Gas injection apparatus, ventilation system, seat and blower
Patent Information
- Application Number
- PCT/CN2026/085909
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2025-03-27
- Filing Date
- 2026-03-25
- Publication Date
- 2026-10-01
Smart Images
Figure CN2026085909_01102026_PF_FP_ABST
Abstract
Description
Gas injection device, ventilation system, seat and hair dryer
[0001] Cross-reference of related applications
[0002] This application claims priority to Chinese Patent Application No. 202510375373.5, filed on March 27, 2025, entitled “Gas Injection Device, Ventilation System, Seat and Hair Blower”, the entire contents of which are incorporated herein by reference. Technical Field
[0003] This application relates to the field of fluid technology, and more particularly to a gas injection device, a ventilation system, a seat, and a blower. Background Technology
[0004] 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.
[0005] One important factor affecting ride comfort is the seat's heat dissipation. Most seat technologies use fans as an air source, dissipating heat by blowing or drawing air into the seat. However, the airflow from fans is limited, resulting in a slow and ineffective cooling effect, failing to quickly lower the seat temperature. Summary of the Invention
[0006] The embodiments of this application aim to provide a gas injection device, a ventilation system, a seat, and a blower, so as to at least improve the problems of poor heat dissipation, low heat dissipation efficiency, and inability to cool down the seat quickly.
[0007] In order to solve the above-mentioned technical problems, the embodiments of this application adopt the following technical solutions:
[0008] In a first aspect, embodiments of this application provide a gas injection device, the gas injection device including an outer tube and an inner tube located inside the outer tube, the inner diameter of one end of the inner tube being larger than the inner diameter of the other end of the inner tube, one end of the outer tube being sealed to the large end of the inner tube, a gas chamber being formed between a portion of the inner wall of the outer tube and the inner tube, another portion of the inner wall of the outer tube having a Coanda surface, a slit being formed between the Coanda surface and the outer wall corresponding to the small end of the inner tube, the slit allowing fluid communication between the gas chamber and the outside of the outer tube, the side wall of the outer tube having at least one first fluid channel for introducing a fluid source and at least one second fluid channel for introducing a fluid source, the first fluid channel being fluidly communicated with one end of a provided conduit, the other end of the conduit passing through the side wall of the inner tube and extending to the small end of the inner tube or exiting the inner tube, the second fluid channel being fluidly communicated with the gas chamber.
[0009] In some embodiments, the outer tube includes a constriction section, a throat section, and an extension section connected sequentially along a first direction, wherein the constriction section forms the air chamber with the inner tube, and the portion of the inner wall of the constriction section near the throat section has a Coanda surface.
[0010] In some embodiments, the extension is tapered, and the small end of the extension engages with the throat segment.
[0011] In some embodiments, the air chamber is annular and surrounds the conduit.
[0012] In some embodiments, the port of the conduit located inside the inner tube ejects in a direction parallel to the first direction.
[0013] In some embodiments, the inner diameter of the inner tube gradually decreases from the large end to the slit, while the inner diameter of the inner wall of the portion of the inner tube corresponding to the slit gradually increases.
[0014] Secondly, embodiments of this application provide a ventilation system, the ventilation system including an air source, a ventilation pad, a controller, and a gas injection device; the air source is in fluid communication with the first fluid channel and the second fluid channel respectively; the ventilation pad includes a sealing sleeve and a breathable partition, one side of the sealing sleeve is provided with a plurality of first ventilation holes, the other side of the sealing sleeve is provided with a second ventilation hole, and the breathable partition is disposed inside the sealing sleeve; the port of the outer tube that is sealed to the inner tube is connected to the second ventilation hole; the controller is disposed in the air passage between the air source and the first fluid channel and the second fluid channel, and the controller is used to independently control the opening and closing of the air passage between the air source and the first fluid channel and the second fluid channel respectively.
[0015] In some embodiments, the ventilation system includes a plurality of gas injection devices, the sealing sleeve is provided with a plurality of second ventilation holes, and the outer tubes of the plurality of gas injection devices are connected one-to-one to the plurality of second ventilation holes.
[0016] Thirdly, this application provides a seat, which includes the ventilation system described above. At least one of the seat, backrest, armrest, leg and headrest of the seat is provided with the ventilation pad, and the first ventilation hole faces the seating space of the seat.
[0017] Fourthly, embodiments of this application provide a hair dryer, which includes the gas jetting device described above.
[0018] In the gas injection device of this application embodiment, when gas is introduced into the conduit and ejected from the outer tube, a negative pressure can be generated in the outer tube on the side of the conduit port opposite to the ejection direction of the conduit port, so that the outer tube draws in gas, and the gas injection device drives a large airflow with a small airflow, that is, generates a larger output airflow with a smaller input airflow, producing an airflow multiplication effect.
[0019] The airflow ejected from the duct is a turbulent fluid with a high velocity in the middle and a low velocity at the edges. The airflow ejected from the slit will superimpose with the airflow ejected from the duct. If the airflow ejected from the slit comes into contact with the edge of the airflow ejected from the duct, it will increase the velocity at the edge of the airflow ejected from the duct. This will change the airflow ejected from the duct from a turbulent airflow with a low velocity at the edge to an airflow with a more uniform overall velocity. This will make the airflow ejected from the duct closer to a laminar flow state and reduce the noise of the airflow ejected from the duct.
