An intelligent three-phase asynchronous explosion-proof motor

Abstract

The present invention relates to the field of motor technology, and discloses an intelligent three-phase asynchronous explosion-proof motor, comprising a body, a junction box arranged on the top of the body, an external connector arranged on the outside of the junction box, a power cord arranged in the junction box and the external connector, and a sealing assembly arranged in the external connector, wherein the sealing assembly specifically comprises a middle seal capable of filling the gap between the external connector and the power cord. The intelligent three-phase asynchronous explosion-proof motor is configured by filling a hollow air cushion with viscous oil. When a gap appears between the hollow air cushion and the power cord, the viscous oil in the hollow air cushion will penetrate into the gap to form an oil seal, thereby preventing dust from entering the junction box through the gap and forming a layer of oil stain at the gap, thereby providing a more stable sealing effect on the gap. When the gap appears again, the oil can penetrate and fill it again, thereby enabling the device to maintain effective sealing for a long time, thereby ensuring the safety of the device.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to an intelligent three-phase asynchronous explosion-proof motor. Background Art

[0002] Explosion-proof motors are motors that can be used in flammable and explosive places. They do not generate electric sparks during operation and are mainly used in coal mines, oil and gas, petrochemical and chemical industries. They are also widely used in textiles, metallurgy, city gas and other departments. According to the use environment: for example, in underground coal mines, flameproof explosion-proof motors are generally selected; in flour mills, feed processing plants and other places where there is a risk of dust explosion, dust explosion-proof motors should be selected.

[0003] Patent publication number CN115189503A discloses an explosion-proof three-phase asynchronous motor, which belongs to the technical field of three-phase asynchronous motors and includes a three-phase asynchronous motor body. A constant pressure component is fixedly installed at the bottom of the three-phase asynchronous motor body. The constant pressure component includes a shock absorber, a buffer tank, and a pressure accumulator. In the above scheme, the buffer tank will continuously provide the three-phase asynchronous motor body with air that does not contain flammable and explosive substances during operation. When the air inside the three-phase asynchronous motor body is discharged, it will take away the heat inside the body, thereby providing a heat dissipation function for the three-phase asynchronous motor body. Before starting the three-phase asynchronous motor body, the staff opens the valve on the second air supply pipe, and the air that does not contain flammable and explosive substances in the pressure accumulator will quickly flow into the interior of the three-phase asynchronous motor body, thereby being able to discharge the air inside the three-phase asynchronous motor body, effectively ensuring that the three-phase asynchronous motor body has good stability during startup and the entire operation stage.

[0004] The existing technology has the following defects:

[0005] Explosion-proof motors require power when in use. The power cord is connected from the outside of the junction box. A seal is set inside the access port of the junction box to achieve sealing of the junction box. However, since the explosion-proof motor will vibrate continuously during operation and the power cord is mostly not fixed, this may cause a gap to appear between the seal and the power cord. The temperature will also change when the equipment is in use and turned off. In this way, the seal is constantly affected by thermal expansion and contraction, and is prone to deformation, causing a gap to appear between the seal and the power cord. After the explosion-proof motor is used for a long time, external dust can easily enter the junction box, affecting the equipment, or the arc in the junction box can ignite the dust in the air, causing an explosion accident. Summary of the Invention

[0006] In view of the problem of poor sealing effect in the existing technology, an intelligent three-phase asynchronous explosion-proof motor is proposed.

[0007] The present application provides an intelligent three-phase asynchronous explosion-proof motor, the purpose of which is to enable the equipment to maintain effective sealing for a long time.

[0008] The technical solution of the present invention is: an intelligent three-phase asynchronous explosion-proof motor, comprising a body, a junction box arranged on the top of the body, an external connector arranged outside the junction box, a power cord arranged in the junction box and the external connector, and a sealing assembly arranged in the external connector, the sealing assembly specifically comprising a middle seal capable of filling a gap between the external connector and the power cord;

[0009] The middle sealing member comprises an outer sleeve and a hollow air cushion arranged inside the movable tube. The outer sleeve is arranged on the outside of the hollow air cushion, and the hollow air cushion is arranged on the outside of the power cord. The interior of the hollow air cushion is filled with viscous oil.

