Explosion-proof three-phase asynchronous motor

Abstract

The invention discloses an explosion-proof three-phase asynchronous motor which comprises a shell, a front end cover, a rear end cover, a stator, a rotor and a rotating shaft, wherein the stator, the rotor and the rotating shaft are arranged inside the shell. The radiating fins are arranged on the outer wall of the machine shell, the reciprocating lead screw transmission mechanism is connected through the supporting frame, the cleaning plate is driven to do reciprocating motion along the guide rod, dust on the radiating fins is automatically removed through the arc-shaped brush plate, and efficient radiating is ensured. The cooling box is arranged below the machine shell, the cooling box and the machine shell are designed to share the wall, an internal cooling pipe conveys cooled gas into the machine shell through a gas circulation system, the temperature is forcibly reduced, combustible gas is dispersed, and the anti-explosion safety is improved. The eccentric wheel on the rotating shaft drives the piston pipe to reciprocate, one-way flow of gas is achieved in combination with the non-return cover plate structure, and active gas circulation is formed in cooperation with the annular gas inlet channel and the gas outlet hole. The motor integrates self-cleaning heat dissipation and gas circulation cooling functions, adapts to high-temperature, high-humidity and closed environments, effectively reduces energy consumption, prolongs the service life of the motor, and is suitable for flammable and explosive places.

Description

Technical Field

[0001] The invention belongs to the technical field of three-phase asynchronous motors, and in particular relates to an explosion-proof three-phase asynchronous motor. Background Art

[0002] As core power equipment in the industrial field, three-phase asynchronous motors are widely used in flammable and explosive environments, such as petrochemicals and coal mines. To ensure safe operation in such scenarios, explosion-proof three-phase asynchronous motors must have strict explosion-proof performance and efficient heat dissipation capabilities. Traditional explosion-proof motors often rely on external forced air cooling systems for heat dissipation, using external fans to accelerate air flow to reduce the surface temperature of the motor. However, this type of heat dissipation method has significant limitations: in high temperature, high humidity, or closed environments, the air heat conduction efficiency is reduced, and external airflow is restricted, resulting in a sharp drop in heat dissipation efficiency. The motor is prone to overheating and causing safety hazards.

[0003] Furthermore, after long-term operation, traditional heat dissipation structures can easily accumulate dust or foreign matter on the fins, further hindering heat dissipation and requiring frequent manual cleaning, increasing maintenance costs and the risk of downtime. Furthermore, high temperatures can generate flammable gases within the motor. Existing technologies lack active gas circulation and dispersion mechanisms, and localized gas accumulation can easily create explosion hazards. While some improved solutions have attempted to incorporate additional cooling devices, these suffer from complex structures, large footprints, and high energy consumption, making it difficult to achieve both efficient heat dissipation and explosion-proof safety.

[0004] Therefore, there is an urgent need for a new type of explosion-proof three-phase asynchronous motor that can achieve self-cleaning heat dissipation and active gas circulation in harsh environments, fundamentally improving heat dissipation efficiency and explosion-proof capabilities while maintaining a compact structure and operational reliability. Summary of the Invention

[0005] The purpose of the present invention is to provide an explosion-proof three-phase asynchronous motor to solve the existing problems.

