CN110081020B

CN110081020B - Fan volute tongue

Info

Publication number: CN110081020B
Application number: CN201810073511.4A
Authority: CN
Inventors: 袁柯铭; 唐兴旺
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2018-01-25
Filing date: 2018-01-25
Publication date: 2024-02-20
Anticipated expiration: 2038-01-25
Also published as: CN110081020A

Abstract

The invention discloses a fan volute tongue, which comprises a volute tongue body and is characterized in that: the tongue tip of the volute tongue body is provided with a mounting groove, the mounting groove is distributed along the length direction of the volute tongue body, a rotating column is arranged in the mounting groove, two ends of the rotating column are respectively arranged on the front wall and the rear wall of the mounting groove, and a driving piece for driving the rotating column to rotate is arranged on the front wall or the rear wall of the mounting groove. The invention has the advantages that: the fan volute tongue is provided with the rotating column which can rotate relative to the volute tongue body at the tongue tip of the volute tongue body, so that the Magnus effect can be utilized to enable the tongue tip of the volute tongue to generate gas circulation, partial airflow which collides with the tongue tip of the volute tongue is deflected towards the air outlet, the return gas is reduced, and the air quantity and the air pressure are improved. In addition, through setting up the pit on the column surface, can further strengthen the gas circulation, and then can further promote amount of wind and wind pressure.

Description

Fan volute tongue

Technical Field

The invention relates to a fan volute tongue.

Background

The multi-wing centrifugal fan is widely applied to the range hood due to the advantages of compact structure, high pressure coefficient, large flow coefficient, low noise and the like. A centrifugal fan of the existing range hood is provided with a volute tongue near the outlet of the volute, and the volute tongue has the function of preventing part of gas from circularly flowing in the volute. Experiments show that the impact of the air flow at the outlet of the impeller on the volute tongue is strong, the air flow near the volute tongue is complex, and the influence on the performance of the fan is large. In addition, the object rotates in the air to drive the surrounding fluid to rotate, and the circulation generated by rotation interacts with the fluid to increase the fluid speed on one side of the object and reduce the fluid speed on the other side, which is called the magnus effect. At present, improvement of a fan volute tongue structure is mainly considered from the aspects of reducing fan noise and eliminating vortex angles, such as a smoke exhaust ventilator and a volute casing and a volute tongue thereof disclosed in Chinese patent application with the application number of 201210890. X (application publication number of 103512064A), wherein the volute tongue comprises an inner concave surface which is a smooth curved surface, so that air flow at the volute tongue is smoother, noise reduction is facilitated, although the improved volute tongue is beneficial to noise reduction due to partial reduction of air flow in the middle of the volute tongue, the upper connecting surface of the volute tongue is a plane, front and rear air flows at two sides of the volute tongue normally exit, and the middle air flow and the front and rear air flows impact the connecting surface almost at the same moment to cause noise superposition increase, and the volute tongue is not considered from the aspect of enhancing air circulation, so that the air quantity and air pressure of the fan cannot be effectively improved. In view of the above, there is a need for further improvements in the prior art fan volute tongue structure.

Disclosure of Invention

The first technical problem to be solved by the invention is to provide a fan volute tongue capable of reducing backflow and effectively improving the air quantity and the air pressure of a fan aiming at the current state of the art.

The second technical problem to be solved by the invention is to provide a fan volute tongue capable of further enhancing air circulation and improving air quantity and air pressure aiming at the current state of the art.

The technical scheme adopted by the invention for solving the first technical problem is as follows: the fan volute tongue comprises a volute tongue body and is characterized in that: the tongue tip of the volute tongue body is provided with a mounting groove, the mounting groove is distributed along the length direction of the volute tongue body, a rotating column is arranged in the mounting groove, two ends of the rotating column are respectively arranged on the front wall and the rear wall of the mounting groove, and a driving piece for driving the rotating column to rotate is arranged on the front wall or the rear wall of the mounting groove.

Preferably, the two ends of the rotating column are provided with mounting shafts extending outwards, wherein the mounting shaft at one end is mounted on the front wall of the mounting groove, the mounting shaft at the other end is mounted on the rear wall of the mounting groove, the driving piece adopts a motor, and an output shaft of the motor penetrates through the front wall or the rear wall of the mounting groove and is connected with the corresponding mounting shaft.

Further preferably, the cross section of the rotating column is circular, and correspondingly, the mounting groove is provided with an arc-shaped concave surface matched with the rotating column.

Further preferably, the upper wall surface of the volute tongue body is a guide wall, the lower wall surface of the volute tongue body is a backflow wall, the rotating column is connected between the guide wall and the backflow wall, and the surface of the rotating column is in smooth transition with the surfaces of the guide wall and the backflow wall.

