Permanent magnet water-cooled motor for chemical shield pump

Abstract

The utility model relates to the technical field of motors, in particular to a permanent magnet water-cooled motor for a chemical shield pump, which comprises a casing main body provided with a mounting hole; the annular bracket is mounted at one end in the mounting hole; the supporting plate is mounted at the other end in the mounting hole; the shielding sleeve is arranged in the mounting hole and located between the annular support and the supporting plate, one end of the shielding sleeve is in sealed connection with the inner wall of the annular support, and the other end of the shielding sleeve is in sealed connection with the outer wall of the supporting plate. The permanent magnet water-cooled motor for the chemical shield pump has the advantages of reliability, compactness and high performance.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a permanent magnet water-cooled motor for use in chemical shielded pumps. Background Technology

[0002] A canned motor pump is a special type of pump consisting of a pump body and a canned motor, as described in Chinese utility model patent application number CN201520508650.7, entitled "Brushless Motor Canned Pump". Because canned motor pumps are commonly used with toxic or harmful gases (liquids) or hazardous gases (liquids), the motor has a series of special structures. Currently, the most common chemical canned motors on the market are based on asynchronous motors, using bearings to fix the rotor. The rotor is directly connected to the pump impeller, and the entire rotor is immersed in the liquid. The shielding sleeve isolates the rotor, bearings, and the motor's interior, preventing liquid from the pump from entering the motor. During overall motor operation, the liquid simultaneously lubricates the bearings and cools the motor. Structurally, the canned motor eliminates the fan blades, making it more compact than an asynchronous motor. Because the motor's energized structure (stator) is isolated by the casing and shielding sleeve, the protective performance of the canned motor is also higher than that of the asynchronous motor.

[0003] The main components of a shielded motor on the market include: motor housing, stator, rotor, end covers, bearings, and shielding sleeve. During the process of converting electrical energy into mechanical energy, energy loss occurs, part of which becomes heat in the stator circuit. Considering the continuous operation of the motor, this heat generation is significant. In extreme cases, it can lead to motor burnout. Therefore, the electromagnetic wires used in shielded motors require special processing to withstand higher temperatures.

[0004] To achieve internal and external isolation, a shielding sleeve is installed inside the motor. Considering the working environment of the canned motor pump (which may contain toxic and hazardous gases), the shielding sleeve is generally made of stainless steel. On the one hand, considering the strength of the shielding sleeve itself, as well as the impact and corrosion of the liquid on the shielding sleeve during pump operation, the thickness cannot be too thin. On the other hand, considering the performance and cost of the motor, an excessively thick shielding sleeve will increase motor losses. Taking all factors into account, the thickness of the shielding sleeve should not be less than 0.3 mm.

[0005] Considering the operating environment of canned motor pumps, the selection of bearings is also special. Under toxic and corrosive conditions, bearings need to be corrosion-resistant, self-lubricating, and have good sealing properties. After comparison, graphite sliding bearings meet these requirements. Compared to ordinary rolling bearings, graphite sliding bearings are resistant to chemical corrosion, high-temperature resistant, and lightweight, making them a commonly used bearing in canned motors.

[0006] Existing shielded motors have the following drawbacks: the electromagnetic wires used in shielded motors have high temperature resistance, requiring special manufacturing processes and resulting in additional costs; the shielding sleeve is relatively thick, making assembly difficult; simultaneously, the shielding sleeve generates eddy currents under the influence of the magnetic field, causing a decline in motor performance; continuous motor operation leads to bearing wear, requiring additional investment in maintenance and upkeep; the pump requires extremely high starting torque. If the corresponding motor torque is insufficient, it will cause the stator to burn out; the motor stator is isolated internally, without thermal circulation, making it difficult for stator heat to be transferred to the casing; the motor is large in size, making it difficult for operators to install in confined spaces; the airtightness of the entire machine is achieved through welding, and the high temperatures and sparks during welding can affect the stator. Utility Model Content

[0007] The technical problem to be solved by this utility model is to provide a reliable, compact, and high-performance permanent magnet water-cooled motor for chemical shielded pumps.

