Outdoor rainproof low-noise axial flow fan for transformer substation

Abstract

The utility model belongs to the field of axial flow fans, and particularly relates to an outdoor rainproof low-noise axial flow fan for a transformer substation, which comprises a motor, an impeller, a motor bracket, an air duct, a flange, a shell, a sound insulation felt layer, a rubber and plastic sound insulation cotton layer, a polyurethane cotton layer, a galvanized punched plate, a sound absorption sheet, a self-drooping shutter, a keel, a limiting corner connector and a connecting sheet. The impeller is of a structure with the middle expanded and the two sides narrow, the cross section is in an S-shaped twisted shape, and the impeller is connected with the motor and fixed to the motor support. And the motor bracket is welded on the air duct and is wrapped in the shell. The two circles of keels surround and are welded to the inner wall of the shell, and meanwhile the keels are used for fixing the galvanized punched plate. And the sound absorption sheet is wedge-shaped and is fixedly fixed on the galvanized punched plate through the limiting corner connector and the connecting sheet. The self-drooping shutter is provided with a plurality of shutter blades provided with rainproof ventilation holes, and the maximum opening angle is 80 degrees. The utility model discloses rainproof, simple structure, convenient to dismantle and install, can effectively reduce the noise more than 8dB.

Description

Technical Field

[0001] The utility model relates to the field of axial flow fans, in particular to an outdoor rainproof low-noise axial flow fan for a transformer substation. Background Art

[0002] Axial flow fans are widely used. They are fans whose airflow direction is in the same direction as the axis of the fan blades. For example, electric fans and air conditioner outdoor fans are fans that run in an axial flow mode. They are called "axial flow" because the air flows parallel to the fan axis. Axial flow fans are usually used in situations where the flow rate requirements are high and the pressure requirements are low. Axial flow fans are fixed in place and move the air.

[0003] In Chinese patent CN202123046583.6, the utility model discloses a low-noise axial flow fan, including: a fan blade, a motor and a cylinder, the motor is arranged in the cylinder, the output end of the motor is connected to the fan blade, and a reinforcement ring is axially distributed on the inner wall of the cylinder, and an inner concave ring groove is formed between two adjacent reinforcement rings, and a noise reduction layer is arranged in the inner concave ring groove. The utility model has a novel structure, the reinforcement ring improves the structural strength of the cylinder, is not easy to deform, and has a long service life, and the noise reduction layer effectively absorbs the noise generated when the fan blade is running, reducing the noise from propagating outward.

[0004] The axial flow fans currently on the market have low air volume and still make too much noise after noise reduction treatment. At the same time, axial flow fans used outdoors lack effective rain protection, causing water to enter the inner shell of the axial flow fan and reduce its service life.

[0005] Therefore, in order to solve the above problems, an outdoor rainproof low-noise axial flow fan for a substation is proposed. Utility Model Content

[0006] In order to make up for the shortcomings of the existing technology, the problem of low air volume of axial flow fans on the market, excessive noise after noise reduction treatment, and lack of effective rain protection function for outdoor axial flow fans is solved, which causes water to enter the inner shell of the axial flow fan and thus reduces the service life.

[0007] The technical solution adopted by the utility model to solve its technical problems is: the utility model describes an outdoor rainproof low-noise axial flow fan for a substation, comprising a motor, the top of the motor is rotatably connected to an impeller, and a wind tube is arranged on the side of the impeller, one side of the motor is fixedly connected to a motor bracket, and the other side of the motor bracket is fixedly connected to a shell, the side of the shell is fixedly connected to a flange, and the interior of the shell is fixedly connected to a sound insulation felt layer, and the interior of the sound insulation felt layer is fixedly connected to a rubber and plastic sound insulation cotton layer, the interior of the rubber and plastic sound insulation cotton layer is fixedly connected to a polyurethane cotton layer, and the interior of the polyurethane cotton layer is fixedly connected to a galvanized perforated plate, and the side of the galvanized perforated plate is provided with a connecting piece, the interior of the connecting piece is provided with screws, and the side of the connecting piece is fixedly connected to a self-hanging louver assembly, and the side of the self-hanging louver assembly is provided with a sound absorbing piece, the side of the shell is fixedly connected to a keel, and the top of the keel is fixedly connected to a limited position angle code.

