An electric motor

Abstract

The present application relates to a motor, comprising a motor body and a rear cover. A contact ring is fixedly sleeved on the motor body. An annular groove is formed on a side surface of the rear cover facing the sealing ring. When the rear cover moves to contact the contact ring, the annular groove is hermetically arranged. A screw hole for a bolt to pass through is formed on the rear cover. A first channel and a second channel are formed in the housing. Two ends of the first channel are respectively communicated with the annular groove and the screw hole. One end of the second channel is communicated with the annular groove. The other end of the second channel is communicated with the outside and is close to the air inlet of the rear cover. A one-way valve is arranged in the second channel to only allow the gas in the annular groove to flow to the outside. When an operator installs the rear cover on the motor body, the only bolt blocks the screw hole while connecting the motor body. Since the air flow rate at the air inlet is relatively large, the air in the annular groove flows out to the outside through the one-way valve, and the atmospheric pressure around the rear cover can better cover the rear cover on the motor body.

Description

Technical Field

[0001] This application relates to the field of motors, and in particular to a motor. Background Art

[0002] A motor refers to an electromagnetic device that realizes the conversion or transmission of electrical energy based on the law of electromagnetic induction. Its main function is to generate a driving torque and serve as a power source for electrical appliances or various machines.

[0003] The utility model patent with the publication number CN207819629U discloses an intelligent reduction motor, whose structure includes a support plate, a small electric box, a base, a support rod, a rear cover, fixed screw holes, hanging holes, a fixed valve block, a sealing ring, a rotating rod, and a machine body. The rear cover is embedded and installed on the machine body. The fixed screw holes and the rear cover are an integrated structure. The hanging holes are arranged on the machine body. The fixed valve block and the machine body are an integrated structure. The sealing ring is fitted with the machine body. The machine body includes a rotor, a front bearing, a stator, a pressure spring, a brake wheel, and a rear bearing.

[0004] The above-mentioned related technical solutions have the following defects: The rear cover usually protects the cooling fan of the motor. When the cooling fan needs to be repaired, the operator needs to remove the bolts in a circle of multiple fixed screw holes on the rear cover to remove the rear cover. The whole process of removing and installing the rear cover is rather troublesome. Summary of the Invention

[0005] In order to facilitate the disassembly and installation of the motor rear cover, this application provides a motor.

[0006] A motor provided by this application adopts the following technical solution:

[0007] A motor includes a motor body and a rear cover detachably connected to the motor body. A contact ring is fixedly sleeved on the motor body. The rear cover is slidably connected to the motor body along the direction parallel to the axis of the contact ring. A sealing ring is coaxially fixed on the side surface of the contact ring facing the rear cover. A sealing groove matching the sealing ring is opened on the side surface of the rear cover facing the sealing ring. An annular groove is opened on the side surface of the rear cover facing the sealing ring. The sealing groove surrounds the annular groove. When the rear cover moves to abut against the contact ring, the sealing ring is embedded in the sealing groove, and the annular groove is hermetically arranged. A bolt is connected to the rear cover, and a screw hole for the bolt to pass through is opened on the rear cover. One end of the bolt passes through the screw hole and is threadedly connected to the motor body;

[0008] A first channel and a second channel are formed inside the housing. Two ends of the first channel are respectively communicated with the annular groove and the screw hole. One end of the second channel is communicated with the annular groove, and the other end of the second channel is communicated with the outside and is close to the air outlet of the rear cover. A one-way valve is arranged in the second channel to only allow the gas in the annular groove to flow to the outside. After the rear cover is fixed to the motor body by the bolt, one end of the first channel away from the annular groove is not communicated with the outside.

[0009] By adopting the above technical solution, when the operator installs the rear cover on the motor body, only one bolt needs to be installed. After the rear cover is installed on the motor body, this only bolt simultaneously blocks the screw hole, so that the annular groove can only be communicated with the second channel. Since the other end of the second channel away from the annular groove is close to the air outlet of the rear cover, and the air flow rate at the air outlet is relatively large, the air pressure at the air outlet will be small. At this time, the air pressure in the annular groove is greater than the air pressure at the air outlet, and the air in the annular groove flows out to the outside through the one-way valve. The reduction of the air in the annular groove leads to the reduction of the air pressure, and the atmospheric pressure around the rear cover can better cover the rear cover on the motor body.