[0010] Furthermore, the external joint specifically includes a fixed tube arranged outside the junction box, a movable tube arranged at one end of the fixed tube away from the junction box, and a fixing bolt arranged between the fixed tube and the movable tube.

[0011] Furthermore, the diameter of the opening at the connection between the fixed tube and the junction box is the same as the inner diameter of the movable tube.

[0012] Furthermore, the sealing assembly also includes an outer seal inserted into the movable tube, the outer seal is wrapped around the outside of the power cord, the cross-section of the outer seal is convex, and the edge portion overlaps the opening of the outer seal.

[0013] Furthermore, the middle seal also includes an annular groove opened at one end of the fixed tube close to the movable tube, the cross section of the outer sleeve is "convex" shaped, and the protruding part is inserted into the annular groove, and the edge overlaps the opening of the annular groove.

[0014] Furthermore, the interior of the hollow air cushion is provided with an annular compartment partition, and two surrounding partitions are provided between the compartment partition and the inner ring wall of the hollow air cushion;

[0015] The surrounding partition is annular, and the inner surface of the surrounding partition is connected to the inner wall of the hollow air cushion, and the outer surface of the surrounding partition is connected to the chamber partition. The surrounding partition, the chamber partition and the inner wall of the hollow air cushion form a precise penetration cavity, and the two surrounding partitions circle an outer penetration layer on the inner side of the hollow air cushion.

[0016] Furthermore, two liquid storage partitions are provided between the compartment partition and the outer ring wall of the hollow air cushion;

[0017] One side of the liquid storage barrier is connected to the chamber barrier, and the other three sides are connected to the hollow air cushion. The two liquid storage barrier layers are symmetrically distributed based on the axial vertical section of the hollow air cushion, and the liquid storage barrier layer is located above the central axis of the hollow air cushion. The outer annular wall of the liquid storage barrier layer, the chamber barrier layer and the hollow air cushion constitute an oil storage cavity, and the liquid storage barrier layer circles an inner permeable layer outside the chamber barrier layer.

[0018] Furthermore, the permeability of the outer permeation layer gradually decreases from top to bottom along the circumferential direction.

[0019] Furthermore, the sealing assembly further comprises an inner sealing member disposed inside the fixed tube, and the inner sealing member specifically comprises an insert ring, a sleeve ring and a soft membrane disposed inside the fixed tube;

[0020] The insert ring and the sleeve ring are clamped, one end of the soft film is clamped by the insert ring and the sleeve ring, and the other end passes through the inner side of the sleeve ring into the junction box, and the outer sides of the soft film and the power line are both wrapped with tape.

[0021] Furthermore, a support ring is provided at one end of the soft membrane away from the inserting ring.

[0022] Beneficial effects of the present invention:

[0023] 1. By filling the hollow air cushion with viscous oil, when a gap appears between the hollow air cushion and the power cord, the viscous oil in the hollow air cushion will penetrate into the gap to form an oil seal, preventing dust from entering the junction box through the gap. The dust is adsorbed by the oil and a layer of oil stain will form at the gap, which will have a more stable sealing effect on the gap. When the gap appears again due to vibration or other reasons, the oil can penetrate and fill it again, so that the equipment can maintain effective sealing for a long time, ensuring the safe use of the equipment.

[0024] 2. By dividing the external joint into two sections, the fixed pipe and the fixed pipe, the installation of the sealing component is facilitated. At the same time, the internal space of the fixed pipe is larger, providing space for dust deposition, preventing accidental dust from flowing directly into the junction box.

[0025] 3. By setting up an outer permeation layer, the oil is allowed to seep out in a specific area to avoid large-scale oil leakage, causing serious pollution, and avoiding excessive oil consumption, thereby extending the validity period of accessories. The area of the outer permeation layer is limited, and a leakage mitigation zone is reserved at both ends of the outer permeation layer to prevent the oil from flowing to areas outside the hollow air cushion. At the same time, the permeability of the outer permeation layer decreases as it goes downward, and the oil that penetrates from the top will flow downward, thus further controlling the direction of oil leakage and retaining more oil in the outer permeation layer area. This ensures stable oil penetration and reduces the pollution area.