[0008] Preferably, the impeller is set at equal angles with respect to the vertical center axis of the motor, and the cross-section of the impeller is set in an S-shaped twisted shape, and the ratio of the narrowest part of the impeller to the widest part of the impeller is set to: 1:8, the impeller and the motor form a rotating structure, and the motor and the motor bracket are integrated, and the motor bracket and the wind tube are integrated.

[0009] Preferably, the keel is arranged at equal angles with respect to the inner wall of the shell, and the galvanized perforated plate and the keel form a threaded structure.

[0010] Preferably, the shape of the sound absorbing sheet is set to be a wedge shape, and a galvanized punching sheet polyurethane cotton layer is arranged inside the sound absorbing sheet, and the bulk density of the polyurethane cotton layer is not less than 40kg / m 3 , and the thickness shall not be less than 50mm.

[0011] Preferably, the flange and the shell are integrated into one piece, and the shell is made of steel plate.

[0012] Preferably, the self-hanging louver assembly includes screw holes, an outer frame, louvers, a cross bar, a limiting pin, a buffer pad, and rainproof ventilation holes. A screw hole is opened on one side of the outer frame, and a cross bar is rotatably connected to the inside of the outer frame, and the louvers are fixedly connected to the side of the cross bar. A rainproof ventilation hole is opened on one side of the louver, and a limiting pin is set on the other side of the louver, and a buffer pad is fixedly connected to the bottom end of the louver.

[0013] Preferably, the outer frame forms a threaded structure with the outer shell through screw holes, the louver is made of lightweight aluminum sheet material, the rainproof ventilation holes are arranged at equal intervals on the louver, and the buffer pad is made of fire-resistant cotton material.

[0014] The utility model is beneficial in that:

[0015] 1. The utility model can absorb and block the noise generated by the axial flow fan through the structural setting of the sound insulation felt layer, rubber and plastic sound insulation cotton layer, polyurethane cotton layer, galvanized perforated plate, and sound absorbing sheet. When the air flows through, the noise sound waves collide with the sound absorbing sheet, and the sound waves make the air in the pores of the perforated plate vibrate, and rub against the pore walls to convert into heat energy; similarly, the sound waves pass through the inside of the sound absorbing sheet, causing the air in the pores inside the polyurethane cotton layer to vibrate, and rub against the pore walls, thereby converting the sound energy into heat energy, which can effectively reduce the eddy current noise generated by the impeller and the noise of the axial flow fan. Self-hanging louvers are provided to prevent rainwater from drifting into the pipe; when the blades are not opened, the hot air in the room can be discharged to the outside through the rainproof ventilation holes. When the louver blades are opened and then closed, the buffer pads at the end prevent the impact noise between the louver blades;

[0016] 2. The utility model can prevent rainwater from drifting into the pipe by providing a self-hanging louver assembly; when the louvers are not opened, the hot air in the room can be discharged to the outside through the rainproof vents. When the louvers are opened and closed, the buffer pads at the end prevent the louvers from generating collision noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 It is a top view of the structure of the utility model;

[0019] Figure 2 It is a structural side view of the utility model;

[0020] Figure 3 It is a cross-sectional view of the utility model along line AA;

[0021] Figure 4 It is a BB line cross-sectional view of the utility model;

[0022] Figure 5 It is a front view of the self-hanging shutter of the utility model;

[0023] Figure 6 It is a side view of the self-hanging shutter of the utility model;

[0024] Figure 7 It is a partial enlarged view of D of the utility model;

[0025] Figure 8 It is a structural schematic diagram of the louver blades of the utility model.

[0026] In the figure: 1. Motor; 2. Impeller; 3. Motor bracket; 4. Flange; 5. Casing; 6. Sound insulation felt layer; 7. Rubber-plastic sound insulation cotton layer; 8. Polyurethane cotton layer; 9. Galvanized perforated plate; 10. Self-hanging louver assembly; 11. Sound-absorbing sheet; 12. Air duct; 13. Keel; 14. Limiting angle code; 15. Screw; 16. Connecting piece; 101. Screw hole; 102. Outer frame; 103. Louver blade; 104. Cross bar; 105. Limiting nail; 106. Buffer pad; 107. Rainproof ventilation hole. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] Embodiment 1

