CN211975524U

CN211975524U - Low-noise axial flow fan

Info

Publication number: CN211975524U
Application number: CN202020393086.XU
Authority: CN
Inventors: 彭卫国
Original assignee: Shanghai Yingda Blower Co ltd
Current assignee: Shanghai Yingda Blower Co ltd
Priority date: 2020-03-24
Filing date: 2020-03-24
Publication date: 2020-11-20
Anticipated expiration: 2030-03-24

Abstract

The utility model discloses a low-noise axial flow fan, which relates to the technical field of axial flow fans and comprises a shell and an impeller rotationally arranged in the shell, wherein the impeller is connected with a driving device for driving the impeller to rotate; inhale the sound and fall the device of making an uproar including installing the radome fairing in the outside of air intake, the airflow channel of radome fairing is linked together with the airflow channel of casing, and the outside and the inboard cladding of radome fairing have respectively and inhale the sound cotton outward and inhale the sound cotton internally, and the cotton whole of internal sound absorption is inlayed and is located on the inner wall of radome fairing. The sound absorption and noise reduction device is arranged at the air inlet of the axial flow fan, so that the aim of reducing noise generated in operation is fulfilled on the basis of not changing the driving structure of the axial flow fan.

Description

Low-noise axial flow fan

Technical Field

The utility model belongs to the technical field of axial-flow fan technique and specifically relates to a low noise axial-flow fan is related to.

Background

The axial flow fan mainly comprises a fan impeller and a casing, wherein the flow direction of airflow of the axial flow fan is parallel to the axial direction of the fan impeller, and the axial flow fan is usually suitable for occasions with higher flow requirements and lower pressure requirements.

The traditional Chinese patent with the publication number of CN209385377U is named as 'a high-efficiency low-noise axial flow fan', and comprises a main body, wherein an airflow channel penetrates through the main body along the length direction of the main body, at least one group of impellers located in the same cross section of the airflow channel are arranged in the airflow channel, each impeller comprises a rotating shaft arranged along the direction of the main body, the rotating shafts are parallel to each other and synchronously transmit, and the rotating shafts are connected with a driving mechanism for driving the rotating shafts to axially rotate. By utilizing the multiple groups of impellers, the diameter of the impellers is reduced on the premise of not reducing the total effective wind bearing area of the impellers, and the noise and energy loss caused by the vibration of the impeller blades are reduced, so that the axial flow fan has the advantages of high efficiency and low noise.

In the prior art, an impeller with a large diameter is divided into a plurality of groups of impellers with small diameters, and each impeller rotates to drive gas to flow. Each impeller rotates synchronously under the action of the same driving mechanism, namely, the driving motor drives the driving shaft to rotate, and the driving shaft rotates and drives each impeller with a small diameter to rotate in a gear meshing driving mode. The driving mechanism is changed from an original one-to-one mechanical driving structure into a one-to-many mechanical driving structure, the requirements on the stability and the safety of the transmission of the driving mechanism are high, and the prior art has the improvement.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art exists, the utility model aims to provide a low noise axial fan inhales the mode of making an uproar and falling the device of making an uproar through the installation in the air intake department of fan, reaches the purpose that reduces produced noise in the operation on the basis that does not change the drive structure of fan itself.

The above utility model discloses an above-mentioned utility model purpose can realize through following technical scheme: a low-noise axial flow fan comprises a shell and an impeller rotatably arranged in the shell, wherein the impeller is connected with a driving device for driving the impeller to rotate; inhale the sound and fall the device of making an uproar including installing in the radome fairing in the outside of air intake, the airflow channel of radome fairing is linked together with the airflow channel of casing, the outside and the inboard cladding of radome fairing have respectively to inhale the sound cotton outward and inhale the sound cotton in with, just inhale the sound cotton whole set in locate on the inner wall of radome fairing.

Through adopting above-mentioned technical scheme, inhale the sound cotton outward and inhale the sound cotton effect that all plays the noise that absorbs axial fan air intake department production in with on radome fairing outer wall and the inner wall, and the cotton first noise absorption of interior sound after, but the cotton secondary noise absorption of sound of inhaling outward is favorable to further improving and inhales the sound noise reduction effect. The internal sound-absorbing cotton is integrally embedded in the inner wall of the fairing, so that the normal flow of air flow can not be influenced, and meanwhile, extra air flow disturbance noise can not be generated. The sound absorption and noise reduction device is arranged at the air inlet of the axial flow fan, so that the aim of reducing noise generated in operation is fulfilled on the basis of not changing the driving structure of the axial flow fan.

The present invention may be further configured in a preferred embodiment as: the casing is connected with the radome fairing and constitutes integrative structure, and is located on the outer wall of integrative structure the junction cladding of casing and radome fairing has the middle cotton of inhaling the sound.

