CN212811455U

CN212811455U - Explosion-proof motor junction box

Info

Publication number: CN212811455U
Application number: CN202021885865.8U
Authority: CN
Inventors: 孟陈力; 孙即明; 宋清江
Original assignee: Qingdao CCS Electric Corp
Current assignee: Qingdao CCS Electric Corp
Priority date: 2020-09-01
Filing date: 2020-09-01
Publication date: 2021-03-26
Anticipated expiration: 2030-09-01

Abstract

The utility model discloses a flame proof motor terminal box (100). It is installed on the shell (105) of flame proof motor to include: a junction box cavity (101); a terminal fixing plate (102) which is detachably arranged in the junction box cavity (101) and on which a plurality of connection terminals (103) for connecting electric cables are arranged; and a cover plate (104) detachably connected to the top of the junction box cavity (101) to seal the junction box cavity (101). The utility model discloses a motor terminal box (100) simple structure, reasonable in design, leakproofness are good to its terminal fixing plate (102) detachably is connected with terminal box cavity (101), thereby makes the utility model discloses a motor terminal box (100) are convenient for processing production and assembly and maintenance.

Description

Explosion-proof motor junction box

Technical Field

The present invention relates generally to the field of electric motors. More specifically, the utility model relates to a flame proof motor terminal box.

Background

Generally, the operation space under a mine is narrow, so that the volume of the explosion-proof type three-phase asynchronous motor used is required to be not too large beyond the power required by the underground operation. This requires that the space occupied by the terminal block on the motor must not be excessive. The motor junction box is used for leading the cable inside the motor and the cable outside the motor into the junction box respectively and connecting the cable inside the junction box and the cable outside the motor. The existing motor junction box is too large in size due to design reasons, and the requirement of underground operation cannot be met. Secondly, the explosion phenomenon is easy to occur in underground operation, especially in underground operation in coal mine and other environments. Therefore, explosion-proof requirements among all parts in the junction box are required, and the whole junction box is required to have good sealing performance so as to prevent dust and other media from entering the junction box to cause explosion of the junction box. The internal design of the existing junction box does not meet the explosion-proof requirement, and because the sealing performance is poor, explosion is easy to generate, thereby bringing about potential safety hazards in production. In addition, the existing junction box has poor part corrosion resistance, so that the inside of the junction box rusts, the use of the junction box is influenced, and potential safety hazards are brought. Furthermore, existing junction boxes tend to be of one-piece construction, which can present difficulties in production, assembly, and later maintenance.

SUMMERY OF THE UTILITY MODEL

For one or more problems among the solution above-mentioned background art to can realize carrying out the demand of safety connection with the inside cable conductor of motor and the outside cable conductor of motor, the utility model provides a flame proof motor terminal box. The wiring bolt of the junction box adopts an integrated structure, and is connected with a cable inside the motor through a cylindrical hole pressed at the bottom end of the wiring bolt, so that the wiring bolt has good electric conductivity, is simple and convenient and is reliable in connection. Simultaneously the utility model discloses a terminal box adopts terminal fixing plate to carry out transitional coupling, when convenient dismantlement and maintenance, has realized processing flame proof screw thread on the plane to the drawback of processing flame proof screw thread has been avoided at the casing cambered surface.

Specifically, the utility model discloses a flame proof motor terminal box. This terminal box includes: a junction box cavity; a terminal fixing plate detachably disposed in the junction box cavity and having a plurality of connection terminals for connecting electric cables disposed thereon; and the cover plate is detachably connected to the top of the junction box cavity to seal the junction box cavity.

In one embodiment, the terminal includes a terminal bolt and an insulating sleeve, wherein the terminal bolt extends through the insulating sleeve.

In another embodiment, the matching surface between the inner wall of the insulating sleeve and the outer wall of the wiring bolt is an explosion-proof surface meeting the explosion-proof requirement.

In still another embodiment, the insulating sleeve is provided with an explosion-proof thread for explosion-proof on the periphery.

In one embodiment, the terminal bolt has a first end and a second end, wherein the first end is arranged with a cylindrical hole for fixing the cable inside the motor, and the second end is connected with a compression nut for compressing the cable outside the motor on the second end.

In another embodiment, the side of the junction box is provided with a wire passing port and/or an interface for connecting a cable outside the motor into the junction box.

In yet another embodiment, an internal grounding post for ensuring grounding safety is disposed within the junction box cavity.

In one embodiment, the cover plate is connected to the junction box cavity by fastening screws, and a sealing ring groove is disposed on the cover plate, and a sealing ring for sealing the junction box is disposed in the sealing ring groove.

In another embodiment, the matching surface between the cover plate and the cavity of the junction box is an explosion-proof surface meeting the explosion-proof requirement.

In a further embodiment, the plurality of connection terminals comprises connection terminals for connecting a supply cable and/or connection terminals for connecting control signals.

