Balanced permanent magnet high-temperature motor

Abstract

The invention relates to the technical field of motors, in particular to a balanced type permanent magnet high-temperature motor, which comprises a casing, a permanent magnet, a permanent magnet and a permanent magnet, the stator is fixedly mounted in the mounting cavity; the rotating shaft is rotationally mounted in the machine shell, penetrates through the mounting cavity and the heat insulation cavity, and extends outwards from one end, located in the heat insulation cavity, of the rotating shaft; the rotor is sleeved on the rotating shaft and is aligned with the stator; the two bearings are arranged on the rotating shaft in a sleeving mode and located at the two ends of the heat insulation cavity correspondingly; the two heat dissipation plates are arranged on the rotating shaft in a sleeving mode and located between the two bearings; and a gap is formed between the two heat dissipation plates. The high-temperature motor can effectively solve the problems that a traditional high-temperature motor is poor in heat dissipation capacity and low in operation stability.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular 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 the metallurgical, chemical, steel, electric power and other industries. The traditional high-temperature motor design usually uses ordinary motors and fan blades to connect through long connecting rods. The connection method leads to poor thermal insulation of the motor system. In high-temperature environments, heat will be transferred to the stator and rotor, causing permanent magnets to demagnetize, thus affecting their 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 maintenance costs. 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 traditional high temperature motors in the background art.

[0004] The present invention provides a balanced permanent magnet high temperature motor, comprising: The housing has a mounting cavity and a heat insulation cavity respectively arranged at both ends; The stator is fixedly installed in the installation cavity; A rotating shaft is rotatably mounted in the housing, passes through the mounting cavity and the heat-insulating cavity, and extends outward from one end of the heat-insulating cavity; A rotor is mounted on the rotating shaft and aligned with the stator; Two bearings are both sleeved on the rotating shaft and are respectively located at two ends of the heat insulation cavity; The two heat sinks are both sleeved on the rotating shaft and located between the two bearings; a gap is formed between the two heat sinks.

[0005] Furthermore, both heat sinks are provided with slots, the slots facing the bearings; Two first oil holes are arranged on the heat-insulating cavity, and the two first oil holes are respectively aligned with the two slots.

[0006] Furthermore, a guide groove group is provided on the end surface of the heat dissipation plate facing the bearing, and the guide groove group includes a first annular groove, a second annular groove, and a plurality of connecting grooves whose two ends are respectively connected to the first annular groove and the second annular groove.

[0007] Furthermore, two second oil holes are arranged on the heat-insulating cavity, so that the two bearings are located in the interval between the two second oil holes at one end of the inner wall of the heat-insulating cavity.

[0008] Furthermore, a plurality of guide grooves are arranged on the end surface of the heat insulation cavity away from the installation cavity, the portion of the guide groove away from the second oil hole is annular, and the portion of the guide groove close to the second oil hole gradually converges toward the second oil hole.

[0009] Furthermore, the two second oil holes each form an angle with the axis of the rotating shaft.

[0010] Furthermore, a conical section is provided on the rotating shaft, and the rotor is located at the conical section.

[0011] Furthermore, heat dissipation ribs extending in the radial direction are respectively arranged on the outer sides of the installation cavity and the heat insulation cavity.

[0012] Furthermore, it also includes a heat dissipation fan, which is arranged in the installation cavity and sleeved on the rotating shaft.

[0013] Furthermore, the heat dissipation fan is provided with a fairing, and the fairing is a conical structure with a diameter gradually decreasing toward the outside.

