Fan

Abstract

The utility model relates to the technical field of ventilation equipment, in particular to a fan. The impeller comprises a permanent magnet synchronous motor and a plurality of blades, the permanent magnet synchronous motor comprises a machine base, a supporting shaft, a stator and a rotor, the supporting shaft is fixedly connected with the machine base, the stator is arranged on the periphery of the supporting shaft in a sleeving mode and fixedly connected with the supporting shaft, and the rotor is arranged on the periphery of the stator in a sleeving mode and rotationally connected with the supporting shaft. The stator comprises a winding; the rotor comprises a permanent magnet group; the multiple blades are distributed around the axis of the supporting shaft at intervals, and each blade is fixedly connected with the peripheral side wall of the rotor. When the permanent magnet synchronous motor works, the rotor and the rotating magnetic field rotate synchronously, so that the permanent magnet synchronous motor can still have high working efficiency under the condition of low load, in addition, permanent magnet synchronization avoids the condition that induction current in a rotor winding is increased under the condition of low load, magnetic hysteresis loss is reduced, rotor copper loss is eliminated, and the service life of the permanent magnet synchronous motor is prolonged. Therefore, the utilization rate of electric energy is improved.

Description

Technical Field

[0001] This utility model relates to the field of ventilation equipment technology, and in particular to a fan. Background Technology

[0002] Ventilation systems are the lifeblood of a mine, the cornerstone of safe production. With continuous advancements in mining technology, the production efficiency of fully mechanized mining faces has significantly increased, leading to a growing demand for ventilation. Ventilation systems play a crucial role in mines; good ventilation effectively removes harmful gases and dust, creating a safe working environment for miners, reducing the risk of accidents, and playing an indispensable role in ensuring normal mine production and personnel safety. In the event of mine disasters such as gas explosions, coal dust explosions, fires, and coal and gas outbursts, ventilation systems also play a key role in curbing the escalation of accidents and assisting in emergency response.

[0003] Ventilation fans are commonly used ventilation equipment in mines. The air volume of the fans needs to change with the production capacity of the mine. Fans are generally driven by asynchronous motors. Asynchronous motors can only have high working efficiency under high load conditions. When the asynchronous motor is under low load conditions, the working efficiency of the asynchronous motor will drop sharply, resulting in a lot of energy waste. Utility Model Content

[0004] In view of this, the present invention provides a fan to solve the problem that when the asynchronous motor is under low load, the working efficiency of the asynchronous motor will drop sharply, resulting in a large amount of wasted electrical energy.

[0005] This application provides a fan, comprising:

[0006] A permanent magnet synchronous motor includes a frame, a support shaft, a stator, and a rotor. The support shaft is fixedly connected to the frame. The stator is sleeved on the outer periphery of the support shaft and fixedly connected to the support shaft. The rotor is sleeved on the outer periphery of the stator and rotatably connected to the support shaft. The stator includes windings, and the rotor includes a permanent magnet assembly.

[0007] Multiple blades are spaced apart around the axis of the support shaft, and each blade is fixedly connected to the outer peripheral sidewall of the rotor.

[0008] Beneficial effects: After the permanent magnet synchronous motor (PMSM) starts working, the stator (windings) generates a rotating magnetic field. Under the influence of this rotating magnetic field, the rotor (permanent magnet assembly) rotates synchronously with it. This avoids the situation where, under low load, the difference between the rotor speed and the magnetic field speed in an asynchronous motor increases, leading to an increase in induced current in the rotor windings and the generation of a large amount of heat. Furthermore, compared to asynchronous motors, PMSMs reduce hysteresis losses. Additionally, PMSMs establish a fixed magnetic field directly through the rotor, eliminating the need to apply current to the rotor and thus eliminating rotor copper losses. Because the rotor rotates synchronously with the rotating magnetic field during operation, PMSMs maintain high efficiency even under low load conditions. Moreover, PMSMs avoid increased induced current in the rotor windings under low load, reduce hysteresis losses, and eliminate rotor copper losses, thereby improving energy utilization and reducing energy waste.

