Kinetic energy recovery type air duct structure for fan

Abstract

The utility model discloses a kinetic energy recovery type air duct structure for a fan, which comprises an outer air duct, an inner air duct, an inner air duct and an outer air duct, the inner air duct is in a streamline shape, the caliber of the inner air duct is large, the caliber of the inner air duct is small, the small-caliber end of the inner air duct is embedded and fixed to the large-caliber end of the outer air duct, and the small-caliber end of the inner air duct extends into the outer air duct and is flush with the smallest-caliber position of the outer air duct. While the impeller operates efficiently in the streamline inner air duct, the Bernoulli effect of high-speed airflow at an outlet of the impeller is utilized, airflow is driven to enter the air duct from the space between the inner shell and the outer shell, the flow is greatly increased, in addition, the speed of the airflow at the outlet of the impeller is reduced through the Bernoulli effect, and the impeller can break through the upper limit of acting under the condition of a conventional air duct. And finally, due to the fact that the speed of the high-speed airflow is reduced, the generated vortex noise is correspondingly reduced, and the overall performance is as follows: the work of the impeller is increased, the air volume is larger, the efficiency is improved, and the noise is lower.

Description

Technical Field

[0001] This utility model relates to the field of axial flow fan technology, and in particular to a kinetic energy recovery type air duct structure for fans. Background Technology

[0002] Axial flow fans are widely used for ventilation in factories, mines, tunnels, cooling towers, vehicles, and ships. They can also be used for ventilation or heat dissipation in metallurgical, chemical, light industrial, food, medical equipment, machinery equipment, and civil buildings. They can also be used as free-flowing fans.

[0003] Existing axial flow fans used for free-flowing fans generally have the impeller placed inside a cylindrical air duct. Due to the high-speed airflow, when used as a free-flowing fan, they generate a lot of airflow noise. At the same time, the airflow speed is too fast and it is no longer constrained by the air duct. The kinetic energy of the gas is quickly lost after exiting the air duct due to the obstruction of the surrounding still air. This results in a small fan volume and a short range. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a kinetic energy recovery type air duct structure for fans to solve the problems mentioned in the background art.

[0005] A kinetic energy recovery type air duct structure for a fan, comprising:

[0006] The external ventilation duct is streamlined and has one large and one small diameter opening;

[0007] The inner air duct is streamlined and has a large and a small diameter. The small diameter end of the inner air duct is embedded and fixed to the large diameter end of the outer air duct. The small diameter end of the inner air duct extends into the outer air duct and is flush with the smallest diameter of the outer air duct.

[0008] An impeller assembly is installed inside the inner duct, and the axis of the impeller assembly is flush with the outer duct.

[0009] Preferably, the diameter of the large-diameter end of the inner air duct is smaller than the diameter of the small-diameter end of the outer air duct.

[0010] Preferably, the small-diameter end of the external air duct is connected to a sound insulation component.

[0011] Preferably, the sound insulation component includes a hollow sound insulation sleeve, an outer sound insulation layer, a middle sound insulation layer, and an inner sound insulation layer, wherein the outer sound insulation layer, the middle sound insulation layer, and the inner sound insulation layer are installed sequentially from the outside to the inside inside the hollow sound insulation sleeve.

[0012] Preferably, the outer sound insulation layer is composed of rock wool, the middle sound insulation layer is composed of sound insulation felt, and the inner sound insulation layer is composed of sound-absorbing cotton.

[0013] Preferably, a female connecting ring is fixed to the outside of the small-diameter end of the external air duct, and a male connecting ring is fixed to one end of the hollow sound insulation sleeve near the female connecting ring. The surface of the female connecting ring has an annular threaded groove, and a threaded ring is fixed to the surface of the male connecting ring. The threaded ring is threadedly connected to the annular threaded groove.

[0014] Preferably, a sealing ring 1 is embedded and fixed on the surface of the male connecting ring and on both sides of the threaded ring, and a sealing ring 2 is embedded and fixed on the surface of the female connecting ring and on both sides of the annular threaded groove, with the sealing ring 1 and the sealing ring 2 in close contact.

