CN214065247U

CN214065247U - Centrifugal air duct based on coanda effect

Info

Publication number: CN214065247U
Application number: CN202023039708.8U
Authority: CN
Inventors: 刘东海; 杨威; 蔺勇智
Original assignee: Infinitus China Co Ltd
Current assignee: Infinitus China Co Ltd
Priority date: 2020-12-16
Filing date: 2020-12-16
Publication date: 2021-08-27
Anticipated expiration: 2030-12-16

Abstract

The utility model relates to a centrifugal wind channel technical field, more specifically relates to a centrifugal wind channel based on the coanda effect. The centrifugal air duct comprises a volute assembled with a wind wheel, wherein a diffusion opening is formed in the opening of the volute, the inner wall of one side, opposite to a volute tongue, of the diffusion opening is a coanda effect surface, the coanda effect surface is an inward convex curved surface, and the coanda effect surface protrudes towards the opening of the volute; the volute side wall comprises a volute tongue section, a worm wheel section and a volute back section which are sequentially connected, and the volute back section is connected with the coanda effect surface of the diffusion opening. The inner wall of the diffuser opposite to the volute tongue is designed with an inner convex curved surface with continuous curvature, so that fluid is rubbed on the surface of the curved surface to form fluid deflection, the characteristic of fluid viscosity is utilized, the air kinetic energy loss is reduced, the sectional area of the diffuser is fully utilized, the air outlet efficiency is improved, the air outlet speed is uniform, and the performance requirements of large purification amount and low noise are met.

Description

Centrifugal air duct based on coanda effect

Technical Field

The utility model relates to a centrifugal wind channel technical field, more specifically relates to a centrifugal wind channel based on the coanda effect.

Background

High-end air purifier on the current market all pursues the index parameter that the purification volume is big, and the noise is little. Most purifiers are realized by a structure that a centrifugal air duct is matched with a horn-shaped diffusion opening, and the centrifugal air duct is characterized in that the air is divided by a volute tongue, the air outlet direction is obliquely upward (the volute outlet discharges air along the tangent line of a fan), so that the local air quantity of an air outlet is easily concentrated, the air kinetic energy loss at the diffusion opening wall opposite to the volute tongue is large, and the high noise of the local air speed is caused.

Chinese patent publication No. CN203964281U, 2014-11-26, discloses a centrifugal air duct for an indoor cabinet of an air conditioner, which uses an arc structure, a concave-convex arc structure or a convex particle structure to disturb a turbine formed by air flow at the place, so as to reduce noise. However, the setting positions of the arc structure, the concave-convex arc structure or the convex particle structure disclosed in the technical scheme are ambiguous and uncertain, and in the air outlet channel of the centrifugal air duct, slight changes of the structure points can cause different degrees of noise, so the design of the diffuser structure needs to be further improved.

SUMMERY OF THE UTILITY MODEL

The utility model discloses an overcome the local amount of wind of current centrifugal wind channel diffusion mouth and concentrate with the too big, the air-out inefficiency problem that causes of local air kinetic energy loss, provide a centrifugal wind channel based on the coanda effect, use based on the coanda effect, carry out the design improvement to the diffusion mouth in centrifugal wind channel, make the fluid form the fluid at curved surface skin friction and deflect to noise reduction.

In order to solve the technical problem, the utility model discloses a technical scheme is:

a centrifugal air duct based on a coanda effect comprises a volute assembled with a wind wheel, wherein a diffuser is arranged at the opening of the volute, the inner wall of one side of the diffuser, which is opposite to a volute tongue, is a coanda effect surface, the coanda effect surface is an inward convex curved surface, and the coanda effect surface protrudes towards the opening of the volute; the volute side wall comprises a volute tongue section, a worm wheel section and a volute back section which are sequentially connected, and the volute back section is connected with the coanda effect surface of the diffusion opening.

The centrifugal wind wheel is arranged in the volute, the centrifugal wind wheel is driven to rotate by the motor, so that air fluid is accelerated in the volute, and most of air is shunted by the volute tongue and is discharged through the diffusion opening. The volute is characterized in that the inner curved surface of the volute part is generated by an Archimedes spiral equation, the air diffuser part is smoothly connected with the volute, the curved surface of the diffuser opposite to the volute tongue is set to be an inward convex curved surface, and the design is based on the coanda effect. The Coanda Effect (Coanda Effect) is also known as the Coanda Effect or Coanda Effect. When there is surface friction (also called fluid viscosity) between the fluid and the surface of the object through which the fluid flows, the fluid will flow along the surface of the object as long as the curvature is not large.

The inner wall of the diffuser opposite to the volute tongue is designed with an inner convex curved surface with continuous curvature, so that fluid is rubbed on the surface of the curved surface to form fluid deflection, the characteristic of fluid viscosity is utilized, the air kinetic energy loss is reduced, the sectional area of the diffuser is fully utilized, the air outlet efficiency is improved, the air outlet speed is uniform, and the performance requirements of large purification amount and low noise are met.

