CN216589185U - Low-noise centrifugal fan - Google Patents

Abstract

The utility model discloses a low-noise centrifugal fan in the technical field of centrifugal fans, which comprises a centrifugal fan body, an air inlet pipe and an air outlet pipe, wherein the air inlet pipe is communicated with the front side surface of the centrifugal fan body, the air outlet pipe is communicated with the right side surface of the centrifugal fan body, a sound insulation shell is sleeved outside the centrifugal fan body, a sound absorption cotton sleeve is sleeved outside the air inlet pipe, a plurality of air inlet holes are formed in the side surface of the sound absorption cotton sleeve, positioning rods are slidably arranged on the left side and the right side of the sound absorption cotton sleeve in a penetrating manner, one ends of the positioning rods extend into the air inlet pipe in a penetrating manner, an operating plate is arranged at the other ends of the positioning rods, and an annular sound absorption layer is arranged on the inner wall surface of the air inlet pipe; according to the utility model, the sound absorption cotton sleeve and the annular sound absorption layer are arranged, the sound of airflow flowing is absorbed when the airflow passes through the air holes by utilizing the effect of matching the sound absorption cotton sleeve with the air holes, and the airflow is guided by utilizing the effects of the annular sound absorption sleeve and the air deflector, so that the area of the inner wall of the air inlet pipe rubbed by the airflow is reduced, and the workers can communicate normally.

Description

A low noise centrifugal fan

technical field

The utility model relates to the technical field of centrifugal fans, in particular to a low-noise centrifugal fan.

Background technique

Centrifugal fan is a kind of support equipment that utilizes the input mechanical energy to increase gas pressure and discharge gas. With the continuous development of factories, mines, tunnels, etc., centrifugal fans need to be used for ventilation, dust removal and cooling. With the continuous development, people have higher and higher requirements for the manufacturing process of centrifugal fans.

At present, during the use of the centrifugal fan, the flow of air flow and the friction between the air flow and the inner wall of the centrifugal fan produce loud noise, which not only causes noise pollution caused by the use of the centrifugal fan, but also affects the normal communication between the staff.

Utility model content

The purpose of this utility model is to provide a low-noise centrifugal fan, so as to solve the problem that during the use of the current centrifugal fan proposed in the above-mentioned background technology, the flow of the air flow and the friction between the air flow and the inner wall of the centrifugal fan produce loud sounds, which not only cause The use of centrifugal fans causes noise pollution and also affects the normal communication between workers.

In order to achieve the above purpose, the present invention provides the following technical solutions: a low-noise centrifugal fan, comprising a centrifugal fan body, an air inlet pipe connected to the front side of the centrifugal fan body and an air outlet pipe on the right side, the centrifugal fan body The outer casing is connected with a sound insulation shell, the outer casing of the air inlet pipe is connected with a sound-absorbing cotton cover, the side of the sound-absorbing cotton cover is provided with a number of air inlet holes, and the left and right sides of the sound-absorbing cotton cover are slidably installed with positioning rods, the positioning rod One end of the rod penetrates and extends into the air inlet pipe, the other end of the positioning rod is installed with an operation panel, the inner wall surface of the air inlet pipe is installed with an annular sound absorbing layer, and the inner wall surface of the annular sound absorbing layer is installed with an air guide plate.

Preferably, inclined plates are hinged on the front and rear sides of the inner wall of the air outlet pipe, and sound-absorbing plates are installed on the opposite sides of the two inclined plates.

Preferably, springs are installed on both front and rear sides of the inner wall of the air outlet pipe, and the other ends of the springs are fixedly connected to the inclined plate.

Preferably, the spring is provided with a telescopic rod hingedly mounted on one side of the inner wall of the air outlet pipe, and the telescopic shaft end of the telescopic rod is hingedly connected to the inclined plate.

Preferably, a bottom plate is provided below the centrifugal fan body, a sponge pad is installed on the upper surface of the bottom plate, and the centrifugal fan body is located on the sponge pad.

Preferably, L-shaped plates are installed on the front and rear sides of the bottom plate, the vertical part of the L-shaped plate is threadedly connected with a bolt, and one end of the bolt passes through the vertical part of the L-shaped plate and is threadedly connected to the sound insulation shell .

