Evaporation brushless fan with novel heat dissipation structure

Abstract

The invention relates to an evaporation brushless fan with a novel heat dissipation structure. The air blower comprises a mounting plate, an air blowing chamber, a brushless motor and a centrifugal fan, an air blowing opening is formed in the mounting plate, air inlets are formed in the two sides of the air blowing chamber, a metal shell is arranged outside the brushless motor, a plurality of cooling fins are integrally arranged on the metal shell, and the metal shell is wrapped with a motor cooling shell; the motor heat dissipation shell is composed of a cylindrical section, two transition sections and two extension sections, the two extension sections extend into the air inlet, a plurality of abutting plates are arranged on the inner wall of the cylindrical section in a protruding mode, the abutting plates are fixed to the outer wall of the metal shell in an abutting mode, an air flow channel is defined between the abutting plates, and a plurality of air inlet through holes are formed in the cylindrical section. According to the invention, the flowing path of the airflow is restrained through the motor heat dissipation shell, so that the airflow flows close to the metal shell, the airflow is ensured to have an enough flowing speed, and meanwhile, the abutting plate in the motor heat dissipation shell can also play a role in fixing the brushless motor.

Description

Technical Field

[0001] The present invention relates to a kind of, in particular to an evaporative brushless fan with a novel heat dissipation structure. Background Art

[0002] In large-scale enclosed spaces such as large shopping malls and workshops, air-conditioning evaporative fans are commonly used as refrigeration equipment, and at the same time, they also have the effect of adjusting humidity. Compared with central air conditioners, the procurement cost and energy consumption of air-conditioning evaporative fans are much lower. An air-conditioning evaporative fan generally consists of a brushless motor fan, an evaporative cooling module and an air duct. Among them, the brushless motor fan is a blowing mechanism and needs to run continuously for a long time. During the high-speed operation of the brushless motor, heat will be generated by both current and friction, resulting in a gradual increase in the temperature of the motor. If the motor temperature is too high, it will lead to a decline in power performance, a shortening of mechanical life, and a risk of insulation aging and short circuit. Therefore, the motors on existing brushless motor fans are all equipped with heat dissipation designs. Conventional heat dissipation designs include setting heat dissipation metal plates on the motor housing to increase the contact area with air, and also by designing the position of the air inlet and arranging the motor near the air inlet to increase the flow rate of the external air flow of the motor. However, since the wind force outside the air inlet decays very seriously with distance, only the area near the air inlet will generate obvious high-speed air flow, so the effect of cooling through the air flow at the air inlet is not ideal. Summary of the Invention

[0003] The present invention provides an evaporative brushless fan with a novel heat dissipation structure, solving the problem of poor heat dissipation effect in the prior art.

[0004] The above technical problems of the present invention are mainly solved by the following technical solutions: An evaporative brushless fan with a novel heat dissipation structure includes a mounting plate, two blowing chambers provided on the mounting plate, and a brushless motor. The brushless motor is located between the two blowing chambers. A centrifugal fan connected to the brushless motor shaft is provided in the blowing chamber. Two air outlets communicating with the blowing chamber are provided on the mounting plate. Air inlets are provided on both sides of the blowing chamber. A metal housing is provided outside the brushless motor. A plurality of heat dissipation fins are integrally provided on the metal housing. The outside of the metal housing is wrapped with a motor heat dissipation shell. The motor heat dissipation shell is fixed relative to the mounting plate. The motor heat dissipation shell consists of a cylindrical section, two transition sections and two extension sections. The two transition sections are mirror-symmetrically provided on both sides of the cylindrical section. The two extension sections are respectively connected to the two transition sections. The two extension sections are arranged to extend into the air inlets. A plurality of abutting plates distributed in a circumferential array are convexly provided on the inner wall of the cylindrical section. The abutting plates are abutted and fixed to the outer wall of the metal housing. An air flow channel is defined between the abutting plates. A plurality of air inlet through holes are provided on the cylindrical section.

[0005] In the present invention, a motor heat dissipation shell is sleeved outside the brushless motor, and a plurality of air intake through holes are provided on the cylindrical section of the motor heat dissipation shell. At the same time, both ends of the motor heat dissipation shell are communicated with the air intake through the extension sections. After the brushless motor is started, the centrifugal fans in the two blower chambers are in a high-speed rotation state, and the air intake is in a negative pressure state. The high-speed air flow is discharged from the blower ports. Therefore, the opening part of the extension section at the air intake is also in a negative pressure state. The pressure difference drives the cold air to be inhaled from the air intake through holes and flows along the paths of the cylindrical section, the transition section, and the extension section. During this process, the air flow will flow through various regions of the metal shell, especially will fully contact with the heat sinks to achieve efficient heat exchange, and finally the air flow takes away the heat generated by the brushless motor. In the present invention, the motor heat dissipation shell is used to restrict the flow path of the air flow, so that the air flow closely adheres to the metal shell, ensuring that the air flow has sufficient flow velocity. At the same time, the abutting plate in the motor heat dissipation shell can also play a role in fixing the brushless motor.

