A high-voltage and high-efficiency medium-sized three-phase asynchronous motor

Abstract

The present invention relates to the field of motor technology, and discloses a high-voltage and high-efficiency medium-sized three-phase asynchronous motor, comprising: a housing, a rotor, an end cover and a dust cover, a rear bearing is installed at one end of the rotor, the end cover and the dust cover are both installed at the same end of the housing, and the end cover is located on the inner side of the dust cover, the housing overlaps with the connecting end of the end cover and the dust cover, and a gap is left between the outer ring surface of the rear bearing and the inner side wall of the end cover. The present invention can fix the dust cover, the end cover and the rear bearing at the same time by setting a mounting mechanism. When the position of the rear bearing is inspected and maintained, the fixing effect of the dust cover, the end cover and the rear bearing can be released in sequence by operating the driving member, simplifying the original complicated disassembly and assembly operation, and fixing the outer ring surface of the rear bearing by using a tightening member instead of the original interference fit method, reducing the difficulty of separating the end cover and the rear bearing, and not easy to cause wear to the rear bearing.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and more particularly to a high-voltage and high-efficiency medium-sized three-phase asynchronous motor. Background Art

[0002] The three-phase asynchronous motor is a type of induction motor. It is mainly powered by 380V three-phase AC current. Since the rotor and stator rotating magnetic fields of the three-phase asynchronous motor rotate in the same direction and at different speeds, there is a slip rate, so it is called a three-phase asynchronous motor. Compared with, the three-phase asynchronous motor has good operating performance and can save various materials, and has been widely used. High-voltage and high-efficiency medium-sized three-phase asynchronous motor is a type of three-phase asynchronous motor. Because its required voltage is higher than 1000V, and compared with ordinary motors, it can more effectively convert electrical energy into mechanical energy during operation, so it is called a high-voltage and high-efficiency medium-sized three-phase asynchronous motor. It is mainly suitable for occasions that require high power output.

[0003] Since this type of motor is used in high-power output situations, it often needs to run at high load for a long time, and the bearing loss inside it is relatively large. In order to ensure the normal and efficient output of the motor, it is necessary to regularly maintain and overhaul its internal bearings and related components such as the rotor. However, the rear bearing of the existing high-voltage and high-efficiency medium-sized three-phase asynchronous motor is installed on the rear end cover, and a dust cover is also installed on the outside of the rear end cover. When maintaining or overhauling, it is necessary to first remove the dust cover, then remove the heat dissipation blades located in the dust cover, and then remove the rear end cover. The operation process is relatively cumbersome, and the rear end cover and the bearing are interference fit, which makes it difficult to separate the two. Improper operation can also easily cause wear of the rear bearing. Therefore, it is necessary to provide a high-voltage and high-efficiency medium-sized three-phase asynchronous motor that can easily overhaul the rear bearing. Summary of the invention

[0004] The object of the present invention is to provide a high-voltage and high-efficiency medium-sized three-phase asynchronous motor to solve the above-mentioned technical problems.

[0005] The present invention solves the above-mentioned technical problems through the following technical solutions:

[0006] The present invention provides a three-phase asynchronous motor, comprising: a housing, a rotor, an end cover and a dust cover, wherein a rear bearing is installed at one end of the rotor, the end cover and the dust cover are both installed at the same end of the housing, and the end cover is located on the inner side of the dust cover, the housing overlaps with the connecting end of the end cover and the dust cover, a gap is left between the outer ring surface of the rear bearing and the inner side wall of the end cover, an installation mechanism is arranged at one end of the housing close to the end cover, the installation mechanism comprises a driving member, a transmission member, a fixing member and a pressing member, the transmission member is rotatably installed at one end of the inner side of the housing close to the end cover, the driving member is connected to the transmission member, the transmission member is connected to the fixing member and the pressing member respectively, the fixing member is used to simultaneously fix the connecting end of the end cover and the housing and the connecting end of the dust cover and the housing, and the pressing member is used to press and fix the outer ring surface of the rear bearing;

[0007] When the rear bearing is under inspection and maintenance, the driving member drives the transmission member to rotate, so that the transmission member drives the fixing member to move and releases the fixing effect on the dust cover. The driving member continues to drive the transmission member to rotate, so that the fixing member releases the fixing effect on the end cover. Then, the transmission member continues to drive the transmission member to rotate, drives the clamping member to move, and releases the squeezing and fixing effect on the outer ring surface of the rear bearing, so as to realize the rapid disassembly of the rear bearing.

[0008] As a further optimization scheme of the present invention, the driving member includes a fastening bolt, a tooth plate and a tooth segment, the fastening bolt is threadedly installed on the outside of the shell, the tooth plate is slidingly connected to the outside of the shell, one end of the tooth plate is rotatably connected to the end of the fastening bolt, the tooth segment is fixed on the outside of the transmission member, and the tooth plate is meshed with the tooth segment.

