Air intake components and oxygen concentrators for ventilation therapy equipment

Abstract

The present invention relates to the field of ventilation therapy equipment, and discloses an air intake assembly and an oxygen concentrator for ventilation therapy equipment, wherein the air intake assembly has an air intake channel and an ambient air inlet (11) and a purified air outlet respectively connected to both ends of the air intake channel, and a push-flow sound-suppression baffle (31) is provided in at least a portion of the section of the air intake channel to separate a main air intake channel (L1) and a branch air intake channel (L2) in the section, and the push-flow sound-suppression baffle (31) is arranged so that the branch airflow flowing through the branch air intake channel (L2) and the sound waves transmitted back through the branch air intake channel (L2) are both directed toward the direction close to the purified air outlet when they merge into the main air intake channel (L1). The air intake assembly can promote air intake efficiency while preventing the working noise generated by the compressor from being transmitted back to the external environment through the air intake channel, thereby improving the quietness and user experience of the ventilation therapy equipment.

Description

Technical Field

[0001] The present invention relates to a ventilation therapy device, and in particular to an air intake assembly for the ventilation therapy device. On this basis, the present invention also relates to an oxygen concentrator including the air intake assembly. Background Art

[0002] With the improvement of people's living standards and the advancement of medical technology, people are paying more and more attention to their health. Especially for those who suffer from chronic respiratory diseases, such as chronic obstructive pulmonary disease (COPD) and asthma, obtaining a continuous oxygen supply is particularly important. As a novel medical device, portable oxygen concentrators provide convenience for oxygen therapy and health care in people's daily lives. The core of portable oxygen concentrators lies in the use of the pressure swing adsorption (PSA) principle. It uses ambient air as raw material and, under normal temperature and low pressure conditions, utilizes the characteristics of molecular sieves that the adsorption capacity of nitrogen (adsorbate) in the air increases when pressurized and decreases when depressurized, forming a rapid cycle of pressurized adsorption and decompression desorption, so that oxygen and nitrogen in the air can be separated.

[0003] Portable oxygen concentrators offer numerous advantages. First, they are small, lightweight, and easy to carry, enabling patients to access oxygen anytime, anywhere, at home, during short outings, and on long trips. Second, portable oxygen concentrators are easy to use, providing a steady flow of oxygen with simple operation, making them suitable for the elderly and patients with limited mobility. Furthermore, portable oxygen concentrators are typically equipped with rechargeable batteries, offering long battery life and significantly increasing their flexibility. Therefore, portable oxygen concentrators are particularly suitable for patients requiring long-term oxygen therapy. In addition to price and oxygen supply performance, comfort, durability, and quietness are generally considered the three key factors that users prioritize.

[0004] Among them, for patients who need to use the portable oxygen concentrator for long periods of time or in a quiet environment, the noise level of the portable oxygen concentrator is one of the technical indicators that is of particular concern. Noise may not only affect the user's sleep quality and comfort, but may also place an additional burden on patients with cardiovascular and cerebrovascular diseases. For this reason, portable compressors usually use compressors with lower noise levels, and the compressor is separated from other components by buffering and vibration reduction elements in order to achieve the required quiet environment. However, this is still not enough to fully limit the transmission of compressor noise to the external environment, and the noise generated by the compressor is still an important factor affecting the user experience.

[0005] Furthermore, during operation, the compressor draws in ambient air from the outside environment, pressurizes it, and supplies it to the molecular sieve adsorption unit. To ensure the lifespan of the oxygen concentrator, ambient air is typically filtered and purified by an air intake filter before entering the compressor. This prevents impurities such as particles in the ambient air from accelerating wear on the compressor's leather cups and cylinder liners. This could lead to abnormal oxygen concentrations or pressures after a period of use, shortening the concentrator's lifespan. Summary of the Invention

[0006] The purpose of the present invention is to overcome the problem of poor quietness in ventilation therapy equipment such as portable oxygen concentrators in the prior art, and to provide an air intake component for ventilation therapy equipment. The air intake component is integrated with a resistant silencer function, which can not only promote the air intake efficiency, but also prevent the noise generated by the compressor from being transmitted to the external environment, thereby effectively improving the quietness of the ventilation therapy equipment and user experience.