[0015] The beneficial effects of this invention are as follows: While enabling the impeller to operate efficiently within the streamlined inner duct, the Bernoulli effect of the high-speed airflow at the impeller outlet is utilized to drive the airflow from between the inner and outer casings into the duct, significantly increasing the flow rate. In addition, the Bernoulli effect reduces the airflow velocity at the impeller outlet, allowing the impeller to exceed the upper limit of work capacity under conventional duct conditions. This results in a higher upper limit of work capacity for impellers of the same diameter. Finally, due to the decrease in the speed of the high-speed airflow, the generated vortex noise is also reduced accordingly. Overall, the impeller's work capacity is increased, the airflow is larger, the efficiency is higher, and the noise is lower. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall design of this utility model;

[0017] Figure 2 This is a schematic diagram of the left side of the entire utility model;

[0018] Figure 3 This is a schematic diagram of the left cross-section of the sound insulation component of this utility model;

[0019] Figure 4 This is a schematic cross-sectional view of the male connecting ring of this utility model from the right side.

[0020] Figure 5 This is a schematic diagram of the left cross-section of the female connecting ring of this utility model.

[0021] In the diagram: 1-Outer duct, 2-Inner duct, 3-Impeller assembly, 4-Sound insulation assembly, 41-Hollow sound insulation sleeve, 42-Outer sound insulation layer, 43-Middle sound insulation layer, 44-Inner sound insulation layer, 5-Male connecting ring, 51-Threaded ring, 52-Sealing ring one, 6-Female connecting ring, 61-Annular threaded groove, 62-Sealing ring two. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figures 1-2 A kinetic energy recovery type air duct structure for a fan, comprising:

[0024] External ventilation duct 1, which is streamlined and has a large and a small diameter at the opening;

[0025] The inner air duct 2 is streamlined and has a large and a small diameter. The small diameter end of the inner air duct 2 is embedded and fixed to the large diameter end of the outer air duct 1. The small diameter end of the inner air duct 2 extends into the outer air duct 1 and is flush with the smallest diameter of the outer air duct 1. The diameter of the large diameter end of the inner air duct 2 is smaller than the diameter of the small diameter end of the outer air duct 1.

[0026] Impeller assembly 3 is installed inside the inner air duct 2, with its axis aligned with the outer air duct 1. While enabling efficient operation of the impeller assembly 3 within the streamlined inner air duct 2, the Bernoulli effect of the high-speed airflow at the outlet of the impeller assembly 3 is utilized to drive the airflow from between the inner and outer casings into the duct, significantly increasing the flow rate. Furthermore, the Bernoulli effect reduces the airflow velocity at the outlet of the impeller assembly 3, allowing it to exceed the upper limit of work capacity under conventional duct conditions. This results in a higher upper limit of work capacity for impeller assemblies of the same diameter. Finally, the reduced speed of the high-speed airflow also reduces the generated vortex noise. Overall, the impeller assembly 3 exhibits increased work capacity, greater airflow, higher efficiency, and lower noise.

[0027] Please see Figures 1-5 The small-diameter end of the external air duct 1 is connected to a sound insulation component 4. The sound insulation component 4 includes a hollow sound insulation sleeve 41, an outer sound insulation layer 42, a middle sound insulation layer 43, and an inner sound insulation layer 44. The hollow sound insulation sleeve 41 has the outer sound insulation layer 42, the middle sound insulation layer 43, and the inner sound insulation layer 44 installed sequentially from the outside to the inside. By setting a hollow sound insulation sleeve 41 at the small-diameter end of the external air duct 1, and because the hollow sound insulation sleeve 41 has the outer sound insulation layer 42, the middle sound insulation layer 43, and the inner sound insulation layer 44 installed inside, and the outer sound insulation layer 42 is composed of rock wool, the middle sound insulation layer 43 is composed of sound insulation felt, and the inner sound insulation layer 44 is composed of sound-absorbing cotton, the sound insulation and noise reduction effect at the air outlet of the external air duct 1 can be achieved.

[0028] A female connecting ring 6 is fixed to the outside of the small-diameter end of the outer duct 1. A male connecting ring 5 is fixed to one end of the hollow sound insulation sleeve 41 near the female connecting ring 6. An annular threaded groove 61 is opened on the surface of the female connecting ring 6. A threaded ring 51 is fixed on the surface of the male connecting ring 5. The threaded ring 51 is threadedly connected to the annular threaded groove 61. When connecting the outer duct 1 and the hollow sound insulation sleeve 41, the female connecting ring 6 of the outer duct 1 is connected to the male connecting ring 5 of the hollow sound insulation sleeve 41. During this process, the hollow sound insulation sleeve 41 is rotated to align the threaded ring 51 with the annular threaded groove 61, so that the threaded ring 51 can be rotated into the annular threaded groove 61, thereby connecting the outer duct 1 and the hollow sound insulation sleeve 41.

