Low-noise dust collection volute fan for saw bench

Abstract

The utility model discloses a low-noise dust collection volute fan for a saw bench, which comprises a volute-shaped outer shell and a motor arranged on the side edge of the outer shell, an impeller is arranged on a rotating shaft of the motor, the impeller is positioned in the outer shell, an inner shell is arranged in the outer shell, an air cavity is arranged between the outer shell and the inner shell, and the air cavity is communicated with the inner shell. The air cavity is filled with sound-absorbing 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 utility model relates to a sawing table, in particular to a low-noise dust-absorbing volute fan for the sawing table. Background Art

[0002] A volute fan is a device that uses the high-speed rotation of the impeller to discharge the internal air toward the exhaust port, while replenishing air through the side walls of the volute. During the high-speed rotation of the impeller, certain separation vortices will be generated on the surface of the impeller. The separation vortices are usually unstable and will continuously rotate, stretch, and deform. When the airflow flowing to the exhaust port hits these unstable vortices, it will cause the vortices to vibrate and pulsate, thereby generating noise. Summary of the Invention

[0003] In order to overcome the deficiencies in the prior art, the utility model provides a.

[0004] The technical solution adopted by the utility model to solve its technical problems is:

[0005] A low-noise dust-absorbing volute fan for a saw table comprises a volute-shaped outer shell and a motor mounted on the side of the outer shell, the rotating shaft of the motor is equipped with an impeller, the impeller is located inside the outer shell, an inner shell is mounted inside the outer shell, an air cavity is provided between the outer shell and the inner shell, and the air cavity is filled with sound-absorbing cotton; the inner shell is provided with an exhaust port, and a guide plate adapted to the exhaust direction of the exhaust port is provided at the connection between the lower side of the exhaust port and the interior of the inner shell.

[0006] A plurality of concentric grooves are provided on the inner side of the outer shell, and the sound-absorbing cotton is filled in the concentric grooves.

[0007] An extension portion is extended from the end of the guide plate toward a side away from the air flow of the exhaust port, and a gap is formed between the side surface of the extension portion and the outer side of the impeller.

[0008] The size of the gap is 0.5-2 mm.

[0009] The extended portion is an arc-shaped structure adapted to the outer diameter of the impeller.

[0010] A sleeve portion is provided on the outer shell corresponding to the exhaust port, and the sleeve portion is sleeved on the outer side of the exhaust port.

[0011] A quick-release connector is installed at the end of the exhaust port.

[0012] At least two first protrusions are arranged evenly in the circumferential direction on the outer side of the exhaust port end in a direction away from the center of the circle, and a mounting cavity is provided on the quick-release connector. A second protrusion corresponding to the first protrusion is provided at the end of the mounting cavity in the direction of the center of the circle, and an inner concave notch is formed between the two second protrusions. The first protrusion is inserted into the mounting cavity through the inner concave notch, and is rotated so that the side surface of the first protrusion abuts against the side surface of the second protrusion.

[0013] The side wall of the outer shell is provided with an air inlet, and a connecting elbow is installed in the air inlet.

[0014] The motor is a brushless motor.

[0015] The beneficial effects of the utility model are: a low-noise dust-absorbing volute fan for a saw table, comprising a volute-shaped outer shell and a motor installed on the side of the outer shell, the rotating shaft of the motor is equipped with an impeller, the impeller is located inside the outer shell, and an inner shell is installed in the outer shell, an air cavity is provided between the outer shell and the inner shell, and the air cavity is filled with sound-absorbing cotton; the inner shell is provided with an exhaust port, and a guide plate adapted to the exhaust direction of the exhaust port is provided at the connection between the lower side of the exhaust port and the inside of the inner shell, the outlet airflow generated when the impeller rotates is discharged through the exhaust port, and at the same time, the impeller rotates to generate a separation vortex, and the guide plate separates the outlet airflow and the separation vortex, avoiding the collision of the outlet airflow with the separation vortex, thereby reducing the vibration and pulsation causing the vortex, reducing the generation of noise, and at the same time, the noise is absorbed and isolated by the air cavity and the internal sound-absorbing cotton, further reducing the transmission of noise, thereby effectively reducing the working noise of the fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] Figure 1 It is a structural diagram of the utility model;

[0018] Figure 2 It is an exploded view of the utility model;

[0019] Figure 3 It is the internal structure diagram of the outer shell;

[0020] Figure 4 It is the internal structure diagram of the inner shell. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the present invention more clear, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be noted that the embodiments of the present invention and the features therein can be combined with each other unless there is any conflict.

