Air inlet assembly for ventilation treatment equipment and oxygen generator

Abstract

The invention relates to the field of ventilation treatment equipment, and discloses an air inlet assembly for ventilation treatment equipment and an oxygenerator, the air inlet assembly is provided with an air inlet channel, an ambient air inlet (11) and a purified air outlet, the ambient air inlet (11) and the purified air outlet are communicated with the two ends of the air inlet channel respectively, and a plug flow sound suppression baffle (31) is arranged in at least part of the section of the air inlet channel. The flow pushing and sound suppressing baffle (31) is arranged in the section so as to divide the section into a main air inlet flow channel (L1) and a branch air inlet flow channel (L2), and the flow pushing and sound suppressing baffle (31) is arranged to enable branch air flow flowing through the branch air inlet flow channel (L2) and sound waves passing back through the branch air inlet flow channel (L2) to face the direction close to the purified air outlet when converging into the main air inlet flow channel (L1). The air inlet assembly can prevent working noise generated by the compressor from being transmitted back to the external environment through the air inlet channel while promoting air inlet efficiency, and therefore quietness and user experience of the ventilation treatment equipment are improved.

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 human living standards and the advancement of medical technology, people pay more and more attention to health. Especially for those who suffer from chronic respiratory diseases, such as chronic obstructive pulmonary disease (COPD) and asthma, it is particularly important to obtain a continuous supply of oxygen. 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 is to adopt the principle of pressure swing adsorption (PSA), using ambient air as raw material, under normal temperature and low pressure conditions, using the characteristics of molecular sieves that the adsorption capacity of nitrogen (adsorbate) in the air increases when pressurized and decreases when decompressed, forming a rapid cycle process of pressurized adsorption and decompression desorption, so that oxygen and nitrogen in the air can be separated.

[0003] Portable oxygen concentrators have many advantages. First, they are small in size, light in weight, and easy to carry, allowing patients to get oxygen supply anytime and anywhere at home, during short outings, and during long-distance travel. Secondly, portable oxygen concentrators are easy to use and can provide a stable flow of oxygen through simple operations, making them suitable for the elderly and patients with limited mobility. In addition, portable oxygen concentrators are usually equipped with rechargeable batteries, which provide long battery life and greatly increase the flexibility of use. Therefore, portable oxygen concentrators are particularly suitable for patients who require long-term oxygen therapy. In addition to price and oxygen supply performance indicators, comfort, durability, and quietness are usually considered to be the three key indicators that users pay most attention to.

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

[0005] In addition, during operation, the compressor inhales ambient air from the outside environment and supplies it to the molecular sieve adsorption unit after pressurization. In order to ensure the service life of the oxygen concentrator, the ambient air is usually filtered and purified by the air intake filter element before being supplied to the compressor to prevent impurities such as particles in the ambient air from accelerating the wear of the leather cup and cylinder liner in the compressor, resulting in abnormal oxygen concentration or pressure after the oxygen concentrator has been used for a period of time, affecting the service life of the oxygen concentrator. 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 assembly for ventilation therapy equipment. The air intake assembly 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 propagating 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, on the one hand, the present invention provides an air intake assembly for a ventilation therapy device, the air intake assembly having 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 a main intake airflow channel and a branch intake airflow channel in the section, and the push-flow sound suppression baffle is arranged so that the branch airflow flowing through the branch intake airflow channel and the sound waves transmitted back through the branch intake airflow channel are both oriented in a direction close to the purified air outlet when they merge into the main intake airflow 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, and 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 arranged 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, which, in the assembled state, 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 insertion 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 passage and the branch intake air passage are formed in the intermediate chamber.

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

[0016] Further preferably, an annular frame is formed on the side of the cover plate 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 alternately 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, and 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 port of the compressor.

[0019] Through the above technical scheme, the 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 a portable oxygen concentrator, but also can use the air intake filter element to filter the ambient air sucked into the compressor, and use the main intake air flow duct and branch intake air flow 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 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 part A in the figure, showing the air intake assembly provided by the present invention;

[0024] Figure 5 yes Figure 4 A front view of a mounting base for an air intake assembly shown in;

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

[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 a cover plate of an air intake assembly shown in FIG.

