Explosion-proof motor

Abstract

The invention relates to the field of motors, in particular to an explosion-proof motor which comprises a shell, an end cover and a sealing device, the end cover comprises a cover body and a ring body, the cover body is connected to the shell, the ring body is connected to the surface, facing the shell, of the cover body, the sealing device comprises a sealing ring bag, an abutting ring and an inflation assembly, and the inner wall of the shell is provided with a sealing cavity allowing the abutting ring to be embedded therein. The sealing ring bag is connected to the inner wall of the sealing cavity, an abutting cavity allowing the sealing ring bag to be embedded is reserved in the ring face of the abutting ring, the inflation assembly is connected between the shell and the sealing ring bag, the sealing ring bag is pressurized and expanded, the sealing ring bag extrudes the inner wall of the abutting cavity, and the inner ring wall of the abutting ring abuts against the outer circumferential face of the ring body to form sealing. According to the invention, the arrangement of the sealing ring bag, the abutting ring and the inflation assembly enables rainwater not to enter the inner cavity of the housing from the abutting part of the housing and the ring body easily, and avoids the short circuit between the windings or between the windings and the housing due to the rainwater, thereby improving the use safety of a user for the motor, and prolonging the service life of the motor.

Description

Technical Field

[0001] This application relates to the field of electric motors, and more particularly to an explosion-proof electric motor. Background Technology

[0002] An electric motor is an electromagnetic device that converts electrical energy into mechanical energy. It achieves energy conversion through the principle of electromagnetic induction and is widely used to drive various mechanical equipment.

[0003] When rainwater enters the inner cavity of the motor housing through the tight joint between the housing and the end cover, it causes short circuits between the windings or between the windings and the housing, resulting in a large current discharge and thus reducing the safety of the motor for the user. Summary of the Invention

[0004] In order to improve the safety of motor use, this application provides an explosion-proof motor.

[0005] This application provides an explosion-proof motor, which adopts the following technical solution: An explosion-proof motor includes a housing, an end cap, and a sealing device. The end cap includes a cover body and a ring body. The cover body is connected to the housing, and the ring body is connected to the surface of the cover body facing the housing. The outer peripheral surface of the ring body abuts against the inner wall of the housing to form a seal. The sealing device includes a sealing ring bladder, a retaining ring, and an inflation assembly. The inner wall of the housing has a sealing cavity for the retaining ring to be embedded in. The sealing ring bladder is connected to the inner wall of the sealing cavity. The retaining ring has a retaining cavity for the sealing ring bladder to be embedded in. The inflation assembly is connected between the housing and the sealing ring bladder. The inflation assembly can inflate the inner cavity of the sealing ring bladder. The sealing ring bladder expands under pressure, and the sealing ring bladder compresses the inner wall of the retaining cavity. The inner ring wall of the retaining ring abuts against the outer peripheral surface of the ring body to form a seal.

[0006] By adopting the above technical solution, when the retaining ring is embedded in the sealing cavity, the retaining ring bladder is embedded in the retaining cavity, and the inner wall of the retaining cavity abuts against the outer circumferential surface of the sealing ring bladder to form a limit. When the cover is installed on the housing, the ring is embedded in the inner cavity of the housing, and the outer circumferential surface of the ring abuts against the inner wall of the housing to form a seal, thus achieving a preliminary seal for the motor. At the same time, the inflation component inflates the inner cavity of the sealing ring bladder, the sealing ring bladder is pressurized and expands and squeezes the inner wall of the retaining cavity, the inner wall of the sealing cavity is deformed under pressure and drives the inner ring wall of the retaining ring to abut against the outer circumferential surface of the ring to form a seal, thus achieving a secondary seal for the motor. This makes it difficult for rainwater to enter the inner cavity of the housing from the abutment point between the housing and the ring, avoiding short circuits between the windings or between the windings and the housing due to rainwater, thereby improving the safety of the motor for the user and extending the service life of the motor.

[0007] Optionally, the inner wall of the clamping ring is coaxially provided with a deformation cavity.

[0008] By adopting the above technical solution, the deformation cavity provides space for the sealing ring to deform. When the sealing cavity is squeezed and deformed by the sealing ring, the deformation cavity receives the pressure of the sealing cavity and deforms in the direction closer to the ring axis. The deformation cavity reduces local fatigue of the sealing ring by uniformly distributing the deformation stress, thereby extending the service life of the sealing ring.