[0006] To solve the above technical problems, the present invention is achieved through the following technical solutions: The present invention is an explosion-proof three-phase asynchronous motor, comprising a casing, and a front cover and a rear cover respectively fixed to the front and rear ends of the casing by bolts. A stator, a rotor, and a rotating shaft are arranged inside the casing. One end of the rotating shaft passes through the inner wall of one side of the rear end cover and is connected to a centrifugal fan blade. The rotating shaft is rotatably connected to the rear end cover via a rear bearing. The other end of the rotating shaft passes through a side wall of the front end cover and is rotatably connected to the front end cover via a front bearing. The rotor is sleeved on the rotating shaft, the rotor is fixedly connected to the rotating shaft, and the stator is fixedly connected to the inner wall of the casing. The cam is provided with a plurality of heat dissipation fins on the circumferential side of the casing, and two support frames are fixed on the circumferential side of the casing, and the support frame includes an arc plate and support columns evenly fixed on the inner arc surface of the arc plate, and the support column is fixedly connected to the outer wall of the casing, and the middle part of the two arc plates is connected to a reciprocating screw that rotates together. One end of the reciprocating screw is fixed with a bevel gear A, and an avoidance cavity is provided inside the arc plate where the bevel gear A is located. The lower side of the bevel gear A is meshed with the bevel gear A, and the lower surface of the bevel gear A is fixed with a transmission shaft. The transmission shaft passes through the support frame and extends into the interior of the casing. The lower end of the transmission shaft is fixed with a bevel gear B, and the circumferential side of the rotating shaft is fixed with a bevel gear B matching the bevel gear B. The two ends of the two arc plates are commonly connected to a guide rod, and the reciprocating screw and the two guide rods are commonly provided with a cleaning plate, and the cleaning plate is threadedly matched with the reciprocating screw, and the cleaning plate is slidably matched with the guide rod; a movable groove is provided on the inner arc surface of the cleaning plate, and two arc brush plates are fixed in the movable groove by an extrusion spring; The lower outer wall of the casing is symmetrically fixed with mounting feet, a cooling box is provided between the two mounting feet, the cooling box is fixedly connected to the casing, the cooling box and the casing share a side wall, a plurality of piston tubes are provided on the inner wall of the front end of the casing, a return spring is fixed on the step on the side surface of the piston tube, a piston rod is provided in the return spring, a hemispherical end is provided at one end of the piston rod, the return spring is fixedly connected to the lower surface of the hemispherical end, an annular air outlet channel is provided inside the casing where the piston tube is located, and the piston tube is connected to the annular air outlet channel; an annular air inlet channel is provided on one side of the annular air outlet channel, an air inlet hole is provided in the middle of the side surface of the piston tube, and the piston A circular ring is fixed to the lower end of the inner wall of the plug tube, and an annular groove is provided on the lower surface of the circular ring. A return spring is fixed in the annular groove, and a non-return cover is fixed to the lower end of the return spring. The shape and size of the non-return cover are adapted to the annular groove, and the non-return cover cooperates with the annular groove. A cooling pipe is provided in the cooling box, one end of the cooling pipe is connected to the annular air outlet channel, and the other end of the cooling pipe is connected to the rear end of the casing. An air outlet pipe is connected to the middle of the cooling pipe, and the free end of the air outlet pipe is connected to the annular air inlet channel. A number of air outlet holes are provided on the inner wall of the casing, and the air outlet holes are connected to the annular air inlet channel. An eccentric wheel adapted to the hemispherical end head is fixed to the circumferential side of the rotating shaft.

[0007] Furthermore, the front end bearing of the casing is provided with several mounting blocks, a surface of the mounting block is provided with a threaded hole, a surface of the front end cover is provided with a mounting hole corresponding to the mounting block, and the bolt A passes through the mounting hole and is threadedly connected to the threaded hole of the mounting block.

[0008] Furthermore, an annular slot is provided on the rear end face of the casing, an annular plug is provided on the inner wall of the rear end cover, a fixing hole is provided on the peripheral side of the rear end cover, and a fixing through hole corresponding to the fixing hole is provided on the peripheral side of the rear end of the casing, and the bolt B passes through the fixing hole and the fixing through hole and is threadedly fixed to the annular plug.

[0009] Furthermore, the shape and size of the arc-shaped brush plate are adapted to the movable groove, the arc-shaped brush plate and the movable groove cooperate with each other, the shape and size of the arc-shaped brush plate are adapted to the heat dissipation fins, and the bristles of the arc-shaped brush plate are against the heat dissipation fins.

[0010] Furthermore, the shape and size of the piston tube are adapted to the piston rod, and the piston tube and the piston rod are nested with each other.

[0011] Furthermore, the shape and size of the bevel gear A are adapted to the bevel gear A, and the bevel gear A and the bevel gear A cooperate with each other.

[0012] Furthermore, the shape and size of the bevel gear B are adapted to the bevel gear B, and the bevel gear B and the bevel gear B cooperate with each other.