[0009] In one alternative embodiment, the base has an open recess;

[0010] At least a portion of the rotor is located outside the opening groove, and each blade is fixedly connected to the outer peripheral sidewall of the rotor located outside the opening groove;

[0011] At least a portion of the stator is located within the opening groove.

[0012] Beneficial effects: At least part of the rotor is exposed to the outside, which improves the efficiency of heat dissipation of the rotor. In addition, the heat on the stator can also be quickly dissipated through the rotor exposed to the outside. Furthermore, the heat generated by the stator can also be quickly dissipated through the part in contact with the outside, thereby improving the heat dissipation efficiency of the fan and avoiding the accumulation of heat in the opening groove. This allows the fan to operate at the rated temperature, thereby increasing the service life of the fan.

[0013] In one alternative embodiment, a first channel is provided on the support shaft, one end of the first channel is connected to the outside, and the other end of the first channel is connected to the opening groove. The stator includes a power supply line, which passes through the first channel and is connected to an external power supply device.

[0014] Beneficial effects: The first channel shell protects the internal power supply lines, extending the time before they age or fail due to insulation failure. Heat generated by the power supply lines can also be quickly dissipated by the support shaft, preventing heat accumulation within the lines and further extending the time before aging or insulation failure. Furthermore, the first channel forms an electromagnetic shielding layer, reducing the impact of external electromagnetic interference on the power supply lines. Additionally, the power supply lines connect to external power equipment through the first channel, facilitating the laying and connection of power lines, ensuring normal power supply to the motor, and avoiding the risk of messy and damaged wiring.

[0015] In one optional embodiment, the base is provided with a second channel, one end of which is connected to the outside, and the other end of which is connected to the end of the first channel away from the opening groove. The power supply line passes through the first channel and the second channel in sequence and then connects to the external power supply equipment.

[0016] Beneficial effects: The power supply line of the permanent magnet synchronous motor can be connected to the external power supply equipment in sequence through the first channel and the second channel to provide stable power supply to the permanent magnet synchronous motor and ensure the normal operation of the fan; both the first channel and the second channel can protect the power supply line inside, increasing the length of the protected power supply line, thereby reducing the length of the power supply line that needs to be frequently maintained in the future, thus reducing maintenance costs.

[0017] In one optional embodiment, a third channel is provided on the stator, one end of the third channel is connected to the end of the second channel away from the first channel, and the other end of the third channel is connected to the opening groove;

[0018] The power supply line passes through the third channel, the first channel, and the second channel in sequence before connecting to the external power supply equipment.

[0019] Beneficial effects: The power supply line connects to external power supply equipment sequentially through the third, first, and second channels, providing a stable power supply to the permanent magnet synchronous motor. Furthermore, the increased length of the protected power supply line further reduces the length of subsequent power supply lines requiring frequent maintenance, thereby further reducing maintenance costs.

[0020] In one alternative embodiment, the stator includes:

[0021] The stator core is sleeved on the outer circumference of the support shaft and is fixedly connected to the support shaft by a key;

[0022] The winding is wound on the stator core.

[0023] In one alternative embodiment, the rotor includes:

[0024] The rotor core is sleeved on the outer periphery of the stator;

[0025] The first cover is sleeved on the outer periphery of the support shaft and is fixedly connected to the rotor core;

[0026] The second cover is sleeved on the outer periphery of the support shaft and fixedly connected to the rotor core, and is disposed opposite to the first cover;

[0027] The permanent magnet assembly includes multiple permanent magnets, which are spaced apart around the axis of the support shaft and located between the stator and the rotor core, and are spaced apart from the stator. Each permanent magnet is fixedly connected to the rotor core.

