Gas injection device, ventilation system, seat and blower

Abstract

The utility model relates to the technical field of fluid, in particular to a gas injection device, a ventilation system, a seat and a blower. The gas injection device comprises an outer pipe and an inner pipe located in the outer pipe, the inner diameter of a pipe opening in one end of the inner pipe is larger than that of a pipe opening in the other end, one end of the outer pipe is connected with the large-opening end of the inner pipe in a sealed mode, a gas chamber is defined by part of the inner wall of the outer pipe and the inner pipe, and the other part of the inner wall of the outer pipe is provided with a Coanda surface. A slit is formed between the Coanda surface and the outer wall corresponding to the small opening end of the inner pipe, the air chamber is communicated with fluid outside the outer pipe through the slit, and one end of the guide pipe penetrates through the side wall of the inner pipe and extends to the small opening end of the inner pipe or penetrates out of the inner pipe. By means of the mode, the gas injection device drives large gas flow through small gas flow, and the gas flow multiplication effect is generated. The gas sprayed out of the slit enables the gas flow sprayed out of the guide pipe to be close to a laminar flow state, noise of the gas sprayed out of the guide pipe is reduced, the overall flow speed of the gas sprayed out of the guide pipe is increased, and the gas flow multiplication effect is enhanced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fluid, in particular to a gas injection device, a ventilation system, a seat and a hair dryer. BACKGROUND

[0002] At present, with the improvement of production level, the walk-replacing equipment such as automobile, ship, train, high-speed rail and airplane brings many conveniences for people's life, work and study, and occupies an important position in people's travel life. With the improvement of people's living standard, people's requirement for riding comfort is getting stronger and stronger.

[0003] An important factor affecting the riding comfort is the heat dissipation effect of the seat. In the related art, the seat mostly uses a fan as a gas source to realize the heat dissipation of the seat by blowing or sucking air to the seat. However, the air volume of the fan is limited, so that the heat dissipation effect of the seat is not obvious, the heat dissipation efficiency is slow, and the seat cannot be quickly cooled. CONTENT OF THE INVENTION

[0004] Embodiments of the present application aim to provide a gas injection device, a ventilation system, a seat and a hair dryer, so as to at least solve the problems of poor heat dissipation effect, low heat dissipation efficiency and inability to quickly cool the seat.

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

[0006] In a first aspect, the embodiments of the present application provide a gas injection device, which comprises an outer pipe and an inner pipe located inside the outer pipe. The inner diameter of the pipe opening at one end of the inner pipe is greater than that at the other end. One end of the outer pipe is sealingly connected to the large-end of the inner pipe. A part of the inner wall of the outer pipe and the inner pipe form a gas chamber. Another part of the inner wall of the outer pipe has a Coanda surface. The Coanda surface and the outer wall corresponding to the small-end of the inner pipe form a slit. The slit makes the gas chamber and the outside of the outer pipe in fluid communication. The side wall of the outer pipe 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 side wall of the inner pipe and extends to the small-end of the inner pipe or penetrates out of the inner pipe. The second fluid channel is in fluid communication with the gas chamber.

[0007] In some embodiments, the outer pipe comprises a contraction section, a throat section and an extension section connected in sequence in a first direction. The contraction section and the inner pipe form the gas chamber. A part of the inner wall of the contraction section close to the throat section has a Coanda surface.

[0008] In some embodiments, the extension section is tapered, the small end of the extension section is connected to the throat section.

[0009] In some embodiments, the air chamber is annular, the air chamber surrounds the conduit.

[0010] In some embodiments, the port of the conduit in the inner tube is parallel to the first direction.

[0011] In some embodiments, the inner diameter of the inner tube gradually decreases between the large end of the inner tube and the slit, and the inner diameter of the inner wall of the inner tube corresponding to the slit gradually increases.

[0012] In a second aspect, the embodiments of the present application provide a ventilation system, the ventilation system comprising a gas source, a ventilation pad, a controller and the gas injection device; the gas source is in fluid communication with the first fluid channel and the second fluid channel respectively; the ventilation pad comprises a sealing sleeve and a gas-permeable layer, 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 gas-permeable layer is arranged in the sealing sleeve; the port of the outer tube and the inner tube in sealing connection is connected to the second ventilation hole; the controller is arranged in the gas path between the gas source and the first fluid channel and the second fluid channel, and the controller is used for independently controlling the on-off of the gas path between the gas source and the first fluid channel and the second fluid channel respectively.

[0013] In some embodiments, the ventilation system comprises a plurality of the gas injection devices, the sealing sleeve is provided with a plurality of the second ventilation holes, and the outer tubes of the plurality of the gas injection devices are connected to the plurality of the second ventilation holes.

[0014] In a third aspect, the embodiments of the present application provide a seat, the seat comprising the ventilation system as described above, at least one of the seat part, the back part, the armrest part, the leg part and the head part of the seat is provided with the ventilation pad, and the first ventilation hole is directed to the seating space of the seat.

[0015] In a fourth aspect, the embodiments of the present application provide a hair dryer, the hair dryer comprising the gas injection device as described above.

[0016] The gas injection device of the embodiments of the present application can generate negative pressure on the side of the outer tube away from the port of the conduit when the gas is injected into the conduit and sprayed in the outer tube, so that the outer tube sucks in the gas, so that the gas injection device drives a large air flow with a small air flow, that is, a larger output air flow is generated with a smaller input air flow, and the air flow multiplication effect is generated.

