Ventilation pipe and ventilation system with same

Abstract

The utility model relates to the technical field of fluid, in particular to a ventilation pipe and a ventilation system with the ventilation pipe. The ventilation pipe comprises a contraction section, a throat section and an expansion section which are sequentially connected, and the throat section is located between the contraction section and the expansion section. The ventilation pipe further comprises a guide pipe, one end of the guide pipe is arranged in the contraction section and faces the expansion section, and the other end of the guide pipe penetrates out of the wall body of the contraction section. By means of the mode, the air flow of the ventilation pipe can be increased, and when the ventilation pipe is applied to a seat, small airflow can drive large airflow to flow, so that the seat has a better ventilation effect, and rapid heat dissipation of the seat is facilitated.

Description

Technical Field

[0001] This application relates to the field of fluid technology, and more particularly to a ventilation duct and a ventilation system having the ventilation duct. Background Technology

[0002] With the improvement of production levels, automobiles, ships, trains, high-speed trains, airplanes, and other transportation devices have brought many conveniences to people's lives, work, and study, occupying an important position in people's travel. As people's living standards improve, their demands for travel comfort are becoming increasingly strong.

[0003] Most current seats use fans as the air source, blowing air onto side A of the seat or drawing air in from the side opposite you. Because the ventilation fans in traditional seats produce relatively small air volumes, and the air guiding or ducting structures within the seats are only designed to direct as much airflow as possible towards the seat or create negative pressure to draw air out, they do not significantly increase the airflow. Therefore, the overall ventilation effect is not ideal, and the seat cannot quickly dissipate heat. Utility Model Content

[0004] The embodiments of this application aim to provide a ventilation duct and a ventilation system having the ventilation duct, so as to at least improve the air guiding structure or air duct structure provided in the seat. However, the air guiding structure or air duct structure does not significantly increase the airflow, so the overall ventilation effect is not ideal and the seat cannot dissipate heat quickly.

[0005] In order to solve the above-mentioned technical problems, the embodiments of this application adopt the following technical solutions:

[0006] In a first aspect, embodiments of this application provide a ventilation duct, the ventilation duct comprising a constriction section, a throat section, and an expansion section connected in sequence, the throat section being located between the constriction section and the expansion section. The ventilation duct further includes a conduit, one end of which is disposed within the constriction section with its port facing the expansion section, and the other end of which extends through the wall of the constriction section.

[0007] In some embodiments, the conduit includes an inlet section and an outlet section, the inlet section being disposed in the wall of the constriction section, the outlet section communicating with the inlet section, the outlet section being located within the constriction section and its port facing the expansion section.

[0008] In some embodiments, the inlet section extends radially along the constriction section, and the conduit portion is curved to connect with the inlet section.

[0009] In some embodiments, the inlet section includes a narrowing portion, the inner diameter of which gradually decreases along the radial direction of the contraction section.

[0010] In some embodiments, the ejection section is parallel to the centerline of the ventilation duct.

[0011] In some embodiments, the ejection section coincides with the axis of the contraction section.

[0012] In some embodiments, the contraction rate of the contraction segment gradually decreases along the direction from the contraction segment toward the throat segment.

[0013] In some embodiments, the ventilation duct further includes a straight section, one end of which is connected to the end of the contraction section opposite to the throat section.

[0014] In some embodiments, the constriction segment, the throat segment, and the expansion segment extend along the same axis.

[0015] Secondly, embodiments of this application also provide a ventilation system, the ventilation system including the ventilation duct as described in any of the preceding claims.

[0016] In this embodiment of the ventilation duct, when the duct sprays gas from the constriction section towards the expansion section, a negative pressure can be generated in the constriction section, causing it to draw in more gas from the external environment. Therefore, the gas flow rate drawn in by the constriction section and the gas flow rate discharged by the expansion section are both much greater than the gas flow rate of the duct, thus increasing the gas flow rate of the ventilation duct. When applied to a seat, it can use a small airflow to drive a large airflow, resulting in better ventilation and facilitating rapid heat dissipation from the seat.

