WO2024093006A1 - Air duct assembly for ventilator and portable ventilator - Google Patents

Abstract

Provided are an air duct assembly for a ventilator and a portable ventilator. The air duct assembly comprises an air duct body (1) and an air blower (2). The air duct body (1) is provided with a low-pressure chamber and a high-pressure chamber (14), and an air inlet (118) and an air outlet. The air blower (2) is in communication with the low-pressure chamber and the high-pressure chamber (14). The low-pressure chamber comprises a first low-pressure chamber (11), a second low-pressure chamber (12), and a third low-pressure chamber (13) that are arranged in sequence and in communication with each other. The first low-pressure chamber (11) is in communication with the air inlet (118). The third low-pressure chamber (13) is in communication with the air blower (2). The air duct body (1) is provided with a first separator plate (15) for separating the first low-pressure chamber (11) and the second low-pressure chamber (12) and a second separator plate (16) for separating the second low-pressure chamber (12) and the third low-pressure chamber (13). The first separator plate (15) is provided with a first vent hole set (17). The second separator plate (16) is provided with a second vent hole set (18). The air duct body (1) provides a greatly elongated air path in the limited space. The twisting air path increases the length of sound transmission and thus the difficulty of sound transmission. Since the sound volume may be significantly reduced or eliminated at sharp bends, the present invention features a good noise-reduction effect.

Description

A ventilator air duct assembly and a portable ventilator

This application claims the priority of the Chinese patent application filed with the China Patent Office on October 31, 2022, with application number 202211349611.8 and invention name "A ventilator air duct assembly and a portable ventilator", the entire contents of which are incorporated by reference in this application.

Technical Field

The present application relates to the field of medical equipment, and in particular to a ventilator air duct assembly and a portable ventilator.

Background technique

With the development of science and technology and the improvement of quality of life, the use of ventilators has been promoted, making them not only used in the treatment of critically ill patients and emergency resuscitation, but also widely used in the home. For example, users can wear ventilator equipment at night to improve breathing quality during sleep.

Traditional medical ventilators, due to their large size, inconvenient storage and carrying, and high price, often cannot meet the needs of users for home use. Therefore, small portable ventilators have appeared on the market.

Portable ventilators use turbine fans to produce compressed air and then deliver breathable air to users. During the compressed air production process, the high-speed rotation of the turbine fan blades will generate large vibration noise and aerodynamic noise. These noises will be transmitted outward through the fan and will seriously affect the sleep quality of the sleeper.

In addition, due to the size of the portable ventilator, the length of the internal air duct of the ventilator is relatively short, so the airflow in the duct is large and fast, which will produce a strong whistling sound. Therefore, during use, the vibration noise of the blades is mixed with the airflow noise. Users often use the ventilator at night, so users can clearly feel the interference of noise, which seriously affects the user's sleep quality and user experience.

Summary of the invention

The present application provides a ventilator air duct assembly and a portable ventilator to solve the problem of loud noise and poor user experience when the portable ventilator is in operation.

The technical solution adopted in this application is:

A ventilator air duct assembly comprises an air duct main body and a blower, the air duct main body is provided with a low-pressure chamber and a high-pressure chamber, the air duct main body is also provided with an air inlet connected to the low-pressure chamber and an air outlet connected to the high-pressure chamber, the air inlet of the blower is connected to the low-pressure chamber, and the air outlet of the blower is connected to the high-pressure chamber; the low-pressure chamber comprises a first low-pressure chamber, a second low-pressure chamber and a third low-pressure chamber which are connected in sequence, the first low-pressure chamber is connected to the air inlet, and the third low-pressure chamber is connected to the air inlet of the blower; the air duct main body is provided with a first partition separating the first low-pressure chamber and the second low-pressure chamber, and a second partition separating the second low-pressure chamber and the third low-pressure chamber, the first partition is provided with a first ventilation hole group, and the second partition is provided with a second ventilation hole group.

The first low-pressure chamber includes a rectifying area and a first arc-shaped area, and the first low-pressure chamber is provided with a first baffle rib separating the rectifying area and the first arc-shaped area.

A second flow-blocking rib is also arranged inside the flow-rectifying area.

The rectification area is further provided with baffle ribs, and the baffle ribs cooperate with the inner wall of the rectification area to form a silencer cavity, and the baffle ribs are provided with openings communicating with the silencer cavity.

The first ventilation hole group includes a plurality of first ventilation holes, and the axis of the air inlet is perpendicular to the axis of the first ventilation holes.

The second low-pressure chamber includes a second arc-shaped area and a third arc-shaped area. A separating rib assembly is also provided in the second low-pressure chamber to separate the second arc-shaped area and the third arc-shaped area. The first ventilation hole group is arranged in the second arc-shaped area, and the second ventilation hole group is arranged in the third arc-shaped area.

The first low-pressure chamber includes a first arc-shaped area, the first arc-shaped area is located on the upper side of the second arc-shaped area, and the third arc-shaped area is located on the inner side of the second arc-shaped area; the third low-pressure area is located on the upper side of the third arc-shaped area.

