Ventilation device, ventilation system and ventilation method

Abstract

This invention relates to a ventilation device, ventilation system, and ventilation method for providing compensating gas to enable the ventilation device to meet ventilation volume requirements. The ventilation device of this invention includes a ventilation conduit and a valve body disposed on the ventilation conduit. When the pressure in the ventilation conduit is lower than the external pressure, indicating that there may be compression at some point in the ventilation conduit, the converging section opens. The connecting section and the converging section then form a second passage for providing compensating gas to the ventilation conduit. Thus, compensating gas can be provided to the ventilation conduit through the second passage. Therefore, gas can be provided simultaneously through the first and second passages, ensuring that the ventilation volume of the ventilation conduit does not decrease due to compression, thereby guaranteeing that the ventilation volume requirements are met.

Description

Technical Field

[0001] This invention relates to the field of ventilation system technology, and particularly to a ventilation device, ventilation system and ventilation method. Background Technology

[0002] Ventilation masks provide ventilation gas to users and are generally divided into four types: nasal masks that only cover the nose, oral masks that only cover the mouth, oral-nasal masks that cover both the mouth and nose (also known as full-face masks), and nasal pad masks that are inserted into the nostrils.

[0003] The mask system is worn on the face, and the headband assembly positions the system in a relatively comfortable position on the face, ensuring comfort and facilitating the system's therapeutic and restorative functions. The headband assembly is the main component connecting the mask system to the head. Due to significant individual head variations, the headband assembly needs to offer good comfort, a snug fit, and sufficient adaptability. Therefore, a well-designed headband structure allows most patients wearing the mask to achieve a comfortable and well-sealed experience.

[0004] In recent years, the headband components used in nasal pad masks have evolved from traditional fabric to ventilation components. That is, the headband components have changed from connecting and positioning the system to becoming air transmission components of the mask system, and also serve as part of the mask system to achieve ventilation. Silicone is the mainstream material.

[0005] Most ventilation headbands are designed for ventilation on both sides (though a few are designed for single-sided ventilation or other asymmetrical ventilation). The connection point to the air source generator is located at the top of the head. Both sides of the headband connect to the mask system, and there is also a separate rear headband for auxiliary connection.

[0006] However, users wearing ventilated masks sleep in various positions, including supine, lateral (possibly bilateral), and even retrograde. Current ventilated headbands cannot guarantee proper functioning in every position. For example, when a user is lying on their side (or retrograde), some airways may be compressed. To ensure comfort, the headband in contact with the user's skin is made of a soft material. Therefore, if the headband's airways are compressed, it will inevitably affect the ventilation volume, thus failing to meet the required ventilation. Summary of the Invention

[0007] This invention provides a ventilation device, ventilation system, and ventilation method for providing compensating gas so that the ventilation device can meet the ventilation volume requirements.

[0008] The present invention provides a ventilation device, including a ventilation conduit and a valve body disposed on the ventilation conduit, the ventilation conduit forming a first passage for providing gas to a user;

[0009] The valve body includes a connecting section communicating with the outside and a converging section connected to the connecting section, the converging section being disposed in the ventilation duct;

[0010] The valve body is configured such that when the pressure in the venting duct is less than the external pressure, the converging section opens, so that the connecting section and the converging section form a second passage for providing compensating gas to the venting duct; and when the pressure in the venting duct is equal to or greater than the external pressure, the converging section closes.

[0011] In one embodiment, the converging segment has an elliptical radial cross-section, and the inner diameter d of the converging segment in the direction of its major axis is... 长 With its inner diameter d in the direction of its minor axis 短 The value of the proportion n ranges from 20 to 100.

[0012] In one embodiment, the inner diameter d of the converging segment in its minor axis direction 短 The value range is 0.1-1.5mm.

[0013] In one embodiment, the inner diameter d of the converging segment in its minor axis direction is used as a reference. 短 The inner diameter d of the convergent segment along its major axis is determined by the ratio n. 长 When, if the inner diameter d 短 If the value of is close to the maximum value in its range, then the value of the ratio n is close to the minimum value in its range; if the inner diameter d 短 If the value of is close to the minimum value in its range, then the value of the ratio n is close to the minimum value in its range.