[0017] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and in order to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0018] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0019] Figure 1 This is an axial cross-sectional view of the ventilation duct according to an embodiment of this application;

[0020] Figure 2 This is a schematic diagram of the ventilation system according to an embodiment of this application;

[0021] Figure 3 yes Figure 2 A three-dimensional sectional view of the ventilation pad and ventilation duct;

[0022] Figure 4 yesFigure 2 A magnified view of a portion of the breathable interlayer.

[0023] The reference numerals in the detailed embodiments are as follows:

[0024] 100. Ventilation system;

[0025] 1. Ventilation pad; 11. Sealing sleeve; 111. First ventilation hole; 112. Second ventilation hole; 113. First layer; 114. Second layer; 12. Breathable partition; 121. Gas channel;

[0026] 2. Ventilation duct; 21. Contraction section; 22. Throat section; 23. Expansion section; 24. Conduit; 241. Inlet section; 2411. Narrowing section; 242. Ejection section; 243. Bend section; 25. Straight pipe section; 26. Connector;

[0027] 3. Gas source;

[0028] 4. Controller. Detailed Implementation

[0029] To facilitate understanding of this application, the following description, in conjunction with the accompanying drawings and specific embodiments, will provide a more detailed account. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or one or more intermediate elements may exist between them. When an element is described as being "connected to" another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them.

[0030] 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 is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0031] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0032] In the description of the embodiments of this application, the terms "first," "second," etc., are used to define components merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, these terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0033] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0034] Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0035] Example 1:

[0036] Please see Figure 1 This application provides a ventilation pipe 2, which is used to connect with an air source, so that air intake and air blowing can be realized at both ends of the ventilation pipe 2 respectively.

[0037] The ventilation duct 2 includes a contraction section 21, a throat section 22, and an expansion section 23 connected in sequence, with the throat section 22 located between the contraction section 21 and the expansion section 23. The ventilation duct 2 also includes a conduit 24, one end of which is disposed within the contraction section 21 with its port facing the expansion section 23, and the other end of which extends out of the wall of the contraction section 21.

[0038] When gas is introduced into the duct 24, the gas is ejected from the contraction section 21 towards the expansion section 23, drawing surrounding gas into the expansion section 23. This creates a negative pressure within the contraction section 21, causing ambient gas to be drawn in and discharged from the expansion section 23. Specifically, when the duct 24 ejects gas from the contraction section 21 towards the expansion section 23, it generates a negative pressure within the contraction section 21, causing it to draw in more gas from the environment. Consequently, the gas flow rate drawn in by the contraction section 21 and the gas flow rate discharged by the expansion section 23 are both significantly greater than the gas flow rate of the duct 24, thus increasing the gas flow rate of the ventilation pipe 2. When applied to a seat, this allows a small airflow to drive a large airflow, resulting in better ventilation and faster heat dissipation. Furthermore, it reduces the gas flow rate requirement of the ventilation pipe 2 on the duct 24, thereby appropriately reducing the gas output flow rate and velocity of the air source, reducing seat noise, and minimizing energy consumption of the air source.

[0039] The ventilation duct 2 can be made of plastic, metal, or other materials. When the ventilation duct 2 is made of plastic, it can be manufactured using 3D printing technology, which helps to reduce production costs.

[0040] In some embodiments, please refer to Figure 1 The contraction section 21, throat section 22, and expansion section 23 extend along the same axis. That is, the centerlines of the contraction section 21, throat section 22, and expansion section 23 coincide in pairs. When the gas passes through the contraction section 21, throat section 22, and expansion section 23, the gas does not need to go through bends, which helps to reduce the energy loss of the gas.

[0041] In some embodiments, please refer to Figure 1 and Figure 2 The contraction section 21, throat section 22, and expansion section 23 are all rotating bodies. When the gas passes through the contraction section 21, it contracts uniformly from all sides towards the axis of the contraction section 21; when the gas passes through the expansion section 23, it expands uniformly in a direction away from the axis of the expansion section 23, which helps to reduce airflow turbulence and reduce gas energy loss.