As one preferable scheme, the coanda effect surface is provided with a convex point, the convex point is in projection distance am with the center of the volute on one side of the worm back section, and the distance od from the center of the volute to the bottom end of the worm wheel section is greater than or equal to 1.5 od. When air is discharged, the air current flows along with the surfaces of the convex points, the air outlet area is enlarged, the air kinetic energy loss is reduced, and the noise is reduced.

In one preferable scheme, the vertical distance between the convex point and the snail back section is 20-30 mm. The height of the convex point is regulated according to the size constraint of a product and mainly based on the following two points, firstly, the connection between a coanda effect surface where the convex point is located and a volute needs to keep smooth transition, and the direction of fluid can be changed along the surface flow; second, it is ensured that there is a certain fluid flow rate at the wall, so that it can be deflected. The fluid has the velocity of flow certainly, and its velocity of flow has certain influence to this product coanda effect' S validity, and this scheme suggestion is suitable for export gas velocity of flow S and is: s is more than 1m/S and less than 15 m/S. Without a flow velocity at the wall, the fluid cannot rub against the volute wall to deflect the direction of the fluid.

Preferably, the included angle between the volute back section and the central vertical axis of the volute is 8-12 degrees.

As a preferable scheme, the length of a perpendicular line from the center of the volute to the back section of the volute is the opening degree of the volute, and the opening degree of the volute is 60-70 mm.

Preferably, the worm back section is tangent to the worm wheel section. The wind current flows out from the centrifugal wind wheel, along the worm wheel section and the worm back section and finally flows out from the diffusion opening.

In one preferable scheme, the inner wall of one side of the diffusion opening connected with the volute tongue section is matched with the volute tongue shape trend. The inner wall of one side of the diffusion opening connected with the volute tongue section conforms to the extending direction of the volute tongue.

Preferably, the diffuser inner wall is in smooth butt joint with the volute inner wall.

Preferably, the diffuser is detachably connected with the volute. The diffusion opening is in threaded connection or clamped connection with the mouth of the volute air outlet.

Alternatively, the diffuser and the volute may be formed by injection molding.

Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses a centrifugal wind channel based on coanda effect, diffuser are based on coanda effect design, at the continuous interior convex curved surface of relative diffuser inner wall design camber of spiral tongue, make the fluid form the fluid deflection at curved surface skin friction, utilize fluid viscidity's characteristic, reduce the loss of air kinetic energy, and the sectional area of make full use of diffuser improves air-out efficiency, even air-out wind speed to it is big to reach purification volume, the performance requirement that the noise is little.

Drawings

Fig. 1 is a schematic view of the overall structure of embodiment 1 of the present invention.

Fig. 2 is a front view of the overall structure of embodiment 1 of the present invention.

Fig. 3 is a spiral casing rotation process diagram of embodiment 1 of the present invention.

Fig. 4 is a kodak effect surface generation diagram of embodiment 1 of the present invention.

Wherein, 1 volute, 2 diffusion openings, 3 coanda effect surfaces, 4 salient points, 11 volute tongue sections, 12 worm wheel sections and 13 volute back sections.

Detailed Description

The drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.

The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are the terms "upper", "lower", "left", "right", "long", "short", etc. indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore the terms describing the positional relationship in the drawings are only for illustrative purposes and are not to be construed as limiting the present patent, and those skilled in the art will understand the specific meaning of the terms according to their specific circumstances.

The technical solution of the present invention is further described in detail by the following specific embodiments in combination with the accompanying drawings:

example 1

As shown in fig. 1-2, the present embodiment provides a centrifugal air duct based on the coanda effect, including a volute casing 1 assembled with a wind wheel, where an opening of the volute casing 1 is provided with a diffuser 2, the diffuser 2 is detachably connected to the volute casing 1, and in the present embodiment, the diffuser 2 is connected to an air outlet opening of the volute casing 1 by a bolt. The inner walls of the diffuser 2 at all sides are smoothly butted with the inner wall of the volute 1, and the inner wall of one side of the diffuser 2 connected with the volute tongue section 11 is matched with the extension direction of the volute tongue shape.

Wherein, the inner wall of one side of the diffusion opening 2 opposite to the volute tongue is a coanda effect surface 3, the coanda effect surface 3 is an inward convex curved surface, and the coanda effect surface 3 protrudes towards the opening of the volute 1. The Coanda Effect (Coanda Effect) is also known as the Coanda Effect or Coanda Effect. The fluid has a tendency to flow along the convex object surface instead of the original flow direction, and when surface friction exists between the fluid and the object surface through which the fluid flows, namely the viscosity of the fluid, the fluid flows along the object surface as long as the curvature is not large.

Specifically, the side wall of the volute 1 comprises a volute tongue section 11, a worm wheel section 12 and a volute back section 13 which are sequentially connected, the volute back section 13 is tangent to the worm wheel section 12, and the volute back section 13 is connected with the coanda effect surface 3 of the diffuser 2. The centrifugal wind wheel is arranged in the volute 1, the centrifugal wind wheel is driven to rotate by the motor, so that air fluid is accelerated in the volute 1, and most of air is shunted and discharged through the diffusion opening 2 along the worm wheel section 12 and the volute back section 13 through the volute tongue. The inner curved surface of the volute 1 is generated by an Archimedes spiral equation, the diffuser part is smoothly connected with the volute 1, and the curved surface of the diffuser 2 opposite to the volute tongue is set as a coanda effect surface 3.