[0007] In order to achieve the above-mentioned objectives, the present invention provides, on the one hand, an air intake assembly for a ventilation therapy device, which has an air intake channel provided with an air intake filter element and an ambient air inlet and a purified air outlet respectively connected to the two ends of the air intake channel, so that air can be inhaled from the external environment through the ambient air inlet and the filtered air can be output to the air intake power unit of the ventilation therapy device through the purified air outlet. A push-flow sound suppression baffle is provided in at least part of the section of the air intake channel to separate the main air intake flow channel and the branch air intake flow channel in the section, and the push-flow sound suppression baffle is configured so that the branch airflow flowing through the branch air intake flow channel and the sound waves transmitted back through the branch air intake flow channel are both oriented in a direction close to the purified air outlet when they merge into the main air intake flow channel.

[0008] Preferably, the air intake assembly includes a mounting base and a cover plate mounted to the mounting base, the air intake filter element is fixed between the cover plate and the mounting base, the air intake channel includes an air intake chamber and an exhaust chamber formed on the mounting base and separated by a partition, and an intermediate chamber defined by the air intake filter element and the cover plate, the air intake chamber and the exhaust chamber are respectively connected to the intermediate chamber through the air intake filter element.

[0009] Preferably, the ambient air inlet and the purified air outlet are provided on the mounting base, and the mounting base is integrally formed on the main frame of the ventilation therapy device.

[0010] Preferably, the mounting base is formed or mounted with an air intake pipe connecting the ambient air inlet to the air intake chamber, so as to form a sudden change in the channel cross section at one end connected to the air intake chamber.

[0011] Preferably, the air intake filter element includes a soft rubber frame clamped between the cover plate and the mounting base and an air intake filter cotton connected to the soft rubber frame, the frame portion of the soft rubber frame is formed with an annular groove, and the cover plate is formed with an annular protrusion embedded in the annular groove.

[0012] Further preferably, the soft rubber frame has a middle sealing strip, and the cover plate is formed with a supporting boss. In the assembled state, the supporting boss squeezes one side of the middle sealing strip and makes the other side of the middle sealing strip in sealing contact with the partition.

[0013] Preferably, the mounting base is formed with a card slot and a threaded hole, and the two ends of the cover plate respectively have an insert plate inserted into the card slot and a through hole aligned with the threaded hole, so that it can be detachably mounted to the mounting base by a threaded fastener passing through the through hole and threadedly connected to the threaded hole.

[0014] Preferably, the push-flow sound-suppression baffle is formed on a side of the cover plate facing the air intake filter element, so that the main intake air flow channel and the branch intake air flow channel are formed in the intermediate chamber.

[0015] Further preferably, a plurality of the push-flow sound-suppression baffles are symmetrically distributed on both sides of the center line of the cover plate, and the main intake air duct extends along the center line. In the direction toward the main intake air duct, the push-flow sound-suppression baffles are formed into strips that extend obliquely toward the direction close to the purified air outlet.

[0016] Further preferably, the cover plate is provided with an annular frame on the side facing the air intake filter element, which surrounds the push-flow sound suppression baffle and is flush with the push-flow sound suppression baffle. The multiple push-flow sound suppression baffles include alternatingly distributed separation push-flow sound suppression baffles and through-flow push-flow sound suppression baffles. The separation push-flow sound suppression baffles extend from the annular frame toward the center line. The through-flow push-flow sound suppression baffles are separated from the adjacent separation push-flow sound suppression baffles and the annular frame to form the branch intake air flow channel in the gap therebetween.

[0017] More preferably, the separating plug-flow sound suppression baffle and the through-flow plug-flow sound suppression baffle are parallel to each other, and the through-flow plug-flow sound suppression baffle has two end faces parallel to the center line and two side faces facing the adjacent separating plug-flow sound suppression baffle, and there is an arc-shaped transition angle between the end face and the side face.

[0018] A second aspect of the present invention provides an oxygen concentrator, comprising a compressor and the above-mentioned air intake assembly, wherein the purified air outlet of the air intake assembly is connected to the air intake of the compressor.

[0019] Through the above technical solution, the air intake assembly of the present invention integrates the air intake filtering and purification function and the resistance silencing function, which not only facilitates better space utilization in ventilation therapy equipment such as portable oxygen concentrators, but also can use the air intake filter element to filter the ambient air inhaled into the compressor, and use the main intake air duct and branch intake air duct separated by the push flow sound suppression baffle to promote the air intake efficiency while preventing the working noise generated by the compressor from being transmitted back to the external environment through the air intake duct, thereby improving the quietness and user experience of the ventilation therapy equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a three-dimensional diagram of the internal structure of an oxygen concentrator according to a preferred embodiment of the present invention;

[0021] Figure 2 Observed from another perspective Figure 1 A three-dimensional view of the internal structure of the oxygen concentrator, with the air intake assembly exploded for display;

[0022] Figure 3 yes Figure 1 A cross-sectional view of the internal structure of the oxygen concentrator;

