Explosion-proof three-phase asynchronous motor

Abstract

The utility model discloses an explosion-proof three-phase asynchronous motor, and relates to the technical field of explosion-proof motors. The motor comprises a cylinder body, two ends of which are communicated and which is used for coaxially arranging a stator and a rotor; the end covers are detachably mounted at the two ends of the cylinder body, and the end covers are connected with the cylinder body through anti-explosion structures; the explosion-proof junction box is arranged on the top surface of the cylinder body, and the signal output end of the stator extends into the explosion-proof junction box and is communicated with a wiring terminal in the explosion-proof junction box; the anti-explosion structure comprises a bearing table constructed on the side wall of the end cover and a positioning cylinder constructed on the end wall of the cylinder body, an abutting table is constructed on the outer wall of the bearing table, the outer wall of the abutting table abuts against the inner wall of the positioning cylinder in an attached mode, the end wall of the positioning cylinder abuts against the side wall of the end cover in an attached mode, and an anti-explosion gap is constructed between the outer wall of the bearing table and the inner wall of the positioning cylinder. The explosion-proof gap is filled with flame-retardant asbestos; therefore, the purpose that the motor has stable explosion-proof performance is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of explosion-proof motors, in particular to a flameproof three-phase asynchronous motor. Background Art

[0002] Flameproof three-phase asynchronous motors are used as transmission machines in places where there are explosive gas environments.

[0003] In some places with explosion risks, when gas or dust encounters an ignition source or low temperature, it will extinguish or explode. When the motor is running, it can generate arcs or sparks, which are strong ignition sources and may explode when encountering explosive dust or gas. The explosion-proof principle of explosion-proof motors is to place the live parts of the motor in a special shell, which can separate the sparks and arcs generated by the electrical parts inside the shell from the explosive mixture outside the shell, and can withstand the explosion pressure generated when the explosive mixture entering the shell is ignited by the sparks and arcs of the electrical equipment inside the shell, without damaging the shell; at the same time, it prevents the explosion products inside the shell from spreading to the explosive mixture outside the shell, and will not cause the explosive mixture outside the shell to extinguish or explode.

[0004] Therefore, the design of the explosion-proof motor casing is the key to whether the explosion-proof performance is stable. Utility Model Content

[0005] The utility model aims to provide a flameproof three-phase asynchronous motor, so as to achieve the purpose of making the motor have stable explosion-proof performance.

[0006] In order to achieve the above purpose, the utility model adopts the following technical means:

[0007] A flameproof three-phase asynchronous motor, comprising:

[0008] The cylinder has two ends connected and is used to coaxially arrange the stator and the rotor;

[0009] End covers are detachably mounted on both ends of the cylinder, and the end covers are connected to the cylinder through an explosion-proof structure;

[0010] An explosion-proof junction box is installed on the top surface of the cylinder, and the signal output end of the stator extends into the explosion-proof junction box and is connected with the wiring terminal in the explosion-proof junction box;

[0011] The explosion-proof structure includes a receiving platform constructed on the side wall of the end cover and a positioning tube constructed on the end wall of the cylinder body, the outer wall of the receiving platform is constructed with an abutment platform, the outer wall of the abutment platform is fitted and abutted with the inner wall of the positioning tube, the end wall of the positioning tube is fitted and abutted with the side wall of the end cover, an explosion-proof gap is constructed between the outer wall of the receiving platform and the inner wall of the positioning tube, and the explosion-proof gap is filled with flame-retardant asbestos.

[0012] Preferably, the end cover includes a first end cover and a second end cover, the two ends of the rotor pass through the first end cover and the second end cover respectively, the second end cover is covered with a wind cover, and the end of the rotor extending out of the second end cover is coaxially mounted with a fan, and the fan is arranged in the wind cover.

[0013] Furthermore, one end of the rotor extending out of the first end cover is constructed with a steel key and is covered with fluororubber.

[0014] Furthermore, the explosion-proof junction box includes:

[0015] A box body is connected to the top surface of the cylinder body, and the top surface is open. The wiring terminal includes a plurality of vertical wiring bolts inserted and installed on the bottom surface of the box body, and a vertical grounding bolt inserted and installed on the bottom surface of the box body. The first end of the wiring bolt is arranged in the box body, and the second end of the wiring bolt extends out of the box body. The side wall of the box body is provided with a wire through hole, and the wire through hole passes through the top of the box body.

[0016] A box cover is buckled on the top surface of the box body, the box cover covers the top surface of the box body, and the bottom surface of the box cover blocks the top of the wire passing port to form an installation channel for installing the wiring seat;

[0017] The wiring seat includes a wiring box seat installed in the installation channel, the outer wall of the wiring box seat abuts the inner wall of the wire passing port, the top of the outer wall of the wiring box seat abuts the bottom surface of the box cover, and the wiring box seat is coaxially constructed with a wire passing channel connected to the inner cavity of the box body.