[0020] Furthermore, the airflow ejected from the slit increases the overall velocity of the airflow ejected from the duct, enhances the negative pressure generated by the airflow ejected from the duct inside the outer tube, strengthens the effect of the gas injection device in driving a large airflow with a small airflow, and enhances the airflow multiplication effect.
[0021] By creating a slit between the Coanda surface and the outer wall of the inner tube, meaning the Coanda surface at least partially defines the slit, when gas is blown out through the slit to form an airflow, at least a portion of the airflow passes over the Coanda surface and generates the Coanda effect. The airflow then flows along the inner wall of the outer tube. As the airflow flows along the inner wall of the outer tube, it carries away gas from the side of the outer tube away from the inner wall, causing a decrease in air pressure near the outer tube's axis. This increases the negative pressure of the gas near the outer tube's axis, increasing the amount of gas drawn into the outer tube from the external environment and enhancing the airflow multiplication effect.
[0022] The ventilation system of this application embodiment includes a gas injection device, which can generate a larger output airflow with a smaller input airflow, thereby enhancing the ventilation effect of the ventilation system.
[0023] The seat in this embodiment includes a ventilation system, which enhances ventilation and improves the problems of poor heat dissipation, low heat dissipation efficiency, and inability to cool the seat quickly.
[0024] The hair dryer of this application embodiment includes a gas jetting device, which can generate a larger output airflow with a smaller input airflow, thereby increasing the output airflow of the hair dryer.
[0025] The above description is merely 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 to make the above and other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below. Attached Figure Description
[0026] 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.
[0027] Figure 1 is a schematic diagram of the structure of a gas injection device according to an embodiment of this application;
[0028] Figure 2 is an axial cross-sectional view of the gas injection device according to an embodiment of this application;
[0029] Figure 3 is a schematic diagram of the superposition of the airflow ejected from the slit and the airflow ejected from the duct in the gas injection device of this application embodiment;
[0030] Figure 4 is a structural schematic diagram of the ventilation system according to an embodiment of this application;
[0031] Figure 5 is a three-dimensional sectional view of the ventilation pad in Figure 4.
[0032] The reference numerals in the detailed embodiments are as follows:
[0033] 100. Ventilation system;
[0034] 1. Gas injection device;
[0035] 11. Outer tube; 111. Coanda surface; 112. First fluid channel; 113. Second fluid channel; 114. Contraction section; 115. Throat section; 116. Extension section;
[0036] 12. Inner tube; 121. Mating surface;
[0037] 13. Conduit; 131. Introducing section; 1311. Constriction section; 132. Ejection section; 133. Curved section;
[0038] a. Air chamber; b. Slit; 14. First connector; 15. Second connector;
[0039] 2. Ventilation pad; 21. Sealing sleeve; 211. First ventilation hole; 212. Second ventilation hole; 22. Breathable partition; 221. Gas passage;
[0040] 3. Gas source;
[0041] 4. Controller;
[0042] X, the first direction. Embodiments of the present invention
[0043] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. 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 intervening 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 intervening elements may exist between them. It should be noted that, unless otherwise specified, the various features in the embodiments of this application can be combined with each other, all within the scope of protection of this application. Furthermore, although functional modules are divided in the device schematic diagram and a logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different module division or in a different order than that shown in the device schematic diagram or the flowchart.
[0044] 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.
[0045] 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.
[0046] 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.
[0047] 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.
[0048] 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.
[0049] Please refer to Figure 1. This application embodiment provides a gas injection device 1. The gas injection device 1 is used to communicate with a gas source 3 in fluid communication, and gas intake and blowing are realized at both ends of the gas injection device 1, respectively.
[0050] Please refer to Figures 1 and 2. The gas injection device 1 includes an outer pipe 11, an inner pipe 12, and a conduit 13. The inner tube 12 is located inside the outer tube 11. The inner diameter of one end of the inner tube 12 is larger than the inner diameter of the other end. One end of the outer tube 11 is sealed to the large end of the inner tube 12. A portion of the inner wall of the outer tube 11 and the inner tube 12 enclose a chamber a. Another portion of the inner wall of the outer tube 11 has a Coanda surface 111. A slit b is formed between the Coanda surface 111 and the outer wall corresponding to the small end of the inner tube 12. The slit b allows the air chamber a to be fluidly connected to the outside of the outer tube 11. The side wall of the outer tube 11 has at least one first fluid channel 112 for introducing a fluid source and at least one second fluid channel 113 for introducing a fluid source. The first fluid channel 112 is fluidly connected to one end of a conduit 13. The other end of the conduit 13 passes through the side wall of the inner tube 12 and extends to the small end of the inner tube 12 or exits the inner tube 12. The second fluid channel 113 is fluidly connected to the air chamber a.
[0051] Please refer to Figures 1 and 2 for the outer tube 11 mentioned above. The outer tube 11 is in the shape of a tube, such as a round tube or a square tube, and has two ports.
