CN219509861U - High-ventilation low-noise centrifugal ventilator - Google Patents

Abstract

The utility model relates to the technical field of ventilation equipment, in particular to a high-ventilation low-noise centrifugal ventilator which comprises a casing, an air inlet arranged on one side of the casing, an air outlet arranged on the top of the casing, a main shaft transversely inserted in the center of the air inlet, a multi-wing wind wheel fixed on the main shaft and a driving mechanism for driving the main shaft to rotate, wherein an axial-flow wind wheel is fixedly arranged at the front end of the main shaft, the multi-wing wind wheel comprises a mounting frame and a plurality of blades which are annularly arranged on the outer edge of the mounting frame, the blades are arc-shaped, a plurality of saw teeth which are sequentially and continuously arranged are arranged on the outer edge of the blades, and the saw teeth are triangular. According to the utility model, the outer edges of the blades of the multi-wing wind wheel are provided with the plurality of saw teeth which are sequentially and continuously arranged, the saw teeth are triangular, so that the fluid flow near the tail edge of the fan blade can be improved, the vortex breaking effect is generated on vortex formed in the fluid movement process, and the pneumatic noise generated by the blades is reduced.

Description

High-ventilation low-noise centrifugal ventilator

Technical Field

The utility model relates to the technical field of ventilation equipment, in particular to a high-ventilation low-noise centrifugal ventilator.

Background

Centrifugal fans are widely applied to numerous fields such as catering, factories and basements, and a plurality of blades are axially arranged on a mounting frame to form a multi-wing through-flow structure, so that the fans are generally noisier. The noise of the centrifugal fan can be classified into two types according to the mechanism of generation: one type is pressure pulsation due to the non-uniformity of the air flow at the air outlet side of the blades and periodically acting on the surrounding medium, thereby forming rotational noise.

The Chinese patent of application number 202222985307.4 discloses a centrifugal ventilator with a preposed axial flow wind wheel at an air inlet, wherein the axial flow wind wheel is arranged in the air inlet of a multi-wing wind wheel, the preposed axial flow wind wheel is utilized to lead air to form prerotation with consistent wind wheel rotation so as to obtain the optimal cross section, thereby improving the characteristics of the wind wheel, reducing the friction loss and vortex loss of air at the inlet of the wind wheel, improving the efficiency, reducing the noise, and leading the air entering the inlet of the multi-wing wind wheel to be pressurized air, thereby improving the pressure of the fan, leading the fan to have the characteristics of high ventilation efficiency, high ventilation pressure and the like, and achieving the effect of one plus one to be more than two. However, this patent still has the problem of loud centrifugal fan noise.

Disclosure of Invention

In order to overcome the defects and shortcomings in the prior art, the utility model aims to provide a centrifugal ventilator with high ventilation and low noise.

The aim of the utility model is achieved by the following technical scheme: the utility model provides a centrifugal fan of high ventilation low noise, includes the casing, sets up in the air intake of casing one side, sets up in the air outlet at casing top, transversely inserts the main shaft of locating air intake central authorities, is fixed in the epaxial multi-wing wind wheel of main and is used for driving the rotatory actuating mechanism of main shaft, is located the front end fixed mounting of multi-wing wind wheel on the main shaft and has axial flow wind wheel, multi-wing wind wheel includes mounting bracket and annular array installs in a plurality of blades on the mounting bracket outer edge, the blade is circular-arc, and a plurality of sawtooth of arranging in proper order have been seted up on the outer edge of blade, and the shape of sawtooth is triangle-shaped.

Further, the driving mechanism comprises a motor, a driving wheel fixed at the output end of the motor, a driven wheel fixed at one end of the main shaft and a belt connected between the driving wheel and the driven wheel.

Further, a first bearing seat is fixed at the air inlet, a second bearing seat is fixed at the outer part of the shell corresponding to the first bearing seat, and two ends of the main shaft are sleeved in the first bearing seat and the second bearing seat respectively.

Further, the outside cover of belt is equipped with the protection casing.

Further, the saw teeth are isosceles triangle in shape.

Further, the saw teeth are in the shape of equilateral triangles.

Further, the depth of the saw teeth gradually decreases along the direction from the air inlet to the air outlet.