[0014] The technical solution of the present invention can achieve the following technical effects: This high temperature motor adopts a balanced rotor structure design. The rotor and the fan blades are distributed at both ends of the bearing, which effectively balances the weight on both sides of the support point, making the shaft more stable when rotating, so that it can adapt to high-speed operation conditions. This high temperature motor also increases the local diameter of the shaft through the heat sink, so that when the heat reaches the heat sink, it will be partially distributed by the heat sink, and the gap formed between the two heat sinks makes the heat transfer between the heat sinks only by thermal radiation, and the heat transfer efficiency is very low, so it can effectively reduce the heat transferred to the rotor. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a structural schematic diagram of a balanced permanent magnet high temperature motor in the present invention; Figure 2 It is a side sectional view of the balanced permanent magnet high temperature motor of the present invention; Figure 3 For the present invention Figure 2 A magnified image of point A; Figure 4 It is a structural schematic diagram of the rotating shaft part of the present invention; Figure 5 It is a front view of the rotating shaft part of the present invention; Figure 6 For the present invention Figure 5 A cross-sectional view at point B; Figure 7 For the present invention Figure 5 Sectional view at point C of FIG. Figure 8 For the present invention Figure 5 The cross-sectional view at point D of FIG. Figure numerals: 1, casing; 11, installation cavity; 12, insulation cavity; 121, first oil hole; 122, second oil hole; 123, guide groove; 2, stator; 3, rotating shaft; 31, conical section; 4, rotor; 5, bearing; 6, heat sink; 61, slot; 62, first annular groove; 63, second annular groove; 64, connecting groove; 7, cooling fan; 71, fairing. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0018] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by “center”, “up”, “down”, “left”, “right”, “vertical”, “horizontal”, “inside” and “outside”, etc., are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0019] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] A balanced permanent magnet high temperature motor, such as Figures 1 to 8 As shown, including: The casing 1 is used to carry other components of the high temperature motor; the casing 1 is a shell structure as a whole, and a mounting cavity 11 and a heat insulation cavity 12 are formed at both ends of the shell respectively; The stator 2 is fixedly installed in the installation cavity 11; The rotating shaft 3 is rotatably mounted in the housing 1; the main body of the rotating shaft 3 passes through the mounting cavity 11 and the heat-insulating cavity 12, and one end of the rotating shaft 3 extends outward from one end of the heat-insulating cavity 12 after passing through the heat-insulating cavity 12, and the extended part is used to drive the rotation of the fan blade; The rotor 4 is mounted on the rotating shaft 3 and aligned with the stator 2. The rotor 4 is provided with a permanent magnet, and the stator 2 can form a changing magnetic field by changing the coil current, thereby driving the rotation of the rotor 4. The specific structure and principle are all existing technologies and will not be described in detail here. Two bearings 5 ​​are both sleeved on the rotating shaft 3 and are respectively located at two ends of the heat insulation cavity 12; The two heat sinks 6 are both mounted on the rotating shaft 3 and located between the two bearings 5. The diameter of each heat sink 6 needs to be significantly larger than the diameter of the rotating shaft 3. The two heat sinks 6 are both made of carbon steel with good thermal conductivity. After the two heat sinks 6 are installed, a certain distance needs to be formed between them.

[0021] This high temperature motor adopts a balanced rotor structure design, and the rotor 4 and the fan blades are distributed at both ends of the bearing 5, thereby effectively balancing the weight on both sides of the support point (i.e., the position of the bearing 5), so that the shaft 3 is more stable when rotating, and the high temperature motor can run more smoothly. Under high-speed operation, it can effectively reduce bearing friction loss and extend service life.

[0022] 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.

[0023] 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.

[0024] Two first oil holes 121 may be provided on the heat-insulating cavity 12 , and the two first oil holes 121 are respectively aligned with the two slots 61 . During operation, the inside of the high-temperature motor may be replenished with oil through the two first oil holes 121 .

[0025] 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.

[0026] The two connecting grooves 64 are both inclined so that they form a certain angle with the heat sink 6, but the inclination directions of the connecting grooves 64 on the two heat sinks 6 are different according to their corresponding positions: on the heat sink 6 close to the fan blade, the end of the connecting groove 64 away from the shaft 3 is inclined toward the direction of the shaft 3; on the heat sink 6 close to the installation cavity 11, the end of the connecting groove 64 away from the shaft 3 is inclined toward the opposite direction of the shaft 3. The main principles of this design are as follows: Since the two heat sinks 6 are located at different distances from the high temperature environment, the temperatures on the two heat sinks 6 will also be different. For the hotter heat sink 6 (i.e. the heat sink 6 close to the fan blade), the oil needs to flow quickly to take away the heat on the heat sink 6, so the connecting groove 64 is tilted toward the turning direction of the rotating shaft 3, so that when the heat sink 6 rotates, the oil in the first annular groove 62 can be quickly sent to the second annular groove 63 by the connecting groove 64, accelerating the flow of the oil, thereby taking away more heat. For the heat sink 6 with a relatively low temperature (i.e. the heat sink 6 close to the mounting cavity 11), the heating speed of the oil is not so fast, but the low-temperature oil input from the outside flows more slowly, which can have a better cooling effect on the heat sink 6, so the connecting groove 64 is tilted in the opposite direction of the turning direction of the rotating shaft 3, so that when the heat sink 6 rotates, the oil in the first annular groove 62 can slowly flow through the connecting groove 64 to the second annular groove 63, realizing the function of making the oil flow slowly. At the same time, since the two heat sinks 6 are in a symmetrical state during installation, the actual structures of the two heat sinks 6 are consistent, thereby effectively saving processing costs and avoiding errors during installation.