[0026] 4. By setting up a liquid storage barrier, the oil is stored in the upper area of the compartment barrier, so that the oil can better penetrate into the precise penetration cavity, so that the precise penetration cavity can remain overflowing for a long time, and the oil penetrating from the outer penetration layer is more uniform.

[0027] 5. By setting up an inner seal, a soft film is used to seal between the plug ring and the power cord. Since the soft film is relatively soft, the vibration of the equipment has little effect on the soft film, so that it can maintain the sealing effect for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a three-dimensional diagram of the intelligent three-phase asynchronous explosion-proof motor of the present invention;

[0029] Figure 2 This is a schematic diagram of the external connector of the present invention;

[0030] Figure 3 This is a schematic diagram of the outer seal of the present invention;

[0031] Figure 4 Schematic diagram of the sealing member and inner sealing member in the present invention;

[0032] Figure 5 Schematic diagram of the sealing member in the present invention;

[0033] Figure 6 Schematic diagram of the hollow air cushion of the present invention;

[0034] Figure 7 This is a schematic diagram of the interior of the hollow air cushion of the present invention;

[0035] Figure 8 Schematic diagram of the outer permeation layer and the inner permeation layer of the present invention;

[0036] Figure 9 This is a schematic diagram of the inner seal of the present invention;

[0037] Figure 10 This is a disassembled diagram of the inner seal of the present invention;

[0038] Figure 11 A top view of the present invention;

[0039] Figure 12 For the present invention Figure 11 Cross-sectional view at AA in the middle;

[0040] Figure 13 For the present invention Figure 12 Enlarged view of the middle and outer joints and sealing components;

[0041] Figure 14 For the present invention Figure 13 Enlarged view of point B in the middle.

[0042] In the picture:

[0043] 1. Body; 2. Junction box; 3. External connector; 31. Fixed tube; 32. Movable tube; 33. Fixing bolt; 4. Sealing assembly; 41. Outer seal; 42. Middle seal; 421. Ring groove; 422. Outer jacket; 423. Hollow air cushion; 424. Chamber partition; 425. Surrounding partition; 426. Liquid storage partition; 427. Outer permeable layer; 428. Inner permeable layer; 43. Inner seal; 431. Insert ring; 432. Sleeve ring; 433. Soft film; 5. Power cord. DETAILED DESCRIPTION

[0044] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0045] Example 1, with reference to Figures 1-14 , which is the first embodiment of the present invention, provides an intelligent three-phase asynchronous explosion-proof motor, including a body 1, a junction box 2 arranged on the top of the body 1, an external connector 3 arranged outside the junction box 2, a power cord 5 arranged in the junction box 2 and the external connector 3, and also includes a sealing component 4 arranged in the external connector 3. The sealing component 4 specifically includes a middle seal 42 that can fill the gap between the external connector 3 and the power cord 5.

[0046] Specifically, the junction box 2 is welded to the top of the fuselage 1, a terminal is provided inside the junction box 2, a sealing cover is installed on the top, the external joint 3 is welded to the junction box 2, and the middle seal 42 includes an outer sleeve 422 and a hollow air cushion 423 provided inside the movable tube 32. The outer sleeve 422 is sleeved on the outside of the hollow air cushion 423, and the two are adhered by glue. The hollow air cushion 423 is sleeved on the outside of the power cord 5, and the two are tightly fitted. The interior of the hollow air cushion 423 is filled with viscous oil, and the viscous oil can continuously seep out through the hollow air cushion 423.

[0047] By filling the hollow air cushion 423 with viscous oil, when a gap appears between the hollow air cushion 423 and the power cord 5, the viscous oil in the hollow air cushion 423 will penetrate into the gap to form an oil seal, preventing dust from entering the junction box 2 through the gap. The dust is adsorbed by the oil and a layer of oil stain is formed at the gap, which has a more stable sealing effect on the gap. When the gap appears again due to vibration or other reasons, the oil can penetrate and fill it again, so that the equipment can maintain effective sealing for a long time, ensuring the safety of the equipment.