[0017] The gas flow sprayed from the conduit is a turbulent flow with high flow rate in the middle part and low flow rate in the edge part, and the gas flow sprayed from the slit is superimposed on the gas flow sprayed from the conduit, for example, the gas flow sprayed from the slit contacts the edge part of the gas flow sprayed from the conduit, increases the flow rate of the edge part of the gas flow sprayed from the conduit, changes the turbulent gas flow with low flow rate in the edge part into a gas flow with more uniform flow rate, makes the gas flow sprayed from the conduit close to the state of laminar flow, and reduces the noise of the gas flow sprayed from the conduit.

[0018] In addition, the gas flow sprayed from the slit increases the overall flow rate of the gas flow sprayed from the conduit, enhances the negative pressure generated by the gas flow sprayed from the conduit in the outer tube, enhances the effect of the gas injection device on driving a large gas flow with a small gas flow, and enhances the gas flow multiplication effect.

[0019] By forming the slit between the Coanda surface and the outer wall of the inner tube, that is, the Coanda surface at least partially defines the slit, when the gas is blown out from the slit to form a gas flow, at least part of the gas flow passes through the Coanda surface and generates the Coanda effect, and then the gas flow flows along the inner wall of the outer tube. When the gas flow flows along the inner wall of the outer tube, the gas flow carries away the gas on the side of the gas flow away from the inner wall of the outer tube, so that the air pressure near the center line of the outer tube in the outer tube is reduced, the negative pressure of the gas near the center line of the outer tube in the outer tube is enhanced, the gas sucked into the outer tube from the external environment is increased, and the gas flow multiplication effect is enhanced.

[0020] The ventilation system of the embodiment of the present application comprises the gas injection device, which can generate a larger output gas flow with a smaller input gas flow, and enhances the ventilation effect of the ventilation system.

[0021] The seat of the embodiment of the present application comprises the ventilation system, which has an enhanced ventilation effect, and solves the problems of poor heat dissipation effect, low heat dissipation efficiency and inability to rapidly cool the seat.

[0022] The hair dryer of the embodiment of the present application comprises the gas injection device, which can generate a larger output gas flow with a smaller input gas flow, and increases the output gas flow of the hair dryer.

[0023] The above description is only a summary of the technical solutions of the present application, in order to more clearly understand the technical means of the present application, the specific embodiments of the present application can be implemented according to the content of the description, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0024] One or more embodiments are exemplarily illustrated by corresponding drawings, which do not constitute a limitation on the embodiments, and elements with the same reference numerals in the drawings represent similar elements, unless otherwise specified, and the drawings do not constitute a proportional limitation.

[0025] Figure 1 is a structural schematic diagram of a gas injection device according to an embodiment of the present application;

[0026] Figure 2 is an axial cross-sectional view of a gas injection device according to an embodiment of the present application;

[0027] Figure 3 is a schematic diagram of the principle of superposition of the gas flow injected by the slit and the gas flow injected by the duct in a gas injection device according to an embodiment of the present application;

[0028] Figure 4 is a structural schematic diagram of a ventilation system according to an embodiment of the present application;

[0029] Figure 5 is a perspective view of Figure 4 a ventilation mat.

[0030] The reference signs in the detailed description are as follows:

[0031] 100, ventilation system;

[0032] 1, gas injection device;

[0033] 11, outer tube; 111, Coanda surface; 112, first fluid passage; 113, second fluid passage; 114, converging section; 115, throat section; 116, diverging section;

[0034] 12, inner tube; 121, mating surface;

[0035] 13, duct; 131, inlet section; 1311, narrowing; 132, outlet section; 133, curved section;

[0036] a, gas chamber; b, slit; 14, first joint; 15, second joint;

[0037] 2, ventilation mat; 21, sealing sleeve; 211, first ventilation hole; 212, second ventilation hole; 22, air-permeable barrier; 221, gas passage;

[0038] 3, gas source;

[0039] 4, controller;

[0040] X, first direction. DETAILED DESCRIPTION

[0041] For the convenience of understanding the present application, the present application will be described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely intended to explain the present application and are not intended to limit the present application. It should be noted that when an element is described as "fixed to" another element, it can be directly on the other element or one or more intervening elements can be present therebetween. When an element is described as "connected to" another element, it can be directly connected to the other element or one or more intervening elements can be present therebetween.

[0042] 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 belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application; the description and claims of this application as well as the above-mentioned accompanying drawings, the terms "comprising" and "having," and any variations thereof, are intended to cover both the inclusive and exclusive aspects of the terms.

[0043] In the description of the embodiments of the present application, the orientations or positional relationships indicated by the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like are based on the orientations or positional relationships shown in the drawings, and are merely for the purpose of facilitating the description of the embodiments of the present application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0044] In the description of the embodiments of the present application, the use of the terms "first", "second", and the like to describe a component does not have a special meaning, and therefore cannot be understood as limiting the scope of protection of the present application, unless otherwise stated. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0045] Unless otherwise defined, all technical and scientific terms used in the specification are intended to have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and / or" used in the specification of the present application includes any and all combinations of one or more related listed items.

[0046] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0047] Please refer to Figure 1The gas injection device 1 is used for fluid communication with a gas source 3, and achieves gas suction and blowing at two ends of the gas injection device 1 respectively.

