Explosion-proof generator

Abstract

The invention discloses an explosion-proof generator, which comprises an explosion-proof generator body, an explosion-proof casing, an explosion-proof front cover and an explosion-proof rear cover, and is characterized in that the explosion-proof front cover and the explosion-proof rear cover are respectively mounted at two ends of the explosion-proof casing and form a closed cavity with the explosion-proof casing; the explosion-proof generator body is located in the closed cavity, and a rotor shaft of the explosion-proof generator body penetrates out of the explosion-proof front cover; a fan is arranged on one side, far away from the explosion-proof generator body, of the explosion-proof front cover; the fan is fixedly connected with the rotor shaft; a wind scooper 6 is further arranged on the side, away from the explosion-proof front cover, of the fan and used for guiding airflow from the explosion-proof front cover to the explosion-proof machine shell. The explosion-proof generator provided by the invention has a good protection effect and a heat dissipation effect, is not easy to overheat in a working process, can stably work for a long time, is long in service life and good in durability, and can stably work for a long time in areas such as an explosive gas area 1 and a dust area 21.

Description

Technical Field

[0001] The present application relates to the technical field of explosion-proof equipment, and in particular to an explosion-proof motor. Background Art

[0002] Dust refers to solid tiny particles suspended in the air. The dust explosion prevention standard is set to protect the safety of equipment and personnel in industrial production environments and prevent fire and explosion accidents caused by dust. According to the characteristics of different industries and working environments, the dust explosion prevention area is divided into Zone 20, Zone 21 and Zone 22. Similarly, according to the frequency and duration of the occurrence of explosive gas mixtures, explosive gases are divided into Zone 0, Zone 1 and Zone 2.

[0003] For explosion-proof internal combustion forklifts used in explosive gas zone 1 and dust zone 21 environments, all vehicle parts must meet explosion-proof requirements. Among them, the explosion-proof motor, as an important explosion-proof component, is directly connected to the engine. The engine drives the electronic rotor to rotate at high speed, converting mechanical energy into electrical energy, and then supplying power to the vehicle's electrical system. During operation, the explosion-proof motor must meet the following conditions to meet the application requirements of explosion-proof places: first, no electrical sparks can be generated, and second, the temperature of the outer shell in contact with the air must not exceed the explosion-proof requirements (≤135°C). In addition, in order to maintain the durability of the forklift, the generator itself is also required to have a high strength. Summary of the invention

[0004] In order to solve the above-mentioned technical problems, the first purpose of the present invention is to provide an explosion-proof motor; the explosion-proof motor provided by the present application has good protection effect and heat dissipation effect, is not easy to overheat during the working process, can work stably for a long time, has a long service life and good durability, and can work stably for a long time in explosive gas zone 1, dust zone 21 and other areas.

[0005] The technical solution provided by the present invention is as follows: An explosion-proof motor comprises an explosion-proof motor body, a flameproof casing, a flameproof front cover and a flameproof rear cover. The flameproof front cover and the flameproof rear cover are respectively installed at two ends of the flameproof casing and form a closed cavity with the flameproof casing; The explosion-proof motor body is located in the closed cavity, and the rotor shaft of the explosion-proof motor body passes through the flameproof front cover; A fan is provided on a side of the flameproof front cover away from the explosion-proof motor body, and the fan is fixedly connected to the rotor shaft; An air guide cover is also provided on the side of the fan away from the flameproof front cover, for guiding the airflow from the flameproof front cover to the flameproof casing.

[0006] Preferably, the air guide cover comprises a cylindrical section and an annular plate, wherein the annular plate is connected to one end of the cylindrical section and extends in the radial direction of the cylindrical section; The cylindrical section extends from the outer periphery of the flameproof front cover to the outer periphery of the flameproof casing, and there is a gap between the flameproof front cover and the flameproof casing for air flow; The annular plate is located on the outer side of the end surface of the flameproof front cover.

[0007] Preferably, the outer walls of the flameproof casing and the flameproof front cover are provided with casing heat dissipation grooves and front cover heat dissipation grooves respectively. The heat dissipation slot of the casing extends in the axial direction; The front cover heat dissipation groove extends from the end surface of the flameproof front cover to the outer periphery, and extends radially at the end surface of the flameproof front cover and extends axially at the outer periphery of the flameproof front cover.

[0008] Preferably, the number of the heat dissipation slots in the housing and the heat dissipation slots in the front cover are 20-60 respectively; The positions of the depression and the protrusion between the heat dissipation slot of the case and the heat dissipation slot of the front cover correspond to each other.