Through adopting above-mentioned technical scheme, but the middle sound cotton of inhaling can the produced noise of the vibration of effective absorption casing and radome fairing intermediate junction, also can play the supplementary effect of inhaling the noise of making an uproar device absorption air intake department of falling of inhaling.

The present invention may be further configured in a preferred embodiment as: the outer wall of the integrated structure is provided with a hoop structure at the joint of the shell and the fairing, and the hoop structure surrounds and compresses the middle sound-absorbing cotton on the outer wall of the integrated structure.

Through adopting above-mentioned technical scheme, staple bolt structure had both played the cotton effect of sound is inhaled in the middle of further fixing, played the effect of further fixed casing and radome fairing again.

The present invention may be further configured in a preferred embodiment as: the outer wall of the shell is coated with shell body sound-absorbing cotton.

By adopting the technical scheme, the shell body sound-absorbing cotton can play a role in assisting the sound-absorbing and noise-reducing device to absorb noise generated by vibration of the shell body.

The present invention may be further configured in a preferred embodiment as: the fairing comprises an airflow inlet and an airflow outlet, the airflow outlet is communicated with the air inlet of the shell, and the airflow inlet is of an outward expansion type opening structure.

Through adopting above-mentioned technical scheme, the air current import that adopts external expanding formula open structure replaces the air current import of ordinary straight tube structure, is favorable to reducing the vibration noise that the air current arouses when acting on air current import and produces.

The present invention may be further configured in a preferred embodiment as: the air inlet of the shell extends to form a connecting bulge, the airflow outlet of the fairing is provided with a connecting groove, the connecting bulge is in inserting fit with the connecting groove, and the connecting bulge and the connecting groove are connected with a locking piece.

Through adopting above-mentioned technical scheme, adopt the mode locking connection casing and the radome fairing of connecting protrusion, connection groove cooperation locking piece, simple structure, easy to carry out has better operation convenience.

The present invention may be further configured in a preferred embodiment as: the connecting protrusion is formed by extending the annular end face of the air inlet towards the direction far away from the shell, and the connecting groove is formed in the annular end face of the air outlet towards one side of the shell.

By adopting the technical scheme, the casing and the fairing are fixedly connected by adopting the annular end face plug-in type structure, the problem that the normal flow of air flow is influenced by the connection protrusion and the connection groove in the air flow channel can be solved, and meanwhile, the normal connection of the casing and the fairing is not influenced.

The present invention may be further configured in a preferred embodiment as: the novel fan blade is characterized in that a mesh enclosure is arranged in the shell, the mesh enclosure is located on one side, close to the air inlet, of the impeller, the mesh enclosure comprises a central plate located at the central position and a connecting arm extending to the edge of the air inlet and fixed through the central plate, and a hollow structure is formed in the central plate.

Through adopting above-mentioned technical scheme, the screen panel plays the effect that the separation debris got into in the airflow channel of casing, simultaneously, sets up in the well core plate department of screen panel and forms hollow out construction to reach on the basis that does not influence the separation effect, reduce the purpose that the air current noise that flows produced.

The present invention may be further configured in a preferred embodiment as: the shell is provided with a movable base or a fixed base in a matching way.

Through adopting above-mentioned technical scheme, low noise axial fan has multiple model, is applicable to different operation demands.

The present invention may be further configured in a preferred embodiment as: the shell is detachably connected with the movable base or the fixed base.

Through adopting above-mentioned technical scheme, the user can select suitable base structure according to actual demand to the different user demand of adaptation has better use flexibility and practicality.

To sum up, the utility model discloses a following at least one useful technological effect:

1. the sound absorption and noise reduction device consisting of the fairing, the inner sound absorption cotton and the outer sound absorption cotton is arranged at the air inlet of the axial flow fan, so that the aim of reducing the noise generated in the operation process is fulfilled on the basis of not changing the driving structure of the axial flow fan;

2. the middle sound-absorbing cotton and the shell body sound-absorbing cotton are additionally arranged on the basis of the sound-absorbing and noise-reducing device, so that the aim of further reducing noise by the aid of the inner sound-absorbing cotton and the outer sound-absorbing cotton is fulfilled;

3. the shell and the fairing adopt an annular end face plug-in type locking installation structure, and meanwhile, a central plate with a hollow structure and an airflow inlet with an outward-expanding opening structure are adopted, so that the noise is further reduced from two aspects of the structure and the connection structure.

Drawings

FIG. 1 is a schematic view of the overall structure of a low noise axial flow fan;

FIG. 2 is a schematic longitudinal sectional view of a low noise axial flow fan;

FIG. 3 is a schematic view of the overall structure of the sound absorbing and noise reducing device;

FIG. 4 is an enlarged schematic view of section A of FIG. 2;

FIG. 5 is a schematic view of the movable base and the housing;

fig. 6 is a schematic view mainly showing the fitting structure of the fixed base and the housing.