[0048] Please refer to Figure 1 and Figure 2 , the gas injection device 1 includes an outer tube 11, an inner tube 12 and a guide tube 13. The inner tube 12 is located inside the outer tube 11, the inner tube 12 has a larger inner diameter at one end than at the other end, one end of the outer tube 11 is sealingly connected 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 form a gas chamber a, and the other portion of the inner wall of the outer tube 11 has a coanda surface 111, the coanda surface 111 and the outer wall corresponding to the small end of the inner tube 12 form a gap b, the gap b allows the gas chamber a to be in fluid communication with the outside of the outer tube 11; the side wall of the outer tube 11 has at least one first fluid passage 112 for introducing a fluid source and at least one second fluid passage 113 for introducing a fluid source, the first fluid passage 112 is in fluid communication with one end of the guide tube 13, the other end of the guide tube 13 passes through the side wall of the inner tube 12 and extends to the small end of the inner tube 12 or penetrates out of the inner tube 12, and the second fluid passage 113 is in fluid communication with the gas chamber a.

[0049] For the above-mentioned outer tube 11, please refer to Figure 1 and Figure 2 , the outer tube 11 is in the shape of a tube, for example, a circular tube, a square tube, etc., and has two ports.

[0050] For the above-mentioned inner tube 12, please refer to Figure 1 and Figure 2 , the inner tube 12 is in the shape of a tube, for example, a circular tube, a square tube, etc., and has two ports. The first end of the inner tube 12 is sealingly connected to the first end of the outer tube 11, the second end of the inner tube 12 extends towards the second end of the outer tube 11, and there is a gap between the inner tube 12 and the outer tube 11, thereby forming a gas chamber a between the inner tube 12 and the outer tube 11, and forming a gap b between the inner tube 12 and the inner wall of the outer tube 11. Exemplarily, the inner tube 12 is recessed towards the direction away from the outer tube 11, and / or the outer tube 11 is recessed towards the direction away from the inner tube 12, thereby forming the gas 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, thereby forming the gap b.

[0051] For the above-mentioned guide tube 13, please refer to Figure 2 , the first end of the guide tube 13 is in fluid communication with the first fluid passage 112, and the second end of the guide tube 13 penetrates through the second end of the inner tube 12 and extends towards the second end of the outer tube 11. The second end of the guide tube 13 can also be located inside the inner tube 12, i.e., the second end of the guide tube 13 does not penetrate out of the second end of the inner tube 12.

[0052] When the gas is input into the first fluid passage 112, the gas flows to the conduit 13, the gas is ejected from the second end of the conduit 13 toward the second end of the outer tube 11 and forms a gas flow, the gas flow drives the surrounding gas to flow toward the second end of the outer tube 11, thereby forming a negative pressure in the first end of the outer tube 11, that is, a negative pressure is generated in the outer tube 11 on the side of the conduit 13 port away from the ejection direction of the conduit 13 port, so that the first end of the outer tube 11 inhales the gas and discharges the gas from the second end of the outer tube 11. Wherein, the negative pressure generated in the first end of the outer tube 11 causes the outer tube 11 to inhale more gas from the external environment, so that the gas flow rate of the gas inhaled by the outer tube 11 and the gas flow rate of the gas discharged are both much larger than the gas flow rate of the conduit 13. So that the gas injection device 1 drives a large gas flow with a small gas flow, that is, a smaller input gas flow generates a larger output gas flow, which produces a gas flow multiplication effect and increases the gas flow of the gas injection device 1.

[0053] Wherein, please refer to Figure 3 , Figure 3 In the figure, S1 is the flow rate of the gas ejected from the conduit 13, and O is the axis of the conduit 13. From the figure, it can be seen that the gas flow ejected from the conduit 13 is a turbulent flow with high flow rate in the middle part and low flow rate in the edge part. And the turbulent flow usually has a large gas noise. Figure 3

[0054] When the gas is input into the second fluid passage 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 continue to refer to Figure 3 , Figure 3 In the figure, S2 is the flow rate of the gas ejected from the conduit 13 after the gas ejected from the conduit and the gas ejected from the slit b are superimposed. From the figure, it can be seen that the gas flow ejected from the slit b will superimpose the gas flow ejected from the conduit 13, for example, the gas flow ejected from the slit b contacts the edge part of the gas flow ejected from the conduit 13, increases the flow rate of the edge part of the gas flow ejected from the conduit 13, so that the gas flow ejected from the conduit 13 changes from a turbulent flow with low flow rate in the edge part to a gas flow with more uniform flow rate, so that the gas flow ejected from the conduit 13 approaches the state of laminar flow, and reduces the noise of the gas flow ejected from the conduit 13. Figure 3 And the gas flow ejected from the slit b increases the overall flow rate of the gas ejected from the conduit 13, enhances the negative pressure generated by the gas ejected from the conduit 13 in the first end of the outer tube 11, enhances the effect of the gas injection device 1 driving a large gas flow with a small gas flow, and enhances the gas flow multiplication effect.

[0055]

[0056] ​​For the above-mentioned Coanda surface 111, the Coanda effect (also known as the Coandă effect) refers to the phenomenon that when there is surface friction (or fluid viscosity) between the fluid and the surface of the object through which the fluid flows, the fluid will flow along the surface of the object as long as the curvature is not large. The Coanda surface 111 is a surface configured to generate the Coanda effect. For example, a suitable curvature is calculated according to the viscosity of the fluid to be inhaled by the gas jet device 1, the preset flow rate, and other characteristics, and then the curvature is applied to the Coanda surface 111. When the fluid to be inhaled flows through the Coanda surface 111, the Coanda effect is generated.