[0023] Figure 4 yes Figure 3 An enlarged view of a portion A in FIG. 1 , showing an air intake assembly provided by the present invention;

[0024] Figure 5 yes Figure 4 A front view of the mounting base of the air intake assembly shown in FIG;

[0025] Figure 6 yes Figure 4 A top view of the mounting base of the air intake assembly shown in FIG;

[0026] Figure 7 yes Figure 4 A perspective view of an air intake filter element of an air intake assembly shown in FIG;

[0027] Figure 8 yes Figure 4 A perspective view of the cover plate of the air intake assembly shown in FIG;

[0028] Figure 9 yes Figure 8 inner side view of the middle cover;

[0029] Figure 10 yes Figure 9 Enlarged view of the middle part B;

[0030] Figure 11 Arrows indicate the direction of airflow in the main intake duct and the branch intake duct when the airflow passes through the inner side of the cover plate;

[0031] Figure 12 Arrows indicate the propagation direction of the working noise transmitted back from the purified air outlet through the main intake air duct and the branch intake air duct when the noise propagates through the inner side of the cover plate.

[0032] Description of Reference Numerals

[0033] 1-Mounting base; 11-Ambient air inlet; 12-Partition; 13-Intake chamber; 14-Exhaust chamber; 15-Intake pipe; 16-Sudden channel section; 17-Card slot; 18-Threaded hole; 2-Intake filter element; 21-Soft rubber frame; 211-Annular groove; 212-Middle sealing strip; 22-Intake filter cotton; 3-Cover plate; 31-Push flow sound suppression baffle; 311-Separation push flow sound suppression baffle; 312-Through flow push flow sound suppression baffle; 32-Middle chamber; 33-Annular protrusion; 34-Support boss; 35-Insert plate; 36-Through hole; 37-Annular frame; 4-Threaded fasteners; L1-Main intake air duct; L2-Branch intake air duct; 100-Main frame; 200-Compressor. DETAILED DESCRIPTION

[0034] The following describes the specific embodiments of the present invention in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0035] Reference Figures 1 to 3 As shown, one aspect of the present invention provides an oxygen concentrator. To facilitate clear representation of the key components of the oxygen concentrator, only the internal structure of the oxygen concentrator is shown in the figure. Typically, the oxygen concentrator includes a main frame 100 and a compressor 200 installed within the main frame 100, a molecular sieve adsorption tower (not shown), and a ventilation control module. During operation, the compressor 200 draws ambient air from the external environment, pressurizes the ambient air, and supplies it to the adsorption tower. The adsorption tower then separates the oxygen and nitrogen in the ambient air to produce the oxygen required for oxygen therapy. As mentioned above, in order to prevent impurities such as particles in the ambient air from accelerating the wear of the leather cup and cylinder liner in the compressor, the ambient air to be supplied to the compressor 200 is usually filtered to remove impurity particles and ensure the service life of the oxygen concentrator. At the same time, the operating noise generated by the compressor 200 during operation will be transmitted back to the external environment through the air intake channel, which will affect the user experience, especially for patients who need to use it for a long time or in a quiet environment.

[0036] To this end, another aspect of the present invention provides an air intake assembly that can be used in the above-mentioned oxygen concentrator. The air intake assembly can effectively prevent the noise generated by the compressor from being transmitted to the external environment, thereby effectively improving the quietness of the oxygen concentrator and the user experience. It should be understood that although the air intake assembly provided by the present invention will be mainly described here and below using the oxygen concentrator as an example, the air intake assembly can also be used in other types of ventilation therapy equipment (such as a ventilator), and the filtered ambient air can also be supplied to other air intake power units such as a blower.

[0037] Reference Figures 4 to 10 As shown, according to a preferred embodiment of the present invention, an air intake assembly has an air intake channel provided with an air intake filter element 2, and an ambient air inlet 11 and a purified air outlet respectively connected to the two ends of the air intake channel, so that air can be drawn in from the external environment through the ambient air inlet 11 and filtered air can be output to the air intake power unit of the ventilation therapy device (such as the compressor of the oxygen concentrator) through the purified air outlet. In which, a push flow and sound suppression baffle 31 is provided in at least a portion of the air intake channel to separate the main air intake channel L1 and the branch air intake channel L2 in the section, as shown in FIG. Figure 11 and Figure 12 As shown, the push-flow sound suppression baffle 31 is configured so that the branch airflow flowing through the branch intake air duct L2 and the sound waves transmitted back through the branch intake air duct L2 are both directed towards the direction close to the purified air outlet when merging into the main intake air duct L1.