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

[0029] Fig.10 yes Fig. 9 A magnified view of the part B in the middle;

[0030] Fig.11 Arrows are used to indicate the airflow direction in the main intake air passage and the branch intake air passage when the airflow flows through the inner side of the cover plate;

[0031] Fig.12 Arrows are used to indicate the propagation direction of the working noise transmitted back from the purified air outlet through the inner side of the cover plate in the main intake air duct and the branch intake air duct.

[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-mutated channel section; 17-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-pushing flow sound suppression baffle; 311-separating pushing flow sound suppression baffle; 312-through-flow pushing flow sound suppression baffle; 32-middle chamber; 33-annular protrusion; 34-supporting boss; 35-insertion 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 specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0035] Reference Figures 1 to 3 As shown, one aspect of the present invention provides an oxygen concentrator. In order to clearly indicate 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 in the main frame 100, a molecular sieve adsorption tower (not shown), and a ventilation control module, etc. During operation, the compressor 200 inhales ambient air from the external environment, and supplies the ambient air to the adsorption tower after pressurization, and then the adsorption tower 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, it is usually necessary to filter the ambient air to be supplied to the compressor 200 to remove the impurity particles and ensure the service life of the oxygen concentrator. At the same time, the working noise generated during the operation of the compressor 200 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 need to use it 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, which can effectively prevent the noise generated by the compressor from propagating to the external environment, thereby effectively improving the quietness and user experience of the oxygen concentrator. 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 ambient air filtered by it 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 inhaled from the external environment through the ambient air inlet 11, and filtered air can be output to the air intake power unit (such as the compressor of the oxygen concentrator) of the ventilation therapy device through the purified air outlet. Among them, a push flow sound suppression baffle 31 is provided in at least a part of the section 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. Fig.11 and Fig.12 As shown, the push-flow sound-suppression baffle 31 is arranged so that the branch airflow flowing through the branch intake air passage L2 and the sound waves transmitted back through the branch intake air passage L2 are both oriented toward a direction close to the purified air outlet when they merge into the main intake air passage L1.

[0038] Specifically, Fig.11 As shown, a plurality of plug-flow sound-suppression baffles 31 are symmetrically arranged on the inner side of the cover plate 3 (to be described in detail later), so that, from top to bottom in the figure, the gas mainly flows through the main inlet flow channel L1 between the symmetrical plug-flow sound-suppression baffles 31, while part of the gas flows laterally under the guidance of the plug-flow sound-suppression baffles 31, passing through the gaps between the plug-flow sound-suppression baffles 31 on the same side (that is, the gas will be combined with the plug-flow sound-suppression baffles 31 later). Fig.10 The gap between the adjacent through-flow plug-flow sound-suppressing baffle 312 and the separated plug-flow sound-suppressing baffle 311) and the gap between the plug-flow sound-suppressing baffle 31 and the edge of the part of the space (that is, the gap between the plug-flow sound-suppressing baffle 31 and the edge of the part of the space) are described in detail. Fig.10The air in the branch inlet air duct L2 flows through the gap between the detailed separating plug-flow sound suppression baffle 311 and the annular frame 37, where the connecting passage outside the main inlet air duct L1 forms a branch inlet air duct L2. When the airflow of the branch inlet air duct L2 merges into the main inlet air 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 toward the direction close to the purified air outlet, so that the converged airflow can speed up the air intake speed and improve the air intake efficiency. In addition, when part of the airflow flows through the gap between the plug-flow sound suppression baffle 31 on the same side and the gap between the plug-flow sound suppression baffle 31 and the edge of the part of the space, the airflow pressure is relatively large relative to the main inlet air duct L1. Therefore, when this part of the airflow merges into the main inlet air duct L1, the flow rate of the airflow is accelerated, thereby playing a role in promoting the flow of gas.