[0009] Optionally, the housing has an installation cavity on the surface facing the cover to accommodate an inflation assembly. The inflation assembly includes an inflation piston, a first connecting rod, a second connecting rod, and a mounting block. The inner wall of the installation cavity has an inflation channel for the inflation piston to slide. The inflation channel communicates with the inner cavity of the sealing ring bladder. The mounting block is connected to the inner wall of the installation cavity away from the inflation channel. One end of the first connecting rod is rotatably connected to the surface of the mounting block facing the inflation channel. The other end of the first connecting rod is rotatably connected to the end of the second connecting rod. The end of the second connecting rod away from the first connecting rod is rotatably connected to the end face of the inflation piston. When the cover is connected to the housing, the surface of the cover abuts against the rotatably connected ends of the first and second connecting rods and pushes the first and second connecting rods to rotate toward the direction closer to the installation cavity, causing the inflation piston to slide toward the direction closer to the sealing ring bladder. The end faces of the first and second connecting rods are flush with the end face of the housing.

[0010] By adopting the above technical solution, when the cover is installed on the housing, the end face of the cover abuts against the end of the connecting rod 1 and the connecting rod 2 that are rotatably connected, and pushes the connecting rod 1 and the connecting rod 2 to rotate toward the direction of the mounting cavity. The rod face of the connecting rod 1 and the end face of the connecting rod 2 are flush with the end face of the housing. At the same time, the inflation piston is driven to slide along the groove of the inner wall of the inflation channel toward the sealing ring bladder. The air in the inflation channel enters the inner cavity of the sealing ring bladder. The surface of the sealing ring bladder is pressurized and expands, and squeezes against the inner wall of the cavity. The inner ring wall of the sealing ring is deformed by pressure and presses against the outer peripheral surface of the ring to form a seal, which further improves the pressing force between the inner ring wall of the sealing ring and the outer peripheral surface of the ring.

[0011] Optionally, the inflation assembly further includes an elastic element one, one end of which is connected to the inner wall of the inflation channel in the direction of elastic force, and the other end of which is connected to the surface of the inflation piston in the direction of elastic force. The elastic element one has the elastic force to drive the inflation piston to slide away from the inflation channel, and the ends of the connecting rod one and connecting rod two that are rotatably connected protrude from the surface of the housing.

[0012] By adopting the above technical solution, when the cover is removed from the housing, the pressure of the cover on connecting rod 1 and connecting rod 2 disappears. The elastic force of elastic element 1 drives the inflation piston to slide towards the mounting cavity, causing connecting rod 1 and connecting rod 2 to rotate away from the mounting cavity. The rotating ends of connecting rod 1 and connecting rod 2 protrude from the end face of the housing. At the same time, the air in the sealing ring bladder flows back into the inflation channel, the sealing ring bladder depressurizes and contracts, and the compression of the sealing ring bladder on the clamping ring disappears, thus facilitating the replacement of the clamping ring by the operator and improving the ease of use of the explosion-proof motor.

[0013] Optionally, the second connecting rod is located on the side of the inflation piston away from the ring body. The inflation assembly also includes a water-absorbing expansion block and an elastic element two. The mounting block is slidably connected to the inner wall of the mounting cavity. The sliding direction of the mounting block is parallel to the sliding direction of the inflation piston. The water-absorbing expansion block is connected to the side of the mounting block away from the first connecting rod. One end of the elastic element two in the elastic direction is connected to the surface of the mounting block, and the other end of the elastic element two in the elastic direction is connected to the inner wall of the mounting cavity. The elastic element two has the elastic force to drive the mounting block to slide away from the inflation channel, and the inner wall of the mounting cavity and the end face of the mounting block tend to clamp the two sides of the water-absorbing expansion block.

[0014] By adopting the above technical solution, the elastic element two drives the mounting block to slide away from the inflation channel, and the inner wall of the mounting cavity and the end face of the mounting block clamp the two sides of the water-absorbing expansion block. When rainwater enters the mounting cavity from the abutment of the shell and the cover, the water-absorbing expansion block absorbs water and expands, and pushes the mounting block to slide closer to the inflation channel. Linkage one and link two receive the power of the mounting block and push the inflation piston to slide closer to the sealing ring bladder, which drives the air in the inflation channel into the inner cavity of the sealing ring bladder. The surface of the sealing ring bladder is pressurized and expands and squeezes against the inner wall of the cavity, pushing the inner ring wall of the sealing ring to press against the outer peripheral surface of the ring to form a seal, further improving the clamping force between the inner ring wall of the sealing ring and the outer peripheral surface of the ring.

[0015] Optionally, the end face of the water-absorbing expansion block facing the mounting block is connected to an insert, and the surface of the mounting block is provided with a groove for the insert to be inserted into, and the end face of the insert abuts against the inner wall of the groove to form a limiting position.

[0016] By adopting the above technical solution, when it is necessary to replace the water-absorbing expansion block, the insert is driven to slide along the inner wall of the groove away from the mounting block, the insert is disengaged from the groove, and the limiting effect of the water-absorbing expansion block on the mounting block is eliminated, which facilitates the replacement of the water-absorbing expansion block and further improves the ease of use of the explosion-proof motor.