[0028] Beneficial effects: The rotor of the permanent magnet synchronous motor consists of a rotor core, a first cover, a second cover, and multiple permanent magnets. This allows the fan to have the characteristics of direct drive by an external permanent magnet rotor. The external rotor is directly connected to the blades, effectively reducing the number of transmission components between the permanent magnet synchronous motor and the blades, thereby reducing energy loss in driving the blades. The permanent magnets are spaced apart between the stator and the rotor core around the support shaft axis. When the rotor core rotates, it is subjected to centrifugal force, and each permanent magnet can fit tightly against the rotor core without the need for reinforcement. Compared with the internal rotor structure, the external rotor structure makes it easier to install multiple magnetic poles, reducing the stator volume and lowering costs while ensuring high efficiency.

[0029] In one alternative embodiment, both the first cover and the second cover are rotatably connected to the support shaft via bearings.

[0030] Beneficial effects: This allows the rotor to rotate around the support shaft in a more stable and smooth manner, thereby ensuring the reliability and stability of the fan during operation; this connection method reduces friction and failures during operation, and lowers maintenance costs; at the same time, because the rotor rotates smoothly, it helps to further leverage the fan's high efficiency and energy-saving advantages, and improve the overall operating efficiency and performance of the fan.

[0031] In one alternative embodiment, a support frame is also included, which is fixedly connected to the base.

[0032] Beneficial effects: The addition of a support frame that is fixedly connected to the base can support and fix the fan, improving the overall stability and reliability of the fan.

[0033] In summary, this application includes at least one of the following beneficial technical effects:

[0034] 1. The use of a permanent magnet synchronous motor as the drive unit improves the efficiency of the entire transmission system, reduces the failure of connecting components during operation, lowers maintenance costs, and improves the reliability and stability of the fan during operation;

[0035] 2. Permanent magnet synchronous motors can maintain high efficiency and power factor, and have a wide high-efficiency operating range, which can effectively improve equipment operating efficiency;

[0036] 3. External rotor motors expose the rotor directly to the air, which is beneficial for heat dissipation. Attached Figure Description

[0037] Figure 1This is a cross-sectional view of the permanent magnet motor external rotor structure fan of this utility model;

[0038] Figure 2 This is a cross-sectional view of the stator core and support shaft in this utility model;

[0039] Figure 3 This is a cross-sectional view of the rotor core, the first cover, and the second cover in this utility model.

[0040] Explanation of reference numerals in the attached figures:

[0041] 101. Frame; 1011. Opening groove; 1012. Second channel; 102. Support shaft; 1021. First channel; 103. Stator; 1031. Third channel; 1032. Stator core; 104. Rotor; 1041. Rotor core; 1042. First cover; 1043. Second cover; 105. Bearing;

[0042] 200. Support frame. Detailed Implementation

[0043] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0044] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0045] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0046] Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0047] This application discloses a fan, such as... Figures 1 to 3 As shown, the fan includes a permanent magnet synchronous motor and multiple blades. The permanent magnet synchronous motor includes a frame 101, a support shaft 102, a stator 103, and a rotor 104. The support shaft 102 is fixedly connected to the frame 101. The stator 103 is fitted around the outer periphery of the support shaft 102 and fixed to it. The rotor 104 is fitted around the outer periphery of the stator 103 and rotatably connected to the support shaft 102. Multiple blades are spaced apart around the axis of the support shaft 102, and each blade is fixedly connected to the outer peripheral sidewall of the rotor 104. This allows the permanent magnet synchronous motor to directly drive the blades to rotate, reducing intermediate transmission components, lowering energy loss, and improving the efficiency of the fan. Specifically, the frame 101 is the basic support component of the entire fan. The frame 101 can be made of steel, copper, iron, or other metals or alloys. In this embodiment, the frame 101 is made of cast iron, which has good rigidity and stability and can withstand the vibrations generated during motor operation. The shape of the base 101 can be designed according to actual installation and usage requirements, and can be square, circular, or other common shapes. In this embodiment, the base 101 includes a cylinder, a partition, and reinforcing ribs. The partition is located in the cylinder and is fixedly connected to the inner wall of the cylinder or integrally formed. Several reinforcing ribs are distributed on one side surface of the partition, and the reinforcing ribs are spaced apart on one side surface of the partition, such as... Figure 1 As shown from the perspective, several reinforcing ribs are provided on the right side of the partition. The support shaft plays a crucial role in supporting the stator 103 and rotor 104. The support shaft 102 is generally made of high-quality alloy steel to ensure sufficient strength and toughness. The surface of the support shaft 102 is usually precision machined to ensure its smoothness and precision, reducing friction and wear with other components. The support shaft 102 is fixedly connected to the base, and the fixed connection can be welding, riveting, snap-fitting, or bolting. Specifically, one end of the support shaft 102 passes through the partition and is welded to the partition. The fixed connection between the support shaft 102 and the stator 103 is a sleeve-type connection, and to ensure the stability of the connection, it can be achieved through a key connection. The key connection can effectively transmit torque and prevent the stator 103 from rotating during operation.

