Low-noise dust collection volute fan for saw bench

Abstract

The invention discloses a low-noise dust collection volute fan for a saw bench. The low-noise dust collection volute fan comprises a volute-shaped outer shell and a motor installed on the side edge of the outer shell, an impeller is installed on a rotating shaft of the motor and located in the outer shell, an inner shell is installed in the outer shell, an air cavity is formed between the outer shell and the inner shell, and the air cavity is filled with sound absorption cotton; the inner shell is provided with an exhaust port, a flow guide plate matched with the exhaust direction of the exhaust port is arranged at the joint of the lower side of the exhaust port and the interior of the inner shell, outlet air flow generated when the impeller rotates is exhausted through the exhaust port, meanwhile, the impeller rotates to generate a separation vortex, and the outlet air flow and the separation vortex are separated through the flow guide plate. The situation that outlet air flow collides with separation vortexes is avoided, so that vibration and pulsation of the vortexes are reduced, noise is reduced, meanwhile, noise is absorbed and isolated through the air cavity and the sound absorption cotton in the air cavity, transmission of the noise is further reduced, and therefore the working noise of the fan is effectively reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to a saw bench, in particular to a low-noise dust suction volute fan for a saw bench. BACKGROUND

[0002] The volute fan is a device that discharges air inside to the direction of the air outlet through high-speed rotation of the impeller, and replenishes air through the side wall of the volute. During the high-speed rotation of the impeller, a certain amount of separation vortex is generated on the surface of the impeller. The separation vortex is usually unstable, and it will continuously rotate, stretch and deform. When the air flow flowing to the air outlet hits these unstable vortices, it will cause vibration and pulsation of the vortices, thereby generating noise. SUMMARY

[0003] In order to overcome the shortcomings of the prior art, the present application provides a low-noise dust suction volute fan for a saw bench.

[0004] The technical scheme adopted by the present application to solve its technical problems is: A low-noise dust suction volute fan for a saw bench, comprising a volute-shaped outer shell and a motor installed on the side of the outer shell, a rotating shaft of the motor is provided with an impeller, the impeller is located inside the outer shell, an inner shell is installed in the outer shell, an air cavity is formed between the outer shell and the inner shell, and sound-absorbing cotton is filled in the air cavity; the inner shell is provided with an air outlet, and a guide plate corresponding to the air outlet is arranged at the connection between the lower side of the air outlet and the inner side of the inner shell.

[0005] The inner side of the outer shell is provided with a plurality of concentric circular grooves, and the sound-absorbing cotton is filled in the concentric circular grooves.

[0006] The end of the guide plate extends to the side away from the air flow of the air outlet, and the side surface of the extension part has a gap with the outer side of the impeller.

[0007] The size of the gap is 0.5-2mm.

[0008] The extension part is an arc-shaped structure, which is adapted to the outer diameter of the impeller.

[0009] A sleeving part is arranged on the outer shell corresponding to the air outlet, and the sleeving part is sleeved on the outer side of the air outlet.

[0010] A quick release connector is installed at the end of the air outlet.

[0011] The outer side of the exhaust port end is provided with at least two first protruding parts arranged along the circumference and away from the center of the circle, the quick release connector is provided with a mounting cavity, the end of the mounting cavity is provided with a second protruding part corresponding to the first protruding part in the direction of the center of the circle, the second protruding parts are formed with an inner recess between them, the first protruding part is inserted into the mounting cavity through the inner recess, and rotation makes the side surface of the first protruding part abut against the side surface of the second protruding part.

[0012] The side wall of the outer shell body is provided with an air inlet, and the air inlet is provided with a connecting elbow.

[0013] The motor is a brushless motor.

[0014] The beneficial effects of the present application are as follows: a low-noise dust absorption volute fan for a saw bench, comprising a volute-shaped outer shell body and a motor mounted on the side of the outer shell body, a rotating shaft of the motor is provided with an impeller, the impeller is located in the inner part of the outer shell body, an inner shell body is mounted in the outer shell body, an air cavity is formed between the outer shell body and the inner shell body, and sound-absorbing cotton is filled in the air cavity; the inner shell body is provided with an exhaust port, a guide plate corresponding to the exhaust direction of the exhaust port is arranged at the connecting part between the lower side of the exhaust port and the inner part of the inner shell body, when the impeller rotates, the exhaust airflow generated by the rotation of the impeller is discharged through the exhaust port, at the same time, the separation vortex generated by the rotation of the impeller is separated from the exhaust airflow by the guide plate, so that the collision between the exhaust airflow and the separation vortex is avoided, thereby reducing the vibration and pulsation caused by the vortex and reducing the generation of noise, at the same time, the noise is absorbed and isolated by the air cavity and the sound-absorbing cotton in the inner part, further reducing the transmission of noise, thereby effectively reducing the working noise of the fan. BRIEF DESCRIPTION OF DRAWINGS

[0015] The present application will be further described below in combination with the drawings and embodiments.