[0052] Referring to Figures 1 and 2, the inner tube 12 is tubular, such as a round or square tube, and has two ends. The first end of the inner tube 12 is sealed to the first end of the outer tube 11. The second end of the inner tube 12 extends toward the second end of the outer tube 11, and a gap exists between the inner tube 12 and the outer tube 11, thereby forming an air chamber a between the inner tube 12 and the outer tube 11, and a slit b is formed between the inner walls of the inner tube 12 and the outer tube 11. Exemplarily, the inner tube 12 is recessed away from the outer tube 11, and / or the outer tube 11 is recessed away from the inner tube 12, thus forming an air chamber a between the inner tube 12 and the outer tube 11; the second end of the inner tube 12 is close to the inner wall of the outer tube 11, thus forming the slit b.
[0053] Regarding the aforementioned conduit 13, please refer to Figure 2. The first end of the conduit 13 is in fluid communication with the first fluid channel 112, and the second end of the conduit 13 passes through the second end of the inner tube 12, with the second end of the conduit 13 facing the second end of the outer tube 11. Alternatively, the second end of the conduit 13 may be located inside the inner tube 12, meaning that the second end of the conduit 13 does not protrude from the second end of the inner tube 12.
[0054] When gas is introduced into the first fluid channel 112, the gas flows to the conduit 13. The gas is ejected from the second end of the conduit 13 towards the second end of the outer tube 11, forming an airflow. This airflow carries surrounding gas towards the second end of the outer tube 11, creating a negative pressure at the first end of the outer tube 11. Specifically, a negative pressure is generated on the side of the outer tube 11 opposite to the ejection direction from the conduit 13 port, causing the first end of the outer tube 11 to draw in gas and discharge it from the second end. The negative pressure at the first end of the outer tube 11 causes it to draw in more gas from the external environment, resulting in both the gas flow rate drawn in and the gas flow rate discharged from the outer tube 11 being significantly greater than the gas flow rate from the conduit 13. This allows the gas injection device 1 to generate a larger output airflow with a smaller input airflow, creating an airflow multiplication effect and increasing the gas flow rate of the gas injection device 1.
[0055] Please refer to Figure 3. In Figure 3, S1 represents the flow velocity of the gas ejected from conduit 13, and O represents the centerline of conduit 13. As shown in Figure 3, the gas flow ejected from conduit 13 is a turbulent fluid with a high velocity in the middle and a low velocity at the edges. Turbulent fluids typically exhibit significant gas noise.
[0056] When gas is introduced into the second fluid channel 113, the gas flows to the gas chamber a and is ejected from the slit b toward the second end of the outer tube 11. Please refer to Figure 3. In Figure 3, S2 is the flow velocity of the gas ejected from the duct 13 after the gas ejected from the duct and the gas ejected from the slit b are superimposed. As shown in Figure 3, the airflow ejected from the slit b will superimpose with the airflow ejected from the duct 13. If the airflow ejected from the slit b comes into contact with the edge of the airflow ejected from the duct 13, it will increase the flow velocity at the edge of the airflow ejected from the duct 13. This will change the turbulent airflow with low flow velocity at the edge of the duct 13 into an airflow with a more uniform overall flow velocity, making the airflow ejected from the duct 13 closer to a laminar flow state and reducing the noise of the airflow ejected from the duct 13.
[0057] Furthermore, the airflow ejected from slit b increases the overall flow velocity of the gas ejected from duct 13, enhances the negative pressure generated at the first end of outer tube 11 by the gas ejected from duct 13, enhances the effect of gas injection device 1 using a small airflow to drive a large airflow, and enhances the airflow multiplication effect.
[0058] Regarding the aforementioned Coanda surface 111, the Coanda effect, also known as the Coanda effect, refers to the phenomenon where, when there is surface friction (also known as fluid viscosity) between a fluid and the surface of an object it flows over, the fluid will flow along that surface as long as the curvature is not too large. The Coanda surface 111 is configured to generate the Coanda effect. For example, a suitable surface curvature is calculated based on the viscosity and preset flow rate of the fluid to be drawn into the gas injection device 1, and this curvature is then applied to the Coanda surface 111. When the fluid to be drawn into flows through the Coanda surface 111, the Coanda effect will occur.
[0059] By creating a slit b between the Coanda surface 111 and the outer wall of the inner tube 12, i.e., the Coanda surface 111 at least partially defines the slit b, when gas is blown out from the slit b to form an airflow, at least a portion of the airflow passes through the Coanda surface 111 and generates the Coanda effect. The airflow then flows along the inner wall of the outer tube 11. As the airflow flows along the inner wall of the outer tube 11, it carries away the gas on the side of the airflow away from the inner wall of the outer tube 11, causing a decrease in air pressure near the axis of the outer tube 11. This increases the negative pressure of the gas near the axis of the outer tube 11, increases the amount of gas drawn into the outer tube 11 from the external environment, and enhances the airflow multiplication effect.