[0014] In one embodiment, the inner diameter d of the converging segment in its minor axis direction 短 The value is 0.1 mm, and the ratio n is 100; or

[0015] The inner diameter d of the convergent segment along its minor axis 短 The thickness is 1.5 mm, and the ratio n is 20.

[0016] In one embodiment, the hardness of the connecting segment is greater than the hardness of the converging segment; or

[0017] The wall thickness of the connected segment is greater than the wall thickness of the converging segment.

[0018] In one embodiment, the connecting segment is constructed as a columnar structure, one end of the connecting segment is an open structure, and the other end of the connecting segment is connected to the converging segment through a transition segment.

[0019] In one embodiment, the transition segment is constructed as a conical structure with a smooth profile.

[0020] In one embodiment, the converging segment is made of a material with elastic contractile ability.

[0021] In one embodiment, the ventilation duct includes a main pipeline for delivering gas, and the valve body is disposed on the side wall of the main pipeline.

[0022] The number of valve bodies is at least two.

[0023] In one embodiment, the ventilation duct is further provided with a first interface for connecting to a gas source, and the valve body is disposed at the first interface.

[0024] The number of valve bodies is at least one.

[0025] In one embodiment, the valve body is arranged symmetrically about the center of the first interface.

[0026] In one embodiment, the valve body is arranged at equal angles in the circumferential direction of the first interface.

[0027] In one embodiment, the ventilation duct is further provided with a second interface for connecting to a ventilation mask, and the valve body is disposed at the second interface.

[0028] The number of valve bodies is at least one.

[0029] In one embodiment, the valve body and the venting conduit are integrally formed, or the valve body and the venting conduit are connected by a mechanical connection.

[0030] According to a second aspect of the present invention, the present invention provides a ventilation system comprising the ventilation device described above, characterized in that it further comprises an air source and a ventilation mask, wherein the ventilation device is connected to the air source and the ventilation mask respectively.

[0031] According to a third aspect of the present invention, the present invention provides a ventilation method for a ventilation device, comprising the following steps:

[0032] Gas is supplied to the user via a ventilation duct as the primary pathway;

[0033] When the pressure in the ventilation duct is less than the external pressure, the connecting section and the converging section of the valve body on the ventilation duct form a second passage to provide compensating gas into the ventilation duct, and gas is simultaneously provided to the user through the first passage and the second passage.

[0034] When the pressure in the ventilation duct is equal to or greater than the external pressure, the second passage is closed, and gas is supplied to the user through the first passage.

[0035] Compared with the prior art, the advantage of the present invention is that when the pressure in the ventilation duct is less than the external pressure, it indicates that there may be a compression phenomenon at some point in the ventilation duct. At this time, the converging section opens, and the connecting section and the converging section can form a second passage to provide compensating gas to the ventilation duct. Thus, compensating gas can be provided to the ventilation duct through the second passage. Therefore, gas can be provided through the first passage and the second passage at the same time, so that the ventilation volume of the ventilation duct will not be reduced due to compression, thereby ensuring that the ventilation volume requirement is met. Attached Figure Description

[0036] The invention will now be described in more detail with reference to embodiments and the accompanying drawings.

[0037] Figure 1 This is a schematic diagram of wearing a ventilation device in the prior art;

[0038] Figure 2 This is a three-dimensional structural diagram of the valve body in an embodiment of the present invention (viewed from the bottom);

[0039] Figure 3 This is a three-dimensional structural diagram of the valve body in an embodiment of the present invention (viewed from the top);

[0040] Figure 4 This is a top view of the valve body in an embodiment of the present invention;

[0041] Figure 5 This is a bottom view of the valve body in an embodiment of the present invention;

[0042] Figure 6 This is an axial sectional view of the valve body (along the long axis of the converging section) in an embodiment of the present invention;

[0043] Figure 7 This is an axial sectional view of the valve body in an embodiment of the present invention (along the short axis direction of the converging section);

[0044] Figure 8 This is a schematic diagram of the ventilation device in an embodiment of the present invention;

[0045] Figure 9 yes Figure 8 Sectional view at AA;

[0046] Figure 10 This is a schematic diagram showing the position of the valve body on the vent duct in an embodiment of the present invention;

[0047] Figure 11 yes Figure 8 Sectional view at BB;

[0048] Figure 12 yes Figure 8 Sectional view at CC.

