Exhaust hole structure of a ventilator mask and ventilator mask

Abstract

This utility model relates to the field of ventilator mask technology, and discloses an exhaust port structure for a ventilator mask and the ventilator mask itself. The exhaust port structure of the ventilator mask includes a curved tube and a mask body. The mask body is connected to the curved tube via a fastener to form a breathing channel. The curved tube is provided with a first densely packed perforated area, which includes multiple spaced-apart first exhaust ports. The first densely packed perforated area and / or the first exhaust ports are provided with a first noise reduction structure. And / or the mask body is provided with a second densely packed perforated area, which includes multiple spaced-apart second exhaust ports. The second densely packed perforated area and / or the second exhaust ports are provided with a second noise reduction structure. Through the integrated design of optimized exhaust port distribution and noise reduction structure, noise is effectively reduced while avoiding the drawbacks of traditional noise reduction devices that increase airflow resistance, thus improving the comfort and applicability of the ventilator mask.

Description

Technical Field

[0001] This utility model relates to the field of ventilator mask technology, and in particular, to an exhaust port structure for a ventilator mask. Furthermore, this utility model also relates to a ventilator mask including the aforementioned exhaust port structure. Background Technology

[0002] A ventilator system typically consists of a ventilator, breathing tubing, and a breathing mask. Its working principle involves the ventilator generating breathable gas, which is then delivered to the body via the breathing tubing and mask. Simultaneously, exhaled waste gas is expelled through vents in the mask or breathing tubing. However, traditional vent designs have certain drawbacks. For example, uneven distribution of vents or improper vent diameter can lead to excessively high local airflow velocities. Furthermore, high-speed airflow passing through small vents can generate turbulent noise, negatively impacting the user experience.

[0003] To address the aforementioned noise problem, existing technologies have proposed several improvements. For example, an exhaust noise reduction device has been disclosed, which reduces noise by adding a noise-reducing structure to the outside of the exhaust port. However, this approach has a significant drawback: the additional noise-reducing structure increases airflow resistance, requiring users to exert extra effort when breathing. For individuals with weaker breathing abilities, such as patients with chronic obstructive pulmonary disease (COPD), this increased respiratory burden may further affect their breathing comfort and even worsen their condition. Utility Model Content

[0004] This utility model provides an exhaust port structure for a ventilator mask and a ventilator mask, which is an improved solution that can effectively reduce exhaust noise without significantly increasing airflow resistance, thereby improving the comfort and applicability of the ventilator system, especially meeting the special needs of users with impaired respiratory function, and solving the technical problem that the exhaust noise of the ventilator mask increases the respiratory burden in order to reduce noise.

[0005] According to one aspect of the present invention, a ventilation port structure for a ventilator mask is provided, comprising a curved tube and a mask body. The mask body is connected to the curved tube by a fastener to form a breathing channel. The curved tube is provided with a first densely packed small hole area, which includes a plurality of spaced-apart first exhaust holes. The first densely packed small hole area and / or the first exhaust holes are provided with a first noise reduction structure. And / or the mask body is provided with a second densely packed small hole area, which includes a plurality of spaced-apart second exhaust holes. The second densely packed small hole area and / or the second exhaust holes are provided with a second noise reduction structure.

[0006] Furthermore, the first exhaust port in the first densely packed small hole area of ​​the bend pipe adopts a first contraction-type hole. The axial direction of the first contraction-type hole is arranged in the same direction as the exhaust direction of the bend pipe, or the first densely packed small hole area and the exhaust airflow channel of the bend pipe are at the same horizontal position. The first contraction-type hole includes a first cylindrical section at the exhaust end and a first conical section at the intake end. The large end of the first conical section is arranged towards the inner cavity of the bend pipe, and the small end of the first conical section is connected to the first cylindrical section to form a first noise reduction structure.

[0007] Furthermore, the radial dimension of the first cylindrical segment is 0.6 mm to 0.7 mm, the axial dimension of the first cylindrical segment is 0.1 mm to 0.3 mm; and / or the angle of the large end air intake position of the first conical segment is set as a first rounded corner, the radius of the first rounded corner is 0.1 mm to 0.3 mm, so as to form a first noise reduction structure.

