Low-noise fan structure

Abstract

The utility model discloses a low-noise fan structure which comprises an upper fan cover and a volute which are connected with each other, a motor is installed on the volute, the outer wall of the motor is connected with the volute in a sealing mode, an output shaft of the motor is connected with an impeller, the impeller is arranged in an air inlet of the upper fan cover, and a downward protrusion is arranged on an inner ring of the air inlet of the upper fan cover. The top of an air inlet of the impeller is inserted into a groove formed by the protrusion, the distance between the inner wall of the air inlet of the impeller and the outer wall of the protrusion on the upper fan cover is 0.5-1 mm, a fixed air inlet channel is formed between the air inlet of the impeller and the upper fan cover, and a spiral guide plate fixed to the outer wall of the motor is arranged below the impeller. And the spiral direction of the spiral guide plate is consistent with the rotating direction of the impeller. The clearance between the upper fan cover and the impeller is controlled, the efficiency of the fan is improved, noise is reduced, noise caused by turbulent flow is reduced by arranging the spiral guide plate with the spiral direction identical to the rotating direction of the impeller, and noise generated by the clearance between the motor and the volute is reduced by arranging the sealing ring.

Description

Technical Field

[0001] The utility model relates to the technical field of fan equipment, in particular to a low-noise fan structure. Background Art

[0002] Fans are widely used as power sources for blowing, negative pressure suction, etc. For example, daily hair dryers, or vacuum cleaners and sweepers used for cleaning are all equipped with fans.

[0003] As people's living standards improve, they are more pursuing quiet electrical equipment. Therefore, how to reduce the noise generated by the fan when it is working has always been a problem faced by technical personnel in this field. However, due to structural and process reasons, it is difficult to effectively reduce the noise of the current fan. Based on the above problems, a low-noise fan structure is proposed. Utility Model Content

[0004] The purpose of this utility model is to provide a low-noise fan structure to solve the above problems.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] The utility model discloses a low-noise fan structure, comprising an upper wind cover and a volute connected to each other, a motor is mounted on the volute, the outer wall of the motor is sealed to the volute, an impeller is connected to the output shaft of the motor, the impeller is placed below the air inlet of the upper wind cover, the inner ring of the air inlet of the upper wind cover is provided with a downward protrusion, the top of the air inlet of the impeller is inserted into the groove formed by the protrusion, the distance between the inner wall of the air inlet of the impeller and the outer wall of the protrusion on the upper wind cover is 0.5-1mm, a fixed air inlet duct is formed between the air inlet of the impeller and the upper wind cover, a spiral guide plate is provided below the impeller, the spiral guide plate is fixed to the outer wall of the motor, and the spiral direction of the spiral guide plate is consistent with the rotation direction of the impeller.

[0007] Furthermore, a sealing ring is provided on the outer wall of the motor, and the motor is sealedly connected to the volute through the sealing ring.

[0008] Furthermore, the distance between the side surface of the upper end cover of the impeller and the inner wall of the upper wind shield is 0.5-1 mm.

[0009] Furthermore, the spiral guide plate is fixed to the outer wall of the motor by screws.

[0010] Furthermore, the spiral channel of the spiral guide plate and the inner wall of the upper wind shield form a regular outlet flow channel.

[0011] Compared with the prior art, the beneficial technical effects of the present invention are:

[0012] The utility model improves the efficiency of the fan and reduces noise by controlling the gap between the upper wind cover and the impeller. It also reduces noise caused by turbulence by arranging a spiral guide plate with the same spiral direction as the impeller rotation direction at the mating surface of the motor housing and the volute. It also reduces noise generated by the gap between the motor and the volute by arranging a sealing ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention will be further described below with reference to the accompanying drawings.

[0014] Figure 1 This is a top view of the low-noise fan structure of the utility model;

[0015] Figure 2 This is a cross-sectional view of the low-noise fan structure of the utility model;

[0016] Figure 3 This is the front view of the spiral guide plate;

[0017] Figure 4 It is a top view of the spiral guide plate;

[0018] Explanation of the accompanying reference numerals: 1. upper wind cover; 2. volute; 3. motor; 4. output shaft; 5. impeller; 6. protrusion; 7. spiral guide plate; 8. sealing ring; 9. screw. DETAILED DESCRIPTION

[0019] like Figure 1-4 As shown, a low-noise fan structure includes an upper wind cover 1 and a volute 2 connected to each other, a motor 3 is installed on the volute 2, and a sealing ring 8 is provided on the outer wall of the motor 3. The motor 3 is sealed to the volute 2 through the sealing ring 8 to prevent air flow from leaking out through the installation gap and reduce the structural noise generated thereby.

