A balanced permanent magnet high-temperature motor

Abstract

The present invention relates to the technical field of motors, and particularly to a balanced permanent magnet high-temperature motor, comprising: a housing with an installation cavity and a heat insulation cavity respectively arranged at both ends; a stator fixedly installed in the installation cavity; a rotating shaft rotatably installed in the housing, passing through the installation cavity and the heat insulation cavity, and extending outwards from one end located in the heat insulation cavity; a rotor sleeved on the rotating shaft and aligned with the stator; two bearings, both sleeved on the rotating shaft and respectively located at both ends of the heat insulation cavity; two heat dissipation plates, both sleeved on the rotating shaft and located between the two bearings; an interval is formed between the two heat dissipation plates. The present invention can effectively solve the problems of poor heat dissipation capacity and low running stability of traditional high-temperature motors.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and particularly to a balanced permanent magnet high-temperature motor. Background Art

[0002] With the rapid development of modern industry, the application of high-temperature motors in various high-temperature environments has gradually increased, especially in industries such as metallurgy, chemical industry, steel, and power. The traditional high-temperature motor design usually connects a common motor and a fan blade through a long connecting rod. This connection method results in poor heat insulation effect of the motor system. In a high-temperature environment, heat will be transferred to the stator and rotor, causing the permanent magnet to demagnetize, thereby affecting its performance and service life. At the same time, this structure will also lead to low coaxiality of the motor shaft, resulting in unbalanced forces during the operation of the motor, which will significantly reduce the life of the bearings and increase the maintenance cost. Summary of the Invention

[0003] The present invention provides a balanced permanent magnet high-temperature motor, which can effectively solve the problems of poor heat dissipation capacity and low running stability of the traditional high-temperature motor in the background art.

[0004] A balanced permanent magnet high-temperature motor provided by the present invention includes:

[0005] A housing with an installation cavity and a heat insulation cavity respectively provided at both ends;

[0006] A stator fixedly installed in the installation cavity;

[0007] A rotating shaft rotatably installed in the housing, passing through the installation cavity and the heat insulation cavity, and extending outward from one end located in the heat insulation cavity;

[0008] A rotor sleeved on the rotating shaft and aligned with the stator;

[0009] Two bearings, both sleeved on the rotating shaft and respectively located at both ends of the heat insulation cavity;

[0010] Two heat dissipation plates, both sleeved on the rotating shaft and located between the two bearings; there is a gap formed between the two heat dissipation plates.

[0011] Further, slots are provided on both of the two heat dissipation plates, and the slots face the bearings;

[0012] Two first oil holes are provided on the heat insulation cavity, and the two first oil holes are respectively aligned with the two slots.

[0013] Further, a flow guiding groove group is also provided on the end face of the heat dissipation plate facing the bearing. The flow guiding groove group includes a first annular groove, a second annular groove, and a plurality of communication grooves respectively communicating the first annular groove and the second annular groove at both ends.

[0014] Furthermore, two second oil holes are provided on the heat insulation cavity, such that the two bearings are located in the space between the ends of the two second oil holes on the inner wall of the heat insulation cavity.

[0015] Furthermore, a plurality of guiding grooves are provided on the end face of the heat insulation cavity away from the installation cavity. The portion of the guiding groove away from the second oil hole is annular, and the portion of the guiding groove close to the second oil hole gradually converges towards the second oil hole.

[0016] Furthermore, both of the two second oil holes form an angle with the axis of the rotating shaft.

[0017] Furthermore, a conical section is provided on the rotating shaft, and the rotor is located at the conical section.

[0018] Furthermore, heat dissipation ribs extending radially are respectively provided on the outer sides of the installation cavity and the heat insulation cavity.

[0019] Furthermore, a heat dissipation fan is further included, which is arranged in the installation cavity and sleeved on the rotating shaft.

[0020] Furthermore, the heat dissipation fan is provided with a fairing, and the fairing has a conical structure with a gradually decreasing outer diameter.

