Noise reduction air supply device

Abstract

The present invention relates to the field of fans, and discloses a noise-reducing air supply device. An inner cylinder is sleeved on the outside of a driving motor to form a first air duct connected to an air inlet, and an outer cylinder is sleeved on the outside of the inner cylinder, with one end close to the fan, so that the outer cylinder and the inner cylinder form a second air duct connected to the first air duct, and the outer cylinder and the fan form an air suction port. Therefore, when the driving motor drives the fan to run, negative pressure is generated, and outside air enters the fan through the air suction port, the second air duct, the first air duct and the air inlet. In the process of outside air entering the fan, the driving motor is cooled. Therefore, the noise-reducing air supply device provided by the present invention can not only cool the driving motor, but also reduce working noise.

Description

Technical Field

[0001] The invention relates to the field of fans, and in particular to a noise-reducing air supply device. Background Art

[0002] Centrifugal fans are widely used in ventilation, dust removal and cooling of factories, mines, tunnels, cooling towers, vehicles, ships and buildings; ventilation and air intake of boilers and industrial furnaces; cooling and ventilation in air conditioning equipment and household appliances; drying and conveying of grains; wind tunnel wind sources and inflation and propulsion of hovercraft, etc.

[0003] With the further improvement of environmental protection requirements, China Special Inspection Institute has made new regulations on the noise of industrial boiler burners under the current standards (the noise at 1.5 meters from the burner shall not be higher than 85dBA). As we all know, the operating noise of the burner mainly comes from the fan, and the noise of the fan is mainly the pneumatic noise of the airflow, the mechanical operation noise of the fan and the electromagnetic noise of the motor.

[0004] Currently, the most widely used method is to install a silencer at the fan suction port. This solution can suppress most of the fan's aerodynamic noise, but does not solve the mechanical noise and electromagnetic noise. The overall machine noise is basically around 85dBA. Installing a silencer on the motor side will affect the heat dissipation of the motor and create a safety hazard. Summary of the invention

[0005] The present invention is made to solve the above-mentioned problems, and its object is to provide a noise reduction air supply device.

[0006] The present invention provides a noise-reducing air supply device, comprising: a fan having an air inlet; a drive motor installed at the air inlet and used for driving an impeller in the fan to rotate; an inner cylinder sleeved on the outside of the drive motor, the inner side surface of the inner cylinder and the outer side surface of the drive motor forming a first air duct connected to the air inlet; an outer cylinder sleeved on the outside of the inner cylinder, the inner side surface of the outer cylinder and the outer side surface of the inner cylinder forming a second air duct connected to the first air duct, and an air suction port formed between the outer cylinder and the fan, the air suction port being used for supplying external air flow into the second air duct.

[0007] The noise reduction air supply device provided by the present invention may also have the following features: the outer side surface of the inner cylinder has a plurality of slide rails, the length direction of the slide rails is parallel to the length direction of the inner cylinder; the inner side surface of the inner cylinder has a plurality of slide grooves matched with the slide rails, and the inner cylinder is slidably connected to the outer cylinder for adjusting the air inlet area of ​​the air suction port; the inner cylinder and the outer cylinder are fixed by a locking member.

[0008] The noise reduction air supply device provided by the present invention may also have the following features:

[0009] The air volume regulating mechanism is used to regulate the air volume entering the first air duct, and the air volume regulating mechanism comprises: a damper rotatably mounted at one end of the inner cylinder; and an air regulating motor mounted on the inner cylinder and used to rotate the damper.

[0010] The noise reduction air supply device provided by the present invention may also have the following features: the air volume adjustment mechanism also includes: a main transmission block, installed on the rotating shaft of the air adjustment motor; a slave transmission block, installed on the rotating shaft of the damper; a connecting rod, the two ends of which are respectively rotatably connected to the main transmission block and the slave transmission block.

[0011] The noise reduction air supply device provided by the present invention may also have the following features: the fan includes: a shell having an air inlet and an air outlet; an impeller shaft passing through the impeller and rotatably connected to the shell; and an impeller located in the shell and mounted on the impeller shaft.

[0012] The noise reduction air supply device provided by the present invention may also have such a feature, and further include: a coupling connecting the rotating shaft of the driving motor and the impeller shaft.