[0042] For the contraction segment 21 mentioned above, please refer to Figure 1 Along the direction from the contraction section 21 to the throat section 22, the contraction rate of the contraction section 21 gradually decreases. As the gas passes through the contraction section 21, its contraction rate gradually decreases, and then abruptly drops to zero as the gas passes through the throat section 22. By gradually decreasing the gas's contraction rate, the degree of this abrupt change can be reduced, thereby weakening the intensity of the vortex rings caused by this abrupt change in gas contraction rate. When the gas generates vortex rings within the ventilation duct 2, a significant amount of energy loss occurs; therefore, gradually decreasing the contraction rate of the contraction section 21 helps to reduce this energy loss.

[0043] In this embodiment of the application, the shrinkage rate of the shrinkage section 21 refers to the rate of change of the inner diameter of the shrinkage section 21, and the expansion rate of the expansion section 23 refers to the rate of change of the inner diameter of the expansion section 23.

[0044] Please refer to Figure 1 At the junction of contraction segment 21 and throat segment 22, the contraction rate of contraction segment 21 is zero, meaning the tangent at the junction of contraction segment 21 and throat segment 22 is parallel to the axis of contraction segment 21. Therefore, when the gas flows from contraction segment 21 to throat segment 22, the contraction rate of the gas theoretically does not change abruptly, thus minimizing the energy loss of the gas.

[0045] For the above-mentioned laryngeal segment 22, please refer to Figure 1 , Figure 1 The dotted line in the middle is the throat section 22. The length of the throat section 22 is close to zero, that is, after the gas flows out of the contraction section 21, it immediately enters the expansion section 23, which helps to shorten the length of the ventilation pipe 2.

[0046] In some embodiments, please refer to Figure 1 The length of the contraction section 21 is shorter than the length of the expansion section 23. The gas flows in the expansion section 23 for a longer time than it flows in the contraction section 21, which can generate a greater negative pressure in the contraction section 21 and increase the air intake of the ventilation pipe 2.

[0047] For the aforementioned expansion section 23, please refer to Figure 1 Along the throat 22 towards the expansion section 23, the expansion rate of the expansion section 23 first gradually increases and then remains constant. When the gas passes through the throat 22, the expansion rate of the gas is zero. Then, when the gas passes through the expansion section 23, the expansion rate of the gas abruptly becomes greater than zero. By gradually increasing the expansion rate of the expansion section 23 first, the degree of this abrupt change can be reduced, thereby weakening the intensity of the vortex ring caused by the abrupt change in the gas's expansion rate, which is beneficial for reducing the energy loss of the gas.

[0048] Please refer to Figure 1 At the junction of expansion section 23 and throat section 22, the expansion rate of expansion section 23 is zero, meaning the tangent at the junction is parallel to the axis of expansion section 23. Therefore, when the gas flows from throat section 22 to expansion section 23, the expansion rate theoretically does not change abruptly, thus minimizing energy loss.

[0049] In this process, the expansion rate of expansion section 23 first gradually increases and then remains constant. Therefore, when the gas passes through expansion section 23, the expansion rate of the gas does not change abruptly, which is beneficial to reducing the energy loss of the gas. Figure 1 In the middle, the solid line between the expansion segment 23 and the throat segment 22 is the boundary line between the segment where the expansion rate of the expansion segment 23 gradually increases and the segment where the expansion rate of the expansion segment 23 remains constant. It can be understood that the tangents of these two segments of the expansion segment 23 at the boundary line are parallel to each other.