[0048] The fan provided in this embodiment, such as Figure 2As shown, the stator 103 includes a stator core 1032 and windings. The stator core 1032 is sleeved on the outer periphery of the support shaft 102 and is fixedly connected to the support shaft 102 by a key. The stator core 1032 is typically made of laminated silicon steel sheets. Silicon steel sheets have good magnetic permeability, which can reduce eddy current losses during motor operation. The stator core 1032 is cylindrical in shape, and its inner wall fits tightly against the support shaft 102. The windings are wound on the stator core 1032 and are made of copper wire. Copper has good conductivity and can effectively conduct current. The winding method and number of turns are designed according to the power and performance requirements of the permanent magnet synchronous motor.

[0049] The fan provided in this embodiment, such as Figure 3 As shown, the rotor 104 includes a rotor core 1041, a first cover 1042, a second cover 1043, and a permanent magnet assembly. The rotor core 1041 is sleeved on the outer periphery of the stator 103 and is made of laminated silicon steel sheets to improve magnetic permeability and reduce eddy current losses. The first cover 1042 and the second cover 1043 are both sleeved on the outer periphery of the support shaft 102 and are fixedly connected to the rotor core 1041, and are arranged opposite to each other. The first cover 1042 and the second cover 1043 are typically made of aluminum alloy, which is lightweight and high-strength, reducing the weight of the rotor 104 and improving the motor's operating efficiency. The first cover 1042 and the second cover 1043 are rotatably connected to the support shaft 102 via bearings 105. The bearings 105 can be rolling bearings, which have the advantages of low friction coefficient and smooth operation. The permanent magnet assembly comprises multiple permanent magnets, which are spaced apart around the axis of the support shaft 102 and located between the stator 103 and the rotor core 1041, and spaced apart from the stator 103. Each permanent magnet is fixedly connected to the rotor core 1041. The permanent magnets are generally made of permanent magnet materials, such as neodymium iron boron permanent magnets, which have high remanence and coercivity, providing a strong magnetic field. Multiple blades are spaced apart around the axis of the support shaft 102, and each blade is fixedly connected to the outer peripheral wall of the rotor 104. The blades are typically made of lightweight, high-strength composite materials, such as carbon fiber composites, which ensure both strength and rigidity while reducing weight. The shape and number of blades are designed according to the fan's airflow and pressure requirements. The blades are connected to the rotor 104 by bolts or welding to ensure a secure connection.

[0050] The implementation principle of this embodiment is as follows: the blades are directly driven to rotate by a permanent magnet synchronous motor, avoiding energy loss and noise problems caused by intermediate transmission components. Permanent magnet synchronous motors have high efficiency and power factor, consuming less electrical energy under the same load, thus achieving energy saving. At the same time, permanent magnet synchronous motors have good operational stability, reducing equipment failure rate and maintenance costs. Furthermore, the direct connection between the blades and rotor 104 makes the fan structure more compact, improving the overall performance and reliability of the fan. Compared with traditional asynchronous motor-driven fans, this has significant advantages and can better meet the ventilation needs of mines.

