Axial magnetic field motor

Abstract

The invention discloses an axial magnetic field motor, which is used for installing a motor main body, and comprises: a casing main body which is provided with a first installation cavity, and the two ends of the casing main body in the axial direction of the motor main body are both open ends communicated with the first installation cavity; the number of the end shells is two, the two end shells are arranged at the different opening ends respectively, each end shell comprises a cover body and a first barrel connected with the cover body, the cover bodies cover the opening ends in a sealing mode, and the first barrels extend into the first mounting cavity from the opening ends; wherein the two first barrel bodies extend towards each other and are adjacent to each other so as to be matched to define a second mounting cavity for accommodating the motor main body, the cover body is in fit contact with the end surface of the opening end, and the outer edges of the first barrel bodies are in fit contact with the inner edge of the first mounting cavity. By adopting the structure, the explosion-proof performance of the motor can be effectively improved, and the reliability of the motor in the working process is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to an axial magnetic field motor. Background Art

[0002] When the motor works in an environment with flammable and explosive gas or dust, high heat and electric sparks may ignite or detonate the flammable and explosive gas or dust, thus causing serious safety accidents. Therefore, in coal mines, oil and gas, petrochemical and other working environments, explosion-proof motors are mainly used for operation. Explosion-proof motors have a structure different from that used in ordinary environments. They can prevent the flammable gas and / or dust outside the motor from entering the motor to the greatest extent, and will not lead the flames out of the casing to ignite the surrounding flammable gas and / or dust.

[0003] Although the existing explosion-proof motors also have the above-mentioned explosion-proof function, their safety performance is still poor. For example, Chinese utility model patent CN201520010411.9 discloses an explosion-proof disc flat pulley motor, including a motor housing, a front cover and a rear cover connected to the axial ends of the motor housing, and the motor housing, the front cover and the rear cover cooperate to form a closed space for accommodating the motor rotor and stator. An L-shaped explosion-proof joint surface is formed between the front cover and the motor housing, and at the connection between the rear cover and the motor housing to achieve explosion-proof performance. However, although the above-mentioned structure can meet some explosion-proof requirements, when an explosion occurs inside the motor, there is still a probability that sparks will be transmitted to the outside along the explosion-proof joint surface, resulting in poor explosion-proof reliability.

[0004] Therefore, it is necessary to improve the prior art to overcome the above defects in the prior art. Summary of the invention

[0005] The object of the present invention is to provide an axial magnetic field motor to effectively improve its explosion-proof performance.

[0006] The object of the present invention is to achieve the following technical solution: an axial magnetic field motor, comprising:

[0007] Motor body;

[0008] A casing body is formed with a first installation cavity, and both ends of the casing body in the axial direction of the motor body are open ends communicating with the first installation cavity;

[0009] Two end shells are provided at different opening ends respectively, the end shells comprising a cover body and a first cylinder connected to the cover body, the cover body seals the outside of the opening end, and the first cylinder extends from the opening end into the first installation cavity;

[0010] The two first cylinders extend toward each other and are adjacent to each other to cooperate to form a second installation cavity for accommodating the motor body, the cover body and the end surface of the opening end are in close contact, and the outer edge of the first cylinder is in close contact with the inner edge of the first installation cavity.

[0011] Furthermore, there is a gap or fit between the two opposite ends of the first cylinders in the extension direction of the first cylinders.

[0012] Furthermore, the motor body comprises:

[0013] A rotating shaft, rotatably mounted on the cover body and at least partially located in the second mounting cavity;

[0014] There are two stators, which are respectively fixedly accommodated in different first cylinders;

[0015] a rotor, fixedly connected to the rotating shaft, the rotor being received in the second mounting cavity and being located between the two stators;

[0016] Wherein, the rotating shaft, the stator and the rotor are coaxially arranged, and their axial direction is the axial direction of the motor body.

[0017] Furthermore, when the stator is accommodated and installed in the first cylinder, the axial height of the first cylinder in the motor body is greater than the axial height of the stator.

[0018] Furthermore, the axial magnetic field motor further comprises:

[0019] A bearing, sleeved outside the rotating shaft, the bearings are at least two in number and are disposed at both ends of the rotor;

[0020] A limiting sleeve, a fixed sleeve arranged outside the rotating shaft, the limiting sleeves are at least two in number and are arranged at both ends of the rotor, the limiting sleeves are located between the bearing and the rotor, and close to the end of the rotor;

[0021] Wherein, the end shell includes a second cylinder connected to the cover body and accommodated in the first cylinder, the stator is located between the first cylinder and the second cylinder, the two second cylinders extend toward each other to the ends of the rotor, the bearing and the limit sleeve at one end of the rotor are accommodated in one of the second cylinders, and the bearing and the limit sleeve at the other end are accommodated in the other second cylinder.

[0022] Furthermore, the axial magnetic field motor includes a heat dissipation cover fixedly accommodated in the first cylinder, the stator is adjacent to one end of the heat dissipation cover facing away from the cover body, the heat dissipation cover, the cover body and the first cylinder cooperate to form a cooling cavity for circulation of cooling medium, and the heat dissipation cover is provided with a plurality of drainage ribs protruding from one end of the cover body, and the drainage ribs are suitable for guiding the flow of cooling medium.

[0023] Furthermore, the casing body has a first wiring opening in the radial direction of the motor body, and the first wiring opening is communicated with the first mounting cavity. The axial magnetic field motor also includes a terminal box arranged on the casing body and connected to the first wiring opening. The first cylinder has a second wiring opening at a position corresponding to the first wiring opening.