Compared with the prior art, the beneficial effects of the present utility model are: the utility model provides the sound-absorbing cotton cover and the annular sound-absorbing layer, and utilizes the sound-absorbing cotton cover to cooperate with the ventilation holes, so that the sound of the air flow is absorbed when the airflow passes through the ventilation holes. , and then use the function of the annular sound-absorbing sleeve and the wind deflector to guide the airflow and reduce the area of the airflow friction on the inner wall of the air inlet pipe, so that the staff can communicate normally.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the accompanying drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

Fig. 1 is the structural representation of the utility model;

Fig. 2 is the top view sectional structure schematic diagram of the low-noise centrifugal fan of the present invention;

FIG. 3 is a schematic diagram of the enlarged structure of the low-noise centrifugal fan in FIG. 2 of the present invention.

In the accompanying drawings, the list of components represented by each number is as follows:

1. Centrifugal fan body; 2. Air inlet duct; 3. Air outlet duct; 4. Air deflector; 5. Sound-absorbing cotton cover; 6. Positioning rod; 7. Operation panel; 8. Bottom plate; 9. Sponge pad; 10. L-shaped plate; 11, bolt; 12, sound insulation shell; 13, inclined plate; 14, sound-absorbing plate; 15, telescopic rod; 16, spring;

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to 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 implementations. example. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

1-3, the present utility model provides a technical solution: a low-noise centrifugal fan, comprising a centrifugal fan body 1, an air inlet duct 2 connected to the front side of the centrifugal fan body 1, and an air outlet duct on the right side 3. The outer cover of the centrifugal fan body 1 is connected with a sound insulation shell 12, and the outer cover of the air inlet duct 2 is connected with a sound-absorbing cotton cover 5. The sound-absorbing cotton cover 5 is used to cooperate with the ventilation holes to absorb the sound of the airflow when the airflow passes through the ventilation holes. The side of the cotton cover 5 is provided with a number of air intake holes 17, and the left and right sides of the sound-absorbing cotton cover 5 are slidably installed with a positioning rod 6, one end of the positioning rod 6 extends through the air inlet duct 2, and the other end of the positioning rod 6 is installed There is an operation panel 7, an annular sound-absorbing layer 18 is installed on the inner wall surface of the air inlet duct 2, and an air guide plate 4 is installed on the inner wall surface of the annular sound-absorbing layer 18. The effect of the annular sound-absorbing sleeve and the air guide plate 4 is used to guide the airflow, Reduce the area where the airflow rubs the inner wall of the air inlet duct 2 .

Among them, inclined plates 13 are hinged on both the front and rear sides of the inner wall of the air outlet duct 3, and sound-absorbing plates 14 are installed on the opposite sides of the two inclined plates 13. By setting the inclined plates 13 and the sound-absorbing plates 14, the inclined plates 13 are used to face the The air flow of the air duct 3 is buffered, thereby reducing the sound of the air flow when the air is discharged, and cooperates with the function of the sound absorbing panel 14 to absorb the sound when the air is exhausted, thereby achieving the effect of noise reduction.

Among them, springs 16 are installed on the front and rear sides of the inner wall of the air outlet duct 3, and the other end of the springs 16 is fixedly connected with the inclined plate 13. By setting the spring 16, the elasticity of the spring 16 is used to reset the moved inclined plate 13, Furthermore, it is convenient to seal the air outlet duct 3 to prevent excessive dust accumulation in the air outlet duct 3 that has been working for a long time, and the structure is simple.

The spring 16 is provided with a telescopic rod 15 hingedly mounted on one side of the inner wall of the air outlet 3 , and the telescopic shaft end of the telescopic rod 15 is hingedly connected to the inclined plate 13 . By setting the telescopic rod 15 , the extensibility of the telescopic rod 15 is utilized The rope-pulling process of the spring 16 is supported, thereby increasing the stability of the spring 16 when it is stretched, and increasing the service life of the spring 16 , so that the spring 16 can stably reset and support the inclined plate 13 .

Wherein, a bottom plate 8 is arranged below the centrifugal fan body 1, a sponge pad 9 is installed on the upper surface of the bottom plate 8, and the centrifugal fan body 1 is located on the sponge pad 9. The fixing between the fan body 1 and the ground is buffered, and the vibration force generated when the centrifugal fan body 1 is working is buffered by the sponge pad 9, thereby further increasing the noise reduction effect.