[0008] Furthermore, the first densely perforated area is arranged in the bending region of the bend pipe, and the first exhaust holes are arranged in an alternating manner in the bending region and symmetrically arranged along the geometric center line in the bending region. The wall thickness of the first densely perforated area is 1.1 mm to 1.3 mm to form the first noise reduction structure.

[0009] Furthermore, the spacing between two adjacent first exhaust holes is 1.4 mm to 1.6 mm.

[0010] Furthermore, the second exhaust port in the second densely perforated area of ​​the cover adopts a second contraction-type hole; the second contraction-type hole includes a second cylindrical section at the air outlet end and a second conical section at the air inlet end, the large end of the second conical section is arranged towards the inner cavity of the bend, and the small end of the second conical section is connected to the first cylindrical section to form a second noise reduction structure.

[0011] Furthermore, the radial dimension of the second cylindrical section is 0.6 mm to 0.7 mm, and the axial dimension of the second cylindrical section is 0.1 mm to 0.3 mm; and / or the angle of the large end air intake position of the second conical section is set as a second rounded corner, and the radius of the second rounded corner is 0.4 mm to 0.6 mm, so as to form a second noise reduction structure; and / or the spacing between two adjacent second exhaust ports is 1.6 mm to 1.8 mm.

[0012] Furthermore, a second dense perforated area is arranged in the upper edge region of the cover, and the second exhaust holes are arranged in an alternating manner in the upper edge region and symmetrically arranged along the geometric center line in the upper edge region; the wall thickness of the second dense perforated area is 1.7 mm to 1.9 mm, so as to form a second noise reduction structure.

[0013] Furthermore, the mask is either a nose mask or an oral-nasal mask.

[0014] According to another aspect of the present invention, a ventilator mask is also provided, which includes the exhaust port structure of the aforementioned ventilator mask.

[0015] This utility model has the following beneficial effects:

[0016] 1. Reduce exhaust noise: The densely arranged small holes can disperse the airflow and prevent local high-speed airflow from concentrating through a single exhaust hole, thereby reducing the generation of turbulent noise; the noise reduction structure further suppresses airflow noise and improves user comfort.

[0017] 2. Maintain low airflow resistance: The design of multiple small holes evenly distributed optimizes the exhaust path, allowing the airflow to be discharged smoothly, avoiding the increase in resistance caused by adding extra noise reduction structures, ensuring smooth breathing, especially suitable for patients with weak breathing capacity.

[0018] 3. Enhanced exhaust uniformity: The synergistic effect of the first and second dense small hole areas allows exhaled air to be evenly discharged in multiple directions through the curved pipe and the cover, avoiding local airflow accumulation, further reducing noise and improving exhaust efficiency.

[0019] 4. Compact structure and easy assembly: The curved tube and the mask are connected by a snap-fit ​​to form a breathing channel, which is simple and reliable; the dense small hole area and noise reduction structure are integrated into the existing components, without the need for additional complex structures, which is convenient for manufacturing and maintenance.

[0020] In addition to the objectives, features, and advantages described above, this utility model has other objectives, features, and advantages. The present utility model will now be described in further detail with reference to the figures. Attached Figure Description

[0021] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0022] Figure 1 This is one of the structural schematic diagrams of the exhaust port structure of the ventilator mask according to a preferred embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the structure of the bent pipe according to a preferred embodiment of the present invention;

[0024] Figure 3 This is a cross-sectional structural diagram of the bent pipe according to a preferred embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the structure of the cover body according to a preferred embodiment of the present utility model;

[0026] Figure 5 This is a cross-sectional structural diagram of the cover body according to a preferred embodiment of the present invention;

[0027] Figure 6This is the second schematic diagram of the exhaust port structure of the ventilator mask according to a preferred embodiment of the present invention;

[0028] Figure 7 A vector graphic representation of a nose mask;

[0029] Figure 8 This is a vector image of a simulated mouth and nose mask.