[0048] The external connector 3 specifically includes a fixed tube 31 disposed outside the junction box 2 , a movable tube 32 disposed at one end of the fixed tube 31 away from the junction box 2 , and a fixing bolt 33 disposed between the fixed tube 31 and the movable tube 32 .

[0049] Specifically, the movable tube 32 is fixed in the fixed tube 31 by threads, and ear plates are fixedly provided on the outside of the fixed tube 31 and the movable tube 32. The fixing bolts 33 pass through the ear plates on the outside of the fixed tube 31 and the movable tube 32 to prevent the movable tube 32 from rotating in the fixed tube 31. The movable tube 32 is not fully inserted into the fixed tube 31, leaving half of the space in the fixed tube 31. The opening diameter at the connection between the fixed tube 31 and the junction box 2 is the same as the inner diameter of the movable tube 32.

[0050] By dividing the external connector 3 into two sections, the fixed tube 31 and the fixed tube 31, the installation of the sealing assembly 4 is facilitated. At the same time, the internal space of the fixed tube 31 is larger, providing space for dust deposition, thereby preventing accidentally entering dust from directly flowing into the junction box 2.

[0051] Specifically, the sealing assembly 4 also includes an outer seal 41 inserted into the inside of the movable tube 32. The outer seal 41 is wrapped around the outside of the power cord 5. The outer seal 41 is made of rubber. The cross-section of the outer seal 41 is "convex" shaped, and the edge portion overlaps the opening of the outer seal 41, thus playing a basic sealing role. The outward-turned portion of one end of the outer seal 41 fits with the movable tube 32, making the seal between the two better.

[0052] Specifically, the middle seal 42 also includes an annular groove 421 opened at one end of the fixed tube 31 near the movable tube 32. The outer sleeve 422 is made of hard rubber. The cross-section of the outer sleeve 422 is "convex" shaped, and the protruding part is inserted into the annular groove 421, and the edge overlaps the opening of the annular groove 421. This makes the seal between the outer sleeve 422 and the movable tube 32 better, and cooperates with the outer seal 41 to prevent dust from flowing into the gap between the movable tube 32 and the outer seal 41 and the outer sleeve 422.

[0053] An annular compartment partition 424 is provided inside the hollow air cushion 423 , and two surrounding partitions 425 are provided between the compartment partition 424 and the inner ring wall of the hollow air cushion 423 .

[0054] Specifically, the surrounding partition 425 is annular, and the inner annular surface of the surrounding partition 425 is connected to the inner annular wall of the hollow air cushion 423, and the outer annular surface of the surrounding partition 425 is connected to the chamber partition 424, and the connection method is glue fixing. The surrounding partition 425, the chamber partition 424 and the inner annular wall of the hollow air cushion 423 form a precise penetration cavity. The two surrounding partitions 425 circle the outer penetration layer 427 on the inner side of the hollow air cushion 423. The outer penetration layer 427 is centrally arranged, and the length of the outer penetration layer 427 is one third of the length of the hollow air cushion 423. The surrounding partition 425 divides the internal space of the hollow air cushion 423 into two inner and outer intervals, and the volume of the outer interval is more than seven times the volume of the inner interval; the permeability of the outer penetration layer 427 gradually decreases from top to bottom along the circumferential direction, and the permeability decreases by 10% for every 30° downward deflection along the circumferential direction.

[0055] By providing an outer permeation layer 427, the oil is allowed to seep out in a specific area, thereby preventing the oil from escaping over a large area and causing serious pollution, as well as preventing the oil from being consumed too quickly and extending the shelf life of the accessories. The area of the outer permeation layer 427 is limited, and a diffusion mitigation zone is reserved at both ends of the outer permeation layer 427 to prevent the oil from flowing to areas outside the hollow air cushion 423. At the same time, the permeability of the outer permeation layer 427 decreases as it moves downward, and the oil that seeps out from above will flow downward, thereby further controlling the direction of oil diffusion and retaining more oil in the outer permeation layer 427 area, thereby ensuring stable penetration of the oil and reducing the pollution area.

