Ventilation structure of air-cooled permanent magnet all-in-one machine

Abstract

The utility model discloses a ventilation structure of an air-cooled permanent magnet all-in-one machine, and relates to the field of motor equipment, in particular to the air-cooled permanent magnet all-in-one machine which comprises a machine base and a radiator, the radiator is used for fixing an installation assembly of a frequency converter, and the ventilation structure is characterized by comprising a first air channel, a second air channel and a third air channel, the radiator is used for radiating the base; the second air channel is arranged in contact with the radiator and used for radiating heat of the radiator, the first air channel is communicated with the second air channel, and the first air channel and the second air channel share the same set of fans; according to the ventilation structure of the air-cooled permanent magnet all-in-one machine, the radiator is additionally arranged and used for guiding out heat of the frequency converter, and the frequency converter air channel and the machine base air channel are communicated and share the same set of fans, so that synchronous heat dissipation of the motor and the frequency converter is achieved, the integrated design of the motor and the frequency converter is improved, and the integration level of equipment is improved; and the production and maintenance cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of motor equipment, and more specifically to a ventilation structure of an air-cooled permanent magnet integrated machine. Background Art

[0002] Currently, most industrial permanent magnet motors and their matching inverters on the market are installed separately. With the development of technology and market demand, permanent magnet integrated machines combining permanent magnet motors and inverters have become one of the main research and development objects of major motor companies.

[0003] Permanent magnet motors primarily offer cooling options including water, oil, and air. Water- and oil-cooled motors are not only expensive but also complex and difficult to maintain. Air-cooled permanent magnet motors offer stable performance and simplified maintenance. While their heat dissipation isn't as effective as water- and oil-cooled motors, it's possible to design an air-cooled permanent magnet motor that meets national standards and customer requirements through appropriate structural layout and simulation analysis.

[0004] Conventional air-cooled motors only need to consider the heat dissipation of the motor, while air-cooled permanent magnet integrated machines must consider not only the heat dissipation of the motor, but also the heat dissipation of the inverter core components (IGBT). Therefore, it is particularly important to design a reasonable ventilation structure. Utility Model Content

[0005] In view of this, the purpose of the present invention is to provide a ventilation structure for an air-cooled permanent magnet integrated machine. By adding a radiator to dissipate heat from the inverter, the inverter air duct is connected to the base air duct, and the same set of fans are shared to achieve synchronous heat dissipation of the motor and inverter, and help to improve the integrated design of the motor and inverter, improve the integration of the equipment, and reduce production and maintenance costs.

[0006] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0007] A ventilation structure of an air-cooled permanent magnet integrated machine, the air-cooled permanent magnet integrated machine comprising a machine base and a radiator, the radiator being used to fix a mounting assembly of an inverter, characterized in that the ventilation structure comprises:

[0008] a first air duct, arranged in contact with the machine base and used for dissipating heat from the machine base;

[0009] The second air duct is arranged in contact with the radiator and is used to dissipate heat for the radiator. The first air duct and the second air duct are connected, and the first air duct and the second air duct share the same set of fans, and the fans are used to promote air flow.

[0010] Preferably, the air-cooled permanent magnet integrated machine further comprises a casing, which simultaneously encloses the base and the radiator;

[0011] The first air duct is located between the outer wall of the base and the inner wall of the casing;

[0012] A plurality of fins are provided on the surface of the radiator, and the second air duct wraps the fins.

[0013] Preferably, the outer wall of the base is provided with a plurality of heat dissipation ribs, and the first air duct wraps the heat dissipation ribs.

[0014] Preferably, a ventilation slot plate is provided at one end of the first air duct close to the opening of the casing, the ventilation slot plate is provided with a plurality of penetrating ventilation slots, and the gaps between two adjacent groups of the heat dissipation ribs are provided corresponding to the ventilation slots.

[0015] Preferably, the fan is provided at a connecting position between the first air duct and the second air duct.

[0016] Preferably, the fan is arranged between the base and the radiator, and an end cover for sealing the inner cavity is provided at the end of the base.

[0017] Preferably, the radiator is located in the middle of the inner cavity of the casing and divides the inner cavity into two parts, and the side of the casing away from the fan is a closed cavity.

[0018] Preferably, the fan is a unidirectional rotating turbofan, and an odd number of unidirectional rotating blades are provided in the fan.

[0019] Preferably, a penetrating vent is provided on the surface of the casing corresponding to the end of the second air duct.

[0020] Preferably, a wind shield is provided between the fan and the radiator for separation, and a penetrating wind gathering hole is provided at the center of the wind shield.

