Low-temperature-resistant explosion-proof three-phase asynchronous motor
By using heating elements, stainless steel shaft keys, low-temperature grease, and specific seals in the motor, the mechanical strength and sealing problems of the motor in low-temperature environments were solved, enabling the motor to start and run normally at low temperatures.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NANYANG FANGBAO GRP TONGAN FOUNDRY CO LTD
- Filing Date
- 2025-04-29
- Publication Date
- 2026-04-21
AI Technical Summary
Existing motors are prone to low-temperature brittleness in low-temperature environments, resulting in loss of elasticity of seals and increased viscosity of lubricants. This leads to reduced mechanical strength, starting failure, or accelerated wear. Furthermore, the lack of a heating device increases the risk of electrical breakdown.
The stator winding is heated by a heating belt, and stainless steel shaft keys and low-temperature grease are used. Silicone rubber or low-temperature fluororubber seals are used, the shaft is made of low-carbon nickel steel and the fan is made of cast aluminum alloy to ensure mechanical strength and sealing performance.
Maintaining mechanical strength in low-temperature environments prevents degradation of sealing performance, reduces wear, avoids the risk of electrical breakdown, and ensures normal motor start-up and operation.
Smart Images
Figure CN224154099U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of motor technology, and in particular to a low-temperature resistant explosion-proof three-phase asynchronous motor. Background Technology
[0002] The Far East, bordered by the Arctic Ocean to the north and the Pacific Ocean to the east, lies above 50 degrees North latitude and is renowned for its abundant mineral resources. During winter, temperatures in the Far East can drop to -50 degrees Celsius, creating a significant demand for low-temperature resistant, explosion-proof motors. However, existing motors have the following drawbacks: 1. Conventional motors, especially those with shafts, are prone to low-temperature brittleness and reduced low-temperature impact resistance at low temperatures, leading to breakage or cracks in critical components and significantly reduced mechanical strength; 2. Ordinary lubricants experience a sharp increase in viscosity or even solidification at -55°C, increasing frictional resistance and potentially exceeding the motor's design torque requirements, resulting in starting failure or accelerated mechanical wear; 3. Ordinary seals harden and lose elasticity at low temperatures, leading to decreased sealing performance and even brittle fracture; 4. Ordinary motors lack heating devices, making them prone to condensation when stopped, which degrades the performance of winding insulation materials and increases the risk of electrical breakdown.
[0003] Therefore, how to provide a low-temperature resistant and explosion-proof three-phase asynchronous motor is a technical problem that needs to be solved by those skilled in the art. Utility Model Content
[0004] The purpose of this invention is to provide an explosion-proof three-phase asynchronous motor that can withstand low temperatures.
[0005] To achieve the above objectives, the present invention provides the following technical solution:
[0006] A low-temperature resistant explosion-proof three-phase asynchronous motor, comprising:
[0007] The casing is a cylindrical structure, with stator windings fixed to its inner wall, and heating belts passing through the stator windings;
[0008] The left end cover is detachably mounted to one end of the housing;
[0009] The right end cover is detachably mounted to the other end of the housing;
[0010] The rotating shaft is installed inside the housing, and its two ends can rotatably pass through the left end cover and the right end cover respectively. The rotor winding is located on the outer periphery of the corresponding stator winding. Shaft seals are provided at the connection between the rotating shaft and the left end cover and the right end cover. A stainless steel shaft key is provided at the end of the rotating shaft near the left end cover. A fan is installed at the end of the rotating shaft away from the shaft key.
[0011] The junction box is installed on the outer periphery of the machine housing, and its interior contains wires that connect to the stator winding, heating belt and rotor winding respectively.
[0012] Preferably, the left end cover has a first bearing chamber for installing the first bearing, the left end cover has an outer cover for the first bearing, and the left end cover has an inner cover for the first bearing. The outer cover and the inner cover cooperate to snap the first bearing into the first bearing chamber.
[0013] Preferably, the right end cover has a second bearing chamber for installing the second bearing, the right end cover has an outer cover for the second bearing, and the right end cover has an inner cover for the second bearing. The outer cover and the inner cover cooperate to engage the second bearing with the second bearing chamber.
[0014] Preferably, the shaft seal is a V-ring made of silicone rubber, and the inner circumference of the first bearing outer cover and the second bearing outer cover is provided with grooves, and the V-ring is engaged in the grooves.
