An air outlet pipe assembly of a ventilator

Abstract

The application relates to the technical field of ventilators, and particularly provides an air outlet pipe assembly of a ventilator, which comprises a first air pipe, a second air pipe and a plurality of air pipes, the air inlet end of the first air pipe is connected with the air outlet end of the ventilator, the air inlet end of the air pipe is arranged on the pipe wall of the first air pipe and is connected with the outside, the air outlet end of the air pipe is connected with the second air pipe, the first air pipe is sleeved on the second air pipe, and an air flow channel is formed between the first air pipe and the second air pipe. The compressed air is sprayed out from the pipe opening of the first air pipe through the driving of the ventilator. Since the air flow channel formed between the first air pipe and the second air pipe has a small width, the air pressure of the compressed air sprayed out after passing through the air flow channel is increased. The air pipes are connected on the second air pipe, the air outside can enter the inside of the second air pipe through the air pipes, the negative pressure generated in the second air pipe is effectively offset, and the output air pressure of the ventilator is improved.

Description

Technical Field

[0001] This application relates to the field of ventilation fan technology, and more particularly to a ventilation fan outlet duct assembly. Background Technology

[0002] Currently, axial flow fans are commonly used for ventilation during tunnel construction. Axial flow fans are characterized by large air volume output, but low output air pressure and short air delivery distance, which cannot meet the needs of long-distance tunnel construction. Existing air outlet ducts are generally straight pipes with open ends, one end connected to the air outlet of the axial flow fan and the other end serving as the air outlet. The air output by the axial flow fan cannot be pressurized again after passing through the existing air outlet duct. Therefore, to increase the air pressure, the only current solutions are to increase the fan power or add multiple axial flow fans, but this also increases the power consumption, leading to higher construction and operating costs.

[0003] Therefore, existing technologies have defects and shortcomings, and need further improvement and development. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of this application is to provide an air outlet duct assembly for a ventilator, which aims to solve the problem of low output air pressure of the ventilator in the prior art.

[0005] The technical solution adopted by this application to solve the technical problem is as follows: an air outlet duct assembly for a ventilator, comprising a first duct, a second duct, and several ventilation ducts, wherein the air inlet end of the ventilation duct is inserted through the duct wall of the first duct and connected to the outside, and the air outlet end of the ventilation duct is connected to the second duct, wherein the first duct is sleeved on the second duct, and an air flow channel is formed between the first duct and the second duct.

[0006] Optionally, one end of the second air duct is open, the other end of the second air duct is sealed, and a number of ventilation holes are provided on the side of the second air duct, with the air outlet end of the ventilation duct connected to the ventilation holes.

[0007] Optionally, an airflow guide is provided on the outer wall of the second duct, and the airflow guide is located in the airflow channel.

[0008] Optionally, the airflow guide includes a plurality of blades, which are arranged around the outer wall of the second duct, and a spiral air duct is formed between each two adjacent blades.

[0009] Optionally, the air outlet duct assembly further includes a three-way pipe, the air inlet end of which is connected to the air outlet end of the fan, and both air outlet ends of the three-way pipe are connected to the first air duct.

[0010] Optionally, a ventilation component is connected between two adjacent ventilation pipes.

[0011] Optionally, the air outlet duct assembly further includes a manifold, one end of which is open and the other end of which is provided with a sealing plate, and the air outlet end of the first air duct passes through the sealing plate.

[0012] Optionally, the blade is twisted with a twist angle of 70°-75°.

[0013] Optionally, the spacing between any two adjacent blades is 3cm-5cm.

[0014] Beneficial Effects: This application provides an air outlet duct assembly for a ventilator. Driven by the fan, compressed air is ejected from the opening of a first duct after passing through an airflow channel. The air outlet duct includes a first duct and a second duct nested together, forming a narrow airflow channel between them. This increases the air pressure of the compressed air ejected after passing through the airflow channel. Furthermore, a vent pipe is connected to the second duct and is open to the outside, allowing outside air to enter the interior of the second duct. This effectively counteracts the negative pressure generated in the second duct, significantly increasing the output air pressure of the ventilator. Attached Figure Description

[0015] Figure 1 This is a three-dimensional schematic diagram of the air outlet duct assembly provided in this application;

[0016] Figure 2 This is an exploded view of the air outlet duct assembly provided in this application;

