WO2019085570A1 - Air pipe and fan system - Google Patents

Abstract

Provided is an air pipe, comprising a first pipe (110) and a second pipe (120) which communicate with each other and are non-collinear. Air passes through the first pipe (110) and the second pipe (120) in sequence; and since the connecting position of the first pipe (110) and the second pipe (120) is of a certain angle, in order to prevent the phenomenon of swirls, and same causing energy loss, and a pressure difference between air coming out of the first and second pipes, a flow guide plate (140) is arranged at the communicating position of the second pipe (120) and the first pipe (110) for removing, by means of the flow guide plate (140), the swirls and turbulent flow caused by the angle when the air flows from the first pipe (110) to the second pipe (120), so that the air transmission efficiency is improved. Provided is a fan system, comprising a centrifugal ventilator and the air pipe. The fan system is high in working efficiency and low in energy loss.

Description

Duct and fan system Technical field

The invention relates to the field of wind turbines, and in particular to a duct and a fan system.

Background technique

A fan is a mechanical machine that relies on input mechanical energy to increase gas pressure and deliver gas. It is a driven fluid machine. Fans are the abbreviations for gas compression and gas transmission machinery in China. The so-called fans include fans, blowers, and wind turbines. Fans are widely used for ventilation, dust extraction and cooling of plants, mines, tunnels, cooling towers, vehicles, ships and buildings, ventilation and drafting of boilers and industrial furnaces; cooling and ventilation in air conditioning equipment and household appliances Drying and selection of grain, wind tunnel source and inflation and propulsion of hovercraft.

As part of the fan, the duct is mainly used for supplying air to the fan. In the prior art, the air duct has a certain angle, and the gas loses more energy when passing through the air duct, and the air is uneven.

Summary of the invention

It is an object of the present invention to provide a duct comprising a first body and a second body that are interconnected and not collinear. The gas passes through the first pipe body and the second pipe body in turn. Since the first pipe body and the second pipe body are at a certain angle, in order to avoid vortex and cause energy loss and air pressure difference, in the second A baffle is arranged at a communication between the pipe body and the first pipe body, and the vortex and turbulence caused by the gas flowing in the first pipe body to the second pipe body due to the angle of the gas flow is increased by the deflector, thereby increasing gas transmission efficiency.

A second object of the present invention is to provide a fan system including a centrifugal fan and the above-described air duct. The air outlet of the air duct is connected with the centrifugal fan to provide a stable and uniform air volume for the centrifugal fan. The fan system has high efficiency and low energy loss.

Embodiments of the invention are implemented as follows:

A duct comprising a first tube body and a second tube body that are connected to each other and are not collinear; a baffle is disposed at a position where the second tube body communicates with the first tube body; and the first tube body is away from the second tube body One end is an air outlet; the end of the second pipe body away from the first pipe body is a first air inlet.

The air duct dissolves the vortex and turbulence caused by the gas flowing in the first pipe body to the second pipe body through the deflector, thereby increasing the gas transmission efficiency.

In one embodiment of the invention:

The deflector is disposed along the length of the first pipe body.

In one embodiment of the invention:

The deflector includes three; three baffles are arranged in parallel; the adjacent baffles are equally spaced.

In one embodiment of the invention:

The first tube body and the second tube body have the same diameter; the spacing between adjacent baffles is one quarter of the diameter of the first tube body.

In one embodiment of the invention:

The three baffles are successively reduced in length in the direction of the second pipe body.

In one embodiment of the invention:

The end of the baffle near the air outlet is flush.

In one embodiment of the invention:

The deflector is provided with a flow guiding groove in the longitudinal direction of the first pipe body.

In one embodiment of the invention:

The air outlet includes a first air outlet and a second air outlet having the same diameter.

In one embodiment of the invention:

The first pipe body further has a second air inlet at an end away from the air outlet; the baffle is disposed at a side of the intersection of the first pipe body and the second pipe body near the air outlet.

A fan system includes a centrifugal fan and the above air duct; the duct air outlet is in communication with the centrifugal fan.

The fan system has high efficiency and low energy loss.

The technical solution of the present invention has at least the following beneficial effects:

The present invention provides a duct comprising a first tube and a second tube that are in communication with each other and are not collinear. The gas passes through the first pipe body and the second pipe body in turn. Since the first pipe body and the second pipe body are at a certain angle, in order to avoid vortex and cause energy loss and air pressure difference, in the second A baffle is arranged at a communication between the pipe body and the first pipe body, and the vortex and turbulence caused by the gas flowing in the first pipe body to the second pipe body due to the angle of the gas flow is increased by the deflector, thereby increasing gas transmission efficiency.