According to an Archimedes spiral equation, a spiral casing 1 curve of a centrifugal air duct is generated, in order to better utilize the coanda effect and achieve the fluid wall attachment effect, through a plurality of fluid simulation researches and experiments, the spiral casing 1 is most suitable to rotate by 10 degrees +/-2 degrees towards the air flow direction, namely, the included angle between the spiral back section 13 and the central vertical axis of the spiral casing 1 is 10 degrees +/-2 degrees, in the embodiment, the included angle is 10 degrees, as shown in FIG. 3.

The center of the volute 1 is o, the bottom end of the worm wheel section 12 is d, and the distance od from the center of the volute 1 to the bottom end of the worm wheel section 12 is.

The length of a perpendicular line from the center of the volute 1 to the volute back section 13 is the opening degree of the volute 1, the perpendicular line intersects with the volute back section 13 at a, and the opening degree of the volute 1 is 65 mm.

The coanda effect surface 3 is provided with a convex point 4, as shown in fig. 4, after the volute 1 rotates, a tangent line ac is made at the opening A end point a of the volute 1, a point m is taken on the tangent line ac, am is the projection distance between the convex point 4 and the center of the volute 1 on one side of the volute back section 13, and am is limited to be more than or equal to 1.5 times od.

And drawing an ac vertical line bm through the point m, wherein the point b is a convex point 4 of the coanda effect surface 3. The vertical distance between the convex point 4 and the snail back section 13, namely bm, usually ranges from 20 to 30mm, and the value of this embodiment is 25 mm. bm value needs to be regulated according to product size constraint and is mainly adjusted based on the following two points, firstly, the connection between the coanda effect surface 3 where the convex point 4 is located and the volute 1 needs to keep smooth transition, and the fluid can flow along the surface to change the direction; second, there is a certain fluid flow rate at the wall to deflect it.

The inner wall of the diffuser 2 opposite to the volute tongue is provided with an inner convex curved surface with continuous curvature, so that fluid is rubbed on the surface of the curved surface to form fluid deflection, and the characteristic of fluid viscosity is utilized to enable wind flow to adhere to the inner wall of the diffuser 2 to change the wind outlet direction of the volute back section 13, increase the wind outlet area, reduce the air kinetic energy loss, fully utilize the sectional area of the diffuser 2, improve the wind outlet efficiency, and uniformly wind outlet speed, so as to meet the performance requirements of large purification amount and low noise.

In the detailed description of the embodiments, various technical features may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not limitations to the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. The utility model provides a centrifugal wind channel based on coanda effect, includes spiral case (1) with the wind wheel assembly, the oral area of spiral case (1) is equipped with diffusion mouth (2), its characterized in that:

the inner wall of one side of the diffusion opening (2) opposite to the volute tongue is a coanda effect surface (3), the coanda effect surface (3) is an inward convex curved surface, and the coanda effect surface (3) is convex towards the opening of the volute (1);

the volute (1) side wall comprises a volute tongue section (11), a worm wheel section (12) and a volute back section (13) which are sequentially connected, and the volute back section (13) is connected with the coanda effect surface (3) of the diffusion opening (2).

2. The coanda effect-based centrifugal wind tunnel of claim 1, wherein: the coanda effect surface (3) is provided with a convex point (4), the convex point (4) and the center of the volute (1) are at a projection distance am on one side of the volute back section (13), and the center of the volute (1) is at a distance od to the bottom end of the worm wheel section (12), wherein am is more than or equal to 1.5 od.

3. The coanda effect-based centrifugal wind tunnel of claim 2, wherein: the vertical distance between the convex point (4) and the snail back section (13) is 20-30 mm.

4. The coanda effect-based centrifugal wind tunnel of claim 3, wherein: the included angle between the volute back section (13) and the central vertical axis of the volute (1) is 8-12 degrees.

5. The coanda effect-based centrifugal wind tunnel of claim 4, wherein: the length of a perpendicular line from the center of the volute (1) to the volute back section (13) is the opening degree of the volute (1), and the opening degree of the volute (1) is 60-70 mm.

6. The coanda effect-based centrifugal wind tunnel of claim 5, wherein: the worm back section (13) is tangent to the worm wheel section (12).

7. The coanda effect-based centrifugal wind tunnel according to any one of claims 1 to 6, wherein: the inner wall of one side of the diffusion opening (2) connected with the volute tongue section (11) is matched with the shape and the trend of the volute tongue.

8. The coanda effect-based centrifugal wind tunnel of claim 7, wherein: the inner wall of the diffusion opening (2) is smoothly butted with the inner wall of the volute (1).

9. The coanda effect-based centrifugal wind tunnel of claim 8, wherein: the diffusion opening (2) is detachably connected with the volute (1).

10. The coanda effect-based centrifugal wind tunnel of claim 8, wherein: and the diffusion opening and the volute are integrally formed by injection molding.