[0029] See also Figures 1 to 8 The outdoor rainproof low-noise axial flow fan of a substation shown in the figure comprises a motor 1, the top of the motor 1 is rotatably connected to an impeller 2, and a wind tube 12 is arranged on the side of the impeller 2, one side of the motor 1 is fixedly connected to a motor bracket 3, and the other side of the motor bracket 3 is fixedly connected to a shell 5, the side of the shell 5 is fixedly connected to a flange 4, and the inside of the shell 5 is fixedly connected to a sound insulation felt layer 6, and the inside of the sound insulation felt layer 6 is fixedly connected to a rubber-plastic sound insulation cotton layer 7, the inside of the rubber-plastic sound insulation cotton layer 7 is fixedly connected to a polyurethane cotton layer 8, and the inside of the polyurethane cotton layer 8 is fixedly connected to a galvanized perforated plate 9, and a connecting piece 16 is arranged on the side of the galvanized perforated plate 9, a screw 15 is arranged inside the connecting piece 16, and a self-hanging louver assembly 10 is fixedly connected to the side of the connecting piece 16, and the self-hanging louver assembly 10 is fixedly connected to the side of the connecting piece 16. A sound-absorbing sheet 11 is arranged on the side of the blade assembly 10, a keel 13 is fixedly connected to the side of the outer shell 5, and a limited angle code 14 is fixedly connected to the top of the keel 13; the impeller 2 is arranged at equal angles with respect to the vertical center axis of the motor 1, and the cross section of the impeller 2 is arranged in an S-shaped twisted shape, and the ratio of the narrowest part of the impeller 2 to the widest part of the impeller 2 is set to 1:8, the impeller 2 and the motor 1 form a rotating structure, and the motor 1 and the motor bracket 3 are integrated, and the motor bracket 3 and the wind tube 12 are integrated; the keel 13 is arranged at equal angles with respect to the inner wall of the outer shell 5, and the galvanized perforated plate 9 and the keel 13 form a threaded structure; the shape of the sound-absorbing sheet 11 is set to be wedge-shaped, and the galvanized perforated plate 9 and the polyurethane cotton layer 8 are arranged inside the sound-absorbing sheet 11, and the bulk density of the polyurethane cotton layer 8 is not less than 40kg / m ３ , and the thickness is not less than 50mm; the flange 4 and the shell 5 are integrated, and the material of the shell 5 is set to be steel plate.

[0030] See also Figures 5 to 8 The shown is an outdoor rainproof low-noise axial flow fan for a substation, wherein the self-hanging louver assembly 10 includes a screw hole 101, an outer frame 102, louvers 103, a cross bar 104, a limiting nail 105, a buffer pad 106, and a rainproof ventilation hole 107. A screw hole 101 is provided on one side of the outer frame 102, and the inner part of the outer frame 102 is rotatably connected to the cross bar 104, and the side of the cross bar 104 is fixedly connected to the louver 103, one side of the louver 103 is provided with a rainproof ventilation hole 107, and the other side of the louver 103 is provided with a limiting nail 105, and the bottom end of the louver 103 is fixedly connected to the buffer pad 106; the outer frame 102 forms a threaded structure with the outer shell 5 through the screw hole 101, the louver 103 is made of a lightweight aluminum sheet, the rainproof ventilation holes 107 are arranged at equal intervals on the louver 103, and the buffer pad 106 is made of a fire-resistant cotton material.

[0031] Working principle: First, turn on the motor 1 to drive the motor 2 to rotate and start to change the air inside the substation. When the impeller 2 rotates, aerodynamic noise is generated nearby. The number of impellers 2 is ≥4, which is an aluminum die-casting. The impeller 2 is bulging in the middle and narrow on both sides. The cross section is S-shaped and twisted. The ratio of the narrowest to the widest part is 1:8, which strengthens the mechanical strength of the impeller 2 and effectively reduces the instantaneous noise value of breaking the airflow; the impeller 2 is connected to the motor 1 as a whole and fixed on the motor bracket 3. The motor bracket 3 is welded on the circular wind tube 12, which is firm and reliable to ensure the stability of the impeller during operation. When the impeller 2 rotates, aerodynamic noise is generated in the gap of the polyurethane cotton layer 8, which makes the air move back and forth. During the movement, due to the viscosity of the air, corresponding viscous resistance will be generated, so that the sound wave energy is continuously converted into heat energy, thereby attenuating the sound. In addition, the sound wave is transmitted to the outside world through the rubber and plastic sound insulation cotton layer 7, the sound insulation felt layer 6, and the outer shell 5 in turn, which can effectively reduce the amount of noise transmitted to the outside world. At the same time, when the airflow flows through the sound-absorbing sheet 11, the noise collides with the sound-absorbing sheet and generates friction, which is converted into heat energy, which can effectively reduce the eddy current noise generated by the impeller. When it rains, the self-hanging louver assembly 10 will not close under the action of the limit nail 105, and rainwater flows into the ground from the louver blades 103. There are several rainproof ventilation holes 107 on the louver blades 103. When the airflow is large, the rainproof ventilation holes 107 can play the same sound-absorbing function as the galvanized perforated plate 9; when the louver blades 103 are not opened, the indoor hot air can be discharged to the outside; in addition, the end of the louver blades 103 is attached with a buffer pad 106, so that the louver blades 103 do not generate collision noise when they are closed, and the overall noise can be effectively reduced by 8-15dB.