The present invention also provides a fan system including a centrifugal fan and the above-described air duct. The air outlet of the air duct is connected with the centrifugal fan to provide a stable and uniform air volume for the centrifugal fan. The fan system has high efficiency and low energy loss.

DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly described below. It should be understood that the following drawings show only certain embodiments of the present invention, and therefore It should be seen as a limitation on the scope, and those skilled in the art can obtain other related drawings according to these drawings without any creative work.

1 is a schematic view showing the working state of a duct in the prior art;

2 is a schematic cross-sectional structural view of a duct in Embodiment 1 of the present invention;

3 is a schematic view showing the working state of the air duct in Embodiment 1 of the present invention;

4 is a schematic structural view of a deflector according to Embodiment 1 of the present invention.

In the figure: 10-turbulent flow; 20-vortex; 100-duct; 110-first pipe; 120-second pipe; 131-first air outlet; 133-second air outlet; 111-first air inlet ; 121 - second air inlet; 140 - baffle; 141 - diversion channel.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. It is a partial embodiment of the invention, and not all of the embodiments. The components of the embodiments of the invention, which are generally described and illustrated in the figures herein, may be arranged and designed in various different configurations.

Therefore, the following detailed description of the embodiments of the invention in the claims All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

It should be noted that similar reference numerals and letters indicate similar items in the following figures, and therefore, once an item is defined in a drawing, it is not necessary to further define and explain it in the subsequent drawings. Moreover, the terms "first", "second", etc. are used merely to distinguish a description, and are not to be construed as indicating or implying a relative importance.

In the description of the embodiments of the present invention, it is to be noted that the orientation or positional relationship of the terms "inside", "outer", "upper", etc. is based on the orientation or positional relationship shown in the drawings, or the product of the invention. The orientation or positional relationship that is conventionally placed in use is merely for the convenience of the description of the present invention and the description of the present invention, and is not intended to indicate or imply that the device or component referred to has a specific orientation, is constructed and operated in a specific orientation, and therefore cannot be understood. To limit the invention.

A fan is a mechanical machine that relies on input mechanical energy to increase gas pressure and deliver gas. It is a driven fluid machine. Fans are the abbreviations for gas compression and gas transmission machinery in China. The so-called fans include fans, blowers, and wind turbines. Fans are widely used for ventilation, dust extraction and cooling of plants, mines, tunnels, cooling towers, vehicles, ships and buildings, ventilation and drafting of boilers and industrial furnaces; cooling and ventilation in air conditioning equipment and household appliances Drying and selection of grain, wind tunnel source and inflation and propulsion of hovercraft.

As part of the fan, the duct is mainly used for supplying air to the fan. In the prior art, the air duct has a certain angle, and the gas loses more energy when passing through the air duct, and the air is uneven.

The inventors have found that, referring to Figure 1, the gas energy loss is high and the wind is uneven.

When the airflow at the inlet of the first tubular body 110 merges with the airflow at the inlet of the second tubular body 120, a turbulent flow 10 and a vortex 20 will be formed at the meeting point. According to Bernoulli's theorem, if the cross-sectional area of the first pipe body 110 and the second pipe body 120 is equal to the area of the merged pipe, the flow will be accelerated after the gas merges, and the first pipe body 110 is advanced due to the existence of the angle. The airflow of the air port will be separated at the corner, and the airflow of the air inlet of the first pipe body 110 will push most of the gas to the right side of the pipe under the action of inertia, resulting in a high flow velocity on the right side of the pipe after the convergence, left The side airflow rate is low. Under the viscous shearing action, the airflow on the right side will drive the left gas to accelerate the flow to form a vortex. The presence of vortices will consume a large amount of energy, increasing the flow energy loss of the pipeline, thereby increasing the pressure difference between the inlet and the outlet.

In addition, the vortex 20 and the turbulent flow 10 not only increase the flow loss of the pipeline, but also result in uneven distribution of the air outlet flow. The flow on the left side of the pipeline is congested due to the existence of the vortex, and the right side fluid accelerates the flow, resulting in the mass flow of the left air outlet. Less than the mass flow rate of the right side air outlet.