[0024] Furthermore, the contacting parts of the casing body and the end casing are both textured surfaces, and the contacting parts are coated with sealant; and / or, the contacting parts of the casing body and the junction box are both textured surfaces, and the contacting parts are coated with sealant.

[0025] Furthermore, the junction box comprises:

[0026] A box body is formed with a lead cavity;

[0027] a partition plate, arranged in the wire guide cavity and adapted to separate the wire guide cavity into a first cavity portion and a second cavity portion which are independent of each other, wherein the first cavity portion is provided with a third wire guide opening connected to the first wire guide opening;

[0028] A plurality of first connecting posts are arranged on the partition plate, and two ends of the first connecting posts are respectively located in the first cavity and the second cavity;

[0029] A plurality of second connecting posts are arranged on the box body, one end of which extends into the second cavity and the other end is located outside.

[0030] Furthermore, the junction box includes an auxiliary plate welded between the box body and the second terminal, the auxiliary plate is provided with a mounting hole for the second terminal to pass through, and the box body is provided with an avoidance opening at a position corresponding to the auxiliary plate, and the avoidance opening is respectively communicated with the second cavity and the mounting hole.

[0031] Furthermore, the box body is provided with a vent hole communicating with the first cavity, and the junction box comprises:

[0032] A vent valve connected to the outer end of the vent hole;

[0033] A second plug, comprising a second plug body and a second cover connected to the second plug body, wherein the second plug body is inserted into the air vent, and the second cover covers the inner end of the air vent;

[0034] a fastener, adapted to fasten the second cover portion to the first cavity portion;

[0035] There is an explosion-proof gap between the second cover and the inner wall of the first cavity, there is an explosion-proof gap between the second plug body and the air hole, and the air valve is suitable for being connected to the first cavity through the explosion-proof gap.

[0036] Compared with the prior art, the present invention has the following beneficial effects: by adopting the above-mentioned structure, the cover body and the end face of the opening end are in close contact, and the outer edge of the first cylinder is in close contact with the inner edge of the first installation cavity, and the two cooperate with each other to form a stop-type explosion-proof joint surface, so as to effectively separate the internal space of the motor casing from the outside world and improve the explosion-proof performance of the motor; the two first cylinders extend toward each other and are adjacent to each other, which effectively increases the explosion-proof joint surface formed between the first cylinder and the casing body, and the isolation effect of the motor casing is better, and because the motor body is accommodated in the second installation cavity, the motor body and the explosion-proof joint surface will be blocked by the inner wall of the second installation cavity, which further improves the isolation effect and explosion-proof performance between the motor body and the explosion-proof joint surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the exploded structure of the axial magnetic field motor of the present invention.

[0038] Figure 2 It is a cross-sectional schematic diagram of the axial magnetic field motor of the present invention.

[0039] Figure 3 It is a schematic diagram of the exploded structure of the end shell and the heat dissipation cover of the present invention.

[0040] Figure 4 yes Figure 3 Schematic diagram in the other direction.

[0041] Figure 5 It is a cross-sectional schematic diagram of the junction box in the present invention.

[0042] Figure 6 It is a schematic diagram of the exploded structure of the junction box in the present invention.

[0043] Figure 7 It is a cross-sectional schematic diagram of a junction box provided with a vent valve in the present invention.

[0044] Description of reference numerals:

[0045] 100, motor body; 110, shaft; 111, shoulder; 120, stator; 130, rotor; 200, housing body; 210, first installation cavity; 220, open end; 221, first connection hole; 230, first wiring opening; 240, flange; 300, end shell; 310, cover; 311, second connection hole; 312, avoidance hole; 313, auxiliary hole; 320, first cylinder; 321, first flange; 3211, third connection hole; 322, second wiring opening; 330, second installation cavity; 340, second cylinder; 341, second flange; 3411, fourth connection hole; 400, bearing; 500, limit sleeve; 600, heat dissipation cover; 610, drainage rib; 620, fifth connecting hole; 630, sixth connecting hole; 700, first plug; 710, first plug body; 720, first cover; 800, junction box; 810, box body; 811, first cavity; 812, second cavity; 813, third wiring opening; 814, avoidance opening; 815, vent; 820, partition; 830, first terminal; 840, second terminal; 841, sleeve; 8411, welding part; 842, terminal body; 850, connecting plate; 860, auxiliary plate; 861, mounting hole; 870, vent valve; 880, second plug; 881, second plug body; 882, second cover; 890, fastener; 891, spring washer. DETAILED DESCRIPTION

[0046] In order to make the above-mentioned purposes, 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 is to 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 structures related to the present application are shown in the accompanying drawings, rather than all structures. 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.

[0047] The terms "including" and "having" and any variations thereof in this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products or devices.

[0048] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0049] See also Figure 1 and Figure 2 As shown, an axial magnetic field motor corresponding to a preferred embodiment of the present invention includes an explosion-proof casing and a motor body 100 installed in the explosion-proof casing. The explosion-proof casing can reliably isolate the motor body 100 from the outside world, prevent external flammable gas and / or dust from entering the casing, and at the same time avoid sparks in the casing from being led out of the casing to ignite external flammable gas and / or dust.

