Self-cleaning sealing transmission device for motor main shaft

Abstract

The invention relates to a self-cleaning sealing transmission device for a motor spindle, and relates to the technical field of spindle transmission, the self-cleaning sealing transmission device comprises a shaft sleeve, one end of the shaft sleeve is provided with a sealing ring seat, the shaft sleeve is sleeved with a cover plate, the cover plate is connected with the sealing ring seat, one side, facing the shaft sleeve, of the cover plate is provided with an outer ring groove, and one side, facing the cover plate, of the shaft sleeve is provided with an inner ring groove. The outer ring groove and the inner ring groove are oppositely arranged, a settling cavity is formed between the outer ring groove and the inner ring groove, an isolating ring seat and a buffering assembly are arranged between the cover plate and the shaft sleeve, the settling cavity is located between the buffering assembly and the isolating ring seat, and the buffering assembly is used for reducing the flow speed of fluid entering the settling cavity. And the isolating ring seat is positioned between the settling cavity and the sealing ring seat. The sealing transmission device has the effects that the maintenance frequency of the sealing transmission device is reduced, and the normal operation time of the main shaft and the shell is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of spindle transmission, in particular to a self-cleaning sealing transmission device for a motor spindle. Background Art

[0002] At present, the cooperation between the stator winding and the permanent magnet is an important way to convert electrical energy into mechanical energy output. There are two ways for the stator winding and the permanent magnet to cooperate with each other. One is the outer rotor installation method, in which the permanent magnet is outside the stator winding, the stator winding is installed on the main shaft and the main shaft is fixed, the permanent magnet is installed on the shell and the shell rotates; the other is the inner rotor installation method, in which the permanent magnet is inside the stator winding, the stator winding is installed on the shell and the shell is fixed, the permanent magnet is installed on the main shaft and the main shaft rotates.

[0003] Since the stator winding and the permanent magnet are both located in the space formed between the main shaft and the housing, in order to protect the stator winding and the permanent magnet and reduce damage to the stator winding and the permanent magnet, a sealed transmission structure is usually installed between the main shaft and the housing. On the one hand, the sealed transmission structure enables the main shaft and the housing to rotate normally relative to each other. On the other hand, the sealed transmission structure seals the gap between the main shaft and the housing to prevent external dust from entering the space formed between the main shaft and the housing.

[0004] In the prior art, a multi-layer lip seal is often used in the sealing transmission structure between the main shaft and the housing. However, this sealing method is prone to damage in a high dust environment. After impurities and dust enter the multi-layer lip seal, they are easily adhered and accumulated inside the multi-layer lip seal, causing the multi-layer lip seal to quickly wear and fail. When the multi-layer lip seal wears and fails, it is necessary to stop the relative rotation of the main shaft and the housing, and perform maintenance and replacement on the sealing transmission structure, making it difficult for the main shaft and the housing to operate normally for a long time. Summary of the invention

[0005] In order to reduce the maintenance frequency of the sealed transmission device and extend the normal operation time of the main shaft and the housing, the present application provides a self-cleaning sealed transmission device for a motor main shaft.

[0006] The present application provides a self-cleaning sealing transmission device for a motor spindle, which adopts the following technical solution: A self-cleaning sealing transmission device for a motor spindle comprises a shaft sleeve, a sealing ring seat is arranged at one end of the shaft sleeve, a cover plate is sleeved on the shaft sleeve, the cover plate is connected to the sealing ring seat, an outer ring groove is formed on the cover plate facing the shaft sleeve side, an inner ring groove is formed on the shaft sleeve facing the cover plate side, the outer ring groove and the inner ring groove are arranged opposite to each other, a sedimentation chamber is formed between the outer ring groove and the inner ring groove, an isolation ring seat and a buffer assembly are arranged between the cover plate and the shaft sleeve, the sedimentation chamber is located between the buffer assembly and the isolation ring seat, the buffer assembly is used to reduce the flow rate of the fluid entering the sedimentation chamber, and the isolation ring seat is located between the sedimentation chamber and the sealing ring seat.