[0013] Furthermore, the shape and size of the annular slot are adapted to the annular insert block, and the annular slot and the annular insert block are plugged into each other.

[0014] Furthermore, a plurality of heat dissipation holes are provided on one end surface of the rear end cover, and a plurality of reinforcing ribs are provided on the mounting feet.

[0015] Furthermore, the front end face and the rear end face of the cooling box are respectively connected with a coolant inlet pipe and a coolant outlet pipe, and valves are provided on the surrounding side surfaces of the coolant inlet pipe and the coolant outlet pipe, and the coolant inlet pipe and the coolant outlet pipe are connected with the cooling equipment.

[0016] The present invention has the following beneficial effects: 1. Efficient heat dissipation and self-cleaning: The arc-shaped brush plate driven by the reciprocating screw automatically cleans the heat dissipation fins to prevent dust accumulation from affecting the heat dissipation efficiency; combined with the cooling box and gas circulation system, the inside of the casing is forced to cool, effectively reducing the operating temperature of the motor.

[0017] 2. Enhanced explosion-proof safety: The cooled gas disperses the explosive gas in the casing through the annular air inlet channel and air outlet, reducing the risk of flammable gas accumulation and improving explosion-proof performance.

[0018] 3. Compact and reliable structure: It adopts gear transmission and reciprocating screw linkage design, integrated cleaning and cooling functions, stable structure and easy maintenance; the cooling box and casing share the same wall design to save space, and the installation foot reinforcement ribs improve the overall strength.

[0019] 4. Strong environmental adaptability: It can still maintain efficient heat dissipation in high temperature, high humidity or closed environment, ensuring long-term stable operation of the motor and extending its service life.

[0020] 5. Energy saving and environmental protection: Through internal gas recycling, it reduces dependence on external heat dissipation equipment, reduces energy consumption, and meets the needs of green manufacturing.

[0021] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 This is a schematic diagram of the overall structure of an explosion-proof three-phase asynchronous motor; Figure 2 This is the left side view of an explosion-proof three-phase asynchronous motor; Figure 3 for Figure 2 Middle AA section; Figure 4 for Figure 3 Enlarged view of part A; Figure 5 for Figure 3 Enlarged view of part B; Figure 6 for Figure 3 Middle BB cross-section; Figure 7 for Figure 3 mid-CC cross-section; Figure 8 This is a structural diagram of an explosion-proof three-phase asynchronous motor from another perspective.

[0024] In the accompanying drawings, the components represented by the reference numerals are as follows: 1. Casing; 101. Heat dissipation fins; 102. Support frame; 103. Arc plate; 104. Support column; 105. Reciprocating screw; 106. Bevel gear A; 107. Avoidance chamber; 108. Bevel gear A; 109. Transmission shaft; 110. Bevel gear B; 111. Bevel gear B; 112. Guide rod; 113. Cleaning plate; 114. Movable groove; 115. Extrusion spring; 116. Arc brush plate; 117. Mounting foot; 118. Cooling box; 119. Piston tube; 120. Return spring; 121. Piston rod; 122. Hemispherical end; 123. Annular air outlet channel; 123. Annular air outlet channel; 124. Annular air inlet channel; 125, air inlet hole; 126, circular ring; 127, annular groove; 128, return spring; 129, non-return cover; 130, cooling pipe; 131, air outlet pipe; 132, air outlet hole; 133, eccentric wheel; 134, coolant inlet pipe; 135, coolant outlet pipe; 136, valve; 2, front end cover; 201, mounting block; 202, threaded hole; 203, mounting hole; 204, bolt A; 3, rear end cover; 301, annular slot; 302, annular insert; 303, fixing hole; 304, bolt B; 4, stator; 5, rotor; 6, rotating shaft; 7, centrifugal fan blade; 8, rear bearing; 9, front bearing. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0026] In the description of the present invention, it should be understood that the terms "upper", "middle", "outer", "inner" and the like indicating directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as limiting the present invention.