[0009] Preferably, a first assembly contact surface is provided between the flameproof casing and the flameproof front cover, the length of the first assembly contact surface along the axial direction is greater than 9.5 mm, and a first sealing ring is also provided between the flameproof casing and the flameproof front cover; A second assembly contact surface is provided between the flameproof casing and the flameproof rear cover, the axial length of the second assembly contact surface is greater than 9.5 mm, and a second sealing ring is provided between the flameproof casing and the flameproof rear cover.

[0010] Preferably, the rotor of the explosion-proof motor body is fixedly connected to the rotor shaft, and a flameproof copper ring is provided between the rotor and the flameproof front cover. The flameproof copper ring is closely attached to the rotor shaft and has a third assembly contact surface with the flameproof front cover. The length of the third assembly contact surface along the axial direction is greater than 12.5 mm.

[0011] Preferably, a first bearing is provided at one end of the rotor shaft close to the flameproof front cover, and a third sealing ring is provided between the first bearing and the flameproof front cover; A second bearing is arranged at one end of the rotor shaft close to the flameproof rear cover.

[0012] Preferably, the flameproof rear cover is provided with a positive electrode outlet port, a negative electrode outlet port and a temperature detection port.

[0013] Preferably, the flameproof casing, the flameproof front cover and the flameproof rear cover are made of aluminum alloy.

[0014] Preferably, the flameproof casing is provided with at least two protrusions, and the protrusions are provided with mounting holes.

[0015] The present application provides an explosion-proof motor, comprising an explosion-proof motor body, a flameproof casing, a flameproof front cover and a flameproof rear cover, wherein the flameproof front cover and the flameproof rear cover are respectively installed at both ends of the flameproof casing and form a closed cavity with the flameproof casing; the explosion-proof motor body is located in the closed cavity, and the rotor shaft of the explosion-proof motor body passes through the flameproof front cover, which not only ensures that the rotor shaft can be connected to the transmission structure such as a pulley to realize the normal operation of the generator body, but also isolates the components in the explosion-proof motor body that may generate electrical sparks from the outside air, thereby achieving the effect of "isolating explosion". In addition, in the present application, a fan is provided on the side of the flameproof front cover away from the explosion-proof motor body, and the fan is fixedly connected to the rotor shaft, rotates with the motor rotor, and generates air volume for heat dissipation; an air guide cover is also provided on the side of the fan away from the flameproof front cover, which is used to guide the airflow from the flameproof front cover to the flameproof casing, change the airflow direction, and guide the air volume generated by the fan from the flameproof front cover to the flameproof casing, forming an active air-cooled heat dissipation system, greatly enhancing the heat dissipation effect of the explosion-proof motor, and quickly dissipating the heat of the explosion-proof motor to the external environment. In addition, the air guide cover can also provide a certain degree of protection for the fan.

[0016] The explosion-proof motor provided by the present application has electrical components that may generate electrical sparks, such as the excitation coil, stator coil, regulator, rectifier, etc., which are encapsulated in a closed cavity and isolated from the outside air, and has a good protection effect; at the same time, it has a good heat dissipation effect, is not easy to overheat during the working process, can work stably for a long time, has a long service life, and good durability, and can work stably for a long time in areas such as explosive gas zone 1 and dust zone 21. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a structural schematic diagram of an explosion-proof motor in an embodiment of the present invention; Figure 2 A perspective structural diagram of an explosion-proof motor in an embodiment of the present invention (showing the relationship between the protective cover and the structure below); Figure 3 It is a schematic diagram of the structure of the explosion-proof motor from another angle in an embodiment of the present invention; Figure 4 A cross-sectional schematic diagram of an explosion-proof motor in an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of the flameproof front cover in an embodiment of the present invention; Figure 6 It is a schematic diagram of the structure of the flameproof casing in an embodiment of the present invention; Figure 7 Another perspective structural diagram of the flameproof casing in the embodiment of the present invention; Figure 8 It is a structural schematic diagram of the flameproof rear cover in an embodiment of the present invention; Fig. 9 A schematic diagram of the structure of a fan in an embodiment of the present invention; Fig.10 Schematic diagram of the structure of the air guide cover in an embodiment of the present invention; Figure markings: 1-explosion-proof motor body; 101-rotor shaft; 102-rotor; 103-first bearing; 104-second bearing; 2-flameproof casing; 201-casing heat dissipation groove; 202-first assembly contact surface; 203-second assembly contact surface; 204-mounting hole; 3-flameproof front cover; 301-front cover heat dissipation groove; 4-flameproof rear cover; 401-positive electrode outlet port; 402-negative electrode outlet port; 403-temperature detection port; 5-fan; 6-wind guide cover; 601-cylinder section; 602-annular plate; 7-first sealing ring; 8-second sealing ring; 9-flameproof copper ring; 901-third assembly contact surface; 10-third sealing ring. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0020] It should be noted that when an element is referred to as being "fixed on" or "set on" another element, it can be directly on the other element or indirectly set on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0021] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application 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 should not be understood as a limitation on the present application.