[0007] By adopting the above technical solution, the cover plate is installed on the shell through the flange, and sealant is filled between the cover plate and the shell, and sealant is filled between the cover plate and the sealing ring seat. The sleeve is made of stainless steel, and the sleeve and the sealing ring seat are both sleeved on the main shaft. The sleeve is interference-connected with the main shaft, and a seal is formed between the sealing ring seat and the outer wall of the main shaft, thereby satisfying the sealing effect between the shell and the main shaft. When the main shaft and the shell rotate relative to each other, the cover plate drives the sealing ring seat to rotate relative to the sleeve synchronously, thereby satisfying the effect of normal relative rotation between the main shaft and the shell. When the main shaft and the shell are running in a high-dust environment, the dust-containing fluid is first blocked by the buffer component to reduce the movement speed of the fluid entering the sedimentation chamber, so that the dust-containing fluid Dust and other impurities in the fluid settle in the sedimentation chamber, so that most of the dust and other impurities in the dust-containing fluid are bonded and accumulated in the sedimentation chamber. Through the cooperation of the sedimentation chamber and the buffer assembly, the content of dust and other impurities in the fluid moving toward the isolation ring seat is greatly reduced. Afterwards, the isolation ring seat isolates the impurities in the dust-containing fluid from the sealing ring seat, making it difficult for the impurities in the dust-containing fluid to move toward the sealing ring seat, reducing the wear of the sealing ring seat by dust and other impurities, so that the sealing ring seat can reliably seal the main shaft for a long time, reduce the phenomenon of rapid wear and failure of the sealing ring seat, extend the service life of the sealing ring seat, reduce the maintenance frequency of the sealing transmission device, and extend the normal operation time of the main shaft and the housing.

[0008] Preferably, the buffer assembly comprises a group of limiting rings and labyrinth rings, the limiting rings and labyrinth rings are both sleeved on the shaft sleeve, the limiting rings are fixedly connected to the shaft sleeve, the inner ring wall of the limiting rings and the outer ring wall of the shaft sleeve fit together, the labyrinth rings are connected to the cover plate, the outer ring wall of the labyrinth rings and the inner ring wall of the cover plate fit together, the labyrinth rings are made of tetrafluoroethylene, the labyrinth rings are located between the limiting rings, there is a movable gap between the limiting rings and the shaft sleeve and the labyrinth rings, and the labyrinth rings are provided with a plurality of labyrinth grooves facing the side of the shaft sleeve.

[0009] By adopting the above technical scheme, the labyrinth sleeve is interference installed in the cover plate, and the labyrinth sleeve, the limit ring sleeve, the shaft sleeve and the labyrinth groove form a labyrinth channel. On the one hand, the labyrinth channel slows down the movement speed of the fluid, and on the other hand, the labyrinth channel forms a labyrinth seal. Since there is an active gap on the outside of the labyrinth sleeve, when the shell and the main shaft rotate relative to each other, the limit ring sleeve and the shaft sleeve both rotate relative to the labyrinth sleeve. Since the labyrinth sleeve is made of tetrafluoroethylene material, the corrosion resistance and wear resistance of the labyrinth sleeve are improved, so that the labyrinth sleeve can be used reliably for a long time, the rapid wear and failure of the labyrinth sleeve can be reduced, the service life of the labyrinth sleeve can be extended, the maintenance frequency of the labyrinth sleeve can be reduced, and the normal operation time of the main shaft and the shell can be extended.

[0010] Preferably, the isolation ring seat is made of copper alloy, and the cover plate is provided with an isolation ring groove on one side of the isolation ring seat, and the isolation ring seat is arranged in the isolation ring groove. The outer ring wall and the end wall of the isolation ring seat are both in contact with the inner wall of the isolation ring groove, and a plurality of graphite circular holes are provided on the inner ring wall of the isolation ring seat, and a graphite layer is arranged in the graphite circular holes, and the area of ​​the entire graphite layer accounts for 20% of the area of ​​the inner ring wall of the isolation ring seat, and the graphite layer abuts against the outer ring wall of the sleeve.

