Air inlet structure of ventilation treatment equipment and ventilation treatment equipment

Abstract

The utility model relates to an air inlet structure of ventilation treatment equipment and the ventilation treatment equipment, and relates to the technical field of ventilation treatment. The air inlet structure of the ventilation treatment equipment and the ventilation treatment equipment comprise an air passage, and airflow flows in the air passage. The air resistance adjusting device is arranged in the air passage, and the air resistance adjusting device is configured to enable the air resistance when the air flow in the first direction flows in the air passage to be smaller than the air resistance when the air flow in the second direction flows in the air passage, wherein the airflow in the first direction and the airflow in the second direction are opposite in flowing direction, so that the airflow in the second direction is large in air resistance and difficult to transmit and pass through an air passage, the airflow in the second direction is effectively prevented from being transmitted outwards, and noise generated when the ventilation treatment equipment is used is reduced.

Description

Technical Field

[0001] This utility model relates to the field of ventilation therapy technology, and in particular to an air intake structure and ventilation therapy device. Background Technology

[0002] Ventilation therapy equipment provides patients with ventilation assistance and respiratory support. Existing ventilation therapy equipment, such as ventilators, typically uses a fan to deliver pressurized ventilation gas. However, fans are quite noisy, so noise reduction measures are necessary. Common noise reduction methods include covering the fan with noise-reducing materials to reduce fan noise. In practical use, it has been found that while covering the fan with noise-reducing materials can reduce the noise generated by the fan operation to some extent, it cannot reduce the noise generated by the patient's breathing airflow. Especially during patient exhalation, the direction of the exhaled airflow is roughly opposite to the direction of the airflow flowing into the ventilator. Therefore, the convergence of these two roughly opposite airflows easily generates significant shell noise around the ventilator chamber, resulting in excessive noise during patient exhalation. Utility Model Content

[0003] This utility model provides an air intake structure for a ventilation therapy device to solve at least one of the above-mentioned technical problems.

[0004] According to a first aspect of the present invention, the present invention provides an air intake structure for a ventilation therapy device and a ventilation therapy device, comprising:

[0005] Gas passage, wherein an airflow flows; and

[0006] An air resistance regulating device is disposed in the gas passage. The air resistance regulating device is configured such that the air resistance when the airflow flows in the first direction in the gas passage is less than the air resistance when the exhaled airflow flows in the second direction in the gas passage, wherein the airflow in the first direction and the airflow in the second direction are airflows with opposite flow directions.

[0007] In one embodiment, the airflow in the first direction is the inspiratory airflow inhaled by the patient end by the ventilation therapy device, and the airflow in the second direction is the expiratory airflow exhaled by the patient end.

[0008] In one embodiment, the air resistance regulating device is configured such that the cross-sectional area of ​​the gas passage when an inhalation flow is flowing in the gas passage is greater than the cross-sectional area of ​​the gas passage when an exhalation flow is flowing in the gas passage.

[0009] In one embodiment, the air resistance regulating device includes a one-way valve capable of blocking the air passage cross-section, the one-way valve being movably connected in the gas passage to change the cross-sectional area of ​​the gas passage at its location; the one-way valve is configured such that when an inhaled airflow flows in the gas passage, the inhaled airflow passes through the gas passage at the location of the one-way valve with a first cross-sectional area, and when an exhaled airflow flows in the gas passage, the exhaled airflow passes through the gas passage at the location of the one-way valve with a second cross-sectional area, wherein the second cross-sectional area is smaller than the first cross-sectional area.

[0010] In one embodiment, the one-way valve is configured to block at least two-thirds of the cross-sectional area of ​​the gas passage at its location when an exhaled airflow flows through the gas passage.

[0011] In one embodiment, the gas resistance regulating device further includes a rotating shaft rotatably connected to the gas passage, and the end of the one-way valve plate is provided with a connecting part, which is fixedly connected to the rotating shaft.

[0012] In one embodiment, the one-way valve is configured such that when an inhaled airflow flows in the gas passage, the one-way valve opens to increase the cross-sectional area of ​​the gas passage at its location; and when an exhaled airflow flows in the gas passage, the one-way valve closes to decrease the cross-sectional area of ​​the gas passage at its location.

