Axial flow fan with diffusion porous silencing cylinder

Abstract

The axial flow fan comprises an air guide cylinder, a motor and an impeller, the impeller is fixedly connected to a rotating shaft of the motor, the lower portion of the motor and the impeller are inserted into the air guide cylinder, the conical silencing cylinder is arranged on the upper portion of the motor in a sleeved mode, and a plurality of silencing holes are formed in the cylinder wall of the silencing cylinder. The upper end and the lower end of the silencing barrel are bent to form an upper folded edge and a lower folded edge respectively, the upper end of the air guide barrel is bent to form a connecting edge, the connecting edge and the lower folded edge are fixedly connected together through a plurality of stud assemblies, and each stud assembly is composed of a bolt, a nut and a gasket. A plurality of lug seats are formed on the outer wall of the motor shell, a plurality of motor supports which are horizontally and obliquely arranged are fixedly connected to the lug seats, and the outer ends of the motor supports are inserted into bolts of the stud assemblies in a sleeved mode and clamped and fixed between the connecting edges and the lower folding edges. According to the axial flow fan, the air duct on the outer side is divided into the air guide duct and the silencing duct, silencing and noise reduction are conducted through the silencing holes in the silencing duct, and meanwhile the axial flow fan is convenient to assemble.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of axial flow fan, more specifically to an axial flow fan with a diffusion porous sound attenuation cylinder. BACKGROUND

[0002] The axial flow fan is widely used, and the airflow is in the same direction as the shaft of the fan blade, such as an electric fan. Since the axial flow fan is a device with aerodynamic performance, it is prone to generate impact noise and vortex noise, especially for high-power axial flow fans. The greater the air pressure and air volume of the inlet air, the greater the noise. Therefore, many designs have been proposed to reduce the noise of the axial flow fan. For example, serrations are added to the edge of the fan blade. Some designs add an inner cylinder to the inside of the air guide cylinder. The sound attenuation holes are arranged in a ring shape on the entire cylinder wall of the inner cylinder. The sound attenuation holes are used for sound attenuation and noise reduction. In order to realize the function of the sound attenuation holes, a gap is required between the inner cylinder and the air guide cylinder. The motor is installed in the inner cylinder. The sound attenuation holes weaken the strength of the inner cylinder. Therefore, the motor support needs to pass through the inner cylinder and be fixed to the inner wall of the air guide cylinder, which makes the assembly of the axial flow fan more complex and troublesome. Therefore, the axial flow fan with sound attenuation holes for noise reduction needs to be further improved to achieve sound attenuation and noise reduction while considering the convenience of fan assembly. SUMMARY

[0003] The utility model discloses a kind of axial flow fans with diffusion porous sound attenuation cylinder, and the axial flow fan divides the air cylinder outside into air guide cylinder and sound attenuation cylinder two parts, utilizes sound attenuation hole on sound attenuation cylinder to carry out sound attenuation and noise reduction, while facilitating the assembly of axial flow fan.

[0004] An axial flow fan with diffusion porous sound attenuation cylinder, comprising an air guide cylinder, a motor and an impeller, the impeller is fixed to the shaft of the motor, the lower part of the motor and the impeller are inserted into the air guide cylinder, the upper part of the motor is sleeved with a conical sound attenuation cylinder, and a plurality of sound attenuation holes are formed on the cylinder wall of the sound attenuation cylinder.

[0005] The upper and lower ends of the sound attenuation cylinder are respectively bent to form a horizontal annular upper bent edge and a lower bent edge, the upper end of the air guide cylinder is bent to form a horizontal annular connecting edge, the connecting edge and the lower bent edge are fixedly connected together by a plurality of stud assemblies, and the stud assembly is composed of a bolt, a nut and a washer; a plurality of ear seats are formed on the outer wall of the motor housing, a plurality of horizontally inclined motor supports are fixed to the ear seats, the outer end of the motor support is inserted into the bolt of the stud assembly and clamped and fixed between the connecting edge and the lower bent edge; a plurality of reinforcing rings are inserted into the motor, the reinforcing rings are fixed to the motor support, a protective net is arranged above the motor, and the outer ring of the protective net is fixed to the upper bent edge of the sound attenuation cylinder by screws.

[0006] Preferably, the diameter of the upper end of the sound attenuation cylinder is larger than the diameter of the lower end of the sound attenuation cylinder, and the diameter of the lower end of the sound attenuation cylinder is consistent with the diameter of the upper end of the air guide cylinder;

[0007] The central axis of the sound attenuation cylinder, the central axis of the air guide cylinder, the central axis of the motor and the central axis of the impeller are on the same straight line.

[0008] Preferably, the sound attenuation holes are uniformly distributed in a ring around the central axis of the sound attenuation cylinder.

[0009] Preferably, the motor support is provided with four groups, and the motor supports are uniformly distributed in a ring around the central axis of the motor.