[0027] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "connected," etc., should be understood in a broad sense. For example, "connected" may refer to a fixed connection, a detachable connection, or an integral connection; it may refer to a mechanical connection or an electrical connection; it may refer to a direct connection or an indirect connection through an intermediate medium; it may refer to internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0028] See also Figures 1-8As shown, the present invention is an explosion-proof three-phase asynchronous motor, comprising a casing 1, and a front cover 2 and a rear cover 3 respectively fixed to the front and rear ends of the casing 1 by bolts. A stator 4, a rotor 5 and a rotating shaft 6 are provided inside the casing 1. One end of the rotating shaft 6 passes through the inner wall of one side of the rear end cover 3 and is connected to a centrifugal fan blade 7. The rotating shaft 6 is rotatably connected to the rear end cover 3 through a rear bearing 8. The other end of the rotating shaft 6 penetrates a side wall of the front cover 2 and is rotatably connected to the front end cover 2 through a front bearing 9. The rotor 5 is sleeved on the rotating shaft 6, the rotor 5 is fixedly connected to the rotating shaft 6, and the stator 4 is fixedly connected to the inner wall of the casing 1. A plurality of heat dissipation fins 101 are provided on the side surface of the casing 1. Support frames 102 are fixed at both ends of the side surface of the casing 1. The support frame 102 includes an arc-shaped plate 103 and support columns 104 evenly fixed on the inner arc surface of the arc-shaped plate 103. The support columns 104 are fixedly connected to the outer wall of the casing 1. A reciprocating screw 105 is connected to the middle part of the two arc-shaped plates 103 to rotate together. A bevel gear A106 is fixed to one end of the reciprocating screw 105. An avoidance cavity 107 is provided inside the arc-shaped plate 103 where the bevel gear A106 is located. A bevel gear A108 is meshed with the lower side of the bevel gear A106. The shape and size of the bevel gear A106 are adapted to the bevel gear A108. The bevel gear A106 cooperates with the bevel gear A108. A transmission shaft 109 is fixed to the lower surface of the bevel gear A108. The driving shaft 109 passes through the support frame 102 and extends to the inside of the casing 1. A bevel gear B110 is fixed to the lower end of the transmission shaft 109, and a bevel gear B111 matching the bevel gear B110 is fixed to the side surface of the rotating shaft 6. The shape and size of the bevel gear B110 are adapted to the bevel gear B111, and the bevel gear B110 and the bevel gear B111 cooperate with each other; both ends of the two arc plates 103 are commonly connected to a guide rod 112, and a cleaning plate 113 is commonly provided on the reciprocating screw 105 and the two guide rods 112. The cleaning plate 113 is threadedly fitted with the reciprocating screw 105, and the cleaning plate 113 is slidably fitted with the guide rod 112; a movable groove 114 is provided on the inner arc surface of the cleaning plate 113, and two arc brush plates 116 are fixed in the movable groove 114 by an extrusion spring 115; The outer wall of the lower side of the casing 1 is symmetrically fixed with mounting feet 117, and a cooling box 118 is provided between the two mounting feet 117. The cooling box 118 is fixedly connected to the casing 1, and the cooling box 118 and the casing 1 share a side wall. A plurality of piston tubes 119 are provided on the inner wall of the front end of the casing 1. A return spring 120 is fixed on the step on the side of the piston tube 119. A piston rod 121 is provided in the return spring 120. The shape and size of the piston tube 119 are adapted to the piston rod 121, and the piston tube 119 and the piston rod 121 are nested and matched; A hemispherical end 122 is provided at one end of the plug rod 121, and a return spring 120 is fixedly connected to the lower surface of the hemispherical end 122. An annular air outlet channel 123 is provided inside the housing 1 where the piston tube 119 is located, and the piston tube 119 is connected to the annular air outlet channel 123; an annular air inlet channel 124 is provided on one side of the annular air outlet channel 123, and an air inlet hole 125 is provided in the middle of the side surface of the piston tube 119. A circular ring 126 is fixed to the lower end of the inner wall of the piston tube 119, and an annular groove 127 is provided on the lower surface of the circular ring 126. A return spring 128 is fixed, and a non-return cover plate 129 is fixed to the lower end of the return spring 128. The shape and size of the non-return cover plate 129 are adapted to the annular groove 127. The non-return cover plate 129 cooperates with the annular groove 127. When the piston rod 121 and the piston tube 119 reciprocate, the piston rod 121 pushes forward to squeeze the gas and push the non-return cover plate 129 to send the gas into the cooling pipe 130. When the piston rod 121 retracts, the non-return cover plate 129 closes the channel to prevent the gas in the cooling pipe 130 from being drawn back. At this time, the air inlet hole 125 is opened. Gas, supporting the piston rod 121 to extend next time; a cooling pipe 130 is provided in the cooling box 118, one end of the cooling pipe 130 is connected to the annular air outlet channel 123, and the other end of the cooling pipe 130 is connected to the rear end of the casing 1, and the middle of the cooling pipe 130 is connected to the air outlet pipe 131, and the free end of the air outlet pipe 131 is connected to the annular air inlet channel 124. A plurality of air outlet holes 132 are opened on the inner wall of the casing 1, and the air outlet holes 132 are connected to the annular air inlet channel 124. An eccentric wheel 133 adapted to the hemispherical end head 122 is fixed to the side surface of the rotating shaft 6.