[0013] In one embodiment, a limiting element is provided in the gas passage, and the one-way valve is located on one side of the limiting element. When an inhalation airflow flows in the gas passage, the one-way valve is at least partially away from the limiting element to be in an open state. When an exhalation airflow flows in the gas passage, the one-way valve abuts against the limiting element to be in a closed state.

[0014] According to a second aspect of the present invention, the present invention provides a ventilation therapy device, including the air intake structure of the ventilation therapy device described above.

[0015] In one embodiment, the device further includes a fan assembly and a noise reduction housing. The fan assembly is disposed within the noise reduction housing. The noise reduction housing includes an air inlet communicating with external air. The fan assembly includes an air intake. A gas passage is provided within the noise reduction housing between the air inlet and the air intake. External air outside the noise reduction housing is transmitted to the air intake through the gas passage.

[0016] Compared with the prior art, the advantage of this utility model is that, since the air resistance adjustment device in the gas passage can form different sizes of air resistance when the airflow flows in roughly opposite directions in the gas passage, the air resistance of the second direction airflow is larger and more difficult to transmit through the gas passage, thereby effectively hindering the outward transmission of the second direction airflow and reducing the noise when the ventilation therapy equipment is used. Attached Figure Description

[0017] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings.

[0018] Figure 1 This is a three-dimensional structural diagram of the ventilation therapy device in an embodiment of this utility model;

[0019] Figure 2 This is a cross-sectional view of the ventilation therapy device in an embodiment of this utility model;

[0020] Figure 3 This is a top view of the ventilation therapy device's air intake structure installed in the ventilation therapy device according to an embodiment of the present invention, wherein the air resistance adjustment device is in the closed state;

[0021] Figure 4 This is a three-dimensional sectional view of the air intake structure of the ventilation therapy device installed in the ventilation therapy device in an embodiment of the present invention, wherein the air resistance adjustment device is in the closed state;

[0022] Figure 5 yes Figure 3 A schematic diagram of the three-dimensional structure of the air resistance adjustment device shown;

[0023] Figure 6 This is a top view of the ventilation therapy device in an embodiment of the present invention, showing the air intake structure of the ventilation therapy device installed in the ventilation therapy device, wherein the air resistance adjustment device is in the open state;

[0024] Figure 7 This is a three-dimensional sectional view of the air intake structure of the ventilation therapy device installed in the ventilation therapy device in an embodiment of the present invention, wherein the air resistance adjustment device is in the open state.

[0025] Figure label:

[0026] 1. Gas passage; 2. Gas resistance regulator; 3. Ventilator;

[0027] 11. Limiting components;

[0028] 21. One-way valve plate; 22. Rotary shaft; 23. Connecting part;

[0029] 30. Noise-reducing housing; 31. Fan assembly; 32. Upper housing; 33. Middle housing; 34. Lower housing; 35. Air inlet; 36. Air outlet; 37. Flow monitoring device;

[0030] 311. Air intake;

[0031] 301. First chamber; 302. Second chamber; 303. Third chamber. Detailed Implementation

[0032] The present invention will be further described below with reference to the accompanying drawings.

[0033] like Figures 1-7 As shown, this utility model provides an air intake structure for a ventilation therapy device, which is constructed within the device to address the problem of excessive noise from the device during patient exhalation. The ventilation therapy device can be, for example, a ventilator, an oxygen therapy device, etc.

[0034] like Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, the air intake structure of the ventilation therapy device of this utility model includes a gas passage 1 and an air resistance adjustment device 2. Airflow in a first direction or a second direction flows through the gas passage 1, with the flow directions of the first and second directions being approximately opposite. For example, the first direction airflow is the inspiratory airflow actively inhaled by the patient at the ventilation therapy device, and the second direction airflow is the expiratory airflow at the patient. It should be noted that all references to inspiratory airflow in this utility model refer to the airflow inhaled by the patient when using the ventilation therapy device. Specifically, when inspiratory airflow flows through the gas passage 1, it corresponds to the ventilation therapy device providing ventilation gas to the patient, i.e., the patient's inspiratory mode; when expiratory airflow flows through the gas passage 1, it corresponds to the patient's expiratory mode. Therefore, it can be understood that the inspiratory and expiratory airflows in the gas passage 1 are airflows with approximately opposite flow directions.