Wherein, L-shaped plates 10 are installed on the front and rear sides of the bottom plate 8 , the vertical part of the L-shaped plate 10 is threadedly connected with bolts 11 , and one end of the bolts 11 passes through the vertical part of the L-shaped plate 10 and is threadedly connected to the sound insulation shell 12 By setting the bolts 11, the bottom plate 8 is fixed by the screw connection of the bolts 11 and the sound insulation shell 12, and it is also convenient for the staff to disassemble the bottom plate 8 in the later stage, and then perform maintenance work on the bottom of the centrifugal fan.

Start the centrifugal fan body 1, the centrifugal fan body 1 absorbs the gas through the air inlet duct 2, and the gas enters the air inlet duct 2 through the ventilation holes, uses the sound-absorbing cotton sleeve 5 to absorb the sound of the airflow, and then uses the annular sound-absorbing layer 18 to absorb the sound. Secondary absorption, through the action of the air deflector 4, and then the centrifugal fan body 1, and then discharged through the air outlet duct 3, when the air flow is discharged from the air outlet duct 3, the air flow pushes the two inclined plates 13 outward, and the two The distance between the inclined plates 13 gradually increases, the inclined plates 13 squeeze the telescopic rod 15 and the spring 16, and the sound-absorbing plate 14 is used to absorb the sound of the outgoing airflow, thereby playing a role of noise reduction.

In the description of this specification, description with reference to the terms "one embodiment", "example", "specific example", etc. means that a specific feature, structure, material or characteristic described in connection with the embodiment or example is included in the present invention. in at least one embodiment or example. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details, nor do they limit the invention to only the described embodiments. Obviously, many modifications and variations are possible in light of the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principle and practical application of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims (6)

1. A low-noise centrifugal fan, characterized in that: comprising a centrifugal fan body (1) and an air inlet pipe (2) connected to the front side of the centrifugal fan body (1) and an air outlet pipe (3) on the right side, The centrifugal fan body (1) is covered with a sound insulation shell (12), the air inlet pipe (2) is covered with a sound-absorbing cotton cover (5), and a number of air inlet holes are opened on the side of the sound-absorbing cotton cover (5). (17), the left and right sides of the sound-absorbing cotton cover (5) are slidably installed with a positioning rod (6), one end of the positioning rod (6) extends through the air inlet pipe (2), the positioning rod An operation panel (7) is installed on the other end of (6), an annular sound absorbing layer (18) is installed on the inner wall surface of the air inlet pipe (2), and an air guide plate is installed on the inner wall surface of the annular sound absorbing layer (18). (4). 2. A low-noise centrifugal fan according to claim 1, characterized in that: inclined plates (13) are hinged on both the front and rear sides of the inner wall of the air outlet pipe (3), and two inclined plates (13) are hinged on both sides. ) are installed with sound-absorbing panels (14) on the opposite side. 3. A low-noise centrifugal fan according to claim 1, wherein a spring (16) is installed on both the front and rear sides of the inner wall of the air outlet pipe (3), and the other end of the spring (16) Both are fixedly connected with the inclined plate (13). 4. A low-noise centrifugal fan according to claim 3, characterized in that: the spring (16) is provided with a telescopic rod (15) hingedly mounted on one side of the inner wall of the air outlet pipe (3), the The telescopic shaft end of the telescopic rod (15) is hingedly connected with the inclined plate (13). 5. A low-noise centrifugal fan according to claim 1, characterized in that: a bottom plate (8) is provided below the centrifugal fan body (1), and a sponge pad is installed on the upper surface of the bottom plate (8). (9), the centrifugal fan body (1) is located on the sponge pad (9). 6. A low-noise centrifugal fan according to claim 5, characterized in that: L-shaped plates (10) are installed on both front and rear sides of the bottom plate (8), and the vertical direction of the L-shaped plate (10) The straight part is threadedly connected with a bolt (11), and one end of the bolt (11) passes through the vertical part of the L-shaped plate (10) and is threadedly connected to the sound insulation shell (12).

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