[0030] Legend:

[0031] 100. Bend; 101. First densely perforated area; 102. First vent; 1021. First cylindrical section; 1022. First conical section; 1023. First rounded corner; 200. Cover; 201. Second densely perforated area; 202. Second vent; 2021. Second cylindrical section; 2022. Second conical section; 2023. Second rounded corner; 300. Snap-fit. Detailed Implementation

[0032] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0033] Figure 1 This is one of the structural schematic diagrams of the exhaust port structure of the ventilator mask according to a preferred embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the bent pipe according to a preferred embodiment of the present invention; Figure 3 This is a cross-sectional structural diagram of the bent pipe according to a preferred embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the cover body according to a preferred embodiment of the present utility model; Figure 5 This is a cross-sectional structural diagram of the cover body according to a preferred embodiment of the present invention; Figure 6 This is the second schematic diagram of the exhaust port structure of the ventilator mask according to a preferred embodiment of the present invention; Figure 7 A vector graphic representation of a nose mask; Figure 8 This is a vector image of a simulated mouth and nose mask.

[0034] like Figure 1 and Figure 6As shown, the exhaust port structure of the ventilator mask in this embodiment includes a curved tube 100 and a mask body 200. The mask body 200 is connected to the curved tube 100 via a fastener 300 to form a breathing channel. The curved tube 100 is provided with a first dense perforation area 101, which includes a plurality of spaced first exhaust ports 102. The first dense perforation area 101 and / or the first exhaust ports 102 are provided with a first noise reduction structure. And / or the mask body 200 is provided with a second dense perforation area 201, which includes a plurality of spaced second exhaust ports 202. The second dense perforation area 201 and / or the second exhaust ports 202 are provided with a second noise reduction structure. The exhaust port structure of this ventilator mask, when only the curved tube 100 is equipped with the first densely packed small hole area 101 and the first noise reduction structure, is suitable for use with a nasal mask. The densely arranged first exhaust holes 102 on the curved tube 100 disperse the exhaled airflow, reducing the single-point airflow velocity and effectively suppressing turbulent noise. The first noise reduction structure is directly integrated into the curved tube 100, achieving noise control without increasing additional airflow resistance. The single-sided exhaust design is suitable for scenarios with strict space requirements for the mask body 200, maintaining the overall compactness of the mask. When only the mask body 200 is equipped with the second densely packed small hole area 201 and the second noise reduction structure, it is suitable for use with an oronasal mask. Utilizing the curved surface characteristics of the mask body 200, the second exhaust holes 202 achieve three-dimensional airflow dispersion, resulting in more comprehensive noise suppression. The second noise reduction structure is integrated with the mask body 200, avoiding the increased breathing impedance caused by traditional external noise reduction devices. The exhaust area is distributed close to the facial contours, conforming to the natural diffusion path of exhaled airflow. When the curved tube 100 and the mask 200 are simultaneously equipped with dense perforation areas and noise reduction structures, the synergistic effect of the first dense perforation area 101 and the second dense perforation area 201 allows exhaled gas to be evenly discharged in multiple directions through the curved tube 100 and the mask 200, avoiding local airflow accumulation, further reducing noise and improving exhaust efficiency. The dual-channel exhaust structure makes airflow diversion more thorough, and the combined effect of the first and second noise reduction structures achieves superimposed attenuation of sound energy. The coordination of the exhaust areas of the curved tube 100 and the mask 200 can adaptively adjust the exhaust efficiency under different breathing intensities. The redundant exhaust design ensures that basic exhaust function can still be maintained when any exhaust channel is abnormal. All of the above solutions achieve the optimal balance between noise control and breathing resistance while ensuring the integrity of the original breathing channel through the synergistic design of "dense perforation areas and integrated noise reduction structures". By optimizing the distribution of exhaust holes and the integrated design of noise reduction structures, noise is effectively reduced while avoiding the defects of traditional noise reduction devices that increase airflow resistance, thus improving the comfort and applicability of the ventilator mask.

