Air inlet noise reduction structure of ventilator

Abstract

The utility model relates to the technical field of ventilators, in particular to an air inlet noise reduction structure of a ventilator, which comprises a main case, the main case is provided with an air inlet and an air outlet which are communicated with an inner cavity, the inner cavity of the main case is rotatably connected with a centrifugal wind wheel, the centrifugal wind wheel and the air inlet are coaxially arranged, and the main case is provided with an air inlet housing covering the air inlet. The air inlet housing is provided with an air inlet port distributed around the axis of the air outlet, and an included angle is formed between the axis direction of the air inlet port and the rotating tangential direction of the centrifugal wind wheel and is an acute angle. The included angle is formed between the axis direction of the air inlet port and the rotating tangential direction of the centrifugal wind wheel, and the included angle is an acute angle, so that the center line direction of the air inlet is close to the rotating tangential direction of the wind wheel and better fits the air flowing track, and therefore the air inlet resistance of the ventilator is reduced, the air outlet amount is increased, and noise is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of ventilators, and in particular to an air intake noise reduction structure of a ventilator. Background Art

[0002] Fans are widely used for ventilation in factories, mines, tunnels, cooling towers, vehicles, ships and buildings.

[0003] Existing ventilators usually include a main housing, in which a centrifugal impeller is installed, and is equipped with an air inlet and an air outlet. Among them, the air inlet is usually designed to be parallel to the axis of the centrifugal impeller to better guide the air into the interior of the fan. Although this structure can meet basic ventilation needs to a certain extent, there are still some shortcomings in actual application: when the ventilator is running, if the angle between the air flow direction and the air inlet is too large, the air intake will be obstructed, thereby affecting the overall ventilation effect. This not only manifests as a reduction in the air intake volume, but also causes higher operating noise, which ultimately affects the user experience, so further improvement is needed. Utility Model Content

[0004] In order to reduce the air intake resistance of the ventilator and reduce the possibility of the ventilator generating noise, the present application provides an air intake noise reduction structure of the ventilator.

[0005] The present application provides a ventilation fan air intake noise reduction structure adopting the following technical solutions:

[0006] A ventilation fan air intake noise reduction structure includes a main casing, the main casing having an air inlet and an air outlet connected to an inner cavity, the inner cavity of the main casing is rotatably connected to a centrifugal fan wheel, the centrifugal fan wheel and the air inlet are coaxially arranged, the main casing is provided with an air inlet cover shell covering the air inlet, the air inlet cover shell is provided with air inlet vents distributed around the axis of the air outlet, an angle is formed between the axial direction of the air inlet vent and the rotation tangent direction of the centrifugal fan wheel, and the angle is an acute angle.

[0007] By adopting the above technical solution, an angle is formed between the axial direction of the air inlet and the tangential direction of rotation of the centrifugal wind wheel. The angle is an acute angle, so that the centerline direction of the air inlet is close to the tangential direction of rotation of the wind wheel, which is more in line with the trajectory of air flow, thereby reducing the air inlet resistance of the fan, increasing the air output and reducing noise.

[0008] Preferably, the angle is 60°-70°.

[0009] By adopting the above technical solution, the air flow path is further optimized and the wind intake resistance is effectively reduced.

[0010] Preferably, the air inlet cover is detachably connected to the main housing.

[0011] By adopting the above technical solution, the air inlet cover can be detachably connected to the main housing, which facilitates disassembly, assembly and maintenance of the air inlet cover.

[0012] Preferably, there are at least two air inlet openings.

[0013] By adopting the above technical solution, one ventilator can be used for ventilation in multiple rooms at the same time, achieving one-to-many service.

[0014] Preferably, the air inlet housing is provided with a cover for controlling the opening and closing of the air inlet vent.

[0015] By adopting the above technical solution, when a ventilator only ventilates one room, one of the air inlet vents is kept in a connected state, and the other air inlet vents are closed by the cover. When a ventilator ventilates multiple rooms at the same time, the corresponding number of air inlet vents are kept in a connected state, which reduces the types of products, improves the applicability of the ventilator between the one-to-one mode and the one-to-multiple mode, and reduces the mold cost of the product.

[0016] Preferably, the air inlet cover is fixedly provided with an air inlet tube connected to the inner cavity, one end of the air inlet tube away from the air inlet cover is open to form an air inlet opening, and the sealing cover is threadedly sleeved on the air inlet tube.