[0050] For catheter 24 mentioned above, please refer to Figure 1 The conduit 24 includes an inlet section 241 and an outlet section 242. The inlet section 241 is located within the wall of the contraction section 21, and the outlet section 242 communicates with the inlet section 241. The outlet section 242 is located within the contraction section 21, and its port faces the expansion section 23. By placing the inlet section 241 within the wall of the contraction section 21, it is advantageous to separate the pipe connected to the inlet section 241 from the end of the contraction section 21 facing away from the expansion section 23, reducing interference with the communication between the contraction section 21 and the second vent 112. Furthermore, it reduces the volume occupied by the conduit 24 within the contraction section 21, allowing the contraction section 21 to draw in more gas.

[0051] In some embodiments, please refer to Figure 1The centerline of the ejector section 242 coincides with that of the converging section 21. That is, the ejector section 242 is positioned close to the centerline of the converging section 21, which helps to increase the air intake efficiency of the ventilation duct 2. Furthermore, the centerline of the ejector section 242 coincides with the centerline of the converging section 21 to further maximize the air intake efficiency of the ventilation duct 2.

[0052] In some embodiments, please refer to Figure 1 The ejection section 242 is parallel to the axis of the ventilation duct 2. Therefore, when the gas is ejected from the ejection section 242, the airflow direction is parallel to the axis of the ventilation duct 2, and the airflow ejected from the ejection section 242 does not need to change its flow direction within the expansion section 23, which helps to reduce the energy loss of the gas.

[0053] In some embodiments, please refer to Figure 1 The inlet section 241 extends radially along the constriction section 21, and the conduit 24 is partially curved to connect with the inlet section 241. Exemplarily, the conduit 24 also includes a curved section 243, which is a bend in the tube and connects the inlet section 241 to the outlet section 242. It is understood that since the angle between the axis of the inlet section 241 and the axis of the outlet section 242 is a right angle, direct entry of gas from the inlet section 241 into the outlet section 242 would result in a significant energy loss. By smoothly connecting the inlet section 241 and the outlet section 242 through the bend in the tube-shaped curved section 243, the energy loss of the gas can be reduced.

[0054] Furthermore, the curved section 243 smoothly connects the inlet section 241 and the outlet section 242. This smooth connection means that the tangents to the centerlines at both ends of the curved section 243 are parallel to the centerlines of the inlet section 241 and the outlet section 242, respectively, and the centerline of the curved section 243 is a curve. For example, the centerline of the curved section 243 can be an arc, a parabola, or an elliptical arc. Preferably, the centerline of the curved section 243 is an arc to minimize gas energy loss.

[0055] In some embodiments, please refer to Figure 1 The inlet section 241 includes a narrowing section 2411, the inner diameter of which gradually decreases along the radial direction of the contraction section 21. It can be understood that the airflow flows in the inlet section 241 towards the axis of the contraction section 21, thus causing the inner diameter of the narrowing section 2411 to gradually decrease in the direction towards the axis of the contraction section 21. By providing the narrowing section 2411, the cross-sectional area through which the gas flows is reduced, thereby increasing the airflow velocity.

[0056] In some embodiments, please refer to Figure 2The ventilation duct 2 also includes a straight pipe section 25. One end of the straight pipe section 25 is used to connect to external equipment, and the other end of the straight pipe section 25 is connected to the end of the contraction section 21 away from the throat section 22. The inner diameter of the straight pipe section 25 is equal to the inner diameter of the end of the contraction section 21 away from the throat section 22. By providing the straight pipe section 25, it is convenient for the ventilation duct 2 to connect to external equipment. The straight pipe section 25 can be partially inserted into the connection hole of the external equipment, enhancing the airtightness of the connection between the ventilation duct 2 and the external equipment.

[0057] In some embodiments, please refer to Figure 2 The ventilation duct 2 also includes a connector 26, which is located on the outer wall of the contraction section 21 and communicates with the conduit 24. The connector 26 is used to connect the duct, facilitating the connection between the ventilation duct 2 and the duct.