[0050] The explosion-proof housing includes a housing body 200 and an end housing 300. The housing body 200 is formed with a first mounting cavity 210. Both ends of the housing body 200 in the axial direction of the motor body 100 are open ends 220 that communicate with the first mounting cavity 210. There are two end housings 300, which are respectively arranged at different opening ends 220. The end housing 300 includes a cover body 310 and a first cylinder body 320 connected to the cover body 310. The cover body 310 is sealed outside the opening end 220. The first cylinder body 320 is arranged on the end surface of the cover body 310 facing the opening end 220. The first cylinder body 320 can extend from the opening end 220 into the first mounting cavity 210. The cover body 310 and the first cylinder body 320 can be integrally formed or assembled together after being separately formed. In this embodiment, the cover body 310 and the first cylinder body 320 are preferably integrally formed to facilitate assembly and improve structural strength.

[0051] When the end shell 300 is assembled to the housing body 200, the end surfaces of the cover body 310 and the open end 220 are in contact with each other, and the outer edge of the first cylinder 320 is in contact with the inner edge of the first installation cavity 210. Preferably, the two first cylinders 320 extend toward each other and are adjacent to each other to cooperate to form a second installation cavity 330, and the motor body 100 is accommodated in the second installation cavity 330. The opposite ends of the two first cylinders 320 may have a gap or fit in the extension direction of the first cylinder 320, and the present invention is not limited here.

[0052] By adopting the above-mentioned structure, the cover body 310 and the end face of the opening end 220 are in close contact with each other, and the outer edge of the first cylinder 320 is in close contact with the inner edge of the first installation cavity 210. The two cooperate with each other to form a stop-type explosion-proof joint surface, so as to effectively separate the internal space of the casing from the outside world, thereby improving the explosion-proof performance of the explosion-proof casing; the two first cylinders 320 extend toward each other and are adjacent to each other, which effectively increases the explosion-proof joint surface formed between the first cylinder 320 and the casing body 200, and the isolation effect of the explosion-proof casing is better. Since the motor body 100 is accommodated in the second installation cavity 330, the motor body 100 and the explosion-proof joint surface will be blocked by the inner wall of the second installation cavity 330, further improving the isolation effect and explosion-proof performance between the motor body 100 and the explosion-proof joint surface.

[0053] Furthermore, the casing body 200 and the end shell 300 are preferably made of steel to improve the structural strength of the casing and improve the explosion-proof performance. The contact parts of the casing body 200 and the end shell 300 are both textured surfaces, and the contact parts are coated with sealant to improve the sealing of the joint surface formed by the two. The end faces of the two opening ends 220 are both inwardly concave with first connecting holes 221, and there are multiple first connecting holes 221, which are arranged at intervals along the circumference of the opening end 220. The contact part of the cover body 310 and the end face of the opening end 220 is penetrated with a plurality of second connecting holes 311, and the second connecting holes 311 correspond to the first connecting holes 221 one by one. A threaded part is connected between the first connecting hole 221 and the second connecting hole 311, and the threaded part includes but is not limited to screws, bolts, etc., to achieve the fastening between the casing body 200 and the end shell 300.

[0054] Preferably, the inner edge of the housing body 200 and the outer edge of the first cylinder 320 are both circular, which is convenient for processing and assembly, and can effectively increase the explosion-proof joint surface between the two. In addition, since the outer contour of the motor body 100 is usually circular, preferably, the inner edge of the first cylinder 320 is also circular, and the two first cylinders 320 are coaxially arranged, and the motor body 100 is coaxially arranged in the second installation cavity 330, thereby improving the installation convenience of the motor body 100.

[0055] Further, the motor body 100 includes a coaxially arranged shaft 110, a stator 120 and a rotor 130, and the axial direction thereof is the axial direction of the motor body 100. The shaft 110 is rotatably mounted on the cover 310, and at least part of it is located in the second mounting cavity 330. In the present embodiment, one of the covers 310 is provided with an escape hole 312, and one end of the shaft 110 extends to the outside through the escape hole 312 so as to be connected with an external load. Of course, in other embodiments, when the other end of the shaft 110 needs to be extended out of the housing, the other cover 310 may also be provided with an escape hole 312 for the shaft 110 to extend out. There are two stators 120, and they are fixedly accommodated in different first cylinders 320 respectively. The outer diameter of the stator 120 is not greater than the inner diameter of the first cylinder 320. One end of the stator 120 in the axial direction may be abutted against the cover 310 for axial positioning and installation and fixing. When the stator 120 is accommodated and installed in the first cylinder 320, the height of the first cylinder 320 in the axial direction of the motor body 100 is greater than the axial height of the stator 120, that is, the stator 120 is recessed inward relative to the end of the first cylinder 320, so that there is a space between the stator 120 and the end of the first cylinder 320 for the rotor 130 to be accommodated and installed. The rotor 130 is fixedly connected to the rotating shaft 110, and the rotor 130 is accommodated in the second installation cavity 330 and is located between the two stators 120. The outer diameter of the rotor 130 is smaller than the inner diameter of the first cylinder 320 to ensure its smooth rotation. Of course, in other embodiments, only one stator 120 can be provided to be placed in one of the first cylinders 320, thereby forming a motor structure with a single stator and a single rotor.

[0056] Furthermore, the explosion-proof casing includes a bearing 400 mounted on the end casing 300, and the bearing 400 is sleeved outside the rotating shaft 110 to guide the rotating shaft 110 to rotate. The outer ring of the bearing 400 is fixed to the end casing 300, and the inner ring of the bearing 400 is fixed to the rotating shaft 110. There are at least two bearings 400, which are respectively arranged at both ends of the rotor 130. The bearings 400 at both ends of the rotor 130 can be respectively installed on different end casings 300, and the rotating shaft 110 has better reliability and more stable rotation after installation. The two ends of the rotor 130 specifically refer to the two ends of the rotor 130 in its axial direction. In this embodiment, the number of bearings 400 is preferably two to simplify the casing structure and installation process.