[0010] Preferably, it further includes a first driving member, a first spring and a cooling fan. The cooling fan includes a rotating shaft and a plurality of blades. The rotating shaft includes a first shaft and a second shaft arranged coaxially. The first shaft is rotatably connected to the rear cover, and a plurality of blades are uniformly fixed on the outer wall of the first shaft along the circumferential direction of the first shaft. The second shaft is always slidably connected to the first shaft along the axial direction of the first shaft. A main shaft is rotatably connected inside the motor body. The first spring is arranged on the first shaft and the second shaft and drives the second shaft to move towards the side close to the main shaft. A single key is arranged on the outer wall of the second shaft, and an axial key groove matching the second shaft and the single key is formed on the end face of the main shaft close to the rear cover. The first driving member drives the rotating shaft to rotate. When the rear cover is completely installed on the motor body, the rotating shaft is coaxially arranged with the main shaft, and the second shaft and the single key extend into the axial key groove.

[0011] By adopting the above technical solution, by arranging the cooling fan on the rear cover, the cooling fan can be installed on the main shaft while the rear cover is installed. Under the action of the first spring, the second shaft always moves towards the main shaft side until it abuts against the main shaft. The first shaft and the second shaft are driven by the first driving member to rotate, so that the second shaft and the single key rotate to face the axial key groove, and then under the action of the first spring, the second shaft and the single key can completely extend into the axial key groove, thereby realizing the connection between the second shaft and the main shaft.

[0012] Preferably, the first driving member includes a roller and a linkage member. The roller is rotatably connected to the rear cover. During the process of installing the rear cover on the motor body, the roller is used to abut against the outer wall of the motor body and rotate following the movement of the rear cover. During the process of installing the rear cover on the motor body, the roller drives the first shaft to rotate through the linkage member.

[0013] By adopting the above technical solution, during the process of installing the rear cover on the motor body, the roller abuts against the motor body and moves along with the movement of the rear cover. At this time, the roller can rotate, and then the rotating roller drives the first shaft to rotate through the linkage member.

[0014] Preferably, the linkage member includes a first rod, a second rod, a third rod, a first transmission belt, a first bevel gear, a second bevel gear, an internal ratchet gear and a second transmission belt. The first rod and the second rod are rotatably connected to the rear cover along a direction perpendicular to the axis of the first shaft. The first rod is coaxially and fixedly connected to the roller. The first transmission belt is wound around the first rod and the second rod. The third rod is rotatably connected to the rear cover along a direction parallel to the axis of the first shaft. The first bevel gear is coaxially and fixedly connected to the second rod. The second bevel gear is coaxially and fixedly connected to the third rod. The first bevel gear is meshed with the second bevel gear. The internal ratchet gear is coaxially installed on the third rod. The second transmission belt is wound around the internal ratchet gear and the first shaft. When the roller rotates, the third rod drives the first shaft to rotate through the internal ratchet gear. When the first shaft rotates, the first shaft cannot drive the third rod to rotate through the internal ratchet gear.

[0015] By adopting the above technical solution, after the roller rotates, the second rod is driven to rotate through the first rod and the first transmission belt. The second rod drives the third rod to rotate through the meshing of the first bevel gear and the second bevel gear. The third rod drives the first shaft to rotate through the internal ratchet gear and the second transmission belt, so that the second shaft can be automatically connected to the main shaft. At this time, the rotation direction of the second shaft is set as the first rotation direction. When the motor runs, the rotation direction of the main shaft will be opposite to the first rotation direction. The rotation of the main shaft drives the first shaft and the second shaft to rotate. The rotation of the first shaft cannot drive the third rod to rotate through the internal ratchet gear, so the operation of the motor does not affect the rotation of the roller.

[0016] Preferably, it further includes a second driving member. The blade includes a fixed piece and a moving piece. A plurality of fixed pieces are uniformly fixed on the outer wall of the first shaft along the circumferential direction of the first shaft. A hidden groove is formed on the end surface of the fixed piece away from the first shaft. The moving piece is slidably connected in the hidden groove along a direction perpendicular to the axis of the first shaft. The second driving member is used to drive the moving piece to slide in the hidden groove.

[0017] By adopting the above technical solution, for motors with different powers, blades of different sizes need to be selected. The second driving member drives the moving piece to slide in the hidden groove to change the length of the blade. For some low-power motors, by appropriately adjusting the length of the blade, the load brought by the blade to the motor can be reduced on the premise of meeting the heat dissipation requirements, thereby reducing the power consumption of the motor.

[0018] Preferably, the second driving member includes a preliminary locking device and a complete locking device. The preliminary locking device includes a turntable, a plurality of second springs and a plurality of pulling ropes. The plurality of second springs respectively correspond to a plurality of hidden grooves. The second springs are located in the hidden grooves and drive the moving pieces to always move away from the fixed piece. The turntable is coaxially sleeved and rotatably connected to the first shaft. The plurality of pulling ropes respectively correspond to the plurality of moving pieces. Two ends of each pulling rope are respectively fixed on the corresponding moving piece and the turntable. The turntable is provided with ridges in the circumferential direction in sequence. A plurality of grooves which are in clamping fit with the ridges are formed on the fixed piece or the first shaft. When the first shaft stops rotating and the ridges are embedded into the corresponding grooves, the moving pieces are in a static state. The complete locking device is used to completely lock the positions of the moving pieces in the hidden grooves during the rotation of the first shaft.