[0018] Furthermore, a receiving plate is provided on the top side of the outer wall of the box body, and the side edge of the box cover is detachably connected to the receiving plate via a first bolt.

[0019] Furthermore, an anti-loosening washer is provided between the bolt head of the first bolt and the top surface of the box cover.

[0020] During use, the utility model has the following beneficial effects:

[0021] The stator and rotor are set up by the cylinder, and the rotor is positioned by the end cover. At the same time, combined with the explosion-proof performance of the explosion-proof junction box, the impact on the overall explosion-proof performance of the motor due to the need for an external circuit is greatly improved. At the same time, for the combination of the cylinder and the end cover of the motor body, the design of the explosion-proof structure can not only improve the sealing performance of the entire motor, but also effectively isolate the explosion and improve the explosion-proof stability of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1It is a schematic diagram of the structure of the utility model.

[0023] Figure 2 It is a side structural schematic diagram of the utility model.

[0024] Figure 3 for Figure 1 Schematic diagram of the local enlarged structure at point A in the middle.

[0025] Figure 4 This is a schematic diagram of the structure of the explosion-proof junction box of the utility model.

[0026] Among them, 1-cylinder, 2-stator, 3-rotor, 4-end cover, 41-first end cover, 42-second end cover, 5-receiving platform, 6-positioning cylinder, 7-abutment platform, 8-explosion-proof gap, 9-wind hood, 10-fan, 11-steel key, 12-fluororubber, 13-box body, 14-connecting bolt, 15-grounding bolt, 16-wire port, 17-box cover, 18-junction box seat, 19-receiving plate, 20-first bolt. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0029] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features thereof may be combined with each other.

[0030] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0031] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the utility model product is usually placed when in use, or the positions or positional relationships commonly understood by those skilled in the art, which are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0032] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] Please refer to Figures 1 to 4 As shown, a flameproof three-phase asynchronous motor comprises:

[0034] The cylinder 1 has two ends connected and is used to coaxially arrange the stator 2 and the rotor 3;

[0035] End covers 4 are detachably mounted on both ends of the cylinder 1, and the end covers 4 are connected to the cylinder 1 through an explosion-proof structure;

[0036] An explosion-proof junction box is installed on the top surface of the cylinder 1, and the signal output end of the stator 2 extends into the explosion-proof junction box and is connected with the wiring terminal in the explosion-proof junction box;

[0037] The explosion-proof structure includes a receiving platform 5 constructed on the side wall of the end cover 4 and a positioning tube 6 constructed on the end wall of the cylinder 1. The outer wall of the receiving platform 5 is constructed with an abutment platform 7. The outer wall of the abutment platform 7 is fitted and abutted with the inner wall of the positioning tube 6. The end wall of the positioning tube 6 is fitted and abutted with the side wall of the end cover 4. An explosion-proof gap 8 is constructed between the outer wall of the receiving platform 5 and the inner wall of the positioning tube 6. The explosion-proof gap 8 is filled with flame-retardant asbestos.

[0038] In this way, the stator 2 and the rotor 3 are arranged by the cylinder 1, and the rotor 3 is positioned by the end cover 4. At the same time, combined with the explosion-proof performance of the explosion-proof junction box, the impact on the overall explosion-proof performance of the motor due to the need for an external circuit is greatly improved. At the same time, for the combination of the cylinder 1 and the end cover 4 of the motor body, the design of the explosion-proof structure can not only improve the sealing performance of the entire motor, but also effectively isolate the explosion and improve the explosion-proof stability of the motor.

[0039] At the same time, in order to improve the cooling performance of the motor at the same time, the end cover 4 includes a first end cover 41 and a second end cover 42, and the two ends of the rotor 3 pass through the first end cover 41 and the second end cover 42 respectively. The second end cover 42 is covered with a wind cover 9, and the end of the rotor 3 extending out of the second end cover 42 is coaxially installed with a fan 10, and the fan 10 is arranged in the wind cover 9.

[0040] Furthermore, one end of the rotor 3 extending out of the first end cover 41 is constructed with a steel key 11 and is sleeved with fluororubber 12 .

[0041] In addition, for explosion-proof junction boxes, it includes:

[0042] The box body 13 is open on the top surface, and a plurality of vertical connection bolts 14 are inserted and installed on the bottom surface, and a vertical grounding bolt 15 is inserted and installed at the same time, the first end of the connection bolt 14 is arranged in the box body 13, and the second end of the connection bolt 14 extends out of the box body 13, and the side wall of the box body 13 is provided with a wire opening 16, and the wire opening 16 passes through the top of the box body 13;

[0043] A box cover 17 is buckled on the top surface of the box body 13, the box cover 17 covers the top surface of the box body 13, and the bottom surface of the box cover 17 blocks the top of the wire opening 16 to form an installation channel for installing the wiring seat;

[0044] The wiring seat includes a wiring box seat 18 installed in the installation channel, the outer wall of the wiring box seat 18 abuts against the inner wall of the wire passing opening 16, the top of the outer wall of the wiring box seat 18 abuts against the bottom surface of the box cover 17, and the wiring box seat 18 is coaxially constructed with a wire passing channel connected to the inner cavity of the box body 13.