[0011] By adopting the above technical scheme, the isolation ring seat is interference installed in the isolation ring groove. When the housing and the main shaft rotate relative to each other, the isolation ring seat and the main shaft sleeve rotate relative to each other. The isolation ring seat is made of wear-resistant copper alloy. There is a graphite layer between the isolation ring seat and the sleeve. The graphite layer is made of flexible graphite. Therefore, the isolation ring seat has high strength, corrosion resistance and good lubrication properties, which enables the isolation ring seat to be used reliably for a long time, reduces the rapid wear and failure of the isolation ring seat, extends the service life of the isolation ring seat, reduces the maintenance frequency of the isolation ring seat, and extends the normal operation time of the main shaft and the housing.

[0012] Preferably, the sleeve has a threaded groove on one side facing the isolation ring seat, a spiral channel is formed between the inner wall of the threaded groove and the inner ring wall of the isolation ring seat, the spiral channel and the inner ring groove are interconnected, and the threaded groove is used to send impurities in the spiral channel into the sedimentation chamber.

[0013] By adopting the above technical solution, when the shaft sleeve and the isolation ring seat rotate relatively, the impurities in the spiral channel are transported along the spiral groove back to the sedimentation chamber, thereby reducing the effect of the impurities moving toward the sealing ring seat.

[0014] Preferably, the sealing ring seat is coaxially arranged with the shaft sleeve, a plurality of sealing ring grooves are provided on the inner ring wall of the sealing ring seat, a group of graphite rings are arranged in the sealing ring grooves, the graphite rings are coaxially arranged with the shaft sleeve, the inner ring wall of the graphite rings protrudes from the inner ring wall of the sealing ring seat, and the back side of the graphite ring is in contact with the inner wall of the sealing ring groove.

[0015] By adopting the above technical solution, multiple graphite rings are fitted with the main shaft to form a multi-layer seal. When the main shaft and the shell rotate relatively, the graphite rings rotate relatively between the sealing ring seat and the main shaft.

[0016] Preferably, a group of clamping ring plates are movably arranged between the graphite rings, the inner ring wall of the clamping ring plates is located in the sealing ring groove, a positioning ring sleeve is arranged between the clamping ring plates, the inner ring wall of the positioning ring sleeve is located in the sealing ring groove, a plurality of positioning through holes are penetrated through the positioning ring sleeve, a clamping spring is arranged in the positioning through hole, and both ends of the clamping spring abut against the opposite surfaces of the clamping ring plates.

[0017] By adopting the above technical solution, the compression spring applies a force to the compression ring plate to move away from each other, so that the compression ring plate abuts the graphite ring against the inner wall of the sealing ring groove, thereby achieving a sealing effect.

[0018] Preferably, a cleaning port and a sewage outlet are provided on the inner wall of the outer ring groove, and both the cleaning port and the sewage outlet pass through the cover plate. A cleaning pipe is connected to the cleaning port, and a cleaning valve is provided on the cleaning pipe. A sewage outlet door is detachably provided on the cover plate, and the sewage outlet door is used to cover the sewage outlet.

[0019] By adopting the above technical solution, when there are a lot of dust and impurities in the sedimentation chamber, open the cleaning valve and the sewage door, and let the cleaning medium pass into the sedimentation chamber through the cleaning pipe, so that the impurities in the sedimentation chamber are discharged from the sewage outlet. When the cleaning of the sedimentation chamber is completed, close the cleaning valve and the sewage door.

[0020] Preferably, one side of the sewage discharge door is rotatably connected to the cover plate, an abutment seat is fixedly provided on the sewage discharge door, and a torsion spring is provided between the abutment seat and the cover plate.

[0021] By adopting the above technical solution, when the weight of the impurities in the sedimentation chamber exceeds the force of the torsion spring, the sewage discharge door automatically opens, and when the impurities are discharged, the sewage discharge door automatically closes.