[0021] The ventilation structure of the air-cooled permanent magnet integrated machine provided by the present invention has at least the following beneficial effects compared with the prior art:

[0022] 1. The base and radiator are placed in the first and second air ducts respectively, and fans are used to promote airflow, that is, active heat dissipation is adopted to ensure the heat dissipation effect;

[0023] 2. Connect the cooling air duct of the motor and the cooling air duct of the inverter, share a set of cooling fans, simplify the internal structure, and reduce production and maintenance costs;

[0024] 3. A fan is used to drive the airflow. The airflow rate is affected by the size and number of the fan blades. Therefore, to meet the heat dissipation requirements of motors with different power, the fan can be directly replaced, that is, the size and number of the fan blades can be changed to achieve different heat dissipation effects and meet the design requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0026] Figure 1 This is a schematic diagram of the explosion of the structure provided by the utility model;

[0027] Figure 2 This is a schematic diagram of the ventilation slot plate structure provided by the utility model;

[0028] Figure 3 This is a schematic diagram of the base structure provided by the utility model;

[0029] Figure 4 This is a schematic diagram of the fan structure provided by the utility model;

[0030] Figure 5 This is a schematic diagram of the windshield structure provided by the utility model;

[0031] Figure 6 This is a schematic diagram of the radiator structure provided by the utility model;

[0032] Figure 7 This is a schematic diagram of the casing structure provided by the utility model.

[0033] Figure 1-Figure 7 middle:

[0034] 1. Ventilation slot plate; 101. Ventilation slot; 2. Machine base; 201. Heat dissipation ribs; 202. First air duct; 3. Fan; 301. One-way rotating blades; 4. Wind shield; 401. Wind gathering hole; 5. Radiator; 501. Fins; 502. Second air duct; 6. Machine casing; 601. Ventilation port. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] The core of this utility model is to provide a ventilation structure for an air-cooled permanent magnet integrated machine. By adding a radiator to dissipate heat from the inverter, the inverter air duct is connected to the base air duct, and the same set of fans are shared to achieve synchronous heat dissipation of the motor and inverter, and help to improve the integrated design of the motor and inverter, improve the integration of the equipment, and reduce production and maintenance costs.

[0037] Please refer to Figure 1-Figure 7 , Figure 1 The invention relates to a ventilation structure of an air-cooled permanent magnet integrated machine, which includes a machine base 2 and a radiator 5 . The radiator 5 is used to fix the mounting assembly of the inverter. The ventilation structure includes a first air duct 202 and a second air duct 502 .

[0038] The first air duct 202 is arranged in contact with the base 2 to dissipate heat for the base 2;

[0039] The second air duct 502 is arranged in contact with the radiator 5 for dissipating heat for the radiator 5 . The first air duct 202 and the second air duct 502 are in communication, and the first air duct 202 and the second air duct 502 share the same set of fans 3 for promoting airflow.

[0040] The base 2 is used to conduct heat away from the stator and rotor, and then exchange heat with the airflow in the first air duct 202, thereby achieving a heat dissipation effect. The first air duct 202 can be arranged on the outer surface of the base 2 or through a through hole inside the base 2;

[0041] For small motors, the base 2 has a small diameter, and the first air duct 202 is mostly arranged on the outer periphery of the base 2. For large motors, the first air duct 202 can be arranged to penetrate the inner cavity of the base 2, or to dissipate heat by providing an interlayer in the base cylinder. Both of the above forms fall within the scope of protection of this application.

[0042] The radiator 5 is used to be fixed to the inverter of the motor, to conduct heat generated by the inverter, and to dissipate heat through contact with the airflow in the second air duct 502. The second air duct 502 can be arranged on the surface of the radiator 5 or as a channel that penetrates the radiator 5. Both forms shall be within the scope of protection of this application.

[0043] The function of the fan 3 is to drive the air flow through the first air duct 202 and the second air duct 502 for heat exchange. It is worth noting that the type and layout position of the fan 3 are not restricted here. For example, if an axial fan, a centrifugal fan, etc. is used and arranged at any end of the first air duct 202 or any end of the second air duct 502, it should fall within the scope of protection of this application.

[0044] In some embodiments, the air-cooled permanent magnet integrated machine further includes a housing 6 , which simultaneously encloses the base 2 and the radiator 5 ;

[0045] The first air duct 202 is located between the outer wall of the base 2 and the inner wall of the housing 6. The first air duct 202 can be arranged in various forms, such as along the axis of the base 2 or in a spiral arrangement on the outer wall of the base 2. The purpose of the different arrangements of the first air duct 202 is to make the cold air flow flow from one end of the outer wall of the base 2 to the other end, thereby contacting and exchanging heat with the outer wall of the base 2 and removing heat from the surface of the base 2.