[0035] The air resistance regulating device 2 is installed in the gas passage 1. The air resistance regulating device 2 is configured such that the air resistance when the inhaled airflow flows in the gas passage 1 is less than the air resistance when the exhaled airflow flows in the gas passage 1. That is, the air resistance when the inhaled airflow flows in the gas passage 1 is different from the air resistance when the exhaled airflow flows in the gas passage 1, and the air resistance when the exhaled airflow flows in the gas passage 1 is greater.

[0036] Since the direction of the inspiratory airflow is consistent with the direction of the external airflow flowing into the ventilation therapy device when the fan assembly 31 is working, the superposition of the two airflows with the same direction is unlikely to generate significant shell noise. However, the direction of the expiratory airflow is roughly opposite to the direction of the external airflow flowing into the ventilation therapy device when the fan assembly 31 is working. When the two airflows in opposite directions converge, they will generate significant noise. Moreover, if the two airflows converge within the chamber or shell where the fan assembly 31 is located, they will further generate significant shell noise. Therefore, without corresponding noise reduction measures, it will affect the patient's user experience. Based on this, the present invention solves the above problems by setting up an air resistance adjustment device 2. When the expiratory airflow flows through the gas passage 1 to the patient end, most of the expiratory airflow is blocked by the air resistance adjustment device 2. During this process, the expiratory airflow is reflected and refracted within the space blocked by the air resistance adjustment device 2, and will not be conducted outside the ventilation therapy device, thereby achieving the purpose of noise reduction.

[0037] To achieve the goal of changing the air resistance of gas passage 1, the air resistance regulating device 2 is configured such that the cross-sectional area of ​​gas passage 1 when inhalation airflow flows in gas passage 1 is greater than the cross-sectional area of ​​gas passage 1 when exhalation airflow flows in gas passage 1. In other words, the air resistance regulating device 2 can change the air resistance of gas passage 1 by changing the cross-sectional area of ​​gas passage 1 at its location.

[0038] More specifically, such as Figure 5 As shown, the air resistance regulating device 2 includes a one-way valve plate 21 that can block the air passage cross section of the gas passage 1. The one-way valve plate 21 can be a roughly rectangular sheet structure with a small thickness, so as not to obstruct the airflow when the airflow passes through the gas passage 1. Alternatively, the one-way valve plate 21 can also be a circular sheet structure, an elliptical sheet structure, etc., which can be adapted to the shape of the radial cross section of the gas passage 1.

[0039] In one embodiment, the one-way valve plate 21 is rotatably connected to the gas passage 1. In other embodiments, the one-way valve plate 21 may also be movably connected to the gas passage 1 by means of elastic movement, etc. The purpose of movably connecting the one-way valve plate 21 to the gas passage 1 is to change the cross-sectional area of ​​the gas passage 1 at its location. The one-way valve plate 21 is configured such that when an inhaled airflow flows in the gas passage 1, the inhaled airflow passes through the gas passage 1 at the location of the one-way valve plate 21 with a first cross-sectional area, and when an exhaled airflow flows in the gas passage 1, the exhaled airflow passes through the gas passage 1 at the location of the one-way valve plate 21 with a second cross-sectional area, wherein the second cross-sectional area is smaller than the first cross-sectional area. That is, when inhaled airflow flows in gas passage 1, the one-way valve 21 rotates in a first direction (e.g., clockwise) from its natural state when not subjected to airflow force to increase the cross-sectional area of ​​the gas passage. When exhaled airflow flows in the gas passage, the position of the one-way valve 21 at its maximum displacement caused by the previous inhaled airflow rotates in a second direction opposite to the first direction (e.g., counterclockwise) to decrease the cross-sectional area of ​​the gas passage 1. In other words, the one-way valve 21 is configured such that when inhaled airflow flows in gas passage 1, the one-way valve 21 opens to increase the cross-sectional area of ​​the gas passage 1 at its location; and when exhaled airflow flows in gas passage 1, the one-way valve 21 closes to decrease the cross-sectional area of ​​the gas passage 1 at its location.