[0022] In summary, the present application includes at least one of the following beneficial technical effects: 1. By setting the shaft sleeve, sealing ring seat, cover plate, outer ring groove, inner ring groove, sedimentation chamber, isolation ring seat and buffer assembly, the wear of the sealing ring seat by dust and other impurities is reduced, so that the sealing ring seat can reliably seal the main shaft for a long time, reduce the phenomenon of rapid wear and failure of the sealing ring seat, extend the service life of the sealing ring seat, reduce the maintenance frequency of the sealing transmission device, and extend the normal operation time of the main shaft and the housing; 2. By setting the limit ring, labyrinth ring, active gap and labyrinth ring groove, the corrosion resistance and wear resistance of the labyrinth ring are improved, so that the labyrinth ring can be used reliably for a long time, the rapid wear and failure of the labyrinth ring can be reduced, the service life of the labyrinth ring can be extended, the maintenance frequency of the labyrinth ring can be reduced, and the normal operation time of the spindle and the housing can be extended; 3. By setting the isolation ring groove, graphite round hole and graphite layer, the isolation ring seat has high strength, corrosion resistance and good lubrication performance, so that the isolation ring seat can be used reliably for a long time, reduce the rapid wear and failure of the isolation ring seat, extend the service life of the isolation ring seat, reduce the maintenance frequency of the isolation ring seat, and extend the normal operation time of the spindle and the housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a cross-sectional view of a self-cleaning sealing transmission device for a motor spindle in an embodiment of the present application.

[0024] Figure 2 yes Figure 1 Enlarged view of part A.

[0025] Figure 3 yes Figure 1 Enlarged view of part B.

[0026] Figure 4 yes Figure 1 Magnified view of part C.

[0027] Figure 5 It is a schematic diagram showing the positional relationship between the shaft sleeve and the thread groove in the embodiment of the present application.

[0028] Explanation of the reference numerals: 1. sleeve; 11. threaded groove; 12. spiral channel; 2. sealing ring seat; 21. sealing ring groove; 3. cover plate; 31. cleaning port; 311. cleaning pipe; 312. cleaning valve; 32. drain port; 321. drain door; 322. abutment seat; 323. torsion spring; 4. sedimentation chamber; 41. outer ring groove; 42. inner ring groove; 5. isolation ring seat; 51. isolation ring groove; 52. graphite circular hole; 53. graphite layer; 6. buffer assembly; 61. limiting ring sleeve; 62. labyrinth ring sleeve; 63. labyrinth ring groove; 64. movable gap; 7. graphite ring; 71. clamping ring plate; 72. positioning ring sleeve; 721. positioning through hole; 73. clamping spring. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1-5 This application is described in further detail.

[0030] The present application discloses a self-cleaning sealing transmission device for a motor main shaft. Figure 1 , including a sleeve 1, which is made of stainless steel. When the sleeve 1 is sleeved on the main shaft, the sleeve 1 is connected with the main shaft by interference fit. A cover plate 3 is sleeved on the sleeve 1. When the cover plate 3 is installed on the shell through a flange, the gap between the cover plate 3 and the shell is filled with sealant to ensure zero leakage on the joint surface between the cover plate 3 and the shell. A sealing ring seat 2 is assembled at one end of the sleeve 1. The sealing ring seat 2 is coaxially arranged with the sleeve 1. The sealing ring seat 2 is connected with the cover plate 3 by bolts, and the gap between the sealing ring seat 2 and the cover plate 3 is filled with sealant to ensure zero leakage on the joint surface between the cover plate 3 and the sealing ring seat 2. When the sleeve 1 is sleeved on the main shaft, the sealing ring seat 2 is sleeved on the main shaft, and a seal is formed between the sealing ring seat 2 and the main shaft. When the main shaft and the shell rotate relative to each other, the cover plate 3 drives the sealing ring seat 2 to rotate relative to the sleeve 1 synchronously, so as to meet the effect of normal relative rotation between the main shaft and the shell.