[0022] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" and "several" mean two or more, unless otherwise clearly and specifically defined.

[0023] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which this application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the effects and purposes that can be achieved by this application.

[0024] As shown in the figure, an embodiment of the present invention provides an explosion-proof motor, comprising an explosion-proof motor body 1, a flameproof casing 2, a flameproof front cover 3 and a flameproof rear cover 4. The flameproof front cover 3 and the flameproof rear cover 4 are respectively installed at the two ends of the flameproof casing 2, and form a closed cavity with the flameproof casing 2; The explosion-proof motor body 1 is located in a closed cavity, and the rotor shaft 101 of the explosion-proof motor body 1 passes through the flameproof front cover 3; A fan 5 is provided on a side of the flameproof front cover 3 away from the explosion-proof motor body 1, and the fan 5 is fixedly connected to the rotor shaft 101; A wind guide cover 6 is also provided on a side of the fan 5 away from the flameproof front cover 3 , for guiding the airflow from the flameproof front cover 3 to the flameproof casing 2 .

[0025] The present application provides an explosion-proof motor, comprising an explosion-proof motor body 1, a flameproof casing 2, a flameproof front cover 3 and a flameproof rear cover 4, wherein the flameproof front cover 3 and the flameproof rear cover 4 are respectively mounted at both ends of the flameproof casing 2, and form a closed cavity with the flameproof casing 2; the explosion-proof motor body 1 is located in the closed cavity, and a rotor shaft 101 of the explosion-proof motor body 1 passes through the flameproof front cover 3, which not only ensures that the rotor shaft 101 can be dynamically connected to a transmission structure such as a pulley to realize the normal operation of the explosion-proof motor body 1, but also isolates the components in the explosion-proof motor body 1 that may generate electrical sparks from the outside air, thereby achieving the effect of "isolating explosion". Moreover, in the present application, a fan 5 is provided on the side of the explosion-proof front cover 3 away from the explosion-proof motor body 1, and the fan 5 is fixedly connected to the rotor shaft 101, rotates with the generator rotor, and generates air volume for heat dissipation; a wind guide 6 is also provided on the side of the fan 5 away from the explosion-proof front cover 3, which is used to guide the airflow from the explosion-proof front cover 3 to the explosion-proof casing 2, change the airflow direction, and guide the air volume generated by the fan 5 from the explosion-proof front cover 3 to the explosion-proof casing 2, forming an active air-cooled heat dissipation system, greatly enhancing the heat dissipation effect of the explosion-proof motor, and quickly dissipating the heat of the explosion-proof motor to the external environment. In addition, the wind guide 6 can also play a certain protective role for the fan 5.

[0026] The explosion-proof motor provided by the present application has electrical components that may generate electrical sparks, such as the excitation coil, stator coil, regulator, rectifier, etc., in the explosion-proof motor body 1, which are all encapsulated in a closed cavity and isolated from the outside air, and has a good protection effect; at the same time, it has a good heat dissipation effect, is not easy to overheat during the working process, can work stably for a long time, has a long service life, and good durability, and can work stably for a long time in areas such as explosive gas zone 1 and dust zone 21.

[0027] In the present application, the flameproof front cover 3 and the flameproof rear cover 4 are preferably fastened to the flameproof casing 2 by bolts to maintain the sealing of the sealed cavity. Similarly, the air guide 6 can also be fixed to the flameproof casing 2 or the flameproof front cover 3 by bolts.

[0028] Preferably, the air guide cover 6 includes a cylindrical section 601 and an annular plate 602, wherein the annular plate 602 is connected to one end of the cylindrical section 601 and extends along the radial direction of the cylindrical section 601; The cylindrical section 601 extends from the outer periphery of the flameproof front cover 3 to the outer periphery of the flameproof casing 2, and there is a gap between the flameproof front cover 3 and the flameproof casing 2 for air flow; The annular plate 602 is located outside the end surface of the flameproof front cover 3 .