[0060] In some embodiments, at least one of the outer tube 11, inner tube 12, and conduit 13 may be made of plastic and can be manufactured using 3D printing technology, which helps reduce production costs. Furthermore, any two or three of the outer tube 11, inner tube 12, and conduit 13 may be integrally printed. In other embodiments, at least one of the outer tube 11, inner tube 12, and conduit 13 may also be made of metal, and any two of the outer tube 11, inner tube 12, and conduit 13 may be connected integrally by assembly.
[0061] Regarding the specific structure of the outer tube 11, in some embodiments, please refer to Figure 2. The outer tube 11 includes a constriction section 114, a throat section 115, and an extension section 116 connected sequentially along the first direction X. An air chamber a is formed between the constriction section 114 and the inner tube 12. The inner wall of the constriction section 114 near the throat section 115 has a Coanda surface 111. Therefore, along the first direction X, the distance between at least part of the Coanda surface 111 and the axis of the outer tube 11 gradually decreases, so that the distance between the airflow ejected from the slit b and the axis of the outer tube 11 gradually decreases, thereby guiding the airflow ejected from the slit b to superimpose with the airflow ejected from the duct 13, improving the problem that the airflow ejected from the slit b cannot superimpose with the airflow ejected from the duct 13 or the superposition effect is poor.
[0062] In some embodiments, please refer to FIG2. The dotted line in FIG2 represents the throat section 115. The length of the throat section 115 is close to zero, that is, after the gas flows out of the constriction section 114, it immediately enters the extension section 116, which is beneficial to shorten the length of the outer tube 11.
[0063] In some embodiments, referring to FIG2, the length of the contraction section 114 is less than the length of the extension section 116. The gas flows in the extension section 116 for a longer time than it flows in the contraction section 114, which can generate a greater negative pressure in the contraction section 114 and increase the intake volume of the gas injection device 1.
[0064] In some embodiments, referring to FIG2, the extension section is tapered, and the small end of the extension section engages with the throat section. That is, along the first direction X, the inner diameter of the outer tube 11 first decreases and then increases, and the outer tube 11 forms a Laval tube; and the Coanda surface 111 is at least partially located in the contraction section 114, so the airflow ejected from the slit b passes through the contraction section 114, the throat section 115 and the extension section 116 in sequence, which accelerates the airflow ejected from the slit b, enhances the negative pressure in the outer tube 11, and causes the inner tube 12 to draw in more gas from the external environment.
[0065] In some embodiments, as shown in Figure 2, the contraction section 114, the throat section 115, and the extension section 116 are all rotating bodies. When the gas passes through the contraction section 114, it contracts uniformly from all sides towards the axis of the contraction section 114; when the gas passes through the extension section 116, it expands uniformly in a direction away from the axis of the extension section 116, which helps to reduce airflow turbulence and reduce gas energy loss.
[0066] Regarding the specific structure of the inner tube 12, please refer to Figures 1 and 2 in some embodiments. The inner tube 12 is a rotating body. When the gas passes through the connection between the inner tube 12 and the contraction section 114, the gas contracts uniformly from all sides towards the axis of the contraction section 114. That is, the cross-section of the gas is always circular, and the shape of the gas cross-section does not change. However, the shape change of the cross-section of the gas during flow will cause airflow turbulence. Therefore, this embodiment is beneficial to reduce airflow turbulence and reduce gas energy loss.
[0067] In some embodiments, the air chamber a is annular and surrounds the conduit 13. For example, referring to FIG2, when both the inner tube 12 and the outer tube 11 are sections of rotation corresponding to air chamber a, air chamber a is annular. Since the second end of the conduit 13 extends to the second end of the inner tube 12, air chamber a surrounds the conduit 13. By making air chamber a annular, the gas flowing toward the slit b is annular. In other embodiments, the section of the inner tube 12 corresponding to air chamber a may also partially contact the inner wall of the constriction section 114; in this case, air chamber a is not a complete annular shape, for example, it may be C-shaped, U-shaped, flat, etc.
[0068] In some embodiments, the slit b is annular and surrounds the conduit 13. For example, referring to FIG2, when both the inner tube 12 and the outer tube 11 are sections of rotation corresponding to the slit b, the slit b is annular, and the gas ejected from the slit b is annular. Since the second end of the conduit 13 extends to the second end of the inner tube 12, the slit b surrounds the conduit 13, and the gas ejected from the slit b surrounds the gas ejected from the conduit 13. In other embodiments, the section of the inner tube 12 corresponding to the slit b may also partially contact the inner wall of the contraction section 114. In this case, the slit b is not a complete annular shape, for example, it may be C-shaped, U-shaped, flat, etc.
[0069] In some embodiments, referring to FIG2, the side of the inner tube 12 facing the inner surface of the contraction section 114 includes a mating surface 121, which at least partially defines a slit b. The distance between any two points of the mating surface 121 and the inner surface of the contraction section 114 is equal. By making the mating surface 121 at least partially define the slit b, when gas is blown out from the slit b, at least a portion of the gas passes through the mating surface 121. The distance between any two points of the mating surface 121 and the inner surface of the contraction section 114 is equal, that is, at the location corresponding to the slit b and the mating surface 121, the width of the slit b in the radial direction of the inner tube 12 remains constant along the first direction X. When gas passes through the slit b corresponding to the mating surface 121, the cross-sectional area of the gas in the flow direction remains unchanged, which is beneficial for guiding the flow of gas, making the gas less prone to turbulence and dispersion when it is ejected from the slit b, and making it easier to form a jet. In some embodiments, the inner tube 12 defines the slit b by the mating surface 121, that is, the side of the slit b facing the inner tube 12 is completely defined by the mating surface 121.
