A direct-drive structure for an air-cooled island-type permanent magnet motor

Abstract

This invention discloses an air-cooled island-type direct-drive structure for permanent magnet motors, applicable to the field of motor drive structures. The output shaft of the permanent magnet motor and the shaft of the axial flow fan are directly and rigidly connected via a coupling, replacing the traditional motor + reducer solution. This avoids problems such as regular lubrication, oil leakage, pollution, and complex maintenance associated with reducers, improving system reliability and reducing maintenance costs. By adding a visual inspection ring, a liquid control plate, and a camera, a synchronous and independent loosening monitoring mechanism is established. This mechanism monitors the tightness of multiple bolts on the coupling in real time. In the early stages of localized loosening of a single bolt, the visual change caused by the overflow of colored liquid triggers an abnormal image warning. This provides timely and effective early warning before the stability of the entire direct-drive structure is compromised. Furthermore, the visual inspection ring is effectively cleaned by staged rinsing to remove residual colored liquid, restoring its cleanliness and enabling multiple uses.

Description

Technical Field

[0001] This invention relates to the field of motor drive structures, and in particular to a direct drive structure for an air-cooled island type permanent magnet motor. Background Technology

[0002] With the continuous improvement of energy conservation and safety awareness, power plants are increasingly demanding upgrades to their pipeline cooling systems. Currently, in the field of auxiliary equipment systems for power plants, a combined transmission structure of "asynchronous motor + reducer" is widely used to drive axial flow fans, thereby achieving the goal of pipeline cooling. This application is extremely widespread; for example, the fan drive system of air-cooled islands commonly uses a series structure of "asynchronous motor + reducer." Air-cooled islands are core equipment in thermal power plants that use air as a cooling medium to cool high-temperature steam. They mainly consist of radiator clusters, axial flow fan matrices, and intelligent control systems. They employ direct or indirect air-cooling technologies, achieving steam condensation through heat exchange between finned tube bundles and air.

[0003] The aforementioned combined transmission method, employing a two-stage transmission design, suffers from significant efficiency losses. Power must be output from the asynchronous motor and then transmitted through the intermediate stage of the reducer before reaching the actuators. During this process, energy losses occur due to meshing and rotational friction of the mechanical transmission components, leading to a reduction in the overall transmission efficiency of the entire system. Simultaneously, the series connection between the asynchronous motor and the reducer significantly increases the overall installation height of the equipment, shifting the system's center of gravity upwards. During operation, the rotational vibration of the asynchronous motor itself and the vibration generated by the meshing gears within the reducer superimpose, forming a compound vibration. This compound vibration not only increases the vibration amplitude of the equipment but may also trigger resonance risks, accelerate wear on equipment components, and even lead to equipment failure and damage. It increases the frequency and cost of equipment inspection and maintenance, and the reducer is also prone to problems such as oil leaks and difficult maintenance, causing numerous challenges to the daily operation and maintenance work of the power plant.

[0004] To avoid the above problems, Chinese patent CN205304499U discloses a permanent magnet motor direct drive system and a fan system. The permanent magnet motor direct drive system includes a frequency converter and a permanent magnet motor connected in sequence. The permanent magnet motor is connected to the driven equipment through a coupling. Its fan system is: frequency converter + permanent magnet motor + fan. The axial flow fan of the air-cooled island is directly driven by a low-speed (generally, the speed of the air-cooled island fan is within 80 rpm) permanent magnet motor, eliminating the need for a reducer. This means that there is no need for regular lubrication, no oil leakage pollution from the reducer, and the hassle of returning the reducer to the factory for repair, thus reducing the workload of maintenance.

[0005] The stability of the aforementioned direct-drive structure depends on the connection stability of the coupling. However, the fastening bolts on the coupling are prone to loosening under long-term use and rotational vibration, and it is difficult to detect and warn of this in a timely manner. This poses certain safety hazards to the operation of the wind turbine. Although there are existing technologies that integrate micro sensors into the bolts or washers to monitor loosening, due to the high cost and complex process, such smart bolts or washers are difficult to apply on a large scale (they are generally used in high-end and special equipment such as aerospace and rail transportation). Summary of the Invention

[0006] The core of this invention lies in solving the problem of difficulty in timely detection and early warning when fastening bolts on couplings become loose in the prior art by using a loosening detection plate and a camera in combination. At the same time, it can provide timely and effective early warning of local loosening before the stability of the entire direct drive structure is compromised.

[0007] To solve the above problems, the present invention adopts the following technical solution.

[0008] An air-cooled island type direct-drive structure for permanent magnet motors includes a permanent magnet motor, the shaft of an axial flow fan, and a coupling installed between the two. One end of the coupling is sleeved on the outer end of the output shaft of the permanent magnet motor, and the other end of the coupling is threaded with multiple evenly distributed bolts. A flow guide is fixedly sleeved on the outer end of the permanent magnet motor, and an independent fan is fixedly connected to the outer end of the flow guide. A loosening check plate is sleeved on the outer end of the coupling, and the loosening check plate is located between the end face of the coupling and the head of the bolt. A camera is fixedly connected to the end face of the permanent magnet motor near the output shaft.