[0013] The noise reduction air supply device provided by the present invention may also have such a feature, further comprising: a motor mounting plate installed between the driving motor and the housing.

[0014] The noise reduction air supply device provided by the present invention may also have such a feature, and further includes: an air guide tube, which is sleeved on the outside of the impeller shaft, and one end of the air guide tube is installed on the motor mounting plate, and the other end is close to the impeller.

[0015] In the noise reduction air supply device provided by the present invention, it can also have the following characteristics: wherein, the outer cylinder includes: an end cover portion; an inner cylinder portion, one end of which is installed on the end cover portion; an outer cylinder portion, which is sleeved on the outside of the inner cylinder portion, one end of the outer cylinder portion is installed on the end cover portion, and the length of the outer cylinder portion is greater than the length of the inner cylinder portion; an inclined portion, one end of which is installed on the other end of the inner cylinder portion, and the other end is installed on the other end of the outer cylinder portion.

[0016] The noise reduction air supply device provided by the present invention may also have the following features, including: sound-absorbing cotton installed on the inner side of the inner cylinder.

[0017] Functions and Effects of the Invention

[0018] According to the noise reduction air supply device involved in the present invention, because the inner cylinder is sleeved on the outside of the driving motor to form a first air duct connected to the air inlet, the outer cylinder is sleeved on the outside of the inner cylinder, and one end is close to the fan, so that the outer cylinder and the inner cylinder form a second air duct connected to the first air duct, and the outer cylinder and the fan form an air suction port. Therefore, when the driving motor drives the fan to run, negative pressure is generated, and the outside air enters the fan through the air suction port, the second air duct, the first air duct and the air inlet. In the process of the outside air entering the fan, the driving motor is cooled. Therefore, the noise reduction air supply device provided by the present invention can not only dissipate the heat of the driving motor, but also reduce the working noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a three-dimensional diagram of the noise reduction air supply device in this embodiment;

[0020] Figure 2 is a right side view of the noise reduction air supply device in this embodiment;

[0021] Figure 3 yes Figure 2 Middle A——A section view;

[0022] Figure 4 yes Figure 2 Middle B——B stereoscopic cross-sectional view;

[0023] Figure 5 is a schematic diagram of the noise reduction air supply device in this embodiment after the outer cylinder is hidden; and

[0024] Figure 6 Schematic diagram of the locking member in this embodiment. DETAILED DESCRIPTION

[0025] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is described in detail below in conjunction with embodiments and drawings.

[0026] Figure 1 is a three-dimensional diagram of the noise reduction air supply device in this embodiment, Figure 2 2 is a right side view of the noise reduction air supply device in this embodiment. Figure 3 yes Figure 2 A——A section view, Figure 4 yes Figure 2 Middle B——B stereoscopic cross-sectional view, Figure 5 is a schematic diagram of the noise reduction air supply device in this embodiment after the outer cylinder is hidden and Figure 6 Schematic diagram of the locking member in this embodiment.

[0027] like Figures 1 to 6As shown, the noise reduction air supply device 100 in this embodiment includes a fan 1, a motor mounting plate 2, an air guide tube 3, a drive motor 4, a coupling 5, an inner tube 6, an outer tube 7, sound-absorbing cotton (not shown in the figure), a bracket 8, a guide rail 9 and an air volume adjustment mechanism 10.

[0028] like Figure 3 As shown, the fan 1 includes a housing 11 , an impeller shaft 12 , a rotary bearing 13 , and an impeller 14 .

[0029] The housing 11 has an air inlet (not shown), an air outlet 111 and a mounting hole (not shown). The air inlet and the mounting hole are circular in shape, and the axes of the air inlet and the mounting hole coincide with each other.

[0030] The impeller shaft 12 passes through the housing 11 through the air inlet and the mounting hole, and one end of the impeller shaft 12 is rotatably connected to the housing 11 through a rotating bearing 13 installed at the mounting hole.

[0031] The impeller 13 includes a disk body 131 , a plurality of blades 132 and a connecting body 133 .

[0032] The disk body 131 is fixedly mounted on the impeller shaft 12 .

[0033] The bottom surfaces of the plurality of blades 132 are mounted on one side of the disk body 131, and the plurality of blades 132 extend along the axial direction of the disk body 131. In this embodiment, the blades 132 are arc-shaped, and the height of the blades 132 gradually decreases from the rotation center of the disk body 131 to the edge of the disk body 131.