[0009] As a further optimization scheme of the present invention, three arc-shaped protrusions are fixed on one side of the tooth plate, and the three arc-shaped protrusions are respectively used to reflect the preset displacement of the tooth plate. When the tooth plate is driven to slide by rotating the fastening bolt, when the first arc-shaped protrusion contacts the shell, the fixing member just releases the fixing effect on the dust cover, when the second arc-shaped protrusion contacts the shell, the fixing member just releases the fixing effect on the end cover, and when the third arc-shaped protrusion contacts the shell, the clamping member just releases the clamping and fixing effect on the rear bearing.

[0010] As a further optimization scheme of the present invention, the transmission part includes a truncated cone-shaped cylinder, the cylinder is made of heat-conductive material, the center of the cylinder coincides with the axis of the rotor, the two outer ring surfaces of the cylinder are evenly provided with heat-conductive plates, and the end of the cylinder is slidably connected to the inner wall of the shell.

[0011] As a further optimization scheme of the present invention, a step groove is provided on the side of the end cover close to the shell, and a ring-shaped plug plate is provided on the side of the shell close to the end cover, and the plug plate is inserted into the step groove. A number of connecting protrusions are fixedly installed on the inner side of the dust cover, and a number of connecting grooves corresponding to the connecting protrusions are provided on the outer ring surface of the end cover. A number of the connecting protrusions are slidably spliced ​​with the number of connecting grooves in a one-to-one correspondence, and the connecting protrusions and the step grooves are kept aligned up and down.

[0012] As a further optimization scheme of the present invention, the fixing member includes a plurality of first sliding shafts and a plurality of S-shaped first traction grooves, the plurality of first traction grooves are evenly distributed on one side of the cylinder table surface, the plurality of first sliding shafts are slidingly connected with the plurality of first traction grooves in a one-to-one correspondence, the ends of the plurality of first sliding shafts are fixedly installed with sliding clamping shafts, the side of the connecting protrusion close to the connecting groove, the inner side wall of the end cover and one side of the annular plug plate are all provided with circular holes, and the end of the sliding clamping shaft is slidably clamped with the three circular holes in sequence from the inner side of the end cover.

[0013] As a further optimization scheme of the present invention, the clamping member includes a plurality of second sliding shafts and a plurality of S-shaped second traction grooves, the plurality of second traction grooves are circumferentially evenly distributed on one side of the cylinder body close to the rear bearing table surface, the plurality of second sliding shafts are slidably connected with the plurality of second traction grooves in a one-to-one correspondence, the ends of the plurality of second sliding shafts are fixedly installed with clamping shafts, the ends of the clamping shafts are fitted with the outer ring surface of the rear bearing, the first traction groove and the second traction groove both include a traction section and a transition section, the center of the transition section coincides with the center of the cylinder body, when the first sliding shaft or the second sliding shaft slides to the transition section, it will not be subjected to any force, and when the first sliding shaft or the second sliding shaft slides to the traction section, it will move due to the force.

[0014] As a further optimization scheme of the present invention, the high-voltage and high-efficiency medium-sized three-phase asynchronous motor also includes a lubrication mechanism, which includes a negative pressure movable part, a liquid storage chamber, a negative pressure chamber, a first infusion channel, a second infusion channel and a connecting channel. The negative pressure chamber and the liquid storage chamber are both arranged in a connecting protrusion located at the top of the shell. Lubricant is stored in the liquid storage chamber. A liquid inlet hole connected to the liquid storage chamber is provided at the top of the dust cover. An elastic plugging member is provided in the liquid inlet hole. The upper end of the negative pressure chamber is connected to the lower end of the liquid storage chamber through a connecting channel. The first infusion channel is arranged in the connecting protrusion, one end of the first infusion channel is connected to the upper end of the negative pressure chamber, and the other end thereof extends to the bottom of the connecting protrusion. The second infusion channel is arranged in the end cover, one end of the second infusion channel extends to the outside of the end cover and is aligned with the bottom end of the first infusion channel, and the other end thereof extends to one side of the rear bearing. A one-way valve is provided in the connecting channel and the first infusion channel. The negative pressure movable part is slidably arranged in the negative pressure chamber, and one end thereof is fitted with the corresponding sliding card shaft.

[0015] When the sliding card shaft and the connecting protrusion are gradually separated, the negative pressure movable part starts to slide in the negative pressure chamber, causing the air pressure inside the negative pressure chamber to change. The elastic sealing part is activated by pressure to open the liquid inlet hole, and the lubricant enters the negative pressure chamber from the liquid storage chamber through the connecting channel. When the sliding card shaft generates a thrust on the negative pressure movable part, the negative pressure movable part squeezes the lubricant into the first infusion channel, so that the lubricant flows to the rear bearing position through the second infusion channel.