[0049] Figure label:

[0050] 1-Air source connection interface; 2-Side head strap; 3-Rear head strap; 4-Ventilation mask;

[0051] 100 - Valve body; 101 - Connecting section; 102 - Converging section; 103 - Transition section; 104 - Opening; 105 - Recess;

[0052] 200 - Ventilation tubing; 201 - First interface; 202 - Second interface; 203 - Connecting tube; 204 - Connector; 205 - Main pipeline. Detailed Implementation

[0053] The invention will now be further described with reference to the accompanying drawings.

[0054] like Figure 1 The diagram illustrates a prior art ventilation device comprising a ventilation mask 4 for connection to a user's nose and / or mouth. Side headbands 2 are connected to both sides of the ventilation mask 4, intersecting at the top of the user's head and connecting to an air source connection interface 1, which can be connected to an air source (not shown). When worn, the side headbands 2 are positioned on either side of the user's cheeks, and a back headband 3 is also connected to the side headbands 2. The back headband 3 extends above the user's ears and provides support and connection at the back of the user's head. The side headbands 2 and / or the back headband 3 have air passageways. Therefore, gas from the air source can reach the ventilation mask 4 through the side headbands 2 and / or the back headband 3 and be introduced into the user's mouth and nose.

[0055] therefore, Figure 1 In the ventilation device shown, when the side headband 2 and / or the back headband 3 are compressed, the ventilation area changes, which affects the amount of gas delivered to the user's nose, causing the ventilation volume to fail to meet the requirements.

[0056] like Figures 2-12 As shown, according to a first aspect of the present invention, the present invention provides a ventilation device that can spontaneously provide compensating gas when the ventilation volume is insufficient, so that the total ventilation volume meets the usage requirements. Therefore, the ventilation device of the present invention will not affect the ventilation volume even when it is compressed.

[0057] Specifically, the ventilation device of the present invention includes a ventilation conduit 200 and a valve body 100 disposed on the ventilation conduit 200. The ventilation conduit 200 forms a first passage for supplying gas (ventilation gas) to the user. Please refer to... Figures 2-7 and Figure 8 The valve body 100 includes a connecting section 101 that communicates with the outside and a converging section 102 that is connected to the connecting section 101. The converging section 102 is disposed in the ventilation duct 200.

[0058] The valve body 100 is configured such that when the pressure in the vent duct 200 is less than the external pressure, the converging section 102 opens, so that the connecting section 101 and the converging section 102 form a second passage to provide compensation gas to the vent duct 200; and when the pressure in the vent duct 200 is equal to or greater than the external pressure, the converging section 102 closes.

[0059] When the pressure inside the ventilation conduit 200 is lower than the external pressure, it indicates that there is a negative pressure within a certain range inside the ventilation conduit 200, which may be due to a portion of the air passage in the ventilation conduit 200 being in a compressed state. In this situation, the ventilation volume of the ventilation conduit 200 will be insufficient. Therefore, in this invention, a valve body 100 capable of automatically providing compensating gas is provided to ensure that the ventilation volume requirements are met. When the internal pressure of the ventilation conduit 200 is lower than the external pressure, its connecting section 101 and converging section 102 form a second passage for providing compensating gas to the ventilation conduit 200. That is, the valve body 100 is open, and external gas can enter the ventilation conduit 200 through the second passage, thereby providing compensating gas to the ventilation conduit 200 and ensuring that the total ventilation volume of the ventilation conduit 200 meets the requirements. When the internal pressure of the ventilation conduit 200 is not lower than the external pressure, it indicates that the first passage of the ventilation conduit 200 can provide sufficient ventilation. At this time, the second passage mentioned above is closed, that is, the valve body 100 is closed, so that the gas cannot flow back in the opposite direction in the valve body 100.