The dividing rib assembly includes a plurality of dividing ribs arranged at intervals, with a flow gap between two adjacent dividing ribs, one of the first ventilation hole group and the second ventilation hole group is arranged corresponding to the dividing rib, and the other of the two is arranged corresponding to the flow gap.

A first guide protrusion is provided at the first ventilation hole group, and the first guide protrusion has a first guide transition surface on the side facing the first ventilation hole group; and/or a second guide protrusion is provided at the second ventilation hole group, and the second guide protrusion has a second guide transition surface on the side facing the second ventilation hole group.

The first low-pressure chamber surrounds the outer circumference of a partial area of the third low-pressure chamber.

The ventilator air duct assembly also includes a fan buffer seat and a filling block. The blower is fixed to the fan buffer seat. The outer periphery of the fan buffer seat is provided with drainage ribs. The filling block is arranged at the air inlet of the blower. The filling block is a structure made of elastic material and has multiple throttling holes.

The ventilator air duct assembly also includes a laminar flow tube and a laminar flow component connected to the laminar flow tube, the laminar flow component is connected to the air outlet of the high-pressure chamber, and a plurality of diversion ports are provided on the windward surface of the laminar flow component.

The present application also discloses a portable ventilator, comprising a base, a cover body, and a humidification tank assembly. The ventilator also includes the above-mentioned ventilator air duct assembly. The base and the cover body cooperate to form an installation cavity. The air duct assembly is arranged in the installation cavity. The outlet of the high-pressure cavity is connected to the humidification tank assembly.

Due to the adoption of the above technical solution, the beneficial effects achieved by this application are as follows:

1. The present application divides the low-pressure chamber in the air duct body into a first low-pressure chamber, a second low-pressure chamber and a third low-pressure chamber which are connected in sequence through a first partition and a second partition. After the external airflow enters the air duct body from the air inlet, it flows through the first low-pressure chamber, the second low-pressure chamber and the third low-pressure chamber in sequence to enter the high-pressure chamber for pressurization and flows out, which greatly lengthens the air path length in the extremely limited space of the air duct body, and the setting of the first vent group and the second vent group achieves the effect of reducing noise and increasing the difficulty of sound wave transmission. When the airflow flows between the low-pressure chambers, there are multiple air intakes and exhausts, and the air path is tortuous, which lengthens the path of sound transmission, greatly increasing the difficulty of sound transmission from the air duct body, and the sound will be significantly reduced or eliminated when making a large angle turn, which has a good noise reduction and silencing effect.

In addition, since the airflow turns multiple times in the air duct body and needs to pass through the first vent group and the second vent group when flowing between the low-pressure chambers, the vent group diverts the airflow, so that the airflow flows more dispersedly and evenly through the various vent groups, avoiding the whistling sound caused by the large amount of air flow converging, and reducing the flow rate of the airflow to a certain extent, thereby further reducing the noise generated during the flow of the airflow.

2. As a preferred embodiment of the present application, the first low-pressure chamber includes a rectifying area and a first arc-shaped area, and the first low-pressure chamber is provided with a first baffle rib separating the rectifying area and the first arc-shaped area. The air duct body is adapted to the shape of the turbo blower, and both are circular, so as to realize the miniaturized design of the air duct body. At the same time, the first low-pressure chamber has an arc-shaped area, so that the length of the first low-pressure chamber is extended within the limited volume of the air duct body, so that the airflow is buffered during the flow in the first low-pressure chamber, the noise generated by the flow of the airflow is reduced, and the airflow in the first low-pressure chamber is uniformly dispersed through the first vent group into the second low-pressure chamber, so as to realize diversion and noise reduction. In addition, there is a first baffle rib between the rectifying area and the first arc-shaped area, so as to form an airflow corner between the rectifying area and the first arc-shaped area. After entering the first low-pressure chamber, the airflow is blocked by the first baffle rib, and after making a large angle turn to bypass the first baffle rib, it enters the first arc-shaped area and flows along the extension direction of the first arc-shaped area. The tortuosity of the noise transmission path is further increased, the noise transmission path is lengthened, and at the same time the airflow turns at a larger angle, which can reduce the flow rate of the airflow and reduce the noise generated by the airflow.

3. As a preferred embodiment of the present application, the second low-pressure chamber includes a second arc-shaped area and a third arc-shaped area. A dividing rib assembly is further provided in the second low-pressure chamber to separate the second arc-shaped area and the third arc-shaped area. The first vent group is arranged in the second arc-shaped area, and the second vent group is arranged in the third arc-shaped area. The dividing rib assembly divides the second low-pressure chamber into two arc-shaped areas, and the two groups of vent groups are respectively located in the two arc-shaped areas. While conforming to the overall shape and structure of the air duct assembly, the degree of tortuosity of the airflow flow path in the second low-pressure chamber is further increased, and the airflow entering the second low-pressure chamber is buffered again. After the airflow enters the second low-pressure chamber from the first vent group, it will not directly pass through the second vent group to enter the third low-pressure chamber, but will flow horizontally under the obstruction of the dividing rib assembly until it bypasses the dividing rib assembly before entering the third arc-shaped area. This further extends the length of the air duct and increases the difficulty of noise transmission.