In the figure, 1, a housing; 11. an air inlet; 12. an air outlet; 13. a connecting projection; 2. an impeller; 3. a drive device; 4. a sound absorbing and noise reducing device; 41. a cowling; 411. an airflow inlet; 412. an airflow outlet; 42. an outwardly expanding opening structure; 43. external sound absorption cotton; 44. inner sound-absorbing cotton; 45. a connecting groove; 5. the shell body is made of sound-absorbing cotton; 6. a locking member; 7. a unitary structure; 71. sound absorption cotton in the middle; 72. a hoop structure; 8. a mesh enclosure; 81. a center plate; 811. a hollow structure; 82. a connecting arm; 91. a movable base; 92. a fixed base.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1 and 2, a low-noise axial-flow fan includes a housing 1, an impeller 2 and a driving device 3 for driving the impeller 2 to rotate are rotatably mounted in the housing 1, an air inlet 11 and an air outlet 12 are formed in the housing 1, the air inlet 11 is located on a front side of the housing 1, and the air outlet 12 is located on a rear side of the housing 1. The driving device 3 drives the impeller 2 to rotate, the impeller 2 rotates to suck airflow into the shell 1 from the air inlet 11 on the front side, and then the airflow is discharged from the air outlet 12 on the rear side of the shell 1 and enters an external pipeline, so that the aim of ventilation is fulfilled.

The motor can be used as the driving device 3, the motor can directly drive the impeller 2 to rotate, and the impeller 2 can be indirectly driven to rotate through the transmission mechanism arranged in the shell 1, and the transmission mechanism can adopt a gear-meshing type driving structure.

In the operation process of the axial flow fan, airflow impact noise, which is referred to as airflow noise for short, is generated at the air inlet 11 of the casing 1 due to airflow impact, and vibration noise is generated at the casing 1 which is subjected to the airflow impact or the vibration of the driving device 3 and the transmission mechanism, so that the overall noise generated during the operation of the axial flow fan is large, and therefore the silencing and noise reduction treatment needs to be performed on the casing 1 and the air inlet 11 of the casing 1.

Referring to fig. 1 and 3, the sound absorbing and noise reducing device 4 is installed at the air inlet 11 of the housing 1, the sound absorbing and noise reducing device 4 includes a fairing 41 locked and installed at the outer side of the air inlet 11, the fairing 41 is a cylindrical structure, and an airflow channel of the fairing 41 is communicated with an airflow channel of the housing 1. The airflow channel of the fairing 41 includes an airflow inlet 411 and an airflow outlet 412, the airflow outlet 412 is communicated with the air inlet 11 of the housing 1, and the opening of the airflow inlet 411 adopts an outward-expanding opening structure 42 to play a role in restricting the airflow, thereby achieving the purpose of reducing the airflow impact noise and the airflow diffusion noise. The cladding has outer sound cotton 43 and the cotton 44 of interior sound of inhaling respectively to the lateral surface of radome fairing 41 and medial surface bonds respectively, and the cotton 44 of interior sound of inhaling is whole to be inlayed and is established the bonding and be fixed in on the inside wall of radome fairing 41 to avoid the cotton 44 influence of convex interior sound of inhaling the air current in radome fairing 41 to normally flow, meanwhile, it has the hull to inhale cotton 5 of sound still to bond the cladding on casing 1's the outer wall, in order to reach the purpose of absorbing casing 1 vibration noise, drive mechanism running noise and air current impulsive noise.

As shown in fig. 2 and 4, the annular end surface of the air inlet 11 of the housing 1 extends along the circumferential direction thereof to form a connecting protrusion 13, the connecting protrusion 13 extends towards the direction away from the housing 1, the annular end surface of the airflow outlet 412 of the cowling 41 is opened along the circumferential direction thereof to form a connecting groove 45, and the connecting groove 45 extends towards the inner side of the cowling 41. Casing 1 and fairing 41 accessible link joint 13 and coupling groove 45's grafting cooperation realize being connected to wear to establish link joint 13 and coupling groove 45 after the grafting cooperation through locking piece 6 and realize the locking, can adopt the screw to use as locking piece 6, and the head of screw need inlay in locating fairing 41's inside wall, in order to avoid influencing the normal flow of air current in fairing 41 and the casing 1.

Referring to fig. 1 and 3, the casing 1 and the cowling 41 are connected through the air inlet 11 and the air outlet 412 to form an integral structure 7, the joint of the casing 1 and the cowling 41 on the integral structure 7 is wrapped with the middle sound-absorbing cotton 71, and the middle sound-absorbing cotton 71 is externally clamped and installed with the hoop structure 72, that is, the hoop structure 72 is locked around the joint of the casing 1 and the cowling 41 on the integral structure 7, and the middle sound-absorbing cotton 71 is pressed around the outer wall of the integral structure 7, so that the function of further fixing the middle sound-absorbing cotton 71 is achieved, and the function of further fixing the casing 1 and the cowling 41 is also achieved.

