Noise reduction type fan

Abstract

The utility model discloses a noise reduction type fan, relates to the technical field of fans, and adopts the technical scheme that the noise reduction type fan comprises a fan body, a silencing device is arranged on the fan body, the silencing device comprises a shell, a sound absorption cotton sliver and a pressing assembly are arranged in the shell, and the pressing assembly comprises a plurality of pressing feet. The presser foot is used for pressing the sound-absorbing cotton slivers on the inner wall of the shell, and the presser foot can extend out of or retract into the shell. According to the noise reduction type draught fan, when the sound absorption cotton slivers need to be replaced, the pressing feet only need to be pulled forcibly and pulled out of the shell, pressing and limiting of the sound absorption cotton slivers can be relieved, and therefore the sound absorption cotton slivers can be directly pulled out of the interior of the shell to be detached, and then new sound absorption cotton slivers are inserted into the shell and pushed back to the pressing feet to be limited. And the operation is convenient, time-saving and labor-saving.

Description

Technical Field

[0001] This utility model relates to the field of fan technology, specifically a noise-reducing fan. Background Technology

[0002] A fan is a machine that uses input mechanical energy to increase gas pressure and discharge gas; it is a type of driven fluid machinery.

[0003] Existing fans are mainly composed of impellers, casings, motors and other components. When the motor starts, it drives the impeller to rotate, so that the gas enters the impeller axially from the air inlet. The gas energy is increased by the pushing of the blades on the impeller, and then flows into the guide vanes. The guide vanes deflect the airflow into axial flow and guide the gas into the diffuser, further converting the gas kinetic energy into pressure energy, and finally introducing it into the working pipeline.

[0004] When a fan is operating, it generates significant noise at the air inlet. Therefore, operators typically install silencers on the fan to reduce noise before use. Existing fan silencers are usually tubular or cylindrical, with an internal sound-absorbing structure, generally made of sound-absorbing cotton. This cotton is usually composed of multiple layers of fiber or foam material, offering good elasticity and toughness, and containing numerous tiny pores. When sound waves pass through the cotton, these pores scatter and absorb the sound, reducing reflection and achieving a good sound absorption and noise reduction effect. Currently, the sound-absorbing cotton is usually fixed to the inner wall of the silencer by adhesive bonding. While this provides good connection strength, disassembly is difficult. Furthermore, when the sound-absorbing cotton ages and its sound absorption effect decreases after long-term use, replacement is troublesome, time-consuming, and labor-intensive. Utility Model Content

[0005] The purpose of this invention is to provide a noise-reducing fan to solve the above-mentioned problems.

[0006] This utility model achieves the above-mentioned objective through the following technical solution: a noise-reducing fan, including a fan body, a noise-reducing device provided on the fan body, the noise-reducing device including a housing, a sound-absorbing cotton strip and a pressing assembly provided inside the housing, the pressing assembly including a plurality of pressing feet, the pressing feet being used to press the sound-absorbing cotton strip onto the inner wall of the housing, the pressing feet being able to extend or retract into the housing.

[0007] As a further feature of this invention, the clamping assembly also includes a cylinder and a telescopic rod slidably connected inside the cylinder, and the pressure foot is fixedly connected to the telescopic rod.

[0008] As a further feature of this invention, a vertical groove is provided on the inner wall of the cylinder, and an annular groove communicating with the groove is provided on the inner wall of the cylinder in the circumferential direction. A slider is provided on the telescopic rod and is slidably connected inside the groove. The slider is used to engage with the annular groove.

[0009] As a further feature of this invention, the presser foot includes a support bar fixedly connected to the telescopic rod, and the support bar is provided with a pressure plate for contacting the sound-absorbing cotton strip, the pressure plate being perpendicular to the support bar.

[0010] As a further feature of this invention, a limiting piece is provided on the pressure plate, and the limiting piece is perpendicular to the pressure plate.

[0011] As a further feature of this invention, a support is provided inside the housing, and the cylindrical body is fixedly connected to the support. The support is used to contact the sound-absorbing cotton strip.