[0038] Specifically, if Figure 11 As shown, a plurality of push-flow sound-suppression baffles 31 are symmetrically arranged on the inner side of the cover plate 3 (which will be described in detail later). As a result, from top to bottom in the figure, the gas mainly flows through the main inlet flow channel L1 between the mutually symmetrical push-flow sound-suppression baffles 31, while part of the gas flows laterally under the guidance of the push-flow sound-suppression baffles 31, passing through the gaps between the push-flow sound-suppression baffles 31 on the same side (that is, the gaps between the push-flow sound-suppression baffles 31 on the same side) and then flows into the main inlet flow channel L1. Figure 10 The gap between the adjacent through-flow push-flow sound-suppressing baffle 312 and the separated push-flow sound-suppressing baffle 311) and the gap between the push-flow sound-suppressing baffle 31 and the edge of the part of the space (that is, the gap between the adjacent through-flow push-flow sound-suppressing baffle 312 and the separated push-flow sound-suppressing baffle 311) and the gap between the push-flow sound-s Figure 10The air in the branch air inlet duct L2 is connected to the main air inlet duct L1 and the connecting passage outside the main air inlet duct L1 forms a branch air inlet duct L2. When the airflow of the branch air inlet duct L2 merges into the main air inlet duct L1, the angle between the direction of the branch airflow and the direction of the main airflow is an acute angle, both of which are directed towards the direction close to the purified air outlet. The airflow thus converged can accelerate the air intake speed and improve the air intake efficiency. In addition, when part of the airflow flows through the gap between the push-flow sound suppression baffles 31 on the same side and the gap between the push-flow sound suppression baffle 31 and the edge of the part of the space, the airflow pressure is relatively large relative to that in the main air inlet duct L1. Therefore, when this part of the airflow merges into the main air inlet duct L1, the flow rate of the airflow is accelerated, thereby playing a role in promoting the flow of gas.

[0039] On the contrary, Figure 12 As shown, when the operating noise generated by compressor 200 passes through the purified air outlet and enters the air intake passage, a portion of the sound waves is transmitted upward from the bottom of the main air intake passage L1, while another portion of the sound waves is transmitted through the branch air intake passage L2. When the sound waves transmitted through the branch air intake passage L2 merge into the main air intake passage L1, the angle between their propagation direction and the direction of the sound waves transmitted back through the main air intake passage L1 is an obtuse angle, that is, the propagation direction of the sound waves in the branch air intake passage L2 is opposite to that of the sound waves in the main air intake passage L1. However, since the sound waves of the two have the same frequency, they will cancel out at least part of the sound waves, achieving a noise reduction effect.

[0040] Therefore, the above-mentioned air intake assembly of the present invention integrates the air intake filtering and purification function and the resistance silencing function, which is not only convenient for better improving the space utilization in ventilation therapy equipment such as portable oxygen concentrators, but also can use the air intake filter element to filter the ambient air sucked into the compressor, and use the main intake air duct L1 and the branch intake air duct L2 separated by the push flow sound suppression baffle 31 to promote the air intake efficiency of the air flow flowing into the compressor while preventing the working noise generated by the compressor 200 from being transmitted back to the external environment through the air intake channel, thereby improving the quietness and user experience of the ventilation therapy equipment.

[0041] Further, refer to Figures 1 to 4As shown, the air intake assembly of the present invention may include a mounting base 1 and a cover plate 3 mounted to the mounting base 1, and the air intake filter element 2 is fixed between the cover plate 3 and the mounting base 1. The air intake channel includes an air intake chamber 13 and an exhaust chamber 14 formed on the mounting base 1 and separated by a partition 12, and an intermediate chamber 32 defined by the air intake filter element 2 and the cover plate 3. The air intake chamber 13 and the exhaust chamber 14 are respectively connected to the intermediate chamber 32 through the air intake filter element 2. Thus, after the ambient air is sucked into the air intake channel through the ambient air inlet 11, it will be transported to the purified air outlet through the air intake chamber 13, the intermediate chamber 32 and the exhaust chamber 14 in sequence, and then enter the compressor. In the preferred embodiment shown in the figure, the push flow sound suppression baffle 31 is arranged in the intermediate chamber 32, and more specifically is formed integrally on the side of the cover plate 3 facing the air intake filter element 2, as shown in FIG. Figure 9 In other embodiments, the push-flow sound-suppression baffle 31 may also be disposed in the air intake chamber 13 and / or the air exhaust chamber 14 .

