TWI675966B - Axial-flow blower - Google Patents

Abstract

The invention relates to an axial flow fan, which includes a body, a motor base, a brushless motor, a fan assembly, a control box and a heat dissipation structure. The bottom of the control box is fixed on the outside of the body. The control box is provided with a control module and a driving circuit board which are electrically connected to each other. The heat dissipation structure passes through the control box and is in contact with the driving circuit board and is exposed outside the control box.

Description

Axial fan

The invention relates to an axial flow fan.

According to general fans are widely used in domestic electric fans, office air-conditioning systems and factory equipment. The motors of the fans have brush type and brushless type. Among them, the brushless motor has low heat loss and high mechanical energy conversion efficiency. And as the electronic control technology that controls the drive circuit board of the brushless motor is more and more developed, the brushless motor can reach the characteristics of high wattage and is not easy to generate heat. Therefore, the brushless motor has gradually become a trend in fan applications. More and more high-wattage (such as 100 watts to 500 watts) brushless motor fans appear on the market for large factories and event venues.

However, this type of conventional brushless motor fan has the following disadvantages. Although a high wattage brushless motor may have a lower heating rate than a higher wattage brushed motor, increasing the wattage is accompanied by a driving circuit. The current passed by the board will be larger and larger, so it is easy to cause the conventional brushless motor fan to use in high wattage, the driving circuit board will overheat and cause heat to be burnt, and in more serious cases may cause a fire. There are shortcomings that need to be improved.

Therefore, it is necessary to provide a novel and progressive axial flow fan to solve the above problems.

The main object of the present invention is to provide an axial flow fan, which can effectively make the brushless motor in a high-wattage state, and the driving circuit board for controlling the rotation of the brushless motor can effectively dissipate heat without causing temperature. It is too high to prevent the drive circuit board from generating heat or burning. Therefore, the axial flow fan of the present invention can have higher durability and safety.

To achieve the above object, the present invention provides an axial flow fan, which includes a body, a motor base, a brushless motor, a fan assembly, a control box, and a heat dissipation structure. The machine body is provided with an axially extending air duct, one end of the air duct is provided with an air inlet, and the other end is provided with an air outlet. The motor base is arranged at the center of the air duct of the body. The brushless motor is disposed on the motor base, and the brushless motor has a rotating shaft facing the air inlet. The fan assembly is connected to the shaft of the brushless motor. The fan assembly has a plurality of blades arranged at intervals. The bottom of the control box is fixed on the outside of the body. The control box is provided with a control module and a drive circuit board which are electrically connected to each other. The drive power of the drive circuit board is 10 watts to 500 watts. Connected to a power cord and the brushless motor. The heat dissipation structure passes through the control box and is in contact with the driving circuit board and is exposed outside the control box.

The following only illustrates the possible implementation aspects of the present invention by way of examples, but is not intended to limit the scope of the present invention to be protected, which will be described first.

Please refer to FIGS. 1 to 8, which shows a preferred embodiment of the present invention. The axial flow fan of the present invention includes a body 1, a motor base 2, a brushless motor 3, a fan assembly 4, and a control box 5 和 一 热 结构 6。 5 and a heat dissipation structure 6.

The body 1 is provided with an axially extending air duct 11 therein. One end of the air duct 11 is provided with an air inlet 12 and the other end is provided with an air outlet 13.

The motor base 2 is disposed at the center of the air duct 11 of the body 1. In this embodiment, the motor base 2 is further provided with a plurality of air guiding fins 21 extending radially outward, and the ends of each of the air guiding fins 21 are fixed to the The air duct has 11 perimeters.

The brushless motor 3 is disposed on the motor base 2. The brushless motor 3 has a rotating shaft 31 facing the air inlet 12.

The fan assembly 4 is connected to a rotating shaft 31 of the brushless motor 3. The fan assembly 4 has a plurality of blades 41 arranged at intervals.

The bottom of the control box 5 is fixed to the outside of the body 1. In this embodiment, the bottom of the control box 5 is fixed to the outside surface of the body 1. The control box 5 is provided with a control module 51 and a driving circuit board which are electrically connected. 52. The driving power of the driving circuit board 52 is 10 watts to 500 watts. The driving circuit board 52 is electrically connected to a power line 53 and the brushless motor 3, respectively. In this embodiment, the control module 51 is provided with a motor start switch 511, a motor speed switch 512, and a motor speed display 513, so as to start the brushless motor 3 and regulate the rotation speed of the brushless motor 3. And displays the number of revolutions currently being adjusted or the number of segments set.

The heat dissipation structure 6 passes through the control box 5 and is in contact with the driving circuit board 52 and is exposed outside the control box 5.