[0029] Preferably, the air guide cover 6 includes a cylindrical section 601 and an annular plate 602, the annular plate 602 is connected to one end of the cylindrical section 601, and extends along the radial direction of the cylindrical section 601 to form a structure with an angle; the cylindrical section 601 extends from the outer periphery of the flameproof front cover 3 to the outer periphery of the flameproof casing 2, and there is a gap between the flameproof front cover 3 and the flameproof casing 2 for air flow; the annular plate 602 is located on the outer side of the end face of the flameproof front cover 3, and the hole in the middle does not hinder the rotor shaft 101 from extending out and connecting related structures.

[0030] When the fan 5 is running, the air penetrates into the air guide cover 6 from the hole in the middle of the annular plate 602 and contacts the end face of the flameproof front cover 3. Then, the airflow is restricted by the inner wall of the annular plate 602 and the cylindrical section 601 as it continues to flow, and continues to flow close to the outer periphery of the flameproof front cover 3 until it reaches the outer periphery of the flameproof casing 2, taking away the heat of the flameproof front cover 3 and the flameproof casing 2, thereby achieving a better heat dissipation effect.

[0031] Preferably, the outer walls of the flameproof casing 2 and the flameproof front cover 3 are provided with casing heat dissipation grooves 201 and front cover heat dissipation grooves 301, respectively. The heat dissipation slot 201 of the casing extends in the axial direction; The front cover heat dissipation groove 301 extends from the end surface of the flameproof front cover 3 to the outer periphery, and extends radially at the end surface of the flameproof front cover 3 and extends axially at the outer periphery of the flameproof front cover 3 .

[0032] It is more preferred that the outer walls of the flameproof housing 2 and the flameproof front cover 3 are provided with heat dissipation grooves to increase the surface area to enhance the heat dissipation capacity, and the heat dissipation grooves can also serve as air ducts to guide the air volume transmission and further meet the heat dissipation requirements. In addition, the use of raw materials for the flameproof housing 2 and the flameproof front cover 3 can be reduced, making them lighter.

[0033] Specifically, the casing heat dissipation groove 201 of the flameproof casing 2 extends axially; and the front cover heat dissipation groove 301 of the flameproof front cover 3 includes an end face part and a peripheral part. The heat dissipation groove of the end face part diverges radially, and extends to the periphery and turns to extend axially.

[0034] The front cover heat dissipation groove 301 extends along the outer wall at the end surface and the periphery of the flameproof front cover 3 , and the raised and recessed areas correspond to each other to ensure smooth airflow.

[0035] Preferably, the number of the heat dissipation slots 201 of the housing and the heat dissipation slots 301 of the front cover are 20-60 respectively; The positions of the depression and the protrusion between the heat dissipation groove 201 of the housing and the heat dissipation groove 301 of the front cover correspond to each other.

[0036] More preferably, the number of the heat dissipation slots 201 of the housing and the heat dissipation slots 301 of the front cover are 20-60, more preferably 30-50, for example, 36 respectively.

[0037] When multiple heat dissipation grooves are set, the positions of the depressions and protrusions between the casing heat dissipation groove 201 and the front cover heat dissipation groove 301 correspond to each other, so that the airflow can flow smoothly from the end of the flameproof front cover 3 to the flameproof casing 2 along the guidance of the heat dissipation grooves, and will not be hindered by the different positions of the heat dissipation grooves.

[0038] Preferably, a first assembly contact surface 202 is provided between the flameproof casing 2 and the flameproof front cover 3, the axial length of the first assembly contact surface 202 is greater than 9.5 mm, and a first sealing ring 7 is further provided between the flameproof casing 2 and the flameproof front cover 3; A second assembly contact surface 203 is provided between the flameproof casing 2 and the flameproof rear cover 4 , the axial length of the second assembly contact surface 203 is greater than 9.5 mm, and a second sealing ring 8 is provided between the flameproof casing 2 and the flameproof rear cover 4 .

[0039] Preferably, there are a first assembly contact surface 202 and a second assembly contact surface 203 between the flameproof housing 2 and the flameproof front cover 3, and between the flameproof housing 2 and the flameproof rear cover 4, respectively, and the first assembly contact surface 202 and the second assembly contact surface 203 are circumferential contact surfaces, and their axial length is greater than 9.5 mm to meet the explosion-proof requirements. At the same time, a first sealing ring 7 is also provided between the flameproof housing 2 and the flameproof front cover 3, and a second sealing ring 8 is provided between the flameproof housing 2 and the flameproof rear cover 4 to ensure airtightness.