[0009] The loosening inspection plate includes a visual inspection ring and multiple liquid control plates corresponding to the bolts. The visual inspection ring includes a ring plate with multiple screw holes corresponding to the bolts. The bolts move through the liquid control plates and are threaded into the screw holes, couplings, and machine shafts. The upper end face of the ring plate has multiple liquid-gathering ring grooves and multiple flow-guiding ring grooves. The liquid-gathering ring grooves are located on the outside of the screw holes, and the flow-guiding ring grooves are located on the outside of the liquid-gathering ring grooves. The inside of the ring plate has multiple arc-shaped channels. The arc-shaped channels and the liquid-gathering ring grooves are spaced apart and interconnected.

[0010] The ring plate also has multiple inspection arc cavities inside, which are located on the upper side of multiple arc-shaped channels. The inner bottom surface of the guide ring groove has a connecting hole that communicates with the adjacent inspection arc cavities. The liquid-gathering ring groove and the arc-shaped channels are used to fill colored liquid. Multiple transparent strips are fixedly connected to the upper end face of the ring plate. The multiple transparent strips are located on the upper side of multiple inspection arc cavities, and the transparent strips are fixedly inserted through the ring plate and extend to the upper inner wall of the inspection arc cavity.

[0011] Furthermore, a pair of infusion tubes with valves are fixedly connected to the circumferential surface of the ring plate, and the pair of infusion tubes are axially symmetrical about the center line of the ring plate. The ends of the infusion tubes are fixedly inserted through the ring plate and connected to the arc-shaped channel.

[0012] Furthermore, the liquid control plate includes a ring plate, an open sealing ring is embedded and fixedly connected to the end face of the ring plate near the inspection ring, an inner ring groove is formed on the end face of the ring plate near the inspection ring, one end of a waterproof sleeve is fixedly connected to the bottom of the inner ring groove, and the other end of the waterproof sleeve is fixedly connected to the upper end face of the ring plate.

[0013] Furthermore, when the bolt passes through the ring and is screwed into the screw hole, and the liquid control plate is in close contact with the inspection ring, the open sealing ring is in contact with the outer edge of the liquid-collecting ring groove, and the flow guiding ring groove is located between the open sealing ring and the inner ring groove.

[0014] Furthermore, a sealing ring is fixedly connected to the inner end of the ring plate, and the sealing ring is made of water-absorbing and expanding material.

[0015] Furthermore, the waterproof sleeve is made of a waterproof flexible material, and the length of the waterproof sleeve is greater than the depth of the inner ring groove.

[0016] Optionally, multiple sealing plates are slidably connected to the circumferential surface of the ring plate. The multiple sealing plates and multiple liquid-gathering ring grooves are distributed at intervals. One end of the sealing plate is located on the outside, and the other end extends to the inside of the arc-shaped channel.

[0017] Optionally, the sealing plate includes an end, a thin plate, and a plug, with the thin plate fixedly connected between the end and the plug, and the end located on the outside.

[0018] Optionally, an inner groove is provided on the outer wall of the arc-shaped channel, and an outer groove communicating with the outside is provided on the inner wall of the inner groove away from the arc-shaped channel. The thin plate is slidably connected to the inside of the outer groove, and the flow guide ring groove is slidably connected to the inside of the inner groove. The depth of the arc-shaped channel in the vertical direction is the same as that of the plug, and a slot matching the plug is provided on the inner wall of the arc-shaped channel.

[0019] Furthermore, an air-gathering cavity is provided on the inner end face of the air guide shroud, and the air outlet of the independent fan is connected to the air-gathering cavity. A guide groove is provided on the upper inner wall of the air-gathering cavity.

[0020] Compared with the prior art, the advantages of this invention are:

[0021] (1) In this scheme, the output shaft of the permanent magnet motor and the shaft of the axial flow fan are directly rigidly connected by a coupling, replacing the traditional "motor + reducer" scheme. This eliminates the reducer link, avoids problems such as regular lubrication, oil leakage pollution, and complex maintenance caused by the reducer, improves system reliability, and reduces maintenance costs. At the same time, an independent fan is added, and the airflow is guided to flow axially along the surface of the permanent magnet motor through the guide shroud, which solves the problem of insufficient heat dissipation of the coaxial fan at low speed and improves the operating stability of the permanent magnet motor in high temperature environment.