[0040] Please combine Figure 3 and Figure 4 The upper end of the one-way valve plate 21 is rotatably connected to the gas passage 1. Therefore, the one-way valve plate 21 can rotate relative to the gas passage 1 to the closed state. At this time, a part (or all) of the ventilation section of the gas passage 1 is covered by the one-way valve plate 21. Therefore, the exhaled gas flowing in it is blocked by the one-way valve plate 21 and can only flow through the part of the gas passage 1 not covered by the one-way valve plate 21. Therefore, the exhaled gas will pass through the gas passage 1 with greater air resistance.

[0041] Please combine Figure 6 and Figure 7 The one-way valve plate 21 is rotatably connected to the gas passage 1. Therefore, the one-way valve plate 21 can be rotated to the open state relative to the gas passage 1. At this time, the gas passage 1 is not covered by the one-way valve plate 21, so the inhaled gas flowing in it can pass through the gas passage 1 with less air resistance than the exhaled gas.

[0042] Furthermore, such as Figure 6 and Figure 7As shown, due to the limitations of the installation position, the one-way valve plate 21 can rotate clockwise relative to the gas passage 1 to the open state. The angle of clockwise rotation relative to the gas passage 1 can be from 0° to 90°. Preferably, the one-way valve plate 21 rotates clockwise relative to the gas passage 1 at 90°, that is, the one-way valve plate 21 rotates relative to the gas passage 1 to a position parallel to the axial direction of the gas passage 1. At this time, the gas passage 1 is fully opened, and its actual ventilation cross-sectional area is the radial cross-sectional area of ​​the gas passage 1 (e.g.,...). Figure 3 As shown, the diameter of gas passage 1 is D, and its radial cross-sectional area is π(D / 2). 2 ).

[0043] like Figure 3 and Figure 4 As shown, when the one-way valve plate 21 can rotate counterclockwise relative to the gas passage 1 to the closed state, its maximum rotation position is perpendicular to the axial direction of the gas passage 1. At this time, the gas passage 1 can be completely blocked by the one-way valve plate 21, and the ventilation cross-sectional area of ​​the gas passage 1 is 0; or the gas passage 1 can be only partially blocked by the one-way valve plate 21, and the actual ventilation cross-sectional area of ​​the gas passage 1 is (radial cross-sectional area of ​​the gas passage 1 - cross-sectional area of ​​the one-way valve plate 21).

[0044] Preferably, the one-way valve plate 21 is configured to block at least 2 / 3 of the ventilation cross-section area of ​​the gas passage 1 when the exhaled airflow flows in the gas passage 1, but does not block the entire ventilation cross-section area of ​​the gas passage 1, that is, the second cross-sectional area as described above is 1 / 3 of the ventilation cross-section area. In other words, the one-way valve plate 21 only covers a portion of the ventilation cross-section of the gas passage 1.

[0045] like Figure 4 As shown, the radial dimension of the one-way valve plate 21 in the gas passage 1 is smaller than the radial diameter of the gas passage 1. This means that even when the one-way valve plate 21 can be rotated counterclockwise relative to the gas passage 1 to the closed state, there is still a certain distance between the lower end of the one-way valve plate 21 and the inner wall of the gas passage 1 to form a ventilation cross-section for expiratory gas. The reason for this arrangement is that if the gas passage 1 is completely blocked by the one-way valve plate 21, i.e., the ventilation cross-sectional area of ​​the gas passage 1 is 0, it will cause excessive air resistance in the gas passage 1, making it difficult for the patient to exhale and reducing their comfort. Therefore, by having the one-way valve plate 21 only block a portion of the ventilation cross-section of the gas passage 1, for example, blocking 2 / 3 of the ventilation cross-section area, the unblocked portion of the gas passage 1 can be used to flow expiratory gas, thereby ensuring user comfort.