[0032] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A rainproof low-noise axial flow fan for outdoor substations. Features: The invention comprises a motor (1), the top of the motor (1) is rotatably connected to an impeller (2), and a fan (12) is arranged on the side of the impeller (2), one side of the motor (1) is fixedly connected to a motor bracket (3), and the other side of the motor bracket (3) is fixedly connected to a housing (5), the side of the housing (5) is fixedly connected to a flange (4), and the interior of the housing (5) is fixedly connected to a sound insulation felt layer (6), and the interior of the sound insulation felt layer (6) is fixedly connected to a rubber-plastic sound insulation cotton layer (7), and the interior of the rubber-plastic sound insulation cotton layer (7) is fixedly connected to A polyurethane cotton layer (8) is provided, and a galvanized perforated plate (9) is fixedly connected inside the polyurethane cotton layer (8), and a connecting piece (16) is arranged on the side of the galvanized perforated plate (9), a screw (15) is arranged inside the connecting piece (16), and a self-hanging louver assembly (10) is fixedly connected to the side of the connecting piece (16), and a sound-absorbing sheet (11) is arranged on the side of the self-hanging louver assembly (10), and a keel (13) is fixedly connected to the side of the shell (5), and a limited position angle code (14) is fixedly connected to the top of the keel (13).

2. According to claim 1, a substation outdoor rainproof low-noise axial flow fan, Features: The impeller (2) is arranged at equal angles with respect to the vertical center axis of the motor (1), and the cross section of the impeller (2) is arranged in an S-shaped twisted shape, and the ratio of the narrowest part of the impeller (2) to the widest part of the impeller (2) is set to 1:8, the impeller (2) and the motor (1) form a rotating structure, and the motor (1) and the motor bracket (3) are arranged in an integrated manner, and the motor bracket (3) and the wind tube (12) are arranged in an integrated manner.

3. According to claim 1, a substation outdoor rainproof low-noise axial flow fan, Features: The keel (13) is arranged at equal angles with respect to the inner wall of the outer shell (5), and the galvanized perforated plate (9) and the keel (13) form a threaded structure.

4. According to claim 1, a substation outdoor rainproof low-noise axial flow fan, Features: The shape of the sound absorbing sheet (11) is set to be a wedge shape, and a galvanized punching plate (9) and a polyurethane cotton layer (8) are arranged inside the sound absorbing sheet (11), and the bulk density of the polyurethane cotton layer (8) is not less than 40 kg / m 3 , and the thickness shall not be less than 50mm.

5. According to claim 1, a substation outdoor rainproof low-noise axial flow fan, Features: The flange (4) and the outer shell (5) are integrally arranged, and the outer shell (5) is made of a steel plate.

6. According to claim 1, a substation outdoor rainproof low-noise axial flow fan, Features: The self-hanging shutter assembly (10) comprises a screw hole (101), an outer frame (102), a shutter blade (103), a cross bar (104), a limiting pin (105), a buffer pad (106), and a rainproof ventilation hole (107); a screw hole (101) is provided on one side of the outer frame (102); the inner part of the outer frame (102) is rotatably connected to the cross bar (104); the side of the cross bar (104) is fixedly connected to the shutter blade (103); a rainproof ventilation hole (107) is provided on one side of the shutter blade (103); a limiting pin (105) is provided on the other side of the shutter blade (103); and the bottom end of the shutter blade (103) is fixedly connected to the buffer pad (106).

7. According to claim 6, a substation outdoor rainproof low-noise axial flow fan, Features: The outer frame (102) forms a threaded structure with the outer shell (5) through the screw hole (101); the material of the louver (103) is set to be a lightweight aluminum sheet material; the rainproof ventilation holes (107) are arranged at equal intervals on the louver (103); and the material of the buffer pad (106) is set to be a fire-resistant cotton material.

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