[0058] Example 2:

[0059] As one application scenario for the aforementioned ventilation duct 2, please refer to Figure 3 This application provides a ventilation system 100, which includes a ventilation pad 1, a ventilation pipe 2, an air source 3, and a controller 4. The ventilation pad 1 is installed inside a seat to blow or draw air into the seat for heat dissipation. The ventilation pipe 2 is connected to the air source 3. When the air source 3 supplies gas to the ventilation pipe 2, a negative pressure is created within the ventilation pipe 2, allowing one end of the ventilation pipe 2 to draw in gas and the other end to discharge gas. One end of the ventilation pipe 2 is connected to the ventilation pad 1, enabling blowing or drawing air into the ventilation pad 1. The air source 3 provides a continuous airflow, such as an air compressor, which provides compressed air to supply the ventilation pipe 2. The controller 4 is connected to the air source 3 and the ventilation pipe 2. The controller 4 controls the flow of air between the air source 3 and the ventilation pipe 2, i.e., controls whether gas is supplied to the ventilation pipe 2. For example, the controller 4 is located on the pipe between the air source 3 and the ventilation pipe 2, and the controller 4 can be a solenoid valve or include multiple solenoid valves.

[0060] In this embodiment of the application, the controller 4 is connected to the conduit 24. The controller 4 is used to control the opening and closing of the gas path between the gas source 3 and the conduit 24. For example, the controller 4 is set on the pipeline between the gas source 3 and the conduit 24.

[0061] It should be noted that the ventilation system 100 mentioned above also includes a ventilation pad 1, an air source 3, and a controller 4. This is only an example to illustrate the application scenario of the ventilation duct 2. The ventilation system 100 may also not include the ventilation pad 1, the air source 3, and the controller 4, or the ventilation system 100 may include another airflow distribution device, airflow input device, or airflow output device.

[0062] For the ventilation pad 1 mentioned above, please refer to Figure 3 and Figure 4The ventilation pad 1 includes a sealing sleeve 11 and a breathable partition 12 enclosed within the sealing sleeve 11. One side of the sealing sleeve 11 has multiple first ventilation holes 111, and the other side has multiple second ventilation holes 112. One end of the ventilation pipe 2 communicates with the second ventilation holes 112. Alternatively, there may be only one second ventilation hole 112, meaning the sealing sleeve 11 has at least one second ventilation hole 112. The breathable partition 12 is mesh-like, allowing airflow to pass through it and providing some support to prevent the fluid passage from being blocked when the sealing sleeve 11 is under pressure.

[0063] The first ventilation hole 111 faces the seating space of the seat, which is used for passenger seating. When the first ventilation hole 111 inhales or blows air, it can remove air from the surrounding area of ​​the passenger, thereby dissipating heat from the seating space. The ventilation pad 1 is located inside the seat or is part of the seat. When the first ventilation hole 111 inhales or blows air, it also dissipates heat from the seat.

[0064] The seating space includes not only the semi-enclosed space formed by the seat and backrest, but also the space in which the passenger moves while seated. This includes, for example, the space for the passenger's legs and surrounding area, the space for arm movement, and the space for head movement.

[0065] The multiple first ventilation holes 111 may include multiple first ventilation holes 111 of different shapes and sizes, thereby providing different intake and exhaust effects. For example, one of the first ventilation holes 111 on the sealing sleeve 11 may be circular, another may be rectangular, and yet another may be triangular, etc. For example, the sealing sleeve 11 may have multiple circular first ventilation holes 111, one of which has a diameter of 1 cm, another has a diameter of 2 cm, and yet another has a diameter of 3 cm, etc.

[0066] In some embodiments, the number of first ventilation holes 111 is greater than the number of second ventilation holes 112. That is, the ventilation pad 1 has a diversion function, which helps to form a larger number of air intake or air outlets in the seat, thereby improving the uniformity of air blowing or inhaling from the seat to the passenger.