[0035] like Figure 2 and Figure 3As shown, in this embodiment, the first exhaust port 102 of the first densely perforated area 101 of the bend 100 adopts a first contraction-type hole. The axial direction of the first contraction-type hole is arranged in the same direction as the air outlet direction of the bend 100, or the first densely perforated area 101 and the air outlet airflow channel of the bend 100 are at the same horizontal position. The first contraction-type hole includes a first cylindrical section 1021 at the air outlet end and a first conical section 1022 at the air inlet end. The large end of the first conical section 1022 is arranged towards the inner cavity of the bend 100, and the small end of the first conical section 1022 is connected to the first cylindrical section 1021 to form a first noise reduction structure. By setting a first contraction-type hole (first exhaust hole 102) with a specific structure in the first densely packed small hole area 101 of the bend 100, and in conjunction with its specific spatial relationship with the airflow direction of the bend 100, the axial direction of the first contraction-type hole is arranged in the same direction as the air outlet direction of the bend 100 (or at the same horizontal position), so that the airflow is smoothly discharged in a preset direction, avoiding disordered scattering of the airflow at the orifice and effectively suppressing the generation of turbulent noise; the large end of the first conical section 1022 faces the inner cavity of the bend 100, forming a gradually narrowing channel, so that the airflow gradually accelerates when passing through, reducing the airflow separation phenomenon; the small end is connected to the first cylindrical section 1021. The system forms a stable section, maintaining uniform airflow velocity and reducing noise caused by sudden changes in flow velocity. The combined structure of the first conical section 1022 and the first cylindrical section 1021 creates a channel with gradually changing acoustic impedance. Through cross-sectional changes, it achieves multiple reflections and interferences of sound waves, enhancing the passive attenuation effect of high-frequency noise. The conical section structure guides the airflow to concentrate and flush the inner wall of the channel, reducing the deposition of condensate or particulate matter in the orifice and maintaining long-term stable exhaust efficiency. The constricted orifice design achieves noise reduction without increasing the overall exhaust resistance, and its axial layout is coordinated with the airflow direction inside the bend 100, avoiding negative impacts on the original respiratory channel fluid performance. Through the synergistic optimization of the orifice structure and spatial layout, a dual improvement is achieved in airflow dynamics and acoustic performance, making it particularly suitable for medical applications that are sensitive to noise and require low breathing resistance.

[0036] like Figure 2 and Figure 3As shown, in this embodiment, the radial dimension a1 of the first cylindrical segment 1021 is 0.6 mm to 0.7 mm, the axial dimension b1 of the first cylindrical segment 1021 is 0.1 mm to 0.3 mm; and / or the angle of the large end air intake position of the first conical segment 1022 is set as a first rounded corner 1023, and the radius e1 of the first rounded corner 1023 is 0.1 mm to 0.3 mm, so as to form a first noise reduction structure. The radial dimension a1 (0.6 mm - 0.7 mm) and axial dimension b1 (0.1 mm - 0.3 mm) of the first cylindrical section 1021 are matched to form a short and precise equal-diameter channel, ensuring that the airflow remains in a laminar state when passing through, avoiding the uneven flow velocity caused by an excessively large orifice or the surge in resistance caused by an excessively small orifice. The large end of the first conical section 1022 is provided with a first rounded corner 1023 (rounded corner radius e1 is 0.1 mm - 0.3 mm) at the air inlet position, eliminating the sharp edge effect of the airflow at the inlet and significantly reducing the airflow velocity. The design effectively reduces vortex noise generated by low airflow separation. The rounded corner structure and the gradually changing cross-section of the conical section work synergistically to achieve a smooth transition of airflow from the inner cavity of the bend 100 to the cylindrical section, further weakening mid-to-high frequency noise components. The size ratio between the first cylindrical section 1021 and the first conical section 1022 ensures noise reduction while maintaining overall exhaust resistance within a physiologically acceptable range (especially for patients with impaired respiratory function). The rounded corner design reduces erosion and wear on the orifice edge caused by airflow, extending the service life of the exhaust port structure. Through size control and local structural optimization, precise regulation of airflow and acoustic performance is achieved at the microscale, resolving the technical contradiction of traditional exhaust port noise reduction and low resistance being difficult to achieve simultaneously.

