An explosion-proof motor protection device for submersible mixers

Abstract

This utility model relates to the technical field of explosion-proof motor protection devices, and more particularly to an explosion-proof motor protection device for a submersible mixer. It includes a protective cover, inside which a motor body is housed, and inside the motor body is a drive shaft. An external mounting frame is provided on the outside of the motor body, and the inner side of the mounting frame is fixedly mounted to the outer shell of the motor body via a bracket. The solution achieves all-around sealing protection for the motor body through the tight fit between the cylindrical protective cover and the end cap. The mounting frame and multi-point fixing structure inside the protective cover ensure the stability of the motor during operation. The design of the flange protrusion and fastening bolts makes the connection between the end cap and the protective cover more secure. The application of multi-layer sealing rings and water-swellable rubber material significantly improves waterproof performance, effectively preventing liquid from seeping into the motor. The composite layered structure of the protective cover design combines waterproofing, heat conduction, and insulation functions.

Description

Technical Field

[0001] This utility model relates to the technical field of explosion-proof motor protection devices, and in particular to an explosion-proof motor protection device for a submersible mixer. Background Technology

[0002] Submersible mixers are devices specifically designed for mixing, stirring, and conveying liquids underwater or in liquid environments. They are widely used in industries such as wastewater treatment, chemicals, food processing, and pharmaceuticals. They can operate directly underwater or in liquids and are characterized by high efficiency, energy saving, and ease of operation.

[0003] In wastewater treatment plants, submersible mixers are used to mix sewage and sludge, promote the growth of microorganisms and the decomposition of organic matter, and improve wastewater treatment efficiency. In chemical production processes, submersible mixers are used to mix and transport various chemical liquids, ensuring the uniformity and stability of the reaction. For example, Chinese Patent Publication No. CN205146028U provides a high-efficiency permanent magnet submersible mixer, which includes an impeller, a mechanical seal seat, a mechanical seal, and a submersible motor, specifically a high-efficiency permanent magnet submersible synchronous motor. This invention replaces the ordinary motor in existing submersible mixers with a high-efficiency permanent magnet submersible synchronous motor, resulting in a high power factor, high efficiency, and significant energy savings. Simultaneously, this invention adopts a suitable magnetic pole structure, increasing the air gap magnetic flux density and reducing the motor's size and weight.

[0004] Currently, to ensure long-term safe use, the motor of a submersible mixer needs to be properly sealed during installation. Although the motor itself has a certain degree of waterproofing, it is difficult to guarantee that the sealed parts of the casing will not be corroded and penetrated when submerged in water for a long time. Therefore, additional protection is required to improve its service life and operational safety. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned shortcomings in the existing technology by proposing an explosion-proof motor protection device for submersible mixers.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] Design an explosion-proof motor protection device for a submersible mixer, including a protective cover, the protective cover being a cylindrical structure, a motor body being disposed inside the protective cover, a drive shaft being disposed inside the motor body, and a mounting frame being disposed outside the motor body, the inner side of the mounting frame being fixedly mounted to the outer shell of the motor body by a bracket;

[0008] The surface of the mounting frame is provided with a plurality of mounting holes, and the inner wall of the protective cover is provided with mounting grooves corresponding to the positions of the mounting holes. The mounting holes and mounting grooves corresponding to any position are fixed by fastening bolts and threads.

[0009] The end of the protective cover is covered with an end cap, which, together with the protective cover, covers the motor body. A sealed bearing is embedded and fixed at the center of the end cap, and the surface of the rotating shaft penetrates and is interference-fitted with the inner ring wall of the sealed bearing.

[0010] Preferably, the end cap near the protective cover is provided with a flange protrusion, the flange protrusion and the end cap are integrally formed, and the surface of the flange protrusion is provided with a plurality of flange holes penetrating its interior.

[0011] Preferably, the surface of the protective cover is provided with a flange protrusion II, the flange protrusion II and the protective cover are integral structures, and the surface of the flange protrusion II is provided with a plurality of flange holes II that penetrate through it.

[0012] Preferably, the positions of flange hole one and flange hole two are arranged in a one-to-one correspondence, and a fastening bolt two is provided through the interior of either flange hole one or flange hole two. The other end of the fastening bolt two is threaded with a nut, and one side of the nut is tightly attached to the surface of flange flange one.