[0022] (2) By adding a visual inspection ring, liquid control plate and camera, it is used as a synchronous and independent loosening monitoring mechanism to monitor the tightness of multiple bolts in real time. In the early stage of local loosening of a single bolt, the visual changes caused by the overflow of colored liquid are used to trigger an abnormal image warning. Before the stability of the entire direct drive structure is destroyed, the local loosening is warned in a timely and effective manner.

[0023] (3) A sliding sealing plate is added to the inspection ring. The opening and closing of the arc-shaped channel is controlled by inserting and removing the sealing plate, so as to realize the staged directional flushing of the inside of the inspection ring, reduce the situation of incomplete flushing of the inspection arc cavity, and facilitate the reuse of the loose inspection piece. Attached Figure Description

[0024] Figure 1 This is a perspective view of the first embodiment of the present invention;

[0025] Figure 2 This is an exploded view of the first embodiment of the present invention;

[0026] Figure 3 This is a side view of the structure of the first embodiment of the present invention;

[0027] Figure 4 This is a perspective view of the second embodiment of the present invention;

[0028] Figure 5 This is an exploded view of the second embodiment of the present invention;

[0029] Figure 6 This is a perspective view of the loosening detection piece according to the second embodiment of the present invention;

[0030] Figure 7 This is a perspective view of the liquid control sheet according to the second embodiment of the present invention;

[0031] Figure 8 This is a perspective view of the inspection ring according to the second embodiment of the present invention;

[0032] Figure 9 This is a schematic diagram of the top surface structure of the inspection ring according to the second embodiment of the present invention;

[0033] Figure 10This is a partial side view of the loosening detection strip of the second embodiment of the present invention during normal use;

[0034] Figure 11 This is a schematic diagram of a partial side view of the bolt loosening detection plate in the second embodiment of the present invention;

[0035] Figure 12 This is a perspective view of the third embodiment of the present invention;

[0036] Figure 13 The three-dimensional inspection ring of the third embodiment of the present invention Figure 1 ;

[0037] Figure 14 The three-dimensional inspection ring of the third embodiment of the present invention Figure 2 ;

[0038] Figure 15 This is a partial side view of the sealing plate in the third embodiment of the present invention;

[0039] Figure 16 These are partial side view diagrams of the rinsing process in the second and third embodiments of the present invention.

[0040] Figure 17 This is a partial side view of the structure during rinsing in the third embodiment of the present invention.

[0041] Explanation of the labels in the diagram:

[0042] 1. Permanent magnet motor, 2. Shaft, 3. Coupling, 4. Bolt, 5. Independent fan, 6. Flow guide, 601. Air collection cavity, 602. Flow guide groove, 7. Inspection ring, 70. Ring plate, 7001. Screw hole, 7002. Liquid collection ring groove, 7003. Flow guide ring groove, 7004. Arc channel, 7005. Inspection arc cavity, 7006. Slot, 7007. Inner sliding groove, 7008. Outer sliding groove, 71. Infusion tube, 72. Transparent strip, 73. Sealing plate, 7301. End, 7302. Thin plate, 7303. Plug, 8. Liquid control plate, 801. Ring plate, 802. Open sealing ring, 803. Inner ring groove, 804. Waterproof sleeve, 805. Sealing ring, 9. Camera. Detailed Implementation

[0043] The technical solutions will now be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention.

[0044] First implementation method:

[0045] Please see Figure 1 and Figure 2A direct-drive structure for an air-cooled island type permanent magnet motor includes a permanent magnet motor 1, a shaft 2 of an axial flow fan, and a coupling 3 installed between the two. One end of the coupling 3 is sleeved on the outer end of the output shaft of the permanent magnet motor 1, and the other end of the coupling 3 is threadedly connected to the shaft 2 by multiple evenly distributed bolts 4. The bolts 4 are existing high-strength bolts with a performance grade of 8.8 or higher. A flow guide shroud 6 is fixedly sleeved on the outer end of the permanent magnet motor 1, and an independent fan 5 is fixedly connected to the outer end of the flow guide shroud 6. Please refer to [link to relevant documentation]. Figure 3 The inner end face of the air guide shroud 6 is provided with an air collection cavity 601. The air outlet of the independent fan 5 is connected to the air collection cavity 601. The upper inner wall of the air collection cavity 601 is provided with a guide groove 602. The air force generated by the independent fan 5 will directly enter the air collection cavity 601, and then flow along the outer surface of the permanent magnet motor 1 under the guidance of the guide groove 602, so as to achieve the air cooling effect.

[0046] This application adopts an integrated direct drive transmission path of permanent magnet motor 1 output shaft + axial flow fan shaft 2. The two are connected by coupling 3 and bolt 4 to achieve a stable rigid connection, which replaces the combined transmission unit of motor + reducer in the traditional solution, eliminates intermediate transmission links, and effectively avoids problems such as regular oiling, oil leakage pollution and high maintenance difficulty caused by reducer.