[0006] Furthermore, the outer diameter of the extension section is smaller than that of the cylindrical section, and the outer end of the extension section is provided with a flared opening. In order to allow the air flow to flow through the two end faces of the brushless motor as much as possible, the outer shape of the transition section is a conical structure. Therefore, the outer diameter of the extension section is smaller than that of the cylindrical section. At the same time, if the opening of the extension section is too small, according to Pascal's law, the suction force on the air flow is too small, so it is necessary to set a flared opening.

[0007] Furthermore, an annular air intake gap is formed between the extension section and the corresponding air intake. Since the present invention provides an extension section at the inner air intake, although the air intake can be supplemented with air from the extension section, compared with the outer air intake, it has a certain suction resistance. Therefore, the air intake efficiency of the two air intakes on the same blower chamber will be significantly different. In order to avoid the situation of insufficient air intake, the present invention also provides an annular air intake gap between the extension section and the air intake to supplement the air intake.

[0008] Therefore, the present invention has the following characteristics compared with the prior art: 1. In the present invention, the motor heat dissipation shell is used to restrict the flow path of the air flow, so that the air flow closely adheres to the metal shell, ensuring that the air flow has sufficient flow velocity. At the same time, the abutting plate in the motor heat dissipation shell can also play a role in fixing the brushless motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] FIG Figure 1 is a schematic structural diagram of the present invention;

[0010] FIG Figure 2 is a schematic structural diagram of the present invention from another perspective;

[0011] FIG Figure 3 is a schematic internal structure diagram of the present invention;

[0012] FIG Figure 4 is a schematic structural diagram of the motor heat dissipation shell. Detailed implementation manners

[0013] The technical solutions of the present invention will be further specifically described below through embodiments in combination with the accompanying drawings.

[0014] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0015] Embodiment 1: See Figure 1 、 Figure 2 and Figure 3 , an evaporation brushless fan with a novel heat dissipation structure, including a mounting plate 10, two blower chambers 20 provided on the mounting plate, and a brushless motor 30. The brushless motor is located between the two blower chambers. A centrifugal fan 40 connected to the brushless motor shaft is provided in the blower chamber. Two air inlets 11 communicating with the blower chamber are provided on the mounting plate. Air inlets 21 are provided on both sides of the blower chamber. A metal shell 31 is provided outside the brushless motor. A plurality of heat dissipation fins 32 are integrally provided on the metal shell. The heat dissipation fins are provided at both ends of the metal shell and are radially distributed relative to the brushless motor. The outside of the metal shell is wrapped with a motor heat dissipation shell 50 made of plastic material. The motor heat dissipation shell is fixed relative to the mounting plate. The motor heat dissipation shell is composed of a cylindrical section 51, two transition sections 52, and two extension sections 53. The two transition sections are mirror-symmetrically provided on both sides of the cylindrical section. The two extension sections are respectively connected to the two transition sections. The two extension sections are arranged to extend into the air inlets. A plurality of abutting plates 54 (see Figure 4 ) protruding in a circumferentially arrayed manner are provided on the inner wall of the cylindrical section. The abutting plates are in abutting and fixing connection with the outer wall of the metal shell. An air flow channel 60 is defined between the abutting plates. Six air intake through holes 55 are provided on the cylindrical section in a circumferentially arrayed manner.

[0016] In this embodiment, a motor heat dissipation shell is sleeved outside the brushless motor, and a number of air intake through holes are provided on the cylindrical section of the motor heat dissipation shell. At the same time, both ends of the motor heat dissipation shell are communicated with the air intake port through the extension sections. After the brushless motor is started, the centrifugal fans in the two blower chambers are in a high-speed rotation state, and the air intake port part is in a negative pressure state. The high-speed air flow is discharged from the air outlet. Therefore, the opening part of the extension section at the air intake port part is also in a negative pressure state. The pressure difference will drive the cold air to be inhaled from the air intake through holes and flow along the paths of the cylindrical section, the transition section, and the extension section. During this process, the air flow will flow through various regions of the metal shell, especially will fully contact with the heat sinks to achieve efficient heat exchange, and finally the air flow will take away the heat generated by the brushless motor. In this embodiment, the motor heat dissipation shell is used to restrict the flow path of the air flow, so that the air flow closely adheres to the metal shell, ensuring that the air flow has sufficient flow velocity. At the same time, the abutting plate in the motor heat dissipation shell can also play a role in fixing the brushless motor.