Further, the tops of the saw teeth are provided with round corners.

The utility model has the beneficial effects that: according to the utility model, the axial-flow wind wheel is arranged in the air inlet of the multi-wing wind wheel, and the front-arranged axial-flow wind wheel is utilized to enable air to form prerotation with consistent wind wheel steering. Because the multi-wing wind wheel can select a larger inlet angle, the optimal cross section is obtained to improve the characteristics of the wind wheel, reduce the friction loss and the vortex loss of gas at the inlet of the wind wheel, improve the efficiency of the fan and reduce the noise of the fan. Meanwhile, the preposed axial flow wind wheel is equivalent to the addition of the first-stage wind wheel, so that air entering the inlet of the multi-wing wind wheel is pressurized, the pressure of the fan is obviously improved, and the fan has the characteristics of high ventilation efficiency, high ventilation pressure and the like.

According to the centrifugal ventilator disclosed by the utility model, the outer edges of the blades of the multi-wing wind wheel are provided with the plurality of saw teeth which are sequentially and continuously arranged, the saw teeth are triangular, so that the fluid flow near the tail edges of the blades of the ventilator can be improved, vortex breaking effect is generated on vortex formed in the fluid movement process, and the pneumatic noise generated by the blades is reduced; when the saw teeth pass through the fluid, the rectification effect can be achieved, the flow loss is reduced, and the efficiency of the fan is improved; meanwhile, the weight of the blade is also reduced, the working energy consumption of the blade is effectively reduced, and the technical effects of energy conservation and dryness reduction are achieved.

Drawings

Fig. 1 is a schematic structural view of the present utility model.

Fig. 2 is a side view of the present utility model.

Fig. 3 is a perspective view of an axial flow wind turbine according to the present utility model.

Fig. 4 is a schematic structural view of the multi-wing wind wheel according to the present utility model.

Figure 5 is a side view of a multiple wing wind turbine according to the present utility model.

FIG. 6 is a graph of the noise contrast of the present utility model with a conventional blade.

The reference numerals are: the wind turbine comprises a shell 1, an air inlet 11, an air outlet 12, a main shaft 2, a multi-wing wind wheel 3, a mounting frame 31, blades 32, saw teeth 321, an axial flow wind wheel 4, a motor 51, a driving wheel 52, a driven wheel 53, a belt 54, a first bearing seat 61, a second bearing seat 62 and a protective cover 63.

Detailed Description

The present utility model is further described below with reference to examples and fig. 1-6, which are not intended to be limiting, for the purpose of facilitating understanding of those skilled in the art.

Referring to fig. 1-6, a centrifugal ventilator with high ventilation and low noise comprises a casing 1, an air inlet 11 arranged at one side of the casing 1, an air outlet 12 arranged at the top of the casing 1, a main shaft 2 transversely inserted in the center of the air inlet 11, a multi-wing wind wheel 3 fixed on the main shaft 2, and a driving mechanism for driving the main shaft 2 to rotate, wherein an axial-flow wind wheel 4 is fixedly arranged at the front end of the multi-wing wind wheel 3 on the main shaft 2, the multi-wing wind wheel 3 comprises a mounting frame 31 and a plurality of blades 32 arranged at the outer edge of the mounting frame 31 in an annular array, the blades 32 are in an arc shape, a plurality of saw teeth 321 sequentially and continuously arranged are arranged at the outer edge of the blades 32, and the saw teeth 321 are triangular.

According to the centrifugal ventilator disclosed by the utility model, the outer edges of the blades 32 of the multi-wing wind wheel 3 are provided with the plurality of saw teeth 321 which are sequentially and continuously arranged, the saw teeth 321 are triangular, so that the fluid flow near the tail edge of the fan blade 32 can be improved, the vortex breaking effect is generated on vortex formed in the fluid movement process, and the pneumatic noise generated by the blades 32 is reduced; and the saw teeth 321 can play a role in rectifying when the fluid is swept, so that the flow loss is reduced, and the efficiency of the fan is improved; meanwhile, the weight of the blade 32 is also reduced, so that the working energy consumption of the blade is effectively reduced, and the technical effects of energy conservation and dryness reduction are achieved.

