Noise reduction fan

Abstract

The noise reduction draught fan comprises a volute, an impeller installed in the volute and a motor used for driving the impeller to rotate, an air inlet is formed in the side, in the axial direction of the impeller, of the volute, an air outlet is formed in the side, in the radial direction of the impeller, of the volute, the air inlet is connected with a conical air inlet channel, and the air outlet is connected with a fan. A conical air inlet channel is formed in the volute, the diameter of the conical air inlet channel is gradually increased from inside to outside, the air inlet is provided with a flow guide plate, a plurality of flow guide holes are formed in the flow guide plate, and the flow guide holes are used for guiding inlet air flow to enter the volute in the taper direction of the conical air inlet channel. According to the utility model, inlet air flow can be prevented from generating vortex at the inner wall of the conical air inlet channel, the inlet air flow is prevented from strongly impacting with the impeller after entering the volute to generate noise, and further, the noise generated during the operation of the fan is reduced.

Description

Technical Field

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

[0002] In the drying process of lithium electrode sheets, a centrifugal fan is required to blow air on the electrode sheets. The centrifugal fan is generally provided with a conical air inlet channel, one end of which is the air inlet, which is connected to the air duct. Due to the limited installation space of the air duct, after the centrifugal fan and the air duct are assembled and fixed, the distance between the air inlet of the centrifugal fan and the opposite air duct wall is small, which easily causes the incoming air flow to rotate, that is, to generate vortexes. After the incoming air flow enters the volute, it collides strongly with the rotating impeller and generates a lot of noise. Utility Model Content

[0003] In order to overcome the shortcomings of the existing technology, the utility model provides a noise reduction fan, which can avoid the generation of vortexes in the incoming air flow at the inner wall of the conical air inlet channel, prevent the incoming air flow from strongly colliding with the impeller after entering the volute and generating noise, thereby reducing the noise generated when the fan is running.

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

[0005] A noise reduction fan comprises a volute, an impeller installed in the volute, and a motor for driving the impeller to rotate, the volute is provided with an air inlet along the axial side of the impeller, the volute is provided with an air outlet along the radial side of the impeller, the air inlet is connected to a conical air inlet channel, the diameter of the conical air inlet channel gradually increases from the inside to the outside, the air inlet is provided with a guide plate, a plurality of guide holes are opened on the guide plate, and the guide holes are used to guide the incoming air flow into the volute along the taper direction of the conical air inlet channel.

[0006] As a further improvement of the above technical solution, the axis of the guide hole is an arc that protrudes from the center to the edge of the guide plate.

[0007] As a further improvement of the above technical solution, a sound-absorbing layer is provided on the inner surface of the guide hole.

[0008] As a further improvement of the above technical solution, an opening is provided at the center of the guide plate.

[0009] As a further improvement of the above technical solution, a filter screen is provided on the side of the guide plate away from the volute.

[0010] As a further improvement of the above technical solution, the air inlet, the guide plate and the filter screen are all circular structures.

[0011] As a further improvement of the above technical solution, the edge of the filter screen is pressed against the edge of the guide plate by an annular pressure plate.

[0012] As a further improvement of the above technical solution, the annular pressure plate and the guide plate are fixed to the volute by a plurality of bolts.

[0013] As a further improvement of the above technical solution, a plurality of first mounting holes are provided on the annular pressure plate, a plurality of second mounting holes are provided on the guide plate, and the plurality of first mounting holes correspond one-to-one to the plurality of second mounting holes. A plurality of threaded holes are provided on the volute, and the plurality of second mounting holes correspond one-to-one to the plurality of threaded holes. Both the first mounting holes and the second mounting holes allow the bolts to pass through, and the bolts are threadedly connected to the threaded holes.

[0014] As a further improvement of the above technical solution, a flange is provided at one end of the conical air inlet channel close to the air inlet, and the flange is provided with a plurality of third mounting holes, and the plurality of third mounting holes correspond one-to-one to the plurality of threaded holes, and the third mounting holes allow the bolts to pass through.

[0015] The beneficial effect of the present invention is that the present invention provides a noise reduction fan, by arranging a guide plate at the air inlet, and opening a plurality of guide holes on the guide plate, the guide holes provide a direction-limited channel for the incoming air flow, so that the incoming air flow can enter the volute along the taper direction of the tapered air inlet channel, thereby avoiding the incoming air flow from generating vortices at the inner wall of the tapered air inlet channel, preventing the incoming air flow from entering the volute and colliding strongly with the impeller to generate noise, thereby reducing the noise generated when the fan is running. 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 provided by an example of the utility model;

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

[0019] Figure 3 It is a cross-sectional view of the utility model;

[0020] Figure 4 yes Figure 3 Enlarged view of point A in the middle.