[0012] As a further feature of this utility model, the housing is provided with a plurality of connecting rings, and the fan body is provided with a plurality of connecting holes that match the connecting rings.

[0013] As a further feature of this invention, the housing is made of stainless steel.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] When the sound-absorbing cotton strip needs to be replaced, this utility model only requires pulling the presser foot forcefully to pull it out of the shell, which releases the pressure limit on the sound-absorbing cotton strip, allowing the sound-absorbing cotton strip to be pulled directly out of the shell for disassembly. Then, the new sound-absorbing cotton strip is inserted, and the presser foot is pushed back to limit it. The operation is convenient, time-saving and labor-saving. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the silencer device in this utility model;

[0018] Figure 3 This is a schematic diagram of the telescopic rod and pressure foot in this utility model;

[0019] Figure 4 This is a half-sectional view of the cylinder body of this utility model.

[0020] Reference numerals in the attached drawings: 1. Fan body; 2. Shell; 3. Sound-absorbing cotton strip; 4. Cylinder; 5. Telescopic rod; 6. Slide groove; 7. Annular groove; 8. Slider; 9. Support bar; 10. Pressure plate; 11. Limiting plate; 12. Bracket; 13. Connecting ring. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figure 1 , Figure 2 As shown, a noise-reducing fan includes a fan body 1. A silencing device is installed on the fan body 1, comprising a housing 2 made of stainless steel, which has high strength and hardness, is not easily corroded, and has good durability. Inside the housing 2, sound-absorbing cotton strips 3 and a clamping assembly are installed. When the sound-absorbing cotton strips 3 are inserted into the housing 2, they need to be rolled into a cylindrical shape to fit against the inner wall of the housing 2. The clamping assembly includes several pressure feet used to press the sound-absorbing cotton strips 3 firmly against the inner wall of the housing 2. The pressure feet can extend or retract into the housing 2. Therefore, when it is necessary to install the sound-absorbing cotton strips 3, the pressure feet can be pushed out of the housing 2 first, then the sound-absorbing cotton strips 3 can be rolled into a cylindrical shape and inserted. Inside the housing 2, the sound-absorbing cotton strip 3 is pressed against the inner wall of the housing 2. Finally, the presser foot is pushed back into the housing 2, which compresses the sound-absorbing cotton strip 3, causing it to deform elastically and firmly press it against the inner wall of the housing 2. This allows the sound-absorbing cotton strip 3 to perform its sound absorption and noise reduction effect, ensuring the noise reduction function of the silencing equipment. When the sound-absorbing cotton strip 3 needs to be replaced, simply pull the presser foot out of the housing 2 to release the pressure limit on the sound-absorbing cotton strip 3, allowing it to be pulled directly out of the housing 2 for disassembly. Then, insert the new sound-absorbing cotton strip 3 and push the presser foot back to limit its position. The operation is convenient, time-saving, and labor-saving.

[0023] Please see Figure 2-4As shown, the clamping assembly also includes a cylinder 4 and a telescopic rod 5 slidably connected inside the cylinder 4. The pressure foot is fixedly connected to the telescopic rod 5, allowing the telescopic rod 5 to extend or retract inside the cylinder 4, thereby causing the pressure foot to extend or retract inside the housing 2. This limits or releases the sound-absorbing cotton strip 3, making operation convenient. A vertical groove 6 is provided on the inner wall of the cylinder 4, and a circumferential annular groove 7 communicating with the groove 6 is provided on the inner wall of the cylinder 4. A slider 8 is slidably connected to the inside of the groove 6 on the telescopic rod 5. Block 8 is used to engage with the annular groove 7. When the presser foot is pushed back into the housing 2 and the sound-absorbing cotton strip 3 is pressed against the inner wall of the housing 2 by the presser foot, the telescopic rod 5 will retract into the cylinder 4. This causes the slider 8 to slide to the point where the slide groove 6 connects with the annular groove 7. Then, the telescopic rod 5 can be rotated so that the slider 8 engages with the annular groove 7. By limiting the slider 8 through the annular groove 7, the telescopic rod 5 can be locked inside the cylinder 4, thus fixing the presser foot and improving the installation firmness of the sound-absorbing cotton strip 3 inside the housing 2.