[0016] Figure 1 is a structural diagram of the present application; Figure 2 is an exploded view of the present application; Figure 3 is an internal structure diagram of the outer shell body; Figure 4 is an internal structure diagram of the inner shell body. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical scheme and advantages of the present application more clear and explicit, the present application will be further described in detail below in combination with specific embodiments and with reference to the drawings. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0018] It is understood that the above description is only exemplary and is not intended to limit the scope of the present application.

[0019] Some embodiments of the application provide a method for reducing the noise of a fan, as described below with reference to the accompanying drawings, in which:

[0020] Referring to Figures 1-4 A low-noise dust collection volute fan for a saw bench comprises a volute-shaped outer housing 1 and a motor 2 mounted on the side of the outer housing, the motor 2 being a brushless motor, a rotating shaft of the motor 2 being provided with an impeller 3, the impeller 3 being located inside the outer housing 1, an inner housing being mounted in the outer housing 1, an air cavity being provided between the outer housing 1 and the inner housing, and sound-absorbing cotton being filled in the air cavity, the inner housing being provided with an exhaust port 5, a lower side of the exhaust port 5 being provided with a flow guide plate 6 corresponding to an exhaust direction of the exhaust port 5, when the impeller 3 rotates, the exhaust airflow generated by the rotation of the impeller 3 is discharged through the exhaust port 5, and at the same time, the rotating impeller 3 generates a separation vortex, the exhaust airflow and the separation vortex are separated by the flow guide plate 6, so as to avoid the collision between the exhaust airflow and the separation vortex, thereby reducing the vibration and pulsation caused by the vortex and reducing the generation of noise, and at the same time, the noise is absorbed and isolated by the air cavity and the sound-absorbing cotton inside, further reducing the transmission of noise, thereby effectively reducing the working noise of the fan.

[0021] The outer housing 1 and the inner housing are both composed of symmetrical left and right housings, when being installed, first, the outer housing on one side of the motor 2 (as shown by A in the figure) is installed on the motor 2 and filled with sound-absorbing cotton, then, the inner housing on the same side (as shown by C in the figure) is installed on the outer housing on the same side, then, the impeller 3 is installed on the output shaft of the motor 2, the inner housing on the other side (as shown by D in the figure) is installed, and finally, the sound-absorbing cotton is filled in the outer housing on the other side (as shown by B in the figure) and fixedly installed. Figure 2 Figure 2 Figure 2 Figure 2

[0022] A plurality of concentric grooves 7 are provided on the inner side of the outer housing 1, the sound-absorbing cotton is filled in the concentric grooves 7, when sound encounters an obstacle during transmission, reflection, absorption, transmission and other situations may occur, in the product, the noise generated by the rotation of the impeller 3 is first transmitted from the inner housing into the air cavity, part of the sound is directly absorbed by the sound-absorbing cotton, and part of the sound is repeatedly reflected in the concentric grooves 7 and is absorbed by the sound-absorbing cotton again during the reflection, thereby greatly reducing the effect of noise transmission, only the remaining part is transmitted from the outer housing 1, and this part is the part that can be heard by people, and this part of sound can be reduced by about 10-15 dB compared with conventional volute fans.

[0023] ​​​​The end of the deflector 6 extends to the side away from the air flow of the exhaust port 5 with an extension 8, which enhances the strength of the deflector 6, avoids the deflector 6 from oscillating when the air flow flows through the deflector 6, and causes unnecessary noise. The extension 8 is an arc structure, which is adapted to the outer diameter of the impeller 3. The side of the extension 8 has a gap of 0.5-2mm with the outside of the impeller 3.

[0024] The outer shell 1 is provided with a sleeve part 9 corresponding to the exhaust port 5, which is sleeved on the outside of the exhaust port 5, and enhances the strength of the exhaust port 5, avoids the exhaust port 5 from oscillating due to high pressure air flow, and causes unnecessary noise.

[0025] The end of the exhaust port 5 is provided with a quick release connector 10, and the outside of the end of the exhaust port 5 is provided with at least two first protrusions 11 arranged in the circumferential direction away from the center. The quick release connector 10 is provided with a mounting cavity 12, and the end of the mounting cavity 12 is provided with a second protrusion 13 corresponding to the first protrusion 11 towards the center. The first protrusion 11 is inserted into the mounting cavity 12 through the concave notch 14, and the side of the first protrusion 11 is rotated to abut the side of the second protrusion 13.