4. As a preferred embodiment of the present application, a first guide protrusion is provided at the first vent group, and a first guide transition surface is provided on the side of the first guide protrusion facing the first vent group; and/or a second guide protrusion is provided at the second vent group, and a second guide transition surface is provided on the side of the second guide protrusion facing the second vent group. The first guide transition surface and/or the second guide transition surface cooperate with the separation rib assembly to control and guide the flow direction of the airflow in a more detailed manner, while reducing the transmission of noise, increasing the stability of the internal airflow, reducing the fluctuation of the gas flow, and making the airflow flow smoother. At the same time, the guide transition surface can reduce the flow resistance, and can control the direction of the airflow, affecting the path of sound propagation, so that the sound propagates in a direction that is conducive to silence, which helps to reduce noise.

5. As a preferred embodiment of the present application, the ventilator air duct assembly also includes a fan buffer seat and a filling block, the blower is fixed to the fan buffer seat, the outer periphery of the fan buffer seat is provided with drainage ribs, the filling block is provided at the air inlet of the blower, the filling block is a structure made of elastic material, and the filling block is provided with a plurality of throttle holes. The fan buffer seat can reduce the vibration of the air blowing member through the vibration transmission between solids, and transmit it to the internal components of the ventilator, while contributing to the shock absorption and noise reduction of the high-pressure chamber, and reducing the noise generated by vibration. In addition, reducing vibration also contributes to the stable flow of airflow, and improves the stability and accuracy of the ventilator sensor readings. At the same time, the drainage ribs on the periphery of the fan buffer seat can also guide the airflow, so that the airflow enters the interior of the air blowing member along a preset path. A filling block is provided at the air inlet of the blower. On the one hand, the filling block can further absorb and buffer the vibration of the blower and reduce vibration noise. On the other hand, the filling block is provided with a throttle hole so that the airflow is diverted again before entering the blower, so that the airflow enters the blower evenly and dispersedly, avoiding the high-speed rotating blades of the blower colliding with the high-speed airflow with a large flow rate and producing noise.

BRIEF DESCRIPTION OF THE DRAWINGS

The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

FIG1 is a schematic structural diagram of an air duct assembly in one embodiment of the present application;

FIG2 is a schematic diagram of the internal structure of the air duct assembly in FIG1 , wherein arrows indicate the direction of air flow;

FIG3 is a cross-sectional view of an air duct body according to an embodiment of the present application;

FIG4 is a schematic diagram of the structure of the first low-pressure chamber in an embodiment of the present application, wherein arrows indicate the direction of air flow;

FIG5 is a schematic diagram of the structure of the first low-pressure chamber in another embodiment of the present application, wherein arrows indicate the direction of air flow;

FIG6 is a schematic diagram of the structure of the first low-pressure chamber in another embodiment of the present application, wherein arrows indicate the direction of air flow;

FIG7 is a schematic diagram of the structure of the first low-pressure chamber in another embodiment of the present application, wherein arrows indicate the direction of air flow;

FIG8 is a schematic diagram of the structure of the first low-pressure chamber in another embodiment of the present application, wherein arrows indicate the direction of air flow;

FIG9 is a schematic diagram of the structure of a second low-pressure chamber in one embodiment of the present application;

FIG10 is a schematic diagram of the structure of the second low-pressure chamber in another embodiment of the present application, wherein arrows indicate the direction of air flow;

FIG11 is a schematic structural diagram of a second low-pressure chamber in yet another embodiment of the present application;

FIG12 is a schematic diagram of the structure of the second low-pressure chamber in another embodiment of the present application;

FIG13 is a schematic diagram of the structure of the second low-pressure chamber in another embodiment of the present application;

FIG14 is a schematic diagram of the structure of the second low-pressure chamber in another embodiment of the present application;

FIG15 is a schematic diagram of the structure of the second low-pressure chamber in another embodiment of the present application;

FIG16 is a cross-sectional view of the air duct body in FIG15 ;

FIG17 is a cross-sectional view of an air duct assembly according to an embodiment of the present application;

FIG18 is a partial cross-sectional view of an air duct assembly according to another embodiment of the present application;

FIG19 is a schematic diagram of the assembly of a ventilator according to an embodiment of the present application;

FIG20 is a schematic diagram of the structure of a ventilator according to an embodiment of the present application, wherein the cover is not shown;

FIG. 21 is a structural explosion view of a ventilator according to an embodiment of the present application.

in:

1 air duct body; 11 first low-pressure chamber; 111 rectification area; 112 first arc-shaped area; 113 first baffle rib; 114 second baffle rib; 115 baffle rib; 116 silencer chamber; 117 silencer; 118 air inlet; 12 second low-pressure chamber; 121 second arc-shaped area; 122 third arc-shaped area; 13 third low-pressure chamber; 14 high-pressure chamber; 15 first baffle; 16 second baffle; 17 first vent group; 171 first guide protrusion; 172 first guide transition surface; 173 windward side; 18 second vent group; 181 second guide protrusion; 182 second guide transition surface; 19 baffle rib; 191 flow gap;

2 Blower;

3 fan buffer seat; 31 drainage rib position;

4 filling block; 41 throttle hole;

5 laminar parts;

6 laminar flow tubes;

7 base; 71 air duct bottom cover;

8 cover body; 81 matching piece; 82 air duct upper cover;

9Humidification tank assembly.