In actual use, the control box 5 is used to control the brushless motor 3 to drive the fan assembly 4 to rotate, so as to suck airflow from the air inlet 12 into the air duct 11 and the wind deflectors 21, and then pass through the outlet. The tuyere 13 blows out a straight axial flow. Since the driving power of the driving circuit board 52 is from 10 watts to 500 watts, the brushless motor 3 can have high power rotation efficiency to greatly increase the air supply distance and air volume, and improve The air supply effect, and because the control box 5 is arranged outside the body 1 and does not contact the water and gas contained in the axial flow, it can avoid failure and damage, so as to extend the service life and make it more convenient to use. In addition, since the heat dissipation structure 6 passes through the control box 5 and contacts the driving circuit board 52 and is exposed to the outside of the control box 5, the driving circuit board 52 of the control box 5 can effectively dissipate heat without As a result, the temperature is too high to prevent the driving circuit board 52 from generating heat or burning. Therefore, the axial flow fan of the present invention can have a large air supply distance and air volume, and has high durability and high safety.

Specifically, the driving circuit board 52 is provided with a plurality of pins 521 and a plurality of thermally conductive blocks 522, and the pins 521 are respectively inserted in the thermally conductive blocks 522, and the thermally conductive blocks 522 are in contact with the heat dissipation structure 6, so that the The thermal energy generated when the driving circuit board 52 is energized can be conducted to the heat-conducting block 522 through the pins 521, and the heat can be dissipated by the heat-dissipating structure 6. In this embodiment, the heat dissipation structure 6 includes a heat conduction plate 61 and a plurality of heat dissipation fins 62. One side of the heat conduction plate 61 is in contact with the heat conduction blocks 522, and the other side is in contact with the heat dissipation fins 62. The heat-dissipating fins 62 are exposed outside the control box 5. The heat-dissipating fins 62 can increase the heat-dissipating area with the outside air, and thus can greatly improve the heat-dissipating ability.

Further, one side of the control box 5 is provided with a detachably assembled partition plate 54. The heat dissipation structure 6 includes a frame member 63. The heat conducting plate 61 is disposed in the frame member 63, and the frame member 63 can be fixed. A partition plate 54 is provided on the control box 5. Further, the partition plate 54 is provided with a set of connection holes 541, and at least one of opposite sides of the set of connection holes 541 has a set of connection plates 542 extending laterally. In this embodiment, both of the connection holes are provided with the set of connection plates 542. Plate 542, the frame member 63 abuts against the two groups of connection plates 542 and is locked to at least one of the group of connection plates 542, so that the frame member 63 and the partition plate 54 are fixed. In addition, in this embodiment, The heat-conducting blocks 522 are locked to the heat-conducting plate 61 so that the driving circuit board 52 is fixed to the partition plate 54 and the heat-dissipating structure 6. Therefore, the control box 5 is more convenient in assembly or disassembly, and does not cause the components to be scattered. Preferably, one of the partition plate 54 and the control box 5 is extended with at least a first folding edge 543, and the other is provided with at least a first locking hole 544. In this embodiment, the partition plate 54 There are two first folds 543, and two side plates of the control box 5 are provided with a plurality of first locking holes 544, and each of the first locking holes 544 and a first fold 543 are connected by a locking member 56 respectively. Phase lock.

In this embodiment, the driving circuit board 52 is further provided with a remote control module 523. The remote control module 523 is for communication with a wireless remote control to control the switch and the rotation speed of the brushless motor 3. The remote control module 523 A remote control antenna 524 is connected to the heat conductive plate 61 so that one end of the remote control antenna 524 is located outside the control box 5 and between two adjacent heat dissipation fins 62 to avoid the The control box 5 shields the remote antenna from receiving signals.

Preferably, a plurality of telecommunication connectors 55 are provided on one side of the control box 5, and each of the telecommunication connectors 55 is electrically connected to the driving circuit board 52, so that the driving circuit board 52 can be connected to the driving circuit board 55 through the telecommunication connector 55. Receive external input speed setting mode (such as DMX multiple digital communication protocol), and then cooperate with a motor speed setting device 514 of one of the control modules 51 to control the operation of the brushless motor 3, so as to achieve remote and accurate control of the remote Operation of the brushless motor 3.

In detail, in this embodiment, a fixing frame 7 is further included. An upper support rod 71 is provided on each side of the fixing frame 7 opposite to each other. The body 1 is disposed between the two upper support rods 71. Two adjusting bolts are provided. 72 is locked on both sides of the two upper support rods 71 and the body 1, respectively, and the angle of the body 1 relative to the fixing frame 7 can be adjusted. In addition, the bottom of the control box 5 is arc-shaped and fits with the arc-shaped outer surface of the body 1. Each side of the bottom of the control box 5 is provided with an outer flange 57, and the two outer flanges 57 pass through a plurality of fasteners 56. It can be fixed to the body 1 by being locked with the curved outer surface of the body 1, and the diameter of the air inlet 12 is larger than the diameter of the air outlet 13.

In summary, the axial flow fan of the present invention can effectively make the brushless motor in a high-wattage state, and the driving circuit board for controlling the rotation of the brushless motor can effectively dissipate heat without causing excessive temperature. In order to avoid heat or burnout of the driving circuit board, the axial flow fan of the present invention can have higher durability and safety.