[0021] Through the technical solution of the present invention, the following technical effects can be achieved:

[0022] This high-temperature motor adopts a balanced rotor structure design. The rotor and the fan blade are distributed at both ends of the bearing, effectively balancing the weights on both sides of the support point, so that the rotating shaft is more stable during rotation, enabling it to adapt to the working conditions of high-speed operation. This high-temperature motor also increases the local diameter of the rotating shaft through the heat dissipation plate, so that part of the heat will be dissipated by the heat dissipation plate when reaching the heat dissipation plate. Moreover, the gap formed between the two heat dissipation plates enables the heat transfer between the heat dissipation plates to be carried out only by means of thermal radiation, and the heat transfer efficiency is very low. Therefore, the heat transferred to the rotor can be effectively reduced. Description of the Drawings

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 It is a schematic structural diagram of the balanced permanent magnet high-temperature motor in the present invention;

[0025] Figure 2 It is a side sectional view of the balanced permanent magnet high-temperature motor in the present invention;

[0026] Figure 3 In the present inventionFigure 2 Enlarged view of part A;

[0027] Figure 4 Structural schematic diagram of the rotating shaft part in the present invention;

[0028] Figure 5 Front view of the rotating shaft part in the present invention;

[0029] Figure 6 In the present invention Figure 5 Cross-sectional view of part B;

[0030] Figure 7 In the present invention Figure 5 Cross-sectional view of part C;

[0031] Figure 8 In the present invention Figure 5 Cross-sectional view of part D;

[0032] Reference numerals: 1, housing; 11, installation cavity; 12, heat insulation cavity; 121, first oil hole; 122, second oil hole; 123, guiding groove; 2, stator; 3, rotating shaft; 31, conical section; 4, rotor; 5, bearing; 6, heat dissipation plate; 61, slotted opening; 62, first annular groove; 63, second annular groove; 64, communication groove; 7, heat dissipation fan; 71, fairing. Detailed implementation manners

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0034] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0035] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0036] A balanced permanent magnet high-temperature motor, as Figures 1 - 8 shown, includes:

[0037] A housing 1 for carrying other components of this high-temperature motor; the housing 1 is integrally in a shell structure, and installation cavities 11 and heat insulation cavities 12 are respectively formed at both ends of the shell;

[0038] A stator 2 fixedly installed in the installation cavity 11;

[0039] A rotating shaft 3 rotatably installed in the housing 1; the main body of the rotating shaft 3 passes through the installation cavity 11 and the heat insulation cavity 12, and after one end of the rotating shaft 3 passes through the heat insulation cavity 12, it extends outwards from one end located in the heat insulation cavity 12, and the extended part is used to drive the rotation of the fan blade;

[0040] A rotor 4 sleeved on the rotating shaft 3 and aligned with the stator 2; permanent magnets are arranged on the rotor 4, and the stator 2 can form a changing magnetic field by changing the coil current, thereby driving the rotation of the rotor 4. Its specific structure and principle are both prior arts and will not be elaborated here;

[0041] Two bearings 5, both sleeved on the rotating shaft 3 and respectively located at both ends of the heat insulation cavity 12;

[0042] Two heat dissipation plates 6, both sleeved on the rotating shaft 3 and located between the two bearings 5; the diameter of each heat dissipation plate 6 needs to be significantly larger than the diameter of the rotating shaft 3; both of the two heat dissipation plates 6 are made of carbon steel with good thermal conductivity; after the two heat dissipation plates 6 are installed, a certain interval needs to be formed between them.

[0043] This high-temperature motor adopts a balanced rotor structure design, and the rotor 4 and the fan blade are distributed at both ends of the bearing 5, thereby effectively balancing the weights on both sides of the support points (i.e., at the positions of the bearings 5), so that the rotating shaft 3 is more stable during rotation, enabling this high-temperature motor to operate more smoothly. In the case of high-speed operation, the bearing friction loss can be effectively reduced and the service life can be extended.