[0008] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a permanent magnet water-cooled motor for a chemical shielded pump, comprising:

[0009] The main body of the casing is equipped with mounting holes;

[0010] A ring-shaped bracket is installed at one end inside the mounting hole;

[0011] The support plate is installed at the other end inside the mounting hole;

[0012] The shielding sleeve is installed inside the mounting hole and located between the annular bracket and the support plate. One end of the shielding sleeve is sealed to the inner wall of the annular bracket, and the other end of the shielding sleeve is sealed to the outer wall of the support plate.

[0013] Furthermore, the inner wall of one end of the mounting hole is provided with a stepped groove, and the annular bracket has a stepped boss that seals with the stepped groove.

[0014] Furthermore, a housing sealing ring is provided between the stepped groove and the stepped boss.

[0015] Furthermore, the other end of the mounting hole is provided with an end cap body, and the support plate is sealed to the end cap body.

[0016] Furthermore, the outer wall of the support plate is provided with an annular groove, and the shielding sleeve is provided with a bent portion that is embedded in the annular groove.

[0017] Furthermore, an end cap sealing ring is provided between the bent portion and the end cap body.

[0018] Furthermore, the shielding sleeve is welded to the annular bracket and the support plate, respectively.

[0019] Furthermore, the thickness of the shielding sleeve ranges from 0.15 mm to 0.25 mm.

[0020] Furthermore, potting compound is filled between the shielding sleeve and the inner wall of the mounting hole.

[0021] Furthermore, it also includes a rotor and a stator, which are located on the inner and outer sides of the shielding sleeve, respectively.

[0022] The beneficial effects of this utility model are as follows: A permanent magnet water-cooled motor for a chemical canned pump is provided by adding annular brackets and support plates to the front and rear of the shielding sleeve, respectively. The shielding sleeve assembly is a cup-shaped structure. By redesigning the assembly structure, the original connection between the shielding sleeve and the housing (the stress section) is changed to use annular brackets and support plates as supports to ensure sealing, strength and stability. This not only reduces the thickness of the shielding sleeve, but also reduces the overall size of the machine. The overall structure is compact, freeing up more space and ensuring reliable performance. Attached Figure Description

[0023] Figure 1 A schematic diagram of the structure of a permanent magnet water-cooled motor used in a chemical shielded pump;

[0024] Figure 2 This is another structural schematic diagram of a permanent magnet water-cooled motor used in chemical canned pumps;

[0025] Figure 3 A cross-sectional view of a permanent magnet water-cooled motor used in a chemical canned pump;

[0026] Figure 4 Another cross-sectional view of a permanent magnet water-cooled motor used in a chemical canned pump;

[0027] Label Explanation:

[0028] 1. Main body of the casing; 11. Mounting hole; 12. Overall sealing ring; 2. Annular bracket; 3. Support plate; 31. Annular groove; 4. Shielding sleeve; 41. Bending part; 411. End cover sealing ring; 5. Casing sealing ring; 6. End cover main body; 7. Potting compound; 8. Rotor; 9. Stator; 10. Stainless steel coil. Detailed Implementation

[0029] To explain in detail the technical content, objectives, and effects of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0030] Please refer to Figures 1 to 4 As shown, this utility model discloses a permanent magnet water-cooled motor for a chemical shielded pump, comprising:

[0031] The main body of the casing 1 is provided with mounting holes 11;

[0032] The ring bracket 2 is installed at one end inside the mounting hole 11;

[0033] Support plate 3 is installed at the other end inside mounting hole 11;

[0034] The shielding sleeve 4 is installed in the mounting hole 11 and located between the annular bracket 2 and the support plate 3. One end of the shielding sleeve 4 is sealed to the inner wall of the annular bracket 2, and the other end of the shielding sleeve 4 is sealed to the outer wall of the support plate 3.

[0035] As can be seen from the above description, the beneficial effects of this utility model are as follows: A permanent magnet water-cooled motor for a chemical canned pump is provided, with annular brackets 2 and support plates 3 added to the front and rear of the shielding sleeve 4, respectively. The shielding sleeve 4 assembly is a cup-shaped structure. By redesigning the assembly structure, the original connection between the shielding sleeve 4 and the housing (stress section) is changed to use the annular brackets 2 and support plates 3 as supports to ensure sealing, strength and stability. This not only reduces the thickness of the shielding sleeve 4, but also reduces the overall size of the machine, making the overall structure compact, freeing up more space, and ensuring reliable performance.