[0046] like Figure 4As shown, when the one-way valve 21 is closed, it completely blocks the gas passage 1 in the length direction but not in the width direction, so exhaled gas can flow from the lower end of the one-way valve 21 into the gas passage 1. Alternatively, when the one-way valve 21 is closed, it does not completely block the gas passage 1 in the length direction but does completely block it in the width direction, so exhaled gas can flow from the left or right end (or both ends) of the one-way valve 21 into the gas passage 1. Or, when the one-way valve 21 is closed, it does not completely block the gas passage 1 in the length direction or in the width direction, so exhaled gas can flow from the left, right, upper, or lower end of the one-way valve 21 into the gas passage 1.

[0047] like Figure 5 As shown, the gas resistance regulating device 2 also includes a rotating shaft 22 rotatably connected to the gas passage 1. A connecting portion 23 is provided at the end of the one-way valve plate 21, and the connecting portion 23 is fixedly connected to the rotating shaft 22. The connecting portion 23 can be a columnar structure slightly bent towards one side of the one-way valve plate 21. The rotating shaft 22 is fixed to the end of the connecting portion 23 so that a gap can be formed between it and the upper end of the one-way valve plate 21, thereby facilitating the rotation of the one-way valve plate 21.

[0048] like Figure 4 As shown, a limiting element 11 is provided in the gas passage 1, extending radially along the gas passage 1. A rotating shaft 22 is rotatably disposed within the limiting element 11, and a one-way valve plate 21 is located on one side of the limiting element 11. When the one-way valve plate 21 rotates in the first direction, it moves away from the limiting element 11, as... Figure 7 As shown; when the one-way valve plate 21 rotates in the second direction, it approaches the limiting member 11 and rotates until it abuts against the limiting member 11.

[0049] In embodiments where no limiting element 11 is provided in the gas passage 1, a one-way valve plate 21 is installed in the gas passage 1. When the one-way valve plate 21 is not under natural force, that is, in the closed state, it acts as a shield for the gas passage 1 at its location.

[0050] Specifically, the limiting member 11 can be configured as two parallel baffles. These two parallel baffles can, on the one hand, form an air passage in the gas passage 1, thereby guiding the gas; on the other hand, they can also provide support for the mounting shaft 22 and limit the rotation of the one-way valve 21 in the second direction, that is, the maximum position of the one-way valve 21 in the second direction is when it abuts against one side of the baffle (e.g., ...). Figure 4 (As shown), thus preventing the one-way valve plate 21 from rotating in the second direction beyond its closed position, which would cause the air resistance to increase again.

[0051] like Figure 4 and Figure 6As shown, the rotating shaft 22 of the one-way valve plate 21 is installed between two baffles, and the distance between the two baffles is less than the axial direction of the rotating shaft 22 to ensure that the rotating shaft 22 will not come out from between them. The two ends of the rotating shaft 22 can be respectively set in grooves or holes on the two baffles, and can rotate within the grooves or holes. Bearings or other components that promote the rotation of the rotating shaft 22 can be installed in the grooves or holes on the baffles.

[0052] Gas passage 1 is a gas passage located before the air intake of the fan assembly in the ventilation therapy device. Its specific location can be selected according to the space in the ventilation therapy device.

[0053] like Figures 3-6 In the illustrated embodiment, a one-way valve 21 is provided in the gas passage 1, and one end (e.g., the upper end) of the one-way valve 21 is rotatably connected to the gas passage 1, meaning that the lower end of the one-way valve 21 can rotate relative to its upper end to open or close. When an inhalation airflow flows in the gas passage 1, the one-way valve 21 is at least partially away from the limiting member 11 to be in the open state; when an exhalation airflow flows in the gas passage 1, the one-way valve 21 abuts against the limiting member 11 to be in the closed state. It should be noted that, in the preferred embodiment, when the one-way valve 21 is in the closed state, it does not completely close and block the gas passage 1 at the location of the one-way valve 21, but rather reduces the cross-sectional area of ​​the gas passage 1 at that location compared to the open state.

[0054] In the embodiment where the one-way valve plate 21 is rotatably connected to the gas passage 1, the one-way valve plate 21 is in the open state when one end is connected to the limiting member 11 or in the gas passage 1, and the other end rotates relative to its fixed end to open the gas passage 1 at its location; when in the closed state, the rotating end is reset to close the gas passage 1 at part of its location.