[0013] Preferably, the outer ring wall of the protective cover has several annular grooves at its port position, and the interior of the annular grooves is filled with sealing rings. The sealing rings are made of water-swellable rubber material, and the outer ring of the sealing rings is tightly fitted against the inner wall of the protective cover.

[0014] Preferably, a power transmission line is fixedly installed through the tail of the protective cover, and the connection between the power transmission line and the protective cover is filled and bonded with sealant. A terminal block is fixedly installed at the end of the power transmission line.

[0015] Preferably, the protective cover includes a waterproof layer, an outer layer, a thermally conductive insulating layer, and an inner liner. A thermally conductive insulating layer is filled and fixed between the outer layer and the inner liner. The outer wall surface of the outer layer is covered with a waterproof layer. The end caps have the same composition and structure as the protective cover.

[0016] The design scheme proposed in this utility model has the following beneficial effects in application:

[0017] 1. This solution achieves all-round sealing protection for the motor body through the tight fit between the cylindrical protective cover and the end cover. The protective cover is equipped with an installation frame and a multi-point fixing structure to ensure the stability of the motor during operation. The design of the flange protrusion and fastening bolts makes the connection between the end cover and the protective cover more secure. The application of multi-layer sealing rings and water-swellable rubber materials significantly improves the waterproof performance and effectively prevents liquid from seeping into the motor.

[0018] 2. As described in 1, the protective cover design adopts a composite layered structure, which has multiple functions such as waterproofing, heat conduction and insulation. The outer stainless steel material provides high-strength support, the middle heat-conducting insulation layer can quickly dissipate the heat generated by the motor, and the surface heat-conducting epoxy resin waterproof layer further enhances the protective performance. Attached Figure Description

[0019] Figure 1 This is a disassembled schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a schematic diagram showing the connection between the mounting frame and the motor body of this utility model;

[0021] Figure 3 This is a schematic diagram showing the interior of the protective cover and the location of the terminal block of this utility model;

[0022] Figure 4 This is a schematic diagram of the protective cover components of this utility model.

[0023] In the diagram: 1. Protective cover; 11. Motor body; 12. Shaft; 13. Mounting frame; 14. Mounting hole; 15. Fastening bolt one; 16. Mounting groove; 17. End cover; 18. Sealed bearing; 2. Flange protrusion one; 21. Flange hole one; 22. Flange protrusion two; 23. Flange hole two; 24. Fastening bolt two; 25. Nut; 3. Annular groove; 31. Sealing ring; 4. Power transmission line; 41. Terminal block; 101. Waterproof layer; 102. Outer layer; 103. Thermally conductive insulation layer; 104. Inner liner. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0025] Reference Figures 1-4 An explosion-proof motor protection device for a submersible mixer includes a protective cover 1, which is a cylindrical structure. A motor body 11 is installed inside the protective cover 1, and a drive shaft 12 is installed inside the motor body 11. A mounting frame 13 is installed outside the motor body 11. The inner side of the mounting frame 13 is fixedly installed to the outer shell of the motor body 11 by a bracket. The mounting frame 13 can be used to fix the motor body 11 at multiple points when the protective cover 1 is positioned, thereby ensuring the stable installation of the motor body 11 inside the protective cover 1.

[0026] The surface of the mounting frame 13 is provided with a number of mounting holes 14, and the inner wall of the protective cover 1 is provided with mounting grooves 16 corresponding to the positions of the mounting holes 14. The mounting holes 14 and mounting grooves 16 corresponding to any position are assembled and fixed by fastening bolts 15. By connecting the fastening bolts 15 to the corresponding mounting holes 14 and mounting grooves 16, a stable connection between the mounting frame 13 and the protective cover 1 can be achieved.

[0027] The end of the protective cover 1 is covered with an end cap 17. The end cap 17 and the protective cover 1 cover the motor body 11. A sealed bearing 18 is embedded and fixed in the center of the end cap 17. The surface of the rotating shaft 12 passes through and is interference-fitted with the inner ring wall of the sealed bearing 18. The end cap 17 and the protective cover 1 can cover and seal the motor body 11. The sealed bearing 18 can ensure that the rotating shaft 12 passes through the sealed area and can be connected to external components. At the same time, it can also ensure the sealing effect at the connection between the end cap 17 and the rotating shaft 12.