[0031] refer to Figure 1An outer ring groove 41 is formed on the side of the cover plate 3 facing the sleeve 1, and an inner ring groove 42 is formed on the side of the sleeve 1 facing the cover plate 3. The outer ring groove 41 and the inner ring groove 42 are arranged opposite to each other, and a sedimentation chamber 4 is formed between the outer ring groove 41 and the inner ring groove 42. An isolation ring seat 5 and a buffer assembly 6 are installed between the cover plate 3 and the sleeve 1. The isolation ring seat 5 and the buffer assembly 6 are both mounted between the cover plate 3 and the sleeve 1. The sedimentation chamber 4 is located between the buffer assembly 6 and the isolation ring seat 5. The isolation ring seat 5 is located between the sedimentation chamber 4 and the sealing ring seat 2. The buffer assembly 6 is used to reduce the flow rate of the fluid entering the sedimentation chamber 4. When the main shaft and the housing are operating in a high-dust environment, the dust-containing fluid first passes through the buffer assembly 6 to reduce the movement speed of the fluid entering the sedimentation chamber 4. When the dust-containing fluid enters the sedimentation chamber 4, the flow rate of the dust-containing fluid decreases, thereby extending the retention time of the dust-containing fluid in the sedimentation chamber, so that the dust and other impurities in the dust-containing fluid are easy to settle in the sedimentation chamber 4, so that most of the dust and other impurities in the dust-containing fluid are bonded and accumulated in the sedimentation chamber 4. After that, the dust-containing fluid containing a small amount of dust and other impurities in the sedimentation chamber 4 continues to move toward the isolation ring seat 5, and the isolation ring seat 5 isolates the impurities in the dust-containing fluid from the sealing ring seat 2, so that the impurities in the dust-containing fluid are not easy to move to the sealing ring seat 2, and the wear of the seal between the sealing ring seat 2 and the main shaft by dust and other impurities is reduced. In this way, the sealing ring seat 2 can reliably seal the main shaft for a long time, reduce the phenomenon of rapid wear and failure of the sealing ring seat 2, extend the service life of the sealing ring seat 2, reduce the maintenance frequency of the sealing transmission device, and extend the normal operation time of the main shaft and the housing.

[0032] Reference Figure 1 and Figure 2The buffer assembly 6 includes a set of limiting rings 61 and a labyrinth ring 62, and the limiting rings 61 and the labyrinth ring 62 are both sleeved on the shaft sleeve 1. The limiting ring 61 is fixedly mounted on the shaft sleeve 1, and the inner ring wall of the limiting ring 61 fits with the outer ring wall of the shaft sleeve 1. The labyrinth ring 62 is interference-mounted on the cover plate 3, and the outer ring wall of the labyrinth ring 62 fits with the inner ring wall of the cover plate 3. The labyrinth ring 62 is located between the limiting rings 61, and there is an active gap 64 between the limiting ring 61 and the shaft sleeve 1 and the labyrinth ring 62. The labyrinth ring 62 is made of tetrafluoroethylene, and a plurality of labyrinth ring grooves 63 are provided on the side of the labyrinth ring 62 facing the shaft sleeve 1, and the labyrinth ring 62, the limiting ring 61, the shaft sleeve 1 and the labyrinth ring grooves 63 form a labyrinth channel. On the one hand, the labyrinth channel slows down the movement speed of the fluid, and on the other hand, the labyrinth channel forms a labyrinth seal. Since there is a movable gap 64 outside the labyrinth ring 62, when the housing and the main shaft rotate relative to each other, the limiting ring 61 and the sleeve 1 rotate relative to the labyrinth ring 62, thereby facilitating the relative rotation of the cover plate 3 and the sleeve 1. Since the labyrinth ring 62 is made of tetrafluoroethylene, the corrosion resistance and wear resistance of the labyrinth ring 62 are improved, so that the labyrinth ring 62 can be used reliably for a long time, the rapid wear and failure of the labyrinth ring 62 is reduced, the service life of the labyrinth ring 62 is extended, the maintenance frequency of the labyrinth ring 62 is reduced, and the normal operation time of the main shaft and the housing is extended.