[0070] In some embodiments, referring to Figure 2, the inner diameter of the inner tube 12 gradually decreases from its large opening to the slit b. That is, along the first direction X, the inner diameter of the inner tube 12 gradually decreases. When the inner tube 12 draws in gas from the external environment, the cross-sectional area of the gas gradually decreases along the gas flow direction, and the gas flow velocity increases. According to Bernoulli's principle, the gas pressure decreases as the gas passes through the inner tube 12, thereby increasing the negative pressure at the inner tube 12, causing the inner tube 12 to draw in more gas from the external environment.
[0071] In some embodiments, referring to Figure 2, the inner diameter of the inner wall of the inner tube 12 corresponding to the slit b gradually increases. That is, along the first direction X, the inner diameter of the inner tube 12 first decreases and then increases, forming a Laval tube, which accelerates the gas drawn into the inner tube 12, increases the flow velocity of the gas through the inner tube 12, enhances the negative pressure inside the inner tube 12, and allows the inner tube 12 to draw in more gas from the external environment.
[0072] Regarding the specific structure of the aforementioned conduit 13, in some embodiments, please refer to Figure 2. The conduit 13 includes an inlet section 131 and an outlet section 132. The inlet section 131 is disposed in the wall of the outer tube 11, specifically in the wall of the constriction section 114. The outlet section 132 is in fluid communication with the inlet section 131. The outlet section 132 is located within the constriction section 114, and its port faces the second end of the outer tube 11, i.e., towards the extension section 116. By disposing of the inlet section 131 in the wall of the outer tube 11, it is beneficial to separate the pipe connected to the inlet section 131 from the first end of the outer tube 11, reducing interference between the outer tube 11 and the air intake device. Furthermore, it can reduce the volume occupied by the conduit 13 within the constriction section 114, allowing the constriction section 114 to draw in more gas.
[0073] In some embodiments, referring to FIG2, the centerline of the ejection section 132 coincides with the centerline of the contraction section 114. That is, the ejection section 132 is positioned close to the centerline of the contraction section 114, which is beneficial to increasing the suction efficiency of the gas injection device 1. Furthermore, the centerline of the ejection section 132 coincides with the centerline of the contraction section 114 to sufficiently increase the suction efficiency of the gas injection device 1.
[0074] In some embodiments, referring to FIG2, the port of the conduit 13 located within the inner tube 12 ejects gas in a direction parallel to the first direction X. Exemplarily, the axis of the ejection section 132 is parallel to the first direction X. Thus, when gas is ejected from the ejection section 132, the airflow direction points towards the extension section 116, and the airflow ejected from the ejection section 132 does not need to change its flow direction within the extension section 116, which helps to reduce gas energy loss.
[0075] In some embodiments, referring to FIG2, the inlet section 131 extends radially along the constriction section 114, and the conduit 13 is partially curved to connect with the inlet section 131. Exemplarily, the conduit 13 further includes a curved section 133, which is a bend in the tube and connects the inlet section 131 to the outlet section 132. It is understood that the angle between the axis of the inlet section 131 and the axis of the outlet section 132 is a right angle. When gas directly enters the outlet section 132 from the inlet section 131, a significant amount of energy is lost. By smoothly connecting the inlet section 131 and the outlet section 132 through the bend in the tube-shaped curved section 133, the energy loss of the gas can be reduced.
[0076] In some embodiments, referring to Figure 2, the curved section 133 smoothly connects the inlet section 131 and the outlet section 132. A smooth connection means that the tangents to the centerlines at both ends of the curved section 133 are parallel to the centerlines of the inlet section 131 and the outlet section 132, respectively, and the centerline of the curved section 133 is a curve. For example, the centerline of the curved section 133 can be an arc, a parabola, an elliptical arc, etc. Preferably, the centerline of the curved section 133 is an arc to minimize gas energy loss.
[0077] In some embodiments, referring to FIG2, the inlet section 131 includes a narrowing section 1311. It is understood that the airflow flows in the inlet section 131 toward the axis of the narrowing section 114, such that the inner diameter of the narrowing section 131 gradually decreases in the direction toward the axis of the narrowing section 114. By providing the narrowing section 1311, the cross-sectional area through which the gas flows is reduced, thereby increasing the airflow velocity.
[0078] In some embodiments, referring to FIG2, the gas injection device 1 further includes a first connector 14, which is disposed on the outer wall of the constriction section 114 and is in fluid communication with the conduit 13. Exemplarily, both ends of the first fluid channel 112 are in fluid communication with the first connector 14 and the conduit 13, respectively. The first connector 14 is used to connect the pipe, facilitating the flow and communication between the conduit 13 and an external gas source.