[0019] By adopting the above technical solution, an operator rotates the turntable. The rotation of the turntable drives the plurality of pulling ropes to pull the moving pieces to move. When the moving pieces move to appropriate positions, the ridges are clamped on the corresponding grooves. At this time, without external force, the moving pieces remain stationary. Through the preliminary locking of the turntable, it is convenient for the operator to rotate the turntable at any time to adjust the positions of the moving pieces.

[0020] Preferably, the complete locking device includes a plurality of locking blocks and a plurality of third springs. A plurality of first grooves are formed on the outer wall of the first shaft in the circumferential direction. The plurality of locking blocks respectively correspond to the plurality of first grooves. The locking blocks are slidably connected in the corresponding first grooves along the direction perpendicular to the axis of the first shaft. The plurality of third springs are respectively arranged on the plurality of locking blocks. When the first shaft stops rotating, the third springs drive the locking blocks to always be located in the first grooves.

[0021] A plurality of locking grooves are formed on the turntable. The locking grooves are used for the ends of the locking blocks to extend into. When the ridges are embedded into the corresponding grooves, the locking blocks are opposite to the locking grooves. During the rotation of the first shaft, the locking blocks extend into the locking grooves.

[0022] By adopting the above technical solution, when the main shaft drives the first shaft to rotate, the locking blocks will move into the corresponding locking grooves under the action of centrifugal force, overcoming the elastic force of the third springs, so as to realize the complete locking of the turntable.

[0023] Preferably, the end of the locking block close to the locking groove is tapered from far away from the locking groove to close to the locking groove.

[0024] By adopting the above technical solution, by setting the end of the locking block to be tapered, the locking block can enter the locking groove better.

[0025] In summary, the present application includes at least one of the following beneficial technical effects:

[0026] By setting the annular groove, the first channel and the second channel, when the operator installs the rear cover on the motor body, only one bolt needs to be installed. This unique bolt blocks the screw hole, making the annular groove only communicate with the second channel. Since the end of the second channel far from the annular groove is close to the air outlet of the rear cover, and the air flow velocity at the air outlet is relatively large, the air in the annular groove flows out to the outside through the one-way valve. The reduction of the air in the annular groove leads to a decrease in air pressure, and the atmospheric pressure around the rear cover can better close the rear cover on the motor body.

[0027] By setting the moving piece and the fixed piece, different-sized blades need to be selected for motors with different powers. The second driving part drives the moving piece to slide in the hidden groove to change the length of the blade. For some low-power motors, by appropriately adjusting the length of the blade, the load brought by the blade to the motor can be reduced on the premise of meeting the heat dissipation requirements, thereby reducing the power consumption of the motor. Description of the Drawings

[0028] Figure 1 is the overall structural schematic diagram of the embodiment of the present application.

[0029] Figure 2 is the connection schematic diagram of the rear cover and the motor body of the embodiment of the present application.

[0030] Figure 3 is along Figure 1 the cross-sectional view taken along the line a-a in

[0031] Figure 4 is Figure 3 the enlarged view of part A in

[0032] Figure 5 is Figure 2 the enlarged view of part B in

[0033] Figure 6 is along Figure 1 the cross-sectional view taken along the line b-b in

[0034] Figure 7 is Figure 6 the enlarged view of part C in

[0035] Description of reference numerals: 1. Motor body; 11. Main shaft; 111. Shaft keyway; 12. Abutted ring; 121. Sealing ring; 13. Moving groove; 2. Rear cover; 211. Sealing groove; 212. Annular groove; 213. Screw hole; 2131. Bolt; 2132. Sealing gasket; 221. First channel; 222. Second channel; 23. Moving block; 3. Cooling fan; 31. Rotating shaft; 311. First shaft; 3111. First sliding groove; 3112. First groove; 312. Second shaft; 3121. First slider; 3122. Single key; 32. Blade; 321. Fixed piece; 3211. Hidden groove; 322. Moving piece; 33. First spring; 34. Driving member II; 35. Preliminary locking device; 351. Turntable; 3511. Ridge; 3512. Locking groove; 352. Second spring; 353. Pulling rope; 36. Complete locking device; 361. Locking block; 362. Third spring; 37. Avoidance groove; 4. Driving member I; 41. Roller; 42. Linking member; 421. First rod; 422. Second rod; 423. Third rod; 424. First transmission belt; 425. First bevel gear; 426. Second bevel gear; 427. Internal ratchet gear; 4271. Inner wheel; 4272. Outer ratchet; 4273. Elastic piece; 4274. Pawl; 428. Second transmission belt. Detailed implementation manners

[0036] The following further describes the present application in detail with reference to the attached Figures 1-7 drawings.