[0017] By adopting the above technical solution, the cover is threadedly connected to the air inlet tube, which facilitates quick installation and removal of the cover, thereby facilitating adjustment of the state of the air inlet vent and enhancing flexibility of use.

[0018] Preferably, the air inlet cover is rotatably connected to the main housing around the air inlet axis.

[0019] By adopting the above technical solution, the air inlet cover is rotatably connected to the main housing around the axis of the air inlet, which makes it easy to adjust the position of the air inlet according to the installation conditions and improves the installation convenience.

[0020] Preferably, the air inlet cover is coaxially fixedly connected to a connecting tube rotatably inserted into the air inlet, and one end of the connecting tube away from the air inlet cover is detachably connected to an anti-slip ring abutting against the inner wall of the main housing.

[0021] By adopting the above technical solution, the rotational connection between the air inlet cover and the main housing is achieved through the connecting tube, and the anti-slip ring effectively prevents the air inlet cover from falling out of the air inlet.

[0022] In summary, the present invention has the following beneficial effects:

[0023] 1. The angle between the axis direction of the air inlet and the tangential direction of the centrifugal impeller is acute, so that the centerline direction of the air inlet is close to the tangential direction of the impeller, which is more in line with the trajectory of air flow, thereby reducing the air inlet resistance of the fan, increasing the air output and reducing noise;

[0024] 2. When a ventilator ventilates only one room, keep one of the air inlet vents connected and the other air inlet vents closed with covers. When a ventilator ventilates multiple rooms at the same time, keep the corresponding number of air inlet vents connected. This reduces the variety of products, improves the applicability of the ventilator between one-to-one and one-to-multiple modes, and reduces the mold cost of the product.

[0025] 3. The air inlet cover is connected to the main housing by rotating around the air inlet axis, which makes it easy to adjust the position of the air inlet according to the installation conditions and improves the installation convenience. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the overall structure of an air intake noise reduction structure of a ventilator in Example 1;

[0027] Figure 2 is a schematic structural diagram of the main housing in Example 1;

[0028] Figure 3 is a top view of an air inlet noise reduction structure of a ventilator in Example 1;

[0029] Figure 4 is a schematic diagram of the angle in Example 1;

[0030] Figure 5 This is a schematic diagram of the overall structure of an air intake noise reduction structure of a ventilator in Example 2;

[0031] Figure 6 This is a schematic diagram of the connection structure between the air inlet cover and the main housing in Example 3.

[0032] In the figure, 1. main casing; 11. air inlet; 12. air outlet; 13. centrifugal impeller; 2. air inlet cover; 21. mounting plate; 22. air inlet tube; 23. air inlet vent; 24. connecting tube; 241. limiting ring; 242. anti-slip ring; 3. sealing cover. DETAILED DESCRIPTION

[0033] The following is combined with Figure 1-6 This application is described in further detail.

[0034] Example 1:

[0035] The embodiment of the present application discloses an air intake noise reduction structure of a ventilator, referring to Figure 1 、 Figure 2The main housing 1 includes a main housing 1, an air inlet 11 connected to the inner cavity is formed on the upper end surface of the main housing 1, and an air outlet 12 connected to the inner cavity is formed on one side wall of the main housing 1. The air inlet 11 and the air outlet 12 are each provided with one, and the axial direction of the air inlet 11 is perpendicular to the axial direction of the air outlet 12. A centrifugal impeller 13 is rotatably connected to the inner cavity of the main housing 1, and the centrifugal impeller 13 and the air inlet 11 are coaxially arranged.

[0036] The main housing 1 is provided with an air inlet cover 2 that covers the air inlet 11. The air inlet cover 2 has a hemispherical structure and is open at its lower end. The axis of the air inlet cover 2 coincides with the axis of the air inlet 11. In this embodiment, the air inlet cover 2 is detachably connected to the main housing 1. Specifically, a mounting plate 21 is fixedly connected to the lower end surface of the air inlet cover 2, and the mounting plate 21 is fixedly connected to the upper end surface of the main housing 1 via bolts.

[0037] Reference Figure 2 、 Figure 3 、 Figure 4 The air inlet cover 2 is fixedly provided with an air inlet tube 22 connected to the inner cavity. One or more air inlet tubes 22 can be provided. In the present embodiment, two air inlet tubes 22 are provided and distributed around the axis of the air outlet 12. The air inlet tube 22 is away from the port of the air inlet cover 2 to form an air inlet vent 23. The axial direction of the air inlet vent 23 and the rotation tangent direction of the centrifugal wind wheel 13 form an angle, which is an acute angle. Preferably, the angle is set to 60°-70°. In the present embodiment, the angle is 66°.