[0047] Furthermore, considering the actual operating conditions of the air-cooled island, the permanent magnet motor 1 typically operates at a low speed range of around 80 rpm. Under these speed conditions, if a traditional coaxial fan structure is used, its heat dissipation effect is negligible, essentially equivalent to natural heat dissipation, making it difficult to meet the technical requirements for efficient heat dissipation of the motor body. Therefore, this embodiment adds an independent fan 5 to the side of the permanent magnet motor 1. Guided by the air guide shroud 6, the airflow generated by the independent fan 5 is discharged along the axial direction of the permanent magnet motor 1 and close to its outer surface, achieving a wind-cooling effect on its outer surface. The independent fan 5 can be independently started, stopped, and speed-adjusted according to the actual heat dissipation needs of the permanent magnet motor 1, with a maximum speed of 3000 rpm, which can significantly enhance the forced convection of airflow, thereby achieving efficient heat dissipation of the permanent magnet motor 1.

[0048] Second implementation method:

[0049] This embodiment, based on the first embodiment, adds a loosening inspection plate and a camera 9 for use in conjunction, as detailed below: Please refer to Figure 4 and Figure 5 A loosening check plate is fitted on the outer end of the coupling 3, and the loosening check plate is located between the end face of the coupling 3 and the head of the bolt 4. A camera 9 is fixedly connected to the housing end face of the permanent magnet motor 1 near the output shaft.

[0050] Combination Figure 5 and Figure 6As shown, the loosening inspection plate includes an inspection ring 7 and multiple liquid control plates 8 corresponding to bolts 4. The inspection ring 7 includes a ring plate 70, on which multiple screw holes 7001 corresponding to bolts 4 are opened. During installation, bolts 4 move through the liquid control plates 8 and are sequentially threaded into the screw holes 7001, coupling 3 and machine shaft 2, thereby fixing the liquid control plates 8, ring plate 70, coupling 3 and bolts 4. Multiple liquid-gathering ring grooves 7002 and multiple flow-guiding ring grooves 7003 are opened on the upper end face of the ring plate 70. The multiple liquid-gathering ring grooves 7002 are located outside the multiple screw holes 7001, and the multiple flow-guiding ring grooves 7003 are located outside the multiple liquid-gathering ring grooves 7002.

[0051] Combination Figure 8 and Figure 9 As shown, the annular plate 70 has multiple arc-shaped channels 7004 inside. These arc-shaped channels 7004 and multiple liquid-gathering annular grooves 7002 are spaced apart and interconnected. Both the liquid-gathering annular grooves 7002 and the arc-shaped channels 7004 are used to fill colored liquid, and the colored liquid can flow between them. The colored liquid can be made by mixing pigment and water. The annular plate 70 also has multiple inspection arc cavities 7005 inside. These inspection arc cavities 7005 are located above the multiple arc-shaped channels 7004, and the two are not directly connected (in conjunction with...). Figure 10 As shown, the inner bottom surface of the guide ring groove 7003 is provided with a connecting hole that communicates with the adjacent inspection arc cavity 7005.

[0052] Please see Figure 8 and Figure 9 A pair of infusion tubes 71 with valves are fixedly connected to the circumferential surface of the ring plate 70. The pair of infusion tubes 71 are symmetrically distributed about the center line of the ring plate 70. The ends of the infusion tubes 71 are fixedly connected through the ring plate 70 and communicate with the arc-shaped channel 7004. Colored liquid can be injected into the arc-shaped channel 7004 through the infusion tubes 71 to detect the loosening of the bolt 4. In addition, when the liquid control plate 8 is not used, the inner walls of the liquid-gathering ring groove 7002, the arc-shaped channel 7004, and the visual inspection arc cavity 7005 can be flushed by using the pair of infusion tubes 71 to effectively remove the colored liquid inside.

[0053] Please see Figure 9 Multiple transparent strips 72 are fixedly connected to the upper end face of the ring plate 70. The multiple transparent strips 72 are located on the upper side of multiple inspection arc cavities 7005 respectively, and the transparent strips 72 are fixedly connected through the ring plate 70 and extend to the upper inner wall of the inspection arc cavity 7005. Through the transparent strips 72, it is possible to directly observe or observe whether there is colored liquid inside the inspection arc cavity 7005 by visual inspection or by image acquisition.