The utility model discloses a fitting surface of terminal box through set up sealing washer and flame proof between apron and terminal box cavity makes the whole leakproofness of terminal box good on the one hand, and on the other hand has promoted the explosion-proof performance of motor when borehole operation effectively. In addition, the explosion-proof matching surface is arranged between the inner wall of the insulating sleeve and the outer wall of the wiring bolt, and the explosion-proof threads are arranged on the periphery of the insulating sleeve, so that the explosion-proof performance of the motor is further improved.

Drawings

The above and other objects, features and advantages of exemplary embodiments of the present invention will become readily apparent from the following detailed description read in conjunction with the accompanying drawings. In the accompanying drawings, several embodiments of the present invention are illustrated by way of example and not by way of limitation, and like reference numerals designate like or corresponding parts, in which:

fig. 1 is a sectional structural view showing a junction box according to an embodiment of the present invention;

fig. 2 is a structural view showing a connection terminal according to an embodiment of the present invention; and

fig. 3 is a perspective view showing a junction box according to an embodiment of the present invention.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. Based on the embodiments in the present invention, all other embodiments obtained by the skilled in the art without creative work belong to the protection scope of the present invention.

Fig. 1 is a sectional structure view illustrating a junction box 100 according to an embodiment of the present invention. For a better understanding of the position of the terminal box according to the invention on the electric motor, fig. 1 also depicts a motor housing 105 and a stator 106 of the electric motor. The terminal box 100 is fixedly connected to the motor housing.

As shown in fig. 1, a terminal box 100 (see the portion in the dashed square frame in fig. 1) of the present invention may include a terminal box cavity 101, a terminal fixing plate 102, a plurality of terminals 103 (see the portion in the dashed oval frame in fig. 1) arranged on the terminal fixing plate, and a cover plate 104. According to different application scenarios, the junction box cavity may be, for example, a rectangular parallelepiped, a cube, or another shape such as an arc, which may include a side panel and a bottom panel. In one embodiment, the bottom plate of the junction box cavity may be annular, and the inner end of the annular shape may be rectangular or circular or other shapes. The terminal fixing plate is detachably mounted on the annular bottom plate of the junction box cavity, and the terminal fixing plate and the bottom plate can be fixedly connected in a bolt mode for example. In order to ensure the sealing performance of the junction box, a sealing ring can be arranged between the terminal fixing plate and the bottom plate.

In one embodiment, connection terminals for connecting the external cable lines and the internal cable lines of the motor are arranged on the terminal fixing plate. The terminal block penetrates the terminal fixing plate, and a sealing process is performed at the penetration. The upper end of the wiring terminal is connected with a cable outside the motor, and the lower end of the wiring terminal is connected with the cable inside the motor. Holes are arranged on a shell of the motor, which is positioned at the lower part of the junction box cavity, so that cables inside the motor, such as cables on a stator of the motor, can be connected with the lower ends of the wiring terminals.

In another embodiment, the cover plate is detachably connected to the top of the junction box cavity to seal the junction box cavity. Preferably, a matching body is arranged along the top opening of the junction box cavity, a matching surface 107 connected with the cover plate is arranged at the upper part of the matching body, and the length of the matching surface ensures that the matching body has an explosion-proof function. As a specific embodiment, a screw hole is provided on the mating surface, so that the cover plate can be connected with the junction box cavity through a screw or bolt 108. In order to increase the sealing performance, a sealing ring groove is arranged on the cover plate or the matching surface, and a sealing ring for sealing the junction box cavity is arranged in the sealing ring groove.

In another embodiment, an internal grounding post 109 for securing grounding is disposed within the junction box cavity. One end of the inner grounding column is used for being connected with each part of the junction box which needs to be grounded, and the other end of the inner grounding column is connected with the ground.

Fig. 2 is a structural view showing the connection terminal 103 according to an embodiment of the present invention.

As shown in fig. 2, in one embodiment, the connection terminal 103 of the present invention may include an insulation sleeve 201 and a connection bolt 202 penetrating through the insulation sleeve. The terminal bolt may be made of, for example, a red copper material, which may include a screw and a nut. A nut 203 and a stopper 204 are provided at one end of the terminal bolt, and a cable outside the motor is wound between the nut and the stopper, and the nut is tightened to compress the cable between the nut and the stopper. Alternatively, the blocking body may be another nut, for example, and the cable wound around the outside of the motor between the two nuts is compressed by tightening the two nuts. A cylindrical hole 205 is disposed at the other end of the binding bolt, and the cable inside the motor is inserted into the cylindrical hole, and the cylindrical hole fastens the cable inside the motor by pressing the outer surface of the cylindrical hole. Finally, the connection of the cable outside the motor with the cable inside the motor is achieved. The utility model discloses a binding post is because its screw rod is upper and lower body structure, therefore simple structure, safe and reliable and electric conductive property is good.

In one embodiment, the insulating sleeve may be made of a fiberglass molding compound insulating tube in combination with a brass H62 threaded sleeve. The insulating sleeve is used for insulating and isolating the wiring terminal and the cavity of the junction box. And explosion-proof threads are arranged on the inner wall of the threaded sleeve, so that the matching surface 206 between the inner wall of the insulating sleeve and the outer wall of the wiring bolt is an explosion-proof surface meeting the explosion-proof requirement. In another embodiment, the insulating sleeve is provided with an explosion-proof thread 207 for explosion-proof on the periphery. Through insulating sleeve's inner wall and periphery equipartition have put the flame proof screw thread, thereby further strengthened the utility model discloses an explosion-proof performance of terminal box.