[0057] Preferably, a shoulder 111 is provided on the rotating shaft 110, and the shoulder 111 corresponds to the bearing 400 one by one. During installation, the bearing 400 is first put into the preset position of the rotating shaft 110, so that the end of the inner ring of the bearing 400 facing the rotor 130 abuts against the shoulder 111, and then the end shell 300 is installed to the casing body 200. At this time, the end of the outer ring of the bearing 400 facing away from the rotor 130 abuts against the cover body 310 to prevent the bearing 400 from axial displacement.

[0058] Further, the explosion-proof housing also includes a limit sleeve 500 fixedly sleeved outside the rotating shaft 110, and the number of the limit sleeves 500 is at least two, and they are arranged at both ends of the rotor 130. The limit sleeve 500 is located between the bearing 400 and the rotor 130, and is close to the end of the rotor 130 to prevent the rotor 130 from axial displacement. In this embodiment, the number of the limit sleeves 500 is preferably two to simplify the housing structure and installation process. Preferably, one of the limit sleeves 500 is integrally formed with the rotating shaft 110, and the other limit sleeve 500 is separately formed with the rotating shaft 110. When installing the rotor 130, the rotor 130 can be sleeved outside the rotating shaft 110 first, and one end of it can be abutted against the limit sleeve 500 formed on the rotating shaft 110, and then the other limit sleeve 500 can be sleeved on the rotating shaft 110 with an interference fit, so that it can be abutted against the other end of the rotating shaft 110. By adopting the above structure, the rotor 130 is easy to install and has higher positioning accuracy.

[0059] Preferably, the end shell 300 includes a second cylinder 340 connected to the cover body 310 and accommodated in the first cylinder 320, and the stator 120 is accommodated between the first cylinder 320 and the second cylinder 340. The two second cylinders 340 extend toward each other to the ends of the rotor 130, and the bearing 400 and the limiting sleeve 500 at one end of the rotor 130 are accommodated in one of the second cylinders 340, and the bearing 400 and the limiting sleeve 500 at the other end are accommodated in the other second cylinder 340.

[0060] Since the smooth and reliable rotation of the rotating shaft 110 depends on the reliability of the bearing 400, the present invention adopts the above-mentioned structure, and the bearing 400 is accommodated in the second cylinder 340. The limiting sleeve 500 is located at the extended end of the second cylinder 340. While realizing the axial limiting function of the rotor 130, it can also cooperate with the second cylinder 340 and the rotor 130 to form a stop-type explosion-proof joint surface, thereby effectively blocking the open end of the second cylinder 340. When there are sparks in the second mounting cavity 330, the sparks are not easy to enter the second cylinder 340, which effectively protects the bearing 400 and improves the reliability of the bearing 400 during operation.

[0061] The second cylinder 340 is preferably a cylindrical body with inner and outer edges coaxial with the first cylinder 320, the outer diameter of the rotor 130 is larger than the outer diameter of the second cylinder 340, and the inner diameter of the stator 120 is not smaller than the outer diameter of the second cylinder 340. The outer ring of the bearing 400 is interference fit with the inner edge of the second cylinder 340, the outer edge of the limiting sleeve 500 is clearance fit with the inner edge of the second cylinder 340, and the end of the rotor 130 is clearance fit with the open end of the second cylinder 340, so as to avoid affecting the rotation of the shaft 110 and improve the sealing performance of the open end of the second cylinder 340.

[0062] Furthermore, since the heat generated during the operation of the motor will affect its working efficiency, in the present embodiment, the explosion-proof casing includes a heat dissipation cover 600 fixedly received in the first cylinder 320 and located between the stator 120 and the cover body 310. The stator 120 is adjacent to the end of the heat dissipation cover 600 facing away from the cover body 310. The heat dissipation cover 600, the cover body 310 and the first cylinder 320 cooperate to form a cooling cavity (not shown) for the circulation of cooling medium. A medium inlet (not shown) and a medium outlet (not shown) communicating with the cooling cavity are provided on the end shell 300. The cooling medium is suitable for flowing into the cooling cavity through the medium inlet to absorb the heat transferred from the stator 120, and then the cooling medium after heat exchange flows out from the medium outlet.

[0063] Specifically, refer to Figure 3 and Figure 4 As shown, a circle of first flange 321 is convexly provided on the inner edge of the first cylinder 320, a circle of second flange 341 is convexly provided on the outer edge of the second cylinder 340, and the heat dissipation cover 600 is annular, and its outer edge is matched with the inner edge of the first cylinder 320, and its inner edge is matched with the outer edge of the second cylinder 340. The heat dissipation cover 600 is accommodated in the first cylinder 320, and the ends thereof are respectively abutted against the first flange 321 and the second flange 341. The stator 120 is fixed on the heat dissipation cover 600 to be close to the end surface of the heat dissipation cover 600 away from the first flange 321.