[0028] Among them, the end cap 17 is provided with a flange protrusion 2 near the protective cover 1. The flange protrusion 2 and the end cap 17 are integral structures. The surface of the flange protrusion 2 has several flange holes 21 that penetrate through it. After the end cap 17 and the protective cover 1 are closed and covered, the flange protrusion 2 and the flange protrusion 22 can be tightly attached to each other.

[0029] The protective cover 1 has a flange protrusion 22 on its surface. The flange protrusion 22 and the protective cover 1 are an integral structure. The flange protrusion 22 has several flange holes 23 that penetrate its interior. Both flange holes 21 and flange holes 23 are round holes with smooth inner walls, which facilitates the penetration of fastening bolts 24.

[0030] The flange hole 21 and flange hole 23 are positioned in a one-to-one correspondence. A fastening bolt 24 is installed through the interior of either flange hole 21 or flange hole 23. A nut 25 is threaded onto the other end of the fastening bolt 24. One side of the nut 25 is tightly attached to the surface of the flange flange 2. When it is necessary to close and fix the end cover 17 and the protective cover 1, the end cover 17 and the protective cover 1 can be fixed by fastening bolt 24 passing through the corresponding flange hole 21 and flange hole 23, and by threading the nut 25 with the fastening bolt 24.

[0031] The outer ring wall of the protective cover 1 has several annular grooves 3 at its port. The annular grooves 3 are filled with sealing rings 31. The sealing rings 31 are made of water-swellable rubber material. The outer ring of the sealing rings 31 is tightly fitted against the inner wall of the protective cover 1. By adding multiple layers of sealing rings 31 at the connection between the protective cover 1 and the end cap 17, an auxiliary sealing effect can be achieved, thereby ensuring a stronger sealing effect at the connection between the protective cover 1 and the end cap 17.

[0032] The protective cover 1 has a power transmission line 4 fixedly inserted through its tail. The connection between the power transmission line 4 and the protective cover 1 is filled and bonded with sealant. A terminal block 41 is fixedly installed at the end of the power transmission line 4. The power transmission line 4 is connected to an external power source. The motor body 11 can be energized and fixed by the terminal block 41 through the wire, thereby ensuring a stable power supply to the motor body 11.

[0033] The protective cover 1 includes a waterproof layer 101, an outer layer 102, a thermally conductive insulating layer 103, and an inner liner 104. The thermally conductive insulating layer 103 is filled and fixed between the outer layer 102 and the inner liner 104. The outer wall of the outer layer 102 is covered with the waterproof layer 101. The end cap 17 has the same structure as the protective cover 1. The waterproof layer 101 is made of thermally conductive epoxy resin. By adding thermally conductive fillers such as alumina, aluminum nitride, and silicon carbide to the epoxy resin, the thermal conductivity of the coating can be improved. The outer layer 102 and the inner liner 104 are both made of stainless steel, which has good support strength and facilitates the installation of various components. The thermally conductive insulating layer 103 is made of graphite sheet material, which not only has good thermal conductivity but also has insulation effect.

[0034] Working method: The protective cover 1 of this solution adopts a cylindrical structure design. The internal part is fixedly connected to the motor body 11 through the mounting frame 13. The mounting frame 13 is rigidly connected to the motor housing through the bracket to ensure the stability of the motor inside the protective cover. The mounting holes 14 on the surface of the mounting frame 13 and the mounting groove 16 on the inner wall of the protective cover 1 are locked by fastening bolts 15 to form a multi-point mechanical fixation to prevent the motor from being displaced due to vibration during operation. The end cover 17 covers the port of the protective cover 1 through the mating of flange protrusion 2 and flange protrusion 22. The two are pressed and sealed by fastening bolts 24 and nuts 25 through flange holes 21 and 23. The sealing bearing 18 is embedded in the center of the end cover 17 and is interference-fitted with the rotating shaft 12 to prevent external liquid from entering. The water-swellable rubber sealing ring 31 filled in the annular groove 3 at the port of the protective cover 1 expands after contact with water, further enhancing the sealing performance at the connection between the end cover and the protective cover.