[0079] In some embodiments, referring to FIG2, the gas injection device 1 further includes a second connector 15, which is disposed on the outer wall of the contraction section 114 and is in fluid communication with the gas chamber a. Exemplarily, both ends of the second fluid channel 113 are in fluid communication with the second connector 15 and the gas chamber a, respectively. The second connector 15 is used to connect a pipe, facilitating the flow and communication between the gas chamber a and an external gas source.
[0080] As one application scenario of the aforementioned gas injection device 1, please refer to Figure 4. This embodiment of the application provides a ventilation system 100, which includes a gas injection device 1, a ventilation pad 2, an air source 3, and a controller 4. The air source 3 is used to provide a continuous airflow, such as an air compressor, which can provide compressed air. The first fluid channel 112 of the gas injection device 1 is fluidly connected to the air source 3, for example, the first connector 14 is fluidly connected to the air source 3. When the air source 3 supplies gas to the first connector 14, a negative pressure is formed in the gas injection device 1, so that one end of the gas injection device 1 can draw in gas and the other end can discharge gas. One end of the gas injection device 1 is fluidly connected to the ventilation pad 2, thereby enabling it to blow or draw air into the ventilation pad 2. The controller 4 is located in the air passage between the air source 3 and the first fluid channel 112. The controller 4 is used to control the opening and closing of the air passage between the air source 3 and the first fluid channel 112, that is, to control whether gas is supplied to the first fluid channel 112. For example, the controller 4 is located on the pipe between the air source 3 and the first fluid channel 112. The controller 4 can be a solenoid valve or include multiple solenoid valves. Since the gas injection device 1 can generate a larger output airflow with a smaller input airflow, it enhances the ventilation effect of the ventilation system 100, which includes the blowing effect and the suction effect on the ventilation pad 2.
[0081] It should be noted that the ventilation system 100 described above includes a ventilation pad 2, an air source 3, and a controller 4, which is merely an example to illustrate the application scenario of the gas injection device 1. The ventilation system 100 may also exclude the ventilation pad 2, the air source 3, and the controller 4, or the ventilation system 100 may include another airflow distribution device, an airflow input device, or an airflow output device.
[0082] In some embodiments, the air chamber a is in fluid communication with the air source 3. For example, the second connector 15 is in fluid communication with the air source 3. A single air source 3 is used to supply air to both the conduit 13 and the air chamber a, reducing the number of air sources 3 and lowering production costs. The controller 4 is also located in the air passage between the air source 3 and the second fluid channel 113, and is used to control the opening and closing of the air passage between the air source 3 and the second fluid channel 113.
[0083] In some embodiments, the controller 4 independently controls the opening and closing of the air passages between the gas source 3 and the first fluid channel 112 and the second fluid channel 113. For example, the first fluid channel 112 and the second fluid channel 113 are respectively fluidly connected to the controller 4 through pipes. In other embodiments, the controller 4 is used to simultaneously control the opening and closing of the air passages between the gas source 3 and the first fluid channel 112 and the second fluid channel 113. For example, referring to FIG. 2, the first connector 14 and the second connector 15 are fluidly connected to the controller 4 through the same pipe, so that the controller 4 synchronously controls the gas supply to the conduit 13 and the air chamber a.
[0084] Referring to Figures 4 and 5, the ventilation pad 2 includes a sealing sleeve 21 and a breathable partition 22. One side of the sealing sleeve 21 has multiple first ventilation holes 211, and the other side has second ventilation holes 212. The breathable partition 22 is located inside the sealing sleeve 21, and one end of the outer tube 11 of the gas injection device 1 is connected to the second ventilation hole 212. Alternatively, there may be only one second ventilation hole 212, meaning the sealing sleeve 21 has at least one second ventilation hole 212. The breathable partition 22 is mesh-like, allowing airflow to pass through it and providing support to prevent blockage of the fluid passage when the sealing sleeve 21 is under pressure.
[0085] In some embodiments, as shown in Figure 4, the ventilation pad 2 is applied to a seat. For example, the ventilation pad 2 is installed in the seat to dissipate heat. The first ventilation hole 211 faces the seating space of the seat, which is used by the occupant. When the first ventilation hole 211 draws in or blows air, it can remove air from the area around the occupant, thereby dissipating heat from the seating space. The ventilation pad 2 is disposed within the seat or is part of the seat; when the first ventilation hole 211 draws in or blows air, it also dissipates heat from the seat.
[0086] It should be noted that chairs typically have multiple sections, such as the seat, backrest, armrest, leg rest, and headrest, each corresponding to a part of the occupant's body. The seat supports the occupant's buttocks and thighs, the backrest provides support for the occupant's back, the armrest supports the occupant's arms, the leg rest provides support for the occupant's lower legs, and the headrest provides support for the occupant's head.
[0087] The seating space includes not only the semi-enclosed space formed by the seat and backrest, but also the space in which the occupant moves while seated. This includes, for example, the space for the occupant's legs and surrounding area, the space for arm movement, and the space for head movement.