[0022] It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention.

[0023] Some embodiments of the present invention are described below with reference to the accompanying drawings.

[0024] Reference Figure 1-4 The worm gear 2 is provided with an air filter 6, and the worm gear 2 is provided with an air filter 6. The worm gear 2 is provided with an air filter 6, and the worm gear 2 is provided with an air filter 6. The worm gear 2 is provided with an air filter 6, and the worm gear 2 is provided with an air filter 6.

[0025] The outer shell 1 and the inner shell are both symmetrically composed of left and right shells. When installing, first install the outer shell on the side where the motor 2 is installed (such as Figure 2 Install the motor 2 and fill it with sound-absorbing cotton, then fix the inner shell on the same side (as shown in Figure 2 Install the impeller 3 on the output shaft of the motor 2, and then install the inner casing on the other side (as shown in C in the figure) on the outer casing on the same side. Figure 2 Install it as shown in D in the figure, and finally fill the sound-absorbing cotton into the outer shell on the other side (as shown in Figure 2 After that, install it securely.

[0026] A number of concentric grooves 7 are provided on the inner side of the outer shell 1, and the sound-absorbing cotton is filled in the concentric grooves 7. When the sound encounters an obstacle during the propagation process, reflection, absorption, transmission, etc. may occur. In this product, the noise generated by the rotation of the impeller 3 will first be transmitted from the inner shell and enter the air cavity, where 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. By being absorbed by the sound-absorbing cotton for the second time during the reflection process, the effect of noise transmission can be greatly reduced. Only the remaining part is transmitted from the inside of the outer shell 1, which is the part that people can hear. Compared with a conventional volute fan, the sound of this part can be reduced by about 10-15dB.

[0027] The end of the guide plate 6 is extended with an extension portion 8 toward the side away from the airflow of the exhaust port 5 to enhance the strength of the guide plate 6 and prevent the guide plate 6 from oscillating when the outlet airflow flows through the guide plate 6, thereby preventing unnecessary noise from being generated. The extension portion 8 is an arc-shaped structure that is adapted to the outer diameter of the impeller 3. The side of the extension portion 8 has a gap of 0.5-2 mm with the outer side of the impeller 3.

[0028] A sleeve portion 9 is provided on the outer shell 1 corresponding to the exhaust port 5. The sleeve portion 9 is sleeved on the outside of the exhaust port 5 to strengthen the strength of the exhaust port 5 and avoid vibration of the exhaust port 5 due to high-pressure airflow, which leads to unnecessary noise.

[0029] A quick-release connector 10 is installed at the end of the exhaust port 5. At least two first protrusions 11 are arranged evenly in the circumferential direction on the outer side of the end of the exhaust port 5 in a direction away from the center of the circle. A mounting cavity 12 is provided on the quick-release connector 10. A second protrusion 13 corresponding to the first protrusion 11 is provided at the end of the mounting cavity 12 in the direction of the center of the circle. An inner concave notch 14 is formed between the two second protrusions 13. The first protrusion 11 is inserted into the mounting cavity 12 through the inner concave notch 14, and is rotated so that the side surface of the first protrusion 11 abuts against the side surface of the second protrusion 13.