[0055] When the one-way valve plate 21 is connected to the limiting member 11 or the gas passage 1 by a spring, the one-way valve plate 21 can be in the open state by moving away from the limiting member 11 under the action of the inhaled airflow; the one-way valve plate 21 can be in the closed state by moving closer to the limiting member 11 under the action of the exhaled airflow.

[0056] It is conceivable that two one-way valves 21 can also be set in the gas passage 1. The two one-way valves 21 give the gas passage 1 a certain safety redundancy, ensuring that even if one of the one-way valves 21 cannot be opened normally, the exhaled airflow can still flow through the other one-way valve 21.

[0057] Specifically, the upper end of one of the one-way valve plates 21 can be rotatably connected to the gas passage 1, and the lower end of the other one-way valve plate 21 can be rotatably connected to the gas passage 1. That is, the two one-way valve plates 21 are arranged opposite each other in the radial direction of the gas passage 1. When the two one-way valve plates 21 are rotated to the open or closed state, they rotate in opposite directions. Furthermore, there can be a gap between the two one-way valve plates 21. That is, when both one-way valve plates 21 are rotated to the closed state, the gas passage 1 is not completely blocked. The gap between them can also be used to allow exhaled gas to pass through, thereby avoiding discomfort symptoms such as shortness of breath for the patient.

[0058] like Figure 1 and Figure 2 As shown, this utility model also provides a ventilation therapy device, including the air intake structure of the ventilation therapy device described above, and further including a fan assembly 31 and a noise reduction housing 30. The fan assembly 31 is disposed inside the noise reduction housing 30. The noise reduction housing 30 includes an air inlet 35 communicating with the outside air. The fan assembly 31 includes an air inlet 311. A gas passage 1 is provided inside the noise reduction housing 30 between the air inlet 35 and the air inlet 311. The outside air outside the noise reduction housing 30 is transmitted to the air inlet 311 through the gas passage 1.

[0059] Ventilation therapy equipment can be a ventilator, such as... Figure 1 and Figure 2 As shown, the noise-reducing housing 30 of the ventilator 3 includes an upper housing 32, a middle housing 33, and a lower housing 34. A first sealed chamber 301 is formed between the lower housing 34 and the middle housing 33, and a second sealed chamber 302 is formed between the upper housing 32 and the middle housing 33. A third sealed chamber 303 is constructed in the middle housing 33. The first chamber 301 is in fluid communication with the second chamber 302, and the second chamber 302 is in fluid communication with the third chamber 303. The fan assembly 31 is located in the second chamber 302, and the air inlet 311 of the fan assembly 31 is exposed in the third chamber 303 to be in fluid communication with the third chamber 303. By providing the above-mentioned multiple chambers, the noise of the fan assembly 31 in the ventilator 3 can be reduced.

[0060] like Figure 1 and Figure 3 As shown, the lower shell 34 is also provided with an air inlet 35, which is in fluid communication with the first chamber 301. The upper shell 32 is provided with an air outlet 36, which is in fluid communication with the air outlet of the fan assembly 31.

[0061] External air outside the noise-reducing housing 30 enters the ventilator 3 through the air inlet 35, and then passes through the first chamber 301, the second chamber 302 and the third chamber 303 in sequence. It then enters the fan assembly 31 through the air inlet 311 for pressurization. The pressurized air can be output through the air outlet 36 for the patient to breathe.

[0062] Understandably, the airflow in the first direction mentioned above is the inhalation airflow in the direction of the patient's inhalation, that is, the external air that enters the noise reduction housing 30 along the air inlet 35 and flows to the air inlet 311; the airflow in the second direction is the exhalation airflow in the direction of the patient's exhalation, that is, the air exhaled by the patient and transmitted in the noise reduction housing 30 in the opposite direction to the inhalation direction.

[0063] Therefore, it can be seen that the first chamber 301, the second chamber 302, and the third chamber 303 mentioned above are all gas paths located before the air intake of the fan assembly 31. Thus, the gas passage 1 can be constructed in any one or more of the first chamber 301, the second chamber 302, and the third chamber 303. For example... Figure 3 As shown, since the gas passage 1 formed in the first chamber 301 is a relatively regular airway, it has good space to set up the air resistance adjustment device 2. Moreover, the air inlet 35 of the noise reduction housing 30 is located in the first chamber 301. Therefore, setting the air resistance adjustment device 2 in the airway forming the gas passage 1 in the first chamber 301 can effectively prevent the exhalation airflow noise from being transmitted to the outside of the noise reduction housing 30 through the air inlet 35.