The second technical problem is solved by adopting the technical scheme that the fan volute tongue is provided with pits on the surface of the rotating column. After the pits are formed, the friction force between the rotary column and the air can be increased, the air circulation is further enhanced, the air deflection is more obvious, and the air quantity and the air pressure can be further improved.

More preferably, the pit is a round pit, and the depth of the pit is 0.2 mm-0.5 mm.

The pits can be distributed in various ways, and as a preferable scheme, the pits are arranged in the middle section area of the rotary column, and the density of the pits is maximum near the center line of the rotary column and gradually becomes smaller towards the front end and the rear end.

In order to increase the fluid velocity at the front and back sides of the volute tongue, the pits are arranged in the front and back sections of the rotating column.

Further preferably, the pits are distributed over the entire surface of the spin column, and the density of the pits is greatest near the center line of the spin column and gradually becomes smaller toward the front and rear ends.

As another preferable scheme, the diameter of the rotary column is gradually changed, and the diameter of the rotary column is gradually reduced from the middle to the front end and the rear end. Thus, the air flow deflects towards the front and back sides, so that the air flow of the air outlet is more uniform.

As another preferable scheme, the diameter of the rotary column is gradually changed, and the diameter of the rotary column is gradually increased from the middle to the front end and the rear end. In this way, the front and rear air flows are deflected toward the middle.

Compared with the prior art, the invention has the advantages that: the fan volute tongue is provided with the rotating column which can rotate relative to the volute tongue body at the tongue tip of the volute tongue body, so that the Magnus effect can be utilized to enable the tongue tip of the volute tongue to generate gas circulation, partial airflow which collides with the tongue tip of the volute tongue is deflected towards the air outlet, the return gas is reduced, and the air quantity and the air pressure are improved. In addition, through set up the pit at the column spinner surface, can increase the frictional force of column spinner and air, further strengthen the gas circulation, make the gas deflection more obvious, and then can further promote amount of wind and wind pressure.

Drawings

FIG. 1 is a schematic diagram of a first embodiment of the present invention;

FIG. 2 is an exploded view of a first embodiment of the present invention;

FIG. 3 is a schematic view of a fan with a volute tongue according to one embodiment of the invention;

FIG. 4 is a cross-sectional view of the blower of FIG. 3;

FIG. 5 is a schematic airflow diagram of the tip of the tongue of the first embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a second embodiment of the present invention;

FIG. 7 is a cross-sectional view of a middle section of a spin column according to a second embodiment of the present invention;

FIG. 8 is a schematic diagram of a third embodiment of the present invention;

FIG. 9 is a schematic diagram of a fourth embodiment of the present invention;

FIG. 10 is a schematic diagram of a fifth embodiment of the present invention;

FIG. 11 is a schematic diagram of a sixth embodiment of the present invention;

fig. 12 is a schematic structural diagram of a seventh embodiment of the present invention.

Detailed Description

The invention is described in further detail below with reference to the embodiments of the drawings.

Embodiment one:

as shown in fig. 1 to 2, the fan volute tongue in this embodiment includes a volute tongue body 1 with a tongue tip of the volute tongue body 1 being provided with a mounting groove 11, the mounting groove 11 being distributed along a length direction of the volute tongue body 1, a rotating column 2 being mounted in the mounting groove 11, both ends of the rotating column 2 being provided with mounting shafts 21 extending outward, wherein the mounting shaft 21 at one end is mounted on a front wall 12 of the mounting groove 11, the mounting shaft 21 at the other end is mounted on a rear wall 13 of the mounting groove 11, a motor 3 is mounted on the front wall 12 of the mounting groove 11, and an output shaft of the motor 3 passes through the front wall 12 of the mounting groove 11 and is connected with the corresponding mounting shaft 21 through a bearing 4, whereby the rotating column 2 can be driven to rotate correspondingly when the motor 3 rotates. In addition, the cross section of the rotating column 2 is circular, and correspondingly, the mounting groove 11 is provided with an arc-shaped concave surface matched with the rotating column 2, so that the rotating column 2 can smoothly rotate.

As shown in fig. 3 to 5, the fan volute tongue is mounted on the fan volute 5, the motor 3 is exposed out of the front wall of the fan volute 5, the upper wall surface of the volute tongue body 1 is a guide wall 14, the lower wall surface of the volute tongue body 1 is a return wall 15, the rotating column 2 is connected between the guide wall 14 and the return wall 15, and the surface of the rotating column 2 is in smooth transition with the surfaces of the guide wall 14 and the return wall 15. When the motor 3 rotates, the rotating direction of the rotating column 2 is shown by an arrow a, a magnus effect is utilized to generate air circulation at the tip of the volute tongue, namely, a circulation layer 7 (also called an auxiliary surface layer) is formed on the surface of the rotating column 2, the air flow direction of the circulation layer 7 is also shown by the arrow a, and the air flow direction of the impeller 6 is divided into two paths, one path flows to the guide wall 14 and the other path flows to the backflow wall 15 as shown by an arrow b, and the other path flows to the backflow wall 15 as shown by an arrow c, so that part of air flow colliding with the tip of the volute tongue deflects towards an air outlet due to the existence of the circulation layer 7, backflow air is reduced, namely, the air flow flowing to the backflow wall 15 is reduced, and the air flow flowing to the guide wall 14 is increased, and the air quantity and the air pressure of the fan are further improved.