[0016] As a further optimization solution of the present invention, the negative pressure movable member includes a piston rod, and a return spring is fixedly installed between the piston rod and the negative pressure chamber.

[0017] As a further optimization solution of the present invention, the elastic sealing member includes a sealing sheet, which is arranged on the bottom surface of the liquid inlet hole of the liquid storage cavity, and a connecting spring is fixedly installed between the top surface of the sealing sheet and the bottom surface of the liquid inlet hole.

[0018] The beneficial effects of the present invention are:

[0019] The present invention can fix the dust cover, the end cover and the rear bearing at the same time by arranging the installation mechanism. When the rear bearing is located for inspection and maintenance, the dust cover, the end cover and the rear bearing can be released in sequence by operating the driving member only, thereby simplifying the original complicated disassembly and assembly operations. The outer ring surface of the rear bearing is fixed by the tightening member, which replaces the original interference fit method, reduces the difficulty of separating the end cover and the rear bearing, is not easy to cause wear to the rear bearing, and is convenient for inspection and maintenance operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a high-voltage and high-efficiency medium-sized three-phase asynchronous motor provided by the present invention;

[0021] Figure 2 It is an exploded diagram of a high-voltage and high-efficiency medium-sized three-phase asynchronous motor provided by the present invention;

[0022] Figure 3 It is a cross-sectional view from the first perspective of a high-voltage, high-efficiency, medium-sized three-phase asynchronous motor provided by the present invention;

[0023] Figure 4 It is a cross-sectional view of a high-voltage and high-efficiency medium-sized three-phase asynchronous motor provided by the present invention from a second viewing angle;

[0024] Figure 5 It is a structural schematic diagram of an installation mechanism in a high-voltage and high-efficiency medium-sized three-phase asynchronous motor provided by the present invention;

[0025] Figure 6 It is a schematic diagram of the structure between the housing and the end cover of a high-voltage and high-efficiency medium-sized three-phase asynchronous motor provided by the present invention;

[0026] Figure 7 It is a local position cutaway diagram of a high-voltage and high-efficiency medium-sized three-phase asynchronous motor provided by the present invention;

[0027] Figure 8 The present invention Figure 7 A local enlarged schematic diagram of the middle A;

[0028] Fig. 9 The present invention provides a schematic diagram of the structure between a transmission part, a fixing part and a fastening part in a high-voltage and high-efficiency medium-sized three-phase asynchronous motor.

[0029] In the figure: 1, housing; 2, rotor; 3, end cover; 4, dust cover; 5, rear bearing; 6, mounting mechanism; 61, driving member; 611, fastening bolt; 612, tooth plate; 613, tooth segment; 614, arc-shaped protrusion; 62, transmission member; 621, cylinder; 622, heat conducting sheet; 63, fixing member; 631, first sliding shaft; 632, first traction groove; 633, sliding clamping shaft; 634, round hole; 64, fastening member; 641, first Second sliding shaft; 642, second traction groove; 643, clamping shaft; 7, lubrication mechanism; 71, liquid storage chamber; 72, negative pressure chamber; 73, first infusion channel; 74, second infusion channel; 75, connecting channel; 76, liquid inlet hole; 77, one-way valve; 78, piston rod; 79, reset spring; 710, blocking piece; 711, connecting spring; 8, step groove; 9, annular plug plate; 10, connecting protrusion; 11, connecting groove; 12, heat dissipation blade. DETAILED DESCRIPTION

[0030] The subject matter described herein will now be discussed with reference to example embodiments. It should be understood that the discussion of these embodiments is only to enable those skilled in the art to better understand and implement the subject matter described herein, and the functions and arrangements of the elements discussed may be changed without departing from the scope of protection of the contents of this specification. Each example may omit, replace or add various processes or components as needed. In addition, the features described relative to some examples may also be combined in other examples.

[0031] Please refer to Figures 1 to 4A high-voltage and high-efficiency medium-sized three-phase asynchronous motor comprises: a housing 1, a rotor 2, an end cover 3 and a dust cover 4. A rear bearing 5 is installed at one end of the rotor 2. The end cover 3 and the dust cover 4 are installed at the same end of the housing 1, and the end cover 3 is located on the inner side of the dust cover 4. The housing 1 overlaps with the connecting end of the end cover 3 and the dust cover 4. A gap is left between the outer ring surface of the rear bearing 5 and the inner side wall of the end cover 3. A mounting mechanism 6 is arranged at one end of the housing 1 close to the end cover 3. The mounting mechanism 6 comprises a driving member 61, a transmission member 62, The fixing member 63 and the tightening member 64, the driving member 61 itself has an automatic function and can maintain a locked state without external force. The transmission member 62 is rotatably installed on the inner side of the shell 1 near one end of the end cover 3. The driving member 61 is connected to the transmission member 62, and the transmission member 62 is connected to the fixing member 63 and the tightening member 64 respectively. The fixing member 63 is used to fix the connecting end of the end cover 3 and the shell 1 and the connecting end of the dust cover 4 and the shell 1 at the same time, and the tightening member 64 is used to squeeze and fix the outer ring surface of the rear bearing 5.

