TWM653289U - Jet fan - Google Patents

Abstract

A jet fan comprises an pressurized air plenum, an unhoused centrifugal fan, and a laminarized airflow channel. The pressurized air plenum is configured as a hollow rectangular structure, with a bottom surface featuring a suction hole and a front side forming an opening. The unhoused centrifugal fan positioned within the pressurized air plenum and corresponding to the location of the suction hole. The laminarized airflow channel is equipped with a shell, wherein the rear end of the shell forms an air inlet and the front end forms an air outlet, with the air inlet connected to the opening. When the unhoused centrifugal fan is operating, which draws in air through the suction hole, generating airflow that passes through the laminarized airflow channel and is expelled from the air outlet. The jet fan aims to reduce noise and vibrations, prevent energy loss, and enhance the effective jet stream distance.

Description

Jet fan

This creation relates to a jet fan, specifically a jet fan that uses the structure of a pressurized bellows and a shellless centrifugal fan to reduce noise, vibration and energy consumption and increase thrust.

In response to the public's increasing demand for parking spaces, most modern buildings have indoor parking lots. A large amount of exhaust gas emitted by cars stays in a closed space for a long time, which will have an adverse effect on the human body and needs to be discharged through ventilation equipment. Considering the indoor height of the building and the installation cost, most indoor parking lots currently abandon the traditional duct system and use jet fans instead, which disturb the indoor air flow by emitting high-speed airflow and induce indoor air circulation.

However, the commonly used jet fans do not take into account the efficiency loss caused by the system effect in their structural design, that is, the airflow at the inlet cannot be fully developed and formed to produce vortices, and the airflow flow field discharged by the centrifugal fan cannot be distributed and diffused to become a nearly fully formed flow, which in turn leads to an increase in the resistance of the centrifugal fan, a decrease in the air supply volume, and an increase in equipment noise and vibration.

In addition, because the design of the jet fan's air outlet affects the airflow push distance, under the condition of the same pipe cross-sectional area, the resistance of high-speed airflow passing through the pipe increases with the increase of the pipe width-to-height ratio, causing the airflow to immediately diffuse up and down after leaving the air outlet, and the push distance is greatly reduced. The commonly used jet fans use a single-sided contraction tube acceleration, and the air outlet width-to-height ratio is relatively large. In addition to the centrifugal fan thrust efficiency (the thrust generated by the centrifugal fan for each kilowatt input) is reduced, it also causes airflow separation in the pipe, increased turbulence and increased wind pressure loss.

Furthermore, the setting of the jet fan is affected by the geometry of the parking lot space. The jet distance required to achieve the effect of inducing indoor air circulation varies. Conventional jet fans mostly use fixed air volume and thrust, which cannot be adjusted according to the actual space. The thrust of the centrifugal fan is adapted to meet different jet distance requirements, resulting in energy consumption of the jet fan.

Based on the above situation, in order to improve the shortcomings, the creator devoted himself to research and combined with the application of academic theory to come up with a design and understanding that can effectively improve the above problems.

The main purpose of this creation is to provide a jet fan that can be achieved by optimally matching the size of the impeller between the pressurized air box and the shellless centrifugal fan, as well as the inclination angle of the top surface and both sides of the rectifying air duct housing and the air outlet. The aspect ratio design reduces noise and vibration, avoids energy loss and increases the effective jet distance.

In order to achieve the above purpose, this invention provides a jet fan, which includes: a pressurized bellows in the shape of a hollow rectangular parallelepiped, with a suction inlet on the bottom surface and an opening formed on the front side; a shellless centrifugal fan, which is arranged on the pressurized air box. A position in the air box corresponding to the suction inlet; and a rectifying air duct, which has a shell, the rear end of the shell forms an air inlet and the front end forms an air outlet, and the air inlet and the opening are interconnected; the When the casingless centrifugal fan is running, air will be introduced from the suction port to generate airflow, and the airflow will pass through the rectifying air duct and be ejected from the air outlet.

This invention has the following beneficial effects: (1) it can avoid noise, vibration and reduction of air supply volume caused by system effects, thereby improving the energy efficiency of the jet fan; (2) through the design of the rectifying air duct, the thrust efficiency and effective spray distance of the shellless centrifugal fan are improved; (3) the shellless centrifugal fan can be configured with a control module, which can adjust the thrust of the shellless centrifugal fan according to the actual installation space of the jet fan to meet different required spray distances, thereby saving the energy consumption of the jet fan.

In order to further understand the characteristics and content of this creation, please refer to the following detailed description and drawings about this creation. However, the attached drawings are only for reference and illustration and are not used to limit this creation.

As shown in FIG. 1 and FIG. 2 of the present invention, an embodiment of the jet fan 1 of the present invention comprises: a pressurized bellows 2, which is in the shape of a hollow rectangular parallelepiped, and has a suction port 21 on its bottom surface and an opening 22 formed on the front side; a shellless centrifugal fan 3, which is arranged in the pressurized bellows 2 and corresponds to the position of the suction port 21, and the shellless centrifugal fan 3 and the suction port 21 are approximately located at the center of the bottom surface. Compared with the traditional centrifugal fan, the shellless centrifugal fan 3 is smaller in size without the snail shell and can meet any air outlet direction; a rectifying air duct 4, It has a shell 41, with an air inlet 42 formed at the rear end of the shell 41 and an air outlet 43 formed at the front end. The air inlet 42 is connected to the opening 22. When the shellless centrifugal fan 3 is running, air is introduced from the suction port 21 to generate airflow, and the airflow passes through the rectifying air duct 4 and is ejected from the air outlet 43.