Fig. 3 is a perspective view illustrating the junction box 100 according to an embodiment of the present invention. It will be appreciated that fig. 3 may better illustrate the connection of the junction box of the present invention to the motor. And the junction box in fig. 3 does not depict a cover plate in order to show the internal construction of the junction box more clearly.

As shown in fig. 3, in one embodiment, the terminal box 100 of the present invention can be fixedly mounted on the housing 105 of the motor by means of bolts or welding. The junction box may be a cuboid or other shape. The cavity 101 may be welded, for example, by a Q345 process, and the plurality of terminals 103 received inside the cavity may include terminals for connecting a power supply cable and/or terminals for connecting a control signal. Specifically, the number of the terminals may be 8, for example, 6 of the terminals are used for connecting the power supply cable outside the motor with the stator inside the motor, and the remaining 2 terminals are used for connecting the data line outside the motor with the data line inside the motor. The data line inside the motor may be used, for example, to transmit information such as the temperature inside the motor.

In another embodiment, the side of the junction box of the present invention is arranged with a wire passing port and/or interface 301 for connecting a cable wire outside the motor into the junction box. When the side part of the junction box is provided with the wire passing port, the wire passing port is sealed with the cable outside the motor so as to prevent external dust from entering the junction box. In this case, the cable outside the motor is fixedly connected with the upper end of the wiring terminal through a nut. The lower end of the wiring terminal is connected with a cable inside the motor through the cylindrical hole. Finally, the cable wire outside the motor is connected with the cable wire inside the motor through a wiring terminal, so that the motor is powered on or temperature information inside the motor is transmitted to an upper computer outside the motor.

When the side of the junction box is provided with the interface, the interface can be fixedly arranged on the side panel of the junction box through screws, and the interface and the side panel are sealed to prevent external dust from entering the junction box. Under the condition, the cable outside the motor is inserted into the interface in a plug mode, so that the cable outside the motor can be conveniently inserted. Further, the interface is connected with the upper end of the wiring terminal through a short wire. The lower end of the wiring terminal is connected with a cable inside the motor through the cylindrical hole. Finally, will through binding post, stub and interface the outside cable conductor of motor with the inside cable conductor of motor is connected, thereby realizes right the motor supplies power or will the inside temperature information of motor conveys the outside host computer of motor.

It should be understood that the terms "first," "second," "third," and "fourth," etc. in the claims, description, and drawings of the present invention are used for distinguishing between different objects and not for describing a particular order. The terms "comprises" and "comprising," when used in the specification and claims of the present invention, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only, and is not intended to be limiting of the invention. As used in the specification and claims of this application, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should be further understood that the term "and/or" as used in the specification and claims of the present invention refers to any and all possible combinations of one or more of the associated listed items and includes such combinations.

Although the present invention has been described with reference to the above embodiments, the description is only for the convenience of understanding the present invention, and is not intended to limit the scope or application of the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. The utility model provides a flame proof motor terminal box, its installs on the shell of flame proof motor, its characterized in that includes:

a junction box cavity;

a terminal fixing plate detachably disposed in the junction box cavity and having a plurality of connection terminals for connecting electric cables disposed thereon; and

and the cover plate is detachably connected to the top of the junction box cavity to seal the junction box cavity.

2. The flameproof motor junction box of claim 1, wherein the terminal comprises a terminal bolt and an insulating sleeve, wherein the terminal bolt penetrates through the insulating sleeve.

3. The flameproof motor junction box of claim 2, wherein a mating surface between the inner wall of the insulating sleeve and the outer wall of the terminal bolt is a flameproof surface meeting flameproof requirements.

4. The flameproof motor junction box of claim 2, wherein flameproof threads for flameproofing are arranged on the outer circumference of the insulating sleeve.

5. The flameproof motor junction box of claim 2, wherein the junction bolt has a first end and a second end, wherein the first end is provided with a cylindrical hole for fixing a cable inside the motor, and the second end is connected with a compression nut to compress the cable outside the motor on the second end.

6. The flameproof motor junction box of claim 5, wherein a wire passing port and/or an interface for connecting a cable outside the motor into the junction box are arranged at the side of the junction box.

7. The flameproof motor junction box of claim 1, wherein an internal grounding post for ensuring grounding safety is arranged in the junction box cavity.

8. The flameproof motor junction box of claim 1, wherein the cover plate is connected with the junction box cavity through a fastening screw, and a seal ring groove is arranged on the cover plate, and a seal ring for sealing the junction box is arranged in the seal ring groove.

9. The flameproof motor junction box of claim 1, wherein the mating surface between the cover plate and the junction box cavity is a flameproof surface meeting flameproof requirements.

10. The flameproof motor junction box of any of claims 1-9, wherein the plurality of terminals comprise terminals for connecting power cables and/or terminals for connecting control signals.