[0060] In other words, the valve body 100 in this invention is based on the principle of one-way gas compensation. With pressure difference as the driving force, when the ventilation duct 200 is squeezed and the ventilation volume is insufficient, the gas can flow from the outside to the inside of the ventilation duct 200, thereby providing compensation gas to the ventilation duct 200, and the gas cannot flow back; thus ensuring that the total ventilation volume of the ventilation duct 200 meets the requirements.

[0061] Specifically, although the bottom end of the converging section 102 (i.e., the end near the ventilation duct 200) is provided with an opening 104 (such as... Figure 4 and Figure 5As shown in the diagram (for ease of understanding, opening 104 is depicted as open), but due to the structural and material properties of the converging section 102, opening 104 is normally closed. When the external pressure of the ventilation duct 200 is higher than the internal pressure, the converging section 102 is subjected to a force from top to bottom, causing it to deform and open under pressure. This opens opening 104, forming a conductive second passage with the connecting section 101. Through this second passage, external gas enters the ventilation duct 200, providing gas compensation. Conversely, when the external pressure of the ventilation duct 200 is equal to or slightly higher than the internal pressure, the bottom of the converging section 102, under pressure and its own restoring force, returns opening 104 to its normally closed state, thus breaking the second passage. In this case, external gas will not enter the ventilation duct 200 through this second passage.

[0062] In some implementations, such as Figures 2-7 As shown, the converging segment 102 is generally a flat structure, which may have an elliptical radial cross-section. More specifically, the inner diameter d of the converging segment 102 along its major axis... 长 With its inner diameter d in the direction of its minor axis 短 The value of the proportion n ranges from 20 to 100. The inner diameter d of the convergent segment 102 along its minor axis... 短 The value range is 0.1-1.5mm.

[0063] Therefore, based on the inner diameter d of the convergent segment 102 in its minor axis direction... 短 The values ​​of and the aforementioned ratio n can be used to determine the inner diameter d of the convergent segment 102 along its major axis. 长 For example, the inner diameter d of the converging segment 102 along its major axis. 长 The value range is 30-100mm.

[0064] Specifically, based on the inner diameter d of the convergent segment 102 in its minor axis direction... 短 The inner diameter d of the convergent segment 102 along its major axis is determined by the ratio n. 长 When, if the inner diameter d 短 If the value of is close to the maximum value in its range, then the value of the proportion n is close to the minimum value in its range; if the inner diameter d 短 If the value of is close to the minimum value in its range, then the value of the proportion n is also close to the minimum value in its range. This method ensures the ventilation area of ​​the second channel, thereby guaranteeing sufficient air intake.

[0065] For example, if the inner diameter d of the convergent segment 102 in its minor axis direction is... 短If the value of is 0.1 mm, then the value of the ratio n can be 100. Therefore, the inner diameter d of the convergent segment 102 along its major axis is... 长 The value is 10mm. If the inner diameter d of the converging segment 102 along its minor axis is... 短 If the value of is 1.5mm, then the value of the ratio n can be 20. Therefore, the inner diameter d of the converging segment 102 along its major axis is... 长 The value is 30mm.

[0066] For example, if the inner diameter d of the convergent segment 102 in its minor axis direction... 短 If the value of is 0.2 mm, then the value of the ratio n can be 80. Therefore, the inner diameter d of the convergent segment 102 along its major axis is... 长 The value is 16mm. If the inner diameter d of the converging segment 102 along its minor axis... 短 If the value of is 1 mm, then the value of the ratio n can be 25. Therefore, the inner diameter d of the convergent segment 102 along its major axis is... 长 The value is 25mm.

[0067] Furthermore, since the connecting section 101 also serves to support and connect the ventilation duct 200, the hardness of the connecting section 101 can be set to be greater than that of the converging section 102. For example, a harder material can be used to form the connecting section 101, while a softer material can be used to form the converging section 102. Alternatively, the wall thickness of the connecting section 101 can be set to be greater than that of the converging section 102, thereby ensuring the supporting function of the connecting section 101 and making the converging section 102 easier to deform, making the second passage easier to open.