[0010] Preferably, the motor support is a circular tube, both ends of the circular tube are formed with flat tubes, a fastening screw is inserted into the flat tube at the inner end of the motor support, and the fastening screw is screwed and fixed on the ear seat of the motor; the flat tube at the outer end of the motor support is clamped and fixed between the air guide cylinder and the sound attenuation cylinder.

[0011] Preferably, the thickness of the air guide cylinder is greater than the wall thickness of the sound attenuation cylinder.

[0012] The beneficial effects of the utility model lie in:

[0013] The shaft flow fan divides the outer air cylinder into two parts of the air guide cylinder and the sound attenuation cylinder, uses the sound attenuation holes on the sound attenuation cylinder to attenuate and reduce noise, and the air guide cylinder supports the motor and the fan blade on the inner side of the fan; meanwhile, the shaft flow fan is convenient to assemble. BRIEF DESCRIPTION OF DRAWINGS

[0014] Fig. 1 It is a structure schematic view of the utility model from the front view;

[0015] Fig. 2 It is a structure schematic view of the utility model from the bottom view;

[0016] Fig. 3 It is a three-dimensional structure schematic view of the utility model without the protective net;

[0017] Fig. 4 It is a top view structure schematic view of the utility model without the protective net.

[0018] In the drawing: 1, air guide cylinder; 11, connecting edge; 2, motor; 21, ear seat; 3, impeller; 4, sound attenuation cylinder; 41, sound attenuation hole; 42, lower folding edge; 43, upper folding edge; 5, motor support; 6, protective net; 7, reinforcing ring. DETAILED DESCRIPTION

[0019] Embodiment: see Figs. 1 to 4The axial flow fan with the diffusion porous silencing cylinder comprises a guide cylinder 1, a motor 2 and an impeller 3, the impeller 3 is fixed on the rotating shaft of the motor 2, the lower part of the motor 2 and the impeller 3 are inserted into the guide cylinder 1, characterized in that: the upper part of the motor 2 is sleeved with a conical silencing cylinder 4, a plurality of silencing holes 41 are formed on the cylinder wall of the silencing cylinder 4;

[0020] The upper and lower ends of the silencing cylinder 4 are respectively bent to form a horizontal annular upper bending edge 43 and a lower bending edge 42, the upper end of the guide cylinder 1 is bent to form a horizontal annular connecting edge 11, the connecting edge 11 and the lower bending edge 42 are fixedly connected together through a plurality of stud assemblies, the stud assembly is composed of a bolt, a nut and a washer; a plurality of ear seats 21 are formed on the outer wall of the motor 2 housing, a plurality of horizontally inclined motor supports 5 are fixedly connected to the ear seats 21, the outer ends of the motor supports 5 are inserted into the bolts of the stud assemblies and clamped and fixed between the connecting edge 11 and the lower bending edge 42; a plurality of reinforcing rings 7 are inserted into the motor 2, the reinforcing rings 7 are fixedly connected to the motor supports 5, a protective net 6 is arranged above the motor 2, and the outer ring of the protective net 6 is fixedly connected to the upper bending edge 43 of the silencing cylinder 4 through screws.

[0021] The cylinder diameter of the upper end of the silencing cylinder 4 is greater than the cylinder diameter of the lower end of the silencing cylinder 4, and the cylinder diameter of the lower end of the silencing cylinder 4 is consistent with the cylinder diameter of the upper end of the guide cylinder 1;

[0022] The central axis of the silencing cylinder 4, the central axis of the guide cylinder 1, the central axis of the motor 2 and the central axis of the impeller 3 are on the same straight line; the reinforcing rings 7 are provided in two groups, the diameters of the two groups of reinforcing rings 7 are different, but the two groups of reinforcing rings 7 are concentric, and the centers are on the central axis of the guide cylinder 1.

[0023] The silencing holes 41 are annularly and uniformly distributed around the central axis of the silencing cylinder 4.

[0024] The motor supports 5 are provided in four groups and are annularly and uniformly distributed around the central axis of the motor 2; the motor supports 5 are arranged in a spiral around the central axis of the motor 2, and the motor 2 works to generate a rotary torque, so that the motor supports 5 are arranged in a spiral shape to resist the rotary torque and improve the overall strength of the axial flow fan.

[0025] The motor supports 5 adopt circular tubes, the two ends of the circular tubes are respectively formed with flat tubes, the flat tube on the inner end of the motor support 5 is inserted with a fastening screw, and the fastening screw is screw-connected and fixed to the ear seat 21 of the motor 2; the flat tube on the outer end of the motor support 5 is clamped and fixed between the guide cylinder 1 and the silencing cylinder 4, the motor support 5 adopts a circular tube, which has small air flow resistance, and the two ends can be inclined to become a flat tube structure, which is also convenient for connection with the motor 2 and the guide cylinder 1.