[0017] Optionally, the inflatable assembly further includes a warning rod and an elastic element three. The surface of the housing has a warning cavity for the warning rod to slide in. The sliding direction of the warning rod is perpendicular to the sliding direction of the mounting block, and the warning cavity is connected to the mounting cavity. The warning cavity is located on the side of the mounting block away from the water-absorbing expansion block. One end of the elastic element three in the elastic direction is connected to the inner wall of the warning cavity, and the other end of the elastic element three in the elastic direction is connected to the surface of the warning rod. The elastic element three has the elasticity to drive the warning rod to slide towards the mounting cavity. One end of the warning rod protrudes from the bottom wall of the mounting cavity, and the other end of the warning rod tends to be flush with the surface of the housing.

[0018] By adopting the above technical solution, the elastic element drives the mounting rod to slide towards the mounting cavity. One end of the mounting rod protrudes from the bottom wall of the mounting cavity, and the other end of the mounting rod is flush with the surface of the housing. When the water-absorbing expansion block absorbs water and expands, it pushes the mounting block to slide along the inner wall of the mounting cavity towards the direction of the airflow channel. The end of the mounting block abuts against the end of the warning rod and pushes the warning rod to slide away from the mounting cavity. The end of the warning rod protrudes from the end face of the housing, thereby alerting the user to replace the water-absorbing expansion block in time.

[0019] Optionally, the end of the warning rod protruding from the bottom wall of the mounting cavity is provided with a guide surface. The guide surface is in the shape of a circular arc protrusion. The guide surface can abut against the end face of the mounting block and push the warning rod to slide away from the mounting cavity.

[0020] By adopting the above technical solution, the guide surface is in the shape of a circular arc protrusion. The guide surface can abut against the end face of the mounting block and guide the warning rod to slide away from the mounting cavity. The end of the warning rod protrudes from the surface of the housing, reducing the wear between the mounting block and the warning rod, thereby extending the service life of the motor.

[0021] Optionally, the inflation assembly further includes a compression plate, a connecting rope, and an elastic element four. The inner wall of the sealed cavity has a compression chamber for the compression plate to slide in. The sliding direction of the compression plate is parallel to the sliding direction of the inflation piston. One end of the elastic element four, in the direction of its elastic force, is connected to the surface of the compression plate, and the other end is connected to the inner wall of the compression chamber. The elastic element four has an elastic force that drives the compression plate to slide towards the clamping ring, and the surface of the compression plate tends to press against the surface of the clamping ring. The elastic coefficient of the elastic element four is less than that of the elastic coefficient of the elastic element two. The warning chamber connects the mounting chamber and the compression chamber. One end of the connecting rope is connected to the surface of the mounting block, and the other end is connected to the surface of the compression plate. The connecting rope between the compression plate and the mounting block is in a taut state.

[0022] By adopting the above technical solution, the connecting rope between the extrusion plate and the mounting block is in a taut state, and the elastic coefficient of the fourth elastic element is less than that of the second elastic element. When the water-absorbing expansion block absorbs water and expands, pushing the mounting block to slide towards the direction of the airflow channel, the distance between the mounting block and the extrusion plate decreases, the tensioning effect of the connecting rope on the extrusion plate disappears, and the elastic force of the fourth elastic element drives the extrusion plate to slide along the inner wall of the extrusion cavity towards the direction of the clamping ring. The surface of the extrusion plate and the outer circumference of the ring clamp the two sides of the clamping ring to form a seal, further improving the sealing performance of the explosion-proof motor.

[0023] Optionally, the extrusion plate has multiple deformation grooves spaced apart on its surface facing the clamping ring, and the inner wall of the deformation grooves abuts against the surface of the clamping ring to form a seal.

[0024] By adopting the above technical solution, multiple deformation grooves are distributed at intervals on the surface of the extrusion plate facing the clamping ring. The deformation grooves provide space for the clamping ring to deform, so that the clamping ring is uniformly compressed under pressure, avoiding sealing failure caused by excessive extrusion or local deformation, thereby further ensuring the sealing stability between the inner ring wall of the clamping ring and the outer circumferential surface of the ring.

[0025] In summary, this application includes at least one of the following beneficial technical effects: 1. The design of the sealing ring, the clamping ring, and the inflation assembly prevents rainwater from easily entering the inner cavity of the housing from the clamping point between the housing and the ring, thus avoiding short circuits between the windings or between the windings and the housing due to rainwater. This improves the safety of the motor for the user and extends the service life of the motor. 2. The deformation cavity is designed to uniformly distribute deformation stress, thereby reducing local fatigue on the retaining ring and extending its service life. 3. The arrangement of the inflatable piston, connecting rod one, connecting rod two, and mounting block increases the pressure on the surface of the sealing ring bladder, causing it to expand and press against the inner wall of the cavity. The inner ring wall of the sealing ring is deformed under pressure and presses against the outer circumferential surface of the ring to form a seal, further improving the pressing force between the inner ring wall of the sealing ring and the outer circumferential surface of the ring. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure in an embodiment of this application.