[0067] The second ventilation hole 112 is positioned opposite to the first ventilation hole 111, meaning that the first ventilation hole 111 and the second ventilation hole 112 are located on opposite sides of the ventilation pad 1, for example, on opposite sides of the ventilation pad 1 along its thickness direction. This allows gas to pass through the ventilation pad 1 in one direction, which helps reduce the resistance encountered by the gas within the ventilation pad 1, reduces gas energy loss, and improves the heat dissipation effect on the seat. Furthermore, in this embodiment, the first ventilation hole 111 and the second ventilation hole 112 are located on opposite sides of the ventilation pad 1 along its thickness direction, which helps to shorten the path length of the gas flow within the ventilation pad 1 and reduce gas energy loss.

[0068] When the ventilation pad 1 has multiple second ventilation holes 112, the ventilation system 100 includes multiple ventilation pipes 2. The number of ventilation pipes 2 is equal to the number of second ventilation holes 112, and each ventilation pipe 2 is connected to one second ventilation hole 112. At this time, the controller 4 is connected to multiple ventilation pipes 2, and the controller 4 is used to independently control the opening and closing of the air passage between the air source 3 and any one of the ventilation pipes 2. This allows control over the airflow rate of the ventilation pad 1 for intake or exhaust, and control over the heat dissipation intensity of the seat. The ventilation pipes 2 can have various models, with different models having different shapes and / or sizes, resulting in different intake and exhaust effects. Multiple ventilation pipes 2 connected to the same ventilation pad 1 can include various models, meaning that one ventilation pad 1 is equipped with multiple models of ventilation pipes 2.

[0069] The ventilation pad 1 is flat, making it easy to cover the seat frame or be installed inside the seat, minimizing its impact on seat dimensions. The ventilation pad 1 can be used directly as a seat cover, reducing the resistance to ventilation caused by the original seat cover and allowing for a smaller seat size. Optionally, the ventilation pad 1 is rectangular. Optionally, the ventilation pad 1 is adapted to the shape of the seat cover, thus directly replacing the original seat cover.

[0070] The sealing sleeve 11 is elastic or plastic, and can deform when a passenger sits on the seat and applies pressure to the sealing sleeve 11, thereby improving passenger comfort. The sealing sleeve 11 can be made of genuine leather, artificial leather, plastic, rubber, silicone, etc.

[0071] In some embodiments, please refer to Figure 3 The sealing sleeve 11 includes a first layer 113 and a second layer 114. The first layer 113 is disposed within the second layer 114. The first layer 113 is used to form a seal, and the second layer 114 is used to contact the passenger, thereby improving the passenger's riding comfort and enhancing the airtightness of the sealing sleeve 11. Optionally, the first layer 113 is made of a material with good airtightness, such as rubber or silicone, and the second layer 114 is made of a skin-friendly and wear-resistant material, such as genuine leather or artificial leather.

[0072] It should be noted that when air is drawn in or blown into the sealing sleeve 11, the sealing sleeve 11 will expand or contract due to changes in internal air pressure, affecting the shape of the seat and the comfort of the passenger. The breathable layer 12, supported within the ventilation pad 1, can support the sealing sleeve 11 when air is drawn in, mitigating the contraction problem. The breathable layer 12 can be bonded to the inner wall of the sealing sleeve 11, and when air is blown into the sealing sleeve 11, it can hold the sealing sleeve 11 in place, mitigating its expansion problem. Optionally, the breathable layer 12 can be made of plastic, metal, or other materials, possessing a certain strength and elasticity to address the issues of the ventilation pad 1 easily collapsing or becoming too rigid, which can lead to poor seat comfort.

[0073] The breathable spacer 12 is adapted to the shape of the inner cavity of the sealing sleeve 11. For example, when the sealing sleeve 11 is a rectangular sheet, the breathable spacer 12 is also a rectangular sheet. Please refer to [link / reference]. ​ The breathable barrier 12 has gas channels 121 along its thickness direction. Multiple gas channels 121 are arranged at intervals along the length and width directions of the breathable barrier 12, so that gas can pass through the breathable barrier 12 along its thickness direction, reducing the obstruction of the breathable barrier 12 to the gas and reducing gas energy loss.