According to the above deficiencies, the following specific embodiments are provided:

Example 1

Referring to FIG. 2, a duct 100 is provided in the embodiment, which includes a first tube body 110 and a second tube body 120 that are connected to each other and are not collinear. An end of the first pipe body 110 away from the second pipe body 120 is an air outlet, and an end of the second pipe body 120 away from the first pipe body 110 is a first air inlet 111.

In use, the gas passes through the first pipe body 110 and the second pipe body 120 in sequence, because the first pipe body 110 and the second pipe body 120 are at an angle to avoid vortexes, and cause energy loss and air pressure. A poor phenomenon is provided. Therefore, a baffle 140 is disposed at a position where the second pipe body 120 communicates with the first pipe body 110, and the flow of the gas in the first pipe body 110 to the second pipe body 120 due to the angle is caused by the deflector 140. Vortex and turbulence increase gas transmission efficiency.

The first pipe body 110 is further provided with a second air inlet 121 at an end away from the air outlet. The deflector 140 is disposed at a side of the intersection of the first pipe body 110 and the second pipe body 120 near the air outlet, and is at the first air inlet 111. When the second air inlet 121 flows toward the air outlet at the same time, the gas is rectified by the deflector 140 to ensure the stability of the gas and reduce the loss of the flow energy. It should be noted that, in other specific embodiments, the first The tubular body 110 can also be in direct communication with the second tubular body 120.

According to the characteristics of the airflow, in order to reduce the possibility of occurrence of the vortex, in the present embodiment, the deflector 140 is disposed along the longitudinal direction of the first tubular body 110. The airflow of the second pipe body 120 into the first pipe body 110 flows from both sides of the deflector 140 to the air outlet, and is rectified by the deflector 140 to make each branch flow relatively stable, and the gas flow rate is relatively uniform, thereby obtaining a stable airflow. . It should be noted that, in other specific embodiments, the deflector 140 and the first tubular body 110 may have a certain angle of inclination according to actual needs.

Further, since the diameter of the first pipe body 110 is generally large, in the embodiment, the baffle 140 includes three, and the three baffles 140 are in the process of gas transmission, and simultaneously flow to the second pipe body 110 to the second. The gas of the pipe body 120 is shunted to avoid the generation of turbulence and vortices, and to ensure the stability of the airflow. In order to make the flow energy loss small, the three baffles 140 are arranged in parallel, and the adjacent baffles 140 are equally spaced. In addition, the distance between the side baffles 140 and the pipe wall of the first pipe body 110 is equal to the distance between the adjacent baffles 140. It should be noted that, in actual use, since the diameters of the first pipe body 110 and the second pipe body 120 are changed, the number of the baffles 140 can be adjusted correspondingly. If the first pipe body 110 and the second pipe body 120 have a large diameter, four or more baffles 140 may be disposed, and the spacing between the adjacent baffles 140 may be appropriately adjusted, if the first pipe body 110 and the first pipe body 110 The second pipe body 120 has a small diameter, and it is also possible to provide only two baffles 140.

In this embodiment, since the three baffles 140 are disposed in parallel, the spacing between the adjacent baffles 140 is the same. In addition, the distance between the side baffles 140 and the pipe wall of the first pipe body 110 is equal to the distance between the adjacent baffles 140. When the diameters of the first pipe body 110 and the second pipe body 120 are the same, the spacing between the adjacent baffles 140 is one quarter of the diameter of the first pipe body 110. By this arrangement, a more stable flow rate is obtained and the loss of gas flow energy in the duct 100 is reduced.

The length of the three baffles 140 in the direction close to the second pipe body 120 is sequentially decreased, that is, the length of the baffle 140 near the side of the second pipe body 120 is the smallest. Referring to FIG. 3, the gas is in the air duct 100. The schematic diagram of the inner flow is set in such a manner that the lengths of the three baffles 140 in the direction of the second pipe body 120 are sequentially decreased, so that the flow rate of each branch flowing through the deflector 140 is relatively stable, and the laminar flow is quickly restored, thereby avoiding Turbulence and vortices appear again on the side of the deflector 140 near the air outlet to ensure air supply efficiency. It should be noted that, in actual use, according to the angle between the first pipe body 110 and the second pipe body 120, the length of the deflector 140 can be appropriately adjusted.