Detailed ways

In order to more clearly illustrate the overall concept of the present application, a detailed description is given below in an illustrative manner in conjunction with the accompanying drawings.

In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

In addition, in the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "top", "bottom", "inside", "outside", "circumferential", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

In the present application, unless otherwise clearly specified and limited, the first feature "above" or "below" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "implementation method", "example", "one embodiment", "example" or "specific example" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

As shown in Figures 1 to 21, a ventilator air duct assembly includes an air duct body 1 and a blower 2, the air duct body 1 is provided with a low-pressure chamber and a high-pressure chamber 14, the air duct body 1 is also provided with an air inlet 118 connected to the low-pressure chamber and an air outlet connected to the high-pressure chamber 14, the air inlet of the blower 2 is connected to the low-pressure chamber, and the air outlet of the blower 2 is connected to the high-pressure chamber 14; the low-pressure chamber includes a first low-pressure chamber 11, a second low-pressure chamber 12 and a third low-pressure chamber 13 connected in sequence, the first low-pressure chamber 11 is connected to the air inlet 118, and the third low-pressure chamber 13 is connected to the air inlet of the blower 2; the air duct body 1 is provided with a first partition 15 for isolating the first low-pressure chamber 11 and the second low-pressure chamber 12, and a second partition 16 for isolating the second low-pressure chamber 12 and the third low-pressure chamber 13, the first partition 15 is provided with a first vent group 17, and the second partition 16 is provided with a second vent group 18.

The present application does not make any specific limitation on the formation method of the first low-pressure chamber 11, the second low-pressure chamber 12 and the third low-pressure chamber 13. The air duct main body 1 can be structurally designed to form the first low-pressure chamber 11, the second low-pressure chamber 12 and the third low-pressure chamber 13. Alternatively, as shown in FIG. 21, a matching piece 81 of a certain shape can be provided to cooperate with the air duct main body 1 to form at least one of the first low-pressure chamber 11, the second low-pressure chamber 12 and the third low-pressure chamber 13. No specific limitation is made here.

It should be noted that the blower 2 is a turbine blower, which is roughly circular in shape, and the shape of the air duct main body 1 is adapted to the shape of the blower, and is also approximately circular in shape, thereby improving the adaptability of the assembly of the blower 2 and the air duct main body 1, as well as the compactness of the overall structure of the ventilator, which helps to achieve miniaturization.

Preferably, as shown in Fig. 3, the first partition 15 is arranged transversely to separate the low-pressure chamber into two layers, the first low-pressure chamber 11 and the third low-pressure chamber 13 are located in the upper layer, and the second low-pressure chamber 12 is located in the lower layer, and the second partition 16 is located in the upper layer and arranged longitudinally to separate the first low-pressure chamber 11 and the third low-pressure chamber 13 in the upper layer from each other. Thus, when the airflow flows in the low-pressure chamber, it first flows from the first low-pressure chamber 11 in the upper layer to the second low-pressure chamber 12 in the lower layer, and then flows from the second low-pressure chamber 12 in the lower layer to the third low-pressure chamber 13 in the upper layer.

Preferably, as shown in FIG. 2 and FIG. 3 , the first low-pressure chamber 11 surrounds the outer circumference of a partial area of the third low-pressure chamber 13 .

The double-layer structure of the air duct greatly increases the flow path of the air flow in the low-pressure cavity without changing the volume of the original air duct main body 1, so that the air flow continuously shuttles up and down in the two layers of low-pressure cavity, which plays a role in dispersing the air flow and reducing the impact force of the air flow, thereby reducing the noise generated by the air flow. In addition, the tortuous path also extends the path for noise transmission, so that the noise is consumed in the process of transmission.

The present application divides the low-pressure chamber in the air duct body 1 into the first low-pressure chamber 11, the second low-pressure chamber 12 and the third low-pressure chamber 13 which are connected in sequence through the first partition 15 and the second partition 16. After the external airflow enters the air duct body 1 from the air inlet, it flows through the first low-pressure chamber 11, the second low-pressure chamber 12 and the third low-pressure chamber 13 in sequence to enter the high-pressure chamber 14 for pressurization and flows out, which greatly lengthens the air path length in the extremely limited space of the air duct body 1, and the setting of the first vent group 17 and the second vent group 18 achieves the effect of reducing noise and increasing the difficulty of sound wave transmission. When the airflow flows between the low-pressure chambers, there are multiple air intakes and exhausts, and the air path is tortuous, which lengthens the path of sound transmission, greatly increases the difficulty of sound transmission from the air duct body 1, and the sound will be significantly reduced or eliminated when making a large angle turn, which has a good noise reduction and silencing effect.