[0017] Figure 3 This is a cross-sectional schematic diagram of the air outlet duct assembly provided in this application;

[0018] Figure 4 This is a three-dimensional schematic diagram of the second air duct provided in this application;

[0019] Figure 5 This is a first perspective view of some other embodiments in this application;

[0020] Figure 6 This is a second perspective view of some other embodiments in this application;

[0021] Figure 7 These are exploded schematic diagrams of some other embodiments in this application;

[0022] Explanation of reference numerals in the attached figures:

[0023] 1. First air duct; 2. Second air duct; 3. Ventilation duct; 4. Air flow channel; 5. Ventilation hole; 6. Blade; 7. Air duct; 8. T-joint; 9. Ventilation component; 10. Manifold; 11. Sealing plate; 12. Mounting hole. Detailed Implementation

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings of this application, are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings of this application are used to distinguish different objects, not to describe a particular order.

[0025] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0026] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0027] like Figures 1 to 3 As shown, an embodiment of this application provides an air outlet duct assembly for a ventilator, comprising a first duct 1, a second duct 2, and several ventilation pipes 3. The air inlet end of the first duct 1 is connected to the air outlet end of the ventilator. The air inlet end of each ventilation pipe 3 passes through the wall of the first duct 1 and is connected to the outside. The air outlet end of each ventilation pipe 3 is connected to the second duct 2. The first duct 1 is fitted onto the second duct 2, forming an airflow channel 4 between the first duct 1 and the second duct 2. Wherein, as... Figure 4 As shown, one end of the second air duct 2 is open, and the other end of the second air duct 2 is sealed. The side of the second air duct 2 is provided with two symmetrical vent holes 5, and the air outlet end of the air duct 3 is connected to the vent hole 5.

[0028] Furthermore, such as Figure 3As shown, the air outlet duct assembly has a two-layer design, with the first duct 1 fitted onto the second duct 2, forming an airflow channel 4 between them. When the fan is driven, compressed air passes sequentially through the inlet section of the first duct 1 and the airflow channel 4 before being ejected. Since the ratio of flow rate to cross-sectional area equals velocity, a smaller cross-sectional area results in a higher velocity. In this paper, velocity refers to wind speed. Therefore, the cross-section of the airflow channel 4 is designed to be smaller than that of the first duct 1. After the compressed air passes through the airflow channel 4, the wind speed increases, resulting in a corresponding increase in air pressure and a longer ejection distance. However, according to Bernoulli's principle, fluid energy is conserved. With a constant flow rate, a change in pipe diameter leads to a change in velocity. The velocity is directly proportional to the friction loss; a higher velocity results in greater loss. In other words, a change in pipe diameter leads to a change in pipe loss. When the fluid passes through a pipe with a larger diameter, the increased pipe loss results in a decrease in pressure at the end of the smaller diameter pipe. Therefore, it can be seen that when compressed air passes through the air inlet section of the first air duct 1 and the air flow channel 4 in sequence, the air pressure at the end of the air flow channel 4 will decrease because the cross-sectional diameter of the air inlet section of the first air duct 1 is larger than the cross-sectional diameter of the air flow channel 4, thus generating negative pressure. This will affect the compressed air that is injected forward. Therefore, the ventilation pipe 3 is connected to the second air duct 2. One end of the vent pipe 3 is connected to the side of the second air duct 2. The first air duct 1 has a mounting hole 12 on its wall. The other end of the vent pipe 3 passes through the mounting hole 12. The wall of the vent pipe 3 is sealed and fitted to the wall of the mounting hole 12, so that the vent pipe 3 is not connected to the first air duct 1 and avoids the assembly gap between the vent pipe 3 and the mounting hole 12, preventing air leakage and affecting the wind speed. At the same time, the other end of the vent pipe 3 is connected to the outside, allowing outside air to enter the interior of the second air duct 2 through the vent pipe and then flow through the end of the air flow channel 4, thereby effectively offsetting the negative pressure at the end of the air flow channel 4 and greatly improving the output air pressure.

[0029] like Figure 3 and Figure 4 As shown, in this embodiment, an airflow guide is provided on the outer wall of the second duct 2, and the airflow guide is located in the airflow channel 4. The airflow guide includes several blades 6, which are arranged around the outer wall of the second duct 2, and a spiral airflow channel 7 is formed between each two adjacent blades 6, so that the compressed air can form a rotating high-speed airflow after passing through the airflow channel 7, and then be stably sprayed to a distance.