[0064] Furthermore, the heat dissipation cover 600 can be made of an aluminum plate, which has good heat dissipation performance and is easier to transfer heat between the stator 120 and the cooling medium. In addition, the heat dissipation cover 600 is provided with a plurality of drainage ribs 610 on the end surface facing the cover body 310. The drainage ribs 610 are located in the cooling cavity and are suitable for guiding the flow of the cooling medium so that the cooling medium can flow evenly to various positions in the cooling cavity, ensuring that the heat dissipation cover 600 dissipates heat evenly. In this embodiment, the plurality of drainage ribs 610 abut against the end surface of the cover body 310, thereby improving the support strength of the heat dissipation cover 600 and being suitable for defining the cooling cavity into a continuous curved flow channel. The flow channel can increase the flow path of the cooling medium so that the cooling medium stays in the end shell 300 for a longer time. One end of the cooling flow channel is connected to the medium inlet, and the other end is connected to the medium outlet. The cooling medium flowing into the cooling cavity from the medium inlet flows along a preset path and flows out from the medium outlet.

[0065] Further, the end surface of the first flange 321 in contact with the heat dissipation cover 600 is recessed inward to form a third connection hole 3211, and the third connection holes 3211 are multiple and are arranged at equal intervals along the circumference of the first flange 321. The end surface of the second flange 341 in contact with the heat dissipation cover 600 is recessed inward to form a fourth connection hole 3411, and the fourth connection holes 3411 are multiple and are arranged at equal intervals along the circumference of the second flange 341. The heat dissipation cover 600 is provided with a fifth connection hole 620 through the axial direction of the motor body 100, and the fifth connection hole 620 is coaxially provided with two circles to correspond to the third connection holes 3211 and the fourth connection holes 3411 one by one. The screw member can be installed in the fifth connection hole 620 and the third connection hole 3211, and the fifth connection hole 620 and the fourth connection hole 3411 from the end of the heat dissipation cover 600 away from the first flange 321, so as to achieve the fastening of the heat dissipation cover 600 and the first flange 321. Preferably, the third connection hole 3211 and the fourth connection hole 3411 are both blind holes, so as to prevent the third connection hole 3211 from communicating with the outside, thereby improving the explosion-proof performance of the second installation cavity 330. In addition, when the screw is fastened to the third connection hole 3211 and the fifth connection hole 620 and the fourth connection hole 3411 and the fifth connection hole 620, the cap of the screw does not protrude relative to the fifth connection hole 620, thereby ensuring that the stator 120 is reliably attached to the end surface of the heat dissipation cover 600, improving the heat dissipation, and making the stator 120 more stable after installation.

[0066] In addition, the heat dissipation cover 600 is provided with a sixth connection hole 630 along the axial direction of the motor body 100. There are multiple sixth connection holes 630, which are arranged at intervals along the circumferential direction of the heat dissipation cover 600. The sixth connection hole 630 is located between two circles of fifth connection holes 620. The stator 120 is provided with a seventh connection hole (not shown) corresponding to the sixth connection hole 630, and the two are also fastened by screws.

[0067] Furthermore, since the stator 120 will block the fifth connection hole 620 after being installed on the heat dissipation cover 600, during the installation process, the heat dissipation cover 600 is first installed on the end shell 300, and then the stator 120 is installed on the heat dissipation cover 600. However, by adopting the above method, the end of the heat dissipation cover 600 facing the cover body 310 is blocked by the cover body 310. Preferably, the cover body 310 is provided with a plurality of auxiliary holes 313 corresponding to the sixth connection hole 630 along the axial direction of the motor body 100, and the screw member can be installed between the sixth connection hole 630 and the seventh connection hole through the auxiliary hole 313 from the outside of the housing, thereby improving the convenience of assembly of the stator 120.

[0068] However, since the heat dissipation cover 600 is accommodated in the second installation cavity 330, the second installation cavity 330 communicates with the outside through the sixth connection hole 630 and the auxiliary hole 313. Although a threaded member is provided in the sixth connection hole 630, it is difficult to form a reliable explosion-proof joint surface with the sixth connection hole 630, and the explosion-proof performance is poor. Preferably, the explosion-proof housing includes a first plug 700 for blocking the auxiliary hole 313, and a stopper-type explosion-proof joint surface is formed between the first plug 700 and the cover body 310 to improve the explosion-proof performance of the end shell 300.

[0069] Specifically, the first plug 700 includes a first plug body 710 and a first cover 720. The first plug body 710 is a cylindrical structure. The first cover 720 is connected to one end of the first plug body 710 and protrudes relative to its outer edge. The first plug body 710 is inserted into the auxiliary hole 313, and the first cover 720 covers the outer end of the auxiliary hole 313. The outer edge of the first plug body 710 and the inner edge of the auxiliary hole 313 are in close contact, and the end face of the first cover 720 and the end face of the cover body 310 facing away from the heat dissipation cover 600 are in close contact. Preferably, the first plug body 710 is a threaded column, which is threadedly connected to the auxiliary hole 313 to facilitate the installation of the first plug 700 and improve the tightness of its connection with the cover body 310.

[0070] Further, return Figure 1 and Figure 2 As shown, the casing body 200 is provided with a first wiring opening 230 in the radial direction of the motor body 100, and the first wiring opening 230 is communicated with the first installation cavity 210. The explosion-proof casing also includes a junction box 800 arranged outside the casing body 200, and the junction box 800 is connected to the first wiring opening 230. The first cylinder 320 is provided with a second wiring opening 322 at the position corresponding to the first wiring opening 230. The second installation cavity 330 and the junction box 800 are communicated through the first wiring opening 230 and the second wiring opening 322 to facilitate the wiring of the motor body 100.