[0044] When the high-temperature motor is working, the high-temperature motor is installed on the equipment as a whole through the casing 1, and the end equipped with the fan blade will extend into the high-temperature area. During operation, the heat in the high-temperature area will mainly be transferred to the rotor 4 through the rotating shaft 3. When the temperature is too high, it will cause the permanent magnet on the rotor 4 to demagnetize, thereby affecting the performance of the high-temperature motor. The high-temperature motor increases the local diameter of the rotating shaft 3 through the heat sink 6, so that when the heat reaches the heat sink 6, it will be partially shared by the heat sink 6, and the gap formed between the two heat sinks 6 makes the heat transfer between the heat sinks 6 only through thermal radiation, and the heat transfer efficiency is very low, so the heat transferred to the rotor 4 can be effectively reduced. At the same time, under normal circumstances, the bearing 5 will be coated with lubricating oil, and the heat on the heat sink 6 can be transferred to the lubricating oil to further achieve cooling, and the lubricating oil can be heated to improve the fluidity of the lubricating oil and the lubrication effect, thereby further reducing the bearing friction loss.

[0045] Since the high-temperature motor is in a working state in a high-temperature environment, the oil on the bearing 5 is easy to volatilize, so the high-temperature motor is provided with slots 61 on the two heat sinks 6, and the slots 61 are circumferentially around the heat sink 6; the slots 61 of each heat sink 6 are all oriented toward a corresponding bearing 5, so that the slots 61 are located between the heat sink 6 and the bearing 5; when the high-temperature motor is working, the oil can fill the entire slot 61, ensuring that the oil can be replenished in time when the bearing 5 is short of oil; at the same time, the oil in the slots 61 can also achieve a heat conduction and heat absorption effect, thereby being able to quickly dissipate the heat on the heat sink 6.

[0046] Two first oil holes 121 may be provided on the heat-insulating cavity 12 , and the two first oil holes 121 are aligned with the two slots 61 , respectively. During operation, the inside of the high-temperature motor may be replenished with oil through the two first oil holes 121 .

[0047] In order to enable the oil to be quickly spread in the slot 61 and enter the bearing 5, it is preferred to further provide a guide groove group on the end surface of the heat sink 6 facing the bearing 5, the guide groove group including a first annular groove 62 and a second annular groove 63, the diameter of the first annular groove 62 is larger than that of the second annular groove 63, and a plurality of connecting grooves 64 whose two ends are respectively connected to the first annular groove 62 and the second annular groove 63. In this way, during operation, the oil will first be quickly guided to the outer annular direction of the heat sink 6 through the first annular groove 62, so that the oil can start to absorb the heat at various locations on the heat sink 6 at the first time; then, as the rotating shaft 3 rotates, the oil will be guided by the connecting groove 64 to the second annular groove 63, so that the oil is evenly distributed at the inner annular direction of the heat sink 6, and the second annular groove 63 is directly facing between the outer ring and the inner ring of the bearing 5, so that the oil can evenly enter the bearing 5, ensuring that the lubrication effect at various locations of the bearing 5 is consistent.

[0048] The two communication grooves 64 are both inclined so as to form a certain angle with the heat dissipation plate 6, but according to their corresponding positions, the inclination directions of the communication grooves 64 on the two heat dissipation plates 6 are different: on the heat dissipation plate 6 close to the fan blade, the end of the communication groove 64 far from the rotating shaft 3 is inclined towards the rotation direction of the rotating shaft 3; on the heat dissipation plate 6 close to the installation cavity 11, the end of the communication groove 64 far from the rotating shaft 3 is inclined towards the opposite direction of the rotation of the rotating shaft 3. The main principle of adopting this design is as follows:

[0049] Since the positions of the two heat dissipation plates 6 are different due to their distances from the high-temperature environment, the temperatures on the two heat dissipation plates 6 will also be different. For the hotter heat dissipation plate 6 (i.e., the heat dissipation plate 6 close to the fan blade), it requires the oil to flow quickly to take away the heat on the heat dissipation plate 6. Therefore, the communication groove 64 is inclined towards the rotation direction of the rotating shaft 3, so that when the heat dissipation plate 6 rotates, the oil in the first annular groove 62 can be quickly sent into the second annular groove 63 by the communication groove 64, accelerating the flow of the oil, and thus taking away more heat. For the relatively lower-temperature heat dissipation plate 6 (i.e., the heat dissipation plate 6 close to the installation cavity 11), the heating speed of the oil is not so fast. Instead, the slower flow of the externally input low-temperature oil can achieve a better cooling effect on the heat dissipation plate 6. Therefore, the communication groove 64 is inclined towards the opposite direction of the rotation of the rotating shaft 3, so that when the heat dissipation plate 6 rotates, the oil in the first annular groove 62 can slowly flow through the communication groove 64 to reach the second annular groove 63, realizing the function of slow oil flow. At the same time, since the two heat dissipation plates 6 are symmetrically installed, the actual structures of the two heat dissipation plates 6 are the same, thus effectively saving the processing cost and avoiding errors during installation.