Further, in order to avoid turbulence and vortex from appearing again on the side of the baffle 140 near the air outlet, each of the rectified sub-flows should be aligned with the longitudinal direction of the first pipe 110. Therefore, in this embodiment, the baffle The end of the 140 near the air outlet remains flush. The gas holding through the deflector 140 is maintained in the same direction as the length of the first pipe body 110, and a stable airflow is obtained. The distance between the end of the baffle 140 near the air outlet and the inflection point at the junction of the first pipe body 110 and the second pipe body 120 is one fifth of the diameter of the first pipe body 110. It should be noted that, in other specific embodiments, according to actual use, the distance between the end of the air deflector 140 near the air outlet and the turning point of the first pipe body 110 and the second pipe body 120 may be appropriately adjusted, such as the first The tube body 110 has a quarter of the diameter and the like.

Optionally, referring to FIG. 4, the deflector 140 defines a flow guiding groove 141 in the longitudinal direction of the first pipe body 110, and the flow regulating plate 140 is used to increase the rectifying effect of the deflector 140 without increasing the length of the deflector 140. In this case, the flow guiding effect of the deflector 140 on the gas entering the second pipe body 120 is increased, the generation of turbulence and vortex is avoided, and the stability of the airflow is ensured. It should be noted that, in other specific embodiments, the above-mentioned guide groove 141 may not be provided, or the above-mentioned guide groove 141 may be formed on a part of the deflector 140 according to actual needs.

According to actual needs, in the present embodiment, the air outlet includes a first air outlet 131 and a second air outlet 133. Since the centrifugal fan connected to the air duct 100 usually has two air inlet boxes, the air outlet is provided at the air outlet. The first air outlet 131 and the second air outlet 133 are included. The first air outlet 131 and the second air outlet 133 are respectively connected to the two air inlets. Due to the action of the deflector 140, the air outlets of the first air outlet 131 and the second air outlet 133 are evenly distributed, which can ensure a good follow-up. The work of the centrifugal fan. It should be noted that, in other specific embodiments, the air outlet can be designed into other structures according to the connection device of the air duct 100.

A duct 100 in this embodiment works like this:

The gas enters the air duct 100 through the first air inlet 111 and the second air inlet 121, and is rectified by the deflector 140 at the intersection of the first tube 110 and the second tube 120 to ensure gas stability and avoid Turbulence and vortices are generated and the loss of flow energy is reduced. The gas passing through the deflector 140 is quickly restored to the laminar flow, and then flows through the first duct body 110 through the first air outlet 131 and the second air outlet 133 into the air intake box of the centrifugal fan, through the first air outlet 131 and the second The air outlet 133 has a uniform air output, which can well ensure the operation of the subsequent centrifugal fan.

The air duct 100 in this embodiment has a good ventilation effect, avoids the generation of turbulence and vortices, and has a uniform airflow.

A fan system includes a centrifugal fan and the duct 100 described above. The air outlet of the air duct 100 is connected with the centrifugal fan to provide a stable and uniform air volume for the centrifugal fan. The fan system has high efficiency and low energy loss.

The above description is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims (10)

A duct characterized by: The air duct includes a first tube body and a second tube body that are connected to each other and are not collinear; a baffle is disposed at a position where the second tube body communicates with the first tube body; the first tube body is away from the first tube body One end of the second pipe body is an air outlet; and one end of the second pipe body away from the first pipe body is a first air inlet. A duct according to claim 1 wherein: The baffle is disposed along a length direction of the first pipe body. A duct according to claim 2, wherein: The baffle comprises three; three of the baffles are arranged in parallel; the adjacent baffles are equally spaced apart. A duct according to claim 3, wherein: The first pipe body and the second pipe body have the same diameter; the spacing between adjacent baffles is one quarter of the diameter of the first pipe body. A duct according to claim 3, wherein: The three baffles are successively reduced in length in the direction of the second pipe body. A duct according to claim 5, wherein: The deflector is flush with an end of the air outlet. A duct according to claim 1 wherein: The deflector is provided with a flow guiding groove in the longitudinal direction of the first pipe body. A duct according to claim 1 wherein: The air outlet includes a first air outlet and a second air outlet having the same diameter. A duct according to any one of claims 1-8, characterized in that: The first pipe body further has a second air inlet opening away from the air outlet; the baffle is disposed at a side of the intersection of the first pipe body and the second pipe body near the air outlet. A fan system characterized by: The fan system includes a centrifugal fan and the air duct of any one of the preceding claims 1-9; the duct air outlet is in communication with the centrifugal fan.

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