[0036] In an optional embodiment, the inner wall of one end of the mounting hole 11 is provided with a stepped groove, and the annular bracket 2 has a stepped boss that seals with the stepped groove.

[0037] As can be seen from the above description, the annular bracket 2 and the main body of the casing 1 are positioned by steps and form a sealing groove.

[0038] In an optional embodiment, a housing sealing ring 5 is provided between the stepped groove and the stepped boss.

[0039] As can be seen from the above description, the front end is sealed by the housing sealing ring 5, which isolates the stator 9 inside the housing from the outside.

[0040] In an optional embodiment, the other end of the mounting hole 11 is provided with an end cap body 6, and the support plate 3 is sealed to the end cap body 6.

[0041] As can be seen from the above description, the end cap body 6 is statically sealed to the housing body 1 and connected by bolts to ensure the isolation effect at the rear of the housing.

[0042] In an optional embodiment, the outer wall of the support plate 3 is provided with an annular groove 31, and the shielding sleeve 4 is provided with a bent portion 41 that is embedded in the annular groove 31.

[0043] As can be seen from the above description, the assembly positioning efficiency, stability, and sealing performance are improved by the cooperation between the annular groove 31 and the bending part 41.

[0044] In an optional embodiment, an end cap sealing ring 411 is provided between the bent portion 41 and the end cap body 6.

[0045] As can be seen from the above description, the shielding sealing ring corresponds to the groove in the support plate 3 and is compressed by the welded shielding sleeve 4 to ensure the airtightness of the rear end of the shielding sleeve 4.

[0046] In an optional embodiment, the shielding sleeve 4 is welded to the annular bracket 2 and the support plate 3 respectively.

[0047] In an optional embodiment, the thickness of the shielding sleeve 4 ranges from 0.15 mm to 0.25 mm.

[0048] As can be seen from the above description, the thickness of the shielding sleeve 4 can be reduced by using the above-mentioned bracket support structure.

[0049] In an optional embodiment, potting compound 7 is filled between the shielding sleeve 4 and the inner wall of the mounting hole 11.

[0050] As described above, potting compound 7 is filled in the gaps between the housing assembly, stator 9, and shielding sleeve 4, which improves heat transfer efficiency. By filling the original internal cavity with potting compound 7, the heat transfer method is changed from heat convection to heat conduction, which accelerates the heat transfer from the end of stator 9.

[0051] In an optional embodiment, a rotor 8 and a stator 9 are also included, which are located on the inner and outer sides of the shielding sleeve 4, respectively.

[0052] As can be seen from the above description, after the installation of the shielding sleeve 4 assembly, the stator 9 is tightly fitted with the shielding sleeve 4, the stator 9 is completely isolated from the external environment, and the rotor 8 is suspended (after being fitted with the load) in the shielding sleeve 4 without direct contact.

[0053] Please refer to Figures 1 to 4 As shown, Embodiment 1 of this utility model is: a permanent magnet water-cooled motor for a chemical canned pump, which is a cantilever motor, therefore requiring no lubrication or additional maintenance, comprising:

[0054] The main body of the casing 1 is provided with mounting holes 11;

[0055] The annular bracket 2 is installed at one end inside the mounting hole 11 and is statically sealed by the front flange.

[0056] Support plate 3 is installed at the other end inside mounting hole 11;

[0057] The shielding sleeve 4 is set inside the mounting hole 11 and located between the annular bracket 2 and the support plate 3. One end of the shielding sleeve 4 is sealed to the inner wall of the annular bracket 2 and positioned by a stop. The other end of the shielding sleeve 4 is sealed to the outer wall of the support plate 3.

[0058] The ring bracket 2 is an aluminum frame, the support plate 3 is an aluminum plate, and the shielding sleeve 4 is a stainless steel sleeve.