[0027] Figure 2 This is a partial cross-sectional view of an embodiment of this application, mainly showing the ring body.

[0028] Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0029] Explanation of reference numerals in the attached drawings: 1. End cap; 11. Cover body; 111. Mounting hole; 112. Threaded hole one; 12. Ring body; 2. Housing; 21. Threaded hole two; 22. Sealing cavity; 23. Mounting cavity; 24. Inflation channel; 25. Warning cavity; 26. Compression cavity; 3. Sealing device; 31. Sealing ring bladder; 32. Anchoring ring; 321. Deformation cavity; 322. Anchoring cavity; 33. Inflation assembly; 331 331. Connecting rod 1; 332. Inflatable piston; 333. Connecting rod 2; 334. Mounting block; 3341. Groove; 335. Elastic component 1; 336. Water-absorbing expansion block; 337. Elastic component 2; 338. Warning rod; 3381. Guide surface; 339. Elastic component 3; 3310. Extrusion plate; 3311. Connecting rope; 3312. Elastic component 4; 3313. Deformation groove; 4. Rotating shaft; 5. Insert. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1-3This application will be described in further detail.

[0031] This application discloses an explosion-proof motor. (Refer to...) Figure 1 and Figure 2 The explosion-proof motor includes a housing 2, an end cover 1, and a sealing device 3. The end cover 1 includes a cover body 11 and a ring body 12. The end face of the cover body 11 has a mounting hole 111 for a rotating shaft 4 on the housing 2 to pass through. The axis of the mounting hole 111 extends through both sides of the cover body 11 in the thickness direction. The ring body 12 is integrally formed and fixed to the end face of the cover body 11. The axis of the ring body 12 coincides with the axis of the mounting hole 111. The surface of the cover body 11 has multiple threaded holes 21 for bolts to pass through. The axis of the threaded holes 21 is parallel to the axis of the mounting hole 111. The multiple threaded holes 21 are evenly distributed around the axis of the mounting hole 111. The surface of the housing 2... Multiple threaded holes 112 are provided at intervals for bolts to pass through. The axis of the threaded holes 112 is parallel to the axis of the rotating shaft 4. The multiple threaded holes 112 are evenly distributed around the axis of the rotating shaft 4. When the cover 11 covers the end face of the shell 2, the ring 12 is embedded in the inner cavity of the shell 2. The outer circumferential surface of the ring 12 abuts against the inner cavity wall of the shell 2 to form a seal. The rotating shaft 4 on the shell 2 is provided with mounting holes 111, and the threaded holes 112 and 21 are corresponding and connected one-to-one. The bolt end passes through the threaded holes 21 and 112 and is threaded and fixed to the inner ring wall of the nut, so as to realize the detachable fixation of the cover 11 on the ring 12.

[0032] Reference Figure 2 and Figure 3 The sealing device 3 is installed between the cover 11 and the housing 2. The sealing device 3 can improve the sealing performance between the cover 11 and the housing 2, making it difficult for rainwater to enter the inner cavity of the housing 2 from the tight joint between the housing 2 and the ring 12. This avoids short circuits between the windings or between the windings and the housing 2 due to rainwater, thereby improving the safety of the motor for the user and extending the service life of the motor.

[0033] Reference Figure 2 and Figure 3 The sealing device 3 includes a sealing ring bladder 31, a clamping ring 32, and an inflation assembly 33. The sealing ring bladder 31 and the clamping ring 32 can be made of rubber or silicone. In this embodiment, the sealing ring bladder 31 and the clamping ring 32 are both made of rubber, which has a certain deformation capacity. The inner wall of the housing 2 facing the ring body 12 is provided with a sealing cavity 22 for the clamping ring 32 to be embedded. The outer ring wall of the clamping ring 32 abuts against the inner wall of the sealing cavity 22, and the inner ring wall of the clamping ring 32 abuts against the outer circumferential surface of the ring body 12 to form a seal. The inner ring wall of the clamping ring 32 is coaxially provided with a deformation cavity 321. When the outer circumferential surface of the ring body 12 and the inner wall of the sealing cavity 22 clamp the inner and outer ring walls of the clamping ring 32 one by one, the deformation cavity 321 provides deformation space. The inner wall of the deformation cavity 321 reduces local fatigue of the clamping ring 32 by uniformly distributing deformation stress, thereby extending the service life of the clamping ring 32.