Since the airflow turns multiple times in the air duct body 1 and needs to pass through the first vent group 17 and the second vent group 18 when flowing between the low-pressure chambers, the vent groups divert the airflow, so that the airflow flows through each vent group more dispersedly and evenly, avoiding the whistling sound caused by the convergence of a large amount of airflow and reducing the flow rate of the airflow to a certain extent, thereby further reducing the noise generated during the flow of the airflow.

As a preferred implementation of the present application, as shown in FIG. 4 , the first low-pressure chamber 11 includes a rectifying area 111 and a first arc-shaped area 112 .

Furthermore, as shown in Figure 4, the width of the rectification area 111 is greater than the width of the first arc-shaped area 112, so that the airflow entering from the air inlet 118 can be briefly gathered and rectified in the rectification area 111, and the width of the rectification area 111 is relatively large, with a sufficiently large air intake area and smaller resistance. Under the condition that the performance of the blower 2 is the same, a higher flow rate can be provided, and at the same time, the air path resistance is lower. The blower 2 consumes less electric energy to provide the same flow rate and pressure, and the rotation speed is lower. At the same time, the rotation speed of the blower 2 will be relatively low, and the noise generated will be significantly reduced, which can achieve the effect of noise reduction.

Preferably, the first low-pressure chamber 11 is provided with a first baffle rib 113 for separating the rectifying area 111 and the first arc-shaped area 112 .

Preferably, as shown in FIG. 4 , the first arc-shaped area 112 surrounds the outer circumference of the blower 2 .

The shapes of the air duct main body 1 and the blower 2 are adapted to each other and are both circular to achieve a miniaturized design of the air duct main body. At the same time, the first low-pressure chamber 11 has a first arc-shaped area 112, thereby extending the length of the first low-pressure chamber 11 within the limited volume of the air duct main body 1, so that the airflow is buffered during the flow in the first low-pressure chamber 11, reducing the noise generated by the airflow, and making the airflow in the first low-pressure chamber 11 evenly dispersed through the first vent group 17 into the second low-pressure chamber 12, thereby achieving diversion and noise reduction.

Further, as shown in FIG5 , a first baffle rib 113 is provided between the rectifying area 111 and the first arc-shaped area 112, thereby forming an airflow corner between the rectifying area 111 and the first arc-shaped area 112. After entering the first low-pressure chamber 11, the airflow is blocked by the first baffle rib 113, turns around the first baffle rib 113 at a large angle, enters the first arc-shaped area 112, and flows along the extension direction of the first arc-shaped area 112. The tortuosity of the noise transmission path is further increased, the noise transmission path is lengthened, and at the same time, the airflow turns at a large angle, which can reduce the flow velocity of the airflow and reduce the noise generated by the airflow.

Preferably, the turning angle of the airflow at the corner of the airflow is greater than 90°, so as to lengthen the path of noise transmission and greatly increase the difficulty of sound transmission out of the air duct, while not causing excessive impact on the flow efficiency of the airflow, thereby ensuring the air intake efficiency.

In one embodiment, as shown in FIG. 6 , a second baffle rib 114 is further disposed inside the rectifying area 111 .

As shown in FIG6 , the second baffle rib 114 is located in the rectifying area 111, blocking the air inlet 118, so that the airflow entering from the air inlet 118 is blocked by the second baffle rib 114 and turns, and the turning angle is about 90°. Then the airflow flows along the extension direction of the second baffle rib 114 until it bypasses the second baffle rib 114 from one side of the second baffle rib 114, completing a turn of about 180°, thereby further lengthening the flow path of the airflow and reducing the transmission of noise.

In another embodiment, as shown in FIG. 7 , the rectifying area 111 is further provided with a retaining rib 115 , the retaining rib 115 cooperates with the inner wall of the rectifying area 111 to form a silencer cavity 116 , and the retaining rib 115 is provided with an opening communicating with the silencer cavity 116 .

When the airflow flows in the rectification area 111, the sound generated will enter the silencer chamber 116 through the opening, and the noise entering the silencer chamber 116 will be greatly weakened or eliminated, which can help absorb the noise at the air inlet 118 and in the first low-pressure chamber 11, thereby achieving the effect of silencing and reducing noise.

Preferably, as shown in FIG. 4 to FIG. 8 , the first ventilation hole group 17 includes a plurality of first ventilation holes, and the axis of the air inlet 118 is perpendicular to the axis of the first ventilation holes.

Specifically, as shown in Figure 4, the air inlet 118 is facing horizontally, and the first low-pressure chamber 11 also extends laterally, so that the flow direction of the airflow in the first low-pressure chamber 11 is horizontal, but the first vent group 17 is facing vertically, connecting the first low-pressure chamber 11 with the second low-pressure chamber 12 in the lower layer. Therefore, the airflow in the first low-pressure chamber 11 will turn again when entering the second low-pressure chamber 12.