[0015] Preferably, the shaft seal is a shaft surface oil seal, which is snapped into an annular groove provided on the rotating shaft, and the shaft surface oil seal abuts against the outer cover of the first bearing or the outer cover of the second bearing.
[0016] Preferably, the shaft oil seal includes: a metal skeleton and a sealing part snapped into the metal skeleton, the sealing part extending toward the first bearing outer cover or the second bearing outer cover and having a sealing lip, the sealing lip abutting against the outside of the first bearing outer cover or the second bearing outer cover, and both the sealing part and the sealing lip are made of low-temperature fluororubber.
[0017] Preferably, the fan is made of cast aluminum alloy, and the right end cover is connected to a protective cover, which is fitted over the outside of the fan to protect it.
[0018] Preferably, the shaft material is low-carbon nickel steel.
[0019] Preferably, both the first bearing chamber and the second bearing chamber are filled with low-temperature grease.
[0020] Compared to the aforementioned background technology, the present invention provides a low-temperature resistant explosion-proof three-phase asynchronous motor, comprising: a housing, a left end cover, a right end cover, a rotating shaft, and a junction box; the housing is a cylindrical structure, with a stator winding fixed to its inner wall, and a heating belt passing through the stator winding; the left end cover is detachably installed at one end of the housing; the right end cover is detachably installed at the other end of the housing; the rotating shaft passes through the inside of the housing, and both ends of the rotating shaft rotatably pass through the left end cover and the right end cover respectively; a rotor winding is provided on the outer periphery of the corresponding stator winding on the rotating shaft; shaft seals are provided at the connection points between the rotating shaft and the left end cover and the right end cover; a stainless steel shaft key is provided at the end of the rotating shaft near the left end cover; a fan is installed at the end of the rotating shaft away from the shaft key; the junction box is installed on the outer periphery of the housing, and wires are provided inside for connection to the stator winding, the heating belt, and the rotor winding respectively.
[0021] Specifically, the motor of this utility model mainly consists of a stator winding on the inner wall of the housing and a rotor winding on the shaft. The two ends of the housing are closed by a left end cover and a right end cover, and the shaft is rotated to form the motor. In addition, a junction box is provided on the outer side of the housing, and all the wiring ports of the motor are located in the junction box. It should be noted that this embodiment also has a heating belt inserted inside the stator winding. That is, the heating belt can heat the stator winding and raise the temperature, thereby increasing the temperature inside the housing. This can cause water vapor to be drawn in and condensed when the motor stops, which can reduce the performance of the winding insulation material and increase the risk of electrical breakdown. Moreover, in order to ensure that the motor can be connected and transmitted normally with other devices, a stainless steel shaft key is provided at the end of the shaft. This material can maintain good performance at low temperatures, thereby ensuring stable transmission of the power output by the motor. Attached Figure Description
[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.
[0023] Figure 1 This is a schematic diagram of the structure of a low-temperature resistant explosion-proof three-phase asynchronous motor provided in an embodiment of the present invention;
[0024] Figure 2 This is a schematic diagram of the structure of the first embodiment of the shaft seal provided in this utility model.
[0025] Figure 3 This is a schematic diagram of a second embodiment of the shaft seal provided in this utility model.
[0026] Figure 4 This is a schematic diagram of the shaft surface oil seal installation structure provided in an embodiment of the present utility model.
[0027] in:
[0028] 100 - Housing, 110 - Stator winding, 120 - Heating belt;
[0029] 200 - Left end cover; 210 - First bearing; 220 - First bearing outer cover; 230 - First bearing inner cover;
[0030] 300 - Right end cover, 310 - Second bearing, 320 - Second bearing outer cover, 330 - Second bearing inner cover;
[0031] 400-Shaft, 410-Rotor winding, 420-Shaft key, 430-Fan, 440-Protective cover;
[0032] 500-Shaft seal, 510-V-ring, 520-Shaft face oil seal, 521-Metal skeleton, 522-Sealing part, 523-Sealing lip;
[0033] 600- Junction Box; Detailed Implementation
[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0035] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0036] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left" and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the indicated position or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations of this utility model.
[0037] The purpose of this invention is to provide an explosion-proof three-phase asynchronous motor that can withstand low temperatures.