[0056] Two liquid storage partitions 426 are provided between the compartment partition 424 and the outer annular wall of the hollow air cushion 423 .

[0057] Specifically, one side of the liquid storage partition 426 is connected to the chamber partition 424, and the other three sides are connected to the hollow air cushion 423, and the connection method is glue fixing. The two liquid storage partitions 426 are symmetrically distributed based on the axial vertical section of the hollow air cushion 423, and the liquid storage partition 426 is located above the central axis of the hollow air cushion 423. The axial vertical section is a section perpendicular to the ground made through the central axis of the hollow air cushion 423. The outer annular wall of the liquid storage partition 426, the chamber partition 424 and the hollow air cushion 423 constitutes an oil storage cavity. The liquid storage partition 426 circles an inner permeable layer 428 on the outside of the chamber partition 424. The inner permeable layer 428 is located directly above the chamber partition 424, corresponding to the position of the precise permeable cavity. An oil filling valve connected to the oil storage cavity is installed on the outside of the hollow air cushion 423. The volume of the oil storage cavity is more than three times the volume of the inner interval of the chamber partition 424.

[0058] By providing a liquid storage barrier 426, the oil is stored in the upper area of the chamber barrier 424, so that the oil can better penetrate into the precise penetration cavity, so that the precise penetration cavity can remain overflowing for a long time, and the oil that penetrates out of the outer penetration layer 427 is more uniform.

[0059] The intelligent settings of explosion-proof motors include the following:

[0060] Variable frequency speed control: The motor speed is adjusted in real time through the frequency converter to dynamically match the output power with the load demand, avoiding the energy waste of traditional constant speed operation.

[0061] Adaptive load tracking: Built-in intelligent algorithm monitors motor current, temperature and other parameters in real time to dynamically optimize operating mode.

[0062] Efficient cooling system optimization: Intelligent temperature-controlled fans or oil pumps automatically adjust cooling intensity according to motor temperature rise, reducing energy consumption of auxiliary equipment.

[0063] There are three types of viscous oils:

[0064] The first type can be grease, such as lithium-based grease, which has high viscosity and can effectively adhere to dust to form a sealing layer. At the same time, grease is usually not easy to leak and is suitable for static sealing.

[0065] Example: High temperature lithium complex grease.

[0066] Applicable scenarios: Industrial sites with high dust concentration and large ambient temperature fluctuations (-20℃~150℃).

[0067] The second type can be silicone oil, especially high-viscosity silicone oil. Silicone oil has good chemical stability, strong antioxidant properties, is not easy to volatilize, and is suitable for long-term use. In addition, silicone oil has good compatibility with a variety of materials, reducing the risk of corrosion.

[0068] Example: high viscosity methyl silicone oil (above 10000 cSt).

[0069] Applicable scenarios: precision explosion-proof motors (such as chemical, oil and gas industries).

[0070] A third option might be synthetic lubricants, such as polyalphaolefins (PAO). PAO offers excellent high- and low-temperature performance, a high viscosity index, and the ability to maintain stable performance over a wide temperature range. Furthermore, PAO's resistance to oxidation and degradation is strong, making it suitable for harsh environments.

[0071] Example: synthetic hydrocarbon sealing oil (PAO base oil).

[0072] Applicable scenarios: explosion-proof motors for outdoor or mobile equipment (such as mining machinery).

[0073] Example 2, reference Figures 1-14, which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that the sealing assembly 4 also includes an inner seal 43 arranged inside the fixed tube 31, and the inner seal 43 specifically includes an insert ring 431, a sleeve ring 432 and a soft film 433 arranged inside the fixed tube 31.

[0074] Specifically, the cross-section of the plug ring 431 is convex, and the cross-section of the sleeve ring 432 is concave. The plug ring 431 and the sleeve ring 432 are clamped together. The plug ring 431, the sleeve ring 432 and the soft film 433 are all sleeved on the outside of the power cord 5, and a five-millimeter gap is left between the sleeve ring 432 and the power cord 5. The outer contours of the plug ring 431 and the sleeve ring 432 fit the inner wall of the fixed tube 31. One end of the soft film 433 is clamped by the plug ring 431 and the sleeve ring 432, and the other end is axially passed through the junction box 2 from the inner side of the sleeve ring 432 along the outer surface of the power cord 5. Tape is wrapped around the outside of the soft film 433 and the power cord 5; a support ring is provided at the end of the soft film 433 away from the plug ring 431.