[0057] By forming a gap b between the Coanda surface 111 and the outer wall of the inner tube 12, that is, the Coanda surface 111 at least partially defines the gap b, at least part of the gas flow generated by the gas blowing out of the gap b passes through the Coanda surface 111 and generates the Coanda effect, and then the gas flow flows along the inner wall of the outer tube 11. When the gas flow flows along the inner wall of the outer tube 11, the gas flow carries away the gas on the side of the gas flow away from the inner wall of the outer tube 11, so that the air pressure near the axis of the outer tube 11 inside the outer tube 11 is reduced, the negative pressure of the gas near the axis of the outer tube 11 inside the outer tube 11 is increased, the gas inhaled from the external environment by the outer tube 11 is increased, and the gas flow multiplication effect is enhanced.

[0058] In some embodiments, at least one of the outer tube 11, the inner tube 12, and the conduit 13 can be made of plastic material and can be manufactured by 3D printing technology, which is advantageous in reducing production cost, and any two or all of the outer tube 11, the inner tube 12, and the conduit 13 can be integrally printed. In other embodiments, at least one of the outer tube 11, the inner tube 12, and the conduit 13 can also be made of metal material, and any two of the outer tube 11, the inner tube 12, and the conduit 13 can also be connected integrally by assembly.

[0059] For the specific structure of the above-mentioned outer tube 11, in some embodiments, referring to Figure 2 , the outer tube 11 includes a contraction section 114, a throat section 115, and an extension section 116 connected in sequence along the first direction X, the contraction section 114 and the inner tube 12 form an air chamber a, and the part of the inner wall of the contraction section 114 near the throat section 115 has the Coanda surface 111. Therefore, along the first direction X, the distance between the Coanda surface 111 and the axis of the outer tube 11 gradually decreases, so that the distance between the gas flow blown out of the gap b and the axis of the outer tube 11 gradually decreases, thereby guiding the gas flow blown out of the gap b to superimpose on the gas flow blown out of the conduit 13, and improving the problem that the gas flow blown out of the gap b cannot superimpose on the gas flow blown out of the conduit 13 or the superimposition effect is poor.

[0060] In some embodiments, referring to Figure 2 , Figure 2The middle dotted line is the throat section 115, and the length of the throat section 115 tends to be zero, i.e., after the gas flows out of the converging section 114, it immediately enters the extended section 116, which is conducive to shortening the length of the outer tube 11.

[0061] In some embodiments, referring to Figure 2 , the length of the converging section 114 is less than the length of the extended section 116. The time for the gas to flow in the extended section 116 is greater than the time for the gas to flow in the converging section 114, which can generate greater negative pressure in the converging section 114 and increase the gas suction amount of the gas injection device 1.

[0062] In some embodiments, referring to Figure 2 , the extended section is tapered, and the small end of the extended section is connected 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 converging section 114, so that the gas flow sprayed by the slit b passes through the converging section 114, the throat section 115 and the extended section 116 in turn, so that the gas flow sprayed by the slit b is accelerated, the negative pressure in the outer tube 11 is enhanced, and more gas is sucked into the inner tube 12 from the external environment.

[0063] In some embodiments, referring to Figure 2 , the converging section 114, the throat section 115 and the extended section 116 are all revolution bodies. When the gas passes through the converging section 114, it uniformly shrinks from all around to the axial line of the converging section 114; when the gas passes through the extended section 116, the gas uniformly expands away from the axial line of the extended section 116, which is conducive to reducing flow turbulence and reducing energy loss of the gas.

[0064] For the specific structure of the inner tube 12 described above, in some embodiments, referring to Figure 1 and Figure 2 , the inner tube 12 is a revolution body. When the gas passes through the connection between the inner tube 12 and the converging section 114, the gas uniformly shrinks from all around to the axial line of the converging section 114, i.e., the cross section of the gas is always circular, and the shape of the cross section of the gas does not change, and the shape change of the cross section of the gas during the flow process will cause flow turbulence, so this embodiment is conducive to reducing flow turbulence and reducing energy loss of the gas.

[0065] In some embodiments, the gas chamber a is annular, and the gas chamber a surrounds the catheter 13. Exemplarily, referring to Figure 2When the inner tube 12 and the outer tube 11 corresponding to the air chamber a are both rotary bodies, the air chamber a is annular. Since the second end of the conduit 13 extends to the second end of the inner tube 12, the air chamber a surrounds the conduit 13. By making the air chamber a annular, the gas flowing towards the slit b is annular. In other embodiments, the inner tube 12 corresponding to the air chamber a can also partially contact the inner wall of the contraction section 114, at which time the air chamber a is not a complete annular, such as a "C" shape, a "U" shape, a flat shape, etc.

[0066] In some embodiments, the slit b is annular, and the slit b surrounds the conduit 13. For example, please refer to Figure 2 When the inner tube 12 and the outer tube 11 corresponding to the slit b are both rotary bodies, the slit b is annular, and the gas sprayed 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 sprayed from the slit b surrounds the gas sprayed from the conduit 13. In other embodiments, the inner tube 12 corresponding to the slit b can also partially contact the inner wall of the contraction section 114, at which time the slit b is not a complete annular, such as a "C" shape, a "U" shape, a flat shape, etc.