The test shows that the blade 32 with the saw teeth 321 is compared with the conventional blade without the saw teeth at a position 1 m away from the air outlet of the fan, and the test result is shown in fig. 6, and the characteristic curve shows that the blade 32 with the saw teeth can reduce the operation noise of the centrifugal fan by 5-7 db compared with the conventional blade.

In this embodiment, the driving mechanism includes a motor 51, a driving wheel 52 fixed to an output end of the motor 51, a driven wheel 53 fixed to one end of the main shaft 2, and a belt 54 connected between the driving wheel 52 and the driven wheel 53. The belt 54 is driven to operate stably with little noise.

In this embodiment, a first bearing seat 61 is fixed at the air inlet 11, a second bearing seat 62 is fixed at a position outside the casing 1 corresponding to the first bearing seat 61, and two ends of the main shaft 2 are respectively sleeved into the first bearing seat 61 and the second bearing seat 62. The provision of the bearing housing facilitates improved stability of the rotation of the spindle 2.

In this embodiment, the outer cover of the belt 54 is provided with a protective cover 63. The protective cover 63 covers the outside of the belt 54 to prevent accidental injury of workers.

In this embodiment, the saw teeth 321 are isosceles triangle. The tangential speed of the air outlet side of the blade 32 can be more stable due to the arrangement of the conical grooves, so that the amplitude of the lateral pressure pulsation of the air outlet side of the blade 32 is reduced, and the running noise of the centrifugal fan is reduced. For the best use of the utility model, the saw teeth 321 are in the shape of equilateral triangles.

In this embodiment, the depth of the saw teeth 321 gradually decreases along the direction from the air inlet 11 to the air outlet 12. The arrangement of the structure can reduce the amplitude of the lateral pressure pulsation at the air outlet of the blade 32 and reduce the operation noise of the centrifugal fan.

In this embodiment, rounded corners are provided at the top of the saw teeth 321. Correspondingly, the tooth slot formed between the two sawteeth 321 is also provided with a round angle, and the tangential speed of the air outlet side of the blade 32 can be more stable due to the arrangement of the structure, so that the running noise of the centrifugal fan is reduced.

The above embodiments are preferred embodiments of the present utility model, and besides, the present utility model may be implemented in other ways, and any obvious substitution is within the scope of the present utility model without departing from the concept of the present utility model.

Claims (8)

1. The utility model provides a centrifugal fan of high ventilation low noise, includes the casing, sets up in the air intake of casing one side, sets up in the air outlet at casing top, transversely inserts the main shaft of locating air intake central authorities, is fixed in the epaxial multi-wing wind wheel of main and is used for driving the rotatory actuating mechanism of main shaft, is located the front end fixed mounting of multi-wing wind wheel and has axial fan, its characterized in that on the main shaft: the multi-wing wind wheel comprises a mounting frame and a plurality of blades which are arranged on the outer edge of the mounting frame in an annular array, wherein the blades are arc-shaped, a plurality of saw teeth which are sequentially and continuously arranged are arranged on the outer edge of each blade, and the saw teeth are triangular.

2. A high ventilation low noise centrifugal fan according to claim 1, wherein: the driving mechanism comprises a motor, a driving wheel fixed at the output end of the motor, a driven wheel fixed at one end of the main shaft and a belt connected between the driving wheel and the driven wheel.

3. A high ventilation low noise centrifugal fan according to claim 1, wherein: the air inlet is fixedly provided with a first bearing seat, a second bearing seat is fixed at the outer part of the shell corresponding to the first bearing seat, and two ends of the main shaft are sleeved into the first bearing seat and the second bearing seat respectively.

4. A high ventilation low noise centrifugal fan according to claim 2, wherein: the outside cover of belt is equipped with the protection casing.

5. A high ventilation low noise centrifugal fan according to claim 1, wherein: the saw teeth are isosceles triangle in shape.

6. A high ventilation low noise centrifugal fan according to claim 1, wherein: the saw teeth are in the shape of equilateral triangles.

7. A high ventilation low noise centrifugal fan according to claim 1, wherein: the depth of the saw teeth gradually decreases along the direction from the air inlet to the air outlet.

8. A high ventilation low noise centrifugal fan according to claim 7, wherein: the tops of the saw teeth are provided with round corners.