[0046] The surface of the radiator 5 is provided with a plurality of fins 501, and the second air duct 502 wraps the fins 501;

[0047] For an all-in-one machine, the integrity of its surface is of vital importance. Using a casing 6 to wrap the base 2 and the radiator 5 helps to improve the overall integrity of the equipment and enhance its aesthetics. It also limits the first air duct 202 to be located on the periphery of the base 2, that is, in the gap between the base 2 and the casing 6. At the same time, the second air duct 502 is limited to the gap between the fins 501 on the surface of the radiator 5. Compared with other air duct arrangements, in this example, the base 2 and the radiator 5 have the advantages of simple structure and easy processing.

[0048] However, in other embodiments, the outer wall of the base 2 is provided with a plurality of heat dissipation ribs 201, the heat dissipation ribs 201 are arranged along the axis direction of the base 2, and the first air duct 202 wraps the heat dissipation ribs 201; that is, the heat dissipation ribs 201 are provided on the outside of the base 2, and the heat dissipation ribs 201 can be made of an aluminum alloy formed by stretching integrally with the base 2, such as Figure 3 As shown, it can also be a thin plate welded to the outer periphery of the base 2 at a later stage, the purpose of which is to increase the heat dissipation area outside the base 2, increase the heat exchange contact area between the base 2 and the air flow in the first air duct 202, improve the heat exchange efficiency, further increase the heat extraction speed inside the base 2, and improve the heat dissipation effect at the stator and rotor position of the motor.

[0049] In some embodiments, both ends of the first air duct 202 are open, which helps reduce the flow resistance of the airflow in the air duct and reduces the noise generated by the airflow. However, this design loses the sealing performance of the housing 6. Once foreign matter enters the first air duct 202, it will block the airflow and affect the heat dissipation effect.

[0050] Therefore, in this embodiment, a ventilation slot plate 1 is provided at one end of the first air duct 202 close to the opening of the housing 6. The ventilation slot plate 1 is provided with a plurality of ventilation slots 101 extending therethrough. The gaps between two adjacent groups of heat dissipation ribs 201 are provided corresponding to the ventilation slots 101.

[0051] like Figure 1 and Figure 2As shown, a ventilation slot plate 1 is added to the open end of the casing 6, and a ventilation slot 101 corresponding to the gap between the heat dissipation rib 201 is provided on the ventilation slot plate 1. When the airflow flows through the ventilation slot plate 1, the resistance is small, and the end of the casing 6 can be shielded to prevent foreign matter from entering and blocking the air duct.

[0052] Of course, it is still feasible to respectively set the same ventilation slot plate 1 at both ends of the base 2, but the possibility of foreign matter entering the end of the base 2 inside the casing 6 is smaller, so the ventilation slot plate 1 can be appropriately reduced to reduce the weight.

[0053] In some embodiments, the fan 3 is disposed at the connecting position between the first air duct 202 and the second air duct 502, and simultaneously drives the air flow in the first air duct 202 and the second air duct 502, which helps to ensure the balance of wind pressure in the two sets of air ducts. Placing the fan 3 in the middle position of the housing 6 helps to reduce the power loss of airflow transmitted in the air duct, and helps to reduce noise transmission, thereby improving the quietness of the device.

[0054] In other embodiments, the fan 3 is arranged at the end of the overall air duct composed of the first air duct 202 and the second air duct 502, and gas exchange is performed in a positive pressure or negative pressure manner in the overall air duct, which can also achieve synchronous heat dissipation of the motor and the inverter.

[0055] When in use, the fan 3 is connected to the rotor of the motor. When the motor rotates, it drives the fan 3 to rotate synchronously, serving as a power source for heat dissipation in the air duct. It is worth noting that the direction of the airflow is not limited here.

[0056] When the fan 3 is arranged at one end of the first air duct 202 away from the second air duct 502, that is, when it is installed at the opening position of the casing 6, when the cold air flow enters from the vent 601, the interior of the casing 6 is in a negative pressure state as a whole. When the cold air flow enters from the open end of the casing 6, the interior of the casing 6 is in a positive pressure state. Both methods can meet the heat dissipation requirements of the equipment.

[0057] At the same time, the fixing method of the base 2, the radiator 5 and the casing 6 is not limited, and bolt connection, riveting, etc. are preferred, but other connection methods should be within the scope of protection of this application.