[0021] Figure markings: 100-volute, 110-air inlet, 120-air outlet, 130-threaded hole, 200-impeller, 300-motor, 400-conical air inlet channel, 410-flange, 420-third mounting hole, 500-guide plate, 510-guide hole, 520-soundproof layer, 530-opening, 540-second mounting hole, 600-filter, 700-annular pressure plate, 710-first mounting hole, 800-bolt. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the concept, specific structure and technical effects of the present invention in combination with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by technical personnel in this field without creative work are within the scope of protection of the present invention. In addition, all the connection / connection relationships involved in the patent do not refer to the direct connection of components, but refer to the fact that a better connection structure can be formed by adding or reducing connection accessories according to the specific implementation situation. The various technical features in the creation of the present invention can be combined interactively without conflicting with each other.

[0023] Reference Figures 1 to 4 An example of the present invention provides a noise reduction fan, including a volute 100, an impeller 200 installed in the volute 100, and a motor 300 for driving the impeller 200 to rotate. The volute 100 is provided with an air inlet 110 along the axial side of the impeller 200, and the volute 100 is provided with an air outlet 120 along the radial side of the impeller 200. The air inlet 110 is connected to a conical air inlet channel 400, and the diameter of the conical air inlet channel 400 gradually increases from the inside to the outside. The air inlet 110 is provided with a guide plate 500, and a plurality of guide holes 510 are opened on the guide plate 500. The guide holes 510 are used to guide the incoming air flow into the volute 100 along the taper direction of the conical air inlet channel 400.

[0024] Specifically, the motor 300 drives the impeller 200 to rotate and generate suction, and the airflow on the air duct enters the volute 100 through several guide holes 510 on the guide plate 500. When the impeller 200 rotates, it drives the airflow in the volute 100 to flow out from the air outlet 120 along the radial direction of the impeller 200. At the same time, the guide holes 510 provide a direction-limited channel for the incoming air flow, so that the incoming air flow can enter the volute 100 along the tapered direction of the conical air inlet channel 400, thereby avoiding the incoming air flow from generating vortices at the inner wall of the conical air inlet channel 400, preventing the incoming air flow from entering the volute 100 and colliding strongly with the impeller 200 to generate noise, thereby reducing the noise generated when the fan is running.

[0025] Furthermore, the axis of the guide hole 510 is an arc that protrudes from the center to the edge of the guide plate 500, so that the incoming air flow flows along an arc trajectory in the guide hole 510. On the one hand, it can change the incoming air flow trajectory so that the air flow flowing out of the guide hole 510 can enter the volute 100 along the taper direction of the conical air inlet channel 400. On the other hand, it can slow down the flow rate of the incoming air flow, thereby further reducing the noise generated when the fan is running.

[0026] It should be noted that the closer to the center of the guide plate 500 , the smaller the curvature of the axis of the guide hole 510 .

[0027] Furthermore, a sound-absorbing layer 520 is provided on the inner surface of the guide hole 510. Specifically, the sound-absorbing layer 520 can be made of internally foamed non-metallic materials such as silicone, EPDM rubber, polyurethane, etc., so that it can play a role in sound absorption and at the same time reduce the overall weight of the fan.

[0028] Furthermore, the sound-absorbing layer 520 is detachably mounted on the inner surface of the air guide hole 510 by gluing, thereby facilitating installation and removal.

[0029] In some preferred embodiments, an opening 530 is provided at the center of the guide plate 500 .

[0030] It should be noted that the size of the opening 530 is specifically set according to the air intake volume required by the fan.

[0031] When the fan requires a large amount of air intake, a larger opening 530 size can be set so that the air intake airflow in the middle part enters the volute 100 through the opening 530 at the center of the guide plate 500, and the air intake airflow at the edge part enters the volute 100 through several guide holes 510 on the guide plate 500. On the one hand, it can meet the air intake volume requirement of the fan, and on the other hand, it can greatly reduce the generation of vortexes.

[0032] When the required air intake volume of the fan is small, a smaller opening 530 size can be set so that a small part of the intake air flow enters the volute 100 through the opening 530, while most of the intake air flow enters the volute 100 through the several guide holes 510 on the guide plate 500. The opening 530 at the center of the guide plate 500 can even be closed so that all the intake air flow passes through the several guide holes 510 on the guide plate 500 into the volute 100, thereby greatly enhancing the noise reduction effect.

[0033] In some preferred embodiments, a filter 600 is provided on the side of the guide plate 500 away from the volute 100. The incoming air flow first passes through the filter 600 and then enters the volute 100 through the guide hole 510 on the guide plate 500. The filter 600 can filter dust and impurities in the incoming air flow, thereby improving the cleanliness of the outlet air flow of the fan.