[0068] The connecting segment 101 is constructed as a columnar structure; for example, its radial cross-section can be circular. One end of the connecting segment 101 is an open structure (e.g., Figure 6 The upper end (as shown) is used for communication with the outside. The other end of the connecting segment 101 is connected to the converging segment 102 via the transition segment 103. Figure 2 , Figure 6 and Figure 7 As shown, the transition section 103 is constructed as a cone-shaped structure with a smooth profile, and the transition section 103 can guide the airflow.

[0069] like Figure 6 and Figure 7 As shown, the valve body 100 is formed as a whole into a symmetrical structure in the long axis and short axis directions of the convergence section 102, which is conducive to forming a uniform second passage to facilitate the compensation of gas flow.

[0070] The converging section 102 is made of a material with elastic contraction capability, such as silicone. This ensures that the converging section 102 can easily deform under external pressure from the ventilation duct 200, allowing the opening 104 at its bottom end to open smoothly.

[0071] In addition, such as Figure 6 and Figure 7 As shown, the upper end of the connecting section 101 is a flange end, which can be connected to the vent duct 200. Furthermore, a recess 105 is provided on the outer wall of the connecting section 101, which can engage with the vent duct 200 for secure fixing. Alternatively, a sealing component can be provided in the recess 105 to ensure a sealed connection between the valve body 100 and the vent duct 200.

[0072] The connection points between the connecting section 101, the transition section 103, and the converging section 102 are all equipped with rounded corner structures, so that the three are connected in a smooth transition manner to form a whole, so as to facilitate the flow of gas.

[0073] As described above, gas compensation can be automatically provided under the action of the pressure difference inside and outside the vent duct 200. Therefore, the gas compensation achieved by the valve body 100 is related to the position of the valve body 100 on the vent duct 200.

[0074] like Figure 8 In one of the cases shown, please refer to Figure 9 The ventilation duct 200 includes a main pipeline 205 for conveying gas, and a valve body 100 is disposed on the side wall of the main pipeline 205. In this embodiment, since the internal and external pressure difference formed when the ventilation duct 200 is compressed is small, the compensation effect is small. Therefore, the number of valve bodies 100 can be set to at least two, and the total compensation requirement can be met by increasing the number of valve bodies 100.

[0075] like Figure 9 As shown, in this embodiment, the valve body 100 can be connected to the first interface 201 through its connecting section 101, and the transition section 103 and the converging section 102 of the valve body 100 are both disposed inside the vent duct 200.

[0076] In addition, the main pipe 205 can be constructed as a corrugated pipe, which can be stretched and compressed to make its length adjustable, thereby better conforming to the facial features of different users.

[0077] like Figure 8 In another case shown, please combine Figure 10 and Figure 11The ventilation duct 200 is also provided with a first interface 201 for connecting to a gas source. A valve body 100 is located at the first interface 201 to avoid the gas path direction of the main pipeline 205. At least one valve body 100 is provided. In this embodiment, it is preferable that the valve bodies 100 are located on both sides of the axial direction of the ventilation duct 200, and that the valve bodies 100 are symmetrically arranged about the center of the first interface 201. Symmetrical arrangement of the valve bodies 100 avoids the cancellation of airflow or pressure, thus ensuring that the total compensation requirement is met.

[0078] Furthermore, the valve body 100 is arranged at equal angles in the circumferential direction of the first interface 201. For example... Figure 10 As shown, there are four valve bodies 100, which are respectively located at the four corners of the first interface 201, forming a 90° angle between them. Figure 10 The dashed lines shown are symmetrically arranged. Specifically, in Figure 10 The two valve bodies 100 on either side of the dashed line are symmetrically arranged about the dashed line, and... Figure 10 The two valve bodies 100 shown on the dashed line are symmetrically arranged about the dashed line.

[0079] Understandably, the valve body 100 can also adopt other symmetrical arrangements, which will not be elaborated here.

[0080] like Figure 11 As shown, in this embodiment, the valve body 100 can be connected to the first interface 201 through its connecting section 101, and the transition section 103 and the converging section 102 of the valve body 100 are both disposed inside the vent duct 200.