[0030] The side wall of the outer shell 1 is provided with an air inlet 15, and a connecting elbow 16 is installed in the air inlet 15. This product can be used for a dust-free saw table. When the saw table is working, the dust generated by the saw table is sucked by this product. The dust collection head is connected to the pipe on the connecting elbow 16, and the dust collection head is placed around the saw blade. The motor 2 is started to rotate the impeller 3, and the air in the inner shell is discharged through the exhaust port 5, so that a negative pressure is formed in the inner shell. The external air passes through the dust collection head and enters the interior of the inner shell from the connecting elbow 16, and at the same time, a large amount of dust is sucked in and discharged through the exhaust port 5. The end of the exhaust port 5 is connected to a dust collecting bag through the quick-release connector 10 pipe. The dust is collected to a certain extent by the dust collecting bag and then processed.

[0031] When processing the dust inside the dust bag, the dust bag, the quick-release connector 10 and the corresponding connecting pipes can be disassembled at the same time by rotating the quick-release connector 10, which is simple, convenient and efficient. At the same time, it can avoid opening the dust bag in the working area and causing the internal dust to leak out.

[0032] The connecting elbow 16 is a 90-degree elbow, which can guide the incoming air flow and reduce the instability and additional resistance that may be caused by the air flow directly impacting the fan inlet. At the same time, due to their inertia, larger particles of dust will first hit the connecting elbow 16 and then enter the fan, thereby effectively reducing the speed of the dust and greatly reducing the noise generated by the high-speed impact of the dust on the impeller 3.

[0033] In this utility model, the term "plurality" refers to two or more, unless otherwise expressly defined. The term "and / or" as used herein includes any and all combinations of one or more of the relevant listed items. Terms such as "install," "connect," "connect," and "fix" should be understood broadly. For example, "connect" can mean a fixed connection, a detachable connection, or an integral connection; "connected" can mean a direct connection or an indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0034] It should be noted that when an element is referred to as being "assembled to," "mounted to," "fixed to," or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0035] Throughout this specification, terms such as "one embodiment," "some embodiments," or "specific embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, illustrative uses of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0036] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A low-noise dust-absorbing volute fan for a saw table, comprising a volute-shaped outer casing (1) and a motor (2) mounted on the side of the outer casing, the rotating shaft of the motor (2) being mounted with an impeller (3), the impeller (3) being located inside the outer casing (1), characterized in that An inner shell is installed in the outer shell (1); an air cavity is provided 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); a guide plate (6) adapted to the exhaust direction of the exhaust port (5) is provided at the connection between the lower side of the exhaust port (5) and the interior of the inner shell.

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

3. The low-noise dust-absorbing volute fan for a saw table according to claim 1, characterized in that An extension portion (8) is extended from the end of the guide plate (6) toward a side away from the airflow of the exhaust port (5), and a gap is formed between the side surface of the extension portion (8) and the outer side of the impeller (3).

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

5. The low-noise dust-absorbing volute fan for a saw table according to claim 3, characterized in that The extended portion (8) is an arc-shaped structure, adapted to the outer diameter of the impeller (3).

6. The low-noise dust-absorbing volute fan for a saw table according to claim 1, characterized in that A sleeve portion (9) is provided on the outer shell (1) corresponding to the exhaust port (5), and the sleeve portion (9) is sleeved on the outside of the exhaust port (5).

7. The low-noise dust-absorbing volute fan for a saw table according to claim 1, characterized in that A quick-release connector (10) is installed at the end of the exhaust port (5).

8. The low-noise dust-absorbing volute fan for a saw table according to claim 7, characterized in that At least two first protrusions (11) are arranged evenly in the circumferential direction on the outer side of the end of the exhaust port (5) in a direction away from the center of the circle; a mounting cavity (12) is provided on the quick-release connector (10); a second protrusion (13) corresponding to the first protrusion (11) is provided at the end of the mounting cavity (12) in a direction toward the center of the circle; an inner concave notch (14) is formed between the two second protrusions (13); the first protrusion (11) is inserted into the mounting cavity (12) through the inner concave notch (14), and is rotated so that the side surface of the first protrusion (11) abuts against the side surface of the second protrusion (13).

9. The low-noise dust-absorbing volute fan for a saw table according to claim 1, characterized in that An air inlet (15) is provided on the side wall of the outer shell (1), and a connecting elbow (16) is installed in the air inlet (15).

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