Preferably, as shown in Figure 3, the second vent group 18 includes a plurality of second vents, and the second vents are also oriented in the vertical direction. Therefore, when the airflow flows from the first low-pressure chamber 11 to the second low-pressure chamber 12, it needs to make a turn of about 90°, pass through the first vent upward, and make another turn of about 90° from the vertical direction in the second low-pressure chamber 12 to convert to lateral flow. Then, when the airflow flows from the second low-pressure chamber 12 to the third low-pressure chamber 13, it turns from the lateral direction to the vertical direction again and passes through the second vent upward.

Therefore, the airflow makes three turns of about 90 degrees or more than 90 degrees in the low-pressure chamber, and the noise also needs to go through three turns of about 90 degrees or more than 90 degrees to be transmitted, thereby greatly lengthening the transmission path of the sound and greatly increasing the difficulty of noise transmitting out of the air duct main body 1.

Preferably, as shown in FIG8 , the rectifying area 111 is also filled with a silencer 117, which may be made of sound-absorbing cotton or a material having certain sound-absorbing and sound-silencing properties. The silencer 117 is preferably a honeycomb structure, and the honeycomb holes are regular circles, squares, triangles, or other polygons, and the honeycomb holes have a certain tapered angle, which can help absorb noise. After the noise enters the honeycomb holes, it is not easy to be reflected or refracted and transmitted from the honeycomb holes.

As a preferred embodiment of the present application, as shown in Figures 9 and 10, the second low-pressure chamber 12 includes a second arc-shaped area 121 and a third arc-shaped area 122. A separating rib assembly is also provided in the second low-pressure chamber 12 for separating the second arc-shaped area 121 and the third arc-shaped area 122. The first ventilation hole group 17 is arranged in the second arc-shaped area 121, and the second ventilation hole group 18 is arranged in the third arc-shaped area 122.

Preferably, as shown in Figure 9, the multiple first ventilation holes of the first ventilation hole group 17 and the multiple second ventilation holes of the second ventilation hole group 18 are spaced apart along the extension direction of the second low-pressure chamber 12, and the number of the first ventilation hole group 17 can be the same as that of the second ventilation hole group 18, or the number can be different.

The separation rib assembly separates the second low-pressure chamber 12 into two arc-shaped areas, and the two groups of vents are respectively located in the two arc-shaped areas. While conforming to the overall shape and structure of the air duct assembly, the degree of tortuosity of the airflow flow path in the second low-pressure chamber 12 is further increased, and the airflow entering the second low-pressure chamber 12 is buffered again. After the airflow enters the second low-pressure chamber 12 from the first vent group 17, it will not directly enter the third low-pressure chamber 13 through the second vent group 18, but will flow horizontally under the obstruction of the separation rib assembly until it bypasses the separation rib assembly and can enter the third arc-shaped area 122. This further extends the length of the air duct and increases the difficulty of noise transmission.

Specifically, as shown in Figures 4, 10, and 16, the first low-pressure chamber 11 includes a first arc-shaped area 112, the first arc-shaped area 112 is located on the upper side of the second arc-shaped area 121, and the third arc-shaped area 122 is located on the inner side of the second arc-shaped area 121; the third low-pressure area 13 is located on the upper side of the third arc-shaped area 122. The projection of the second low-pressure chamber 12 in the up and down directions covers the first low-pressure chamber 11 and the third low-pressure chamber 13, and the internal space of the air duct body 1 is reasonably utilized to make the arrangement of the three low-pressure chambers more compact.

In a preferred embodiment, as shown in Figures 10 to 15, the dividing rib assembly includes a plurality of dividing ribs 19 arranged at intervals, with a flow gap 191 between two adjacent dividing ribs 19, and one of the first vent group 17 and the second vent group 18 is arranged corresponding to the dividing rib 19, and the other is arranged corresponding to the flow gap 191.

After the airflow enters the second low-pressure chamber 12 from the first vent group 17, it will not directly enter the third low-pressure chamber 13 through the second vent group 18, but will flow horizontally under the obstruction of the separation rib 19 until it bypasses the separation rib 19 and enters the third arc-shaped area 122, thereby further extending the airflow path and the noise transmission path, and preventing the airflow in the second arc-shaped area 121 from directly entering the third arc-shaped area 122. This further extends the length of the air duct and increases the difficulty of noise transmission.

It should be noted that the second low-pressure chamber 12 of the present application extends along an arc shape, but the present application does not specifically limit the shape and extension direction of the separation rib 19, which can be one of the following embodiments:

Embodiment 1: In this embodiment, as shown in FIGS. 10 and 11 , the partition ribs 19 are of a straight structure, and the partition ribs 19 are arranged at intervals along the extension direction of the second low-pressure chamber 12.

Embodiment 2: In this embodiment, as shown in FIG12 , the partition rib 19 is a curved structure, and the partition rib 19 is bent toward the third arc-shaped area 122 to form a guide arc surface protruding toward the second arc-shaped area 121. The airflow entering from the first low-pressure chamber 11 is blocked by the partition rib 19, and flows to both sides of the partition rib 19 under the guidance of the guide arc surface, and enters the third arc-shaped area 122 from the flow gap 191.

