Centrifugal fan

Abstract

The utility model discloses a centrifugal fan which comprises a noise reduction supporting plate, a driving motor, fan blades and a volute. The driving motor is arranged on one side of the noise reduction supporting plate; the fan blades are located on the other side of the noise reduction supporting plate, and the fan blades are rotationally arranged at the driving end of the driving motor; the volute is arranged on one side of the reduction cover supporting plate. An air cavity is formed in one side of the volute and covers the outer sides of the fan blades; an air inlet communicated with the air cavity is formed in the other side of the volute; and an air outlet pipe communicated with the air cavity is arranged on the volute. According to the utility model, the noise generated in the working process of the fan can be effectively reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to fan technical field, concretely relates to a centrifugal fan. BACKGROUND

[0002] Centrifugal fan is the mechanical that the input mechanical energy is relied on, improves gas pressure and sends gas, it is a driven fluid machinery. Centrifugal fan is widely used in factory, mine, tunnel, cooling tower, vehicle, ship and building's ventilation, dust removal and cooling, boiler and industrial furnace's ventilation and air entrainment, air conditioning equipment and household appliance equipment in cooling and ventilation, grain's drying and selection and delivery, wind tunnel wind source and air cushion ship's inflation and propulsion etc.

[0003] Centrifugal fan usually needs to use motor, and the working sound of motor is loud, which often produces large noise. UTILITY MODEL CONTENTS

[0004] The utility model provides a centrifugal fan that can reduce noise to solve above-mentioned technical problem.

[0005] The utility model discloses a centrifugal fan that can reduce noise to solve above-mentioned technical problem.

[0006] A centrifugal fan, including the support plate of reducing noise, drive motor, fan blade and volute, drive motor is arranged in one side of the support plate of reducing noise, the fan blade is located in the other side of the support plate of reducing noise, and the fan blade rotation is arranged in the drive end of drive motor, the volute is arranged in one side of the support plate of reducing cover, one side of the volute is provided with the air cavity, the air cavity cover is arranged on the outside of the fan blade, the other side of the volute is provided with the air inlet that communicates with the air cavity, the volute is provided with the air outlet pipe that communicates with the air cavity.

[0007] Preferably, one side of the support plate of reducing noise is provided with the noise reduction spacer, one end of the drive motor is fixed in one side of the noise reduction spacer by bolt, and the end of the drive motor and the support plate of reducing noise are fixed by bolt.

[0008] Preferably, one side of the drive motor is provided with the shaft hole, the drive end of the drive motor is connected with the fan blade rotation through the shaft hole, a plurality of noise reduction cavities are evenly arranged on the noise reduction spacer, and the noise reduction cavities surround the shaft hole.

[0009] Preferably, the inner side of the air cavity is provided with the sealing ring, the sealing ring and the opening edge of the air cavity form the sealing groove, one side of the support plate of reducing noise is provided with the sealing step, the sealing step is covered in the sealing groove, one side of the sealing step is provided with the sealing pad, and the outer side of the sealing pad is clamped in the inner side wall of the sealing ring.

[0010] Preferably, the fan blade comprises a base plate and a fan platform; one side of the sealing gasket is provided with a noise reduction groove, the base plate is rotationally arranged in the noise reduction groove; the fan platform is integrally arranged on one side of the base plate; a plurality of blades are uniformly arranged around the fan platform from the top of the base plate to the fan platform; flow channels are formed between adjacent blades.

[0011] Preferably, the blade is in an elongated S-shaped structure; each blade is provided with a fan piece near the top of the fan platform; the fan piece is twisted to one side and covers the top of an adjacent flow channel; the twisted edges of all the fan pieces fall on the same horizontal plane to form a circular shape; the air inlet is arranged outside the fan pieces and the circular surface formed by the fan pieces.

[0012] Preferably, the air cavity is provided with a flow guide cover; the flow guide cover is in communication with the air inlet; the flow guide cover is arranged outside the blades and the flow channels.

[0013] The centrifugal fan has the advantages that: the noise reduction support plate is arranged, the noise generated when the driving end of the driving motor and the connecting part of the fan blade rotate is reduced through the separation effect, and the noise generated by air flow is reduced by sealing one side of the air cavity. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 The centrifugal fan side display figure disclosed in the embodiment of the utility model is shown in the figure.

[0015] Figure 2 The centrifugal fan volute face display figure (without motor) disclosed in the embodiment of the utility model is shown in the figure.

[0016] Figure 3 The centrifugal fan volute face display figure (without motor) disclosed in the embodiment of the utility model is shown in the figure. Figure 2 The centrifugal fan volute face display figure (without motor) disclosed in the embodiment of the utility model is shown in the figure.

[0017] Figure 4 The centrifugal fan volute face display figure (without motor) disclosed in the embodiment of the utility model is shown in the figure. Figure 3 The centrifugal fan volute face display figure (without motor) disclosed in the embodiment of the utility model is shown in the figure.

