Low-vibration-noise volute for small fan

Abstract

The invention relates to the technical field of fan noise reduction, in particular to a low-vibration-noise volute for a small fan. The volute adopts a horizontal mounting mode, and the motor flange is connected with the volute polyurethane flange, so that the transmission of motor vibration to the volute is blocked. Air flow enters the volute from the impeller, then enters the sub air ducts between the flow guide plates, flows between the flow guide plates and is discharged from the outlet of the volute, more sub air duct exhaust air is provided for the air flow, the disorder of the air flow is reduced, and the impact of the air flow on the upper coaming and the lower coaming of the volute is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of fan noise reduction, in particular to a low-vibration and noise volute for a small fan. Background Art

[0002] A fan is a mechanical device for conveying gas. It is widely used in industrial fields such as air conditioning and ventilation, smelting and chemical industry, energy and power, and military fields such as ship-type gas transportation and life support.

[0003] When the fan is running, the vibration generated by the rotation of the motor is transmitted to the volute, causing the volute to vibrate. Excessive vibration will cause fatigue deformation at the connection between the motor and the volute, reducing the service life of the motor and the volute. The airflow impacting the volute wall will also cause the volute to vibrate. The volute vibration will radiate noise to the surrounding space, affecting the work and rest of nearby personnel.

[0004] It can be seen that reducing the vibration of the fan is very important. Summary of the invention

[0005] In order to avoid and overcome the technical problems existing in the prior art, the present invention provides a low-vibration and low-noise volute for a small fan. The present invention can effectively reduce the vibration of the volute and the noise generated by the vibration of the volute.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A low-vibration and noise volute for a small fan comprises a volute, wherein an elastic flange for connecting to a motor flange is coaxially fixedly mounted at the air inlet of the volute, and the volute and the motor flange are indirectly in contact with each other via the elastic flange; a plurality of guide plates are arranged in sequence along a spiral direction of the volute in the volute, and the guide plates are arranged in sequence along a radial direction of the volute to divide a main air duct inside the volute into a plurality of sub-air ducts.

[0008] As a further solution of the present invention: the elastic flange is a polyurethane flange made of polyurethane, and a plurality of first mounting holes and second mounting holes are provided on the polyurethane flange; the first mounting holes and the second mounting holes are both two-stage stepped holes for matching with bolts, and the contraction directions of the first mounting holes and the second mounting holes are opposite to each other.

[0009] As a further solution of the present invention: the first mounting holes and the second mounting holes are evenly distributed in sequence along the circumference of the polyurethane flange, and the first mounting holes and the second mounting holes are arranged in sequence at intervals.

[0010] As a further solution of the present invention: there are 8 first mounting holes and 8 second mounting holes respectively, and the interval between adjacent first mounting holes and second mounting holes is 22.5°.

[0011] As a further solution of the present invention: a stiffness reinforcement block is coaxially inserted in the first mounting hole and the second mounting hole, the stiffness reinforcement block is in the shape of a two-section stepped shaft, and a guide hole for inserting the bolt screw section is coaxially opened at its axis center; the small diameter section of the stiffness reinforcement block is coaxially inserted in the small diameter section of the first mounting hole or the second mounting hole, and the shaft shoulder of the stiffness reinforcement block abuts against the hole shoulder of the first mounting hole or the second mounting hole.

[0012] As a further solution of the present invention: radially outward from the volute, the starting ends of the four guide plates are arranged in sequence along the spiral direction of the volute at 90° difference from the volute tongue, and the terminal ends of the four guide plates all extend to the volute outlet end and are evenly flush with the volute outlet end.

[0013] As a further solution of the present invention: along the radial direction of the volute, the distances between adjacent guide plates are the same.

[0014] As a further solution of the present invention: a plurality of mounting fins are protruding outwards on both sides of each guide plate, and a guide groove for the mounting fins to be inserted and slide to install the guide plate to the corresponding position is formed on the inner wall of the volute.

[0015] As a further solution of the present invention, a certain flow gap is left between the inner walls of the volutes on both sides of each guide plate that are evenly adjacent to each other.