As shown in fig. 3, a mesh enclosure 8 is welded at the air inlet 11 of the housing 1, and the mesh enclosure 8 is located between the air inlet 11 and the impeller 2 and close to one side of the air inlet 11, so as to prevent the impurities from being entangled with the impeller 2. The mesh enclosure 8 includes a central plate 81 located at a central position, a plurality of connecting arms 82 are formed by uniformly extending the circumferential side of the central plate 81, the connecting arms 82 extend to the inner side of the air inlet 11 and are welded and fixed, a hollow structure 811 is formed on the central plate 81, and the hollow structure 811 reduces the wind resistance area of the central plate 81, so that the control of the air flow noise is facilitated.

Referring to fig. 5 and 6, the housing 1 is provided with a movable base 91 or a fixed base 92, the movable base 91 and the fixed base 92 are detachably connected to the housing 1 by bolts, and a user can select to install the movable base 91 or the fixed base 92 according to actual needs.

The utility model is further explained by combining the specific actions as follows:

the sound absorption and noise reduction device 4 is installed at an air inlet 11 of the axial flow fan, the sound absorption and noise reduction device 4 is composed of a fairing 41, outer sound absorption cotton 43 and inner sound absorption cotton 44, the purpose of weakening airflow noise and vibration noise in the aspects of restricting airflow and weakening noise is achieved, meanwhile, the shell body sound absorption cotton 5 is additionally arranged on the basis, and a hollow structure 811 is arranged, so that the purpose of further weakening noise is achieved.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims

1. The utility model provides a low noise axial-flow fan, installs impeller (2) in casing (1) including casing (1) and rotation, impeller (2) are connected with its pivoted drive arrangement (3) of drive, its characterized in that: the shell (1) comprises an air inlet (11) and an air outlet (12), and the air inlet (11) is provided with a sound absorption and noise reduction device (4); inhale sound and fall device (4) including installing in radome fairing (41) in the outside of air intake (11), the airflow channel of radome fairing (41) is linked together with the airflow channel of casing (1), the outside and the inboard cladding of radome fairing (41) have respectively and inhale sound cotton (43) and interior sound absorption cotton (44) outward, just interior sound absorption cotton (44) are whole to be inlayed on the inner wall of radome fairing (41).

2. A low-noise axial-flow fan according to claim 1, wherein: casing (1) and radome fairing (41) are connected and are constituted integrative structure (7), and lie in on the outer wall of integrative structure (7) the junction cladding of casing (1) and radome fairing (41) has middle sound cotton (71) of inhaling.

3. A low-noise axial-flow fan according to claim 2, wherein: the outer wall of the integrated structure (7) is provided with a hoop structure (72) at the joint of the shell (1) and the fairing (41), and the hoop structure (72) surrounds and compresses the middle sound absorbing cotton (71) on the outer wall of the integrated structure (7).

4. A low-noise axial-flow fan according to claim 1 or 3, wherein: the outer wall of the shell (1) is coated with shell body sound-absorbing cotton (5).

5. A low-noise axial-flow fan according to claim 1, wherein: the fairing (41) comprises an airflow inlet (411) and an airflow outlet (412), the airflow outlet (412) is communicated with the air inlet (11) of the shell (1), and the airflow inlet (411) is arranged to be an outward-expanding opening structure (42).

6. A low-noise axial-flow fan according to claim 5, wherein: the air inlet (11) of casing (1) department extends and is formed with coupling protrusion (13), air outlet (412) department of radome fairing (41) is seted up and is formed with coupling groove (45), coupling protrusion (13) and coupling groove (45) cooperation of pegging graft, just coupling protrusion (13) and coupling groove (45) are connected with locking piece (6).

7. A low-noise axial-flow fan according to claim 6, wherein: the connecting protrusion (13) is formed by extending the annular end face of the air inlet (11) towards the direction far away from the shell (1), and the connecting groove (45) is arranged on the annular end face of the air outlet (412) towards one side of the shell (1).

8. A low-noise axial-flow fan according to claim 1, wherein: be provided with screen panel (8) in casing (1), screen panel (8) are located one side that impeller (2) are close to air intake (11), screen panel (8) are including being located central plate (81) of central point department of putting and extending to air intake (11) edge and fixed linking arm (82) by central plate (81), just set up on central plate (81) and be formed with hollow out construction (811).

9. A low-noise axial-flow fan according to claim 1, wherein: the shell (1) is provided with a movable base (91) or a fixed base (92) in a matching way.

10. A low-noise axial-flow fan according to claim 9, wherein: the shell (1) is detachably connected with the movable base (91) or the fixed base (92).