted to the inner contour of the first mounting hole 310, and the second end 212 of the outer sleeve 210 is inserted into the first mounting hole 310 and welded to the inner edge of the first mounting hole 310. However, with the above structure, since the outer sleeve 210 inserted into the first mounting hole 310 is axially movable, the axial positioning accuracy is poor. Preferably, a flange (not shown) is provided around the inner wall of the first mounting hole 310, and the second end 212 of the outer sleeve 210 can abut against the flange to axially position the outer sleeve 210. However, with the above structure, the processing technology of the first mounting hole 310 is cumbersome, which is not conducive to the efficient production of the auxiliary plate 300.

[0040] Preferably, the second end 212 of the outer sleeve 210 is connected to a welding portion 230. The outer contour of the welding portion 230 matches the inner contour of the first mounting hole 310. The welding portion 230 is inserted into the first mounting hole 310, and the second end 212 is forced to abut against the outer end of the first mounting hole 310. The welding portion 230 is then welded to the inner wall of the first mounting hole 310. This structure eliminates the need to form a flange within the first mounting hole 310, thereby improving production efficiency.

[0041] The welding portion 230 can be integrally formed with the outer sleeve 210, or formed separately and then assembled together. In this embodiment, it is preferably integrally formed to reduce assembly steps. The welding portion 230 defines a receiving hole 231 that connects the first mounting hole 310 and the connecting hole 213. The cable enters the connecting hole 213 through the first mounting hole 310 and the receiving hole 231 to connect to the terminal body 220. Preferably, the first mounting hole 310, the connecting hole 213, and the receiving hole 231 are coaxial to reduce cable bending and facilitate cable routing.

[0042] In this embodiment, the outer sleeve 210 and the welding portion 230 are both cylindrical structures and coaxial. The outer diameter of the outer sleeve 210 is larger than the inner diameter of the first mounting hole 310, ensuring that the second end 212 can reliably abut and cover the outer end of the first mounting hole 310. The outer diameter of the welding portion 230 is no larger than the inner diameter of the first mounting hole 310, allowing the welding portion 230 to smoothly pass through the first mounting hole 310. The welding portion 230 and the first mounting hole 310 preferably have a clearance fit, which improves the reliability of the welding portion 230 after welding. In addition, when the outer sleeve 210 is axially restrained in the auxiliary plate 300, the end of the welding portion 230 not connected to the second end 212 is recessed inward relative to the inner end of the first mounting hole 310, ensuring that the welding portion 230 can be welded to the inner edge of the first mounting hole 310.

[0043] Furthermore, the outer wall of the box body 100 is provided with a positioning portion 140. The positioning portion 140 is arranged outside the avoidance opening 130 and is suitable for positioning the auxiliary plate 300. The auxiliary plate 300 is welded to the positioning portion 140. The positioning portion 140 facilitates the positioning of the auxiliary plate 300, ensuring the consistency of the position of the auxiliary plate 300 while allowing the auxiliary plate 300 to reliably cover the outside of the avoidance opening 130.

[0044] The positioning portion 140 is specifically a protrusion arranged outside the avoidance opening 130, and is preferably integrally formed with the box body 100 to simplify the assembly process. The positioning portion 140 is distributed continuously or intermittently along the circumference of the avoidance opening 130, and the welding structure can weld the peripheral side of the auxiliary plate 300 to the positioning portion 140. In one embodiment, the positioning portion 140 is surrounded by a positioning space, and the auxiliary plate 300 can be accommodated in the positioning space so as to be blocked by the positioning portion 140 in a direction parallel to its plate surface to achieve positioning. The plate surface of the auxiliary plate 300 specifically refers to a surface perpendicular to the axial direction of the first mounting hole 310, and the peripheral side of the auxiliary plate 300 specifically refers to the part composed of other surfaces except the plate surface.