[0058] At the same time, the arrangement of the radiator 5 is not limited here. That is to say, as long as the radiator 5 for heat dissipation of the inverter is placed inside the casing 6, regardless of whether the directions of the first air duct 202 and the second air duct 502 are consistent, as long as the two can be arranged to be interconnected, they all fall within the scope of protection of this application.

[0059] Here, the heat dissipation method of the base 2 is not limited. In some embodiments, the thermal conductivity of the base 2 itself is directly used to transfer internal heat to the outer wall. For example, the base 2 is made of aluminum alloy to improve the thermal conductivity.

[0060] In motor design, for some larger motors, a built-in fan is used to dissipate heat from the stator and rotor, that is, the stator and rotor are directly exposed to the air duct. At this time, dust particles in the airflow directly contact them, causing dust to accumulate at the rotating position, affecting the smoothness of rotation. Therefore, for small-sized motors, their stators and rotors directly rely on the thermal conductivity of the base 2 for heat dissipation, and the internal heat is discharged through the base 2, and the external fan 3 is used for heat dissipation, that is, the fan 3 is arranged outside the base 2.

[0061] like Figure 1 As shown, the fan 3 is arranged between the base 2 and the radiator 5. An end cover for sealing the inner cavity is provided at the end of the base 2. By adding the end cover, the sealing inside the base 2 is improved, and the objects carried in the air flow in the air duct are prevented from affecting the smoothness of the motor's rotation.

[0062] In some embodiments, the fan 3 is an axial flow fan. When the heat dissipation airflow passes through the fan 3, it is parallel to the axis. The airflow is affected by the direction of the internal air duct and adaptively changes direction. It collides with the inner wall of the housing 6 multiple times, making it difficult to suppress noise and vibration.

[0063] Therefore, in other embodiments, such as Figure 4 As shown, the fan 3 is a unidirectional rotating turbofan, and an odd number of unidirectional rotating blades 301 are provided inside the fan 3;

[0064] By using a turbofan, the airflow changes direction when passing through the fan 3, adapting to the air duct design in the casing 6, reducing noise and vibration. At the same time, using an odd number of unidirectional rotating blades 301 helps to reduce the vibration and noise of the fan 3 itself when it rotates.

[0065] At the same time, the radiator 5 is located in the middle of the inner cavity of the casing 6 and divides the inner cavity into two parts. The side of the casing 6 away from the fan 3 is a closed cavity. At this time, the plane of the radiator 5 is perpendicular to the axis of the fan 3, that is, the second air duct 502 is perpendicular to the first air duct 202, the vent 601 is on the side wall surface of the casing 6, and the air inlet end of the fan 3 is located in the center. That is, the cold airflow entering through the vent 601 can obtain a larger contact area with the fins 501 of the radiator 5, that is, the fins 501 in the center area of ​​the radiator 5 can also contact the cold airflow, which has the purpose of improving the heat dissipation effect of the radiator 5.

[0066] At the same time, the radiator 5 cuts off the inner cavity of the casing 6, making the rear end of the casing 6 an independent inner cavity. Placing the inverter in the independent inner cavity helps to improve the sealing of the electrical component compartment, avoid the influence of dust on the electrical components, and enable the all-in-one machine to be used in harsh working conditions. When installing the inverter, its heating surface should be close to the installation surface of the radiator 5. If necessary, thermal grease should be applied between the two to better transfer the heat generated by the inverter.

[0067] Therefore, a penetrating vent 601 is provided on the surface of the casing 6 corresponding to the end of the second air duct 502 to solve the problem of blocked air duct caused by the radiator 5 blocking the inner cavity of the casing 6 , that is, air enters from the side of the casing 6 .

[0068] In other embodiments, a radiator 5 having a structure similar to that of the base 2 is used, the inverter is arranged inside the radiator 5, the fins 501 are arranged on the outer surface of the radiator 5, and the radiator 5 is placed in the casing 6, which can also achieve the effect of the first air duct 202 and the second air duct 502 sharing the fan 3, and also falls within the scope of protection of this application.

[0069] In order to further increase the effective length of the second air duct 502, that is, the residence time of the cold air flow in the gap between the fins 501, and the heat exchange area of ​​the radiator 5, in some embodiments, as shown in FIG. Figure 5 As shown, a windshield 4 is provided between the fan 3 and the radiator 5 for separation. A penetrating air collection hole 401 is provided at the center of the windshield 4. The design of the windshield 4 forcibly changes the trajectory of the cold air flow so that it fully contacts the fins 501, solving the problem of slow heat volatilization at the center of the radiator 5.