[0032] It should be noted that when inspecting and maintaining the position of the rear bearing 5, the driving member 61 is first used to drive the transmission member 62 to rotate, so that the transmission member 62 drives the fixing member 63 to move and release the fixing effect on the dust cover 4. The driving member 61 continues to drive the transmission member 62 to rotate, so that the fixing member 63 releases the fixing effect on the end cover 3. Then the transmission member 62 is continued to be driven to rotate, driving the clamping member 64 to move, and releasing the squeezing and fixing effect on the outer ring surface of the rear bearing 5. In this way, only by operating the driving member 61, the fixing effect on the dust cover 4, the end cover 3 and the rear bearing 5 can be released in turn, simplifying the original complicated disassembly and assembly operations. At the same time, the outer ring surface of the rear bearing 5 is fixed by the clamping member 64, replacing the original interference fit method, reducing the difficulty of separating the end cover 3 and the rear bearing 5, and facilitating the inspection and maintenance of the rear bearing 5 and related components such as the rotor 2.

[0033] Please refer to Figures 4 to 5 The driving member 61 includes a fastening bolt 611, a tooth plate 612 and a tooth segment 613. The fastening bolt 611 is threadedly installed on the outer side of the shell 1. The tooth plate 612 is slidably connected to the outer side of the shell 1. One end of the tooth plate 612 is rotatably connected to the end of the fastening bolt 611. The tooth segment 613 is fixed to the outer side of the transmission member 62, and the tooth plate 612 is meshed with the tooth segment 613.

[0034] It should be noted that when the rear bearing 5 does not need to be inspected and maintained, the fastening bolt 611 is fixed to the outer thread of the shell 1 to keep itself in a fixed state, thereby ensuring the stability of the entire installation mechanism 6. When the rear bearing 5 needs to be inspected and maintained, the dust cover 4 and the end cover 3 need to be removed to expose the rear bearing 5 to the outside. At this time, an auxiliary tool is used to dock with the head of the fastening bolt 611, and then the fastening bolt 611 is rotated forward to gradually translate it away from the outside of the shell 1, and drive the tooth plate 612 to slide, so that the tooth plate 612 drives the tooth segment 613 and the transmission member 62 to rotate together, and then the transmission member 62 can rotate on its own inside the shell 1, which can respectively drive the fixing member 63 and the clamping member 64 to move, and finally release the fixing effect on the dust cover 4, the end cover 3 and the rear bearing 5, and then the dust cover 4 and the end cover 3 can be easily removed.

[0035] Please refer to Figure 5 Three arc-shaped protrusions 614 are fixed on one side of the tooth plate 612. The three arc-shaped protrusions 614 are respectively used to reflect the preset displacement of the tooth plate 612. When the tooth plate 612 is driven to slide by rotating the fastening bolt 611, when the first arc-shaped protrusion 614 contacts the shell 1, the fixing member 63 just releases the fixing effect on the dust cover 4. When the second arc-shaped protrusion 614 contacts the shell 1, the fixing member 63 just releases the fixing effect on the end cover 3. When the third arc-shaped protrusion 614 contacts the shell 1, the tightening member 64 just releases the tightening and fixing effect on the rear bearing 5.

[0036] It should be noted that, in order to facilitate the staff to understand the current fixed status of the dust cover 4, the end cover 3 and the rear bearing 5, an arc-shaped protrusion 614 is set as a mechanism to reflect the status of the three. During the sliding process of the tooth plate 612, the arc-shaped protrusion 614 slides with the tooth plate 612. When the arc-shaped protrusion 614 slides and contacts the shell 1, a more obvious friction and sound will be generated. Due to its arc-shaped contact surface, it will not be greatly obstructed. The staff determines the fixed status of the dust cover 4, the end cover 3 and the bearing by sensing the friction and sound. Since the unlocking sequence is set in sequence according to the dust cover 4, the end cover 3 and the rear bearing 5, at this time, the staff only needs to sense in sequence to determine. This design is also to adapt to the situation where only the dust cover 4 is disassembled and the heat dissipation blades 12 inside it are inspected. In this case, the staff only needs to stop rotating the fastening bolts 611 when sensing that the first arc-shaped protrusion 614 contacts the shell 1, and then separate the dust cover 4 from the shell 1.