[0037] like Figure 2 and Figure 3As shown, in this embodiment, the first dense small hole area 101 is arranged in the bending area of ​​the bend pipe 100, the first exhaust hole 102 is arranged in an alternating manner in the bending area and is arranged symmetrically in the bending area with geometric center line, and the wall thickness d1 of the first dense small hole area 101 is 1.1 mm-1.3 mm to form the first noise reduction structure. The bending region, as a point of abrupt change in airflow direction, features a staggered and geometrically symmetrical layout of exhaust ports. This allows for multi-directional flow compensation during the change of direction, preventing turbulent noise caused by local velocity surges. A wall thickness of 1.1 mm to 1.3 mm (d1) forms a specific acoustic impedance matching layer, absorbing low-to-mid-frequency airflow noise through wall vibration damping while avoiding the enhanced sound wave reflection effect caused by excessively thick wall material. A symmetrically staggered arrangement forms a mesh-like reinforcement structure in the stress concentration area of ​​the bending region. Combined with the 1.1 mm to 1.3 mm wall thickness, this meets the deformation resistance requirements under high-frequency airflow impact while maintaining 100° flexibility to adapt to the facial contours. The curved surface characteristics of the bending region enable a three-dimensional spatial distribution of exhaust ports. Within a limited projected area, the staggered arrangement increases the number of effective exhaust ports, improving exhaust efficiency per unit area. The symmetrical layout along the centerline causes interference cancellation of sound waves in the far field, suppressing noise propagation intensity. By coordinating the structural features of the bending area with the spatial topology of the exhaust port, active noise reduction is achieved in the noise-sensitive area of ​​airflow turning, breaking through the limitations of passive noise reduction that traditional masks rely solely on material sound absorption.

[0038] like Figure 2 and Figure 3 As shown, in this embodiment, the spacing c1 between two adjacent first exhaust holes 102 is 1.4 mm to 1.6 mm; and / or the exhaust volume of the first densely packed small hole area 101 is 30 L / min. The hole spacing c1 of 1.4 mm to 1.6 mm forms the optimal airflow interference distance, which smooths the velocity gradient when the jets from adjacent exhaust holes mix with each other, effectively suppressing secondary noise caused by collisions of scattering flows; noise attenuation in a specific frequency band is achieved through phase interference of the sound waves from adjacent holes, which improves the noise reduction effect compared to random spacing layout. The exhaust volume threshold design of 30 L / min matches the peak resting respiratory flow of an adult, ensuring that the expiratory phase airflow can be completely diverted, avoiding the phenomenon of CO2 re-inhalation due to exhaust lag. The parameter coupling of spacing and exhaust volume stabilizes the airflow resistance, thereby meeting the resistance requirements of the medical respiratory mask.

[0039] like Figure 4 and Figure 5As shown, in this embodiment, the second exhaust port 202 of the second dense small hole area 201 of the cover 200 adopts a second shrinkage type hole; the second shrinkage type hole includes a second cylindrical section 2021 at the air outlet end and a second conical section 2022 at the air inlet end. The large end of the second conical section 2022 is arranged towards the inner cavity of the bend 100, and the small end of the second conical section 2022 is connected to the first cylindrical section 1021 to form a second noise reduction structure. By setting a second contracting hole (second exhaust hole 202) in the second densely perforated area 201 of the cover 200, and in conjunction with its specific structural relationship with the airflow direction of the bend 100, the large end of the second conical section 2022 faces the inner cavity of the bend 100, forming a series of gradually narrowing channels with the first contracting hole (first exhaust hole 102), so that the airflow can achieve a velocity gradient transition between the bend 100 and the cover 200, avoiding eddy noise caused by abrupt changes in cross-section; the axial docking of the second cylindrical section 2021 and the first cylindrical section 1021 constitutes a composite acoustic filter, which, through two stages The contraction structure achieves a step-like noise reduction; the distributed layout of the second contraction-type orifices on the curved surface of the cover 200 can automatically adjust the actual exhaust ratio of each orifice according to the breathing intensity, maintaining reduced airflow resistance fluctuations at a calibrated flow rate of 30L / min; the tapered structure of the second conical section 2022 creates a Venturi effect, accelerating the generation of local negative pressure when airflow passes through, guiding condensate back into the inner cavity of the bend 100, reducing the risk of orifice blockage; the rigid connection between the second cylindrical section 2021 and the first cylindrical section 1021 changes the local vibration mode of the cover 200, avoiding structural resonance amplification of noise.