[0030] like Figure 4As shown, in this embodiment, the blade 6 is twisted with a twist angle of 70°-75° to ensure that the air duct 7 formed between two adjacent blades 6 is spiral-shaped, so that the compressed air forms a rotating airflow after passing through the air duct 7, making the air outlet more stable; the distance between each pair of adjacent blades 6 is 3cm-5cm to ensure that there is enough gap between the two adjacent blades 6 to ensure the required air outlet volume.

[0031] like Figures 5 to 7 As shown, in some embodiments, two air outlet duct assemblies are connected to the output end of the fan via a three-way pipe 8. The air inlet end of the three-way pipe 8 is connected to the air outlet end of the fan, and both air outlet ends of the three-way pipe 8 are connected to a first air duct 1. By adding the three-way pipe 8, the number of first air ducts 1 on the air outlet duct assembly is increased to two. Each first air duct 1 is fitted with a corresponding second air duct 2, and each second air duct 2 is connected to a corresponding vent pipe 3. That is, two output nozzles are designed on the air outlet duct assembly, which increases the output air pressure while ensuring sufficient airflow.

[0032] like Figures 5 to 7 As shown, in some embodiments, a ventilation component 9, which is either curved or straight, is connected between each pair of adjacent vent pipes 3. This ventilation component 9 is one of the parts of a cylindrical pipe cut in half along its central axis, and its cross-section is arc-shaped. By providing the ventilation component 9, it serves two purposes: firstly, it provides ventilation, facilitating the introduction of outside air into the vent pipe 3; secondly, it strengthens and fixes the vent pipe 3, preventing it from breaking after prolonged exposure to compressed air jets.

[0033] like Figure 5 and Figure 6 As shown, in some embodiments, four first air ducts 1 are provided, and all four first air ducts 1 are connected to a manifold 10. One end of the manifold 10 is open, and the other end is fitted with a sealing plate 11. The air outlets of all four first air ducts 1 pass through the sealing plate 11. When the fan is driven, compressed air can be input into the four first air ducts 1 respectively, and finally, the compressed air is ejected from the outlets of the four first air ducts 1. By adding the manifold 10, the high-speed airflow ejected from the four first air ducts 1 can be gathered together, resulting in more uniform airflow.

[0034] Obviously, the embodiments described above are only some embodiments of this application, not all embodiments. The accompanying drawings show preferred embodiments of this application, but do not limit the patent scope of this application. This application can be implemented in many different forms; rather, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this application's specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the scope of patent protection of this application.

Claims

1. A duct assembly for a ventilator, characterized in that: It includes a first air duct (1), a second air duct (2) and at least one ventilation pipe (3). The air inlet end of the ventilation pipe (3) passes through the pipe wall of the first air duct (1) and is connected to the outside. The air outlet end of the ventilation pipe (3) is connected to the second air duct (2). The first air duct (1) is sleeved on the second air duct (2). An air flow channel (4) is formed between the first air duct (1) and the second air duct (2). One end of the second air duct (2) is open, and the other end of the second air duct (2) is sealed. The side of the second air duct (2) is provided with several ventilation holes (5). The air outlet of the ventilation pipe (3) is connected to the ventilation holes (5). An airflow guide is provided on the outer wall of the second air duct (2), and the airflow guide is located in the airflow channel (4); The airflow guide includes a plurality of blades (6), which are arranged around the outer wall of the second air duct (2), and a spiral air duct (7) is formed between each two adjacent blades (6). The air outlet duct assembly also includes a three-way pipe (8), the air inlet end of which is connected to the air outlet end of the fan, and both air outlet ends of the three-way pipe (8) are connected to the first air duct (1). The air outlet duct assembly also includes a manifold (10), one end of which is open and the other end of which is provided with a sealing plate (11), and the air outlet end of the first air duct (1) passes through the sealing plate (11).

2. The air outlet duct assembly of the ventilator according to claim 1, characterized in that: A ventilation component (9) is connected between two adjacent ventilation pipes (3).

3. The air outlet duct assembly of the ventilator according to claim 1, characterized in that: The blade (6) is twisted, with a twist angle of 70°-75°.

4. The air outlet duct assembly of the ventilator according to claim 1, characterized in that: The distance between any two adjacent blades (6) is 3cm-5cm.

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