[0037] Please refer to Figure 5The transmission member 62 includes a truncated cone-shaped cylinder 621, which is made of heat-conducting material. The center of the cylinder 621 coincides with the axis of the rotor 2. The two outer ring surfaces of the cylinder 621 are evenly provided with heat-conducting plates 622. The end of the cylinder 621 is slidably connected to the inner wall of the shell 1.

[0038] It should be noted that the truncated cone-shaped cylinder 621 can be well adapted to the internal shape of the shell 1, and its two large and small table surfaces are used as connection points with the fixing member 63 and the clamping member 64. The setting of the heat conductive sheet 622 enables the transmission member 62 to have better heat conduction and heat dissipation. During the operation of the motor, it is used as a heat dissipation transmission structure. The heat conductive sheets 622 evenly distributed around the circumference can conduct heat at different positions of the shell 1, and the heat is conducted to the shell 1 through the end of the cylinder 621, and finally conducted to the outside by the heat dissipation fins on the outside of the shell 1. In this way, the transmission member 62 provided in the present invention can be used to dissipate heat inside the shell 1 when the motor is operating normally. When repairing the rear bearing 5 and the devices near it, it is used as a transmission structure to drive the fixing member 63 and the clamping member 64 to move.

[0039] Please refer to Figure 6 In order to adapt to the fixing method of the fixing member 63, the present invention adapts the connection method of the dust cover 4, the end cover 3 and the shell 1, specifically: a step groove 8 is provided on the side of the end cover 3 close to the shell 1, and a ring-shaped plug plate 9 is provided on the side of the shell 1 close to the end cover 3, and the plug plate is plugged into the step groove 8. Three connecting protrusions 10 are fixedly installed on the inner side of the dust cover 4, and three connecting grooves 11 corresponding to the connecting protrusions 10 are provided on the outer ring surface of the end cover 3. The three connecting protrusions 10 are slidably spliced ​​with the three connecting grooves 11 in a one-to-one correspondence, and the connecting protrusions 10 and the step grooves 8 are kept aligned up and down.

[0040] It should be noted that after the motor is overhauled, when the end cover 3 and the dust cover 4 are installed, the end cover 3 is first connected to the rear end of the shell 1, and the end cover 3 is temporarily connected to the shell 1 by aligning and plugging the step groove 8 with the annular plug plate 9. Then, by aligning the connecting protrusion 10 with the connecting groove 11, the two are translated and slidably docked, so that the dust cover 4 is temporarily connected to the shell 1. Finally, by rotating the driving member 61, the fixing member 63 successively fixes the dust cover 4 and the end cover 3, so that the two remain fixedly connected to the shell 1.

[0041] Please refer to Figures 7 to 9The fixing member 63 includes three first sliding shafts 631 and three S-shaped first traction grooves 632. The three first traction grooves 632 are evenly distributed on one side of the table surface of the cylinder 621. The three first sliding shafts 631 are slidably connected with the three first traction grooves 632 in a one-to-one correspondence. The ends of the three first sliding shafts 631 are fixedly installed with sliding clamping shafts 633. Circular holes 634 are provided on one side of the connecting protrusion 10 close to the connecting groove 11, the inner side wall of the end cover 3 and one side of the annular plug plate 9. The ends of the sliding clamping shaft 633 are slidably clamped with the three circular holes 634 in sequence from the inner side of the end cover 3.

[0042] It should be noted that when the transmission member 62 rotates, the first traction groove 632 rotates along with the transmission member 62, thereby generating a pulling force on the first sliding shaft 631, so that the first sliding shaft 631 drives the sliding card shaft 633 to slide and shrink toward the inside of the shell 1, so that the end of the sliding card shaft 633 gradually separates from the circular hole 634. When the end of the sliding card shaft 633 separates from the circular hole 634 on the connecting protrusion 10, the fixing effect on the dust cover 4 is released. When the sliding card shaft 633 separates from the circular hole 634 on the end cover 3, the fixing effect on the end cover 3 is released.

[0043] Please refer to Figure 5 , Figure 7 and Figure 8 The clamping member 64 includes five second sliding shafts 641 and five S-shaped second traction grooves 642. The five second traction grooves 642 are evenly distributed on the side of the cylinder 621 close to the table surface of the rear bearing 5. The five second sliding shafts 641 are slidably connected with the five second traction grooves 642 in a one-to-one correspondence. The ends of the five second sliding shafts 641 are fixedly installed with clamping shafts 643. The ends of the clamping shafts 643 are in contact with the outer ring surface of the rear bearing 5. The first traction groove 632 and the second traction groove 642 both include a traction section and a transition section. The center of the transition section coincides with the center of the cylinder 621. When the first sliding shaft 631 or the second sliding shaft 641 slides to the transition section, it will not be subjected to any force. When the first sliding shaft 631 or the second sliding shaft 641 slides to the traction section, it will move due to the force.