[0088] In some embodiments, the plurality of first ventilation holes 211 include a plurality of first ventilation holes 211 with different shapes and sizes, thereby having different suction and blowing effects. For example, one of the first ventilation holes 211 on the sealing sleeve 21 is circular, another of the first ventilation holes 211 is rectangular, and yet another of the first ventilation holes 211 is triangular, etc. For example, the sealing sleeve 21 has a plurality of circular first ventilation holes 211, one of the first ventilation holes 211 has a diameter of 1 cm, another of the first ventilation holes 211 has a diameter of 2 cm, and yet another of the first ventilation holes 211 has a diameter of 3 cm, etc.
[0089] In some embodiments, the number of first ventilation holes 211 is greater than the number of second ventilation holes 212. That is, the ventilation pad 2 has a diversion function, which helps to form a larger number of air intake or air blowing ports in the seat, thereby improving the uniformity of air blowing or inhaling from the seat to the occupant.
[0090] The second ventilation hole 212 is positioned opposite to the first ventilation hole 211, meaning that the first ventilation hole 211 and the second ventilation hole 212 are located on opposite sides of the ventilation pad 2, for example, on opposite sides along the thickness direction of the ventilation pad 2. This allows gas to pass through the ventilation pad 2 in one direction, which helps reduce the resistance encountered by the gas within the ventilation pad 2, reduces gas energy loss, and improves the heat dissipation effect on the seat. Furthermore, in this embodiment, the first ventilation hole 211 and the second ventilation hole 212 are located on opposite sides of the ventilation pad 2 along the thickness direction, which helps to shorten the path length of the gas flow within the ventilation pad 2 and reduce gas energy loss.
[0091] In some embodiments, referring to Figures 4 and 5, the ventilation pad 2 is flat, making it easy to cover the seat frame or be disposed within the seat, reducing its impact on seat size. The ventilation pad 2 can be used directly as a seat cover, reducing the resistance to ventilation caused by the original seat cover and also reducing the size of the seat. Optionally, the ventilation pad 2 is rectangular. Optionally, the ventilation pad 2 is adapted to the shape of the seat cover, thereby directly replacing the original seat cover.
[0092] In some embodiments, the sealing sleeve 21 is elastic or plastic, and can deform when a occupant sits on the seat and applies pressure to the sealing sleeve 21, thereby improving the occupant's comfort. The sealing sleeve 21 can be made of genuine leather, artificial leather, plastic, rubber, silicone, etc.
[0093] It should be noted that when air is inhaled or exhaled onto the sealing sleeve 21, the sealing sleeve 21 will expand or contract due to changes in internal air pressure, affecting the shape of the seat and the comfort of the occupant. The breathable layer 22, supported within the ventilation pad 2, can support the sealing sleeve 21 when air is inhaled, mitigating the contraction problem. The breathable layer 22 can be bonded to the inner wall of the sealing sleeve 21, and when air is exhaled onto the sealing sleeve 21, it can hold the sealing sleeve 21 in place, mitigating its expansion. Optionally, the breathable layer 22 can be made of plastic, metal, or other materials, possessing a certain strength and elasticity to address the issues of the ventilation pad 2 easily collapsing or becoming too rigid, which can lead to poor seat comfort.
[0094] In some embodiments, referring to FIG5, the breathable barrier 22 has gas channels 221 along its thickness direction, and a plurality of gas channels 221 are arranged at intervals along the length and width directions of the breathable barrier 22. Gas can pass through the breathable barrier 22 along its thickness direction, reducing the obstruction of the breathable barrier 22 to the gas and reducing gas energy loss.
[0095] In this design, a gap exists between the breathable partition 22 and the inner wall of the sealing sleeve 21 along the thickness direction of the breathable partition 22, allowing gas to flow in a direction perpendicular to the thickness of the breathable partition 22. It is understood that the first ventilation hole 211 and the second ventilation hole 212 may not be directly aligned along the thickness direction of the ventilation pad 2. Therefore, gas needs to flow a certain distance perpendicular to the thickness of the ventilation pad 2 before it can flow from one of the first ventilation hole 211 to the other. By providing a gap between the breathable partition 22 and the inner wall of the sealing sleeve 21, a channel perpendicular to the thickness direction of the ventilation pad 2 can be formed. This not only allows gas flow between the first ventilation hole 211 and the second ventilation hole 212 but also makes the suction or blowing intensity of the multiple first ventilation holes 211 more uniform. In some other embodiments, the breathable partition 22 also has a gas channel 221 perpendicular to its thickness direction.
[0096] In some embodiments, the ventilation system 100 includes a plurality of gas injection devices 1, and the sealing sleeve 21 is provided with a plurality of second ventilation holes 212. The outer tubes 11 of the plurality of gas injection devices 1 are connected one-to-one with the plurality of second ventilation holes 212. That is, each gas injection device 1 is in fluid communication with one second ventilation hole 212, and the heat dissipation effect of the ventilation pad 2 is enhanced by the fluid communication between the plurality of gas injection devices 1 and a single ventilation pad 2. The gas injection devices 1 can have various models, and different models of gas injection devices 1 have different shapes and / or sizes, thereby having different suction and blowing effects. The plurality of gas injection devices 1 connected to the same ventilation pad 2 can include various models, that is, a ventilation pad 2 is equipped with a variety of models of gas injection devices 1.