[0037] An embodiment of the present application discloses a motor.

[0038] Referring to Figure 1 and Figure 2 , a motor in this embodiment includes a motor body 1 and a rear cover 2 detachably connected to one end of the motor body 1. A main shaft 11 is rotatably connected to the motor body 1. The motor body 1 is cylindrical, and the motor body 1 and the main shaft 11 are coaxially arranged. An abutted ring 12 is coaxially and fixedly sleeved at one end of the motor body 1 close to the rear cover 2. A moving block 23 is fixed on the inner wall of the rear cover 2. A moving groove 13 matching the moving block 23 is formed on the outer wall of the motor body 1. The rear cover 2 is slidably connected to the motor body 1 along the axial direction parallel to the axis of the abutted ring 12 through the cooperation of the moving block 23 and the moving groove 13. When the rear cover 2 is completely installed on the motor body 1, the side surfaces of the rear cover 2 and the abutted ring 12 facing each other are abutted and attached together.

[0039] Referring to Figure 1 and Figure 2, in order to increase the connection strength between the rear cover 2 and the abutting ring 12, a sealing ring 121 is coaxially fixed on the side surface of the abutting ring 12 facing the rear cover 2, and a sealing groove 211 matching the sealing ring 121 is formed on the side surface of the rear cover 2 facing the sealing ring 121. An annular groove 212 is also formed on the side surface of the rear cover 2 facing the sealing ring 121. The annular groove 212 is coaxially arranged with the sealing groove 211, and the sealing groove 211 surrounds the annular groove 212. When the rear cover 2 moves to abut against the abutting ring 12, the sealing ring 121 is embedded in the sealing groove 211, and at this time, the annular groove 212 is in a sealed state.

[0040] Refer to Figure 3 , Figure 4 , a bolt 2131 is connected to the rear cover 2, and a screw hole 213 for the bolt 2131 to pass through is formed on the outer wall of the rear cover 2. One end of the bolt 2131 passes through the screw hole 213 and is threadedly connected to the motor body 1. For the heat dissipation of the motor, the end of the rear cover 2 away from the motor body 1 is the air outlet and is in a hollow shape. A first channel 221 and a second channel 222 are formed in the housing. The two ends of the first channel 221 are respectively communicated with the annular groove 212 and the screw hole 213. One end of the second channel 222 is communicated with the annular groove 212, and the other end of the second channel 222 is communicated with the outside and is close to the air outlet of the rear cover 2. A one-way valve is provided in the second channel 222 to only allow the gas in the annular groove 212 to flow to the outside. After the bolt 2131 fixes the rear cover 2 to the motor body 1, the bolt 2131 plugs the screw hole 213, and the end of the first channel 221 away from the annular groove 212 is not communicated with the outside. In order to enable the bolt 2131 to better plug the screw hole 213, a sealing gasket 2132 is fixed on the end of the bolt 2131 to plug the screw hole 213.

[0041] Refer to Figure 3 , Figure 4 , when the operator installs the rear cover 2 on the motor body 1, only one bolt 2131 needs to be installed. After the rear cover 2 is installed on the motor body 1, this only bolt 2131 plugs the screw hole 213 at the same time, so that the annular groove 212 can only be communicated with the second channel 222. Since the end of the second channel 222 away from the annular groove 212 is close to the air outlet of the rear cover 2, and the air flow rate at the air outlet is relatively large, the air pressure at the air outlet will be small. At this time, the air pressure in the annular groove 212 is greater than the air pressure at the air outlet, and the air in the annular groove 212 flows out to the outside through the one-way valve. The reduction of the air in the annular groove 212 leads to a decrease in air pressure, and the atmospheric pressure around the rear cover 2 can better cover the rear cover 2 on the motor body 1.

[0042] Refer to Figure 3 , Figure 4, a heat dissipation fan 3 is connected to the rear cover 2. The heat dissipation fan 3 includes a rotating shaft 31 and a plurality of blades 32. The rotating shaft 31 includes a first shaft 311 and a second shaft 312 that are coaxially arranged with each other. One end of the first shaft 311 is rotatably connected to the end of the rear cover 2 that is far from the motor body 1, and the plurality of blades 32 are uniformly fixed on the outer wall of the first shaft 311 along the circumferential direction of the first shaft 311. The first shaft 311 is located on one side of the main shaft 11 in the length direction. When the rear cover 2 is installed on the motor body 1, the first shaft 311 is coaxially arranged with the main shaft 11.