[0027] In the present high temperature motor, two second oil holes 122 can 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, thereby achieving more efficient cooling. When processing the second oil holes 122, it is necessary to place the two bearings 5 ​​in the gap between the two second oil holes 122 at one end of the inner wall of the heat insulation cavity 12. At this time, the connection end between the second oil hole 122 and the inner wall of the heat insulation cavity 12, and the connection end between the first oil hole 121 and the inner wall of the heat insulation cavity 12 will be on both sides of the bearing 5, thereby ensuring that the oil will not be discharged until it passes through the bearing 5.

[0028] In order to make the oil travel as long as possible to take 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 guide grooves 123 can be arranged on the end surface 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 guide groove 123 is arranged on the end surface of the installation cavity 11 as a whole, and the part away from the second oil hole 122 is annular, and the part of the guide groove 123 close to the second oil hole 122 is two line grooves, and the distance between the two line grooves gradually shrinks toward the second oil hole 122.

[0029] If the oil is discharged too quickly and the speed of oil replenishment cannot keep up, air will be mixed into the oil in the high-temperature motor, causing noise and even affecting the smooth operation of the high-temperature motor. Therefore, it is preferred to set the two second oil holes 122 to form an angle with the axis of the rotating shaft 3, that is, to make the slope of the second oil hole 122 slow down, and the oil will slow down when passing through the second oil hole 122, thereby ensuring that the high-temperature motor does not discharge oil too quickly. In addition, the angle between the second oil hole 122 near the fan blade and the axis of the rotating shaft 3 can be smaller than the angle between the second oil hole 122 near the mounting cavity 11 and the axis of the rotating shaft 3, so that the slope of the second oil hole 122 in the area with a faster oil flow rate (i.e., the area near the fan blade) is smaller.

[0030] Preferably, a conical section 31 is provided 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 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, further reducing the heat transferred to the rotor 4. The rotor 4 can choose whether to add additional limit and support 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 contact with the rotating shaft 3.

[0031] It is preferred to provide radially extending heat dissipation ribs on the outside of the installation cavity 11 and the insulation cavity 12, respectively, to dissipate the heat in the installation cavity 11 and the insulation cavity 12. It should be noted that since the temperatures of the installation cavity 11 and the insulation cavity 12 are different, their corresponding heat dissipation ribs cannot be connected together.

[0032] In order to further improve the heat dissipation capability, a heat dissipation fan 7 is further 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 stirring the airflow in the installation cavity 11. A plurality of vents may also be arranged on the end surface of the installation cavity 11, so that when the heat dissipation fan 7 rotates, airflow exchange can be generated inside and outside the installation cavity 11, thereby taking out the heat inside the installation cavity 11.

[0033] 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 diameter that gradually decreases outward. When the cooling fan 7 is working, the fairing 71 can isolate most of the airflow exchange on both sides, so that a larger air pressure can be stored in the fairing 71 than outside. This air pressure will support the fairing 71 so that it will not vibrate too much, thereby ensuring the stable operation of the rotating shaft 3.

[0034] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A balanced permanent magnet high temperature motor, characterized in that: include: The housing (1) has an installation 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); The two heat dissipation plates (6) are both sleeved on the rotating shaft (3) and located between the two bearings (5); a gap is formed between the two heat dissipation plates (6).

2. The balanced permanent magnet high temperature motor according to claim 1, characterized in that: Both of the two heat dissipation plates (6) are provided with slots (61), and the slots (61) face the bearing (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).

3. The balanced permanent magnet high temperature motor according to claim 2, characterized in that: 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).

4. The balanced permanent magnet high temperature motor according to claim 2, 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).

5. The balanced permanent magnet high temperature motor according to claim 4, 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).

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

7. 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).

8. 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).

9. 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).

10. The balanced permanent magnet high temperature motor according to claim 9, 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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