[0045] In this embodiment, the positioning portion 140 has a connecting end surface 141, which faces away from the outer wall of the box body 100 on which the positioning portion 140 is provided. The surface of the auxiliary plate 300 is in contact with the connecting end surface 141. The circumferential profile of the connecting end surface 141 is identical to the circumferential profile of the auxiliary plate 300, and the dimensions are also identical or substantially identical. When the auxiliary plate 300 is positioned on the connecting end surface 141, the projections of the two in a direction perpendicular to the surface of the auxiliary plate 300 coincide or substantially coincide. In other words, the connecting end surface 141 can serve as a reference surface, allowing the auxiliary plate 300 to be adjusted in position based on the reference surface to ensure that each side of the auxiliary plate 300 is flush or substantially flush, thereby achieving the positioning of the auxiliary plate 300.

[0046] Furthermore, the explosion-proof junction box also includes a partition 400 and a second terminal 500. The partition 400 is disposed within the wiring cavity 110 and is adapted to separate the wiring cavity 110 into a first cavity 150 and a second cavity 160, each of which is independent of the other. The partition 400 can be integrally formed with the box body 100 or separately formed and then assembled together. In this embodiment, it is preferably integrally formed to simplify the assembly process. The partition 400 has a second mounting hole 410 extending perpendicularly therethrough. The second terminal 500 can employ a conventional terminal structure and is fixedly inserted into the second mounting hole 410 of the partition 400. The two ends of the second terminal 500 are respectively located in the first cavity 150 and the second cavity 160. In this embodiment, the second terminal 500 is preferably threadedly connected to the second mounting hole 410 of the partition 400 for ease of installation. There is at least one second terminal 500, and each second terminal 500 corresponds to the first terminal 500. The second terminal 500 is arranged side by side on the partition 400. The wiring opening 120 is connected to the first cavity 150, and the avoidance opening 130 is connected to the second cavity 160. The cables in the motor can be connected to one end of the first terminal 200 located in the first cavity 150. A cable is also connected between the other end of the first terminal 200 and the second terminal 500, thereby connecting the cables in the motor to the second terminal 500.

[0047] By adopting the above structure, the partition 400 can separate the wiring cavity 110 into a first cavity 150 connected to the inside of the motor and a second cavity 160 connected to the external power supply. When an explosion occurs inside or outside the motor, the partition 400 can effectively block the impact and / or flames generated by the explosion, ensuring that the interior of the junction box has reliable explosion-proof performance.

[0048] Furthermore, the wiring opening 120 and the avoidance opening 130 are arranged relative to each other, and the opening directions of the wiring opening 120 and the avoidance opening 130 are parallel to the plate surface of the partition 400. The above arrangement can greatly improve the explosion-proof performance of the junction box. The box body 100 has open sides on both sides of the plate surface of the vertical partition 400, one of which is arranged relative to one of the end surfaces of the partition 400, and the other open side is arranged relative to the other end surface of the partition 400. The explosion-proof junction box includes a connecting plate 600 corresponding to the open side one by one, and the connecting plate 600 is detachably sealed on the open side. By adopting the above structure, during the assembly of the junction box, it is only necessary to first remove the connecting plate 600 from the box body 100, and the operator can easily install the first terminal 200 and the connecting cable through the open side.

[0049] Preferably, a flange portion 170 is formed on the outer edge of the box body 100 corresponding to the open side, and the connecting plate 600 is adapted to be in contact with the flange portion 170, and the two can be fastened together by screws. A sealing member made of an elastic material, such as a rubber ring or silicone ring, can be disposed between the flange portion 170 and the connecting plate 600. The sealing member is disposed around the opening of the open side to improve the sealing performance of the connecting plate 600 and the flange portion 170 after connection.

[0050] The assembly process of the explosion-proof junction box of the present invention is as follows: the welding portion 230 of the first terminal 200 is inserted into the first mounting hole 310 of the auxiliary plate 300, and the second end 212 of the outer sleeve 210 is abutted against the outer end of the first mounting hole 310, and then the welding structure is extended into the first mounting hole 310 from the inner end of the first mounting hole 310 to weld the welding portion 230 to the inner edge of the first mounting hole 310, and the above steps are repeated until all the first terminal posts 200 are welded; the second terminal posts 500 are threadedly connected to the partition 400 until all the second terminal posts 500 are connected, and then the connecting plate 600 is fixed to the open side of the box body 100 to complete the installation.