[0074] In this design, a gap exists between the breathable partition 12 and the inner wall of the sealing sleeve 11 along the thickness direction of the breathable partition 12, allowing gas to flow in a direction perpendicular to the thickness of the breathable partition 12. It is understood that the first ventilation hole 111 and the second ventilation hole 112 may not be directly aligned along the thickness direction of the ventilation pad 1. Therefore, gas needs to flow a certain distance perpendicular to the thickness of the ventilation pad 1 before it can flow from one of the first ventilation hole 111 to the other. By providing a gap between the breathable partition 12 and the inner wall of the sealing sleeve 11, a channel perpendicular to the thickness direction of the ventilation pad 1 can be formed. This not only allows gas flow between the first ventilation hole 111 and the second ventilation hole 112 but also makes the suction or blowing intensity of the multiple first ventilation holes 111 more uniform. In some other embodiments, the breathable partition 12 also has a gas channel 121 perpendicular to its thickness direction.

[0075] In some embodiments, please refer to ​ The end of the contraction section 21 opposite to the throat section 22 is connected to the second ventilation hole 112. Since the contraction section 21 is connected to the first ventilation hole 111 through the second ventilation hole 112, it draws away the air near the first ventilation hole 111, that is, it draws away the air from the seating space, thus dissipating heat from the seating space and the seat. Dissipating heat by drawing in air, compared to blowing air, is beneficial for improving passenger comfort.

[0076] The ventilation duct 2 and the ventilation system 100 having the ventilation duct 2 in this embodiment of the application, when the duct 24 of the ventilation duct 2 sprays gas from the contraction section 21 toward the expansion section 23, can generate negative pressure in the contraction section 21, so that the contraction section 21 draws in more gas from the external environment. Therefore, the gas flow rate drawn in by the contraction section 21 and the gas flow rate discharged by the expansion section 23 are both much greater than the gas flow rate of the duct 24, i.e., increasing the gas flow rate of the ventilation duct 2. When applied to a seat, it can drive a large airflow with a small airflow, giving the seat better ventilation and facilitating rapid heat dissipation. Furthermore, it can reduce the gas flow rate requirement of the ventilation duct 2 on the duct 24, thus appropriately reducing the gas output flow rate and gas velocity of the air source, reducing seat noise, and reducing energy consumption.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them; under the concept of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of this application as described above, which are not provided in detail for the sake of brevity; although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A ventilation duct, characterized in that, It includes a constricting segment, a throat segment, and a dilating segment connected in sequence, wherein the throat segment is located between the constricting segment and the dilating segment; The ventilation duct also includes a conduit, one end of which is disposed within the contraction section with its port facing the expansion section, and the other end of which extends through the wall of the contraction section.

2. The ventilation duct according to claim 1, characterized in that, The conduit includes an inlet section and an outlet section. The inlet section is disposed in the wall of the contraction section, and the outlet section communicates with the inlet section. The outlet section is located within the contraction section and its port faces the expansion section.

3. The ventilation duct according to claim 2, characterized in that, The inlet section extends radially along the constriction section, and the conduit portion is curved to connect with the inlet section.

4. The ventilation duct according to claim 3, characterized in that, The inlet section includes a narrowing section, the inner diameter of which gradually decreases along the radial direction of the contraction section.

5. The ventilation duct according to claim 2, characterized in that, The ejection section is parallel to the centerline of the ventilation duct.

6. The ventilation duct according to claim 2, characterized in that, The ejection section coincides with the axis of the contraction section.

7. The ventilation duct according to claim 1, characterized in that, Along the direction from the constricted segment toward the throat segment, the contraction rate of the constricted segment gradually decreases.

8. The ventilation duct according to claim 1, characterized in that, The ventilation duct also includes a straight section, one end of which is connected to the end of the contraction section opposite to the throat section.

9. The ventilation duct according to any one of claims 1 to 8, characterized in that, The contraction segment, the throat segment, and the expansion segment extend along the same axis.

10. A ventilation system, characterized in that, Includes the ventilation duct as described in any one of claims 1 to 9.

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