[0024] Please see Figure 2 , Figure 3 As shown, the presser foot includes a support strip 9 fixedly connected to the telescopic rod 5. A pressure plate 10 is provided on the support strip 9 for contacting the sound-absorbing cotton strip 3, and the pressure plate 10 is perpendicular to the support strip 9. When the presser foot is pushed back into the housing 2, the pressure plate 10 will compress the sound-absorbing cotton strip 3, causing it to elastically deform and firmly press it against the inner wall of the housing 2, thus limiting the position of the sound-absorbing cotton strip 3. A limiting piece 11 is provided on the pressure plate 10, and the limiting piece 11 is perpendicular to the pressure plate 10. When the presser foot is pushed back into the housing 2, the pressure plate 10 will compress the sound-absorbing cotton strip 3, while the limiting piece 11 will block the sound-absorbing cotton strip 3, preventing it from coming out of the housing 2, thereby improving the installation firmness of the sound-absorbing cotton strip 3 inside the housing 2. A bracket 12 is provided, and the cylinder 4 is fixedly connected to the bracket 12. The bracket 12 is used to abut against the sound-absorbing cotton strip 3. When the sound-absorbing cotton strip 3 is rolled into a cylinder and inserted into the housing 2, the bracket 12 can block the sound-absorbing cotton strip 3, preventing the sound-absorbing cotton strip 3 from passing out of the housing 2, thus achieving the pre-positioning of the sound-absorbing cotton strip 3 and facilitating subsequent fixing operations. Several connecting rings 13 are provided on the housing 2, and several connecting holes matching the connecting rings 13 are opened on the fan body 1. When it is necessary to install the silencing device onto the fan body 1, the connecting rings 13 can be aligned with the connecting holes, and then the bolts can be passed through the connecting rings 13 and the connecting holes in sequence, and finally the connecting nuts can be tightened, thereby fixing the silencing device onto the fan body 1. The operation is relatively convenient and simple.

[0025] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0026] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A noise-reducing fan, comprising a fan body (1), characterized in that: The fan body (1) is provided with a noise reduction device. The noise reduction device includes a housing (2). The housing (2) is provided with a sound-absorbing cotton strip (3) and a pressing assembly. The pressing assembly includes several pressing feet. The pressing feet are used to press the sound-absorbing cotton strip (3) onto the inner wall of the housing (2). The pressing feet can extend or retract into the housing (2).

2. The noise-reducing fan according to claim 1, characterized in that: The clamping assembly also includes a cylinder (4) and a telescopic rod (5) slidably connected inside the cylinder (4), and the clamping foot is fixedly connected to the telescopic rod (5).

3. The noise-reducing fan according to claim 2, characterized in that: The inner wall of the cylinder (4) is vertically provided with a sliding groove (6), and the inner wall of the cylinder (4) is circumferentially provided with an annular groove (7) communicating with the sliding groove (6). The telescopic rod (5) is provided with a slider (8) that is slidably connected inside the sliding groove (6). The slider (8) is used to be inserted into the annular groove (7).

4. A noise-reducing fan according to claim 3, characterized in that: The presser foot includes a support strip (9) fixedly connected to the telescopic rod (5), and the support strip (9) is provided with a pressure plate (10) for contacting the sound-absorbing cotton strip (3), and the pressure plate (10) is perpendicular to the support strip (9).

5. A noise-reducing fan according to claim 4, characterized in that: A limiting piece (11) is provided on the pressure plate (10), and the limiting piece (11) is perpendicular to the pressure plate (10).

6. A noise-reducing fan according to claim 5, characterized in that: The housing (2) is provided with a bracket (12), and the cylinder (4) is fixedly connected to the bracket (12). The bracket (12) is used to contact the sound-absorbing cotton strip (3).

7. A noise-reducing fan according to claim 5, characterized in that: The housing (2) is provided with several connecting rings (13), and the fan body (1) is provided with several connecting holes that match the connecting rings (13).

8. A noise-reducing fan according to claim 1, characterized in that: The housing (2) is made of stainless steel.

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