[0081] like Figure 8 In another case shown, please combine Figure 12 The ventilation duct 200 is also equipped with a connecting tube 203 (or head strap) for connecting to a ventilation mask. Figure 8 As shown, the connecting tubes 203 are connected to both sides of the main pipeline 205, and can extend to both sides of the user's cheeks and connect to the ventilation mask.

[0082] A second interface 202 is provided on the connecting pipe 203, and the valve body 100 is disposed at the second interface 202. In this preferred embodiment, since the valve body 100 is closer to the ventilation mask on the user's face and farther from the air source, it is most likely to form a negative pressure when the ventilation duct 200 is squeezed. Therefore, the number of valve bodies 100 can be set to at least one.

[0083] like Figure 12As shown, in this preferred embodiment, not only is the connecting section 101 of the valve body 100 connected to the wall of the connecting pipe 203, but a portion of the transition section 103 of the valve body 100 is also connected to the wall of the connecting pipe 203. The converging section 102 of the valve body 100 is disposed inside the venting duct 200.

[0084] In addition, such as Figure 8 As shown, the connecting tube 203 is also equipped with a connector 204, which is used to connect to the back headband (not shown) of the ventilation device. The back headband extends above the user's ears and provides support and connection at the back of the user's head. See reference [link / reference needed] for details. Figure 1 The headband shown is 3.

[0085] In some alternative configurations, the valve body 100 may be integrally formed with the vent duct 200, for example, the valve body 100 may be integrally formed on the main duct 205 or integrally formed on the first interface 201.

[0086] In other alternatives, the valve body 100 is mechanically connected to the vent duct 200, for example, the valve body 100 is connected to the side wall of the main duct 205 by means of a snap-fit ​​connection or adhesive bonding.

[0087] According to a second aspect of the present invention, a ventilation system is provided, comprising the ventilation device described above, an air source, and a ventilation mask. The ventilation device is connected to the air source and the ventilation mask via a first interface and a second interface, respectively. The ventilation mask is worn on a user's face and provides ventilation gas to the user's mouth and nose.

[0088] Among them, the ventilation mask can be adopted Figure 1 The ventilation mask shown may be used, or other types of ventilation masks may also be used.

[0089] According to a third aspect of the present invention, a ventilation method for a ventilation device is provided, which is based on the principle of unidirectional gas compensation, using pressure difference as the driving force, and automatically provides gas compensation when conditions are met. Specifically, the method includes the following steps:

[0090] S1: Gas is supplied to the user through the ventilation tube 200 as the first passage. At this time, the ventilation gas flows sequentially through the gas source, the ventilation tube 200 and the ventilation mask, and reaches the user's mouth and nose.

[0091] S2: When the pressure in the ventilation duct 200 is lower than the external pressure, for example, if the ventilation duct 200 is compressed at a certain location, a local negative pressure is formed inside the ventilation duct 200. The connecting section 101 and the converging section 102 of the valve body 100 on the ventilation duct 200 form a second passage for providing compensating gas to the ventilation duct 200, and gas is simultaneously provided to the user through the first and second passages. At this time, the ventilation gas flows sequentially through the gas source, the ventilation duct 200, and the ventilation mask, and reaches the user's mouth and nose; on the other hand, external air can directly enter the ventilation duct 200 and reach the user's mouth and nose, thereby providing compensating gas to ensure the total intake volume.

[0092] S3: When the pressure in the ventilation duct 200 is equal to or greater than the external pressure, the second passage is closed, and gas is supplied to the user through the first passage. At this time, the ventilation gas flows sequentially through the gas source, the ventilation duct 200, and the ventilation mask, and reaches the user's mouth and nose.

[0093] It should be noted that the order of steps S1, S2, and S3 is not fixed and can be adjusted as needed. Furthermore, after step S3, the process can return to either step S1 or S2 until the ventilation process is complete.