[0026] The thickness of the air guide cylinder 1 is greater than the wall thickness of the sound elimination cylinder 4, the main support body of the motor 2 and the impeller 3 is the air guide cylinder 1, when the axial flow fan is installed and connected, the axial flow fan is connected with other components (such as a ventilation duct) through the air guide cylinder 1, therefore the air guide cylinder 1 requires a certain thickness to ensure the strength of the axial flow fan; and the sound elimination cylinder 4 does not require the same thickness as the air guide cylinder 1, that is, the overall weight of the fan can be reduced, and the manufacturing cost can be saved.

[0027] Working principle: the structure is an axial flow fan with a diffusion porous sound elimination cylinder, the main technical point of the axial flow fan is embodied on the outer cylinder structure of the axial flow fan, the outer cylinder is divided into upper and lower two parts, which are the sound elimination cylinder 4 and the air guide cylinder 1 respectively, the motor 2 in the outer cylinder can be arranged between the sound elimination cylinder 4 and the air guide cylinder 1 through a motor support and can be installed on the air guide cylinder 1 through a bolt assembly, at the same time, the sound elimination cylinder 4 can be installed and connected with the air guide cylinder 1 through the same bolt assembly, to form the outer cylinder structure, which is convenient and fast to assemble.

[0028] The air guide cylinder 1 is the main carrier of the motor 2 and the impeller 3 on the inner side, and has no slot hole structure with sound elimination holes, so that the strength of the air guide cylinder 1 is not cut, and the loss of air inlet wind pressure and air inlet air volume caused by the slot hole structure is avoided.

[0029] The sound elimination cylinder 4 is designed as a conical diffusion cylinder matched with the annular sound elimination holes 41, which can effectively realize sound elimination and noise reduction.

[0030] The embodiments are used to exemplarily illustrate the utility model, and are not used to limit the utility model. Any person skilled in the art can modify the embodiments without departing from the spirit and scope of the utility model, therefore the protection scope of the utility model should be as listed in the claims of the utility model.

Claims

1. An axial flow fan with a diffuser-type porous silencer, comprising a guide tube (1), a motor (2), and an impeller (3), wherein the impeller (3) is fixedly connected to the rotating shaft of the motor (2), and the lower part of the motor (2) and the impeller (3) are inserted into the guide tube (1), characterized in that: A conical muffler (4) is fitted on the upper part of the motor (2), and several muffler holes (41) are formed on the wall of the muffler (4); The upper and lower ends of the silencer (4) are bent into horizontal annular upper folded edge (43) and lower folded edge (42), respectively. The upper end of the air guide tube (1) is bent into a horizontal annular connecting edge (11). The connecting edge (11) and the lower folded edge (42) are fixedly connected together by several stud assemblies. The stud assembly consists of bolts, nuts and washers. Several lugs (21) are formed on the outer wall of the motor (2) housing. Several horizontally inclined motor brackets (5) are fixed on the lugs (21). The outer end of the motor bracket (5) is inserted into the bolt of the stud assembly and clamped and fixed between the connecting edge (11) and the lower folded edge (42). Several reinforcing rings (7) are inserted into the motor (2). The reinforcing rings (7) are fixed on the motor bracket (5). A protective net (6) is provided above the motor (2). The outer ring of the protective net (6) is fixedly connected to the upper folded edge (43) of the silencer (4) by screws.

2. The axial flow fan with diffuser-type porous silencer according to claim 1, characterized in that: The diameter of the upper end of the silencer (4) is larger than the diameter of the lower end of the silencer (4), and the diameter of the lower end of the silencer (4) is the same as the diameter of the upper end of the air guide (1). The central axis of the silencer (4), the central axis of the air guide (1), the central axis of the motor (2), and the central axis of the impeller (3) are on the same straight line.

3. An axial flow fan with a diffuser-type porous silencer according to claim 2, characterized in that: The silencing holes (41) are evenly distributed in a ring around the central axis of the silencing cylinder (4).

4. An axial flow fan with a diffuser-type porous silencer according to claim 2, characterized in that: The motor bracket (5) is provided in four sets, and the motor bracket (5) is evenly distributed in a ring around the central axis of the motor (2).

5. An axial flow fan with a diffuser-type porous silencer according to claim 4, characterized in that: The motor bracket (5) is made of a round tube, and flat tubes are formed at both ends of the round tube. Fastening screws are inserted into the flat tubes at the inner end of the motor bracket (5), and the fastening screws are screwed and fixed to the lugs (21) of the motor (2). The flat tubes at the outer end of the motor bracket (5) are clamped and fixed between the air guide tube (1) and the silencer tube (4).

6. An axial flow fan with a diffuser-type porous silencer according to claim 1, characterized in that: The thickness of the air guide tube (1) is greater than the wall thickness of the silencer tube (4).

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