[0018] Figure 5 The centrifugal fan noise reduction support plate face display figure (without motor) disclosed in the embodiment of the utility model is shown in the figure.

[0019] Figure 6 The centrifugal fan noise reduction support plate face display figure (without motor) disclosed in the embodiment of the utility model is shown in the figure. Figure 5 The centrifugal fan noise reduction support plate face display figure (without motor) disclosed in the embodiment of the utility model is shown in the figure.

[0020] Figure 7 The centrifugal fan noise reduction support plate face display figure (without motor) disclosed in the embodiment of the utility model is shown in the figure. Figure 6 The centrifugal fan noise reduction support plate face display figure (without motor) disclosed in the embodiment of the utility model is shown in the figure.

[0021] Figure 8 The centrifugal fan front display figure disclosed in the embodiment of the utility model is shown in the figure.

[0022] Identifying description: 1-noise reduction support plate, 2-driving motor, 3-fan blade, 31-chassis, 32-fan platform, 33-blade, 34-fan piece, 4-volute, 5-inlet, 6-outlet pipe, 7-noise reduction spacer, 8-noise reduction cavity, 9-sealing ring, 10-sealing step, 11-sealing pad, 12-noise reduction groove, 13-duct, 14-sound absorbing hole, 15-strengthening block, 16-convex ring. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the utility model more clearly, the following will be further described in detail in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the utility model, and are not used to limit the utility model. It should be noted that when an element is referred to as "fixed to" or "provided on" another element, it can be directly on another element or there can be a middle element. When an element is referred to as "connected to" another element, it can be directly connected to another element or there can be a middle element. When an element is referred to as "fixedly connected to" another element, it can be fixedly connected to another element by means of common fixed connection modes such as welding or bolt connection or adhesive connection.

[0024] Please refer to Figures 1-8 The utility model discloses a centrifugal fan in preferred embodiment, including noise reduction support plate 1, driving motor 2, fan blade 3 and volute 4, driving motor 2 sets up one side of noise reduction support plate 1, fan blade 3 is located the other side of noise reduction support plate 1, and fan blade 3 rotation setting is driven end of driving motor 2, volute 4 sets up one side of noise reduction support plate 1, one side of volute 4 is provided with wind cavity, and the wind cavity cover is set up the outside of fan blade 3, another side of volute 4 is provided with the air inlet 5 that communicates with wind cavity, be provided with the outlet pipe 6 that communicates with wind cavity on volute 4.

[0025] Specifically, one side of noise reduction support plate 1 is provided with noise reduction spacer 7, one end of driving motor 2 is fixed in one side of noise reduction spacer 7 by bolt, and the end of driving motor 2 and noise reduction support plate 1 are fixed by bolt. Driving motor 2 is connected and fixed with noise reduction support plate, and then is connected and fixed with noise reduction spacer 7, which strengthens the installation stability of driving motor 2, reduces the vibration of driving motor 2 itself when working, and further reduces the noise.

[0026] Specifically, one side of the driving motor 2 is provided with a shaft hole; the driving end of the driving motor 2 is rotatably connected with the fan blade 3 through the shaft hole; a plurality of noise reduction cavities 8 are uniformly arranged on the noise reduction spacer 7; and the noise reduction cavities 8 are arranged around the shaft hole. The noise reduction spacer 7 and the noise reduction cavity 8 can effectively reduce the noise generated when the driving end of the driving motor 2 and the connecting part of the fan blade 3 rotate.

[0027] Specifically, the inner side of the air cavity is provided with a sealing ring 9; the sealing ring 9 and the opening edge of the air cavity form a sealing groove; one side of the noise reduction support plate 1 is provided with a sealing step 10, the sealing step 10 is covered in the sealing groove; one side of the sealing step 10 is provided with a sealing pad 11; the outer side of the sealing pad 11 is clamped in the inner side wall of the sealing ring 9. The noise reduction support plate 1 tightly seals one side of the air cavity, avoiding the wind from escaping from the gap when the centrifugal fan is working, which affects the working efficiency of the centrifugal fan.

[0028] Specifically, the fan blade 3 includes a bottom disc 31 and a fan platform 32; one side of the sealing pad 11 is provided with a noise reduction groove 12, and the bottom disc 31 is rotatably arranged in the noise reduction groove 12; the fan platform 32 is integrally arranged on one side of the bottom disc 31; a plurality of blades 33 are uniformly arranged around the fan platform 32 from the bottom disc 31 to the top of the fan platform 32; and flow channels are formed between adjacent blades 33. There is a gap between the noise reduction groove 12 and the bottom disc 31, which further reduces the noise generated when the driving end of the driving motor 2 and the connecting part of the bottom disc 31 rotate.