Embodiment two:

as shown in fig. 6 and 7, the surface of the intermediate section area of the spin column 2 is covered with pits 22. The depth of the pit 22 is 0.2mm to 0.5mm. Further, the density of the pits 22 is greatest near the center line of the spin column 2, and gradually becomes smaller toward the front and rear ends. After the pit 22 is arranged on the rotary column 2, the friction force between the rotary column 2 and air can be increased, the gas circulation is further enhanced, the gas deflection is more obvious, and the air quantity and the air pressure can be further improved. The remaining structure is the same as that of the first embodiment and will not be described here.

Embodiment III:

as shown in fig. 8, the pits 22 are provided at both front and rear ends of the spin basket 2, thereby enhancing the fluid velocity at both front and rear sides of the volute tongue.

Embodiment four:

as shown in fig. 9, the pits 22 are distributed over the entire surface of the spin column 2, and the density of the pits 22 is greatest near the center line C of the spin column 2 and becomes gradually smaller toward the front and rear ends, thereby making the increase in the fluid velocity in the middle region of the spin column 2 more remarkable.

Fifth embodiment:

as shown in fig. 10, the pits 22 are distributed over the entire surface of the spin column 2, and the density of the pits 22 is minimized near the center line C of the spin column 2 and gradually increases toward the front and rear ends, thereby making the increase in fluid velocity more pronounced on both the front and rear sides of the spin column 2.

Example six:

as shown in fig. 11, the diameter of the spin column 2 is gradually changed, and the diameter of the spin column 2 is gradually reduced from the middle to the front and rear ends. At this time, the air flow deflects towards the front and back sides, so that the air flow is more uniform.

Embodiment seven:

as shown in fig. 12, the diameter of the spin column 2 is gradually changed, and the diameter of the spin column 2 is gradually increased from the middle to the front and rear ends. At this time, the front and rear air flows are deflected toward the middle.

Claims

1. The utility model provides a fan volute tongue, includes volute tongue body (1), its characterized in that: the utility model discloses a spiral tongue body, including spiral tongue body (1), install tongue body (1) and install on the front wall (12) and back wall (13) of spiral tongue body (1), install mounting groove (11) along the length direction distribution of spiral tongue body (1), install column of rotation (2) in mounting groove (11), install respectively on the front wall (12) and the back wall (13) of mounting groove (11) on front wall (12) or back wall (13) of mounting groove (11) install the drive piece that drive column of rotation (2) was rotatory, the both ends of column of rotation (2) have outwards extended installation axle (21), and installation axle (21) of one end are installed on front wall (12) of mounting groove (11), and installation axle (21) of the other end are installed on back wall (13) of mounting groove (11), the drive piece adopts motor (3), the output shaft of motor (3) passes front wall (12) or back wall (13) of mounting groove and is connected with corresponding installation axle (21), the cross section of column of rotation (2) has circular column of rotation (11) phase-match.

2. A fan volute tongue according to claim 1, wherein: the upper wall surface of the volute tongue body (1) is a guide wall (14), the lower wall surface of the volute tongue body (1) is a backflow wall (15), the rotating column (2) is connected between the guide wall (14) and the backflow wall (15), and the surface of the rotating column (2) is in smooth transition with the surfaces of the guide wall (14) and the backflow wall (15).

3. A fan volute tongue according to claim 1 or 2, wherein: pits (22) are formed on the surface of the rotary column (2).

4. A fan volute tongue according to claim 3, wherein: the pit (22) is arranged in the middle section area of the rotary column, and the density of the pit (22) is maximum near the center line of the rotary column (2) and gradually becomes smaller towards the front end and the rear end.

5. A fan volute tongue according to claim 3, wherein: the pits (22) are arranged in the front section area and the rear section area of the rotary column (2).

6. A fan volute tongue according to claim 3, wherein: the pits (22) are distributed on the whole surface of the rotary column (2), and the density of the pits (22) is the largest near the center line of the rotary column (2) and gradually becomes smaller towards the front end and the rear end.

7. A fan volute tongue according to claim 1 or 2, wherein: the diameter of the rotary column (2) is gradually changed, and the diameter of the rotary column (2) is gradually reduced from the middle to the front end and the rear end.

8. A fan volute tongue according to claim 1 or 2, wherein: the diameter of the rotary column (2) is gradually changed, and the diameter of the rotary column (2) is gradually increased from the middle to the front end and the rear end.