[0070] like Figure 6 and Figure 7 As shown, the heat sink 5 is preferably made of stretched aluminum alloy, and the fins 501 on its surface can be arranged in various ways, such as multiple groups of fins 501 arranged in parallel or in an array, and vents 601 are provided on the surface of the housing 6 corresponding to the ends thereof, that is, the housing 6 is only provided with vents 601 on two sides thereof.

[0071] Alternatively, the fins 501 are arranged in a cross-shaped divergent arrangement and converge at the center of the radiator 5 at the middle position, that is, the ends of the second air duct 502 correspond to the four sides of the casing 6 respectively, that is, the four sides are provided with vents 601, so that a larger amount of cold air intake can be obtained, further improving the heat dissipation effect.

[0072] After adopting the fan 3 of the turbofan, the cold air flow diffuses from axial flow to radial flow when passing through the fan 3, and then passes through the first air duct 202 to exchange heat with the surface of the base 2. During this process, the impact of the air flow on the rear end cover of the base 2 is reduced, the noise and vibration of the all-in-one machine are reduced, and the heat dissipation effect is ensured.

[0073] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0074] The ventilation structure of the air-cooled permanent magnet integrated machine provided by the present invention is introduced in detail above. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core ideas of the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified in a number of ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A ventilation structure of an air-cooled permanent magnet integrated machine, the air-cooled permanent magnet integrated machine comprising a machine base (2) and a radiator (5), the radiator (5) being used to fix a mounting assembly of a frequency converter, characterized in that: The ventilation structure comprises: A first air duct (202) is arranged in contact with the machine base (2) and is used to dissipate heat for the machine base (2); The second air duct (502) is arranged in contact with the radiator (5) and is used to dissipate heat for the radiator (5); the first air duct (202) and the second air duct (502) are connected, and the first air duct (202) and the second air duct (502) share the same set of fans (3), and the fans (3) are used to promote airflow.

2. The ventilation structure of the air-cooled permanent magnet integrated machine according to claim 1 is characterized in that: The air-cooled permanent magnet integrated machine also includes a casing (6), and the casing (6) simultaneously wraps the base (2) and the radiator (5); The first air duct (202) is located between the outer wall of the base (2) and the inner wall of the housing (6); A plurality of groups of fins (501) are provided on the surface of the radiator (5), and the second air duct (502) wraps around the fins (501).

3. The ventilation structure of the air-cooled permanent magnet integrated machine according to claim 2 is characterized in that: The outer wall of the machine base (2) is provided with a plurality of groups of heat dissipation ribs (201), and the first air duct (202) wraps around the heat dissipation ribs (201).

4. The ventilation structure of the air-cooled permanent magnet integrated machine according to claim 3 is characterized in that: A ventilation slot plate (1) is provided at one end of the first air duct (202) close to the opening of the housing (6); the ventilation slot plate (1) is provided with a plurality of penetrating ventilation slots (101); and the gap between two adjacent groups of heat dissipation ribs (201) is arranged corresponding to the ventilation slots (101).

5. The ventilation structure of the air-cooled permanent magnet integrated machine according to claim 4, characterized in that: The fan (3) is arranged at a connecting position between the first air duct (202) and the second air duct (502).

6. The ventilation structure of the air-cooled permanent magnet integrated machine according to claim 5, characterized in that: The fan (3) is arranged between the machine base (2) and the radiator (5), and an end cover for sealing the inner cavity is provided at the end of the machine base (2).

7. The ventilation structure of the air-cooled permanent magnet integrated machine according to claim 6, characterized in that: The radiator (5) is located in the middle of the inner cavity of the casing (6) and divides the inner cavity into two parts. The side of the casing (6) away from the fan (3) is a closed cavity.

8. The ventilation structure of the air-cooled permanent magnet integrated machine according to claim 7, characterized in that: The fan (3) is a unidirectionally rotating turbofan, and an odd number of unidirectionally rotating blades (301) are arranged inside the fan (3).

9. The ventilation structure of the air-cooled permanent magnet integrated machine according to claim 8, characterized in that: A through ventilating opening (601) is provided on the surface of the housing (6) corresponding to the end of the second air duct (502).

10. The ventilation structure of the air-cooled permanent magnet integrated machine according to any one of claims 7 to 9, characterized in that: A wind shield (4) for separation is provided between the fan (3) and the radiator (5), and a penetrating wind gathering hole (401) is provided at the center of the wind shield (4).

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