[0038] To achieve the above objectives, the present invention provides the following technical solution:
[0039] Please see Figures 1 to 4This embodiment provides a low-temperature resistant explosion-proof three-phase asynchronous motor, including: a housing 100, a left end cover 200, a right end cover 300, a rotating shaft 400, and a junction box 600; the housing 100 has a cylindrical structure, and a stator winding 110 is fixed on its inner wall, through which a heating belt 120 passes; the left end cover 200 is detachably installed at one end of the housing 100; the right end cover 300 is detachably installed at the other end of the housing 100; the rotating shaft 400 passes through the inside of the housing 100, and both ends of the rotating shaft 400 are rotatably inserted through it. The left end cover 200 and the right end cover 300, the rotating shaft 400 is located on the outer periphery of the corresponding stator winding 110 and the rotor winding 410 is provided. The connection between the rotating shaft 400 and the left end cover 200 and the right end cover 300 is provided with shaft seals 500. The end of the rotating shaft 400 near the left end cover 200 is provided with a stainless steel shaft key 420. The end of the rotating shaft 400 away from the shaft key 420 is equipped with a fan 430. The junction box 600 is installed on the outer periphery of the housing 100. The inside of the junction box is provided with wires that are connected to the stator winding 110, the heating belt 120 and the rotor winding 410 respectively.
[0040] Specifically, the motor of this utility model mainly consists of a stator winding 110 on the inner wall of the housing 100 and a rotor winding 410 on the shaft 400. The two ends of the housing 100 are closed by a left end cover 200 and a right end cover 300, and the shaft 400 is rotated to form the motor. In addition, a junction box 600 is provided on the outer side of the housing 100, and all the wiring ports of the motor are located in the junction box 600. It should be noted that in this embodiment, a heating belt 120 is also provided inside the stator winding 110. That is to say, the heating belt 120 can heat the stator winding 110, thereby increasing the temperature inside the housing 100. This can cause water vapor to be easily drawn in when the motor stops, resulting in condensation, which can reduce the performance of the winding insulation material and increase the risk of electrical breakdown. Moreover, in order to ensure that the motor can be connected and transmitted normally with other devices, a stainless steel key 420 is provided at the end of the shaft 400. This material can maintain good performance at low temperatures, thereby stably transmitting the power output by the motor.
[0041] Preferably, the left end cover 200 is provided with a first bearing chamber for installing the first bearing 210, the outer side of the left end cover 200 is provided with a first bearing outer cover 220, and the inner side of the left end cover 200 is provided with a first bearing inner cover 230. The first bearing outer cover 220 and the first bearing inner cover 230 cooperate to snap the first bearing 210 into the first bearing chamber.
[0042] Specifically, such as Figures 1 to 3As shown, a first bearing chamber with an annular shape is provided in the middle of the left end cover 200, which can just fit the first bearing 210. The rotating shaft 400 passes through the first bearing 210. At the same time, in order to prevent the first bearing 210 from dislodging from the first bearing chamber to the left or right, a first bearing outer cover 220 and a first bearing inner cover 230 are provided on the outer and inner sides of the left end cover 200, respectively. Both are connected to the left end cover 200 by bolts.
[0043] Preferably, the right end cover 300 is provided with a second bearing chamber for installing the second bearing 310, the right end cover 300 is provided with a second bearing outer cover 320 on the outside, and the right end cover 300 is provided with a second bearing inner cover 330 on the inside. The second bearing outer cover 320 and the second bearing inner cover 330 cooperate to snap the second bearing 310 into the second bearing chamber.
[0044] Specifically, such as Figure 1 As shown, similar to the left end cover 200, the right end cover 300 is installed at the right end of the housing 100. The second bearing 310 is installed in the second bearing chamber in the middle of the housing, and the outer and inner sides of the right end cover 300 are detachably equipped with the outer cover 320 of the second bearing and the inner cover 330 of the second bearing.
[0045] It should be noted that the dimensions of the first bearing chamber and the second bearing chamber need to be set according to the dimensions of the selected bearing, and the selection of the first bearing 210 and the second bearing 310 should also be compatible with the diameter of the rotating shaft 400.
[0046] Preferably, the shaft seal 500 is a V-ring 510 made of silicone rubber, and the inner circumference of the first bearing outer cover 220 and the second bearing outer cover 320 is provided with grooves, and the V-ring 510 is snapped into the grooves.