[0051] like Figure 1 As shown, this embodiment provides a fan. The base 101 has an opening groove 1011, which is the space on the left side of the partition. At least a portion of the rotor 104 is located outside the opening groove 1011, and each blade is fixedly connected to the outer peripheral sidewall of the portion of the rotor 104 located outside the opening groove 1011. At least a portion of the stator 103 is located inside the opening groove 1011. The opening groove 1011 of the base 101 provides a specific spatial structure for the installation of the stator 103 and the rotor 104. The design of the opening groove 1011 can make the motor layout more reasonable, which is beneficial to the heat dissipation and protection of the motor. The shape and size of the opening groove 1011 are designed according to the specific structure and performance requirements of the motor. The inner diameter of the opening groove 1011 is larger than the outer diameter of the stator 103 so that the stator 103 can be smoothly installed in the groove. At least a portion of the rotor 104 is placed outside the opening groove 1011, so that the blades are fixedly connected to the outer peripheral sidewall of the portion of the rotor 104 located outside the opening groove 1011. Meanwhile, the portion of the stator 103 located within the opening groove 1011 receives better protection, reducing the impact of external dust, moisture, and other factors on the stator 103. The design of the opening groove 1011 in the frame 101 optimizes the structural layout of the fan, ensuring the normal operation of the blades while improving the protective performance of the stator 103. By rationally allocating the positions of the stator 103 and rotor 104 within and outside the opening groove 1011, the fan operates more stably and reliably, reducing damage to internal components from external factors, extending the motor's service life, and further improving the overall performance and reliability of the fan.

[0052] like Figure 1 As shown, the fan provided in this embodiment has several heat dissipation holes on the base 101. The heat dissipation holes allow the heat in the first groove to dissipate quickly, improving the heat dissipation efficiency of the stator 103 and ensuring that the fan can work normally.

[0053] like Figure 1 and Figure 2As shown, the fan provided in this embodiment has a first channel 1021 on the support shaft 102. One end of the first channel 1021 is connected to the outside, and the other end is connected to the opening groove 1011. The stator 103 includes power supply lines, which pass through the first channel 1021 and connect to external power supply equipment. The power supply lines are used to transmit electrical energy to the windings. The first channel 1021 protects the power supply lines inside, extending the time before the power supply lines age or fail in insulation. The heat generated by the power supply lines can also be quickly dissipated by the support shaft 102, preventing heat accumulation in the power supply lines and further extending the time before the power supply lines age or fail in insulation. In addition, the first channel 1021 can form an electromagnetic shielding layer, reducing the impact of external electromagnetic interference on the power supply lines. Furthermore, the connection of the power supply lines to external power supply equipment through the first channel 1021 facilitates the laying and connection of the power supply lines, ensures normal power supply to the motor, and avoids the risk of messy and damaged wiring.

[0054] like Figure 1 As shown, the fan provided in this embodiment has a second channel 1012 on the base 101. One end of the second channel 1012 is connected to the outside, and the other end of the second channel 1012 is connected to the end of the first channel 1021 away from the opening groove 1011. The power supply line passes through the first channel 1021 and the second channel 1012 in sequence before connecting to the external power supply equipment. The power supply line of the permanent magnet synchronous motor can be connected to the external power supply equipment in sequence through the first channel 1021 and the second channel 1012 to provide stable power supply to the permanent magnet synchronous motor and ensure the normal operation of the fan. Both the first channel 1021 and the second channel 1012 can protect the power supply lines within them, increasing the length of the protected power supply lines and thus reducing the length of the power supply lines that need to be frequently maintained, thereby reducing maintenance costs.