[0043] Refer to Figure 1 , the motor body 1 is self-provided with a gap channel, and the wind generated by the heat dissipation fan 3 can reach the heat sink of the motor body 1 through the gap channel. The setting of the rear cover 2 will not affect the heat dissipation of the motor body.

[0044] Refer to Figure 3 , Figure 4 , a first sliding groove 3111 is formed on the end face of one end of the first shaft 311 facing the main shaft 11. In order to prevent rotation between the first shaft 311 and the second shaft 312, a first sliding block 3121 is fixed on the outer wall of the second shaft 312, and the first shaft 311 and the first sliding block 3121 are slidably connected to the first sliding groove 3111 along the axial direction of the first shaft 311. A first spring 33 is arranged in the first sliding groove 3111, and both ends of the first spring 33 are respectively fixed on the bottom wall of the first sliding groove 3111 and the second shaft 312. The first spring 33 is always in a compressed state and drives the second shaft 312 to move towards the side close to the main shaft 11.

[0045] Refer to Figure 2 , Figure 4 , in order to connect the second shaft 312 to the main shaft 11 and rotate with the main shaft 11, a single key 3122 is fixed on the outer wall of the second shaft 312, and a shaft key groove 111 matching the second shaft 312 and the single key 3122 is formed on the end face of one end of the main shaft 11 close to the rear cover 2. A first driving member 4 is arranged on the rear cover 2, and the first driving member 4 drives the first shaft 311 to rotate. During the process of installing the rear cover 2 on the motor body 1, the rotating shaft 31 and the main shaft 11 always maintain a coaxial setting. Under the action of the first spring 33, the second shaft 312 always moves towards the main shaft 11 until it abuts against the main shaft 11. By driving the first shaft 311 and the second shaft 312 to rotate through the first driving member 4, the second shaft 312 and the single key 3122 are rotated to face the shaft key groove 111, and then under the action of the first spring 33, the second shaft 312 and the single key 3122 can completely extend into the shaft key groove 111, thereby realizing the connection between the second shaft 312 and the main shaft 11.

[0046] Refer to Figure 3 , Figure 5, the first driving member 4 includes a roller 41 and a linkage member 42. The roller 41 is rotatably connected to the rear cover 2, and the rotation axis direction of the roller 41 is perpendicular to the axis direction of the first shaft 311. When the rear cover 2 is installed on the motor body 1, the roller 41 is used to abut against the outer wall of the motor body 1 and rotate following the movement of the rear cover 2. At the same time, the roller 41 can drive the first shaft 311 to rotate through the linkage member 42.

[0047] Refer to Figure 3 , Figure 5 , the linkage member 42 includes a first rod 421, a second rod 422, a third rod 423, a first transmission belt 424, a first bevel gear 425, a second bevel gear 426, an internal ratchet gear 427 and a second transmission belt 428. The first rod 421 and the second rod 422 are rotatably connected inside the rear cover 2. The first rod 421 is coaxially and fixedly connected to the roller 41. The rotation axis direction of the second rod 422 is parallel to the rotation axis direction of the first rod 421. The first transmission belt 424 is wound around the first rod 421 and the second rod 422. The third rod 423 is rotatably connected to the rear cover 2 along the axis direction parallel to the first shaft 311. The first bevel gear 425 is coaxially and fixedly connected to the second rod 422. The second bevel gear 426 is coaxially and fixedly connected to the third rod 423. The first bevel gear 425 is meshed and connected to the second bevel gear 426.

[0048] Refer to Figure 3 , Figure 5 , the internal ratchet gear 427 includes an inner wheel 4271, an outer ratchet 4272, an elastic piece 4273 and a pawl 4274. The inner wheel 4271 is coaxially and fixedly connected to the third rod 423. The outer ratchet 4272 is rotatably connected to the inner wheel 4271. The ratchet teeth of the outer ratchet 4272 face the inner wheel 4271 side. The elastic piece 4273 is fixed to the inner wheel 4271 and the pawl 4274. The elastic piece 4273 drives the pawl 4274 to move towards the outer ratchet 4272 side and be meshed and connected to the ratchet. The internal ratchet gear 427 can only achieve one-way rotation. When the roller 41 rotates, the third rod 423 drives the first shaft 311 to rotate through the internal ratchet gear 427. When the first shaft 311 rotates, the first shaft 311 cannot drive the third rod 423 to rotate through the internal ratchet gear 427.