1‧‧‧ body

2‧‧‧Motor base

3‧‧‧Brushless motor

4‧‧‧fan assembly

5‧‧‧control box

6‧‧‧Heat dissipation structure

7‧‧‧ fixed frame

11‧‧‧ wind tunnel

12‧‧‧air inlet

13‧‧‧outlet

21‧‧‧ wind deflector

31‧‧‧Shaft

41‧‧‧ Blade

51‧‧‧control module

52‧‧‧Drive circuit board

53‧‧‧Power cord

54‧‧‧ bulkhead

55‧‧‧Telecom connector

56‧‧‧Lock Firmware

57‧‧‧Outside hem

511‧‧‧motor start switch

512‧‧‧motor speed switch

513‧‧‧ Motor speed display

514‧‧‧Motor speed setting device

521‧‧‧pins

522‧‧‧Conductive block

523‧‧‧Remote control module

524‧‧‧Remote Antenna

541‧‧‧set of sockets

542‧‧‧Assembly plate

543‧‧‧First Fold

544‧‧‧first locking hole

61‧‧‧Heat conduction plate

62‧‧‧Cooling Fin

63‧‧‧Frame

71‧‧‧ Upper pole

72‧‧‧ adjusting bolt

FIG. 1 is a perspective view of a preferred embodiment of the present invention. FIG. 2 is a side perspective view of a preferred embodiment of the present invention. 3 and 4 are perspective views of a control box according to a preferred embodiment of the present invention. FIG. 5 is a side perspective view of FIG. 4. FIG. 6 is an exploded view of FIG. 4. FIG. 7 is a partially enlarged view of a control box according to a preferred embodiment of the present invention. 8 is a partial side sectional view of a control box according to a preferred embodiment of the present invention.

Claims (9)

An axial flow fan includes: a machine body, an air duct extending axially is provided in the machine body, an air inlet is provided at one end of the air duct, and an air outlet is provided at the other end; and a motor seat is provided in the air duct of the body. Center; a brushless motor provided at the motor base, the brushless motor having a rotating shaft facing the air inlet; a fan assembly connected to the rotating shaft of the brushless motor, the fan assembly having a plurality of spaced-apart rows Blade; a control box, the bottom of the control box is fixed to the outside of the body, the control box is provided with a control module and a driving circuit board which are electrically connected, and the driving power of the driving circuit board is 10 watts to 500 watts, the The driving circuit board is electrically connected to a power line and the brushless motor, respectively; a heat dissipation structure is passed through the control box and contacts the driving circuit board and is exposed outside the control box; wherein, the driving circuit board A plurality of pins and a plurality of heat conducting blocks are provided, and the pins are respectively inserted in the heat conducting blocks, and the heat conducting blocks are in contact with the heat dissipation structure. The axial flow fan according to claim 1, wherein the heat dissipation structure comprises a heat conducting plate and a plurality of heat dissipation fins, one side of the heat conducting plate is in contact with the heat conducting blocks, and the other side is in contact with the heat dissipation fins. Upon contact, the heat sink fins are exposed outside the control box. The axial flow fan according to claim 2, wherein one side of the control box is provided with a detachably assembled partition, the heat dissipation structure includes a frame member, and the heat conducting plate is disposed in the frame member. The axial flow fan according to claim 3, wherein the partition plate is provided with a set of connection holes, and at least one of opposite sides of the set of connection holes has a set of connection plates extending laterally, and the frame member abuts against the at least one A set of connecting plates is locked to the at least one set of connecting plates. The axial flow fan according to claim 3, wherein one of the partition plate and the control box is provided with at least a first folding edge, and the other is provided with at least a first locking hole, each of the first The locking holes are respectively locked with a first folding edge by a locking member. The axial flow fan according to claim 2, wherein the driving circuit board is further provided with a remote control module, and the remote control module is connected with a remote control antenna, and the remote control antenna is passed through the heat conducting plate to make the remote control antenna One end is located outside the control box and between two adjacent heat sink fins. The axial flow fan according to claim 1, wherein the control module is provided with a motor start switch, a motor speed switch and a motor speed display. The axial flow fan according to claim 7, wherein one side of the control box is provided with a plurality of telecommunication connectors, and each of the telecommunication connectors is electrically connected to the driving circuit board, so that the driving circuit board can pass through the telecommunication The connector is in a speed setting mode that receives external input, and then cooperates with a motor speed setting device of the control module to control the operation of the brushless motor. The axial flow fan according to claim 3, further comprising a fixing frame, an upper support rod is provided on each side of the fixing frame, and the body is disposed between the two upper support rods, and two adjusting bolts are locked respectively. It is fixed on the two upper support rods and the two sides of the body; the bottom of the control box is arc-shaped and fits with the curved outer surface of the body. Each side of the bottom of the control box is provided with an outer hem, and the two outer The flange is locked to the arcuate outer surface of the body through a plurality of locking members. The diameter of the air inlet is larger than the diameter of the air outlet. The motor base is provided with a plurality of air guide blades extending radially outward. The end of the air piece is fixed to the periphery of the air duct; the bottom of the control box is fixed to the outer surface of the machine body; the frame member can be fixedly passed through the partition of the control box; the heat conduction blocks are locked to the heat conduction plate so that the The driving circuit board and the partition are fixed to the heat dissipation structure.