[0017] See Figure 3 , the outer diameter of the extension section is smaller than that of the cylindrical section, and the outer end of the extension section is provided with a flared opening. In order to allow the air flow to flow through both end faces of the brushless motor as much as possible, the outer shape of the transition section is a conical structure. Therefore, the outer diameter of the extension section is smaller than that of the cylindrical section. At the same time, if the opening of the extension section is too small, according to Pascal's law, the suction force on the air flow is too small, so it is necessary to set a flared opening.

[0018] See Figure 3 , an annular air intake gap 22 is formed between the extension section and the corresponding air intake port. Since this embodiment sets an extension section at the inner air intake port, although this air intake port can obtain air supplement from the extension section, compared with the outer air intake port, it has a certain suction resistance. Therefore, the air intake efficiency of the two air intake ports on the same blower chamber will be significantly different. In order to avoid the situation of insufficient air intake, this embodiment also provides an annular air intake gap between the extension section and the air intake port to supplement the air intake.

[0019] See Figure 3 , the metal shell is a two-piece structure, and a flange structure 33 is formed at the docking part. The abutting plate is divided into left and right parts and is respectively clamped on both sides of the flange structure.

[0020] See Figure 1 and Figure 4 , the motor heat dissipation shell is divided into an upper shell 1 and a lower shell 2. The edge of the upper shell is provided with an upward flanging 3, and the edge of the lower shell is provided with a downward flanging 4. At least four connecting columns 12 are vertically fixed on the mounting plate, and positioning screws 13 passing through the upward flanging and the downward flanging are provided at the top of the connecting columns; two arc-shaped positioning seats 14 abutting against the lower shell are also provided on the mounting plate.

[0021] It will be apparent to those skilled in the art that the present invention may be varied in many ways, and such variations are not regarded as departing from the scope of the present invention. All such modifications that are obvious to those skilled in the art will be included within the scope of the present claims.

Claims

1. An evaporative brushless fan with a novel heat dissipation structure, comprising a mounting plate, two blast chambers arranged on the mounting plate, and a brushless motor, wherein the brushless motor is located between the two blast chambers, a centrifugal fan connected to the brushless motor shaft is arranged in the blast chamber, two blast ports communicating with the blast chambers are arranged on the mounting plate, and air inlets are arranged on both sides of the blast chamber, characterized in that: A metal shell is provided on the outside of the brushless motor, and a plurality of heat sinks are integrally provided on the metal shell. A motor heat dissipation shell is wrapped on the outside of the metal shell, and the motor heat dissipation shell is fixed relative to the mounting plate. The motor heat dissipation shell is composed of a cylindrical section, two transition sections and two extension sections. The two transition sections are mirror-imaged on both sides of the cylindrical section, and the two extension sections are respectively connected to the two transition sections. The two extension sections are arranged to extend into the air inlet, and a plurality of abutment plates distributed in a circumferential array are convexly provided on the inner wall of the cylindrical section. The abutment plates are abutted and fixed to the outer wall of the metal shell, and an air flow channel is defined between the abutment plates. A plurality of air inlet through holes are provided on the cylindrical section.

2. The evaporative brushless fan with a novel heat dissipation structure according to claim 1 is characterized in that: The outer diameter of the extension section is smaller than that of the cylindrical section, and the outer end of the extension section is arranged in a trumpet-shaped expansion.

3. The evaporative brushless fan with a novel heat dissipation structure according to claim 2 is characterized in that: An annular air intake gap is formed between the extension section and the corresponding air intake port.

4. The evaporative brushless fan with a novel heat dissipation structure according to claim 1 is characterized in that: The metal shell is a two-petal structure, a flange structure is formed at the butting portion, and the abutment plate is divided into left and right parts, which are respectively clamped on both sides of the flange structure.

5. The evaporative brushless fan with a novel heat dissipation structure according to claim 1 is characterized in that: The motor heat dissipation shell is divided into an upper shell and a lower shell. The edge of the upper shell is provided with an upper flange, and the edge of the lower shell is provided with a lower flange. A plurality of connecting columns are vertically fixed on the mounting plate, and the top of the connecting column is provided with a positioning screw that passes through the upper flange and the lower flange; the mounting plate is also provided with an arc-shaped positioning seat that abuts against the lower shell.

6. The evaporative brushless fan with a novel heat dissipation structure according to claim 1 is characterized in that: The heat sinks are arranged at two ends of the metal shell, and the heat sinks are distributed in a radial shape relative to the brushless motor.

Images