[0049] Refer to Figure 3 , Figure 5During the installation of the rear cover 2 on the motor body 1, the roller 41 abuts against the outer wall of the motor body 1 and rotates following the movement of the rear cover 2. The first rod 421 and the first transmission belt 424 drive the second rod 422 to rotate. The second rod 422 drives the third rod 423 to rotate through the meshing of the first bevel gear 425 and the second bevel gear 426. The third rod 423 drives the first shaft 311 to rotate through the internal ratchet gear 427 and the second transmission belt 428, enabling the second shaft 312 to be automatically connected to the main shaft 11. At this time, the rotation direction of the second shaft 312 is the first rotation direction. When the motor is running, the rotation direction of the main shaft 11 is opposite to the first rotation direction. The rotation of the main shaft 11 drives the first shaft 311 and the second shaft 312 to rotate. The rotation of the first shaft 311 cannot drive the third rod 423 to rotate through the internal ratchet gear 427, so the operation of the motor does not affect the rotation of the roller 41.

[0050] Refer to Figure 6 、 Figure 7 The blade 32 includes a fixed piece 321 and a movable piece 322. One end of a plurality of fixed pieces 321 is uniformly fixed on the outer wall of the first shaft 311 along the circumferential direction of the first shaft 311. A hidden groove 3211 is formed on the end face of the fixed piece 321 away from the first shaft 311. The movable piece 322 is slidably connected in the hidden groove 3211 along the direction perpendicular to the axis of the first shaft 311. A second driving member 34 is provided on the first shaft 311, and the second driving member 34 is used to drive the movable piece 322 to slide in the hidden groove 3211.

[0051] Refer to Figure 2 、 Figure 7 For motors with different powers, blades 32 of different sizes need to be selected. The second driving member 34 drives the movable piece 322 to slide in the hidden groove 3211 to change the length of the blade 32. For some low-power motors, by appropriately adjusting the length of the blade 32, the load brought by the blade 32 to the motor can be reduced on the premise of meeting the heat dissipation requirements, thereby reducing the power consumption of the motor.

[0052] Refer to Figure 6 、 Figure 7 The second driving member 34 includes a preliminary locking device 35 and a complete locking device 36. The preliminary locking device 35 includes a turntable 351, a plurality of second springs 352 and a plurality of pull ropes 353. The plurality of second springs 352 respectively correspond to the plurality of hidden grooves 3211. The second springs 352 are located in the corresponding hidden grooves 3211. The two ends of the second spring 352 are respectively fixedly connected to the bottom wall of the hidden groove 3211 and the side surface of the movable piece 322 facing the bottom wall of the hidden groove 3211. When there is no external force, the movable piece 322 mostly extends out of the hidden groove 3211 under the action of the second spring 352.

[0053] Refer to Figure 2 、Figure 7 The turntable 351 is coaxially sleeved and rotatably connected to the first shaft 311. A plurality of pulling ropes 353 respectively correspond to a plurality of moving pieces 322. One end of the pulling rope 353 is fixed on the outer wall of the turntable 351, and the other end of the pulling rope 353 extends from the inside of the fixing piece 321 to the hidden groove 3211 and is fixed on the moving piece 322. In order to enable the pulling rope 353 to operate in the same vertical plane as much as possible, avoiding grooves 37 are provided at corresponding positions on the fixing piece 321 for the turntable 351 to rotate. On the side surface of the turntable 351 away from the motor body 1, protrusions 3511 are sequentially fixed along the circumferential direction. A plurality of grooves that are engaged with the protrusions 3511 are provided at corresponding positions on the inner wall of the avoiding groove 37. When the protrusions 3511 are engaged in the corresponding grooves and the first shaft 311 of the motor just starts to rotate, the moving pieces 322 can all remain stationary. The complete locking device 36 is used to completely lock the position of the moving pieces 322 in the hidden groove 3211 during the rotation of the first shaft 311.

[0054] Refer to Figure 2 、 Figure 7 As shown in, the operator rotates the turntable 351. The rotation of the turntable 351 drives a plurality of pulling ropes 353 to pull the moving pieces 322 to move. When the moving pieces 322 move to appropriate positions, the protrusions 3511 are engaged in the corresponding grooves. At this time, without external force, the moving pieces 322 remain stationary. Through the preliminary locking of the turntable 351, the operator can conveniently rotate the turntable 351 at any time to adjust the positions of the moving pieces 322.

[0055] Refer to Figure 6 、 Figure 7 As shown in, the complete locking device 36 includes a plurality of locking blocks 361 and a plurality of third springs 362. A plurality of first grooves 3112 are provided on the outer wall of the first shaft 311 along the circumferential direction of the first shaft 311. The plurality of locking blocks 361 respectively correspond to the plurality of first grooves 3112. The locking blocks 361 are slidably connected in the corresponding first grooves 3112 along the direction perpendicular to the axis of the first shaft 311. The plurality of third springs 362 respectively correspond to the plurality of first grooves 3112. The third springs 362 are located in the corresponding first grooves 3112. The two ends of the third springs 362 are respectively fixedly connected to the bottom wall of the first groove 3112 and the corresponding locking blocks 361.