In another preferred embodiment of the jet fan 1 of the present invention, the ratio of any side length of the bottom surface of the pressurized air box 2 to the diameter of the impeller (not numbered) of the shellless centrifugal fan 3 is greater than or equal to 1.6 and less than 1.8, so that the air flow field ejected by the shellless centrifugal fan 3 can be distributed and diffused in the pressurized air box 2 into a nearly completely formed flow, so that the internal pressure of the box is relatively increased, which can avoid system effects and reduce the energy generated during operation. Noise and vibration, improve air supply volume and energy efficiency of the jet fan 1.

In another preferred embodiment of the jet fan 1 of the present invention, as shown in Figures 3 and 4 of the present invention, the angle at which the top surface of the shell 41 of the rectifying air duct 4 is tilted downward and the angle α at which the two side surfaces are tilted inward are greater than 15° and less than or equal to 30°, the ratio of the width to height of the air outlet 43 is greater than 4 and less than or equal to 5.5, and an air outlet grille 5 can be further provided at the air outlet 43 to assist in stabilizing the flow or adjusting the wind direction. When the airflow in the pressurized bellows 2 passes through the opening 22 and enters the rectifying air duct 4 from the air inlet 42, the tilt angle rectifies and accelerates the airflow, and combined with the design of the width-to-height ratio of the air outlet 43, the pipeline resistance on the high-speed airflow can be reduced, and the airflow is prevented from immediately diffusing up and down into a fan shape after leaving the air outlet 43. The thrust efficiency of the shellless centrifugal fan 3 and the effective jet distance of the jet fan 1 are greatly improved.

In another preferred embodiment of the jet fan 1 of the present invention, the caseless centrifugal fan 3 is connected (not labeled) to a control module 6, and the motor of the caseless centrifugal fan 3 can be an electronically commutated motor ( EC motor), the control module 6 can adjust the thrust of the casingless centrifugal fan 3 according to the geometric jet connection distance requirements of the indoor parking space where the jet fan 1 is installed, so as to save the energy consumption of the jet fan 1.

In summary, the invention has the following beneficial effects: (1) it can avoid noise, vibration and reduction of air supply volume caused by system effect, thereby improving the energy efficiency of the jet fan; (2) through the design of the rectifying air duct, the thrust efficiency and effective spray distance of the shellless centrifugal fan are improved; (3) by adopting the configurable control module of the shellless centrifugal fan, the thrust of the shellless centrifugal fan can be adjusted according to the actual installation space of the jet fan to meet different required spray distances, thereby saving the energy consumption of the jet fan.

The above is only the best feasible embodiment of this creation, and it does not limit the scope of patent protection of this creation. Therefore, any equivalent technical changes made by using the instructions and diagrams of this creation should be considered to be included in the scope of protection of the rights of this creation and shall be stated.

1: jet fan 2: pressurized bellows 21: inlet 22: opening 3: shellless centrifugal fan 4: rectifier air duct 41: shell 42: air inlet 43: air outlet 5: air outlet grille 6: control module

Figure 1 is a side view of the jet fan of this invention.

Figure 2 is a bottom view of the jet fan of this invention.

FIG. 3 is a side view of the rectifying air duct of the jet fan of the present invention.

Figure 4 is a bottom view of the rectifying air duct of the jet fan of this invention.

1:Jet fan

2: Pressurized bellows

21: Inlet

22: Open mouth

3: Shellless centrifugal fan

4: Rectification duct

41: Shell

42: Air inlet

43: Air outlet

5: Wind grille

6: Control module

Claims (7)

A jet fan comprises: A pressurized bellows in a hollow rectangular shape, with a suction port on the bottom and an opening on the front; A shellless centrifugal fan arranged in the pressurized bellows and corresponding to the suction port; and A rectifying air duct having a shell, with an air inlet formed at the rear end of the shell and an air outlet formed at the front end, the air inlet and the opening being interconnected; When the shellless centrifugal fan is in operation, air is introduced from the suction port to generate airflow, and the airflow passes through the rectifying air duct and is ejected from the air outlet. A jet fan as described in claim 1, wherein the ratio of any side length of the bottom surface of the pressure bellows to the diameter of the impeller of the shellless centrifugal fan is greater than or equal to 1.6 and less than 1.8. A jet fan as described in claim 1, wherein the shell of the rectifying air duct has a top surface, a bottom surface and two side surfaces, the top surface is formed by extending forward and obliquely downward from the rear end of the rectifying air duct, and the two side surfaces are formed by extending forward and obliquely inward from the rear end of the rectifying air duct. The jet fan according to claim 3, wherein the angle at which the top surface of the housing of the rectifying air duct is inclined downward and the angle at which both sides are inclined inward is greater than 15° and less than or equal to 30°. The jet fan according to claim 1, wherein the aspect ratio of the air outlet is greater than 4 and less than or equal to 5.5. The jet fan according to claim 1, wherein an air outlet grille is provided at the air outlet. The jet fan according to claim 1, wherein a control module is provided on the rear side of the pressurized air box, and the control module is connected to the caseless centrifugal fan to adjust the thrust of the caseless centrifugal fan.