[0038] The implementation principle of the air inlet noise reduction structure of a fan in an embodiment of the present application is: an angle is formed between the axial direction of the air inlet 23 and the rotation tangential direction of the centrifugal wind wheel 13, so that the center line direction of the air inlet 11 is close to the tangential direction of the wind wheel rotation, which is more in line with the trajectory of air flow, thereby reducing the air inlet resistance of the fan, increasing the air output, and reducing noise.

[0039] Example 2:

[0040] The difference from Example 1 is that, referring to Figure 5 The air inlet cover 2 is provided with a cover 3 for controlling the opening and closing of the air inlet vent 23. The cover 3 is threadedly sleeved on the air inlet tube 22. Specifically, the outer peripheral wall of the air inlet tube 22 has an external thread, and the inner peripheral wall of the cover 3 has an internal thread threadedly connected to the external thread.

[0041] When the ventilator only serves a single room, the cover 3 can be screwed onto one of the air inlet tubes 22 to close one air inlet vent 23 and keep one air inlet vent 23 connected to the room; when the ventilator needs to serve two rooms, the two air inlet vents 23 are in a connected state, thereby improving the applicability of the ventilator between one-to-one mode and one-to-multiple modes, reducing the required product types, and reducing mold costs.

[0042] Example 3:

[0043] The difference from Example 1 is that, referring to Figure 6 The air inlet cover 2 is connected to the upper end surface of the main housing 1 by rotating around the axis of the air inlet 11. Specifically, the air inlet cover 2 is coaxially fixedly connected to a connecting tube 24 inserted into the air inlet 11. The connecting tube 24 is coaxially fixedly sleeved with a limiting ring 241 that abuts the upper end surface of the main housing 1. The end of the connecting tube 24 away from the air inlet cover 2 is screwed with an anti-slip ring 242. The upper end surface of the anti-slip ring 242 abuts the top inner wall of the main housing 1. The outer diameters of the limiting ring 241 and the anti-slip ring 242 are both larger than the inner diameter of the air inlet 11. The air inlet cover 2 is connected to the main housing 1 by rotating around the axis of the air inlet 11, which facilitates the adjustment of the position of the air inlet vent 23 according to the installation conditions and improves installation convenience.

[0044] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A fan air intake noise reduction structure, characterized by: The invention comprises a main housing (1), wherein the main housing (1) has an air inlet (11) and an air outlet (12) connected to an inner cavity, wherein the inner cavity of the main housing (1) is rotatably connected to a centrifugal fan wheel (13), wherein the centrifugal fan wheel (13) and the air inlet (11) are coaxially arranged, and the main housing (1) is provided with an air inlet cover (2) covering the air inlet (11), wherein the air inlet cover (2) is provided with an air inlet vent (23) distributed around the axis of the air outlet (12), wherein an angle is formed between the axial direction of the air inlet vent (23) and the rotation tangent direction of the centrifugal fan wheel (13), wherein the angle is an acute angle.

2. The air intake noise reduction structure of a ventilator according to claim 1, characterized in that: The angle is 60°-70°.

3. The air intake noise reduction structure of a ventilator according to claim 1, characterized in that: The air inlet cover (2) is detachably connected to the main housing (1).

4. The air intake noise reduction structure of a ventilator according to claim 1, characterized in that: At least two air inlet openings (23) are provided.

5. The air intake noise reduction structure of a ventilator according to claim 4, characterized in that: The air inlet housing (2) is provided with a cover (3) for controlling the opening and closing of the air inlet opening (23).

6. The air intake noise reduction structure of a ventilator according to claim 5, characterized in that: The air inlet housing (2) is fixedly provided with an air inlet tube (22) connected to the inner cavity. One end of the air inlet tube (22) away from the air inlet housing (2) is open to form an air inlet opening (23). The sealing cover (3) is threadedly sleeved on the air inlet tube (22).

7. The air intake noise reduction structure of a ventilator according to claim 1, characterized in that: The air inlet cover (2) is rotatably connected to the main housing (1) around the axis of the air inlet (11).

8. The air intake noise reduction structure of a ventilator according to claim 7, characterized in that: The air inlet cover (2) is coaxially fixedly connected to a connecting tube (24) that is rotatably inserted into the air inlet (11); one end of the connecting tube (24) away from the air inlet cover (2) is detachably connected to an anti-slip ring (242) that abuts against the inner wall of the main housing (1).

Images