[0034] The connector 133 has a trumpet-shaped appearance, and the top surface of the connector is connected to the plurality of blades.

[0035] In this embodiment, the fan 1 is an F-shaped fan.

[0036] The motor mounting plate 2 includes a circular plate 21 and four ribs 22 .

[0037] The disc 21 is installed at the air inlet of the housing 11. A through hole is provided at the center of the disc 21. A bearing matching the impeller shaft 12 is installed at the through hole, thereby providing a double-point support for the impeller shaft 12. In addition, the disc 21 is provided with four through holes connected to the air inlet. The four through holes are distributed in an annular manner around the through hole of the disc 21.

[0038] Four ribs 22 are vertically mounted on the outer side of the disk 21 and are distributed in an annular manner around the through hole of the disk 21 .

[0039] The air guide tube 3 is sleeved on the impeller shaft 12 , and one end of the air guide tube 3 is fixed to the inner side of the disc 21 , and the other end extends into the connector 133 , thereby guiding the wind flowing out of the four through holes to one end of the blade 132 close to the impeller shaft 12 .

[0040] In this embodiment, the air inlet areas at both ends of the air guide tube 3 are the same, and the air inlet area in the middle is smaller than the air inlet areas at both ends. The outer side surface of the air guide tube 3 and the inner side surface of the connecting body 133 form a gap.

[0041] The drive motor 4 is mounted on the four ribs 22 of the motor mounting plate 2 and is fixedly connected to the impeller shaft 12 of the fan 1 through the coupling 5. In this embodiment, the drive motor 4 is a high-efficiency motor, which refers to a general standard motor with high efficiency (conforming to the second level standard or above of the new motor energy efficiency standard (GB18613-2012), international IE3 IE4).

[0042] The inner cylinder 6 includes a square shell 61 and four crescent plates 62 .

[0043] The square shell 61 is sleeved on the outside of the driving motor 4, and one end is installed on the disc 21 of the motor mounting plate 2 by bolt connection, so that the inner side surface of the square shell 61 and the outer side surface of the driving motor 4 form a first channel a connected with four through holes, and then the wind in the first channel a enters the fan 1 through the four through holes.

[0044] The four crescent plates 62 have straight edges and arc edges, and are vertically mounted on the outer side of the square housing 61 through the straight edges, and are close to the fan 1. One pair of oppositely arranged crescent plates is provided with an air gap with the first channel.

[0045] The outer cylinder 7 includes an end cover 71, an inner cylinder 72, an outer cylinder 73 and an inclined portion 74. In this embodiment, the inner cylinder 72 and the outer cylinder 73 are cylindrical in shape, and the length of the inner cylinder 72 is smaller than that of the outer cylinder 73. One end of the inner cylinder 72 is vertically mounted on the end cover 71, and one end of the outer cylinder 73 is vertically mounted on the end cover 71, and the outer cylinder 73 is sleeved on the outside of the inner cylinder 72 and coincides with the axis of the inner cylinder 72. The inclined portion 74 is horn-shaped in shape, with a large end and a small end, the large end of the inclined portion 74 is mounted on the other end of the outer cylinder 73, and the small end of the inclined portion 74 is mounted on the other end of the inner cylinder 72.

[0046] The sound-absorbing cotton is installed on the inner side of the inner cylinder 72. The inner cylinder 72 has four annular evenly distributed slide grooves, and the length direction of the slide grooves is parallel to the length direction of the inner cylinder 72.

[0047] The bracket 8 includes a square frame 81 , an arc-shaped plate 82 , a column 83 , an adjustment nut 84 , a fixing nut 85 and a pair of support plates 86 .

[0048] The square frame 81 includes two cross bars and three longitudinal bars, the three longitudinal bars are arranged in parallel, and the two ends of the three longitudinal bars are fixedly connected by two cross bars. In this embodiment, the cross bars and the longitudinal bars are channel steels, and a mounting hole is provided on the longitudinal bar on the right side to penetrate up and down.

[0049] The arc plate 82 has an inner side and an outer side, and the outer side of the arc plate is mounted on one end of the column 83 .