[0034] Reference Figure 2 and Figure 3 One end of the sealing ring bladder 31 is fixed to the inner wall of the sealing cavity 22, and the other end of the sealing ring bladder 31 faces the ring surface of the clamping ring 32. The ring surface of the clamping ring 32 is coaxially provided with a clamping cavity 322 for the sealing ring bladder 31 to be embedded. The inflation component 33 is installed between the housing 2 and the sealing ring bladder 31. The inflation component 33 can inflate the sealing ring bladder 31. The sealing ring bladder 31 is pressurized and expanded. The outer peripheral surface of the sealing ring bladder 31 squeezes the inner wall of the clamping cavity 322 and pushes the inner ring wall of the clamping ring 32 to abut against the outer peripheral surface of the ring body 12 to form a seal, further improving the clamping force between the inner ring wall of the clamping ring 32 and the outer peripheral surface of the ring body 12.

[0035] Reference Figure 2 and Figure 3 The housing 2 has a mounting cavity 23 on the surface facing the cover 11 to accommodate the inflation component 33. The mounting cavity 23 is located between the threaded hole 112 and the sealing cavity 22. The inflation component 33 includes an inflation piston 332, a connecting rod 1 331, a connecting rod 2 333, a mounting block 334, an elastic element 1 335, a water-absorbing expansion block 336, an elastic element 2 337, a warning rod 338, an elastic element 339, a compression plate 3310, a connecting rope 3311, and an elastic element 4 3312. The inflation piston 332 can be made of rubber or silicone. In this embodiment, the inflation piston 332 is made of rubber and has a certain deformation capability.

[0036] Reference Figure 2 and Figure 3 The mounting block 334 is slidably connected to the inner wall of the mounting cavity 23. The sliding direction of the mounting block 334 is perpendicular to the axis of the rotating shaft 4. The material of the water-absorbing expansion block 336 can be polyacrylic acid or water-absorbing resin. In this embodiment, the material of the water-absorbing expansion block 336 is water-absorbing resin. An insert 5 is fixed at the end of the water-absorbing expansion block 336. The end face of the mounting block 334 near the threaded hole 112 is provided with a groove 3341 for the insert 5 to slide. When the insert 5 is embedded in the groove 3341, the outer peripheral surface of the insert 5 abuts against the inner wall of the groove 3341 to form a limit, thereby realizing the detachable installation between the water-absorbing expansion block 336 and the mounting block 334.

[0037] Reference Figure 2 and Figure 3The second elastic element 337 can be a compression spring or a tension spring. In this embodiment, the second elastic element 337 is a compression spring, which has a certain deformation capability. One end of the second elastic element 337 in the elastic direction is connected to the inner wall of the mounting cavity 23, and the other end of the second elastic element 337 in the elastic direction is connected to the surface of the mounting block 334. The second elastic element 337 is located on the side of the mounting block 334 that is closer to the threaded hole 112. The second elastic element 337 has the elastic force to drive the mounting block 334 to slide in the direction closer to the threaded hole 112, and the surface of the mounting block 334 and the inner wall of the mounting cavity 23 tend to clamp the two sides of the water-absorbing expansion block 336.

[0038] Reference Figure 2 and Figure 3 An inflation channel 24 is provided on the inner wall of the mounting cavity 23 away from the mounting block 334 for the inflation piston 332 to slide. The sliding direction of the inflation piston 332 is parallel to the sliding direction of the mounting block 334. The inflation channel 24 is connected to the inner cavity of the sealing ring bladder 31. One end of the connecting rod 331 is rotatably connected to the surface of the mounting block 334 facing the inflation piston 332. The other end of the connecting rod 331 is rotatably connected to the end of the connecting rod 333. The end of the connecting rod 333 away from the connecting rod 331 is rotatably connected to the end of the inflation piston 332 protruding from the mounting cavity 23. The rotation axis of the connecting rod 331 is perpendicular to the sliding direction of the mounting block 334, and the rotation axis of the connecting rod 331 is perpendicular to the axis of the rotating shaft 4.

[0039] Reference Figure 2 and Figure 3 The elastic element 335 can be a compression spring or a tension spring. In this embodiment, the elastic element 335 is a compression spring with a certain deformation capability. One end of the elastic element 335 in the direction of elastic force is connected to the end face of the inflation piston 332, and the other end of the elastic element 335 in the direction of elastic force is connected to the inner wall of the inflation channel 24. The elastic element 335 has the elastic force to drive the inflation piston 332 to slide towards the mounting cavity 23. The air in the sealing ring bladder 31 enters the inner cavity of the inflation channel 24, the sealing ring bladder 31 depressurizes and contracts, and the ends of the connecting rod 331 and the connecting rod 333 rotatably connect to protrude from the surface of the housing 2.

[0040] Reference Figure 2 and Figure 3 When the cover 11 covers the end face of the housing 2, the end face of the cover 11 abuts against the end of the rotatably connected connecting rod 331 and connecting rod 333 and pushes connecting rod 331 and connecting rod 333 to rotate toward the mounting cavity 23. The rod surfaces of connecting rod 331 and connecting rod 333 are flush with the surface of the housing 2. At the same time, it pushes the inflation piston 332 to slide away from the mounting cavity 23. The air in the inflation channel 24 enters the inner cavity of the sealing ring bladder 31. The surface of the sealing ring bladder 31 is pressurized and expands and squeezes the pressing cavity 322. The inner wall of the pressing cavity is deformed by pressure and pushes the inner ring wall of the pressing ring 32 to press and fix the outer circumference of the ring body 12 to form a seal.