[0067] In some embodiments, please refer to Figure 2 The side of the inner tube 12 facing the inner surface of the contraction section 114 includes a fitting surface 121, the fitting surface 121 at least partially defines the slit b, and the distance between any two places of the fitting surface 121 and the inner surface of the contraction section 114 is equal. By making the fitting surface 121 at least partially define the slit b, at least part of the gas blown from the slit b passes through the fitting surface 121. The distance between any two places of the fitting surface 121 and the inner surface of the contraction section 114 is equal, that is, at the slit b corresponding to the fitting surface 121, the width of the slit b along the radial direction of the inner tube 12 is constant along the first direction X. When the gas passes through the slit b corresponding to the fitting surface 121, the cross-sectional area of the gas along the flow direction is constant, which is conducive to guiding the flow direction of the gas, so that the gas is not easy to be disordered and loose when it is sprayed from the slit b, and it is easier to form a jet.

[0068] In some embodiments, please refer to Figure 2 The inner diameter of the inner tube 12 gradually decreases between the large end of the inner tube 12 and the slit b. That is, the inner diameter of the inner tube 12 gradually decreases along the first direction X. When the inner tube 12 inhales the gas from the external environment, the cross-sectional area of the gas gradually decreases along the flow direction of the gas, and the flow rate of the gas increases. According to Bernoulli's principle, the gas pressure decreases when the gas passes through the inner tube 12, thereby enhancing the negative pressure at the inner tube 12, so that the inner tube 12 inhales more gas from the external environment.

[0069] In some embodiments, referring to Figure 2 , the inner tube 12 has an inner diameter gradually increasing at the portion corresponding to the slit b. Namely, along the first direction X, the inner tube 12 has an inner diameter gradually decreasing and then increasing. The inner tube 12 forms a Laval tube, which accelerates the gas sucked into the inner tube 12, increases the flow rate of the gas flowing through the inner tube 12, and enhances the negative pressure in the inner tube 12, so that the inner tube 12 can suck more gas from the ambient environment.

[0070] For the specific structure of the conduit 13, in some embodiments, referring to Figure 2 , the conduit 13 includes an introduction section 131 and an ejection section 132. The introduction section 131 is arranged on the wall of the outer tube 11, and can be arranged on the wall of the contraction section 114. The ejection section 132 is in fluid communication with the introduction section 131, and is located in the contraction section 114 and has a port facing the second end of the outer tube 11, i.e., facing the extension section 116. By arranging the introduction section 131 on the wall of the outer tube 11, the pipeline connected with the introduction section 131 can be spaced from the first end of the outer tube 11, so as to reduce the interference between the pipeline and the outer tube 11 and the member to be sucked. Moreover, the volume occupied by the conduit 13 in the contraction section 114 can be reduced, so that the contraction section 114 can suck more gas.

[0071] In some embodiments, referring to Figure 2 , the ejection section 132 partially overlaps the axis of the contraction section 114. Namely, the ejection section 132 is arranged close to the axis of the contraction section 114, so as to increase the gas suction efficiency of the gas ejection device 1. Further, the axis of the ejection section 132 overlaps the axis of the contraction section 114, so as to sufficiently increase the gas suction efficiency of the gas ejection device 1.

[0072] In some embodiments, referring to Figure 2 , the port of the conduit 13 located in the inner tube 12 has an ejection direction parallel to the first direction X. For example, the axis of the ejection section 132 is parallel to the first direction X. Thus, when the gas is ejected from the ejection section 132, the flow direction of the gas flow points to the extension section 116, and the gas flow ejected from the ejection section 132 does not need to change the flow direction in the extension section 116, so as to reduce the energy loss of the gas.

[0073] In some embodiments, referring to Figure 2, the introduction section 131 extends along the radial direction of the contraction section 114, and the conduit 13 is partially curved to connect to the introduction section 131. Exemplarily, the conduit 13 further comprises a curved section 133, the curved section 133 is in the shape of an elbow pipe, and the curved section 133 connects the introduction section 131 and the ejection section 132. It can be understood that the angle between the axis of the introduction section 131 and the axis of the ejection section 132 is a right angle, and when the gas directly enters the ejection section 132 from the introduction section 131, a large amount of energy of the gas will be lost. By smoothly connecting the introduction section 131 and the ejection section 132 through the curved section 133 in the shape of an elbow pipe, the energy loss of the gas can be reduced.

[0074] In some embodiments, referring to Figure 2 , the curved section 133 smoothly connects the introduction section 131 and the ejection section 132. The smooth connection means that the tangents of the axes at both ends of the curved section 133 are parallel to the axes of the introduction section 131 and the ejection section 132 respectively, and the axis of the curved section 133 is a curve. For example, the axis of the curved section 133 is an arc, a parabola, an elliptical arc, etc. Preferably, the axis of the curved section 133 is an arc, which sufficiently reduces the energy loss of the gas.

[0075] In some embodiments, referring to Figure 2 , the introduction section 131 comprises a narrowing part 1311. It can be understood that the gas flow direction of the introduction section 131 is towards the axis of the contraction section 114, so that the inner diameter of the narrowing part 1311 gradually decreases in the direction towards the axis of the contraction section 114. By providing the narrowing part 1311, the cross-sectional area through which the gas flows becomes smaller, thereby increasing the flow rate of the gas flow.