[0056] Refer to Figure 6 、 Figure 7, on one side of the turntable 351 facing the first shaft 311, a plurality of locking grooves 3512 are circumferentially formed. The number of the locking grooves 3512 is more than that of the locking blocks 361. The locking grooves 3512 are used for the ends of the locking blocks 361 away from the third spring 362 to extend into. When the convex strip 3511 is embedded into the corresponding groove, the locking block 361 is always facing a certain locking groove 3512. The end of the locking block 361 close to the locking groove 3512 is tapered from away from the locking groove 3512 to close to the locking groove 3512.

[0057] Refer to Figure 2 , Figure 7 , when the first shaft 311 stops rotating or rotates at a relatively low speed, the third spring 362 drives the locking block 361 to always be located in the first groove 3112. When the first shaft 311 rotates normally, the locking block 361 will move into the corresponding locking groove 3512 under the action of centrifugal force, overcoming the elastic force of the third spring 362, realizing the complete locking of the turntable 351.

[0058] The implementation principle of an electric motor in an embodiment of the present application is as follows: When an operator installs the rear cover 2 on the motor body 1, only one bolt 2131 needs to be installed. After the rear cover 2 is installed on the motor body 1, this unique bolt 2131 simultaneously blocks the screw hole 213, so that the annular groove 212 can only communicate with the second channel 222. Since one end of the second channel 222 away from the annular groove 212 is close to the air outlet of the rear cover 2, and the air flow rate at the air outlet is relatively large, resulting in a low air pressure at the air outlet. At this time, the air pressure in the annular groove 212 is greater than the air pressure at the air outlet, and the air in the annular groove 212 flows out to the outside through the one-way valve. The reduction of the air in the annular groove 212 leads to a decrease in air pressure, and the atmospheric pressure around the rear cover 2 can better cover the rear cover 2 on the motor body 1. At the same time, during the installation of the rear cover 2, the cooling fan 3 can be automatically connected to the main shaft 11 simultaneously.

[0059] The above are all preferred embodiments of the present application. The protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A motor, comprising a motor body (1) and a rear cover (2) detachably connected to the motor body (1), characterized in that: A contact ring (12) is fixedly sleeved on the motor body (1). The rear cover (2) is slidably connected to the motor body (1) along a direction parallel to the axis of the contact ring (12). A sealing ring (121) is coaxially fixed on a side surface of the contact ring (12) facing the rear cover (2). A sealing groove (211) matching the sealing ring (121) is formed on a side surface of the rear cover (2) facing the sealing ring (121). A circular groove (212) is formed on a side surface of the rear cover (2) facing the sealing ring (121). The sealing groove (211) surrounds the circular groove (212). When the rear cover (2) moves to abut against the contact ring (12), the sealing ring (121) is embedded in the sealing groove (211). The circular groove (212) is hermetically arranged. A bolt (2131) is connected to the rear cover (2). A screw hole (213) for the bolt (2131) to pass through is formed on the rear cover (2). One end of the bolt (2131) passes through the screw hole (213) and is threadedly connected to the motor body (1); A first channel (221) and a second channel (222) are formed in the rear cover (2). Two ends of the first channel (221) are respectively communicated with an annular groove (212) and a threaded hole (213). One end of the second channel (222) is communicated with the annular groove (212), and the other end of the second channel (222) is communicated with the outside and is close to the air outlet of the rear cover (2). A one-way valve is arranged in the second channel (222) to only allow the gas in the annular groove (212) to flow to the outside. After the rear cover (2) is fixed to the motor body (1) by a bolt (2131), one end of the first channel (221) away from the annular groove (212) is not communicated with the outside. It further includes a first driving member (4), a first spring (33) and a cooling fan (3). The cooling fan (3) includes a rotating shaft (31) and a plurality of blades (32). The rotating shaft (31) includes a first shaft (311) and a second shaft (312) arranged coaxially. The first shaft (311) is rotatably connected to the rear cover (2). The plurality of blades (32) are uniformly fixed on the outer wall of the first shaft (311) along the circumferential direction of the first shaft (311). The second shaft (312) is always slidably connected to the first shaft (311) along the axial direction of the first shaft (311). A main shaft (11) is rotatably connected in the motor body (1). The first spring (33) is arranged on the first shaft (311) and the second shaft (312) and drives the second shaft (312) to move towards the side close to the main shaft (11). A single key (3122) is arranged on the outer wall of the second shaft (312). An axial key groove (111) matching the second shaft (312) and the single key (3122) is formed on the end face of one end of the main shaft (11) close to the rear cover (2). The first driving member (4) drives the rotating shaft (31) to rotate. When the rear cover (2) is completely installed on the motor body (1), the rotating shaft (31) is coaxially arranged with the main shaft (11), and the second shaft (312) and the single key (3122) extend into the axial key groove (111).