[0045] In this way, the box cover 17 and the box body 13 are buckled together, and the terminal block is installed in the wire opening 16. Under the action of the box cover 17, the terminal block is stably clamped and pressed in the installation channel, which not only realizes the stable installation of the terminal block, but also improves the sealing of the connection position between the terminal block and the entire box body 13. This prevents the external explosive medium from entering the junction box.

[0046] Furthermore, a receiving plate 19 is provided on the top side of the outer wall of the box body 13 , and the side edge of the box cover 17 is detachably connected to the receiving plate 19 via a first bolt 20 .

[0047] In addition, an anti-loosening washer is provided between the bolt head of the first bolt 20 and the top surface of the box cover 17 .

[0048] In this way, in order to ensure the explosion-proof performance of the casing, the first bolt 20 used for connection is equipped with an anti-loosening washer to prevent the first bolt 20 from loosening by itself. After the first bolt 20 and the screw hole are tightened, the metal thickness around the screw hole is not less than 1 / 3 of the threaded hole diameter, but at least 3mm.

[0049] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A flameproof three-phase asynchronous motor, characterized in that: include: The cylinder (1) has two ends connected thereto and is used for coaxially arranging the stator (2) and the rotor (3); End covers (4) are detachably mounted on both ends of the cylinder (1), and the end covers (4) are connected to the cylinder (1) via an explosion-proof structure; An explosion-proof junction box is installed on the top surface of the cylinder (1), and the signal output end of the stator (2) extends into the explosion-proof junction box and is connected to the wiring terminal in the explosion-proof junction box; The explosion-proof structure comprises a receiving platform (5) constructed on the side wall of the end cover (4) and a positioning tube (6) constructed on the end wall of the cylinder (1); the outer wall of the receiving platform (5) is constructed with an abutment platform (7); the outer wall of the abutment platform (7) is in close contact with the inner wall of the positioning tube (6); the end wall of the positioning tube (6) is in close contact with the side wall of the end cover (4); an explosion-proof gap (8) is constructed between the outer wall of the receiving platform (5) and the inner wall of the positioning tube (6); and the explosion-proof gap (8) is filled with flame-retardant asbestos.

2. A flameproof three-phase asynchronous motor according to claim 1, characterized in that: The end cover (4) comprises a first end cover (41) and a second end cover (42); two ends of the rotor (3) pass through the first end cover (41) and the second end cover (42) respectively; a wind shield (9) is mounted on the outside of the second end cover (42); a fan (10) is coaxially mounted on one end of the rotor (3) extending out of the second end cover (42); and the fan (10) is arranged in the wind shield (9).

3. A flameproof three-phase asynchronous motor according to claim 2, characterized in that: One end of the rotor (3) extending out of the first end cover (41) is provided with a steel key (11) and is sleeved with fluororubber (12).

4. A flameproof three-phase asynchronous motor according to claim 1, characterized in that: The explosion-proof junction box comprises: A box body (13) is connected to the top surface of the cylinder (1), and the top surface is open. The wiring terminal comprises a plurality of vertical wiring bolts (14) inserted and installed on the bottom surface of the box body (13), and a vertical grounding bolt (15) inserted and installed on the bottom surface of the box body (13). The first end of the wiring bolt (14) is arranged in the box body (13), and the second end of the wiring bolt (14) protrudes from the box body (13). The side wall of the box body (13) is provided with a wire opening (16), and the wire opening (16) passes through the top of the box body (13); A box cover (17) is buckled onto the top surface of the box body (13), the box cover (17) covers the top surface of the box body (13), and the bottom surface of the box cover (17) blocks the top of the wire passage (16), thereby forming an installation channel for installing a wiring socket; The wiring seat comprises a wiring box seat (18) which is inserted into the installation channel, the outer wall of the wiring box seat (18) abuts against the inner wall of the wire passage opening (16), the top of the outer wall of the wiring box seat (18) abuts against the bottom surface of the box cover (17), and the wiring box seat (18) is coaxially structured with a wire passage communicating with the inner cavity of the box body (13).

5. A flameproof three-phase asynchronous motor according to claim 4, characterized in that: A receiving plate (19) is provided on the top side of the outer wall of the box body (13), and the side edge of the box cover (17) is detachably connected to the receiving plate (19) via a first bolt (20).

6. A flameproof three-phase asynchronous motor according to claim 5, characterized in that: An anti-loosening washer is provided between the bolt head of the first bolt (20) and the top surface of the box cover (17).

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