[0075] By setting the inner seal 43, the soft film 433 is used to seal the plug ring 431 and the power cord 5. Since the soft film 433 is relatively soft, the vibration of the equipment has little effect on the soft film 433, so that the sealing effect can be maintained for a long time.

[0076] The inner seal 43 is an optional accessory. In actual use, whether the inner seal 43 needs to be installed is determined based on site conditions and sealing requirements.

[0077] The remaining structures are the same as those of Example 1.

[0078] Based on Examples 1 and 2, the working principle of an intelligent three-phase asynchronous explosion-proof motor of the present invention is as follows:

[0079] During installation, first put the end of the soft film 433 without the support ring on the stepped surface of the protruding part of the plug-in ring 431, then put the ring 432 on the protruding part of the plug-in ring 431, clamp the soft film 433, and then pull the end of the soft film 433 with the support ring through the inside of the ring 432; insert the inner seal 43 into the fixed tube 31, and then pull the end of the soft film 433 with the support ring into the junction box 2.

[0080] First, apply hot melt glue on the outside of the hollow air cushion 423, and then insert the hollow air cushion 423 into the outer sleeve 422, keeping the oil filling valve always facing upward during this process; insert the outer sleeve 422 into the annular groove 421 and fix it with bolts, then insert the outer seal 41 into the movable tube 32 from the other end, and then insert the movable tube 32 into the fixed tube 31, and finally use the fixing bolt 33 to penetrate the ear plate connecting the fixed tube 31 and the outer side of the movable tube 32, keeping the oil filling valve always facing upward during this process.

[0081] The power cord 5 is passed from the outside of the movable tube 32 through the outer seal 41, the hollow air cushion 423 and the soft film 433 into the junction box 2. At this time, the soft film 433 is sleeved on the outside of the power cord 5. Use tape to wrap around the surface of the soft film 433 and continuously move toward the center of the junction box 2 until it passes through the support ring and is wrapped around the surface of the power cord 5. Then, it is wrapped around the back side to the starting point. Each circle of tape maintains one-third overlap. The distance between the starting point of the tape wrapping and the support ring is four centimeters, and the distance between the end point of the tape wrapping and the support ring is three centimeters.

[0082] When in use, the body 1 is placed in an environment with high dust concentration. The outer seal 41, the middle seal 42 and the inner seal 43 all have a sealing function, which can prevent external dust from entering the junction box 2. During this process, the oil in the precise penetration cavity penetrates a small amount through the outer penetration layer 427 to the surface of the power cord 5, and the oil in the oil storage cavity penetrates into the precise penetration cavity through the inner penetration layer 428 for replenishment.

[0083] After the equipment has been used for a period of time, the outer seal 41 and the hollow air cushion 423 will be worn and deformed due to vibration, friction, thermal expansion and contraction, and the sealing effect will decrease. Dust will flow into the gap between the outer seal 41 and the power cord 5, and the oil in the precise penetration cavity will penetrate through the outer penetration layer 427 again to fill the gap between the hollow air cushion 423 and the power cord 5. The viscosity of the oil will form an oil film to isolate the dust, and as the dust is integrated, a layer of solid oil stain will gradually form, which will enhance the sealing effect and make it more stable. When a gap appears here again, more oil will penetrate out to form new oil stain to fill it.