2. A motor according to claim 1, characterized in that: The first driving member (4) includes a roller (41) and a linkage member (42). The roller (41) is rotatably connected to the rear cover (2). During the process of installing the rear cover (2) on the motor body (1), the roller (41) is used to abut against the outer wall of the motor body (1) and rotate following the movement of the rear cover (2). During the process of installing the rear cover (2) on the motor body (1), the roller (41) drives the first shaft (311) to rotate through the linkage member (42).

3. A motor according to claim 2, wherein: The linkage member (42) includes a first rod (421), a second rod (422), a third rod (423), a first transmission belt (424), a first bevel gear (425), a second bevel gear (426), an internal ratchet gear (427) and a second transmission belt (428). The first rod (421) and the second rod (422) are rotatably connected to the rear cover (2) in a direction perpendicular to the axis of the first shaft (311). The first rod (421) is coaxially and fixedly connected to the roller (41). The first transmission belt (424) is wound around the first rod (421) and the second rod (422). The third rod (423) is rotatably connected to the rear cover (2) in a direction parallel to the axis of the first shaft (311). The first bevel gear (425) is coaxially and fixedly connected to the second rod (422). The second bevel gear (426) is coaxially and fixedly connected to the third rod (423). The first bevel gear (425) is meshed with the second bevel gear (426). The internal ratchet gear (427) is coaxially mounted on the third rod (423). The second transmission belt (428) is wound around the internal ratchet gear (427) and the first shaft (311). When the roller (41) rotates, the third rod (423) drives the first shaft (311) to rotate through the internal ratchet gear (427). When the first shaft (311) rotates, the first shaft (311) cannot drive the third rod (423) to rotate through the internal ratchet gear (427).

4. A motor according to claim 1, characterized in that: It further includes a second driving member (34). The blade (32) includes a fixed piece (321) and a moving piece (322). A plurality of fixed pieces (321) are uniformly fixed on the outer wall of the first shaft (311) in the circumferential direction of the first shaft (311). A hidden groove (3211) is formed at the end face of the fixed piece (321) away from the first shaft (311). The moving piece (322) is slidably connected in the hidden groove (3211) in a direction perpendicular to the axis of the first shaft (311). The second driving member (34) is used to drive the moving piece (322) to slide in the hidden groove (3211).

5. A motor according to claim 4, characterized in that: The second driving member (34) includes a preliminary locking device (35) and a complete locking device (36). The preliminary locking device (35) includes a turntable (351), a plurality of second springs (352) and a plurality of pull ropes (353). The plurality of second springs (352) respectively correspond to a plurality of hidden grooves (3211). The second springs (352) are located in the hidden grooves (3211) and drive the moving piece (322) to always move away from the fixed piece (321). The turntable (351) is coaxially sleeved and rotatably connected to the first shaft (311). The plurality of pull ropes (353) respectively correspond to the plurality of moving pieces (322). Two ends of the pull rope (353) are respectively fixed on the corresponding moving piece (322) and the turntable (351). The turntable (351) is sequentially provided with ridges (3511) along the circumferential direction. A plurality of grooves for snap-fitting with the ridges (3511) are formed on the fixed piece (321) or the first shaft (311). When the first shaft (311) stops rotating and the ridge (3511) is embedded in the corresponding groove, the moving piece (322) is in a static state. The complete locking device (36) is used to completely lock the position of the moving piece (322) in the hidden groove (3211) during the rotation of the first shaft (311).

6. The motor according to claim 5, characterized in that: The complete locking device (36) includes a plurality of locking blocks (361) and a plurality of third springs (362). A plurality of first grooves (3112) are formed on the outer wall of the first shaft (311) along the circumferential direction. The plurality of locking blocks (361) respectively correspond to the plurality of first grooves (3112). The locking blocks (361) are slidably connected in the corresponding first grooves (3112) along the direction perpendicular to the axis of the first shaft (311). The plurality of third springs (362) are respectively arranged on the plurality of locking blocks (361). When the first shaft (311) stops rotating, the third springs (362) drive the locking blocks (361) to always be located in the first grooves (3112). A plurality of locking grooves (3512) are formed on the turntable (351). The locking grooves (3512) are used for the ends of the locking blocks (361) to extend into. When the ridge (3511) is embedded in the corresponding groove, the locking blocks (361) are opposite to the locking grooves (3512). During the rotation of the first shaft (311), the locking blocks (361) extend into the locking grooves (3512).

7. A motor according to claim 6, characterized in that: The end of the locking block (361) close to the locking groove (3512) is tapered from far away from the locking groove (3512) to close to the locking groove (3512).

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