[0033] Reference Figure 1 and Figure 3 , the cover plate 3 is provided with an isolation ring groove 51 on one side facing the isolation ring seat 5, the isolation ring seat 5 is interference-fitted in the isolation ring groove 51, and the outer ring wall of the isolation ring seat 5 and the end wall of the isolation ring seat 5 are both in contact with the inner wall of the isolation ring groove 51. When the housing and the main shaft rotate relative to each other, the isolation ring seat 5 and the main shaft sleeve 1 rotate relative to each other. A plurality of graphite circular holes 52 are provided on the inner ring wall of the isolation ring seat 5, and a graphite layer 53 is arranged in the graphite circular holes 52. The area of ​​the entire graphite layer 53 accounts for 20% of the area of ​​the inner ring wall of the isolation ring seat 5, and the graphite layer 53 abuts against the outer ring wall of the sleeve 1. Since the graphite layer 53 is made of flexible graphite and the isolation ring seat 5 is made of copper alloy, the isolation ring seat 5 has high strength, corrosion resistance and good lubrication performance. The isolation ring seat 5 can be used reliably for a long time, the rapid wear and failure of the isolation ring seat 5 can be reduced, the service life of the isolation ring seat 5 can be extended, the maintenance frequency of the isolation ring seat 5 can be reduced, and the normal operation time of the main shaft and the housing can be extended.

[0034] In order to prevent dust and other impurities from moving to the sealing ring seat 2, refer to Figures 1 to 5The shaft sleeve 1 is provided with a thread groove 11 on the side facing the isolating ring seat 5, and the rotation direction of the thread groove 11 is determined according to the relative rotation direction of the main shaft and the housing. A spiral channel 12 is formed between the inner wall of the thread groove 11 and the inner ring wall of the isolating ring seat 5, and the spiral channel 12 is connected with the inner ring groove 42. The thread groove 11 is used to send impurities in the spiral channel 12 into the sedimentation chamber 4. When the shaft sleeve 1 and the isolating ring seat 5 rotate relative to each other, the impurities in the spiral channel 12 are transported back to the sedimentation chamber 4 along the spiral groove, thereby reducing the effect of the impurities moving toward the sealing ring seat 2.

[0035] In order to form a seal between the sealing ring seat 2 and the main shaft, refer to Figure 1 and Figure 4 , a plurality of sealing ring grooves 21 are provided on the inner ring wall of the sealing ring seat 2, a group of graphite rings 7 are sleeved in the sealing ring grooves 21, and the graphite rings 7 are coaxially arranged with the shaft sleeve 1. The inner ring wall of the graphite ring 7 protrudes from the inner ring wall of the sealing ring seat 2, and the back of the graphite ring 7 fits with the inner wall of the sealing ring groove 21. A group of clamping ring plates 71 are movably installed between the graphite rings 7, the clamping ring plates 71 are sleeved in the sealing ring grooves 21, and the inner ring wall of the clamping ring plates 71 is located in the sealing ring grooves 21. A positioning ring sleeve 72 is installed between the clamping ring plates 71, the positioning ring sleeve 72 is sleeved in the sealing ring grooves 21, and the inner ring wall of the positioning ring sleeve 72 is located in the sealing ring grooves 21. A plurality of positioning through holes 721 are provided through the positioning ring sleeve 72, and a clamping spring 73 is inserted in the positioning through hole 721, and the two ends of the clamping spring 73 abut against the opposite surface of the clamping ring plate 71. The clamping spring 73 exerts a force to move the clamping ring plate 71 away from each other, so that the clamping ring plate 71 abuts the graphite ring 7 against the inner wall of the sealing ring groove 21, thereby achieving a sealing effect between the graphite ring 7 and the sealing ring groove 21. When the sealing ring seat 2 is sleeved on the main shaft, the inner ring walls of multiple graphite rings 7 are all in contact with the main shaft, thereby forming a multi-layer seal between the sealing ring seat 2 and the main shaft. When the main shaft and the housing rotate relative to each other, the graphite ring 7 rotates relative to each other between the sealing ring seat 2 and the main shaft.