[0026] The side wall of the outer shell 1 is provided with an air inlet 15, and the air inlet 15 is provided with a connecting elbow 16. The product can be applied to a dust-free saw bench. When the dust generated by the saw bench is sucked by the product, the dust suction head is connected to the connecting elbow 16 through a pipeline. The dust suction head is placed around the saw blade. The motor 2 is started to rotate the impeller 3. The air in the inner shell is discharged through the exhaust port 5 to form a negative pressure in the inner shell. The external air enters the inner shell through the connecting elbow 16, and a large amount of dust is sucked in. The dust is discharged through the exhaust port 5. The end of the exhaust port 5 is connected to a dust collection bag through the quick release connector 10. The dust is collected to a certain extent through the dust collection bag, and then treated.

[0027] When the dust in the dust collection bag is treated, the quick release connector 10 is removed for operation, which is simple, convenient and efficient. At the same time, it can avoid opening the dust collection bag in the working area and causing the dust in the bag to leak out.

[0028] The connecting elbow 16 is a 90-degree elbow, which can guide the airflow of the inlet air, reduce the instability and additional resistance caused by the direct impact of the airflow on the fan inlet, and at the same time, the dust of larger particles will first hit the connecting elbow 16 due to its inertia and then enter the fan, so as to effectively reduce the speed of the dust and greatly reduce the noise caused by the high-speed impact of the dust on the impeller 3.

[0029] In the present application, the term "a plurality of" refers to two or more, unless otherwise explicitly limited. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items. The terms "mounting", "connected", "connecting", "fixed", and the like should be interpreted broadly, for example, "connected" can be fixed connection, or detachable connection, or integrally connected; "connected" can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0030] It should be noted that when an element is referred to as "assembled", "mounted", "fixed" or "disposed" on another element, it can be directly on another element or there can be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation.

[0031] In the description of the present application, the terms "one embodiment", "some embodiments", "a specific embodiment" and the like are intended to mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0032] Although embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A low-noise dust collection volute fan for a saw bench, comprising a volute-shaped outer housing (1) and a motor (2) mounted on the side of the outer housing (1), a rotating shaft of the motor (2) being provided with an impeller (3), the impeller (3) being located inside the outer housing (1), characterized in that The outer shell (1) is internally provided with an inner shell, and an air cavity is formed between the outer shell (1) and the inner shell, and the air cavity is filled with sound-absorbing cotton; the inner shell is provided with an exhaust port (5), and a guide plate (6) is arranged on the lower side of the exhaust port (5) and is adapted to the exhaust direction of the exhaust port (5).

2. The low noise dust collection volute fan for saw bench according to claim 1, characterized in that The inner side of the outer shell (1) is provided with a plurality of concentric grooves (7), and the sound-absorbing cotton is filled in the concentric grooves (7).

3. The low noise dust collection volute fan for saw bench according to claim 1, characterized in that The end of the guide plate (6) extends to the side away from the air flow of the exhaust port (5) and is provided with an extension part (8), and the side surface of the extension part (8) has a gap with the outer side of the impeller (3).

4. The low noise dust collection volute fan for saw bench according to claim 3, characterized in that The size of the gap is 0.5-2mm.

5. The low noise dust collection volute blower for saw benches according to claim 3, characterized in that The extension part (8) is an arc structure and is adapted to the outer diameter of the impeller (3).

6. The low noise dust extraction volute fan for saw benches according to claim 1, characterized in that The outer shell (1) is provided with a sleeving part (9) corresponding to the exhaust port (5), and the sleeving part (9) is sleeved on the outer side of the exhaust port (5).

7. The low noise dust extraction volute fan for saw benches according to claim 1, characterized in that The end of the exhaust port (5) is provided with a quick-release connector (10).

8. The low noise dust extraction volute fan for saw benches according to claim 1, characterized in that The outer side of the end of the exhaust port (5) is provided with at least two first protrusions (11) arranged along the circumference and away from the center, and the quick-release connector (10) is provided with a mounting cavity (12), and the end of the mounting cavity (12) is provided with a second protrusion (13) corresponding to the first protrusion (11) and away from the center, and the second protrusions (13) form an inner recess (14) between them, and the first protrusions (11) are inserted into the mounting cavity (12) through the inner recess (14), and the side surface of the first protrusions (11) is abutted with the side surface of the second protrusions (13) by rotating.

9. The low noise dust extraction volute fan for saw benches according to claim 1, characterized in that The side wall of the outer shell (1) is provided with an air inlet (15), and the air inlet (15) is internally provided with a connecting elbow (16).

10. The low noise dust extraction volute fan for saw benches according to claim 1, characterized in that The motor (2) is a brushless motor.

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