[0076] In some embodiments, referring to Figure 2 , the gas injection device 1 further comprises a first joint 14, the first joint 14 is arranged on the outer wall of the contraction section 114, and the first joint 14 is in fluid communication with the conduit 13. Exemplarily, both ends of the first fluid passage 112 are in fluid communication with the first joint 14 and the conduit 13 respectively. The first joint 14 is used to connect a pipeline, so as to facilitate the fluid communication between the conduit 13 and an external gas source.

[0077] In some embodiments, referring to Figure 4 , the gas injection device 1 further comprises a second joint 15, the second joint 15 is arranged on the outer wall of the contraction section 114, and the second joint 15 is in fluid communication with the gas chamber a. Exemplarily, both ends of the second fluid passage 113 are in fluid communication with the second joint 15 and the gas chamber a respectively. The second joint 15 is used to connect a pipeline, so as to facilitate the fluid communication between the gas chamber a and an external gas source.

[0078] As an application scenario of the above-mentioned gas injection device 1, referring to Figure 2The embodiment of the present application provides a ventilation system 100, which comprises a gas injection device 1, a ventilation mat 2, a gas source 3 and a controller 4. The gas source 3 is used for providing continuous gas flow, for example, an air compressor can provide compressed air. The first fluid channel 112 of the gas injection device 1 is in fluid communication with the gas source 3, for example, the first joint 14 is in fluid communication with the gas source 3, when the gas source 3 delivers gas to the first joint 14, negative pressure is formed in the gas injection device 1, so that one end of the gas injection device 1 can inhale gas and the other end can exhaust gas. One end of the gas injection device 1 is in fluid communication with the ventilation mat 2, so that the ventilation mat 2 can be blown or sucked. The controller 4 is arranged in the gas path between the gas source 3 and the first fluid channel 112, and the controller 4 is used for controlling the on-off of the gas path between the gas source 3 and the first fluid channel 112, that is, whether the gas is supplied to the first fluid channel 112, for example, the controller 4 is arranged on the pipeline between the gas source 3 and the first fluid channel 112, and the controller 4 can be a solenoid valve or include a plurality of solenoid valves. Since the gas injection device 1 can generate larger output gas flow with smaller input gas flow, the ventilation effect of the ventilation system 100 is enhanced, and the ventilation effect includes the blowing effect and the suction effect of the ventilation mat 2.

[0079] It should be noted that the ventilation system 100 described above includes the ventilation mat 2, the gas source 3 and the controller 4, which is only used as an example to illustrate the application scenario of the gas injection device 1, and the ventilation system 100 can also not include the ventilation mat 2, the gas source 3 and the controller 4, or the ventilation system 100 includes another gas flow distribution device, gas flow input device or gas flow output device.

[0080] In some embodiments, the gas chamber a is in fluid communication with the gas source 3. For example, the second joint 15 is in fluid communication with the gas source 3. The single gas source 3 is used to supply gas to the conduit 13 and the gas chamber a, so that the number of gas sources 3 is reduced and the production cost is reduced. Wherein, the controller 4 is also arranged in the gas path between the gas source 3 and the second fluid channel 113, and the controller 4 is also used for controlling the on-off of the gas path between the gas source 3 and the second fluid channel 113.

[0081] In some embodiments, the controller 4 independently controls the on-off of the gas path between the gas source 3 and the first fluid channel 112 and the second fluid channel 113, respectively. For example, the first fluid channel 112 and the second fluid channel 113 are respectively in fluid communication with the controller 4 through pipelines. In other embodiments, the controller 4 is used for simultaneously controlling the on-off of the gas path between the gas source 3 and the first fluid channel 112 and the second fluid channel 113. For example, refer to Figure 4 , the first joint 14 and the second joint 15 are in fluid communication with the controller 4 through the same pipeline, so that the controller 4 synchronously controls the gas supply to the conduit 13 and the gas chamber a.

[0082] For the ventilation mat 2 described above, refer to Figure 5 andFigure 4 The ventilation pad 2 comprises a sealing sleeve 21 and a gas-permeable layer 22. The sealing sleeve 21 is provided with a plurality of first ventilation holes 211 on one side, and a plurality of second ventilation holes 212 on the other side. The gas-permeable layer 22 is arranged in the sealing sleeve 21, and the outer tube 11 of the gas injection device 1 is connected to the second ventilation holes 212. The number of the second ventilation holes 212 can also be one, i.e. the sealing sleeve 21 is provided with at least one second ventilation hole 212. The gas-permeable layer 22 is grid-shaped, so that the airflow can flow inside the gas-permeable layer 22, and has a certain supporting force, which will not block the fluid passage when the sealing sleeve 21 is pressed.

[0083] In some embodiments, referring to Figure 4 The ventilation pad 2 is applied to a seat. For example, the ventilation pad 2 is installed on the seat to dissipate heat from the seat. The first ventilation holes 211 are directed to a seating space of the seat, which is used for a seated person to sit. When the first ventilation holes 211 inhale or blow air, the air around the seated person can be taken away, thereby dissipating heat from the seating space. The ventilation pad 2 is arranged in the seat, or is a part of the seat. When the first ventilation holes 211 inhale or blow air, the seat is also cooled at the same time.

[0084] It should be noted that the seat usually has a plurality of sub-zones, such as a seat part, a back part, an armrest part, a leg part, and a head part, which correspond to the body parts of the seated person respectively. The seat part is used to support the buttocks and thighs of the seated person, the back part is used for the seated person to lean on, the armrest part is used to support the arms of the seated person, the leg part is used for the seated person to lean on, and the head part is used for the seated person to lean on.