[0054] Please see Figure 7 and Figure 10The liquid control plate 8 includes a ring plate 801. An open sealing ring 802 is embedded and fixedly connected to the end face of the ring plate 801 near the inspection ring 7. An inner ring groove 803 is formed on the end face of the ring plate 801 near the inspection ring 7. One end of a waterproof sleeve 804 is fixedly connected to the bottom of the inner ring groove 803, and the other end of the waterproof sleeve 804 is fixedly connected to the upper end face of the ring plate 70. The outer diameter of the open sealing ring 802 is larger than the outer diameter of the liquid-coating ring groove 7002, but smaller than the inner diameter of the guide ring groove 7003. The inner diameter of the open sealing ring 802 is smaller than the inner diameter of the liquid-coating ring groove 7003. The inner diameter of the inner ring groove 803 is larger than the outer diameter of the guide ring groove 7003. Through the above dimensional relationship, it is achieved that when the bolt 4 passes through the ring plate 801 and is screwed into the screw hole 7001, and the liquid control plate 8 is tightly fitted with the inspection ring 7, the opening sealing ring 802 is fitted to the outer edge of the groove opening of the liquid-collecting ring groove 7002, and the guide ring groove 7003 is located between the opening sealing ring 802 and the inner ring groove 803. The opening sealing ring 802 seals the groove opening of the liquid-collecting ring groove 7002, so that the colored liquid inside is stably stored and not easily overflowed.

[0055] This embodiment, by adding a visual inspection ring 7, a liquid control plate 8, and a camera 9, enables timely monitoring of whether multiple bolts 4 are loose, further ensuring the stability of the direct drive structure between the permanent magnet motor 1 and the shaft 2, and improving the operational safety of the axial flow fan. The monitoring principle is as follows:

[0056] I. Installation: When connecting the permanent magnet motor 1 and the shaft 2 via the coupling 3, first place the inspection ring 7 on the outside of the coupling 3, aligning the screw hole 7001 with the bolt hole on the coupling 3. Then, connect one end of the coupling 3 to the output shaft of the permanent magnet motor 1, and align the other end of the coupling 3 with the shaft 2 of the axial flow fan. Insert the bolt 4 from the inside of the liquid control plate 8, and then gradually screw it into the screw hole 7001, the coupling 3, and the shaft 2 to tighten the liquid control plate 8, the inspection ring 7, the coupling 3, and the shaft 2. At this time, the positions of the inspection ring 7 and the liquid control plate 8 are as follows: Figure 10 As shown, the open sealing ring 802 seals the opening of the liquid ring groove 7002.

[0057] II. Colored liquid filling and normal use status: After all bolts 4 are installed, as follows: Figure 9 and Figure 10As shown, colored liquid is injected into the arc-shaped channel 7004 through the infusion tube 71. Through the connection between the arc-shaped channel 7004 and the liquid-aggregating ring groove 7002, the colored liquid gradually fills the interior of the multiple arc-shaped channels 7004 and the liquid-aggregating ring groove 7002. Since the bolt 4 is tightened at this time, the liquid control plate 8 is tightly fitted to the ring plate 70. In addition, the sealing effect of the opening sealing ring 802 on the liquid-aggregating ring groove 7002 prevents the colored liquid entering the liquid-aggregating ring groove 7002 from overflowing between the ring plate 70 and the liquid control plate 8 after filling to the inside of the opening sealing ring 802. At this time, the inspection arc cavity 7005 is observed through the transparent strip 72. The system will remain in a liquid-free state. After the permanent magnet motor 1 is started, it will rotate at a low speed. The camera 9 will capture images of the upper surface of the ring plate 70 in this state and transmit them to the background monitoring terminal. The background monitoring terminal will perform image recognition to obtain initial image data. During the operation of the permanent magnet motor 1, the camera 9 will capture images of the upper surface of the ring plate 70 in real time. The background monitoring terminal will analyze the real-time images and compare them with the initial image data to detect the abnormality of loose bolt 4 in a timely manner (please refer to the next paragraph for details). The background monitoring personnel can also manually view and judge the real-time images.

[0058] III. Loosening test: such as Figure 11 As shown, during the operation of the permanent magnet motor 1, when a bolt 4 becomes loose, the clamping effect of the bolt 4 on the liquid control plate 8 below it will gradually fail. As the output shaft of the permanent magnet motor 1 rotates continuously, the liquid control plate 8 and the ring plate 70 will no longer fit tightly, and the open sealing ring 802 will lose its sealing effect on the liquid collection ring groove 7002. At this time, the colored liquid inside the open sealing ring 802 or the liquid collection ring groove 7002 will automatically overflow between the liquid control plate 8 and the ring plate 70 and diffuse outwards, then flow into the guide ring groove 7003, and then enter a pair of nearby inspection arc cavities 7005 through the connecting hole. At this time, the camera 9 can collect abnormal images when there is colored liquid inside the inspection arc cavity 7005. The background monitoring terminal identifies and analyzes the abnormal images and compares them with the initial image data. It determines that there is a significant difference between the two data, thereby timely issuing a loosening fault warning, so that the background monitoring personnel can verify and handle it in a timely manner.

[0059] It should be noted that when one bolt 4 becomes loose, it affects the stability between the liquid control plate 8 below it and the ring plate 70, but does not significantly affect the stability of the other liquid control plates 8. Since the other bolts 4 are not loose, the direct drive structure between the permanent magnet motor 1 and the shaft 2 remains in a relatively stable connection state. Therefore, the synchronous and independent loosening monitoring mechanism provided by this application for multiple bolts 4 can provide timely and effective early warning of local loosening before the stability of the entire direct drive structure is compromised.