[0064] More specifically, a flow monitoring device 37 is installed in the air passage forming the gas passage 1 in the first chamber 301. The air resistance adjustment device 2 can be installed near the air inlet side of the flow monitoring device 37 to avoid affecting the monitoring results of the flow monitoring device 37.

[0065] Although the present invention has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An air intake structure of a ventilation therapy apparatus, characterized by, The ventilation therapy device comprises: a gas passage in which a gas flow flows; and a gas resistance adjusting device arranged in the gas passage, the gas resistance adjusting device being configured such that a gas resistance when a first direction gas flow flows in the gas passage is smaller than a gas resistance when a second direction gas flow flows in the gas passage, wherein the first direction gas flow and the second direction gas flow are gas flows in opposite directions.

2. An air intake structure for a ventilation therapy device according to claim 1, characterized in that The first direction gas flow is an inhalation gas flow inhaled by a patient end from the ventilation therapy device, and the second direction gas flow is an exhalation gas flow exhaled by the patient end.

3. An air intake structure for a ventilation therapy device according to claim 2, wherein, The gas resistance adjusting device is configured such that a ventilation cross-sectional area of the gas passage when the inhalation gas flow flows in the gas passage is larger than a ventilation cross-sectional area of the gas passage when the exhalation gas flow flows in the gas passage.

4. An air intake structure for a ventilation therapy device according to claim 2 or 3, characterized in that The gas resistance adjusting device comprises a one-way valve plate capable of blocking the ventilation cross section of the gas passage, the one-way valve plate being movably connected in the gas passage to change a cross-sectional area of the gas passage at the position thereof; the one-way valve plate is configured such that when the inhalation gas flow flows in the gas passage, the inhalation gas flow passes through the gas passage at the position of the one-way valve plate with a first cross-sectional area, and when the exhalation gas flow flows in the gas passage, the exhalation gas flow passes through the gas passage at the position of the one-way valve plate with a second cross-sectional area, wherein the second cross-sectional area is smaller than the first cross-sectional area.

5. An air intake structure for a ventilation therapy device according to claim 4, wherein, The one-way valve plate is configured to block at least 2 / 3 of the ventilation cross section of the gas passage at the position thereof when the exhalation gas flow flows in the gas passage.

6. An air intake structure for a ventilation therapy device according to claim 4, wherein, The gas resistance adjusting device further comprises a rotating shaft rotationally connected with the gas passage, and an end of the one-way valve plate is provided with a connecting portion fixedly connected with the rotating shaft.

7. An air intake structure for a ventilation therapy device according to claim 4, wherein, The one-way valve plate is configured to be opened to increase the cross-sectional area of the gas passage at the position thereof when the inhalation gas flow flows in the gas passage, and to be closed to decrease the cross-sectional area of the gas passage at the position thereof when the exhalation gas flow flows in the gas passage.

8. An air intake structure for a ventilation therapy device according to claim 7, wherein, A limiting member is arranged in the gas passage, the one-way valve plate is located on one side of the limiting member, the one-way valve plate is at least partially away from the limiting member to be in an open state when the inhalation gas flow flows in the gas passage, and the one-way valve plate abuts against the limiting member to be in a closed state when the exhalation gas flow flows in the gas passage.

9. A ventilation therapy apparatus characterised in that, The ventilation therapy device comprises the air inlet structure of any one of claims 1-8.

10. The ventilation therapy device of claim 9, wherein, The ventilation therapy device further comprises a fan assembly and a noise reduction shell, the fan assembly is arranged in the noise reduction shell, the noise reduction shell comprises an air inlet communicating with external air, the fan assembly comprises an air inlet, and the noise reduction shell is provided with the gas passage between the air inlet and the air inlet outside the noise reduction shell, and external air is transmitted to the air inlet through the gas passage.

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