[0042] The mounting base 1, serving as a mounting foundation, can be integrated onto the main frame 100 or housing of the oxygen concentrator, with the cover plate 3 and the air intake filter element 2 mounted to the mounting base 1. For example, in the illustrated preferred embodiment, the mounting base 1 is integrally formed on the main frame 100 and defines an air intake chamber 13 and an air exhaust chamber 14 separated by a partition 12. Furthermore, the ambient air inlet 11 connected to the air intake chamber 13 and the purified air outlet connected to the air exhaust chamber 14 are also disposed on the mounting base 1. In other embodiments, the air intake assembly of the present invention can be provided as a relatively independent component from the main frame 100 and installed in an assembled form within the oxygen concentrator.

[0043] Figure 5 and Figure 6 The front view and top view of the mounting base 1 in the air intake assembly of a preferred embodiment are shown respectively. Figures 1 to 3 The air inlet assembly of the present invention is shown in the orientation shown in the figure, and is used to introduce ambient air into the air inlet passage to meet the needs of oxygen production. It will be understood that although only a single ambient air inlet 11 is shown here, the air inlet assembly of the present invention can also be formed to have an ambient air inlet composed of multiple small channels or hole groups.

[0044] Furthermore, the mounting base 1 is formed or mounted with an intake pipe 15 extending toward the intake chamber 13. The length of the intake pipe 15 within the intake chamber 13 can be 1 / 4 to 1 / 2 of the length of the intake chamber 13 in the corresponding direction, effectively muffling noise of specific frequency components. The intake pipe 15 connects the ambient air inlet 11 to the intake chamber 13, thereby introducing ambient air into the intake chamber 13. The sudden change in the cross-sectional area of ​​the intake passage 16, formed at the end of the intake pipe 15 facing the intake chamber 13, can be utilized to cause the cross-sectional area of ​​the intake passage to suddenly change. This causes sound waves propagating within the intake passage to repeatedly reflect within the intake chamber 13, thereby preventing at least some noise from being transmitted to the external environment through collision. Furthermore, due to the use of this reactive muffler method, it does not significantly increase intake resistance, as would be the case with resistive muffler methods, thereby achieving a balance between smooth intake and quiet operation. The air intake pipe 15 may be integrally formed on the main frame 100 as part of the mounting base 1 , or it may be independently formed relative to the main frame 100 and mounted to the mounting base 1 to connect the ambient air inlet 11 to the air intake chamber 13 .

[0045] In the front view, the air intake chamber 13 is located above the partition 12, and the air exhaust chamber 14 is located below the partition 12. The air exhaust chamber 14 is provided with a purified air outlet, which can be connected to the air intake connector of the compressor 200. The mounting base 1 may also include related structures for connecting to the cover plate 3, such as threaded holes 18 and slots 17, which will be described in detail later in conjunction with the cover plate 3.

[0046] Figure 7 The figure shows an air intake filter element 2 in an air intake assembly according to a preferred embodiment of the present invention, which includes a soft rubber frame 21 clamped between a cover plate 3 and a mounting base 1, and an air intake filter 22 connected to the soft rubber frame 21. In other embodiments, at least, the air intake filter element 2 should include a filter element that separates the air intake chamber 13 from the intermediate chamber 32, and the air exhaust chamber 14 from the intermediate chamber 32. For example, the filter element can be directly connected to the peripheral frames of the air intake chamber 13 and the air exhaust chamber 14.

[0047] The illustrated soft rubber frame 21 of the air intake filter element 2 has structures corresponding to the periphery of the air intake chamber 13 and the exhaust chamber 14, as well as the partition 12. The soft rubber frame 21 not only serves as a connection and contact for the air intake filter cotton 22, but also acts as a seal between the cover plate 3 and the mounting base 1 to prevent air leakage. To this end, the frame portion of the soft rubber frame 21 can be formed with an annular groove 211, and the cover plate 3 is formed with an annular protrusion 33 that fits into the annular groove 211. This allows the air intake filter element 2 to be pre-installed on the cover plate 3 before assembling the cover plate 3 to the mounting base 1, thereby facilitating installation of the air intake assembly.

[0048] By forming an intake chamber 13 and an exhaust chamber 14 separated by a partition 12 in the mounting base 1, and separating the intake chamber 13 and the exhaust chamber 14 from the intermediate chamber 32 respectively by an intake filter cotton 22, the ambient air passes through the intake filter cotton 22 twice before being delivered to the compressor, thereby achieving a two-stage purification filtration, which can effectively remove particulate impurities in the ambient air, thereby further ensuring the cleanliness of the air supplied to the compressor 200, and improving the durability of the compressor and the service life of the entire machine. In addition, even if one of the filter stages is damaged or otherwise fails (such as a connection gap) due to the impact of airflow, the other filter stage can be used to ensure the filtering effect on the impurity particles in the ambient air, avoiding the risk of damage to the compressor due to failure to maintain it in time.