[0050] The column 83 has an external thread, and the adjusting nut 84 and the fixing nut 85 are respectively threadedly connected to the column 83 .

[0051] The column 83 passes through the mounting hole of the square frame 81, the adjusting nut 84 is installed on the column 83 and abuts against the top of the longitudinal rod, and the fixing nut 85 is installed on the column 83 and abuts against the bottom of the longitudinal rod, so that the inner side surface of the arc plate 82 abuts against the outer side surface of the outer cylinder 7, thereby supporting the outer cylinder 7.

[0052] A pair of support plates 86 are respectively vertically mounted on the other two longitudinal rods and fixedly connected to the housing 11 of the fan 1, thereby supporting the fan.

[0053] The guide rail 9 is arranged parallel to the inner cylinder 6, and one end of the guide rail 9 is fixed on the crescent plate 62. In this embodiment, the guide rail 9 includes an arc plate 91, a connecting plate 92 and a right-angle plate 93. The outer side surface of the arc plate 91 is adapted to the inner side surface of the outer cylinder portion 73, the right-angle plate 93 abuts against the edge of the square shell 61, and the connecting plate 92 passes through the slide groove of the inner cylinder portion 72 to connect the arc plate 91 and the right-angle plate 93 so that the inner side surface of the inner cylinder portion 72 and the outer side surface of the inner cylinder 6 form a second channel b, and the second channel b is connected to the first channel a.

[0054] The end surface of the outer cylinder 7 and the side surface of the shell 1 form an air suction port, and external wind enters the fan through the air suction port, the air slit, the second channel, the first channel, and the four through holes.

[0055] The outer cylinder 7 and the inner cylinder 6 are slidably connected via the guide rail 9 and fixed via the locking member 20. In this embodiment, the locking member 20 includes a bolt and a nut.

[0056] A mounting boss is provided on the outer side of the inner tube 6, and a rotation hole is formed on the mounting boss. A threaded seat is provided on the inner side of the outer tube 7, and a threaded through hole is formed on the threaded seat. The bolt passes through the rotation hole of the mounting boss and the threaded through hole on the threaded seat, so that the bolt is threadedly connected with the threaded seat. The nut is installed on the bolt and is located between the mounting boss and the threaded seat to prevent the bolt from moving axially. When the size of the air intake port needs to be adjusted, the bolt is rotated, and the threaded seat rotates the circular motion of the bolt into a linear motion, and the threaded seat drives the shell to move closer to or away from the shell 1.

[0057] The air volume adjustment mechanism 10 includes two dampers 101 , an air adjustment motor 102 , a main transmission block 103 , a first slave transmission block 104 , a connecting rod 105 , a second slave transmission block 106 , a third slave transmission block 107 and a linkage rod 108 .

[0058] The two dampers 101 are rectangular in shape, with rotating shafts installed at both ends of the dampers 101, and the axis of the rotating shaft coincides with the center line of the dampers 101. The two dampers 101 are rotatably installed at the other end of the square housing 61 through the rotating shaft, thereby sealing the end of the square housing 61.

[0059] A protrusion is provided at the other end of the square housing 61 , and the air regulating motor 102 is mounted on the protrusion of the square housing 61 .

[0060] The main transmission block 103 is in the shape of a cuboid, with a rotating hole at one end and a fixing hole at the other end. The axes of the rotating hole and the fixing hole are perpendicular to the length direction of the main transmission block. The main transmission block 103 is mounted on the rotating shaft of the air regulating motor 102 through the fixing hole.

[0061] The structures of the first slave transmission block 104 , the second slave transmission block 106 and the third slave transmission block 107 are the same as that of the main transmission block 103 .

[0062] The first slave transmission block 104 is mounted on a rotating shaft at one end of one of the dampers 101 through a fixing hole. Rotating bosses are provided at both ends of the connecting rod 105. The two rotating bosses are respectively inserted into the rotating holes of the main transmission block 103 and the first slave transmission block 104.