[0034] Structurally, the air inlet 110, the guide plate 500 and the filter 600 are all circular structures. The edge of the filter 600 is pressed against the edge of the guide plate 500 by the annular pressure plate 700, thereby preventing the edge of the filter 600 from warping and ensuring the firmness of the installation of the filter 600.

[0035] Furthermore, the annular pressure plate 700 and the guide plate 500 are fixed to the volute 100 by a plurality of bolts 800, thereby facilitating the assembly and disassembly of the filter screen 600 and the guide plate 500, and making it convenient to disassemble the filter screen 600 for cleaning.

[0036] Specifically, a plurality of first mounting holes 710 are provided on the annular pressure plate 700, and a plurality of second mounting holes 540 are provided on the guide plate 500. The first mounting holes 710 correspond one-to-one to the plurality of second mounting holes 540. A plurality of threaded holes 130 are provided on the volute 100. The plurality of second mounting holes 540 correspond one-to-one to the plurality of threaded holes 130. Both the first mounting holes 710 and the second mounting holes 540 allow bolts 800 to pass through, and the bolts 800 are threadedly connected to the threaded holes 130. During installation, one end of the bolt 800 passes through the first mounting hole 710 and the second mounting hole 540 in sequence and then is threadedly connected to the threaded hole 130. This facilitates the processing of parts, saves processing costs, and facilitates installation.

[0037] In some preferred embodiments, a flange 410 is provided at one end of the conical air inlet channel 400 close to the air inlet 110, and the flange 410 is provided with a plurality of third mounting holes 420. The plurality of third mounting holes 420 correspond one-to-one to the plurality of threaded holes 130. The third mounting holes 420 allow the bolts 800 to pass through. The flange 410 is located between the guide plate 500 and the volute 100. During installation, one end of the bolt 800 passes through the first mounting hole 710, the second mounting hole 540 and the third mounting hole 420 in sequence and then is threadedly connected to the threaded hole 130. Thus, the installation of the filter 600, the guide plate 500 and the conical air inlet channel 400 can be realized at the same time, thereby improving the assembly efficiency. Moreover, it can also save the number of fasteners used and reduce the manufacturing cost of the equipment.

[0038] The above is a specific description of the preferred implementation of the present invention, but the invention of the present invention is not limited to the embodiments. Those skilled in the art can make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A noise reduction fan, characterized in that: It includes a volute, an impeller installed in the volute, and a motor for driving the impeller to rotate. The volute is provided with an air inlet along the axial side of the impeller, and the volute is provided with an air outlet along the radial side of the impeller. The air inlet is connected to a conical air inlet channel, and the diameter of the conical air inlet channel gradually increases from the inside to the outside. The air inlet is provided with a guide plate, and a plurality of guide holes are opened on the guide plate. The guide holes are used to guide the incoming air flow into the volute along the taper direction of the conical air inlet channel.

2. A noise reduction fan according to claim 1, characterized in that: The axis of the guide hole is an arc line protruding from the center to the edge of the guide plate.

3. A noise reduction fan according to claim 1, characterized in that: The inner surface of the guide hole is provided with a sound-absorbing layer.

4. A noise reduction fan according to claim 1, characterized in that: An opening is provided at the center of the guide plate.

5. The noise reduction fan according to claim 1, characterized in that: A filter screen is provided on one side of the guide plate away from the volute.

6. A noise reduction fan according to claim 5, characterized in that: The air inlet, the guide plate and the filter screen are all circular structures.

7. A noise reduction fan according to claim 6, characterized in that: The edge of the filter screen is pressed against the edge of the guide plate through an annular pressing plate.

8. The noise reduction fan according to claim 7, characterized in that: The annular pressure plate and the guide plate are fixed to the volute by a plurality of bolts.

9. The noise reduction fan according to claim 8, characterized in that: The annular pressure plate is provided with a plurality of first mounting holes, and the guide plate is provided with a plurality of second mounting holes, and the plurality of first mounting holes corresponds one-to-one to the plurality of second mounting holes. The volute is provided with a plurality of threaded holes, and the plurality of second mounting holes corresponds one-to-one to the plurality of threaded holes. Both the first mounting holes and the second mounting holes allow the bolts to pass through, and the bolts are threadedly connected to the threaded holes.

10. The noise reduction fan according to claim 9, characterized in that: A flange is provided at one end of the conical air inlet channel close to the air inlet, and a plurality of third mounting holes are provided on the flange. The plurality of third mounting holes correspond one-to-one to the plurality of threaded holes, and the third mounting holes allow the bolts to pass through.

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