[0051] In addition, the utility model also provides an explosion-proof motor, including a casing (not shown), a motor body (not shown) and the aforementioned explosion-proof junction box. The casing is provided with an opening, the explosion-proof junction box is installed on the casing, and the wiring opening 120 is connected to the opening of the casing. The motor body is installed in the casing, and its cable extends into the explosion-proof junction box through the opening and the wiring opening 120 to connect with one end of the second terminal 500. A cable is connected between the other end of the second terminal 500 and one end of the first terminal 200, and the other end of the first terminal 200 is connected to an external power supply.

[0052] The above description is only an implementation method of the present application and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the description and drawings of this application, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. An explosion-proof junction box, characterized in that: include: The box body (100) has a wiring cavity (110) formed therein, and the box body (100) is provided with an escape opening (130) communicating with the wiring cavity (110) and the outside; An auxiliary plate (300) is sealed outside the avoidance opening (130), and the auxiliary plate (300) is provided with at least one first mounting hole (310), and two ends of the first mounting hole (310) are respectively connected to the avoidance opening (130) and the outside; A first terminal (200) corresponds one-to-one to the first mounting hole (310), one end of the first terminal (200) is passed through the first mounting hole (310), and the other end is located outside; The first terminal (200) is welded to the first mounting hole (310), and the auxiliary plate (300) is welded to the box body (100).

2. The explosion-proof junction box according to claim 1, characterized in that: The first terminal (200) comprises: The outer sleeve (210) includes a first end (211) and a second end (212) opposite to the first end (211), and a connecting hole (213) is formed through the outer sleeve (210) in a direction from the first end (211) to the second end (212); A terminal body (220) is installed in the connection hole (213) from the first end (211); A welding portion (230) is connected to the second end (212), and the welding portion (230) is provided with a receiving hole (231) communicating with the first mounting hole (310) and the connecting hole (213); The welding portion (230) is adapted to be inserted into the first mounting hole (310) and to force the second end (212) to abut against the outer end of the first mounting hole (310), and the welding portion (230) is welded to the inner wall of the first mounting hole (310).

3. The explosion-proof junction box according to claim 2, characterized in that: The outer sleeve (210) and the welding portion (230) are both cylindrical structures and coaxial, the outer diameter of the outer sleeve (210) is larger than the inner diameter of the first mounting hole (310), and the outer diameter of the welding portion (230) is not larger than the inner diameter of the first mounting hole (310).

4. The explosion-proof junction box according to claim 2, characterized in that: The first mounting hole (310), the connecting hole (213) and the receiving hole (231) are coaxial.

5. The explosion-proof junction box according to claim 1, characterized in that: There are a plurality of first binding posts (200), which are arranged side by side on the auxiliary board (300).

6. The explosion-proof junction box according to claim 1, characterized in that: The outer wall of the box body (100) is provided with a positioning portion (140) for positioning the auxiliary plate (300), the positioning portion (140) is arranged outside the avoidance opening (130), and the auxiliary plate (300) is welded to the positioning portion (140).

7. The explosion-proof junction box according to any one of claims 1 to 6, characterized in that: The explosion-proof junction box also includes: A partition (400) is disposed in the wiring cavity (110) and is suitable for separating the wiring cavity (110) into a first cavity portion (150) and a second cavity portion (160) that are independent of each other; At least one second terminal (500) is fixedly provided on the partition (400), and two ends of the second terminal (500) are respectively located in the first cavity (150) and the second cavity (160); The avoidance opening (130) is in communication with the second cavity (160), and the box body (100) is provided with a wiring opening (120) in communication with the first cavity (150) and the outside.

8. The explosion-proof junction box according to claim 7, characterized in that: The wiring opening (120) and the avoidance opening (130) are arranged opposite to each other, and the opening directions of the wiring opening (120) and the avoidance opening (130) are both parallel to the plate surface of the partition (400).

9. The explosion-proof junction box according to claim 7, characterized in that: Both sides of the box body (100) in a direction perpendicular to the plate surface of the partition (400) are open sides, and the explosion-proof junction box includes connecting plates (600) corresponding to the open sides one by one, and the connecting plates (600) are detachably sealed on the open sides.

10. An explosion-proof motor, characterized in that: The invention comprises an explosion-proof junction box according to any one of claims 1 to 9.

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