[0029] Among them, the front end bearing of the casing 1 is provided with several mounting blocks 201, a surface of the mounting block 201 is provided with a threaded hole 202, and a surface of the front end cover 2 is provided with a mounting hole 203 corresponding to the mounting block 201, and the bolt A204 passes through the mounting hole 203 and is threadedly connected with the threaded hole 202 of the mounting block 201.

[0030] Among them, an annular slot 301 is opened on the rear end face of the casing 1, an annular plug block 302 is provided on the inner wall of the rear end cover 3, a fixing hole 303 is opened on the side surface of the rear end cover 3, and a fixing through hole corresponding to the fixing hole 303 is opened on the side surface of the rear end of the casing 1. The bolt B304 passes through the fixing hole 303 and the fixing through hole and is threadedly fixed to the annular plug block 302. The shape and size of the annular slot 301 are adapted to the annular plug block 302, and the annular slot 301 and the annular plug block 302 are plugged in.

[0031] Among them, the shape and size of the arc-shaped brush plate 116 are adapted to the movable groove 114 , the arc-shaped brush plate 116 and the movable groove 114 cooperate with each other, the shape and size of the arc-shaped brush plate 116 are adapted to the heat dissipating fins 101 , and the bristles of the arc-shaped brush plate 116 are against the heat dissipating fins 101 .

[0032] Among them, a plurality of heat dissipation holes are opened on one end surface of the rear end cover 3, and a plurality of reinforcing ribs are provided on the mounting foot 117.

[0033] Among them, the front end face and the rear end face of the cooling box 118 are respectively connected to the cooling liquid inlet pipe 134 and the cooling liquid outlet pipe 135, and valves 136 are provided on the side surfaces of the cooling liquid inlet pipe 134 and the cooling liquid outlet pipe 135. The cooling liquid inlet pipe 134 and the cooling liquid outlet pipe 135 are connected to the cooling equipment. When the motor is running, the valves 136 of the cooling liquid inlet pipe 134 and the cooling liquid outlet pipe 135 are both opened, and the cooling liquid inlet pipe 134 of the cooling box 118 continuously enters the cooling liquid, and the cooling liquid outlet pipe 135 continuously discharges the cooling liquid with increased temperature, ensuring that the cooling liquid in the cooling box 118 always remains at a low temperature.

[0034] See also Figures 1-8 As shown, this embodiment is an explosion-proof three-phase asynchronous motor working principle: When the motor is started, the rotating shaft 6 rotates to drive the eccentric wheel 133 and the bevel gear B111 to rotate synchronously. When the eccentric wheel 133 rotates, it squeezes the semicircular end 122, causing the piston rod 121 and the piston tube 119 to perform reciprocating piston motion, and compresses the gas in the casing 1 into the cooling pipe 130 through the air inlet hole 125. Part of the cooled gas enters the rear end of the casing 1 through the through hole to cool the motor, and the other part of the gas enters the annular air inlet channel 124 through the air outlet pipe 131 and enters the casing through the air outlet hole 132. 1, to disperse the explosive gas gathered in the front end of the casing 1, and at the same time cool the gas in the casing; at the same time, the bevel gear B111 rotates and engages with the bevel gear B110 to drive the transmission shaft 109 to rotate, so that the bevel gear A108 engages with the bevel gear A106 to drive the reciprocating screw 105 to rotate, and the reciprocating screw 105 cooperates with the cleaning plate 113 to make the arc-shaped brush plate 116 reciprocate along the direction of the guide rod 112 to clean the heat dissipation fins 101 on the casing 1 to prevent dust accumulation from affecting the heat dissipation of the motor.