[0044] It should be noted that, in the process that the transmission member 62 drives the fixing member 63 to release the fixing effect on the dust cover 4 and the end cover 3 in turn, the first sliding shaft 631 is first slid along its corresponding traction section, so that the first sliding shaft 631 is subjected to the force and moves, and at the same time, the second sliding shaft 641 slides in its corresponding transition section, and will not be subjected to the force and will not move, so that the clamping shaft 643 still maintains the fixing effect on the rear bearing 5, and after the sliding clamping shaft 633 contacts the fixing effect on the end cover 3 and the dust cover 4, it continues to rotate through the transmission member 62, and at this time, the first sliding shaft 631 slides to the corresponding transition section, so that the first sliding shaft 631 is no longer subjected to the force. The second sliding shaft 641 moves, and the second sliding shaft 641 slides to the corresponding traction section, and is acted upon by the traction section to drive the clamping shaft 643 to gradually move away from the outer ring surface of the rear bearing 5. When the second sliding shaft 641 slides to the end of the transition section, the clamping shaft 643 is completely separated from the outer ring surface of the rear bearing 5, and the transmission member 62 cannot continue to rotate due to the obstruction of the second sliding shaft 641. At this time, the fixation of the rear bearing 5 is released, and thereafter the dust cover 4, the heat dissipation blades 12, and the end cover 3 can be removed in sequence to expose the rear bearing 5, the end of the rotor 2 and the devices nearby, and the staff can directly carry out relevant inspection and maintenance operations.

[0045] Please refer to Figures 8 to 9Since the rear bearing 5 is installed near the inner side of the housing 1, when only lubrication is required, if the above-mentioned disassembly and assembly operation is performed, the actual operation process is cumbersome and inconvenient. Therefore, in order to facilitate the addition of lubricant to the rear bearing 5, the present invention is optimized on the basis of the above-mentioned scheme, specifically: the high-voltage and high-efficiency medium-sized three-phase asynchronous motor also includes a lubrication mechanism 7, the lubrication mechanism 7 includes a negative pressure movable part, a liquid storage chamber 71, a negative pressure chamber 72, a first infusion channel 73, a second infusion channel 74 and a connecting channel 75, the negative pressure chamber 72 and the liquid storage chamber 71 are both arranged in the connecting protrusion 10 located at the top of the housing 1, the liquid storage chamber 71 stores lubricant, the top of the dust cover 4 is provided with a liquid inlet hole 76 connected to the liquid storage chamber 71, and an elastic sealing member is provided in the liquid inlet hole 76 The upper end of the negative pressure chamber 72 is connected to the lower end of the liquid storage chamber 71 through a connecting channel 75. The first infusion channel 73 is arranged in the connecting protrusion 10. One end of the first infusion channel 73 is connected to the upper end of the negative pressure chamber 72, and the other end thereof extends to the bottom of the connecting protrusion 10. The second infusion channel 74 is arranged in the end cover 3. One end of the second infusion channel 74 extends to the outside of the end cover 3 and is aligned with the bottom end of the first infusion channel 73, and the other end thereof extends to one side of the rear bearing 5. A one-way valve 77 is provided in both the connecting channel 75 and the first infusion channel 73. The negative pressure movable part is slidably arranged in the negative pressure chamber 72, and one end thereof is fitted with the corresponding sliding card shaft 633; ​​the negative pressure movable part includes a piston rod 78, and a return spring 79 is fixedly installed between the piston rod 78 and the negative pressure chamber 72. The elastic blocking member includes a blocking piece 710 , which is disposed on the bottom surface of the liquid inlet hole 76 of the liquid storage cavity 71 , and a connecting spring 711 is fixedly installed between the top surface of the blocking piece 710 and the bottom surface of the liquid inlet hole 76 .