[0047] In this embodiment, the specific selection of the shaft seal 500 at the connection between the rotating shaft 400 and the left end cover 200, and between the rotating shaft 400 and the right end cover 300, varies depending on the protection level.
[0048] When the protection level is IP55, the shaft seal 500 is specifically a V-ring 510 made of silicone rubber, as detailed below. Figure 2 As shown, the V-ring 510 has a V-shaped cross-section and is directly fitted onto the outer circumference of the rotating shaft 400. In this embodiment, an annular groove is also provided at the corresponding position of the first bearing outer cover 220 and the second bearing outer cover 320. This groove can just accommodate the V-ring 510.
[0049] It should be noted that the material of the V-ring 510 in this embodiment can also be selected from materials with better overall performance according to the actual situation, and this article does not make specific limitations.
[0050] Furthermore, the shaft seal 500 is a shaft surface oil seal 520, which is snapped into the annular groove provided on the rotating shaft 400, and the shaft surface oil seal 520 abuts against the first bearing outer cover 220 or the second bearing outer cover 320.
[0051] When the protection level is IP56, IP65, and IP66, the shaft seal 500 specifically includes a shaft surface oil seal 520. The shaft surface oil seal 520 has a higher sealing level, better preventing lubricating oil leakage from the connection between the shaft 400 and the end cover, and also effectively preventing dust or moisture from entering the housing 100. Specifically, during installation, an annular groove needs to be made at the corresponding position on the shaft 400. The shaft surface oil seal 520 will then engage with the annular groove to prevent axial movement of the shaft surface oil seal 520. (Specific details are as follows...) Figure 4 As shown, it should be noted that the shaft oil seal 520 needs to be attached to the first bearing outer cover 220 or the second bearing outer cover 320 after installation.
[0052] Preferably, the shaft oil seal 520 includes: a metal frame 521 and a sealing part 522 snapped into the metal frame 521. The sealing part 522 extends toward the first bearing outer cover 220 or the second bearing outer cover 320 and is provided with a sealing lip 523. The sealing lip 523 abuts against the outside of the first bearing outer cover 220 or the second bearing outer cover 320. Both the sealing part 522 and the sealing lip 523 are made of low-temperature fluororubber.
[0053] Specifically, such as Figure 3 and Figure 4 As shown, the shaft oil seal 520 consists of two parts: a metal skeleton 521 and a rubber sealing part 522. The metal skeleton 521 enhances the overall strength of the shaft oil seal 520, preventing it from deforming and failing. The rubber sealing part 522, which is snapped into the metal skeleton 521, ensures the sealing performance of the shaft oil seal 520. To further enhance the sealing inside the housing 100, a sealing lip 523 extends from the top of the sealing part 522 toward the first bearing outer cover 220 or the second bearing outer cover 320. The end of the sealing lip 523 abuts against the first bearing outer cover 220 or the second bearing outer cover 320. This prevents dust, impurities, or moisture from the external environment from entering the housing 100 and also prevents oil leakage from inside the housing 100. Moreover, the sealing part 522 and the sealing lip 523 are an integral structure, both made of low-temperature fluororubber, which ensures good elasticity and sealing performance even in low-temperature environments.
[0054] Preferably, the fan 430 is made of cast aluminum alloy, and the right end cover 300 is connected to a protective cover 440, which is fitted over the outside of the fan 430 to protect the fan 430.
[0055] Furthermore, the 400 hinge is made of low-carbon nickel steel.
[0056] Understandably, some materials are prone to performance degradation at low temperatures. Therefore, in this embodiment, as a key output component of the motor, it will bear a large force. Thus, in this embodiment, the shaft 400 is preferably made of low-carbon nickel steel, which does not change its material properties even at low temperatures, thus ensuring its mechanical strength. Meanwhile, since the fan 430 will also rotate continuously when the shaft 400 rotates, in order to ensure the normal and long-term operation of the fan 430, the fan 430 is preferably made of cast aluminum alloy. This material is not only lightweight but also has good mechanical properties. Furthermore, in order to protect the fan 430 from being touched or entangled by foreign objects during operation, a protective cover 440 is installed on the outside of the right end cover 300, which can just cover the entire fan 430.
[0057] It should be noted that all connecting bolts used in the motor in this embodiment are made of stainless steel, which has good mechanical properties and will not fail at low temperatures.