[0050] In this high-temperature motor, two second oil holes 122 can also be provided on the heat insulation cavity 12. The second oil holes 122 can be used to discharge waste oil. In a high-temperature environment, the waste oil can also discharge the absorbed heat together, achieving more efficient cooling. When processing the second oil holes 122, it is necessary to place the two bearings 5 in the interval at one end of the two second oil holes 122 on the inner wall of the heat insulation cavity 12. At this time, the connection ends of the second oil holes 122 with the inner wall of the heat insulation cavity 12 and the connection ends of the first oil holes 121 with the inner wall of the heat insulation cavity 12 will be on both sides of the bearing 5, so as to ensure that the oil will be discharged only after passing through the bearing 5.

[0051] In order to make the oil pass through as long a path as possible to carry away more heat, the first oil hole 121 and the second oil hole 122 can be respectively arranged on the upper and lower sides of the heat insulation cavity 12. At this time, in order to prevent the hot oil from staying in the heat insulation cavity 12, a plurality of guiding grooves 123 can be arranged on the end face of the heat insulation cavity 12 away from the installation cavity 11 to guide the hot oil to the second oil hole 122 so that the hot oil can flow out quickly. The guiding grooves 123 are integrally arranged on the end face of the installation cavity 11 for commutation. The part away from the second oil hole 122 is annular, and the part of the guiding grooves 123 close to the second oil hole 122 is two wire grooves, and the distance between the two wire grooves gradually converges towards the second oil hole 122.

[0052] If the oil is discharged too fast and the oil replenishment speed cannot keep up, air will be mixed into the oil in the high-temperature motor, resulting in noise and even affecting the stable operation of the high-temperature motor. Therefore, it is preferably to arrange the two second oil holes 122 in a form that forms an angle with the axis of the rotating shaft 3, that is, to make the slope of the second oil hole 122 gentler, and the oil will decelerate when passing through the second oil hole 122, so as to ensure that the high-temperature motor will not discharge oil too fast. And, the angle between the second oil hole 122 close to the fan blade and the axis of the rotating shaft 3 can be made smaller than the angle between the second oil hole 122 close to the installation cavity 11 and the axis of the rotating shaft 3, so that the slope of the second oil hole 122 in the area where the oil flow rate is faster (that is, the area close to the fan blade) is smaller.

[0053] Preferably, a conical section 31 is arranged on the rotating shaft 3, the rotor 4 is located at the conical section 31, the center of the rotor 4 is a cylindrical through hole, and the cylindrical through hole of the rotor 4 and the conical section 31 are synchronously fixed by means of key connection. This structure not only facilitates the installation between the rotor 4 and the rotating shaft 3, but also reduces the contact area between the rotor 4 and the rotating shaft 3, and further reduces the heat transferred to the rotor 4. The rotor 4 can be selected whether to install additional limiting and supporting structures according to the size of the high-temperature motor. These structures should be directly installed in the stator 2 or the installation cavity 11 as much as possible to avoid contacting the rotating shaft 3.

[0054] Preferably, heat dissipation ribs extending radially are respectively arranged on the outer sides of the installation cavity 11 and the heat insulation cavity 12 to dissipate the heat in the installation cavity 11 and the heat insulation cavity 12. It should be noted that since the temperatures of the installation cavity 11 and the heat insulation cavity 12 are different, the corresponding heat dissipation ribs cannot be connected together.

[0055] In order to further improve the heat dissipation capacity, a heat dissipation fan 7 is also included, which is arranged in the installation cavity 11 and sleeved on the rotating shaft 3. The heat dissipation fan 7 cools the stator 2 by agitating the air flow in the installation cavity 11. On the end face of the installation cavity 11, a plurality of ventilation holes can also be arranged so that air flow exchange can occur inside and outside the installation cavity 11 when the heat dissipation fan 7 rotates, thereby taking out the heat inside the installation cavity 11.