Embodiment 3: In this embodiment, as shown in FIG14 , the separation rib 19 is a curved structure, and the separation rib 19 is bent toward the second arc-shaped area 121 to form a guide arc surface convex toward the third arc-shaped area 122. The airflow entering from the first low-pressure chamber 11 is blocked by the separation rib 19, and the separation rib 19 forms a gathering effect on the airflow, which briefly converges the airflow, plays a rectifying effect, and improves the stability of the airflow.

Embodiment 4: In this embodiment, as shown in FIG. 15 , the dividing rib 19 is curved in a wave shape. When the airflow enters the second arc-shaped area 122, the groove of the dividing rib 19 faces the first vent group 17, which converges the airflow. When the airflow in the groove is large, the airflow flows through the protruding guide arc surface to the third arc-shaped area 122.

Further, as shown in Figures 15 and 16, a first guide protrusion 171 is provided at the first vent group 17, and the first guide protrusion 171 has a first guide transition surface 172 on the side facing the first vent group 17; and/or, a second guide protrusion 181 is provided at the second vent group 18, and the second guide protrusion 181 has a second guide transition surface 182 on the side facing the second vent group 18.

The first guide transition surface 172 and/or the second guide transition surface 182 cooperate with the separation rib assembly to control and guide the flow direction of the airflow in a more detailed manner, thereby reducing the noise transmission and increasing the stability of the internal airflow, reducing the fluctuation during gas flow, and making the airflow flow smoother. At the same time, the guide transition surface can reduce the flow resistance and control the direction of the airflow, affecting the path of sound propagation, so that the sound propagates in a direction that is conducive to silencer, thereby helping to reduce noise.

Preferably, as shown in Fig. 16, the first vent group 17 is provided with a first guide protrusion 171, and the second vent group 18 is provided with a second guide protrusion 181, so as to simultaneously guide the airflow passing through the first vent group 17 and the second vent group 18. Of course, the guide protrusion may also be provided in any one of the first vent group 17 and the second vent group 18, which is not specifically limited here.

In addition, as shown in Fig. 16, the first flow guiding protrusion 171 can be disposed in the first low-pressure chamber 11, or in the second low-pressure chamber 12, or both the first low-pressure chamber 11 and the second low-pressure chamber 12 are provided with the first flow guiding protrusion 171. Similarly, the second flow guiding protrusion 181 can be disposed in the second low-pressure chamber 12, or in the third low-pressure chamber 13, or both the second low-pressure chamber 12 and the third low-pressure chamber 13 are provided with the second flow guiding protrusion 181.

Preferably, as shown in FIG. 15 , the first guide protrusion 171 and the second guide protrusion 181 have a windward side 173 , and the first guide protrusion 171 and the second guide protrusion 181 can rotate to adjust the direction of the windward side 173 .

The flow-guiding transition surface may be a circular arc surface as shown in FIG. 16 , or may be an inclined surface or other irregular curved surface, etc., which is not specifically limited here.

It should be noted that the present application does not specifically limit the shape and size of each first ventilation hole of the first ventilation hole group 17 and each second ventilation hole of the second ventilation hole group 18. For example, the shape of the first ventilation hole and the second ventilation hole can be a circle as shown in FIG. 9, or a triangle, or other irregular polygons. For example, as shown in FIG. 11, the first ventilation hole and the second ventilation hole can extend laterally to be a long strip.

Preferably, the sizes of the first vent holes of the first vent hole group 17 and the sizes of the second vent holes of the second vent hole group 18 are different. For example, taking the first vent hole group 17 as an example, the sizes of the first vent holes can be gradually reduced along the extension direction of the first low-pressure chamber 11, that is, the first vent hole closest to the air inlet 118 has the largest diameter, and the first vent hole farthest from the air inlet has the smallest diameter. For another example, as shown in FIG. 13 , the first vent holes with large diameters and the first vent holes with small diameters can be arranged at intervals.

Through the different number and size arrangement combinations of the first air hole group 17 and the second air hole group 18, different contours and cross-sectional shapes, the airflow is guided to flow through the first air hole group 17 and the second air hole group 18 from different angles, and the direction of the airflow is more finely controlled and guided, thereby increasing the stability of the airflow, reducing the fluctuation of the gas flow, making the airflow flow smoother and with less flow resistance. The direction of the airflow can be controlled, affecting the path of sound propagation, so that the sound is propagated in a direction that is conducive to silencing, which helps to reduce noise.

In a preferred embodiment of the present application, as shown in Figures 17 and 21, the ventilator air duct assembly also includes a fan buffer seat 3 and a filling block 4, the blower 2 is fixed to the fan buffer seat 3, the outer periphery of the fan buffer seat 3 is provided with drainage ribs 31, the filling block 4 is arranged at the air inlet of the blower 2, the filling block 4 is a structure made of elastic material, and the filling block 4 is provided with a plurality of throttling holes 41.