[0016] As a further solution of the present invention: the flow gap is 1 mm.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The volute of the present invention is installed horizontally, and the motor flange is connected to the polyurethane flange of the volute, thereby blocking the transmission of motor vibration to the volute. After the airflow enters the volute from the impeller, it will enter the sub-air duct between the guide plates, flow between the guide plates, and be discharged at the outlet of the volute, providing more sub-air duct exhaust for the wind flow, reducing the disorder of the wind flow, and reducing the impact of the wind flow on the upper and lower panels of the volute.

[0019] 2. A 1mm flow gap is formed between the guide plate and the left and right side plates of the volute. Under the action of the fins, the vibration of the guide plate will not be transmitted too much to the volute, which reduces the vibration of the volute caused by the impact of the airflow. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the volute in the present invention.

[0021] Figure 2 It is a schematic diagram of the assembly structure of the motor flange and the volute in the present invention.

[0022] Figure 3It is a schematic diagram of the assembly structure of the motor flange and the polyurethane flange in the present invention.

[0023] Figure 4 It is a schematic diagram of the cross-sectional structure of the polyurethane flange in the present invention.

[0024] Figure 5 It is a schematic diagram of the assembly structure of the stiffness reinforcement block in the present invention.

[0025] Figure 6 It is a schematic diagram of the front structure of the polyurethane flange in the present invention.

[0026] Figure 7 It is a structural schematic diagram of the guide plate in the present invention.

[0027] Figure 8 It is a schematic diagram of the assembly structure of the guide plate in the present invention.

[0028] In the figure: 1. motor flange; 2. polyurethane flange; 21. first mounting hole; 22. second mounting hole; 23. stiffness reinforcement block; 3. volute; 31. left side plate; 32. right side plate; 33. upper enclosure; 34. lower enclosure; 35. guide plate; 351. installation fin; 4. bolts. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] The low vibration and noise volute structure of the small fan of the present invention is shown in the figure Figure 1 and Figure 2 As shown, it is mainly composed of five parts: the connection between the polyurethane flange 2 and the motor flange 1, the left side plate 31, the right side plate 32, the upper enclosure 33, the lower enclosure 34, the guide plate 35, and the outlet flange. The volute 3 in the present invention is installed horizontally, and the motor flange 1 is connected to the polyurethane flange 2, thereby blocking the transmission of the motor vibration to the volute 3. The arrow in the figure is the direction of the wind flow. After the wind flow enters the volute 3 from the impeller, it will enter the guide plate 35, flow between the guide plates 35, and be discharged at the outlet of the volute 3. It will not impact the upper enclosure 33 and the lower enclosure 34 of the volute 3. The guide plate 35 has a flow gap of 1mm with the left side plate 31 and the right side plate 32 of the volute 3. The vibration of the guide plate 35 will not be transmitted to the volute 3 too much, which reduces the vibration of the volute 3 caused by the impact of the airflow.

[0031] like Figure 3-Figure 6As shown, the polyurethane flange 2 has eight first mounting holes 21 on the front, which are connected to the volute 3 through eight hexagon socket bolts 4. Each first mounting hole 21 has a stainless steel stiffness reinforcement block 23, so that the connection with bolts 4 is firm and reliable. There are also eight second mounting holes 22 on the back of the polyurethane flange 2, which are 22.5° different from the first mounting holes 21 on the front, and are connected to the motor flange 1 through bolts 4. This connection method of two bolts 4 through the polyurethane flange 2 connects the motor and the volute 3, and the motor and the volute 3 flanges are in an insulated state. The motor vibration is well absorbed and blocked by the polyurethane flange 2 and cannot be transmitted to the volute 3, which plays a good vibration reduction role.