[0041] Reference Figure 2 and Figure 3 When rainwater enters the mounting cavity 23 from the mating surfaces of the cover 11 and the housing 2, the water-absorbing expansion block 336 absorbs water and expands, pushing the mounting block 334 to overcome the elastic force of the second elastic element 337 and slide towards the direction of the inflation channel 24. The first connecting rod 331 and the second connecting rod 333 receive the power of the mounting block 334 and push the inflation piston 332 to slide away from the mounting cavity 23, causing the air in the inflation channel 24 to enter the inner cavity of the sealing ring bladder 31. The sealing ring bladder 31 is pressurized and expands, squeezing the inner wall of the mating cavity 322, further increasing the mating force between the inner wall of the mating ring 32 and the outer circumference of the ring body 12, thereby improving the sealing performance of the motor and realizing the explosion-proof function of the motor.

[0042] Reference Figure 2 and Figure 3 The surface of the housing 2 has a warning cavity 25 for sliding the warning rod 338. In this embodiment, the warning rod 338 is equivalent to a piston. The sliding direction of the warning rod 338 is parallel to the axis of the rotating shaft 4. The warning cavity 25 is connected to the mounting cavity 23. The warning cavity 25 is located on the side of the mounting block 334 away from the water-absorbing expansion block 336. The elastic element 339 can be a compression spring or a tension spring. In this embodiment, the elastic element 339 is a compression spring and has a certain deformation capacity. One end of the elastic element 339 in the elastic direction is connected to the inner wall of the warning cavity 25, and the other end of the elastic element 339 in the elastic direction is connected to the rod surface of the warning rod 338. The elastic element 339 has the elastic force to drive the warning rod 338 to slide towards the mounting cavity 23. One end of the warning rod 338 protrudes from the bottom wall of the mounting cavity 23, and the other end of the warning rod 338 tends to be flush with the surface of the housing 2.

[0043] Reference Figure 2 and Figure 3 The end of the warning rod 338 protruding from the bottom wall of the mounting cavity 23 is provided with a guide surface 3381. The guide surface 3381 is in the shape of a rounded protrusion. When the water-absorbing expansion block 336 absorbs water and expands, the mounting block 334 is pushed by the water-absorbing expansion block 336 and slides along the inner wall of the mounting cavity 23 toward the guide surface 3381. The guide surface 3381 can abut against the bottom surface of the mounting block 334 and push the warning rod 338 to slide away from the mounting cavity 23. The end of the warning rod 338 protrudes from the surface of the housing 2, thereby reminding the user to replace the water-absorbing expansion block 336 in time and improving the ease of use of the motor.

[0044] Reference Figure 2 and Figure 3The inner wall of the sealing cavity 22 near the warning cavity 25 is provided with a compression cavity 26 for the compression plate 3310 to slide. The sliding direction of the compression plate 3310 is parallel to the sliding direction of the inflation piston 332. The compression plate 3310 has multiple deformation grooves 3313 spaced apart on the plate surface facing the pressing ring 32. The inner wall of the deformation groove 3313 can press against the outer ring surface of the pressing ring 32 to form a seal. The deformation groove 3313 provides space for the deformation of the pressing ring 32, so that the pressing ring 32 is uniformly compressed under pressure, avoiding sealing failure caused by excessive compression or local deformation, thereby improving the sealing stability between the inner ring wall of the pressing ring 32 and the outer circumferential surface of the ring body 12.

[0045] Reference Figure 2 and Figure 3 The elastic element 3312 can be a compression spring or a tension spring. In this embodiment, the elastic element 3312 is a compression spring with a certain deformation capability. One end of the elastic element 3312 in the direction of elastic force is connected to the surface of the extrusion plate 3310, and the other end of the elastic element 3312 in the direction of elastic force is connected to the inner wall of the extrusion cavity 26. The elastic element 3312 has the elastic force to drive the extrusion plate 3310 to slide towards the abutting ring 32, and the surface of the extrusion plate 3310 tends to press against the surface of the abutting ring 32.

[0046] Reference Figure 2 and Figure 3 The elastic coefficient of elastic element 4 3312 is less than that of elastic element 2 337. The warning cavity 25 connects the mounting cavity 23 and the compression cavity 26. One end of the connecting rope 3311 is connected to the surface of the mounting block 334 facing the inflation piston 332, and the other end of the connecting rope 3311 is connected to the surface of the compression plate 3310 facing the warning cavity 25. The connecting rope 3311 between the compression plate 3310 and the mounting block 334 is in a taut state.