[0029] Sealing ring 1 52 is embedded and fixed on the surface of the male connecting ring 5 and on both sides of the threaded ring 51. Sealing ring 2 62 is embedded and fixed on the surface of the female connecting ring 6 and on both sides of the annular threaded groove 61. Sealing ring 1 52 and sealing ring 2 62 are in close contact. When the male connecting ring 5 and the female connecting ring 6 are connected, the tight contact between sealing ring 1 52 and sealing ring 2 62 can improve the sealing performance between the male connecting ring 5 and the female connecting ring 6, thereby improving the sealing performance between the outer air duct 1 and the hollow sound insulation sleeve 41.

[0030] Furthermore, unless otherwise defined, the technical or scientific terms used in this application description shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "upper," "lower," "left," "right," etc., used in this application description to indicate relative direction or positional relationship are used only to indicate relative direction or positional relationship, and do not imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. When the absolute position of the described object changes, its relative positional relationship may also change accordingly, and therefore should not be construed as a limitation on this application. The terms "a," "one," or "the," etc., used in this application description should not be construed as an absolute limitation on quantity, but should be construed as indicating the existence of at least one. The terms "including," "comprising," etc., used in this application description mean that the element or object preceding the word covers the element or object listed after the word and its equivalents, without excluding other elements or objects.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A kinetic energy recovery type duct structure for a fan, characterized by, The utility model relates to a wind turbine, which comprises: An outer wind cylinder (1) with a streamlined shape and two different diameters; An inner wind cylinder (2) with a streamlined shape and two different diameters, the small-diameter end of which is embedded in the large-diameter end of the outer wind cylinder (1), and the small-diameter end of which extends into the outer wind cylinder (1) and is flush with the smallest-diameter end of the outer wind cylinder (1); A blade wheel assembly (3) installed inside the inner wind cylinder (2), the axis of which is flush with the outer wind cylinder (1).

2. A kinetic energy recovery wind tunnel structure for a fan as claimed in claim 1, wherein: The diameter of the large-diameter end of the inner wind cylinder (2) is smaller than that of the small-diameter end of the outer wind cylinder (1).

3. A kinetic energy recovery wind tunnel structure for a fan as claimed in claim 2, wherein: The small-diameter end of the outer wind cylinder (1) is connected with a sound insulation assembly (4).

4. A kinetic energy recovery wind tunnel structure for a fan as claimed in claim 3, wherein: The sound insulation assembly (4) comprises a hollow sound insulation sleeve (41), an outer sound insulation layer (42), a middle sound insulation layer (43), and an inner sound insulation layer (44), and the outer sound insulation layer (42), the middle sound insulation layer (43), and the inner sound insulation layer (44) are sequentially installed inside the hollow sound insulation sleeve (41) from outside to inside.

5. A kinetic energy recovery wind tunnel structure for a fan as claimed in claim 4, wherein: The outer sound insulation layer (42) is composed of rock wool, the middle sound insulation layer (43) is composed of sound insulation felt, and the inner sound insulation layer (44) is composed of sound-absorbing cotton.

6. A kinetic energy recovery wind tunnel structure for a fan as claimed in claim 5, wherein: The small-diameter end of the outer wind cylinder (1) is externally fixed with a female connecting ring (6), one end of the hollow sound insulation sleeve (41) near the female connecting ring (6) is fixed with a male connecting ring (5), the surface of the female connecting ring (6) is provided with an annular threaded groove (61), and the surface of the male connecting ring (5) is fixed with a threaded ring (51), which is threadedly connected with the annular threaded groove (61).

7. A kinetic energy recovery wind tunnel structure for a fan as claimed in claim 6, wherein: The surface of the male connecting ring (5) and located on both sides of the threaded ring (51) is embedded with a sealing ring one (52), and the surface of the female connecting ring (6) and located on both sides of the annular threaded groove (61) is embedded with a sealing ring two (62), and the sealing ring one (52) and the sealing ring two (62) are in close contact.

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