[0046] It should be noted that when only lubricant needs to be added to the rear bearing 5, the driving member 61 is rotated to make the sliding card shaft 633 gradually move away from the circular hole 634 on the dust cover 4, and the movable rod slides synchronously with the sliding card shaft 633 under the elastic force of the return spring 79, and the piston rod 78 slides downward in the negative pressure chamber 72 to increase the air pressure inside the negative pressure chamber 72, which can produce a suction effect on the liquid storage chamber 71, and the lubricant in the liquid storage chamber 71 can be drawn into the connecting channel 75, and flows into the negative pressure chamber 72 through the one-way valve 77, and the blocking piece 710 is subjected to the pressure and starts to move downward, and the connecting spring 711 is stretched synchronously to open the liquid inlet hole 76. The staff determines that the sliding card shaft 633 is separated from the circular hole 634 on the dust cover 4 according to the arc-shaped protrusion 614, and then stops the positive rotation of the driving member 6 1. At this time, the piston rod 78 slides to the lower end of the negative pressure chamber 72, and the negative pressure chamber 72 is filled with lubricant. Then, by rotating the driving member 61 in the opposite direction, the sliding card shaft 633 can be driven to slide upward to extend to the circular hole 634 in the dust cover 4, and the piston rod 78 is pushed by the sliding card shaft 633, and slides upward in the negative pressure chamber 72 synchronously, and generates a squeezing force on the lubricant inside it. Due to the action of the one-way valve 77 in the connecting channel 75, the lubricant cannot flow back to the connecting channel 75, but directly flows into the first infusion channel 73, and then the lubricant flows to the position of the rear bearing 5 through the second infusion channel 74. When the driving member 61 cannot continue to rotate, the sliding card shaft 633 is completely engaged with the circular hole 634 on the dust cover 4, and the piston rod 78 is also reset, thus completing the lubricant adding operation. The present invention uses the lubricating mechanism 7 and the mounting mechanism 6 in coordination with each other. Under the premise of not disassembling the end cover 3 and the dust cover, the lubricant can be added to the rear bearing 5 only by operating the driving member 61, making the addition of lubricant more convenient and greatly reducing the difficulty of operation. It can be seen that the mounting mechanism 6 provided in the present invention is used as a fixed structure to fix the end cover 3, the dust cover 4 and the rear bearing 5 when used alone, and is used as a driving structure for the lubricant to squeeze the lubricant into the rear bearing 5 when used in coordination with the lubricating mechanism 7.

[0047] An example of the present specific implementation mode is described above, but the present embodiment is not limited to the above-mentioned specific implementation mode, which is merely illustrative and not restrictive. A person skilled in the art may make many forms inspired by the present embodiment, all of which are protected by the present embodiment.

Claims

1. A high-voltage and high-efficiency medium-sized three-phase asynchronous motor, comprising: A housing, a rotor, an end cover and a dust cover, wherein a rear bearing is mounted on one end of the rotor, the end cover and the dust cover are both mounted on the same end of the housing, and the end cover is located on the inner side of the dust cover, and is characterized in that the housing coincides with the connecting ends of the end cover and the dust cover, a gap is left between the outer ring surface of the rear bearing and the inner side wall of the end cover, an installation mechanism is provided on the end of the housing close to the end cover, the installation mechanism comprises a driving member, a transmission member, a fixing member and a clamping member, the transmission member is rotatably mounted on the inner side of the housing close to the end cover, the driving member is connected to the transmission member, the transmission member is respectively connected to the fixing member and the clamping member, the fixing member is used to simultaneously fix the connecting end of the end cover and the housing and the connecting end of the dust cover and the housing, and the clamping member is used to squeeze and fix the outer ring surface of the rear bearing; When the rear bearing is inspected and maintained, the driving member drives the transmission member to rotate, so that the transmission member drives the fixing member to move and releases the fixing effect on the dust cover. The driving member continues to drive the transmission member to rotate, so that the fixing member releases the fixing effect on the end cover. Then, the transmission member continues to drive the transmission member to rotate, drives the abutting member to move, and releases the squeezing and fixing effect on the outer ring surface of the rear bearing, so as to realize the rapid disassembly of the rear bearing. The driving member includes a fastening bolt, a tooth plate and a tooth segment, wherein the fastening bolt is threadedly mounted on the outer side of the housing, the tooth plate is slidably connected to the outer side of the housing, one end of the tooth plate is rotatably connected to the end of the fastening bolt, the tooth segment is fixed to the outer side of the transmission member, and the tooth plate is meshed with the tooth segment; Three arc-shaped protrusions are fixed on one side of the tooth plate, and the three arc-shaped protrusions are respectively used to reflect the preset displacement of the tooth plate. When the tooth plate is driven to slide by rotating the fastening bolt, when the first arc-shaped protrusion contacts the shell, the fixing member just releases the fixing effect on the dust cover, when the second arc-shaped protrusion contacts the shell, the fixing member just releases the fixing effect on the end cover, and when the third arc-shaped protrusion contacts the shell, the clamping member just releases the clamping and fixing effect on the rear bearing.

2. A high-voltage and high-efficiency medium-sized three-phase asynchronous motor according to claim 1, characterized in that: The transmission member comprises a truncated cone-shaped cylinder, the cylinder is made of heat-conducting material, the center of the cylinder coincides with the axis of the rotor, two outer annular surfaces of the cylinder are evenly provided with heat-conducting plates, and the end of the cylinder is slidably connected to the inner wall of the shell.