[0056] If the airflow in the installation cavity 11 is too chaotic, it will affect the stability of the high-temperature motor during operation. At this time, a fairing 71 can be provided on the cooling fan 7. The fairing 71 has a conical structure with a gradually decreasing outer diameter. When the cooling fan 7 is operating, since the fairing 71 can isolate most of the airflow exchange on both sides, a relatively higher air pressure can be maintained inside the fairing 71 compared to the outside. This air pressure will hold the fairing 71 in place and prevent it from vibrating excessively, thus ensuring the stable operation of the rotating shaft 3.

[0057] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification merely illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and all such changes and improvements fall within the scope of the present invention as claimed. The scope of the present invention as claimed is defined by the appended claims and their equivalents.

Claims

1. A balanced permanent magnet high temperature motor, characterized in that: include: The housing (1) has a mounting cavity (11) and a heat insulation cavity (12) respectively disposed at two ends; A stator (2) is fixedly mounted in the mounting cavity (11); A rotating shaft (3) is rotatably mounted in the housing (1), passes through the mounting cavity (11) and the heat-insulating cavity (12), and extends outward from one end located in the heat-insulating cavity (12); A rotor (4) is mounted on the rotating shaft (3) and aligned with the stator (2); Two bearings (5) are both sleeved on the rotating shaft (3) and are respectively located at two ends of the heat insulation cavity (12); Two heat dissipation plates (6) are both sleeved on the rotating shaft (3) and are located between the two bearings (5); a gap is formed between the two heat dissipation plates (6); and slots (61) are provided on the two heat dissipation plates (6), and the slots (61) face the bearings (5); Two first oil holes (121) are provided on the heat-insulating cavity (12), and the two first oil holes (121) are respectively aligned with the two slots (61); A guide groove group is also provided on the end surface of the heat dissipation plate (6) facing the bearing (5), the guide groove group comprising a first annular groove (62), a second annular groove (63), and a plurality of connecting grooves (64) whose two ends are respectively connected to the first annular groove (62) and the second annular groove (63); In the heat dissipation plate (6) close to the fan blade, the connecting groove (64) is inclined toward the turning direction of the rotating shaft (3); In the heat dissipation plate (6) close to the installation cavity (11), the connecting groove (64) is inclined in the opposite direction of the rotation direction of the rotating shaft (3).

2. The balanced permanent magnet high temperature motor according to claim 1, characterized in that: Two second oil holes (122) are arranged on the heat-insulating cavity (12), so that the two bearings (5) are located in a gap between the two second oil holes (122) at one end of the inner wall of the heat-insulating cavity (12).

3. The balanced permanent magnet high temperature motor according to claim 2, characterized in that: A plurality of guide grooves (123) are arranged on the end surface of the heat insulation cavity (12) away from the installation cavity (11); the portion of the guide groove (123) away from the second oil hole (122) is annular, and the portion of the guide groove (123) close to the second oil hole (122) gradually converges toward the second oil hole (122).

4. The balanced permanent magnet high temperature motor according to claim 2, characterized in that: The two second oil holes (122) each form an angle with the axis of the rotating shaft (3).

5. The balanced permanent magnet high temperature motor according to claim 1, characterized in that: A conical section (31) is provided on the rotating shaft (3), and the rotor (4) is located at the conical section (31).

6. The balanced permanent magnet high temperature motor according to claim 1, characterized in that: Heat dissipation ribs extending in the radial direction are respectively arranged on the outer sides of the installation cavity (11) and the heat insulation cavity (12).

7. The balanced permanent magnet high temperature motor according to claim 1, characterized in that: It also includes a heat dissipation fan (7), which is arranged in the installation cavity (11) and sleeved on the rotating shaft (3).

8. The balanced permanent magnet high temperature motor according to claim 7, characterized in that: The heat dissipation fan (7) is provided with a fairing (71), and the fairing (71) is in a conical structure with a diameter gradually decreasing toward the outside.

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