[0059] The inner wall of one end of the mounting hole 11 is provided with a stepped groove, and the annular bracket 2 has a stepped boss that seals with the stepped groove. A housing sealing ring 5 is provided between the stepped groove and the stepped boss. The other end of the mounting hole 11 is provided with an end cover body 6, and the support plate 3 is sealed to the end cover body 6. The outer wall of the support plate 3 is provided with an annular groove 31, and the shielding sleeve 4 is provided with a bent portion 41 that is embedded in the annular groove 31. An end cover sealing ring 411 is provided between the bent portion 41 and the end cover body 6. The shielding sleeve 4 is welded to the annular bracket 2 and the support plate 3 respectively. The thickness of the shielding sleeve 4 ranges from 0.15 mm to 0.25 mm. The space between the shielding sleeve 4 and the inner wall of the mounting hole 11 is filled with potting compound 7. It also includes a rotor 8 and a stator 9, which are located on the inner and outer sides of the shielding sleeve 4 respectively.

[0060] The advantages of this embodiment are: (1) The water-cooled housing is used, which solves the heat dissipation problem of the shielded motor. The motor is designed with a water-cooled housing. During motor operation, the electromagnetic wires in the stator 9 heat up. The electromagnetic wires in the iron core section of the stator 9 are conducted to the housing through heat conduction and carried away by the cooling water; the end section of the stator 9 is conducted to the housing through potting compound 7 and is also carried away by the cooling water. (2) Support frames are added before and after the shielding sleeve 4 and the thickness of the stainless steel sleeve is reduced. By redesigning the assembly process, the original welded seal is changed to an O-ring seal. Therefore, aluminum plate is used as a skeleton support for the connection between the shielding sleeve 4 and the housing (stressed section); stainless steel sleeve is used in the non-stressed section. Finally, the internal gap of the motor is filled with potting compound 7 to make it integrated and increase the strength. (3) A cantilever motor structure is adopted, and the rotor 8 is fixedly connected to the pump shaft, without the need for bearings. The rotor 8 of the cantilever motor is fixedly connected to the pump shaft and positioned by the bearing of the pump shaft. Therefore, no bearings are needed inside the motor. (4) The motor is changed to a permanent magnet rotor 8, which can provide a larger torque. Compared to asynchronous motors, permanent magnet synchronous motors have a higher power density. Under the same volume, permanent magnet motors can provide greater torque. (5) The internal cavity of the motor is filled with potting compound 7, which improves the heat transfer efficiency. The original internal cavity of the motor is filled with potting compound 7, which changes the heat transfer mode from heat convection to heat conduction, thus accelerating the heat transfer from the end of the stator 9. (6) After the bearing is removed, the overall size of the machine is reduced, which can free up more space. The starting torque and power of the permanent magnet motor are greater than those of the asynchronous motor. The reason is that the permanent magnet inside the permanent magnet rotor 8 does not require current excitation and can respond quickly with the change of the magnetic field of the stator 9. (7) The O-ring seal is replaced to eliminate the influence of welding on the stator 9. High temperature, sparks and irritating gases are generated during welding, which will affect the stator 9 of the motor. After the seal is replaced, welding is not required, so there will be no such influence.

[0061] Please refer to Figures 1 to 4 As shown, the second embodiment of this utility model is as follows: a stainless steel coil 10 is pre-embedded inside the main body 1 of the casing. The stainless steel coil 10 forms a water channel inside the casing by spiral winding, and is radially straightened at both ends and exposed outside the main body 1 of the casing.

[0062] Please refer to Figures 1 to 4 As shown, in Embodiment 3 of this utility model, the motor mounting stop is cast integrally with the main body 1 of the housing, thereby ensuring the sealing of the front end of the motor.

[0063] Please refer to Figures 1 to 4 As shown, in Embodiment 4 of this utility model, the sealing ring 12 of the whole machine is compressed in the sealing groove formed by the main body 1 of the housing and the main body 6 of the end cover, so as to ensure the airtightness between the housing and the end cover.