[0032] like Figure 7 and Figure 8 As shown, four guide plates 35 are added inside the volute 3, and the gas flows in the guide plates 35 without directly impacting the upper and lower panels 33 and 34. The starting end of the first guide plate 35 starts from the tongue of the volute 3, and its position is 90° different from that of the second guide plate 35. By analogy, the starting ends of the four guide plates 35 are 90° different in sequence, and the four guide plates 35 are flush at the outlet. In addition, there is a 1mm flow gap between the guide plate 35 and the side plate of the volute 3, so that the vibration of the guide plate 35 will not be transmitted to the volute 3 too much, thereby achieving the purpose of vibration reduction. There are some symmetrical mounting fins 351 on both sides of the guide plate 35, and these mounting fins 351 are slidably connected with the guide grooves on the left side plate 31 and the right side plate 32. Since the contact surface between the mounting fins 351 and the left side plate 31 and the right side plate 32 is very small, the vibration transmission is limited, the vibration of the volute 3 is very low, and the noise radiated by the volute 3 to the surrounding is also very small.

[0033] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A low vibration and noise volute for a small fan, characterized in that: The invention comprises a volute (3), wherein an elastic flange for connecting to a motor flange (1) is coaxially fixedly mounted at an air inlet of the volute (3), and the volute (3) and the motor flange (1) are indirectly in contact with each other via the elastic flange; a plurality of guide plates (35) are arranged in sequence along a spiral direction of the volute (3) inside the volute (3), and each guide plate (35) is arranged in sequence along a radial direction of the volute (3) to divide a main air duct inside the volute (3) into a plurality of sub-air ducts.

2. A low vibration and noise volute for a small fan according to claim 1, characterized in that: The elastic flange is a polyurethane flange (2) made of polyurethane, and a plurality of first mounting holes (21) and second mounting holes (22) are provided on the polyurethane flange (2); the first mounting holes (21) and the second mounting holes (22) are both two-stage stepped holes for matching with the bolts (4), and the contraction directions of the first mounting holes (21) and the second mounting holes (22) are opposite to each other.

3. A low vibration and noise volute for a small fan according to claim 2, characterized in that: The first mounting holes (21) and the second mounting holes (22) are evenly distributed in sequence along the circumference of the polyurethane flange (2), and the first mounting holes (21) and the second mounting holes (22) are arranged in sequence at intervals.

4. The low vibration and noise volute for a small fan according to claim 3, characterized in that: There are eight first mounting holes (21) and eight second mounting holes (22), and the interval between adjacent first mounting holes (21) and second mounting holes (22) is 22.5°.

5. A low vibration and noise volute for a small fan according to claim 4, characterized in that: A rigidity reinforcement block (23) is coaxially inserted in both the first mounting hole (21) and the second mounting hole (22); the rigidity reinforcement block (23) is in the shape of a two-stage stepped shaft, and a guide hole for inserting a screw rod section of a bolt (4) is coaxially opened at its axis; the small diameter section of the rigidity reinforcement block (23) is coaxially inserted in the small diameter section of the first mounting hole (21) or the second mounting hole (22), and the shaft shoulder of the rigidity reinforcement block (23) abuts against the hole shoulder of the first mounting hole (21) or the second mounting hole (22).

6. A low vibration and noise volute for a small fan according to any one of claims 1 to 5, characterized in that: Radially outward from the volute (3), the starting ends of the four guide plates (35) are arranged in sequence along the spiral direction of the volute (3) at 90° intervals from the volute tongue of the volute (3), and the terminal ends of the four guide plates (35) all extend to the outlet end of the volute (3) and are evenly flush with the outlet end of the volute (3).

7. A low vibration and noise volute for a small fan according to claim 6, characterized in that: Along the radial direction of the volute (3), the spacing between adjacent guide plates (35) is the same.

8. A low vibration and noise volute for a small fan according to claim 7, characterized in that: A plurality of mounting fins (351) are protruding outwards on both sides of each guide plate (35), and a guide groove for the mounting fins (351) to be inserted and slided to install the guide plate (35) at a corresponding position is provided on the inner wall of the volute (3).

9. A low vibration and noise volute for a small fan according to claim 8, characterized in that: A certain flow gap is left between the inner walls of the volutes (3) adjacent to each other on both sides of each guide plate (35).

10. A low vibration and noise volute for a small fan according to claim 9, characterized in that: The flow gap is 1mm.

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