[0060] Please see Figure 11 The waterproof sleeve 804 is made of waterproof flexible material, and its length is greater than the depth of the inner ring groove 803. When the inspection ring 7 and the liquid control plate 8 are tightly attached, the waterproof sleeve 804 is in a relaxed state and stored in the inner ring groove 803. The difference between the two can be set to 0.5cm, which prevents the waterproof sleeve 804 from being too long and affecting the attachment of the inspection ring 7 and the liquid control plate 8. At the same time, it ensures that when the liquid control plate 8 is loose, there is a certain amount of room for movement, which facilitates the overflow of colored liquid and its flow into the guide ring groove 7003. The main function of the waterproof sleeve 804 is to prevent the colored liquid from overflowing further and flowing randomly to other positions on the upper surface of the ring plate 70, so as not to cause pollution and safety hazards to nearby electrical equipment.

[0061] Please see Figure 11 A sealing ring 805 is fixedly connected to the inner end of the ring plate 801. The sealing ring 805 is made of water-absorbing and expanding material. The sealing ring 805 also plays the role of restricting the random overflow of colored liquid. When the colored liquid overflowing between the liquid control plate 8 and the ring plate 70 comes into contact with the sealing ring 805, the water inside will cause the sealing ring 805 to expand when it comes into contact with water, which will improve the tightness between the sealing ring 805 and the bolt 4, making it difficult for the colored liquid to flow out randomly along the gap between the ring plate 801 and the bolt 4.

[0062] After the loose bolts 4 are treated, a visual restoration process can be selectively performed on the inspection ring 7, as follows: First, drain a large amount of colored liquid from inside the inspection ring 7 through the infusion tube 71. Then, remove the remaining bolts 4, and disassemble the inspection ring 7 and the liquid control plate 8 from the coupling 3. Use external sealing plugs to seal the hollow area of ​​the ring plate 801 (the inner hole through which the bolts 4 pass) and the end of the bolt hole 7001 that is far from each other. Use one infusion tube 71 as the cleaning water injection end, and inject the cleaning water into the arc-shaped channel 700 through this infusion tube 71. Clean water is continuously and rapidly injected into the 4th channel. The clean water flows dispersedly along both sides of the arc-shaped channel 7004 and enters the remaining arc-shaped channels 7004 and the liquid-gathering ring trough 7002 in sequence. At the same time, under water pressure, the inspection ring 7 and the liquid control plate 8 move away from each other, and the clean water enters the gap between them and enters the inspection arc cavity 7005 through the guide ring trough 7003. This achieves the rinsing of the residual colored liquid in the liquid-gathering ring trough 7002, the arc-shaped channel 7004 and the inspection arc cavity 7005. The rinsing wastewater is discharged and collected through another infusion pipe 71.

[0063] Once the inspection arc cavity 7005 has regained a certain level of cleanliness, the loose inspection plate (i.e., the inspection ring 7 and the liquid control plate 8) can be reused. During the above rinsing process, the following drawback may exist: most of the cleaning water may flow primarily between the liquid collection ring groove 7002 and the arc-shaped channel 7004, resulting in insufficient rinsing force on the inspection arc cavity 7005, making it difficult to restore its cleanliness. To address this issue, the following third implementation method can be adopted.

[0064] The third implementation method:

[0065] This embodiment adds a sealing plate 73 based on the second embodiment. The specific configuration is as follows: Please refer to... Figure 12 and Figure 13 Multiple sealing plates 73 are slidably connected on the circumferential surface of the ring plate 70. The multiple sealing plates 73 and multiple liquid-gathering ring grooves 7002 are distributed at intervals. One end of the sealing plate 73 is located outside, and the other end extends to the inner side of the arc-shaped channel 7004.

[0066] Combination Figure 13 , Figure 14 and Figure 15 As shown, the sealing plate 73 includes an end 7301, a thin plate 7302, and a plug 7303. The thin plate 7302 is fixedly connected between the end 7301 and the plug 7303. The end 7301 is located to the outside. An inner groove 7007 is formed on the outer wall of the arc-shaped channel 7004. An outer groove 7008 communicating with the outside is formed on the inner wall of the inner groove 7007 away from the arc-shaped channel 7004. The thin plate 7302 is slidably connected to the inside of the outer groove 7008, and the two are in a sliding close contact. In the sealed state, the colored liquid in the arc-shaped channel 7004 is not easy to overflow through the connection between the two. The guide ring groove 7003 is slidably connected to the inside of the inner slide groove 7007. The vertical depth of the arc-shaped channel 7004 is the same as that of the plug 7303. The inner wall of the arc-shaped channel 7004 is provided with a slot 7006 that matches the plug 7303. The thickness of the plug 7303 is greater than the vertical dimension of the groove opening of the outer slide groove 7008, so that the sealing plate 73 is not easy to detach from the outer slide groove 7008.