[0049] In order to prevent the air in the air intake chamber 13 from directly entering the exhaust chamber 14 without passing through the air intake filter cotton 22, the soft rubber frame 21 may also have an intermediate sealing strip 212. Figure 9 As shown, the cover plate 3 is formed with a supporting boss 34. In the assembled state, the supporting boss 34 squeezes one side of the middle sealing strip 212 and makes the other side of the middle sealing strip 212 in sealing contact with the partition 12, as shown in FIG. Figure 4 shown.

[0050] Figure 8 and Figure 9 The cover plate 3 in the air intake assembly of a preferred embodiment of the present invention is shown. The cover plate 3 has an insert plate 35 and a through hole 36 at both ends. When installing, first, the air intake filter element 2 is assembled on the inner side of the cover plate 3 so that the annular protrusion 33 on the cover plate 3 is inserted into the annular groove 211 of the soft rubber frame 21; then, the cover plate 3 can be installed so that its insert plate 35 is inserted into the card slot 17 formed on the mounting base 1, and then the cover plate 3 is pushed to be embedded in one side of the mounting base 1; finally, the threaded fastener 4 (see Figure 2 and Figure 4 ) passes through the through hole 36 on the cover plate 3 and is screwed to the threaded hole 18 of the mounting base 1 until the soft rubber frame 21 of the air intake filter element 2 is pressed (including the support boss 34 of the cover plate 3 pressing the middle sealing strip 212 of the soft rubber frame 21 onto the partition 12 of the mounting base 1), and the air intake filter cotton 22 separates the air intake chamber 13 and the exhaust chamber 14 from the middle chamber 32. Through the above-mentioned connection method, not only is it convenient to realize the assembly and disassembly of the various components in the air intake assembly, but it is also possible to apply and maintain a high pressing force on the air intake filter element 2 to ensure that the ambient air is filtered by the air intake filter element 2 and then sucked into the compressor. In an alternative embodiment, the cover plate 3 and the mounting base 1 can have multiple sets of snap connection structures, which can also realize the detachable installation of the cover plate 3.

[0051] When the air intake filter element 2 is assembled on the inner side of the cover plate 3, an intermediate chamber 32 is defined between the cover plate 3 and the air intake filter element 2. A push-flow sound-suppressing baffle 31 can be formed on the side of the cover plate 3 facing the air intake filter element 2, so that the main intake flow channel L1 and the branch intake flow channel L2 are formed in the intermediate chamber 32.

[0052] In the preferred embodiment shown in the figure, the cover plate 3 is formed as a symmetrical element, and multiple push-flow sound-suppression baffles 31 are symmetrically distributed on both sides of the center line of the cover plate 3. As a result, the main inlet airflow channel L1 extends along the center line; in the direction toward the main inlet airflow channel L1, the push-flow sound-suppression baffles 31 are formed into strips extending obliquely downward, and are symmetrically arranged in an inverted figure eight shape on both sides of the center line, thereby achieving the effect of push-flow sound suppression. Specifically, as Figure 11 As shown, when the airflow of the branch intake duct L2 merges into the main intake duct L1, the angle between the branch airflow direction and the main airflow direction is an acute angle, both of which are directed towards the direction close to the purified air outlet, thereby accelerating the intake speed and improving the intake efficiency; Figure 12 As shown, when the sound waves propagating through the branch intake air duct L2 merge into the main intake air duct L1, the angle between its propagation direction and the direction of the sound waves transmitted back through the main intake air duct L1 is an obtuse angle, that is, the sound wave propagation direction of the branch intake air duct L2 is opposite to the sound wave propagation direction of the main intake air duct L1. Since the sound wave frequencies of the two are the same, they will cancel out at least part of the sound waves to achieve a silencing effect.