[0071] Specifically, a flange portion 240 is provided on the peripheral side of the casing body 200, and the flange portion 240 corresponds to the first wiring port 230, and the junction box 800 is in close contact with the flange portion 240, and the two are fastened by screws. The explosion-proof casing of the present invention adopts a three-shell structure, so that after the junction box 800 is installed on the casing body 200, it can avoid forming a T-shaped joint surface between the junction box 800 and the casing body 200, thereby improving the explosion-proof performance between the junction box 800 and the casing body 200. Since the casing body 200 is provided with a first cylinder 320, it can effectively isolate the junction box 800 and the motor body 100, so that there is no need to set a stopper-type explosion-proof joint surface between the flange portion 240 and the junction box 800, but only a plane-type explosion-proof joint surface is required, so that the connection structure between the flange portion 240 and the junction box 800 is simpler, and molding and installation are more convenient.

[0072] Preferably, the contact parts of the casing body 200 and the junction box 800 are both textured surfaces, and the contact parts are coated with sealant; and / or a seal made of elastic material can be arranged between the two to improve the sealing between the two, and the seal includes but is not limited to a rubber ring, a silicone ring, etc.

[0073] Further, refer to Figures 5 to 7 As shown, the junction box 800 includes a box body 810, a partition 820, a first terminal 830 and a second terminal 840. A lead cavity is formed in the box body 810, and the partition 820 is arranged in the lead cavity and is suitable for dividing the lead cavity into a first cavity 811 and a second cavity 812 that are independent of each other. The first cavity 811 is provided with a third wiring opening 813 connected to the first wiring opening 230. The first terminal 830 is arranged on the partition 820, and the two ends are respectively located in the first cavity 811 and the second cavity 812. There are multiple first terminals 830 and they are arranged side by side. The second terminal 840 is arranged on the box body 810, one end of which extends into the second cavity 812, and the other end is located outside. There are multiple second terminals 840 and they are arranged side by side. The second terminals 840 correspond to the first terminals 830 one by one. The first terminals 830 and the second terminals 840 are both used to connect the leads, and the present invention will not be repeated here.

[0074] By adopting the above structure, the lead wires in the junction box 800 are of segmented structure, and the first terminal 830 and the second terminal 840 are separated by the partition plate 820, thereby effectively improving the explosion-proof performance of the junction box 800.

[0075] Further, the opening direction of the third wiring port 813 is parallel to the plate surface of the partition 820, the axial direction of the first terminal 830 is perpendicular to the plate surface of the partition 820, and the axial direction of the second terminal 840 is perpendicular to the axial direction of the first terminal 830, thereby improving the explosion-proof performance. The partition 820 can be integrally formed with the box body 810 or assembled after being formed in parts. In this embodiment, it is preferred to adopt integral forming to facilitate assembly and improve the connection strength. The partition 820 is provided with a plurality of threaded holes in a direction perpendicular to its plate surface, and the first terminal 830 corresponds to the threaded holes one by one and is threadedly connected with the threaded holes. Preferably, the box body 810 is open on both sides of the plate surface direction of the vertical partition 820, and the open side is covered with a connecting plate 850, and the connecting plate 850 and the box body 810 are fastened by a screw. With the above structure, the operator can install the first terminal 830 through the open side, and the assembly is more convenient. Benefiting from the barrier effect of the first cylinder 320 , only a planar explosion-proof joint surface needs to be formed between the connecting plate 850 and the box body 810 , thereby simplifying the structure of the box body 810 and the connecting plate 850 .

[0076] Furthermore, since one end of the second terminal 840 is located outside the box body 810 and the other end is located inside the box body 810, in order to ensure the explosion-proof effect of the junction box 800, the second terminal 840 usually needs to adopt an explosion-proof terminal. However, the explosion-proof terminal is large in size, which is not conducive to reducing the overall size of the junction box 800 and has poor spatial adaptability.

[0077] As a preferred embodiment, the box body 810 is provided with an opening adapted to the second terminal 840, the two ends of the opening are respectively connected to the outside and the second cavity 812, the second terminal 840 is inserted into the opening, and the outer edge of the second terminal 840 is welded to the outer wall of the box body 810 through a welding structure. In this case, the second terminal 840 can adopt a common terminal structure, thereby effectively reducing the overall size of the junction box 800.

[0078] However, since the second terminals 840 are arranged side by side, the spacing between adjacent second terminals 840 is small, and welding is very inconvenient. As a more preferred embodiment, the junction box 800 includes an auxiliary plate 860 welded between the box body 810 and the second terminals 840, and the auxiliary plate 860 is provided with a mounting hole 861 for the second terminals 840 to pass through, and the mounting hole 861 corresponds to the second terminals 840 one by one, and the box body 810 is provided with a avoidance opening 814 at the position corresponding to the auxiliary plate 860, and the avoidance opening 814 is communicated with the second cavity 812 and the mounting hole 861 respectively.

[0079] With the above structure, when installing the second terminal 840, the second terminal 840 can be first inserted into the mounting hole 861 from one end thereof, and then the welding structure welds the outer edge of the second terminal 840 to the inner wall of the mounting hole 861 through the other end of the mounting hole 861, thereby avoiding the adjacent second terminal 840 from obstructing the welding operation.