[0040] In addition, thermal conductive silicone grease may be filled in places where no assembly contact surface is formed inside the closed cavity, especially between the flameproof casing 2 and the flameproof front cover 3 and the flameproof rear cover 4.

[0041] Preferably, the rotor 102 of the explosion-proof motor body 1 is fixedly connected to the rotor shaft 101, and a flameproof copper ring 9 is provided between the rotor 102 and the flameproof front cover 3. The flameproof copper ring 9 is in close contact with the rotor shaft 101 and has a third assembly contact surface 901 with the flameproof front cover 3 . The length of the third assembly contact surface 901 along the axial direction is greater than 12.5 mm.

[0042] It is also preferred that the rotor 102 of the explosion-proof motor body 1 is fixedly connected to the rotor shaft 101, and a flameproof copper ring 9 is provided between the rotor 102 and the flameproof front cover 3. The flameproof copper ring 9 is close to the rotor shaft 101, and has a third assembly contact surface 901 with the flameproof front cover 3. The length of the third assembly contact surface 901 along the axial direction is greater than 12.5 mm to meet the explosion-proof requirements. The flameproof copper ring 9 rotates with the generator rotor, blocking the contact between the stator coil, excitation coil and other electronic components inside the generator and the external environment gas. At the same time, due to the characteristics of the copper material itself, wear will not generate mechanical sparks when the explosion-proof motor is abnormally operated, further improving the safety of the explosion-proof motor.

[0043] The explosion-proof motor body 1 used in this application is preferably a brushless generator with good stability and long maintenance cycle. The engine drives the rotor 102 of the explosion-proof motor body 1 to rotate at high speed through a pulley, and the excitation coil and the stator coil cut the magnetic flux lines to convert mechanical energy into electrical energy; the rectifier converts AC power into DC power; the regulator stabilizes the voltage of the explosion-proof motor so that it remains in a certain voltage range at different speeds. The above-mentioned excitation coil, stator coil, rectifier and regulator are all located in a closed space surrounded by the flameproof casing 2, the flameproof front cover 3 and the flameproof rear cover 4.

[0044] Preferably, a first bearing 103 is provided at one end of the rotor shaft 101 close to the flameproof front cover 3, and a third sealing ring 10 is further provided between the first bearing 103 and the flameproof front cover 3; A second bearing 104 is provided at one end of the rotor shaft 101 close to the flameproof rear cover 4 .

[0045] More preferably, a first bearing 103 is provided at one end of the rotor shaft 101 close to the flameproof front cover 3, and a third sealing ring 10 is provided between the first bearing 103 and the flameproof front cover 3; a second bearing 104 is provided at one end of the rotor shaft 101 close to the flameproof rear cover 4. The first bearing 103 and the second bearing 104 can keep the rotor shaft 101 rotating stably, and the third sealing ring 10 is provided between the first bearing 103 and the flameproof front cover 3.

[0046] Preferably, the flameproof rear cover 4 is provided with a positive electrode outlet port 401 , a negative electrode outlet port 402 and a temperature detection port 403 .

[0047] Preferably, the flameproof rear cover 4 is provided with a positive outlet port 401, a negative outlet port 402 and a temperature detection port 403. The positive outlet port 401 and the negative outlet port 402 are respectively connected to the positive and negative outlet wire harnesses of the generator; and the temperature detection port 403 is used to set a temperature detection element to detect the temperature of the explosion-proof motor to prevent the temperature from exceeding the standard under abnormal conditions.

[0048] The ports can form threaded flameproof faces.

[0049] Preferably, the flameproof casing 2, the flameproof front cover 3 and the flameproof rear cover 4 are made of aluminum alloy.

[0050] The flameproof housing 2, flameproof front cover 3 and flameproof rear cover 4 are preferably made of aluminum alloy, which has higher strength and better thermal conductivity than iron materials, and can quickly conduct internal heat to the housing to ensure that the interior is not overheated. Precision casting aluminum technology is preferably used, with very little machining allowance.

[0051] The aluminum alloy preferably uses an aluminum alloy with a grade of ADC12.

[0052] Preferably, the flameproof casing 2 is provided with at least two protrusions, and each protrusion is provided with a mounting hole 204 .