[0053] Combine Figures 9 to 12 As shown, an annular frame 37 is formed on the side of the cover plate 3 facing the air inlet filter element 2. The annular frame 37 can be, for example, generally rectangular and surrounds the flow-pushing sound-suppressing baffle 31. The height of the protrusion toward the air inlet filter element 2 is flush with the flow-pushing sound-suppressing baffle 31. The plurality of flow-pushing sound-suppressing baffles 31 include alternatingly distributed separation flow-pushing sound-suppressing baffles 311 and through-flow flow-pushing sound-suppressing baffles 312. The separation flow-pushing sound-suppressing baffles 311 extend from the annular frame 37 toward the center line of the cover plate 3. The through-flow flow-pushing sound-suppressing baffles 312 are separated from the adjacent separation flow-pushing sound-suppressing baffles 311 and the annular frame 37 to form a branched intake air flow channel L2 in the gap therebetween. Thus, as shown in FIG. Figure 11 As shown, the gas mainly flows through the main inlet flow channel L1 between the mutually symmetrical push-flow sound suppression baffles 31, while part of the gas flows horizontally under the guidance of the push-flow sound suppression baffles 31, and flows in sequence through the gaps between the adjacent through-flow push-flow sound suppression baffles 312 and the separating push-flow sound suppression baffles 311, and the gaps between the separating push-flow sound suppression baffles 311 and the annular frame 37. These gaps form branch inlet flow channels L2. When the airflow of the branch inlet flow channel L2 merges into the main inlet flow channel L1, the angle between the direction of the branch airflow and the direction of the main airflow is an acute angle, both of which are oriented in the direction close to the purified air outlet. The airflow that can be converged can accelerate the air intake speed and improve the air intake efficiency.

[0054] On the contrary, Figure 12 As shown, when the operating noise generated by compressor 200 passes through the purified air outlet and enters the air intake passage, a portion of the sound waves is transmitted upward from the bottom of the main air intake passage L1, while another portion of the sound waves is transmitted through the branch air intake passage L2. When the sound waves transmitted through the branch air intake passage L2 merge into the main air intake passage L1, the angle between their propagation direction and the direction of the sound waves transmitted back through the main air intake passage L1 is an obtuse angle, that is, the propagation direction of the sound waves in the branch air intake passage L2 is opposite to that of the sound waves in the main air intake passage L1. However, since the sound waves of the two have the same frequency, they will cancel out at least part of the sound waves, achieving a noise reduction effect.

[0055] In addition, in order to facilitate the smooth flow of air in the main intake air duct L1 and the branch intake air duct L2, it is necessary to reasonably set the shape and arrangement of the push-flow sound suppression baffle 31. For example, the separation push-flow sound suppression baffle 311 can be set to be parallel to the through-flow push-flow sound suppression baffle 312. In the preferred embodiment shown in the figure, the through-flow push-flow sound suppression baffle 312 has two end faces 312a that are respectively parallel to the center line of the cover plate 3 and two side faces 312b that are respectively facing the adjacent separation push-flow sound suppression baffle 311, and there is an angle between the end face 312a and the side face 312b that is an arc-shaped transition. As a result, when the airflow flows in the branch intake air duct L2, and when the branch airflow merges from the branch intake air duct L2 into the main intake air duct L1, it can flow smoothly, ensuring a high intake efficiency.

[0056] The air intake assembly of the present invention integrates an air intake filtration and purification function and a resistance silencing function, which not only facilitates better space utilization within the limited space of the portable oxygen concentrator, but also ensures smooth air intake. The main and branch air intake ducts separated by the push-flow sound suppression baffle and the sudden change in the channel interface when the plug-in internal pipe is introduced into the air intake chamber prevent the compressor piston working noise from being transmitted back along the air path, thereby improving the quietness of the oxygen concentrator during operation and providing a better user experience. In addition, the air intake assembly can be configured to have a dual-stage filtration function, so that the ambient air is filtered twice before entering the compressor, greatly reducing the probability of impurity particles penetrating the filter, thereby reducing the probability of abnormal wear of the compressor and extending the service life of the compressor and the entire machine.

[0057] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Within the scope of the technical concept of the present invention, the technical solution of the present invention may be subjected to a variety of simple modifications, including combining the various specific technical features in any suitable manner. To avoid unnecessary repetition, the present invention will not further describe various possible combinations. However, these simple modifications and combinations should also be regarded as disclosed in the present invention and fall within the scope of protection of the present invention.

Claims

1. An air intake assembly for a ventilation therapy device, the air intake assembly comprising an air intake passage provided with an air intake filter element (2), and an ambient air inlet (11) and a purified air outlet respectively connected to both ends of the air intake passage, so as to be able to inhale air from the external environment through the ambient air inlet (11) and output filtered air to an air intake power unit of the ventilation therapy device through the purified air outlet, characterized in that: A push-flow sound-suppression baffle (31) is provided in at least a portion of the section of the air intake channel to separate the section into a main air intake channel (L1) and a branch air intake channel (L2), and the push-flow sound-suppression baffle (31) is configured so that the branch airflow flowing through the branch air intake channel (L2) and the sound waves transmitted back through the branch air intake channel (L2) are both directed towards a direction close to the purified air outlet when merging into the main air intake channel (L1).