[0080] Specifically, in this embodiment, the second terminal 840 includes a sleeve 841 and a terminal body 842 installed in the sleeve 841. The outer diameter of the sleeve 841 is larger than the inner diameter of the mounting hole 861. One end of the terminal body 842 protrudes from the sleeve 841 to connect with the lead outside the box body 810, and the other end does not protrude relative to the sleeve 841 to connect with the lead inside the box body 810. The other end of the sleeve 841 abuts against one end of the mounting hole 861, and is provided with a welding portion 8411 extending into the mounting hole 861. The outer contour of the welding portion 8411 is adapted to the inner contour of the mounting hole 861, and the welding portion 8411 is a through structure in the axial direction of the second terminal 840 for the lead to pass through.

[0081] During installation, the welding portion 8411 of the second terminal 840 can be inserted into the mounting hole 861 first, and the end of the sleeve 841 can be abutted against one end of the mounting hole 861 to achieve axial positioning of the second terminal 840. The welding structure can then be extended into the mounting hole 861 from the other end of the mounting hole 861 to weld the outer edge of the welding portion 8411 to the inner edge of the mounting hole 861. The above steps are repeated until all the second terminals 840 are welded. The auxiliary plate 860 is then placed on the box body 810, and the auxiliary plate 860 is welded to the box body 810 through the welding structure.

[0082] Furthermore, the box body 810 is provided with an air hole 815, the inner end of the air hole 815 is communicated with the first cavity 811, and the outer end is communicated with the outside. The junction box 800 also includes an air valve 870, which is connected to the outer end of the air hole 815. The air valve 870 can balance the air pressure inside and outside the explosion-proof casing to effectively protect the motor.

[0083] In one embodiment, the vent valve 870 may adopt an explosion-proof valve body structure, however, the size of the explosion-proof valve body is usually large, which is not conducive to the development trend of motor miniaturization. Preferably, in this embodiment, the vent valve 870 adopts a conventional valve body structure, and the junction box 800 also includes a second plug 880 and a fastener 890. The second plug 880 is sealed in the vent hole 815 from the inner end of the vent hole 815, and the fastener 890 is suitable for fixing the second plug 880 to the first cavity 811. The second plug 880 includes a second plug body 881 and a second cover 882 connected to the second plug body 881. The second plug body 881 is inserted into the vent hole 815, and the second cover 882 is covered on the inner end of the vent hole 815. The fastener 890 is connected between the second cover 882 and the inner wall of the first cavity 811 to fix the second cover 882 to the first cavity 811.

[0084] There is an explosion-proof gap between the second plug body 881 and the vent hole 815, and there is an explosion-proof gap between the second cover 882 and the inner wall of the first cavity 811, and the vent valve 870 is adapted to be connected to the first cavity 811 through the above-mentioned explosion-proof gap. When the air pressure inside the explosion-proof housing is too high, the pressure is transmitted to the vent valve 870 through the explosion-proof gap, so that the vent valve 870 can balance the pressure inside the explosion-proof housing with the outside in time.

[0085] In addition, by providing the second plug 880, an explosion-proof joint surface is formed between the second plug body 881 and the air vent 815, and an explosion-proof joint surface is formed between the second cover portion 882 and the inner wall of the first cavity portion 811. When an explosion occurs inside the explosion-proof casing, the explosion-proof joint surface can effectively block the flame, and the flame needs to pass through a longer path to be transmitted to the outside of the explosion-proof casing. Therefore, the flame can be effectively prevented from being transmitted to the outside of the explosion-proof casing, thereby playing an explosion-proof role.

[0086] Specifically, the second plug body 881 is a cylinder, and the second plug body 881 and the air hole 815 have a clearance fit, and the clearance is preferably greater than zero. The second cover 882 is connected to one end of the second plug body 881 and protrudes relative to its outer edge. The fastener 890 is specifically a threaded member, which is threadedly connected between the second cover 882 and the inner wall of the first cavity 811 to achieve the fastening of the second plug 880, and when the second cover 882 is fixed to the first cavity 811, the second plug body 881 is coaxial with the air hole 815, and there is a clearance greater than zero between the end of the second plug body 881 away from the second cover 882 and the air valve 870, ensuring that the pressure inside the explosion-proof casing is timely and reliably transmitted to the air valve 870.

[0087] In one embodiment, the fastener 890 can be in a loose state so that a gap is formed between the second cover 882 and the first cavity 811. However, in the above manner, the reliability of the second plug 880 after installation is relatively poor. Preferably, in this embodiment, a spring washer 891 is provided between the second cover 882 and the inner wall of the first cavity 811 so that a gap greater than zero is reliably formed between the second cover 882 and the inner wall of the first cavity 811, and the fastener 890 can be rotated to a tight fit state, and the fastening between the second plug 880 and the first cavity 811 is better. In this embodiment, the spring washer 891 is preferably an O-ring sleeved outside the fastener 890 to improve its position reliability and avoid detaching from the second cover 882. There are multiple fasteners 890, and they are evenly distributed along the circumference of the second cover 882, and the spring washer 891 corresponds to the fastener 890 one by one.

[0088] 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 used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. An axial magnetic field motor, characterized in that: include: Motor body (100); A casing body (200) is formed with a first installation cavity (210), and both ends of the casing body (200) in the axial direction of the motor body (100) are open ends (220) that communicate with the first installation cavity (210); Two end shells (300) are provided at different opening ends (220) respectively. The end shells (300) include a cover body (310) and a first cylinder body (320) connected to the cover body (310). The cover body (310) covers the outside of the opening end (220). The first cylinder body (320) extends from the opening end (220) into the first installation cavity (210). The two first cylinders (320) extend toward each other and are closely adjacent to each other so as to cooperate to form a second installation cavity (330) for accommodating the motor body (100), the cover body (310) and the end surface of the opening end (220) are in close contact, and the outer edge of the first cylinder (320) is in close contact with the inner edge of the first installation cavity (210).