[0036] To clean the settling chamber, refer to Figure 1 and Figure 2The inner wall of the outer ring groove 41 is provided with a cleaning port 31 and a drain port 32, and both the cleaning port 31 and the drain port 32 penetrate the cover plate 3. The cleaning port 31 is connected with a cleaning pipe 311, and a cleaning valve 312 is installed on the cleaning pipe 311. A drain door 321 is installed on the cover plate 3, and the drain door 321 is used to cover the drain port 32. One side of the drain door 321 is rotatably connected with the cover plate 3, and an abutment seat 322 is installed on the drain door 321, and a torsion spring 323 is welded between the abutment seat 322 and the cover plate 3. When there are a lot of dust and impurities in the sedimentation chamber 4, the cleaning valve 312 and the drain door 321 are opened, and the cleaning medium is passed from the cleaning pipe 311 into the sedimentation chamber 4 for spraying and flushing, so that the impurities in the sedimentation chamber 4 are discharged from the drain port 32. When the sedimentation chamber 4 is cleaned, the cleaning valve 312 and the drain door 321 are closed. When the weight of the impurities in the sedimentation chamber 4 exceeds the force of the torsion spring 323, the sewage discharge door 321 automatically opens, and when the impurities are discharged, the sewage discharge door 321 automatically closes.

[0037] The implementation principle of a self-cleaning sealing transmission device for a motor spindle in the embodiment of the present application is as follows: when the spindle and the housing rotate relative to each other, the cover plate 3, the labyrinth ring sleeve 62, the isolation ring seat 5, the sealing ring seat 2 and the housing remain relatively still, and the spindle, the shaft sleeve 1 and the limiting ring sleeve 61 remain relatively still, thereby achieving the effect of rotational connection between the spindle and the housing. Among them, a labyrinth channel is formed between the labyrinth ring groove 63, the limiting ring sleeve 61 and the shaft sleeve 1, and the labyrinth channel forms a primary seal; the isolation ring seat 5 blocks the dust-containing fluid to form a secondary seal; the graphite ring 7 abuts against the sealing ring seat 2 and the spindle to form a tertiary seal, thereby achieving the effect of efficient sealing between the spindle and the housing. When the spindle and the housing rotate relative to each other in a high dust environment, the dust-containing fluid first decelerates through the labyrinth channel, thereby reducing the moving speed of the fluid entering the sedimentation chamber 4, facilitating the sedimentation of impurities in the dust-containing fluid in the sedimentation chamber, and making most of the dust and other impurities in the dust-containing fluid adhere and accumulate in the sedimentation chamber 4. Afterwards, the fluid containing a small amount of dust and other impurities in the sedimentation chamber 4 continues to move toward the isolation ring seat 5, and the isolation ring seat 5 isolates the impurities in the dust-containing fluid from the sealing ring seat 2, so that the impurities in the dust-containing fluid are not easy to continue to move toward the graphite ring 7, reducing the wear of the graphite ring 7 by dust and other impurities. In this way, the graphite ring 7 can reliably seal the main shaft for a long time, reduce the phenomenon of rapid wear and failure of the graphite ring 7, extend the service life of the graphite ring 7, reduce the maintenance frequency of the graphite ring 7, and extend the normal operation time of the main shaft and the housing.

[0038] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A self-cleaning sealing transmission device for a motor main shaft, comprising a shaft sleeve (1), a sealing ring seat (2) being arranged at one end of the shaft sleeve (1), a cover plate (3) being sleeved on the shaft sleeve (1), and the cover plate (3) being connected to the sealing ring seat (2), characterized in that: The cover plate (3) is provided with an outer ring groove (41) on one side facing the shaft sleeve (1), and the shaft sleeve (1) is provided with an inner ring groove (42) on one side facing the cover plate (3). The outer ring groove (41) and the inner ring groove (42) are arranged opposite to each other, and a sedimentation chamber (4) is formed between the outer ring groove (41) and the inner ring groove (42). An isolating ring seat (5) and a buffer assembly (6) are arranged between the cover plate (3) and the shaft sleeve (1), and the sedimentation chamber (4) is located between the buffer assembly (6) and the isolating ring seat (5). The buffer assembly (6) is used to reduce the flow rate of the fluid entering the sedimentation chamber (4), and the isolating ring seat (5) is located between the sedimentation chamber (4) and the sealing ring seat (2).