[0084] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. An intelligent three-phase asynchronous explosion-proof motor, comprising a body (1), a junction box (2) arranged on the top of the body (1), an external connector (3) arranged outside the junction box (2), and a power line (5) arranged inside the junction box (2) and the external connector (3), characterized in that: It also includes a sealing assembly (4) disposed in the external connector (3), wherein the sealing assembly (4) specifically includes a middle sealing member (42) capable of filling a gap between the external connector (3) and the power line (5); The middle sealing member (42) includes an outer sleeve (422) and a hollow air cushion (423) arranged inside the movable tube (32), the outer sleeve (422) is sleeved on the outside of the hollow air cushion (423), the hollow air cushion (423) is sleeved on the outside of the power cord (5), and the interior of the hollow air cushion (423) is filled with viscous oil; An annular compartment partition (424) is provided inside the hollow air cushion (423), and two surrounding partitions (425) are provided between the compartment partition (424) and the inner annular wall of the hollow air cushion (423); The surrounding partition layer (425) is annular, and the inner annular surface of the surrounding partition layer (425) is connected to the inner annular wall of the hollow air cushion (423), and the outer annular surface of the surrounding partition layer (425) is connected to the chamber partition layer (424). The surrounding partition layer (425), the chamber partition layer (424) and the inner annular wall of the hollow air cushion (423) form a precise permeation cavity. The two surrounding partition layers (425) are arranged on the inner side of the hollow air cushion (423) to form an outer permeation layer (427); Two liquid storage partitions (426) are provided between the compartment partition (424) and the outer annular wall of the hollow air cushion (423); One side of the liquid storage barrier (426) is connected to the chamber barrier (424), and the other three sides are connected to the hollow air cushion (423). The two liquid storage barrier layers (426) are symmetrically distributed based on the axial vertical section of the hollow air cushion (423), and the liquid storage barrier layer (426) is located above the central axis of the hollow air cushion (423). The outer annular wall of the liquid storage barrier layer (426), the chamber barrier layer (424) and the hollow air cushion (423) forms an oil storage cavity. The liquid storage barrier layer (426) draws an inner permeable layer (428) on the outer side of the chamber barrier layer (424).

2. The intelligent three-phase asynchronous explosion-proof motor according to claim 1 is characterized in that: The external joint (3) specifically comprises a fixed tube (31) arranged outside the junction box (2), a movable tube (32) arranged at one end of the fixed tube (31) away from the junction box (2), and a fixing bolt (33) arranged between the fixed tube (31) and the movable tube (32).

3. The intelligent three-phase asynchronous explosion-proof motor according to claim 2 is characterized in that: The diameter of the opening at the connection between the fixed tube (31) and the junction box (2) is the same as the inner diameter of the movable tube (32).

4. The intelligent three-phase asynchronous explosion-proof motor according to claim 2 is characterized in that: The sealing assembly (4) further includes an outer sealing member (41) inserted into the interior of the movable tube (32), the outer sealing member (41) being wrapped around the outside of the power cord (5), the cross section of the outer sealing member (41) being in a "convex" shape, and the edge portion being overlapped at the opening of the outer sealing member (41).

5. The intelligent three-phase asynchronous explosion-proof motor according to claim 2 is characterized in that: The middle sealing member (42) further comprises an annular groove (421) formed at one end of the fixed tube (31) close to the movable tube (32). The cross section of the outer sleeve (422) is convex, and the protruding portion is inserted into the annular groove (421), with the edge overlapping the opening of the annular groove (421).

6. The intelligent three-phase asynchronous explosion-proof motor according to claim 1 is characterized in that: The permeability of the outer permeable layer (427) gradually decreases from top to bottom along the circumferential direction.

7. The intelligent three-phase asynchronous explosion-proof motor according to claim 2 is characterized in that: The sealing assembly (4) further includes an inner sealing member (43) disposed inside the fixed tube (31), wherein the inner sealing member (43) specifically includes an insert ring (431), a sleeve ring (432), and a soft membrane (433) disposed inside the fixed tube (31); The insert ring (431) and the sleeve ring (432) are clamped together, one end of the soft film (433) is clamped by the insert ring (431) and the sleeve ring (432), and the other end penetrates from the inside of the sleeve ring (432) into the junction box (2), and the outside of the soft film (433) and the power cord (5) are both wrapped with adhesive tape.

8. The intelligent three-phase asynchronous explosion-proof motor according to claim 7, characterized in that: A support ring is provided at one end of the soft membrane (433) away from the inserting ring (431).

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