[0058] Preferably, both the first bearing chamber and the second bearing chamber are filled with low-temperature grease.
[0059] In addition, in this embodiment, the lubrication at the connection between the rotating shaft 400 and the first bearing 210 and the second bearing 310 is all done with aerospace-grade low-temperature grease. This grease can still have a good lubrication effect at low temperatures and will not cause viscosity increase or solidification.
[0060] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.
[0061] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.
[0062] The embodiments provided by this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of this utility model.
Claims
1. A low temperature resistant explosion-proof three-phase asynchronous motor, characterized in that, include: The housing (100) is a cylindrical structure, and a stator winding (110) is fixed on its inner wall. A heating belt (120) passes through the stator winding (110). A left end cap (200) is detachably mounted to one end of the housing (100); The right end cap (300) is detachably mounted to the other end of the housing (100); A rotating shaft (400) is installed inside the housing (100), and the two ends of the rotating shaft (400) are rotatably connected to the left end cover (200) and the right end cover (300), respectively. A rotor winding (410) is provided on the outer periphery of the rotating shaft (400) corresponding to the stator winding (110). A shaft seal (500) is provided at the connection between the rotating shaft (400) and the left end cover (200) and the right end cover (300). A stainless steel shaft key (420) is provided at the end of the rotating shaft (400) near the left end cover (200). A fan (430) is installed at the end of the rotating shaft (400) away from the shaft key (420). A junction box (600) is installed on the outer periphery of the housing (100), and wires are provided inside to connect to the stator winding (110), the heating belt (120) and the rotor winding (410) respectively.
2. The low temperature resistant explosion-proof three-phase induction motor according to claim 1, characterized in that, The left end cover (200) is provided with a first bearing chamber for installing the first bearing (210). The outer side of the left end cover (200) is provided with a first bearing outer cover (220), and the inner side of the left end cover (200) is provided with a first bearing inner cover (230). The first bearing outer cover (220) and the first bearing inner cover (230) cooperate to snap the first bearing (210) into the first bearing chamber.
3. The low temperature resistant explosion-proof three-phase induction motor according to claim 2, characterized in that, The right end cover (300) is provided with a second bearing chamber for installing the second bearing (310). The outer side of the right end cover (300) is provided with a second bearing outer cover (320), and the inner side of the right end cover (300) is provided with a second bearing inner cover (330). The second bearing outer cover (320) and the second bearing inner cover (330) cooperate to snap the second bearing (310) into the second bearing chamber.
4. The low temperature resistant explosion-proof three-phase induction motor according to claim 3, characterized in that, The shaft seal (500) is a V-ring (510) made of silicone rubber. The inner circumference of the first bearing outer cover (220) and the second bearing outer cover (320) is provided with grooves, and the V-ring (510) is snapped into the grooves.
5. The low temperature resistant explosion-proof three-phase induction motor according to claim 3, characterized in that, The shaft seal (500) is a shaft surface oil seal (520). The shaft surface oil seal (520) is snapped into the annular groove provided on the rotating shaft (400), and the shaft surface oil seal (520) abuts against the first bearing outer cover (220) or the second bearing outer cover (320).
6. The low-temperature resistant explosion-proof three-phase asynchronous motor according to claim 5, characterized in that, The shaft oil seal (520) includes a metal frame (521) and a sealing part (522) snapped into the metal frame (521). The sealing part (522) extends toward the first bearing outer cover (220) or the second bearing outer cover (320) and is provided with a sealing lip (523). The sealing lip (523) abuts against the outside of the first bearing outer cover (220) or the second bearing outer cover (320). The sealing part (522) and the sealing lip (523) are both made of low-temperature fluororubber.
7. The low temperature resistant explosion-proof three-phase induction motor according to claim 3, characterized in that, The fan (430) is made of cast aluminum alloy, and the right end cover (300) is connected to a protective cover (440). The protective cover (440) is fitted on the outside of the fan (430) to protect the fan (430).
8. The low temperature resistant explosion-proof three-phase induction motor according to claim 1, characterized in that, The shaft (400) is made of low-carbon nickel steel.
9. The low temperature resistant explosion-proof three-phase induction motor according to claim 3, characterized in that, Both the first bearing chamber and the second bearing chamber are filled with low-temperature grease.