Centrifugal fan

Abstract

The centrifugal fan comprises a shell, a first installation groove and a second installation groove are formed in the two opposite ends of the shell respectively, a motor is arranged in the second installation groove, and the output end of the motor penetrates through the second installation groove and extends into the first installation groove to be connected with an impeller. An annular flow channel is formed in the inner wall of the first mounting groove and located on the peripheral side of the impeller, and the annular flow channel and the shell are designed to be of an integrated structure, so that the problem of air pressure leakage during working of the centrifugal fan is avoided, and stable working efficiency is guaranteed; meanwhile, a fairing is detachably installed on the opening side of the annular flow channel through a screw and used for dividing and rectifying axial vortex wind pressure sucked in when the impeller rotates, so that impact vibration and noise caused by airflow to the shell are reduced; and the reinforcing ring is fixedly mounted on the periphery of the impeller, so that the reinforcing ring is rotationally connected with the fairing, the connecting strength between the impeller and the shell is enhanced, stable rotation of the impeller is guaranteed, and vibration noise is further reduced.

Description

Technical Field

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

[0002] Based on the principle of converting kinetic energy into potential energy, centrifugal fans can use high-speed rotating impellers to accelerate the gas, then slow down and change the flow direction, so that the kinetic energy is converted into potential energy, which can increase the gas pressure and discharge the gas. Since the impeller of the centrifugal fan has problems of jumping along the shaft and shaking along the radial direction when rotating, sufficient gap must be left between the impeller of the centrifugal fan and the inner wall of the volute to prevent the impeller from scraping and colliding with the volute during operation. However, the working pressure difference of the centrifugal fan is large, especially between the air inlet and outlet of the centrifugal fan. Due to the existence of the gap between the impeller and the volute of the centrifugal fan, the air pressure leakage problem is relatively serious when the centrifugal fan is working, which will not only reduce the air volume and affect the working efficiency of the centrifugal fan, but also generate a lot of working noise. Summary of the invention

[0003] In view of this, an object of the present invention is to provide a centrifugal fan to solve the technical problems mentioned in the prior art.

[0004] A centrifugal fan comprises a housing, an impeller installed inside the housing, and a motor driving the impeller to rotate, wherein the housing is provided with a first mounting groove and a second mounting groove at opposite ends thereof, the motor is arranged in the second mounting groove, and an output end of the motor passes through the second mounting groove and extends into the first mounting groove to be connected with the impeller;

[0005] An annular flow channel is provided on the inner wall of the first mounting groove and located on the outer peripheral side of the impeller, and a fairing is provided on the opening side of the annular flow channel, and the fairing is sleeved on the outer peripheral side of the impeller;

[0006] An air outlet is arranged on the inner wall of the annular flow channel along the tangential direction;

[0007] A reinforcement ring is arranged on the outer periphery of the impeller, and the reinforcement ring is rotatably connected to the fairing.

[0008] Optionally, an annular groove is provided on the outer periphery of the reinforcement ring, and a plurality of air supply ports are evenly provided on the inner periphery of the reinforcement ring along the circumferential direction, and the air supply ports penetrate the annular groove to be connected to the fairing.

[0009] Optionally, at least one air outlet is provided between two adjacent blades of the impeller.

[0010] Optionally, the reinforcement ring is rotatably connected to the fairing via a ball bearing;

[0011] Part of the surface of the ball is embedded in the outer periphery of the reinforcing ring;

[0012] A chute is provided on the inner wall of the fairing, and the remaining part of the ball rolls in the chute.

[0013] Optionally, the fairing is a filter plate structure.

[0014] Optionally, a pressing ring is provided on the opening side of the fairing close to the first mounting groove, and the inner periphery of the pressing ring extends horizontally to the inner peripheral side of the reinforcing ring.

[0015] Optionally, a dust cover is provided at the opening end of the second mounting groove.

[0016] Optionally, an eddy current groove is provided on the inner wall of the annular flow channel on the side close to the second mounting groove.

[0017] The beneficial effects that the present utility model can produce include:

[0018] A centrifugal fan provided by the present utility model, by designing the annular flow channel and the housing as an integral structure, can avoid the problem of air pressure leakage during the operation of the centrifugal fan, and ensure stable working efficiency; at the same time, a fairing is detachably installed by screws at the opening side of the annular flow channel, which is used to divide and rectify the axial eddy current air pressure inhaled when the impeller rotates, so as to slow down the impact vibration and noise caused by the air flow to the housing; and a reinforcing ring is fixedly installed on the outer periphery of the impeller to rotatably connect the reinforcing ring with the fairing, which is used to enhance the connection strength between the impeller and the housing, ensure the stable rotation of the impeller, and further reduce vibration and noise. Description of the Drawings

[0019] Figure 1 is a schematic structural diagram of a centrifugal fan of the present utility model;

[0020] Figure 2 In the present utility model Figure 1 schematic diagram of the internal structure;

[0021] Figure 3 In the present utility model Figure 2 schematic diagram of the structure of the reinforcing ring;

[0022] In the figure: 1, housing; 2, impeller; 3, motor; 4, first mounting groove; 5, second mounting groove; 6, annular flow channel; 7, fairing; 8, air outlet; 9, reinforcing ring; 10, annular groove; 11, air supply port; 12, pressing ring; 13, dust cover; 14, eddy current groove. Detailed Embodiments