[0097] In some embodiments, the controller 4 is in fluid communication with multiple gas injection devices 1, and the controller 4 is used to independently control the opening and closing of the air passage between the gas source 3 and any one of the gas injection devices 1. This allows control over the flow rate of air drawn into or blown onto the ventilation pad 2, thus controlling the heat dissipation intensity of the seat. For example, based on the different ventilation levels required by the occupant of the seat, the corresponding number of gas injection devices 1 can be controlled to draw in or blow air onto the ventilation pad 2, thereby adjusting the intensity of airflow from the ventilation pad 2 to the occupant, i.e., controlling the heat dissipation intensity of the seat.
[0098] In some embodiments, the sealed connection between the outer tube 11 and the inner tube 12 is abutted against the second ventilation hole 212. That is, the constriction section 114 is in fluid communication with the first ventilation hole 211 through the second ventilation hole 212, thereby drawing away the gas near the first ventilation hole 211 and the gas in the seating space, thus dissipating heat from the seating space and the seat. Heat dissipation by drawing in air is more beneficial to improving the comfort of the occupant compared to blowing air.
[0099] As one application scenario of the aforementioned gas injection device 1 or ventilation system 100, this application embodiment also provides a seat (not shown). The seat includes a gas injection device 1, and at least one of the seat, backrest, armrest, leg area, and headrest is provided with a ventilation pad 2. A first ventilation hole 211 faces the seating space of the seat. The ventilation system 100 has an enhanced ventilation effect, improving the problems of poor heat dissipation, low heat dissipation efficiency, and inability to quickly cool the seat. Furthermore, it can reduce the gas flow rate requirement of the gas injection device 1 on the duct 13, thus appropriately reducing the gas output flow rate and gas velocity of the gas source 3, reducing seat noise, and reducing the energy consumption of the gas source 3.
[0100] As one application scenario of the aforementioned gas injection device 1, this application embodiment also provides a hair dryer (not shown), which includes the gas injection device 1. The gas injection device 1 can generate a larger output airflow with a smaller input airflow, thereby increasing the output airflow of the hair dryer, and thus enhancing the wind power and / or increasing the air volume of the hair dryer.
[0101] 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 gas injection device, characterized in that, The device includes an outer tube and an inner tube located inside the outer tube. The inner diameter of one end of the inner tube is larger than the inner diameter of the other end. One end of the outer tube is sealed to the larger end of the inner tube. A portion of the inner wall of the outer tube and the inner tube enclose a chamber. Another portion of the inner wall of the outer tube has a Coanda surface. A slit is formed between the Coanda surface and the outer wall corresponding to the smaller end of the inner tube. The slit allows fluid communication between the chamber and the outside of the outer tube. The sidewall of the outer tube has at least one first fluid channel for introducing a fluid source and at least one second fluid channel for introducing a fluid source. The first fluid channel is in fluid communication with one end of a conduit. The other end of the conduit passes through the sidewall of the inner tube and extends to the smaller end of the inner tube or exits the inner tube. The second fluid channel is in fluid communication with the chamber.
2. The gas injection device according to claim 1, characterized in that, The outer tube includes a constriction section, a throat section, and an extension section connected sequentially along a first direction. The air chamber is formed between the constriction section and the inner tube. The inner wall of the constriction section near the throat section has the Coanda surface.
3. The gas injection device according to claim 2, characterized in that, The extension segment is tapered, and the small end of the extension segment engages with the throat segment.
4. The gas injection device according to claim 1, characterized in that, The air chamber is annular and surrounds the conduit.
5. The gas injection device according to claim 2, characterized in that, The ejection direction of the port of the conduit located inside the inner tube is parallel to the first direction.
6. The gas injection device according to claim 1, characterized in that, The inner diameter of the inner tube gradually decreases from the wide end to the slit, while the inner diameter of the inner wall of the portion of the inner tube corresponding to the slit gradually increases.
7. A ventilation system, characterized in that, include: The gas injection device as described in any one of claims 1 to 6; The gas source is in fluid communication with the first fluid channel and the second fluid channel, respectively; A ventilation pad includes a sealing sleeve and a breathable partition. One side of the sealing sleeve has multiple first ventilation holes, and the other side of the sealing sleeve has a second ventilation hole. The breathable partition is disposed inside the sealing sleeve. The port of the outer tube that is sealed to the inner tube is connected to the second ventilation hole. A controller is provided in the gas path between the gas source and the first fluid channel and the second fluid channel. The controller is used to independently control the opening and closing of the gas path between the gas source and the first fluid channel and the second fluid channel.
8. The ventilation system according to claim 7, characterized in that, The ventilation system includes multiple gas injection devices, and the sealing sleeve is provided with multiple second ventilation holes. The outer pipes of the multiple gas injection devices are connected to the multiple second ventilation holes one by one.
9. A type of seat, characterized in that, Including the ventilation system as described in claim 7 or 8, at least one of the seat, backrest, armrest, leg and headrest of the seat is provided with the ventilation pad, and the first ventilation hole faces the seating space of the seat.
10. A hair dryer, characterized in that, Includes the gas injection device as described in any one of claims 1 to 6.