[0094] Although the invention has been described with reference to preferred embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner as long as there is no structural conflict. The invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A ventilation device, characterized in that, Includes a ventilation conduit and a valve body disposed on the ventilation conduit, the ventilation conduit forming a first passage for supplying gas to a user; The valve body includes a connecting section communicating with the outside and a converging section connected to the connecting section, the converging section being disposed in the ventilation duct; The valve body is configured such that when the pressure in the venting duct is less than the external pressure, the converging section opens, so that the connecting section and the converging section form a second passage for providing compensating gas to the venting duct; and when the pressure in the venting duct is equal to or greater than the external pressure, the converging section closes. The converging section has an opening at one end near the ventilation duct. The converging section is constructed such that the opening is normally closed. When the pressure outside the ventilation duct is higher than the pressure inside, the converging section is subjected to a force from the top to the bottom. The converging section deforms, causing the opening to open under pressure. Thus, the opening and the connecting section form a conductive second passage, through which external gas enters the first passage of the ventilation duct. When the external pressure of the ventilation duct is lower than or equal to the internal pressure, the bottom of the converging section, under the action of pressure and its own restoring force, causes the opening to return to its normally closed state, thereby disconnecting the second passage.

2. The ventilation device according to claim 1, characterized in that, The converging segment has an elliptical radial cross-section, and the inner diameter of the converging segment along its major axis is... d 长 With its inner diameter in the direction of its minor axis d 短 proportion n The value range is 20-100.

3. The ventilation device according to claim 2, characterized in that, The inner diameter of the convergent segment along its minor axis d 短 The value range is 0.1-1.5mm.

4. The ventilation device according to claim 3, characterized in that, Based on the inner diameter of the convergent segment along its minor axis. d 短 and the ratio n Determine the inner diameter of the convergent segment along its major axis. d 长 When, if the inner diameter d 短 If the value of is close to the maximum value in its range, then the ratio n The value of is close to the minimum value in its range; if the inner diameter d 短 If the value of is close to the minimum value in its range, then the ratio n The value of is close to the minimum value in its range.

5. The ventilation device according to claim 3, characterized in that, The inner diameter of the convergent segment along its minor axis d 短 The value is 0.1 mm, and the stated ratio n It is 100; or The inner diameter of the convergent segment along its minor axis d 短 It is 1.5mm, and the ratio is... n It is 20.

6. The ventilation device according to any one of claims 1-5, characterized in that, The hardness of the connecting segment is greater than the hardness of the converging segment; or The wall thickness of the connected segment is greater than the wall thickness of the converging segment.

7. The ventilation device according to any one of claims 1-5, characterized in that, The connecting segment is constructed as a columnar structure, with one end of the connecting segment being an open structure, and the other end of the connecting segment being connected to the converging segment through a transition segment.

8. The ventilation device according to claim 7, characterized in that, The transition section is constructed as a conical structure with a smooth profile.

9. The ventilation device according to claim 7, characterized in that, The converging section is made of a material with elastic contraction capability.

10. The ventilation device according to any one of claims 1-5, characterized in that, The ventilation duct includes a main pipeline for conveying gas, and the valve body is disposed on the side wall of the main pipeline. The number of valve bodies is at least two.

11. The ventilation device according to any one of claims 1-5, characterized in that, The ventilation duct is also provided with a first interface for connecting to a gas source, and the valve body is located at the first interface. The number of valve bodies is at least one.

12. The ventilation device according to claim 11, characterized in that, The valve body is arranged symmetrically about the center of the first interface.

13. The ventilation device according to claim 12, characterized in that, The valve body is set at equal angles in the circumferential direction of the first interface.

14. The ventilation device according to any one of claims 1-5, characterized in that, The ventilation duct is also provided with a second interface for connecting to a ventilation mask, and the valve body is located at the second interface. The number of valve bodies is at least one.

15. The ventilation device according to any one of claims 1-5, characterized in that, The valve body and the venting duct are integrally formed, or the valve body and the venting duct are connected by a mechanical connection.

16. A ventilation system comprising the ventilation device according to any one of claims 1-15, characterized in that, It also includes an air source and a ventilation mask, with the ventilation device connected to the air source and the ventilation mask respectively.

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