[0047] Reference Figure 2 and Figure 3 When the water-absorbing expansion block 336 absorbs water and expands, the mounting block 334 is squeezed by the water-absorbing expansion block 336 and slides towards the direction of the airflow channel 24. The connecting rope 3311 between the mounting block 334 and the extrusion plate 3310 is in a relaxed state. The elastic force of the elastic element 3312 drives the extrusion plate 3310 to slide towards the direction of the clamping ring 32. The inner wall of the deformation groove 3313 presses against the outer ring surface of the clamping ring 32 to form a seal, and the connecting rope 3311 between the extrusion plate 3310 and the mounting block 334 is in a taut state, which further improves the clamping force between the inner ring wall of the clamping ring 32 and the outer circumference of the ring body 12.

[0048] The implementation principle of an explosion-proof motor according to an embodiment of this application is as follows: When the cover 11 covers the end face of the housing 2, the ring 12 is embedded in the inner cavity of the housing 2, and the outer circumferential surface of the ring 12 abuts against the inner cavity wall of the housing 2 to form a seal. The rotating shaft 4 on the housing 2 passes through the mounting hole 111, and the first threaded hole 112 corresponds to and communicates with the second threaded hole 21. The end of the bolt passes through the second threaded hole 21 and the first threaded hole 112 and is threaded and fixed to the inner ring wall of the nut, so as to realize the detachable fixation of the cover 11 on the ring 12; at the same time, the end face of the cover 11 abuts against the end of the first connecting rod 331 and the second connecting rod 333 rotatably connected and pushes the first connecting rod 331 and the second connecting rod 333 toward the mounting cavity 23. When the mechanism rotates, the surfaces of connecting rod 1 (331) and connecting rod 2 (333) become flush with the surface of housing 2. Simultaneously, the inflation piston 332 is pushed to slide away from the mounting cavity 23. Air from the inflation channel 24 enters the inner cavity of the sealing ring bladder 31. The surface of the sealing ring bladder 31 is pressurized and expands, squeezing the pressing cavity 322. The inner wall of the pressing cavity is deformed under pressure, pushing the inner ring wall of the pressing ring 32 to press and fix with the outer circumference of the ring body 12 to form a seal. This prevents rainwater from easily entering the inner cavity of housing 2 from the pressing point between housing 2 and ring body 12, avoiding short circuits between windings or between windings and housing 2 due to rainwater. This improves the safety of the motor for the user and extends the service life of the motor.

[0049] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An explosion-proof motor, characterized in that: The device includes a housing (2), an end cap (1), and a sealing device (3). The end cap (1) includes a cover body (11) and a ring body (12). The cover body (11) is connected to the housing (2), and the ring body (12) is connected to the surface of the cover body (11) facing the housing (2). The outer circumferential surface of the ring body (12) abuts against the inner wall of the housing (2) to form a seal. The sealing device (3) includes a sealing ring bladder (31), a pressing ring (32), and an inflation assembly (33). The inner wall of the housing (2) has a sealing cavity (2) for the pressing ring (32) to be embedded. 2) The sealing ring bladder (31) is connected to the inner wall of the sealing cavity (22). The abutment ring (32) has an abutment cavity (322) for the sealing ring bladder (31) to be embedded in. The inflation assembly (33) is connected between the housing (2) and the sealing ring bladder (31). The inflation assembly (33) can inflate the inner cavity of the sealing ring bladder (31). The sealing ring bladder (31) is pressurized and expanded. The sealing ring bladder (31) squeezes the inner wall of the abutment cavity (322), and the inner ring wall of the abutment ring (32) abuts against the outer peripheral surface of the ring body (12) to form a seal.

2. The explosion-proof motor according to claim 1, characterized in that: The inner wall of the clamping ring (32) is coaxially provided with a deformation cavity (321).

3. The explosion-proof motor according to claim 1, characterized in that: The housing (2) has a mounting cavity (23) for accommodating the inflation assembly (33) on the surface facing the cover (11). The inflation assembly (33) includes an inflation piston (332), a connecting rod one (331), a connecting rod two (333), and a mounting block (334). The inner wall of the mounting cavity (23) has an inflation channel (24) for the inflation piston (332) to slide. The inflation channel (24) communicates with the inner cavity of the sealing ring bladder (31). The mounting block (334) is connected to the inner wall of the mounting cavity (23) away from the inflation channel (24). One end of the connecting rod one (331) is rotatably connected to the surface of the mounting block (334) facing the inflation channel (24). The other end of connecting rod 1 (331) is rotatably connected to the end of connecting rod 2 (333). The end of connecting rod 2 (333) away from connecting rod 1 (331) is rotatably connected to the end face of the inflation piston (332). When the cover (11) is connected to the housing (2), the surface of the cover (11) abuts against the rotatably connected ends of connecting rod 1 (331) and connecting rod 2 (333) and pushes connecting rod 1 (331) and connecting rod 2 (333) to rotate toward the mounting cavity (23), causing the inflation piston (332) to slide toward the sealing ring bladder (31), and the end faces of connecting rod 1 (331) and connecting rod 2 (333) are flush with the end face of the housing (2).