2. The axial magnetic field motor according to claim 1, characterized in that: There is a gap between the two opposite ends of the first cylinders (320) or they fit together in the extension direction of the first cylinder (320).

3. The axial magnetic field motor according to claim 1, characterized in that: The motor body (100) comprises: A rotating shaft (110) rotatably mounted on the cover body (310) and at least partially located in the second mounting cavity (330); There are two stators (120), which are respectively fixedly accommodated in different first cylinders (320); a rotor (130) fixedly connected to the rotating shaft (110), the rotor (130) being received in the second mounting cavity (330) and being located between the two stators (120); The rotating shaft (110), the stator (120) and the rotor (130) are coaxially arranged, and their axial direction is the axial direction of the motor body (100).

4. The axial magnetic field motor according to claim 3, characterized in that: When the stator (120) is accommodated and installed in the first cylinder (320), the axial height of the first cylinder (320) in the motor body (100) is greater than the axial height of the stator (120).

5. The axial magnetic field motor according to claim 3, characterized in that: The axial magnetic field motor also includes: A bearing (400) is sleeved outside the rotating shaft (110), and the number of the bearings (400) is at least two and they are arranged at two ends of the rotor (130); A limiting sleeve (500), which is fixedly arranged outside the rotating shaft (110); there are at least two limiting sleeves (500), which are arranged at both ends of the rotor (130); the limiting sleeves (500) are located between the bearing (400) and the rotor (130), and are close to the end of the rotor (130); The end shell (300) comprises a second cylinder (340) connected to the cover body (310) and accommodated in the first cylinder (320); the stator (120) is located between the first cylinder (320) and the second cylinder (340); the two second cylinders (340) extend toward each other to the ends of the rotor (130); the bearing (400) and the limiting sleeve (500) at one end of the rotor (130) are accommodated in one of the second cylinders (340); and the bearing (400) and the limiting sleeve (500) at the other end are accommodated in the other of the second cylinders (340).

6. The axial magnetic field motor according to claim 1, characterized in that: The axial magnetic field motor comprises a heat dissipation cover (600) fixedly accommodated in the first cylinder (320); the stator (120) is closely adjacent to one end of the heat dissipation cover (600) facing away from the cover body (310); the heat dissipation cover (600), the cover body (310) and the first cylinder (320) cooperate to form a cooling cavity for the circulation of a cooling medium; a plurality of drainage ribs (610) are protruding from one end of the heat dissipation cover (600) facing the cover body (310); the drainage ribs (610) are suitable for guiding the flow of the cooling medium.

7. The axial magnetic field motor according to any one of claims 1 to 6, characterized in that: The casing body (200) is provided with a first wiring opening (230) in the radial direction of the motor body (100), and the first wiring opening (230) is communicated with the first installation cavity (210). The axial magnetic field motor also includes a terminal box (800) arranged on the casing body (200) and connected to the first wiring opening (230), and the first cylinder (320) is provided with a second wiring opening (322) at a position corresponding to the first wiring opening (230).

8. The axial magnetic field motor according to claim 7, characterized in that: The contact portions of the housing body (200) and the end housing (300) are both textured surfaces, and the contact portions are coated with sealant; and / or the contact portions of the housing body (200) and the junction box (800) are both textured surfaces, and the contact portions are coated with sealant.

9. The axial magnetic field motor according to claim 7, characterized in that: The junction box (800) comprises: A box body (810) is formed with a lead cavity; a partition (820) disposed in the lead-in cavity and adapted to separate the lead-in cavity into a first cavity portion (811) and a second cavity portion (812) that are independent of each other, wherein the first cavity portion (811) is provided with a third routing opening (813) connected to the first routing opening (230); A plurality of first connecting posts (830) are arranged on the partition (820), and two ends of the first connecting posts are respectively located in the first cavity (811) and the second cavity (812); A plurality of second connecting posts (840) are arranged on the box body (810), one end of which extends into the second cavity (812) and the other end is located outside.

10. The axial magnetic field motor according to claim 9, characterized in that: The junction box (800) includes an auxiliary plate (860) welded between the box body (810) and the second terminal (840); the auxiliary plate (860) is provided with a mounting hole (861) for the second terminal (840) to pass through; the box body (810) is provided with an escape opening (814) at a position corresponding to the auxiliary plate (860); the escape opening (814) is respectively communicated with the second cavity (812) and the mounting hole (861).

11. The axial magnetic field motor according to claim 9, characterized in that: The box body (810) is provided with a vent hole (815) communicating with the first cavity (811), and the junction box (800) comprises: A vent valve (870) connected to the outer end of the vent hole (815); The second plug (880) comprises a second plug body (881) and a second cover portion (882) connected to the second plug body (881), wherein the second plug body (881) is inserted into the air vent (815), and the second cover portion (882) covers the inner end of the air vent (815); A fastener (890) adapted to fasten the second cover portion (882) to the first cavity portion (811); There is an explosion-proof gap between the second cover portion (882) and the inner wall of the first cavity portion (811), there is an explosion-proof gap between the second plug body (881) and the air hole (815), and the air valve (870) is suitable for being connected to the first cavity portion (811) through the explosion-proof gap.

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