[0085] The seating space not only includes a semi-enclosed space surrounded by the seat part and the back part of the seat, but also includes the space in which the seated person moves when sitting on the seat. For example, it includes the space around the legs of the seated person, the space in which the arms of the seated person can move, and the space in which the head of the seated person can move.

[0086] In some embodiments, the plurality of first ventilation holes 211 includes a plurality of first ventilation holes 211 with different shapes and sizes, thereby having different air inhaling and blowing effects. For example, one of the first ventilation holes 211 on the sealing sleeve 21 is circular, another one is rectangular, and another one is triangular, etc. For example, the sealing sleeve 21 has a plurality of circular first ventilation holes 211, one of which has a diameter of 1 cm, another one has a diameter of 2 cm, and another one has a diameter of 3 cm, etc.

[0087] In some embodiments, the number of the first vent holes 211 is greater than the number of the second vent holes 212. That is, the vent pad 2 has the effect of shunting, which is conducive to forming a larger number of air suction or blowing ports in the seat, and improving the uniformity of air blowing or suction of the seat to the seated person.

[0088] The second vent holes 212 are arranged opposite to the first vent holes 211, that is, the first vent holes 211 and the second vent holes 212 are respectively located on opposite sides of the vent pad 2, for example, are arranged on opposite sides of the vent pad 2 along the thickness direction, so that the gas passes through the vent pad 2 in one direction, which is conducive to reducing the resistance of the gas in the vent pad 2, reducing the energy loss of the gas, and improving the heat dissipation effect of the seat. In this embodiment, the first vent holes 211 and the second vent holes 212 are respectively located on opposite sides of the vent pad 2 along the thickness direction, which is conducive to shortening the path length of the gas flowing in the vent pad 2, reducing the energy loss of the gas.

[0089] In some embodiments, referring to Figure 5 and Figure 5 , the vent pad 2 is flat, so as to be conveniently covered on the frame of the seat or arranged in the seat, and reduce the influence on the size of the seat. The vent pad 2 can directly serve as the covering layer of the seat, which can reduce the resistance of the original covering layer of the seat to ventilation, and also can reduce the size of the seat. Alternatively, the vent pad 2 is in the shape of a rectangular sheet. Alternatively, the vent pad 2 is adapted to the shape of the covering layer on the seat, so as to directly replace the original covering layer of the seat.

[0090] In some embodiments, the sealing sleeve 21 has elasticity or plasticity, and when the seated person sits on the seat and exerts pressure on the sealing sleeve 21, the sealing sleeve 21 can be deformed, so as to improve the comfort of the seated person. The sealing sleeve 21 can be made of leather, artificial leather, plastic, rubber, and silicone, etc.

[0091] It should be noted that when the sealing sleeve 21 is subjected to air suction or blowing, the sealing sleeve 21 will expand or shrink due to the change of the air pressure in the sealing sleeve 21, which affects the shape of the seat and the comfort of the seated person. The air-permeable partition 22 is supported in the vent pad 2, and when the sealing sleeve 21 is subjected to air suction, the air-permeable partition 22 can support the sealing sleeve 21, and improve the problem of shrinkage of the sealing sleeve 21. The air-permeable partition 22 can be bonded to the inner wall of the sealing sleeve 21, and when the sealing sleeve 21 is subjected to air blowing, the air-permeable partition 22 can pull the sealing sleeve 21, and improve the problem of expansion of the sealing sleeve 21. Alternatively, the air-permeable partition 22 can be made of plastic, metal, etc., and has a certain strength and elasticity, which can improve the problems of easy collapse and too high hardness of the vent pad 2, and reduce the comfort of the seat.

[0092] In some embodiments, referring to Figure 5 Figure 5 Figure 5 Figure 5 Figure 5 Figure 5 Figure 5 Figure 5 Figure 5 Figure 5 Figure 5 Figure 5 Figure 5 Figure 5 Figure 5 Figure 5 Figure 5 Figure 5 Figure 5 Figure 5 Figure 5 Figure 5 Figure 5 Figure 5 Figure 5 Figure 5The air-permeable partition 22 is provided with air passages 221 along the thickness direction, and the air passages 221 are arranged along the length direction and the width direction of the air-permeable partition 22. The air can pass through the air-permeable partition 22 along the thickness direction, reducing the air resistance of the air-permeable partition 22 and reducing the energy loss of the air.

[0093] The air-permeable partition 22 is provided with air passages 221 along the thickness direction, and the air passages 221 are arranged along the length direction and the width direction of the air-permeable partition 22. The air can pass through the air-permeable partition 22 along the thickness direction, reducing the air resistance of the air-permeable partition 22 and reducing the energy loss of the air.

[0094] In some embodiments, the ventilation system 100 includes a plurality of air injection devices 1, the sealing sleeve 21 is provided with a plurality of second ventilation holes 212, and the outer pipes 11 of the plurality of air injection devices 1 are one-to-one connected to the plurality of second ventilation holes 212. That is, each air injection device 1 is in fluid communication with a second ventilation hole 212, and the plurality of air injection devices 1 are in fluid communication with a single ventilation pad 2, thereby enhancing the heat dissipation effect of the ventilation pad 2. Among them, the air injection device 1 can have multiple models, and different models of air injection devices 1 have different shapes and / or sizes, thereby having different air suction and blowing effects. The plurality of air injection devices 1 connected to the same ventilation pad 2 can include multiple models, that is, a ventilation pad 2 is installed with air injection devices 1 of multiple models.