3. A high-voltage and high-efficiency medium-sized three-phase asynchronous motor according to claim 2, characterized in that: A step groove is provided on one side of the end cover close to the shell, and an annular plug plate is provided on one side of the shell close to the end cover, and the plug plate is inserted into the step groove. A plurality of connecting protrusions are fixedly installed on the inner side of the dust cover, and a plurality of connecting grooves corresponding to the connecting protrusions are provided on the outer ring surface of the end cover. The connecting protrusions are slidably spliced ​​with the connecting grooves in a one-to-one correspondence, and the connecting protrusions are aligned up and down with the step grooves.

4. A high-voltage and high-efficiency medium-sized three-phase asynchronous motor according to claim 3, characterized in that: The fixing member includes a plurality of first sliding shafts and a plurality of S-shaped first traction grooves, the circumference of the plurality of first traction grooves being uniformly distributed on one side of the cylinder table surface, the plurality of first sliding shafts being slidably connected with the plurality of first traction grooves in a one-to-one correspondence, the ends of the plurality of first sliding shafts being fixedly mounted with sliding clamping shafts, the side of the connecting protrusion close to the connecting groove, the inner side wall of the end cover and one side of the annular plug plate being provided with circular holes, the ends of the sliding clamping shaft being slidably clamped with the three circular holes in sequence from the inner side of the end cover.

5. A high-voltage and high-efficiency medium-sized three-phase asynchronous motor according to claim 4, characterized in that: The clamping member includes a plurality of second sliding shafts and a plurality of S-shaped second traction grooves, wherein the plurality of second traction grooves are evenly distributed on one side of the cylinder body close to the rear bearing table surface, and the plurality of second sliding shafts are slidably connected with the plurality of second traction grooves in a one-to-one correspondence, and the ends of the plurality of second sliding shafts are fixedly mounted with clamping shafts, and the ends of the clamping shafts are fitted with the outer ring surface of the rear bearing, and the first traction groove and the second traction groove both include a traction section and a transition section, and the center of the transition section coincides with the center of the cylinder body, and when the first sliding shaft or the second sliding shaft slides to the transition section, it will not be subjected to any force, and when the first sliding shaft or the second sliding shaft slides to the traction section, it will move due to the force.

6. A high-voltage and high-efficiency medium-sized three-phase asynchronous motor according to claim 5, characterized in that: The high-voltage and high-efficiency medium-sized three-phase asynchronous motor also includes a lubrication mechanism, which includes a negative pressure movable part, a liquid storage chamber, a negative pressure chamber, a first infusion channel, a second infusion channel and a connecting channel. The negative pressure chamber and the liquid storage chamber are both arranged in a connecting protrusion located at the top of the shell. Lubricant is stored in the liquid storage chamber. A liquid inlet hole communicating with the liquid storage chamber is arranged on the top of the dust cover. An elastic plugging part is arranged in the liquid inlet hole. The upper end of the negative pressure chamber is communicated with the lower end of the liquid storage chamber through a connecting channel. The first infusion channel is arranged in the connecting protrusion. One end of the first infusion channel is communicated with the upper end of the negative pressure chamber, and the other end thereof extends to the bottom of the connecting protrusion. The second infusion channel is arranged in the end cover. One end of the second infusion channel extends to the outside of the end cover and is aligned with the bottom end of the first infusion channel, and the other end thereof extends to one side of the rear bearing. A one-way valve is arranged in the connecting channel and the first infusion channel. The negative pressure movable part is slidably arranged in the negative pressure chamber, and one end thereof is fitted with the corresponding sliding card shaft. When the sliding card shaft and the connecting protrusion are gradually separated, the negative pressure movable part starts to slide in the negative pressure chamber, causing the air pressure inside the negative pressure chamber to change. The elastic sealing part is activated by pressure to open the liquid inlet hole, and the lubricant enters the negative pressure chamber from the liquid storage chamber through the connecting channel. When the sliding card shaft generates a thrust on the negative pressure movable part, the negative pressure movable part squeezes the lubricant into the first infusion channel, so that the lubricant flows to the rear bearing position through the second infusion channel.

7. A high-voltage and high-efficiency medium-sized three-phase asynchronous motor according to claim 6, characterized in that: The negative pressure movable part comprises a piston rod, and a return spring is fixedly installed between the piston rod and the negative pressure chamber.

8. A high-voltage and high-efficiency medium-sized three-phase asynchronous motor according to claim 7, characterized in that: The elastic sealing member comprises a sealing sheet, which is arranged on the bottom surface of the liquid inlet hole of the liquid storage cavity, and a connecting spring is fixedly installed between the top surface of the sealing sheet and the bottom surface of the liquid inlet hole.

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