[0040] like Figure 4 and Figure 5As shown, in this embodiment, the radial dimension a2 of the second cylindrical segment 2021 is 0.6 mm-0.7 mm, and the axial dimension b2 of the second cylindrical segment 2021 is 0.1 mm-0.3 mm; and / or the angle of the large end air intake position of the second conical segment 2022 is set as a second rounded corner 2023, and the radius e2 of the rounded corner 2023 is 0.4 mm-0.6 mm, to form a second noise reduction structure; and / or the distance c2 between two adjacent second exhaust holes 202 is 1.6 mm-1.8 mm. The matching of the radial dimension a2 (0.6 mm-0.7 mm) and the axial dimension b2 (0.1 mm-0.3 mm) of the second cylindrical segment 2021 forms a precise short-channel structure, ensuring that the airflow remains in a laminar state when passing through, avoiding the generation of turbulent noise, while maintaining low airflow resistance. The radius e2 (0.4mm-0.6mm) of the second rounded corner 2023 optimizes airflow inlet conditions, eliminates sharp edge effects, and significantly reduces airflow separation noise. The larger radius e2 of the second rounded corner 2023 (0.4mm-0.6mm compared to the 0.1mm-0.3mm of the first rounded corner 1023) adapts to the curved surface characteristics of the enclosure 200, reducing sound wave reflection through a smooth transition and enhancing the attenuation effect of mid-to-low frequency noise. The spacing c2 (1.6mm-1.8mm) between adjacent second exhaust holes 202 and the spacing c1 (1.4mm-1.6mm) between the first densely packed small hole area 101 creates a differentiated layout, disrupting noise coherence and further reducing the overall sound pressure level. The spacing c2 (1.6mm-1.8mm) balances exhaust uniformity with space utilization, achieving uniform airflow distribution at an exhaust volume of 30L / min and avoiding localized airflow accumulation. The parametric design of the second constriction orifice complements the first constriction orifice: a larger rounded corner (e2>e1) adapts to the curved airflow characteristics of the shroud 200, while a slightly larger spacing (c2>c1) compensates for the influence of the curvature of the shroud 200 on airflow distribution, thus optimizing the exhaust performance of the bend 100 and the shroud 200.

[0041] like Figure 4 and Figure 5As shown, in this embodiment, the second dense perforation area 201 is arranged along the upper edge of the cover 200, and the second exhaust holes 202 are arranged in a staggered manner along the upper edge and symmetrically along the geometric center line. The wall thickness d2 of the second dense perforation area 201 is 1.7 mm to 1.9 mm to form a second noise reduction structure; and / or the exhaust volume of the second dense perforation area 201 is 30 L / min. The special layout of the upper edge area, combined with the staggered symmetrical arrangement, allows the exhaled airflow to diffuse naturally upwards, avoiding direct impact on the user's face or rebound to the visual area, while utilizing gravity to reduce condensation retention. The wall thickness d2 of 1.7 mm to 1.9 mm creates a resonant cavity effect, generating active sound absorption, which improves the noise attenuation compared to thin-walled structures. The thickened upper edge (d2 is 1.7mm-1.9mm) is mechanically matched with the 200mm headband tension direction of the mask, resisting repeated bending stress during wear while maintaining the overall lightweight design. The 30L / min exhaust volume setting precisely matches the peak expiratory flow rate in a supine position, ensuring that CO2 respiration is avoided in various body positions. The upper exhaust creates a "chimney effect," accelerating the expulsion of hot and humid air while avoiding the neck dampness and discomfort caused by traditional lower exhaust systems.

[0042] In this embodiment, the cover 200 is a nose mask or a mouth and nose mask.

[0043] like Figure 1 and Figure 6 As shown, the ventilator mask of this embodiment includes the exhaust port structure of the ventilator mask described above.

[0044] In practice, a ventilation port structure for a ventilator mask is provided, including a mask body 200, a support, a bend 100, and a tubing connector. The mask body 200 and the support are connected to the bend 100 via a fastener 300. Similarly, the bend 100 is connected to the tubing connector via a fastener 300, thus forming a complete breathing channel. Exhaled waste gas is discharged to the outside through the ventilation port structure on the mask body 200 or the bend 100. The ventilation port adopts a constricting conical orifice, where the airflow is accelerated in the constriction section, the flow cross-section gradually decreases, and the flow velocity increases, but the flow direction is consistent with the pressure gradient direction, reducing flow separation and vortex formation. This acceleration process can suppress the generation of turbulence, thereby reducing noise caused by turbulent stress tensor.

[0045] Depending on the shape of the mask, the exhaust structure can be set on the bend 100 or the mask body 200, and is divided into bend exhaust port (first exhaust port 102) and mask body exhaust port 1.1 (second exhaust port 202).