[0039] On the contrary, Fig.12 As shown, when the working noise generated by the compressor 200 enters the air intake passage through the purified air outlet, a part of the sound waves is transmitted back from bottom to top through the main air intake passage L1, while the other part 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 the direction of the sound waves transmitted back through the main air intake passage L1 is an obtuse angle, that is, the direction of the sound waves transmitted through the branch air intake passage L2 is opposite to the direction of the sound waves transmitted through the main air intake passage L1, and because the sound waves of the two have the same frequency, they will cancel out at least part of the sound waves to achieve a silencing 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 a portable oxygen concentrator, 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. The air intake efficiency of the airflow flowing into the compressor can be promoted 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 an air intake filter element 2 is fixed between the cover plate 3 and the mounting base 1. The air intake passage 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, and 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 passage 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 integrally formed on the side of the cover plate 3 facing the air intake filter element 2, as shown in FIG. Fig. 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 as the mounting base can be integrated on the main frame 100 or the shell of the oxygen concentrator, and the cover plate 3 and the air intake filter element 2 are mounted on the mounting base 1. For example, in the preferred embodiment shown in the figure, the mounting base 1 is integrally formed on the main frame 100, and is formed with an air intake chamber 13 and an exhaust chamber 14 separated by a partition 12. At the same time, the ambient air inlet 11 connected to the air intake chamber 13 and the purified air outlet connected to the exhaust chamber 14 are also arranged on the mounting base 1. In other embodiments, the air intake assembly of the present invention can be set as a component relatively independent of the main frame 100, and installed in the oxygen concentrator in an assembled form.

[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. Among them, the ambient air inlet 11 can be arranged at the top of the air intake chamber 13 (based on Figures 1 to 3 It is understood that, although only a single ambient air inlet 11 is shown here, the air intake assembly of the present invention can also be formed to have an ambient air inlet composed of a plurality of small channels or hole groups.

[0044] In addition, the mounting base 1 is also formed or installed with an intake pipe 15 extending toward the intake chamber 13. The extension length of the intake pipe 15 in the intake chamber 13 can be 1 / 4 to 1 / 2 of the length of the intake chamber 13 in the corresponding direction, so that a better silencing effect can be achieved for noise with specific frequency components. The ambient air inlet 11 is connected to the intake chamber 13 by setting the intake pipe 15 to introduce ambient air into the intake chamber 13. The cross-sectional area of ​​the intake passage can be suddenly changed by the end of the intake pipe 15 facing the intake chamber 13, so that the cross-sectional area of ​​the intake passage is repeatedly reflected in the intake chamber 13, and at least part of the noise is blocked from being transmitted to the external environment through collision consumption. At the same time, due to the use of this resistant silencing method, it will not significantly increase the intake resistance like resistive silencing, so that both intake smoothness and quietness can be taken into account. The air intake pipe 15 may be integrally formed on the main frame 100 as a 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 inlet chamber 13 is located above the partition 12, and the air outlet chamber 14 is located below the partition 12. The air outlet chamber 14 is provided with a purified air outlet, which can be connected to the air inlet connector of the compressor 200. The mounting base 1 may also include related structures for connecting the cover plate 3, such as threaded holes 18, slots 17, etc., which will be described in detail later in conjunction with the cover plate 3.

[0046] Figure 7 The air intake filter element 2 in the air intake assembly of a preferred embodiment of the present invention is shown, and the air intake filter element 2 includes 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. 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 middle chamber 32, and the exhaust chamber 14 from the middle chamber 32, for example, it can be directly connected to the peripheral frame of the air intake chamber 13 and the exhaust chamber 14.

[0047] The soft rubber frame 21 of the air intake filter element 2 shown in the figure has structures corresponding to the periphery of the air intake chamber 13 and the exhaust chamber 14 and the partition 12 respectively. The soft rubber frame 21 not only serves as a connection contact for the air intake filter cotton 22, but also plays a sealing role 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 embedded in the annular groove 211, so that before the cover plate 3 is assembled to the mounting base 1, the air intake filter element 2 is pre-installed on the cover plate 3, thereby facilitating the 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 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 double-stage purification and 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 whole machine. In addition, even if one of the filter stages is damaged or otherwise fails (such as a connection gap) due to airflow impact, the other filter stage can be used to ensure the filtering of impurity particles in the ambient air, avoiding the risk of compressor damage due to failure to maintain 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 22, the soft rubber frame 21 may also have an intermediate sealing strip 212. Fig. 9 As shown, the cover plate 3 is formed with a supporting boss 34. In the assembled state, the supporting boss 34 presses 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 Fig. 9 The cover plate 3 in the air intake assembly of a preferred embodiment of the present invention is shown. The two ends of the cover plate 3 have an insert plate 35 and a through hole 36 respectively. When installing, firstly, 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, and the detachable installation of the cover plate 3 can also be realized.