[0064] In summary, this utility model utilizes a water-cooled housing to solve the heat dissipation problem of the shielded motor. Due to the sealing requirements of the shielded motor, it is impossible to use fan blades to blow air for heat dissipation, thus requiring an additional heat dissipation method. Replacing the housing with a water-cooled housing effectively helps dissipate heat from the motor. Considering that the motor is used in a shielded pump, the environment itself contains a large amount of water as a cooling medium. Finally, the internal water-cooling channel of this water-cooled housing is a one-piece molded steel pipe, which has good pressure resistance and corrosion resistance. Support frames are added before and after the shielding sleeve, and the thickness of the stainless steel sleeve is reduced to 0.2mm; aluminum parts are added before and after the shielding sleeve to support the stainless steel shielding sleeve and increase the overall rigidity. At the same time, potting compound is filled in the gap between the shielding sleeve and the stator and housing, making the internal structure of the motor integrated and further increasing the rigidity of the shielding sleeve. A cantilever motor structure is adopted, with the rotor fixedly connected to the pump shaft, eliminating the need for bearings; the cantilever motor directly connects the rotor to the pump shaft, and the rotor has no direct contact with the motor body, thus eliminating the need for bearings. After eliminating the bearings, the overall size of the motor is reduced, the structure is simpler, and the manufacturing and maintenance costs are also reduced. The motor was replaced with a permanent magnet rotor, which provides greater torque. Compared to asynchronous motors, permanent magnet motors offer greater torque and a wider speed range depending on the input frequency. Therefore, permanent magnet motors have a promising future in pump motors. The internal cavity of the motor is filled with potting compound, improving heat transfer efficiency. In shielded motor design, internal heat dissipation is a crucial factor limiting performance. Due to the small contact area between the motor stator and the housing, heat transfer efficiency is low. Filling with potting compound significantly increases the contact area and improves heat dissipation. Eliminating the bearings reduces the overall size of the motor, freeing up more space. The water-cooled housing in this motor increases heat dissipation efficiency, allowing for higher power output in a smaller volume. The O-ring seal eliminates the impact of welding on the stator. Compared to welding, this method facilitates disassembly and maintenance without affecting the overall airtightness of the motor.

[0065] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent modifications made based on the content of this utility model specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A permanent magnet water-cooled motor for use in chemical shielded pumps, characterized in that, include: The main body of the casing is equipped with mounting holes; A ring-shaped bracket is installed at one end inside the mounting hole; The support plate is installed at the other end inside the mounting hole; The shielding sleeve is installed inside the mounting hole and located between the annular bracket and the support plate. One end of the shielding sleeve is sealed to the inner wall of the annular bracket, and the other end of the shielding sleeve is sealed to the outer wall of the support plate.

2. The permanent magnet water-cooled motor for a chemical shielded pump according to claim 1, characterized in that, The inner wall of one end of the mounting hole is provided with a stepped groove, and the annular bracket has a stepped boss that seals with the stepped groove.

3. The permanent magnet water-cooled motor for a chemical shielded pump according to claim 2, characterized in that, A housing sealing ring is provided between the stepped groove and the stepped boss.

4. The permanent magnet water-cooled motor for a chemical shielded pump according to claim 1, characterized in that, The other end of the mounting hole is provided with an end cap body, and the support plate is sealed to the end cap body.

5. The permanent magnet water-cooled motor for a chemical shielded pump according to claim 4, characterized in that, The outer wall of the support plate is provided with an annular groove, and the shielding sleeve is provided with a bent part that is embedded in the annular groove.

6. The permanent magnet water-cooled motor for a chemical shielded pump according to claim 5, characterized in that, An end cap sealing ring is provided between the bent part and the end cap body.

7. The permanent magnet water-cooled motor for a chemical shielded pump according to claim 1, characterized in that, The shielding sleeve is welded to the annular bracket and the support plate, respectively.

8. The permanent magnet water-cooled motor for a chemical shielded pump according to claim 1, characterized in that, The thickness of the shielding sleeve ranges from 0.15 mm to 0.25 mm.

9. The permanent magnet water-cooled motor for a chemical shielded pump according to claim 1, characterized in that, The space between the shielding sleeve and the inner wall of the mounting hole is filled with potting compound.

10. The permanent magnet water-cooled motor for a chemical shielded pump according to claim 1, characterized in that, It also includes a rotor and a stator, which are located on the inner and outer sides of the shielding sleeve, respectively.

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