[0035] It should be further explained that the piston tube 119 and the air outlet holes 132 are arranged in a circular array along the periphery of the rotating shaft 6 to ensure stable operation of the motor.

[0036] Throughout this specification, references to terms such as "one embodiment," "example," and "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0037] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the content of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. An explosion-proof three-phase asynchronous motor, comprising a housing (1), and a front cover (2) and a rear cover (3) respectively fixed to the front and rear ends of the housing (1) by bolts, characterized in that: The housing (1) is provided with a stator (4), a rotor (5) and a rotating shaft (6). One end of the rotating shaft (6) passes through the inner wall of one side of the rear end cover (3) and is connected to a centrifugal fan blade (7). The rotating shaft (6) is rotatably connected to the rear end cover (3) via a rear bearing (8). The other end of the rotating shaft (6) passes through a side wall of the front end cover (2) and is rotatably connected to the front end cover (2) via a front bearing (9). The rotor (5) is sleeved on the rotating shaft (6). The rotor (5) is fixedly connected to the rotating shaft (6). The stator (4) is fixedly connected to the inner wall of the housing (1). The casing (1) is provided with a plurality of heat dissipation fins (101) on the peripheral side surface, and support frames (102) are fixed at both ends of the peripheral side surface of the casing (1), and the support frame (102) includes an arc plate (103) and a support column (104) uniformly fixed on the inner arc surface of the arc plate (103), and the support column (104) is fixedly connected to the outer wall of the casing (1), and the middle parts of the two arc plates (103) are connected to a reciprocating screw (105) for common rotation, and a bevel gear A (106) is fixed to one end of the reciprocating screw (105), and a avoidance cavity (107) is provided inside the arc plate (103) where the bevel gear A (106) is located, and a bevel gear A (108) is meshed with the lower side of the bevel gear A (106), and a transmission shaft (109) is fixed to the lower surface of the bevel gear A (108), and the The transmission shaft (109) passes through the support frame (102) and extends to the inside of the housing (1). A bevel gear B (110) is fixed to the lower end of the transmission shaft (109). A bevel gear B (111) matching the bevel gear B (110) is fixed to the side surface of the rotating shaft (6). Both ends of the two arc plates (103) are connected to a guide rod (112). A cleaning plate (113) is provided on the reciprocating screw (105) and the two guide rods (112). The cleaning plate (113) and the reciprocating screw (105) are threadedly engaged, and the cleaning plate (113) and the guide rod (112) are slidably engaged. A movable groove (114) is provided on the inner arc surface of the cleaning plate (113). Two arc brush plates (116) are fixed in the movable groove (114) via a compression spring (115). The lower outer wall of the housing (1) is symmetrically fixed with mounting feet (117), a cooling box (118) is provided between the two mounting feet (117), the cooling box (118) is fixedly connected to the housing (1), and the cooling box (118) and the housing (1) share a side wall, a plurality of piston tubes (119) are provided on the inner wall of the front end of the housing (1), a return spring (120) is fixed on the step of the side surface of the piston tube (119), a piston rod (121) is provided in the return spring (120), and the piston A hemispherical end cap (122) is provided at one end of the rod (121), the return spring (120) is fixedly connected to the lower surface of the hemispherical end cap (122), an annular air outlet passage (123) is provided inside the housing (1) where the piston tube (119) is located, and the piston tube (119) is communicated with the annular air outlet passage (123); an annular air inlet passage (124) is provided on one side of the annular air outlet passage (123), an air inlet hole (125) is provided in the middle of the side surface of the piston tube (119), and the piston tube (119) A circular ring (126) is fixed at the lower end of the inner wall, and an annular groove (127) is provided on the lower surface of the circular ring (126). A return spring (128) is fixed in the annular groove (127), and a non-return cover plate (129) is fixed at the lower end of the return spring (128). The shape and size of the non-return cover plate (129) are adapted to the annular groove (127). The non-return cover plate (129) and the annular groove (127) cooperate with each other. A cooling pipe (130) is provided in the cooling box (118), and the cooling pipe (130) is The end of the cooling pipe (130) is connected to the annular air outlet channel (123), the other end of the cooling pipe (130) is connected to the interior of the rear end of the casing (1), the middle of the cooling pipe (130) is connected to an air outlet pipe (131), the free end of the air outlet pipe (131) is connected to the annular air inlet channel (124), the inner wall of the casing (1) is provided with a plurality of air outlet holes (132), the air outlet holes (132) are connected to the annular air inlet channel (124), and an eccentric wheel (133) adapted to the hemispherical end (122) is fixed to the side surface of the rotating shaft (6).