[0023] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0024] Please refer to Figures 1 - 3 As shown, the present utility model provides a centrifugal fan, which includes a housing 1, an impeller 2 installed inside the housing 1, and a motor 3 for driving the impeller 2 to rotate. First installation grooves 4 and second installation grooves 5 are respectively opened at opposite ends of the housing 1. The motor 3 is disposed in the second installation groove 5, and the output end of the motor 3 penetrates through the second installation groove 5 and extends into the first installation groove 4 to be connected to the impeller 2. An annular flow channel 6 is opened on the inner wall of the first installation groove 4 and on the outer peripheral side of the impeller 2. The opening side of the annular flow channel 6 is detachably installed with a fairing 7 through screws. The fairing 7 is sleeved on the outer peripheral side of the impeller 2 and is used for dividing and rectifying the axial eddy current air pressure inhaled when the impeller 2 rotates, so as to slow down the impact vibration and noise caused by the airflow on the housing 1, and by designing the annular flow channel 6 and the housing 1 as an integral structure, to avoid the problem of air pressure leakage during the operation of the centrifugal fan and ensure the stable working efficiency; an air outlet 8 is arranged on the inner side wall of the annular flow channel 6 along the tangential direction to convey the decompressed airflow to the load through the air outlet 8; a reinforcing ring 9 is fixedly installed on the outer periphery of the impeller 2, and the reinforcing ring 9 is rotatably connected to the fairing 7, which is used to enhance the connection strength between the impeller 2 and the housing 1, ensure the stable rotation of the impeller 2, and reduce vibration noise.

[0025] In the above, an annular groove 10 is arranged on the outer periphery of the reinforcing ring 9, and a plurality of air supply ports 11 are evenly arranged along the circumferential direction on the inner periphery of the reinforcing ring 9. The air supply ports 11 penetrate through the annular groove 10 to communicate with the fairing 7, so as to form an annular air gathering cavity between the reinforcing ring 9 and the fairing 7, further reducing the problem of air pressure leakage during the operation of the centrifugal fan and effectively ensuring the air supply volume of the impeller 2. Specifically, at least one air supply port 11 is arranged between adjacent two blades of the impeller 2 to avoid the phenomenon of turbulent flow inside the impeller 2.

[0026] In the above, the reinforcing ring 9 and the fairing 7 are rotatably connected through balls; wherein, a part of the surface of the balls is embedded on the outer periphery of the reinforcing ring 9, and a sliding groove is opened on the inner wall of the fairing 7, and the remaining part of the balls rolls in the sliding groove. By using the rolling connection of the bearing, it can reduce wear and improve the service life.

[0027] Furthermore, the fairing 7 is a filter plate structure, enabling it to filter large particle impurities while rectifying. Among them, a compression ring 12 is installed on the opening side of the fairing 7 close to the first installation groove 4 to enhance the fixing effect of the fairing 7. The inner peripheral edge of the compression ring 12 extends horizontally to the inner peripheral side of the reinforcement ring 9 to reduce gas leakage between the connection points of the reinforcement ring 9 and the fairing 7, thereby ensuring normal air output of the centrifugal fan; a vortex groove 14 is provided on one side of the inner wall of the annular flow passage 6 close to the second installation groove 5 to perform vortex pressurization on the gas entering the annular flow passage 6, improving the working efficiency of the centrifugal fan. A dust cover 13 is installed at the opening end of the second installation groove 5 to prevent dust from adhering to the casing of the motor 3 and improve the heat dissipation effect of the motor 3.

Claims

1. A centrifugal fan, comprising a housing (1), an impeller (2) installed inside the housing (1), and a motor (3) for driving the impeller (2) to rotate, characterized in that, At opposite ends of the housing (1), a first mounting groove (4) and a second mounting groove (5) are respectively provided. The motor (3) is disposed in the second mounting groove (5), and the output end of the motor (3) penetrates through the second mounting groove (5) and extends into the first mounting groove (4) to be connected to the impeller (2). On the inner wall of the first mounting groove (4) and on the outer peripheral side of the impeller (2), an annular flow passage (6) is provided. An air guide cover (7) is provided on the opening side of the annular flow passage (6), and the air guide cover (7) is sleeved on the outer peripheral side of the impeller (2). An air outlet (8) is provided on the inner side wall of the annular flow passage (6) along the tangential direction. A reinforcing ring (9) is provided on the outer periphery of the impeller (2), and the reinforcing ring (9) is rotatably connected to the air guide cover (7).

2. The centrifugal fan according to claim 1, characterized in that, An annular groove (10) is provided on the outer periphery of the reinforcing ring (9), and a plurality of air supply openings (11) are uniformly arranged along the circumferential direction on the inner periphery of the reinforcing ring (9). The air supply openings (11) penetrate through the annular groove (10) to communicate with the air guide cover (7).

3. The centrifugal fan according to claim 2, characterized in that, At least one air supply opening (11) is provided between two adjacent blades of the impeller (2).

4. The centrifugal fan according to claim 1, characterized in that, The reinforcing ring (9) and the air guide cover (7) are rotatably connected by balls. Part of the surface of the ball is embedded on the outer periphery of the reinforcing ring (9). A chute is provided on the inner wall of the air guide cover (7), and the remaining part of the ball rolls in the chute.

5. A centrifugal fan according to claim 1, characterized in that, The air guide cover (7) is a filter plate structure.

6. A centrifugal fan according to claim 1, characterized in that, A pressing ring (12) is provided on the opening side of the air guide cover (7) close to the first mounting groove (4), and the inner periphery of the pressing ring (12) extends horizontally to the inner peripheral side of the reinforcing ring (9).

7. The centrifugal fan according to claim 1, wherein A dust cover (13) is provided at the opening end of the second mounting groove (5).

8. A centrifugal fan according to claim 1, characterized in that, An eddy current groove (14) is provided on the inner wall of the annular flow passage (6) on the side close to the second mounting groove (5).

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