[0020] An impeller 5 is connected to the output shaft 4 of the motor 3, and the impeller 5 is placed below the air inlet of the upper wind cover 1. The inner ring of the air inlet of the upper wind cover 1 is provided with a downward protrusion 6, and the top of the air inlet of the impeller 5 is inserted into the groove formed by the protrusion 6. The distance between the inner wall of the air inlet of the impeller 5 and the inner wall of the protrusion 6 on the upper wind cover 1 is 0.5-1mm. A fixed air inlet duct is formed between the air inlet of the impeller 5 and the upper wind cover 1, which reduces the gap between the inner wall of the upper wind cover 1 and the upper end cover structure of the impeller 5 to improve the efficiency of the fan and reduce noise.

[0021] The distance between the side surface of the upper end cover of the impeller 5 and the inner wall of the upper wind cover 1 is 0.5-1mm. In this way, the two will not cause structural interference due to structural processing errors, and the air volume at the air outlet of the impeller 5 will be prevented from flowing back to the air inlet, thereby improving the efficiency of the fan and reducing the noise caused by backflow.

[0022] A spiral guide plate 7 is provided below the impeller 5, and the spiral guide plate 7 is fixed to the outer wall of the motor 3 by screws 9. The spiral direction of the spiral guide plate 7 is consistent with the rotation direction of the impeller 5. The rotation direction of the spiral guide plate 7 is set in this way to ensure that it does not affect the air volume efficiency of the fan, and can also play a good role in guiding the fluid.

[0023] The spiral channel of the spiral guide plate 7 and the inner wall of the upper wind shield form a regular outlet flow channel, and the fluid flows regularly along the outlet flow channel to the air outlet. The fluid is rectified in the flow channel and flows out regularly, reducing noise caused by turbulence.

[0024] The action process of this utility model is as follows:

[0025] When in use, the motor 3 drives the output shaft 4 to rotate, thereby driving the impeller 5 to rotate, so that a pressure difference is formed between the inner cavity of the fan and the outer side of the fan, and a negative pressure is formed in the inner cavity of the fan. The fluid enters the fan through the air inlet duct formed by the air inlet of the upper wind cover 1 and the air inlet of the impeller 5. Under the action of the impeller 5, the fluid enters the interior of the impeller 5, and the fluid is compressed inside the impeller 5. Then the fluid is output from the air outlet of the impeller 5. The compressed fluid flows to the spiral guide plate 7 below, flows out along the flow direction specified by the spiral guide plate, and is finally discharged from the air outlet of the fan.

[0026] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements to the technical solutions of the present invention made by ordinary technicians in this field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. A low-noise fan structure, characterized by: The invention comprises an upper wind cover (1) and a volute (2) connected to each other, a motor (3) is installed on the volute (2), the outer wall of the motor (3) is sealed with the volute (2), an impeller (5) is connected to the output shaft (4) of the motor (3), the impeller (5) is placed below the air inlet of the upper wind cover (1), the inner ring of the air inlet of the upper wind cover (1) is provided with a downward protrusion (6), the top of the air inlet of the impeller (5) is inserted into the protrusion (6) The distance between the inner wall of the air inlet of the impeller (5) and the inner wall of the protrusion (6) on the upper wind cover (1) is 0.5-1 mm, and a fixed air inlet duct is formed between the air inlet of the impeller (5) and the upper wind cover (1). A spiral guide plate (7) is provided below the impeller (5), and the spiral guide plate (7) is fixed on the outer wall of the motor (3). The spiral direction of the spiral guide plate (7) is consistent with the rotation direction of the impeller (5).

2. The low-noise fan structure according to claim 1, characterized in that: A sealing ring (8) is provided on the outer wall of the motor (3), and the motor (3) is sealedly connected to the volute (2) via the sealing ring (8).

3. The low-noise fan structure according to claim 1, characterized in that: The distance between the side surface of the upper end cover of the impeller (5) and the inner wall of the upper wind cover (1) is 0.5-1 mm.

4. The low-noise fan structure according to claim 1, characterized in that: The spiral guide plate (7) is fixed to the outer wall of the motor (3) by means of screws (9).

5. The low-noise fan structure according to claim 4, characterized in that: The spiral channel of the spiral guide plate (7) and the inner wall of the upper wind shield form a regular outlet flow channel.

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