[0055] like Figure 1 and Figure 2 As shown, the fan provided in this embodiment has a third channel 1031 on the stator 103. One end of the third channel 1031 is connected to the end of the second channel 1012 away from the first channel 1021, and the other end of the third channel 1031 is connected to the opening groove 1011. The power supply line passes through the third channel 1031, the first channel 1021, and the second channel 1012 in sequence before connecting to the external power supply equipment. The power supply line passes through the third channel 1031, the first channel 1021, and the second channel 1012 in sequence before connecting to the external power supply equipment, providing stable power supply to the permanent magnet synchronous motor. Furthermore, the length of the protected power supply line is increased, thereby further reducing the length of the power supply line that needs frequent maintenance, and thus further reducing maintenance costs.

[0056] like Figure 1As shown, the fan provided in this embodiment also includes a support frame 200. Multiple support frames 200 are provided, and multiple support frames 200 are arranged around the outer periphery of the base 101 and welded and fixed to the outer periphery side wall of the base 101. In this embodiment, the number of support frames 200 is three. The support frames 200 are used to fix and connect to the wall or the base. The addition of support frames 200 fixedly connected to the base 101 can support and fix the fan, and improve the overall stability and reliability of the fan.

[0057] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A fan, characterized by, include: A permanent magnet synchronous motor includes a frame (101), a support shaft (102), a stator (103), and a rotor (104). The support shaft (102) is fixedly connected to the frame (101). The stator (103) is sleeved on the outer periphery of the support shaft (102) and fixedly connected to the support shaft (102). The rotor (104) is sleeved on the outer periphery of the stator (103) and rotatably connected to the support shaft (102). The stator (103) includes windings, and the rotor (104) includes a permanent magnet assembly. Multiple blades are spaced apart around the axis of the support shaft (102), and each blade is fixedly connected to the outer peripheral sidewall of the rotor (104).

2. The fan of claim 1, wherein The base (101) has an open groove (1011). At least a portion of the rotor (104) is located outside the opening groove (1011), and each blade is fixedly connected to the outer peripheral sidewall of the portion of the rotor (104) located outside the opening groove (1011); At least a portion of the stator (103) is located within the opening groove (1011).

3. The fan of claim 2, wherein, The support shaft (102) has a first channel (1021) with one end connected to the outside and the other end connected to the opening groove (1011). The stator (103) includes a power supply line, which passes through the first channel (1021) and is connected to an external power supply device.

4. The fan of claim 3, wherein, The base (101) is provided with a second channel (1012). One end of the second channel (1012) is connected to the outside, and the other end of the second channel (1012) is connected to the end of the first channel away from the opening groove (1011). The power supply line passes through the first channel (1021) and the second channel (1012) in sequence and then connects to the power supply equipment in the outside.

5. The fan of claim 4, wherein, The stator (103) has a third channel (1031), one end of the third channel (1031) is connected to the end of the second channel (1012) away from the first channel (1021), and the other end of the third channel (1031) is connected to the opening groove (1011); The power supply line passes through the third channel (1031), the first channel (1021), and the second channel (1012) in sequence before connecting to the external power supply equipment.

6. The fan of any one of claims 1-5, wherein, The stator (103) includes: The stator core (1032) is sleeved on the outer periphery of the support shaft (102) and fixedly connected to the support shaft (102) by a key; The winding is wound on the stator core (1032).

7. The fan of any one of claims 1-5, wherein, The rotor (104) includes: The rotor core (1041) is sleeved on the outer periphery of the stator (103); The first cover (1042) is sleeved on the outer periphery of the support shaft (102) and fixedly connected to the rotor core (1041); The second cover (1043) is sleeved on the outer periphery of the support shaft (102) and fixedly connected to the rotor core (1041), and is disposed opposite to the first cover (1042); The permanent magnet assembly includes multiple permanent magnets, which are distributed at intervals around the axis of the support shaft (102) and located between the stator (103) and the rotor core (1041), and are spaced apart from the stator (103). Each permanent magnet is fixedly connected to the rotor core (1041).

8. The fan according to claim 7, characterized in that, Both the first cover (1042) and the second cover (1043) are rotatably connected to the support shaft (102) via bearings (105).

9. The fan of claim 1, wherein It also includes a support frame (200) which is fixedly connected to the base (101).

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