2. A self-cleaning sealed transmission device for a motor main shaft according to claim 1, characterized in that: The buffer assembly (6) comprises a group of limiting rings (61) and a labyrinth ring (62). The limiting rings (61) and the labyrinth ring (62) are both sleeved on the shaft sleeve (1). The limiting ring (61) is fixedly connected to the shaft sleeve (1). The inner ring wall of the limiting ring (61) fits with the outer ring wall of the shaft sleeve (1). The labyrinth ring (62) is connected to the cover plate (3). The outer ring wall of the labyrinth ring (62) fits with the inner ring wall of the cover plate (3). The labyrinth ring (62) is made of tetrafluoroethylene. The labyrinth ring (62) is located between the limiting rings (61). There is an active gap (64) between the limiting ring (61) and the shaft sleeve (1) and the labyrinth ring (62). The labyrinth ring (62) is provided with a plurality of labyrinth grooves (63) facing the side of the shaft sleeve (1).

3. The self-cleaning sealing transmission device for a motor main shaft according to claim 1, characterized in that: The isolation ring seat (5) is made of copper alloy. The cover plate (3) is provided with an isolation ring groove (51) on one side facing the isolation ring seat (5). The isolation ring seat (5) is arranged in the isolation ring groove (51). The outer ring wall of the isolation ring seat (5) and the end wall of the isolation ring seat (5) are both in contact with the inner wall of the isolation ring groove (51). The inner ring wall of the isolation ring seat (5) is provided with a plurality of graphite circular holes (52). A graphite layer (53) is arranged in the graphite circular holes (52). The area of ​​the entire graphite layer (53) accounts for 20% of the area of ​​the inner ring wall of the isolation ring seat (5). The graphite layer (53) abuts against the outer ring wall of the shaft sleeve (1).

4. A self-cleaning sealing transmission device for a motor main shaft according to claim 3, characterized in that: The shaft sleeve (1) is provided with a thread groove (11) on one side facing the isolating ring seat (5), a spiral channel (12) is formed between the inner wall of the thread groove (11) and the inner ring wall of the isolating ring seat (5), the spiral channel (12) and the inner ring groove (42) are interconnected, and the thread groove (11) is used to send impurities in the spiral channel (12) into the sedimentation chamber (4).

5. The self-cleaning sealing transmission device for a motor main shaft according to claim 1, characterized in that: The sealing ring seat (2) is coaxially arranged with the shaft sleeve (1); a plurality of sealing ring grooves (21) are provided on the inner ring wall of the sealing ring seat (2); a group of graphite rings (7) are arranged in the sealing ring grooves (21); the graphite rings (7) are coaxially arranged with the shaft sleeve (1); the inner ring wall of the graphite rings (7) protrudes from the inner ring wall of the sealing ring seat (2); and the back side of the graphite ring (7) is in contact with the inner wall of the sealing ring groove (21).

6. A self-cleaning sealing transmission device for a motor main shaft according to claim 5, characterized in that: A group of clamping ring plates (71) are movably arranged between the graphite rings (7), the inner ring wall of the clamping ring plates (71) is located in the sealing ring groove (21), a positioning ring sleeve (72) is arranged between the clamping ring plates (71), the inner ring wall of the positioning ring sleeve (72) is located in the sealing ring groove (21), a plurality of positioning through holes (721) are penetrated through the positioning ring sleeve (72), a clamping spring (73) is arranged in the positioning through hole (721), and two ends of the clamping spring (73) are in contact with the opposite surface of the clamping ring plate (71).

7. The self-cleaning sealing transmission device for a motor main shaft according to claim 1, characterized in that: The inner wall of the outer ring groove (41) is provided with a cleaning port (31) and a sewage discharge port (32); the cleaning port (31) and the sewage discharge port (32) both penetrate the cover plate (3); a cleaning pipe (311) is connected to the cleaning port (31); a cleaning valve (312) is provided on the cleaning pipe (311); a sewage discharge door (321) is detachably provided on the cover plate (3); the sewage discharge door (321) is used to cover the sewage discharge port (32).

8. A self-cleaning sealing transmission device for a motor main shaft according to claim 7, characterized in that: One side of the sewage discharge door (321) is rotatably connected to the cover plate (3); an abutment seat (322) is fixedly arranged on the sewage discharge door (321); and a torsion spring (323) is arranged between the abutment seat (322) and the cover plate (3).

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