4. The explosion-proof motor according to claim 3, characterized in that: The inflation assembly (33) further includes an elastic element (335), one end of which is connected to the inner wall of the inflation channel (24) in the elastic direction, and the other end of which is connected to the surface of the inflation piston (332). The elastic element (335) has the elastic force to drive the inflation piston (332) to slide away from the inflation channel (24), and the ends of the connecting rod (331) and the connecting rod (333) that are rotatably connected tend to protrude from the surface of the housing (2).

5. The explosion-proof motor according to claim 3, characterized in that: The second connecting rod (333) is located on the side of the inflation piston (332) away from the ring (12). The inflation assembly (33) also includes a water-absorbing expansion block (336) and an elastic element (337). The mounting block (334) is slidably connected to the inner wall of the mounting cavity (23). The sliding direction of the mounting block (334) is parallel to the sliding direction of the inflation piston (332). The water-absorbing expansion block (336) is connected to the mounting block (334) away from the first connecting rod. On one side of (331), one end of the elastic element two (337) in the elastic direction is connected to the surface of the mounting block (334), and the other end of the elastic element two (337) in the elastic direction is connected to the inner wall of the mounting cavity (23). The elastic element two (337) has the elastic force to drive the mounting block (334) to slide away from the inflation channel (24), and the inner wall of the mounting cavity (23) and the end face of the mounting block (334) tend to clamp the two sides of the water-absorbing expansion block (336).

6. The explosion-proof motor according to claim 5, characterized in that: The water-absorbing expansion block (336) is connected to an insert (5) on the end face facing the mounting block (334). The surface of the mounting block (334) is provided with a groove (3341) for the insert (5) to be inserted. The end face of the insert (5) abuts against the inner wall of the groove (3341) to form a limit.

7. The explosion-proof motor according to claim 5, characterized in that: The inflation assembly (33) further includes a warning rod (338) and an elastic element (339). A warning cavity (25) for sliding the warning rod (338) is provided on the surface of the housing (2). The sliding direction of the warning rod (338) is perpendicular to the sliding direction of the mounting block (334), and the warning cavity (25) communicates with the mounting cavity (23). The warning cavity (25) is located on the side of the mounting block (334) away from the water-absorbing expansion block (336). One end of the elastic element three (339) in the elastic direction is connected to the inner wall of the warning cavity (25), and the other end of the elastic element three (339) in the elastic direction is connected to the rod surface of the warning rod (338). The elastic element three (339) has the elasticity to drive the warning rod (338) to slide towards the mounting cavity (23). One end of the warning rod (338) protrudes from the bottom wall of the mounting cavity (23), and the other end of the warning rod (338) tends to be flush with the surface of the housing (2).

8. The explosion-proof motor according to claim 7, characterized in that: The end of the warning rod (338) protruding from the bottom wall of the mounting cavity (23) is provided with a guide surface (3381). The guide surface (3381) is in the shape of a circular arc protrusion. The guide surface (3381) can abut against the end face of the mounting block (334) and push the warning rod (338) to slide away from the mounting cavity (23).

9. The explosion-proof motor according to claim 7, characterized in that: The inflation assembly (33) further includes a compression plate (3310), a connecting rope (3311), and an elastic element (3312). The inner wall of the sealed cavity (22) is provided with a compression cavity (26) for the compression plate (3310) to slide. The sliding direction of the compression plate (3310) is parallel to the sliding direction of the inflation piston (332). One end of the elastic element (3312) in the elastic direction is connected to the surface of the compression plate (3310), and the other end in the elastic direction is connected to the inner wall of the compression cavity (26). The elastic element (3312) has the elasticity to drive the compression plate (3310) to slide. 310) Slides towards the clamping ring (32) and the surface of the extrusion plate (3310) tends to press against the surface of the clamping ring (32). The elastic coefficient of the elastic element four (3312) is less than that of the elastic coefficient of the elastic element two (337). The warning cavity (25) connects the mounting cavity (23) and the extrusion cavity (26). One end of the connecting rope (3311) is connected to the surface of the mounting block (334), and the other end of the connecting rope (3311) is connected to the surface of the extrusion plate (3310). The connecting rope (3311) between the extrusion plate (3310) and the mounting block (334) is in a taut state.

10. The explosion-proof motor according to claim 9, characterized in that: The extrusion plate (3310) has a plurality of deformation grooves (3313) spaced apart on the plate surface facing the clamping ring (32), and the inner wall of the deformation groove (3313) abuts against the ring surface of the clamping ring (32) to form a seal.

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