2. The explosion-proof three-phase asynchronous motor according to claim 1, characterized in that: The front end bearing of the housing (1) is provided with a plurality of mounting blocks (201), a threaded hole (202) is provided on one surface of the mounting block (201), a mounting hole (203) corresponding to the mounting block (201) is provided on one surface of the front end cover (2), and a bolt A (204) passes through the mounting hole (203) and is threadedly connected to the threaded hole (202) of the mounting block (201).

3. The explosion-proof three-phase asynchronous motor according to claim 1, characterized in that: The rear end surface of the housing (1) is provided with an annular slot (301), the inner wall of the rear end cover (3) is provided with an annular insert (302), the peripheral side surface of the rear end cover (3) is provided with a fixing hole (303), the rear end peripheral side surface of the housing (1) is provided with a fixing through hole corresponding to the fixing hole (303), and a bolt B (304) passes through the fixing hole (303) and the fixing through hole and is threadedly fixedly connected to the annular insert (302).

4. The explosion-proof three-phase asynchronous motor according to claim 1, characterized in that: The shape and size of the arc-shaped brush plate (116) are adapted to the movable groove (114), the arc-shaped brush plate (116) and the movable groove (114) cooperate with each other, the shape and size of the arc-shaped brush plate (116) are adapted to the heat dissipation fins (101), and the bristles of the arc-shaped brush plate (116) are against the heat dissipation fins (101).

5. The explosion-proof three-phase asynchronous motor according to claim 1, characterized in that: The shape and size of the piston tube (119) are adapted to the piston rod (121), and the piston tube (119) and the piston rod (121) are nested and matched.

6. The explosion-proof three-phase asynchronous motor according to claim 1, characterized in that: The shape and size of the bevel gear A (106) are adapted to the bevel gear A (108), and the bevel gear A (106) and the bevel gear A (108) cooperate with each other.

7. The explosion-proof three-phase asynchronous motor according to claim 1, characterized in that: The shape and size of the bevel gear B (110) are adapted to the bevel gear B (111), and the bevel gear B (110) and the bevel gear B (111) cooperate with each other.

8. The explosion-proof three-phase asynchronous motor according to claim 3, characterized in that: The shape and size of the annular slot (301) are adapted to the annular insert block (302), and the annular slot (301) and the annular insert block (302) are plugged into each other.

9. The explosion-proof three-phase asynchronous motor according to claim 1, characterized in that: A plurality of heat dissipation holes are provided on one end surface of the rear end cover (3), and a plurality of reinforcing ribs are provided on the mounting foot (117).

10. The explosion-proof three-phase asynchronous motor according to claim 1, characterized in that: The front end face and the rear end face of the cooling box (118) are respectively connected to a cooling liquid inlet pipe (134) and a cooling liquid outlet pipe (135), and valves (136) are provided on the side surfaces of the cooling liquid inlet pipe (134) and the cooling liquid outlet pipe (135). The cooling liquid inlet pipe (134) and the cooling liquid outlet pipe (135) are connected to the cooling equipment.

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