[0053] Preferably, the flameproof housing 2 is provided with at least two protrusions, each of which is provided with a mounting hole 204 for mounting and fixing the entire explosion-proof motor.

[0054] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An explosion-proof motor, characterized in that: It comprises an explosion-proof motor body (1), a flameproof casing (2), a flameproof front cover (3) and a flameproof rear cover (4), The flameproof front cover (3) and the flameproof rear cover (4) are respectively mounted at two ends of the flameproof casing (2) and form a closed cavity together with the flameproof casing (2); The explosion-proof motor body (1) is located in a closed cavity, and the rotor shaft (101) of the explosion-proof motor body (1) passes through the flameproof front cover (3); A fan (5) is provided on a side of the flameproof front cover (3) away from the explosion-proof motor body (1), and the fan (5) is fixedly connected to the rotor shaft (101); A wind guide cover (6) is also provided on a side of the fan (5) away from the flameproof front cover (3) for guiding airflow from the flameproof front cover (3) to the flameproof casing (2).

2. The explosion-proof motor according to claim 1, characterized in that: The air guide cover (6) comprises a cylindrical section (601) and an annular plate (602), wherein the annular plate (602) is connected to one end of the cylindrical section (601) and extends in the radial direction of the cylindrical section (601); The cylindrical section (601) extends from the outer periphery of the flameproof front cover (3) to the outer periphery of the flameproof casing (2), and a gap exists between the flameproof front cover (3) and the flameproof casing (2) to allow airflow to flow; The annular plate (602) is located on the outer side of the end surface of the flameproof front cover (3).

3. The explosion-proof motor according to any one of claims 1-2, characterized in that: The outer walls of the flameproof casing (2) and the flameproof front cover (3) are respectively provided with a casing heat dissipation groove (201) and a front cover heat dissipation groove (301). The heat dissipation groove (201) of the casing extends in the axial direction; The front cover heat dissipation groove (301) extends from the end surface of the flameproof front cover (3) to the outer periphery, and extends radially on the end surface of the flameproof front cover (3), and extends axially on the outer periphery of the flameproof front cover (3).

4. The explosion-proof motor according to claim 3, characterized in that: The number of the heat dissipation slots (201) of the housing and the heat dissipation slots (301) of the front cover are 20-60 respectively; The positions of the depression and the protrusion between the heat dissipation groove (201) of the housing and the heat dissipation groove (301) of the front cover correspond to each other.

5. The explosion-proof motor according to claim 1, characterized in that: A first assembly contact surface (202) is provided between the flameproof casing (2) and the flameproof front cover (3); the first assembly contact surface (202) has an axial length greater than 9.5 mm, and a first sealing ring (7) is also provided between the flameproof casing (2) and the flameproof front cover (3); A second assembly contact surface (203) is provided between the flameproof casing (2) and the flameproof rear cover (4); the axial length of the second assembly contact surface (203) is greater than 9.5 mm; and a second sealing ring (8) is provided between the flameproof casing (2) and the flameproof rear cover (4).

6. The explosion-proof motor according to any one of claims 1 or 5, characterized in that: The rotor (102) of the explosion-proof motor body (1) is fixedly connected to the rotor shaft (101), and a flameproof copper ring (9) is provided between the rotor (102) and the flameproof front cover (3). The flameproof copper ring (9) is tightly attached to the rotor shaft (101) and has a third assembly contact surface (901) with the flameproof front cover (3); the length of the third assembly contact surface (901) along the axial direction is greater than 12.5 mm.

7. The explosion-proof motor according to claim 6, characterized in that: A first bearing (103) is provided at one end of the rotor shaft (101) close to the flameproof front cover (3), and a third sealing ring (10) is provided between the first bearing (103) and the flameproof front cover (3); A second bearing (104) is provided at one end of the rotor shaft (101) close to the flameproof rear cover (4).

8. The explosion-proof motor according to claim 1, characterized in that: The flameproof rear cover (4) is provided with a positive electrode outlet port (401), a negative electrode outlet port (402) and a temperature detection port (403).

9. The explosion-proof motor according to claim 1, characterized in that: The flameproof casing (2), the flameproof front cover (3) and the flameproof rear cover (4) are made of aluminum alloy.

10. The explosion-proof motor according to claim 1, characterized in that: The flameproof casing (2) is provided with at least two protrusions, and the protrusions are provided with mounting holes (204).

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