[0095] In some embodiments, the controller 4 is in fluid communication with the plurality of air injection devices 1, and the controller 4 is used to independently control the opening and closing of the air path between the gas source 3 and any one air injection device 1. Thus, the air flow of the ventilation pad 2 can be controlled, and the heat dissipation intensity of the seat can be controlled. For example, according to the different ventilation gear needs of the occupant seated on the seat, a corresponding number of air injection devices 1 can be controlled to suck or blow air to the ventilation pad 2, thereby adjusting the air suction or blowing intensity of the ventilation pad 2 to the occupant, that is, controlling the heat dissipation intensity of the seat.

[0096] In some embodiments, the port where the outer tube 11 and the inner tube 12 are sealingly connected is connected to the second vent hole 212. That is, the contraction section 114 is in fluid communication with the first vent hole 211 through the second vent hole 212, so as to suck away the gas near the first vent hole 211, suck away the gas of the seating space, and dissipate heat from the seating space and the seat. The heat dissipation by suction is conducive to improving the comfort of the seated person compared to blowing.

[0097] As an application scenario of the gas injection device 1 or the ventilation system 100 described above, the embodiments of the present application further provide a seat (not shown), which comprises the gas injection device 1, at least one of the seat part, the back part, the armrest part, the leg part and the head part of the seat is provided with the ventilation pad 2, and the first vent hole 211 faces the seating space of the seat. The ventilation system 100 has enhanced ventilation effect, and improves the problems of poor heat dissipation effect, low heat dissipation efficiency and inability to rapidly cool the seat of the seat. Moreover, the gas injection device 1 can reduce the demand for the gas flow of the conduit 13, so the gas output flow and the gas flow rate of the gas source 3 can be appropriately reduced, the noise of the seat can be reduced, and the energy consumption of the gas source 3 can be reduced.

[0098] As an application scenario of the gas injection device 1 described above, the embodiments of the present application further provide a hair dryer (not shown), which comprises the gas injection device 1. The gas injection device 1 can generate a larger output gas flow with a smaller input gas flow, increase the output gas flow of the hair dryer, and thus enhance the wind power and / or increase the air volume of the hair dryer.

[0099] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; under the idea of the present application, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes of different aspects of the present application as described above, which are not provided in detail for simplicity; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A gas injection device, comprising: an outer tube and an inner tube located inside the outer tube, a larger end of the inner tube having a larger inner diameter than a smaller end of the inner tube, one end of the outer tube being sealingly connected to the larger end of the inner tube, a portion of an inner wall of the outer tube and the inner tube forming a gas chamber, another portion of the inner wall of the outer tube having a Coanda surface, the Coanda surface and an outer wall of the inner tube corresponding to the smaller end of the inner tube forming a slit, the slit allowing the gas chamber to be in fluid communication with an outside of the outer tube, the outer tube having at least one first fluid passage for introducing a fluid source and at least one second fluid passage for introducing a fluid source, the first fluid passage being in fluid communication with one end of a conduit, the other end of the conduit extending through a side wall of the inner tube and to the smaller end of the inner tube or out of the inner tube, the second fluid passage being in fluid communication with the gas chamber.

2. The gas injection device of claim 1, wherein: the outer tube comprises a converging section, a throat section and an extended section connected in sequence in a first direction, the converging section and the inner tube forming the gas chamber, a portion of the inner wall of the converging section near the throat section having the Coanda surface.

3. The gas injection device of claim 2, wherein: the extended section is tapered, the smaller end of the extended section being joined to the throat section.

4. The gas injection device of claim 1, wherein: the gas chamber is annular, the gas chamber surrounding the conduit.

5. The gas injection device of claim 2, wherein: a port exit direction of the conduit inside the inner tube is parallel to the first direction.

6. The gas injection device of claim 1, wherein: an inner diameter of the inner tube gradually decreases from the larger end of the inner tube to the slit, an inner diameter of the inner wall of the inner tube corresponding to the slit gradually increases. comprising: the gas injection device of any one of claims 1 to 6; a gas source in fluid communication with the first fluid passage and the second fluid passage, respectively; a ventilation pad comprising a sealing sleeve and a gas permeable layer, a plurality of first ventilation holes being provided on one side of the sealing sleeve, a second ventilation hole being provided on another side of the sealing sleeve, the gas permeable layer being provided in the sealing sleeve, a port of the outer tube sealingly connected to the inner tube being butted against the second ventilation hole; a controller provided in a gas path between the gas source and the first fluid passage and the second fluid passage, the controller being configured to independently control opening and closing of the gas path between the gas source and the first fluid passage and the second fluid passage, respectively.

8. The ventilation system of claim 7, wherein: the ventilation system comprises a plurality of the gas injection devices, the sealing sleeve is provided with a plurality of the second ventilation holes, the outer tubes of the plurality of the gas injection devices being butted against the plurality of the second ventilation holes, respectively.

7. A ventilation system, characterized in that 9. A seat, comprising: ​ ​ ​ ​ ​ ​ ​ The ventilation system according to claim 7 or 8, at least one of a seat portion, a back portion, an armrest portion, a leg portion, and a head portion of the seat is provided with the ventilation pad, and the first ventilation hole faces a seating space of the seat.

10. A hair dryer characterized by The gas injection device according to any one of claims 1 to 6.

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