[0067] During normal use, the sealing plate 73 is in a partially extended state, such as... Figure 15 As shown in the uppermost structural state, only part of the end of the sealing plate 73 is located in the arc-shaped channel 7004, and it does not block it. At this time, colored liquid can be injected into the arc-shaped channel 7004 normally, and it does not affect the flow of colored liquid between the multiple arc-shaped channels 7004 and the liquid-gathering ring groove 7002.

[0068] With the sealing plate 73 in place, the rinsing method of this application includes the following:

[0069] Phase 1: Primarily involves rinsing the liquid-coating ring trough 7002 and the arc-shaped channel 7004. The operation is as follows: Keep all sealing plates 73 in a semi-extracted state, and then perform the visual recovery processing operation of the second implementation method, such as... Figure 16 As shown, most of the cleaning water flows between the liquid-collecting ring tank 7002 and the arc-shaped channel 7004, thus rinsing both of them.

[0070] Phase Two: After completing Phase One, pause the injection of cleaning water and insert multiple sealing plates 73 into the annular plate 70, as follows: Figure 14 and Figure 15 As shown, the plug 7303 passes through the arc-shaped channel 7004 and is inserted into the slot 7006. The two are fixed together by friction. The end of the plug 7303 away from the slot 7006 is still inside the inner groove 7007, so that the plug 7303 completely blocks the middle of the arc-shaped channel 7004. Liquid cannot flow between adjacent pairs of liquid-aggregating ring grooves 7002 through the arc-shaped channel 7004. In this state, when cleaning water is injected into the corresponding arc-shaped channel 7004 through an infusion tube 71, the cleaning water can only flow to one side of the liquid-aggregating ring groove 7002 (this liquid-aggregating ring groove 7002 is referred to as the first liquid-aggregating ring groove 7002). After reaching the liquid-aggregating ring groove 7002, it enters the arc-shaped channel 7004 on the other side, but it cannot reach the second liquid-aggregating ring groove 7002 through the arc-shaped channel 7004. Therefore, as Figure 17 As shown, after the water reaches the first liquid-aggregating annular tank 7002, the main flow path of the water is as follows:

[0071] Clean water enters between the liquid control plate 8 and the inspection ring 7, and then enters the inspection arc cavities 7005 on both sides through the guide ring groove 7003. After passing through the inspection arc cavities 7005, it reaches the liquid control plate 8 and the inspection ring 7 on the adjacent sides. This path enables the rapid flow of clean water and achieves focused rinsing of the inspection arc cavities 7005. Although the liquid collection ring groove 7002 and the arc channel 7004 are also filled with clean water, the water flow inside them is relatively slow due to the obstruction of the cavity sealing plate 73. Therefore, the arc channel 7004 no longer serves as the main flow path for clean water.

[0072] This embodiment achieves phased rinsing of the inspection ring 7 by setting the sealing plate 73, that is: firstly, the main rinsing of the polymer ring groove 7002 and the arc channel 7004 is achieved, and then the main rinsing of the inspection arc cavity 7005 is achieved, thereby effectively restoring the cleanliness of the inspection arc cavity 7005 and facilitating the recycling of the loose inspection piece.

[0073] The above description is merely a preferred embodiment of the present invention; it encompasses all the protection scope of the present invention. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in the present invention, based on the technical solutions and improved concepts of the present invention, should be covered within the protection scope of the present invention.

Claims

1. An air-cooled island type direct-drive structure for a permanent magnet motor, comprising a permanent magnet motor (1), a shaft (2) of an axial flow fan, and a coupling (3) installed between the two, wherein one end of the coupling (3) is sleeved on the outer end of the output shaft of the permanent magnet motor (1), and the other end of the coupling (3) is threadedly connected to the shaft (2) by a plurality of evenly distributed bolts (4), characterized in that: The outer end of the permanent magnet motor (1) is fixedly fitted with a flow guide (6), and the outer end of the flow guide (6) is fixedly connected to an independent fan (5). The outer end of the coupling (3) is fitted with a loosening check piece, and the loosening check piece is located between the end face of the coupling (3) and the head of the bolt (4). The end face of the permanent magnet motor (1) near the output shaft is fixedly connected to a camera (9). The inspection plate includes an inspection ring (7) and multiple liquid control plates (8) corresponding one-to-one with the bolts (4). The inspection ring (7) includes a ring plate (70). Multiple screw holes (7001) corresponding one-to-one with the bolts (4) are provided on the ring plate (70). The bolts (4) move through the liquid control plates (8) and are threaded into the screw holes (7001), the coupling (3), and the machine shaft (2). Multiple liquid collection rings are provided on the upper end face of the ring plate (70). The ring plate (70) has a groove (7002) and a plurality of flow guiding ring grooves (7003). The plurality of liquid-gathering ring grooves (7002) are located on the outside of a plurality of screw holes (7001), and the plurality of flow guiding ring grooves (7003) are located on the outside of a plurality of liquid-gathering ring grooves (7002). The ring plate (70) has a plurality of arc-shaped channels (7004) inside. The plurality of arc-shaped channels (7004) and the plurality of liquid-gathering ring grooves (7002) are distributed at intervals and are interconnected. The annular plate (70) is further provided with multiple inspection arc cavities (7005), which are located on the upper side of multiple arc channels (7004). The inner bottom surface of the flow guide annular groove (7003) is provided with a connecting hole that communicates with the adjacent inspection arc cavity (7005). The liquid-gathering annular groove (7002) and the arc channel (7004) are both used to fill colored liquid. Multiple transparent strips (72) are fixedly connected to the upper end face of the annular plate (70). The multiple transparent strips (72) are located on the upper side of multiple inspection arc cavities (7005), and the transparent strips (72) are fixedly penetrated through the annular plate (70) and extended to the upper inner wall of the inspection arc cavity (7005).