[0063] The second slave transmission block 106 is mounted on the rotating shaft at the other end through a fixing hole. The third slave transmission block 107 is mounted on the rotating shaft of another damper through a fixing hole. One end of the linkage rod 108 is rotationally connected to the second slave transmission block 106 through the rotating hole of the second slave transmission block 106, and the other end of the linkage rod 108 is rotationally connected to the third slave transmission block 107 through the rotating hole of the third slave transmission block 107. That is, when the air regulating motor 102 rotates, it drives one of the dampers to rotate through the main transmission block 103, the connecting rod 105, and the first slave transmission block 104. When the damper rotates, it drives the second slave transmission block 106, the linkage rod 108, and the third transmission block 107 to rotate together, so that the two dampers rotate synchronously, thereby adjusting the air inlet area of ​​the square shell.

[0064] Functions and Effects of the Embodiments

[0065] According to the noise reduction air supply device involved in the present embodiment, because the inner cylinder is sleeved on the outside of the driving motor to form a first air duct connected to the air inlet, the outer cylinder is sleeved on the outside of the inner cylinder, and one end is close to the fan, so that the outer cylinder and the inner cylinder form a second air duct connected to the first air duct, and the outer cylinder and the fan form an air suction port. Therefore, when the driving motor drives the fan to run, negative pressure is generated, and the outside air enters the fan through the air suction port, the second air duct, the first air duct and the air inlet. In the process of the outside air entering the fan, the driving motor is cooled. Therefore, the noise reduction air supply device provided by the present embodiment can not only dissipate the heat of the driving motor, but also reduce the working noise.

[0066] The above-mentioned embodiments are preferred examples of the present invention and are not intended to limit the protection scope of the present invention.

Claims

1. A noise reduction air supply device, characterized in that: include: A fan having an air inlet; A driving motor, installed at the air inlet, for driving the impeller in the fan to rotate; An inner cylinder is sleeved on the outer side of the driving motor, and the inner side surface of the inner cylinder and the outer side surface of the driving motor form a first air duct connected with the air inlet; The outer cylinder is sleeved on the outer side of the inner cylinder, and the inner side surface of the outer cylinder and the outer side surface of the inner cylinder form a second air duct connected with the first air duct. An air suction port is formed between the outer cylinder and the fan, and is used to allow external wind to flow into the second air duct; An air volume regulating mechanism, used for regulating the air volume entering the first air duct, Wherein, the air volume adjustment mechanism comprises: A damper rotatably mounted on one end of the inner cylinder; An air regulating motor, mounted on the inner cylinder, for rotating the air door; A main transmission block is mounted on the rotating shaft of the air regulating motor; A slave transmission block mounted on the rotating shaft of the damper; The connecting rod has two ends which are rotatably connected to the main transmission block and the slave transmission block respectively. The outer cylinder comprises: End cap: An inner cylinder portion, one end of which is mounted on the end cover portion; An outer cylinder portion is sleeved on the outer side of the inner cylinder portion, one end of the outer cylinder portion is mounted on the end cover portion, and the length of the outer cylinder portion is greater than the length of the inner cylinder portion; The inclined portion has one end mounted on the other end of the inner tube portion and the other end mounted on the other end of the outer tube portion.

2. The noise reduction air supply device according to claim 1, characterized in that: in, The outer side surface of the inner cylinder is provided with a plurality of slide rails, and the length direction of the slide rails is parallel to the length direction of the inner cylinder; The inner side surface of the inner cylinder has a plurality of slide grooves adapted to the slide rails. The inner cylinder is slidably connected to the outer cylinder to adjust the air inlet area of ​​the air suction port; The inner cylinder and the outer cylinder are fixed by a locking member.

3. The noise reduction air supply device according to claim 1, Features: Wherein, the fan comprises: A housing having the air inlet and the air outlet; An impeller shaft, passing through the impeller and rotatably connected to the housing; The impeller is located in the housing and is mounted on the impeller shaft.

4. The noise reduction air supply device according to claim 3, characterized in that: Also includes: A coupling connects the rotating shaft of the driving motor and the impeller shaft.

5. The noise reduction air supply device according to claim 3, characterized in that: Also includes: The motor mounting plate is mounted between the driving motor and the housing.

6. The noise reduction air supply device according to claim 5, characterized in that: Also includes: The air guide tube is sleeved on the outer side of the impeller shaft, and one end of the air guide tube is installed on the motor mounting plate, and the other end is close to the impeller.

7. The noise reduction air supply device according to claim 1, characterized in that: Also includes: The sound-absorbing cotton is installed on the inner side surface of the inner cylinder.

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