[0046] The curved tube exhaust port (first exhaust port 102) is used on a nasal mask. Its mask body 200 only covers the nasal area and does not cover the mouth area. Its mask body 200 has a relatively small area and is too close to the face. The exhaust port cannot be placed directly on the mask body 200. Therefore, the exhaust port is usually placed on the curved tube 100.

[0047] The axial direction of the vent hole (first vent hole 102) of the bent pipe is at the same level as the air outlet direction of the bent pipe 100.

[0048] according to Figure 2 As shown, the curved exhaust ports (first exhaust port 102) are staggered in the bending area of ​​the curved pipe 100 and are symmetrical with the geometric center line of the curved pipe 100. The small end diameter a1 ranges from 0.6 mm to 0.7 mm, and the small end exhaust is cylindrical. The cylindrical vertical structure can guide the airflow to be discharged vertically, reduce the mixing of turbulence with the surrounding gas, and prevent the exhaled carbon dioxide from being re-inhaled into the mask due to airflow turbulence. The length b1 of the cylindrical vertical structure ranges from 0.1 mm to 0.3 mm.

[0049] The distance c1 between the curved pipe exhaust hole (first exhaust hole 102) and the hole is 1.4 mm to 1.6 mm.

[0050] The wall thickness d1 of the curved exhaust port (first exhaust port 102) ranges from 1.1 mm to 1.3 mm. The appropriate wall thickness can simultaneously shield the noise inside the cover 200 and reduce the noise generated during exhaust.

[0051] The large end of the curved exhaust port (first exhaust port 102) has a rounded corner, with the rounded corner e1 ranging from 0.1 mm to 0.3 mm. The exhaust port intake end adopts a transition rounded corner: the rounded corner can reduce the risk of airflow separation, make the airflow turn smoothly, reduce vortex shedding and pressure pulsation, and achieve the technical effect of noise reduction.

[0052] The exhaust port (second exhaust port 202) of the mask body is suitable for the mouth and nose mask, and its mask body 200 covers the mouth and nose at the same time. The exhaust port can be placed directly on the mask body 200.

[0053] according to Figure 4 As shown, the exhaust holes (second exhaust holes 202) of the cover are staggered along the upper edge of the cover 200 and are symmetrical about the geometric center line of the cover 200. The diameter a2 of the small end hole is 0.6 mm to 0.7 mm, the exhaust at the small end is cylindrical, and the length b2 of the cylindrical structure is 0.1 mm to 0.3 mm.

[0054] The distance c2 between the exhaust vent (second exhaust vent 202) and the vent is 1.6 mm to 1.8 mm.

[0055] The wall thickness d2 of the exhaust port (second exhaust port 202) of the cover is in the range of 1.7 mm to 1.9 mm. The appropriate wall thickness can simultaneously shield the noise inside the cover 200 and reduce the noise generated during exhaust.

[0056] The large end of the exhaust port (second exhaust port 202) of the cover has a rounded corner, and the rounded corner e2 ranges from 0.4 mm to 0.6 mm.

[0057] Example 1:

[0058] The nasal mask exhaust port has a small end diameter of 0.65 mm, a hole spacing of 1.5 mm, and 43 openings. The oral and nasal mask exhaust port has a small end diameter of 0.66 mm, a hole spacing of 1.75 mm, and 47 openings.

[0059] Comparative Example 1:

[0060] The nasal mask exhaust port has a small end diameter of 0.82 mm, a hole spacing of 0.7 mm, and 27 openings. The oral and nasal mask exhaust port has a small end diameter of 0.77 mm, a hole spacing of 1.4 mm, and 35 openings.

[0061] The noise volume integral for different exhaust port designs at a flow rate of 30 L / min is shown in the table below:

[0062]

[0063] In simulation (e.g.) Figure 7 , Figure 8 As shown), the parameters of the nasal mask and oronasal mask exhaust holes in Example 1 are all within the scope of this utility model, while the parameters of the nasal mask and oronasal mask exhaust holes in Comparative Example 1 are not within the scope of this utility model. The exhaust holes in Comparative Example 1 have larger diameters and are more densely arranged, but the opening area of ​​the exhaust holes in both schemes is kept the same. When the exhaust flow rate is 30L / min, the internal flow field noise and external flow field noise are calculated. The exhaust noise of Comparative Example 1 is significantly higher than that of Example 1.