2. The air inlet assembly for ventilation therapy equipment according to claim 1, characterized in that: The air intake assembly comprises a mounting base (1) and a cover plate (3) mounted on the mounting base (1); the air intake filter element (2) is fixed between the cover plate (3) and the mounting base (1); the air intake passage comprises an air intake chamber (13) and an exhaust chamber (14) formed on the mounting base (1) and separated by a partition plate (12); and an intermediate chamber (32) defined by the air intake filter element (2) and the cover plate (3); the air intake chamber (13) and the exhaust chamber (14) are respectively connected to the intermediate chamber (32) through the air intake filter element (2).

3. The air inlet assembly for ventilation therapy equipment according to claim 2, characterized in that: The ambient air inlet (11) and the purified air outlet are provided on the mounting base (1), and the mounting base (1) is integrally formed on the main frame (100) of the ventilation therapy device.

4. The air inlet assembly for ventilation therapy equipment according to claim 2, characterized in that: The mounting base (1) is formed or installed with an air intake pipe (15) connecting the ambient air inlet (11) to the air intake chamber (13), so as to form a sudden change in the channel cross section (16) at one end connected to the air intake chamber (13).

5. The air inlet assembly for ventilation therapy equipment according to claim 2, characterized in that: The air intake filter element (2) comprises a soft rubber frame (21) clamped between the cover plate (3) and the mounting base (1) and an air intake filter cotton (22) connected to the soft rubber frame (21); a frame portion of the soft rubber frame (21) is formed with an annular groove (211); and the cover plate (3) is formed with an annular protrusion (33) embedded in the annular groove (211).

6. The air inlet assembly for ventilation therapy equipment according to claim 5, characterized in that: The soft rubber frame (21) has a middle sealing strip (212), and the cover plate (3) is formed with a supporting boss (34). In an assembled state, the supporting boss (34) presses one side of the middle sealing strip (212) and enables the other side of the middle sealing strip (212) to be in sealing contact with the partition (12).

7. The air inlet assembly for ventilation therapy equipment according to claim 2, characterized in that: The mounting base (1) is formed with a card slot (17) and a threaded hole (18), and the two ends of the cover plate (3) are respectively provided with an insert plate (35) inserted into the card slot (17) and a through hole (36) aligned with the threaded hole (18), so that the cover plate (3) can be detachably mounted on the mounting base (1) by a threaded fastener (4) passing through the through hole (36) and threadedly connected to the threaded hole (18).

8. The air inlet assembly for ventilation therapy equipment according to claim 2, characterized in that: The push-flow sound-suppression baffle (31) is formed on the side of the cover plate (3) facing the air intake filter element (2), so that the main intake flow channel (L1) and the branch intake flow channel (L2) are formed in the intermediate chamber (32).

9. The air inlet assembly for ventilation therapy equipment according to claim 8, characterized in that: A plurality of the push-flow sound-suppression baffles (31) are symmetrically distributed on both sides of the center line of the cover plate (3), and the main inlet airflow channel (L1) extends along the center line. In the direction toward the main inlet airflow channel (L1), the push-flow sound-suppression baffles (31) are formed into strips that extend obliquely toward the direction close to the purified air outlet.

10. The air inlet assembly for ventilation therapy equipment according to claim 9, characterized in that: The cover plate (3) is further provided with an annular frame (37) on the side facing the air intake filter element (2), which surrounds the push-flow sound suppression baffle (31) and is flush with the push-flow sound suppression baffle (31). The plurality of push-flow sound suppression baffles (31) include alternately distributed separation push-flow sound suppression baffles (311) and through-flow push-flow sound suppression baffles (312). The separation push-flow sound suppression baffles (311) extend from the annular frame (37) toward the center line. The through-flow push-flow sound suppression baffles (312) are separated from the adjacent separation push-flow sound suppression baffles (311) and the annular frame (37) to form the branch intake air flow channel (L2) in the gap therebetween.

11. The air inlet assembly for ventilation therapy equipment according to claim 10, characterized in that: The separating plug-flow sound suppression baffle (311) and the through-flow plug-flow sound suppression baffle (312) are parallel to each other, and the through-flow plug-flow sound suppression baffle (312) has two end faces (312a) respectively parallel to the center line and two side faces (312b) respectively facing the adjacent separating plug-flow sound suppression baffle (311), and an angle with an arc-shaped transition is formed between the end faces (312a) and the side faces (312b).

12. An oxygen concentrator, characterized in that: The oxygen concentrator comprises a compressor (200) and an air intake assembly according to any one of claims 1 to 11, wherein the purified air outlet of the air intake assembly is connected to the air intake of the compressor (200).

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