[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. The push flow sound suppression 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 a plurality of push-flow sound-suppression baffles 31 are symmetrically distributed on both sides of the center line of the cover plate 3. Thus, 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 as strips extending obliquely downward, and are symmetrically arranged in an inverted figure eight shape on both sides of the center line, thereby playing the role of push-flow sound-suppression. Specifically, as Fig.11 As shown, when the airflow of the branch intake airflow channel L2 merges into the main intake airflow channel L1, the angle between the branch airflow direction and the main airflow direction is an acute angle, both of which are oriented toward the direction close to the purified air outlet, thereby accelerating the intake speed and improving the intake efficiency; Fig.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] Combination Figures 9 to 12 As shown, an annular frame 37 is formed on the side of the cover plate 3 facing the air intake filter element 2. The annular frame 37 can be, for example, generally rectangular and surrounds the plug-flow sound suppression baffle 31. The height of the protrusion toward the air intake filter element 2 is flush with the plug-flow sound suppression baffle 31. The multiple plug-flow sound suppression baffles 31 include alternately distributed partitioning plug-flow sound suppression baffles 311 and through-flow plug-flow sound suppression baffles 312. The partitioning plug-flow sound suppression baffles 311 extend from the annular frame 37 toward the center line of the cover plate 3. The through-flow plug-flow sound suppression baffles 312 are separated from the adjacent partitioning plug-flow sound suppression baffles 311 and the annular frame 37 to form a branch intake air flow channel L2 in the gap therebetween. Thus, as shown in FIG. Fig.11 As shown, the gas mainly flows through the main inlet flow channel L1 between the mutually symmetrical plug-flow sound suppression baffles 31, while part of the gas flows horizontally under the guidance of the plug-flow sound suppression baffle 31, and flows through the gaps between the adjacent through-flow plug-flow sound suppression baffles 312 and the separated plug-flow sound suppression baffles 311, and the gaps between the separated plug-flow sound suppression baffles 311 and the annular frame 37 in turn, and these gaps form the branch inlet flow channel 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, so that the converged airflow can speed up the air intake speed and improve the air intake efficiency.

[0054] On the contrary, Fig.12 As shown, when the working noise generated by the compressor 200 enters the air intake passage through the purified air outlet, a part of the sound waves is transmitted back from bottom to top through the main air intake passage L1, while the other part 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 the direction of the sound waves transmitted back through the main air intake passage L1 is an obtuse angle, that is, the direction of the sound waves transmitted through the branch air intake passage L2 is opposite to the direction of the sound waves transmitted through the main air intake passage L1, and because the sound waves of the two have the same frequency, they will cancel out at least part of the sound waves to achieve a silencing 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 respectively parallel to the center line of the cover plate 3 and two side faces 312b respectively facing the adjacent separation push-flow sound suppression baffle 311, and there is an angle of arc transition between the end face 312a and the side face 312b. 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 higher 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 is not only convenient for improving the space utilization rate in the limited space of the portable oxygen concentrator, but also ensures smooth air intake. The main air intake flow channel and the branch air intake flow channel separated by the push-flow sound suppression baffle and the sudden change of the channel interface when the plug-in internal pipe is passed into the air intake chamber prevent the compressor piston working noise from being transmitted back along the air path, which improves the quietness of the oxygen concentrator during operation, thereby bringing a better user experience. In addition, the air intake assembly can be set to have a two-stage filtering function, so that the ambient air is filtered twice before entering the compressor, which greatly reduces 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 whole machine.

[0057] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various specific technical features in any suitable manner. In order 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 the contents disclosed by the present invention and belong to the protection scope 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 passage to separate a main air intake passage (L1) and a branch air intake passage (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 passage (L2) and the sound waves transmitted back through the branch air intake passage (L2) are both directed toward a direction close to the purified air outlet when they merge into the main air intake passage (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 arranged 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 mounted 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 plate (12).

7. The air inlet assembly for a ventilation therapy device according to claim 2, characterized in that: The mounting base (1) is formed with a slot (17) and a threaded hole (18), and the two ends of the cover plate (3) are respectively provided with a plug plate (35) plugged into the 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 a ventilation therapy device 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 air channel (L1) and the branch intake air channel (L2) are formed in the intermediate chamber (32).

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

10. The air inlet assembly for a ventilation therapy device according to claim 9, characterized in that: The cover plate (3) is also provided with an annular frame (37) on one 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 a ventilation therapy device 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 provided 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 an air intake port of the compressor (200).

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