2. The direct-drive structure of an air-cooled island-type permanent magnet motor according to claim 1, characterized in that: A pair of infusion tubes (71) with valves are fixedly connected to the circumferential surface of the ring plate (70), and the pair of infusion tubes (71) are axially symmetrical about the center line of the ring plate (70). The ends of the infusion tubes (71) are fixedly connected through the ring plate (70) and communicate with the arc-shaped channel (7004).

3. The direct-drive structure of an air-cooled island-type permanent magnet motor according to claim 1, characterized in that: The liquid control plate (8) includes a ring plate (801). An open sealing ring (802) is embedded and fixedly connected to the end face of the ring plate (801) near the inspection ring (7). An inner ring groove (803) is opened on the end face of the ring plate (801) near the inspection ring (7). One end of a waterproof sleeve (804) is fixedly connected to the bottom of the inner ring groove (803), and the other end of the waterproof sleeve (804) is fixedly connected to the upper end face of the ring plate (70).

4. The direct-drive structure of an air-cooled island-type permanent magnet motor according to claim 3, characterized in that: When the bolt (4) passes through the ring (801) and is screwed into the screw hole (7001), and the liquid control plate (8) is tightly fitted with the inspection ring (7), the open sealing ring (802) is fitted to the outside of the groove edge of the liquid-collecting ring groove (7002), and the flow guiding ring groove (7003) is located between the open sealing ring (802) and the inner ring groove (803).

5. The direct-drive structure of an air-cooled island-type permanent magnet motor according to claim 3, characterized in that: A sealing ring (805) is fixedly connected to the inner end of the ring (801), and the sealing ring (805) is made of water-absorbing and expanding material.

6. The direct-drive structure of an air-cooled island-type permanent magnet motor according to claim 3, characterized in that: The waterproof sleeve (804) is made of waterproof flexible material, and the length of the waterproof sleeve (804) is greater than the groove depth of the inner ring groove (803).

7. The direct-drive structure of an air-cooled island-type permanent magnet motor according to claim 1, characterized in that: Multiple sealing plates (73) are slidably connected on the circumferential surface of the ring plate (70). The multiple sealing plates (73) and multiple liquid-gathering ring grooves (7002) are distributed at intervals. One end of the sealing plate (73) is located outside, and the other end extends to the inner side of the arc-shaped channel (7004).

8. The direct-drive structure of an air-cooled island-type permanent magnet motor according to claim 7, characterized in that: The sealing plate (73) includes an end (7301), a thin plate (7302) and a plug (7303), and the thin plate (7302) is fixedly connected between the end (7301) and the plug (7303), and the end (7301) is located outside.

9. The direct-drive structure of an air-cooled island-type permanent magnet motor according to claim 8, characterized in that: An inner groove (7007) is provided on the outer wall of the arc-shaped channel (7004). An outer groove (7008) communicating with the outside is provided on the inner wall of the inner groove (7007) away from the arc-shaped channel (7004). The thin plate (7302) is slidably connected to the inside of the outer groove (7008). The flow guide ring groove (7003) is slidably connected to the inside of the inner groove (7007). The depth of the arc-shaped channel (7004) in the vertical direction is the same as that of the plug (7303). A slot (7006) matching the plug (7303) is provided on the inner wall of the arc-shaped channel (7004).

10. The direct-drive structure of an air-cooled island-type permanent magnet motor according to claim 1, characterized in that: The inner end face of the air guide shroud (6) is provided with an air collection cavity (601), the air outlet of the independent fan (5) is connected to the air collection cavity (601), and the upper inner wall of the air collection cavity (601) is provided with a guide groove (602).

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