[0035] The protective cover 1 adopts a multi-layer composite structure. The outer layer 102 and the inner liner 104 are made of stainless steel, providing mechanical support while isolating external corrosive media. The thermally conductive insulating layer 103 between them is made of graphite sheet material, which can quickly conduct the heat generated by the motor during operation to the outer layer while maintaining electrical insulation properties. The waterproof layer 101 covers the surface of the outer layer 102 and is made of thermally conductive epoxy resin with fillers such as alumina or aluminum nitride, which has both waterproof and auxiliary heat dissipation functions. The power transmission line 4 is bonded and fixed to the tail of the protective cover 1 with sealant, and its end terminal 41 is connected to the motor wire to ensure the sealing of the power supply line. The heat of the motor is transferred through the inner liner 104 to the thermally conductive insulating layer 103, and then dissipated to the external environment through the outer layer 102 and the waterproof layer 101, forming an efficient thermal management path to avoid the risk of motor explosion due to overheating.

[0036] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An explosion-proof motor guard for submersible mixers, comprising a guard shield (1), characterised in that: The protective cover (1) is a cylindrical structure. The motor body (11) is provided inside the protective cover (1). The rotating shaft (12) for driving is provided inside the motor body (11). The mounting frame (13) is provided outside the motor body (11). The inner side of the mounting frame (13) is fixedly installed to the outer shell of the motor body (11) by a bracket. The surface of the mounting frame (13) is provided with a plurality of mounting holes (14), and the inner wall of the protective cover (1) is provided with mounting grooves (16) corresponding to the positions of the mounting holes (14). The mounting holes (14) and mounting grooves (16) corresponding to any position are fixed by fastening bolts (15) threaded assembly. The end of the protective cover (1) is covered with an end cap (17), which, together with the protective cover (1), covers the motor body (11). A sealed bearing (18) is embedded and fixed in the center of the end cap (17), and the surface of the rotating shaft (12) penetrates and is interference-fitted with the inner ring wall of the sealed bearing (18).

2. The explosion-proof motor protection device for a submersible mixer according to claim 1, characterized in that: The end cap (17) near the protective cover (1) is provided with a flange protrusion (2). The flange protrusion (2) and the end cap (17) are an integral structure. The surface of the flange protrusion (2) is provided with several flange holes (21) that penetrate its interior.

3. The explosion-proof motor protection device for a submersible mixer according to claim 2, characterized in that: The protective cover (1) has a flange protrusion (22) on its surface. The flange protrusion (22) and the protective cover (1) are an integral structure. The flange protrusion (22) has several flange holes (23) that penetrate its interior.

4. The explosion-proof motor protection device for a submersible mixer according to claim 3, characterized in that: The flange hole one (21) and flange hole two (23) are positioned in a one-to-one correspondence. A fastening bolt two (24) is installed through the interior of any flange hole one (21) and flange hole two (23). A nut (25) is threaded on the other end of the fastening bolt two (24). One side of the nut (25) is tightly attached to the surface of the flange protrusion one (2).

5. The explosion-proof motor protection device for a submersible mixer according to claim 1, characterized in that: The outer ring wall of the protective cover (1) has several annular grooves (3) at the port position. The annular grooves (3) are filled with sealing rings (31). The sealing rings (31) are made of water-swellable rubber material. The outer ring of the sealing rings (31) is tightly fitted against the inner wall of the protective cover (1).

6. The explosion-proof motor protection device for a submersible mixer according to claim 1, characterized in that: The tail of the protective cover (1) is fixed with a power transmission line (4), and the connection between the power transmission line (4) and the protective cover (1) is filled and bonded with sealant. The end of the power transmission line (4) is fixedly installed with a terminal block (41).

7. The explosion-proof motor protection device for a submersible mixer according to claim 1, characterized in that: The protective cover (1) includes a waterproof layer (101), an outer layer (102), a thermally conductive insulating layer (103), and an inner liner (104). The thermally conductive insulating layer (103) is filled and fixed between the outer layer (102) and the inner liner (104). The outer wall surface of the outer layer (102) is covered with a waterproof layer (101). The end cap (17) has the same composition and structure as the protective cover (1).

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