[0064] Any matters not covered in this utility model are common knowledge.

[0065] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0066] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

[0067] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An exhaust hole structure of a respirator mask, comprising an elbow (100) and a mask body (200), the mask body (200) is connected with the elbow (100) through a buckle (300), forming a breathing channel, characterized in that, The bend (100) is provided with a first densely perforated area (101), the first densely perforated area (101) including a plurality of spaced first vent holes (102), the first densely perforated area (101) and / or the first vent holes (102) are provided with a first noise reduction structure; and / or The cover (200) is provided with a second dense perforated area (201), the second dense perforated area (201) includes a plurality of second exhaust holes (202) arranged at intervals, and the second dense perforated area (201) and / or the second exhaust holes (202) are provided with a second noise reduction structure.

2. The vent structure for a mask of a breathing apparatus according to claim 1, wherein, The first exhaust port (102) of the first dense small hole area (101) of the bend (100) adopts the first shrinkage type hole. The axial direction of the first shrinkage type hole is arranged in the same direction as the air outlet direction of the bend (100), or the first dense small hole area (101) and the air outlet airflow channel of the bend (100) are at the same horizontal position. The first constriction orifice includes a first cylindrical section (1021) at the outlet end and a first conical section (1022) at the inlet end. The large end of the first conical section (1022) is arranged towards the inner cavity of the bend (100), and the small end of the first conical section (1022) is connected to the first cylindrical section (1021) to form a first noise reduction structure.

3. The vent structure for a mask of a breathing apparatus according to claim 2, wherein, The radial dimension of the first cylindrical segment (1021) is 0.6 mm-0.7 mm, and the axial dimension of the first cylindrical segment (1021) is 0.1 mm-0.3 mm; and / or The large end air intake position of the first conical section (1022) is set to a first rounded corner (1023), and the radius of the first rounded corner (1023) is 0.1 mm to 0.3 mm, so as to form a first noise reduction structure.

4. The vent structure for a mask of a breathing apparatus according to claim 2, wherein The first dense perforated area (101) is arranged in the bending area of ​​the bend (100), and the first exhaust hole (102) is arranged in an alternating manner in the bending area and symmetrically arranged in the bending area along the geometric center line. The wall thickness of the first dense perforated area (101) is 1.1 mm to 1.3 mm to form the first noise reduction structure.

5. The vent structure for a mask of a breathing apparatus according to claim 4, wherein The distance between two adjacent first exhaust holes (102) is 1.4 mm to 1.6 mm.

6. The vent structure for a ventilator mask of any one of claims 1 to 5, wherein, The second exhaust port (202) of the second densely perforated area (201) of the cover (200) adopts a second contraction type hole; The second constriction orifice includes a second cylindrical section (2021) at the outlet end and a second conical section (2022) at the inlet end. The large end of the second conical section (2022) is arranged towards the inner cavity of the bend (100), and the small end of the second conical section (2022) is connected to the first cylindrical section (1021) to form a second noise reduction structure.

7. The vent structure for a ventilator mask of claim 6, wherein, The radial dimension of the second cylindrical segment (2021) is 0.6 mm-0.7 mm, and the axial dimension of the second cylindrical segment (2021) is 0.1 mm-0.3 mm; and / or The large end intake position of the second conical section (2022) is set with a second rounded corner (2023), the radius of which is 0.4 mm-0.6 mm, to form a second noise reduction structure; and / or The distance between two adjacent second exhaust holes (202) is 1.6 mm to 1.8 mm.

8. The vent structure for a ventilator mask of claim 6, wherein, The second dense perforated area (201) is arranged in the upper edge area of ​​the cover (200), and the second exhaust holes (202) are arranged in an alternating manner in the upper edge area and are arranged symmetrically along the geometric center line in the upper edge area. The wall thickness of the second densely porous region (201) is 1.7 mm to 1.9 mm to form the second noise reduction structure.

9. The vent structure for a ventilator mask of claim 1, wherein, The mask (200) is a nose mask or a mouth and nose mask.

10. A ventilator mask, characterized in that, The ventilation port structure of the ventilator mask according to any one of claims 1 to 9.

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