[0029] Specifically, the blade 33 is in an elongated S-shaped structure; each blade 33 is provided with a fan blade 34 near the top of the fan platform; the fan blade 34 is twisted to cover the top of an adjacent flow channel; the twisted edges of all the fan blades 34 fall on the same horizontal plane to form a circular shape; and the air inlet 5 is arranged outside the fan blades 34 and the circular surface formed by the fan blades 34. Figure 8 As shown, the wind is mainly sucked into the flow channel from the gap between the two adjacent fan blades 34, greatly reducing the possibility of wind escaping from the inlet during air suction.

[0030] Specifically, a flow guide cover 13 is arranged in the air cavity; the flow guide cover 13 is in communication with the air inlet 5; and the flow guide cover 13 is arranged outside the blade 33 and the flow channel. Figure 6 As shown, the wind of each flow channel has little influence on each other before being discharged from the outlet formed between the flow channel, the blade 33 and the flow guide cover 13, which avoids the wind being sucked into the air cavity from being disturbed before entering the air cavity, thereby ensuring the working performance of the centrifugal fan.

[0031] Specifically, the noise reduction groove 12 is provided with sound absorbing holes 14, further absorbing and reducing the noise generated when the driving end of the driving motor 2 and the connecting part of the chassis 31 rotate.

[0032] Specifically, the outer side of the volute 4 is uniformly provided with reinforcing blocks 15 to improve the structural strength of the volute 4.

[0033] Specifically, the inner wall of the air cavity is provided with a concave-convex ring 16 for noise reduction to reduce the noise generated when the air collides and rubs with the cavity wall of the air cavity.

[0034] From the above description, it can be known that the utility model can effectively reduce the noise generated in the working process of the fan.

[0035] The preferred embodiments of the utility model are described in detail in combination with the drawings of the specification, and it should be explained that the protection scope of the utility model includes but is not limited to the above-mentioned embodiments; the specific structure disclosed in the drawings of the specification is only a preferred embodiment of the utility model, and the skilled in the art can also develop other embodiments on the basis, any simple transformation or equivalent replacement without departing from the innovative concept of the utility model is covered in the utility model and belongs to the protection scope of the utility model.

Claims

1. A centrifugal fan characterized by comprising: The utility model relates to a fan, including: Noise reduction support plate; Driving motor; The driving motor is arranged on one side of the noise reduction support plate; Fan blade; The fan blade is located on the other side of the noise reduction support plate, and the fan blade is rotationally arranged on the driving end of the driving motor; Spiral case; the spiral case is arranged on one side of the noise reduction support plate; one side of the spiral case is provided with a wind cavity, the wind cavity is covered on the outside of the fan blade; the other side of the spiral case is provided with an air inlet communicated with the wind cavity; the spiral case is provided with an air outlet pipe communicated with the wind cavity.

2. A centrifugal fan as claimed in claim 1, characterized in that: One side of the noise reduction support plate is provided with a noise reduction spacer; one end of the driving motor is fixed on one side of the noise reduction spacer through bolts, and the end of the driving motor and the noise reduction support plate are fixed through bolts.

3. A centrifugal fan as claimed in claim 2, characterised in that: One side of the driving motor is provided with a shaft hole; the driving end of the driving motor passes through the shaft hole and is rotationally connected with the fan blade; a plurality of noise reduction cavities are uniformly arranged on the noise reduction spacer; the noise reduction cavities surround the shaft hole.

4. A centrifugal fan as claimed in claim 1, characterized in that: The inner side of the wind cavity is provided with a sealing ring; the sealing ring and the opening edge of the wind cavity form a sealing groove; one side of the noise reduction support plate is provided with a sealing step, the sealing step is covered in the sealing groove; one side of the sealing step is provided with a sealing pad; the outer side of the sealing pad is clamped in the inner side wall of the sealing ring.

5. A centrifugal fan as claimed in claim 4, characterised in that: The fan blade includes a bottom disc and a fan platform; one side of the sealing pad is provided with a noise reduction groove, the bottom disc is rotationally arranged in the noise reduction groove; the fan platform is integrally arranged on one side of the bottom disc; a plurality of blades are uniformly arranged around the fan platform from the bottom disc to the top of the fan platform; flow channels are formed between adjacent blades.

6. A centrifugal fan as claimed in claim 5, characterised in that: The blade is in an elongated S-shaped structure; each blade is provided with a fan piece near the top of the fan platform; the fan piece is twisted to cover above an adjacent flow channel; the twisted edges of all the fan pieces fall on the same horizontal plane to form a circle; the air inlet is surrounded outside the fan piece and the circular surface formed by the fan pieces.

7. A centrifugal fan as claimed in claim 6, characterised in that: The wind cavity is provided with a flow guide cover; the flow guide cover is communicated with the air inlet; the flow guide cover is surrounded outside the blade and the flow channel.

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