The fan buffer seat 3 can reduce the vibration of the blower 2 through the vibration transmission between solids, and conduct it to the internal components of the ventilator. At the same time, it helps to reduce the shock and noise of the high-pressure chamber 14, and reduce the noise caused by vibration. In addition, reducing vibration also helps the stable flow of airflow and improves the stability and accuracy of the readings of the ventilator sensor. At the same time, the drainage ribs 31 on the periphery of the fan buffer seat 3 can also guide the airflow, so that the airflow enters the inside of the blower 2 along a preset path. A filling block 4 is provided at the air inlet of the blower 2. On the one hand, the filling block 4 can further absorb and buffer the vibration of the blower 2 and reduce vibration noise. On the other hand, the filling block 4 is provided with a throttle hole 41, so that the airflow is diverted again before entering the blower 2, so that the airflow enters the inside of the blower 2 evenly and dispersedly, avoiding the high-speed rotating blades of the blower 2 and the high-speed airflow with a large flow rate to collide and make noise.

Preferably, as shown in Figures 1, 2, 17, 18 and 20, the ventilator air duct assembly also includes a laminar flow tube 6 and a laminar flow component 5 connected to the laminar flow tube 6, the laminar flow component 5 is connected to the air outlet of the high-pressure chamber 14, and a plurality of diversion ports are provided on the windward surface of the laminar flow component 5.

Specifically, the laminar flow tube 6 is made of a flexible material and is used to connect the air duct cover 82 and the laminar flow member 5; the air outlet end of the laminar flow member 5 is provided with a humidification tank air inlet sealing ring, which is made of a flexible material and is used to connect the laminar flow member and the humidification tank assembly 9. The vibration of the blower 2 may be transmitted to the base assembly through the air duct cover 82 and the air duct body 1. The flexible laminar flow tube 6 and the humidification tank air inlet sealing ring can reduce the vibration of the air duct cover 82 through the vibration transmission between solids and transmit it to the laminar flow member 5, which is helpful for the shock absorption and noise reduction of the high-pressure chamber 14. At the same time, reducing the vibration also helps to stabilize the flow and improve the stability and accuracy of the sensor readings matched with the laminar flow member 5.

Preferably, the cross-sectional shape of the laminar flow element 5 is circular or approximately regular polygonal, and its cross-sectional area is preferably 100-300 mm ² , and the laminar flow element 5 has a straight section, and the length of the straight section is preferably greater than 20 mm, which helps to stabilize the flow and improve the stability and accuracy of the differential pressure value read by the laminar flow differential pressure detection port. At the same time, a certain length of the straight section (preferably greater than 30 mm) helps to stabilize the flow and reduce noise, especially to eliminate low-frequency noise below 5000 Hz.

Preferably, as shown in Figure 21, the air duct assembly also includes an air duct upper cover 82 and an air duct bottom cover 71. After the internal components of the air duct assembly are assembled, the upper and lower sides of the air duct main body 1 are closed by the air duct upper cover 82 and the air duct bottom cover 71, so that the air duct assembly becomes a whole, and then can be installed together to the ventilator body.

As shown in Figures 20 and 21, the present application also discloses a portable ventilator, including a base 7, a cover body 8, and a humidification tank assembly 9. The ventilator also includes the above-mentioned ventilator air duct assembly. The base 7 and the cover body 8 cooperate to form an installation cavity. The air duct assembly is arranged in the installation cavity. The outlet of the high-pressure cavity 14 is connected to the humidification tank assembly 9.

The gas flow path of the ventilator of the present application is as follows: air enters the first low-pressure chamber 11 from the outside through the filter, and flows along the extension direction of the first low-pressure chamber 11. During the flow process, it will flow into the second low-pressure chamber 12 through the first vent group 17 provided on the first partition 15 between the first low-pressure chamber 11 and the second low-pressure chamber 12, flow in the second low-pressure chamber 12, and then flow into the third low-pressure chamber 13 through the second vent group 18 provided on the second partition 16 between the second low-pressure chamber 12 and the third low-pressure chamber 13. In the third low-pressure chamber 13, it flows upward along the side walls of the air duct main body 1 and the air duct upper cover 82 to enter the air inlet of the blower 2, and then flows out from the air outlet of the blower 2 to enter the high-pressure chamber 14, and then flows through the laminar flow tube 6 to enter the laminar flow component 5, and then the gas passes through the laminar flow component 5 and enters the humidification tank assembly 9, and then the humidified gas passes through the breathing circuit, and then to the user end for the user to breathe.

Anything not described in this application can be achieved by adopting or drawing on existing technologies.

The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims (13)

1. A ventilator air duct assembly comprises an air duct body and a blower, characterized in that:

   The air duct body is provided with a low-pressure chamber and a high-pressure chamber, and the air duct body is also provided with an air inlet connected to the low-pressure chamber and an air outlet connected to the high-pressure chamber, the air inlet of the blower is connected to the low-pressure chamber, and the air outlet of the blower is connected to the high-pressure chamber;

   The low-pressure chamber comprises a first low-pressure chamber, a second low-pressure chamber and a third low-pressure chamber which are connected in sequence, the first low-pressure chamber is connected to the air inlet, and the third low-pressure chamber is connected to the air inlet of the blower;

   The air duct body is provided with a first partition plate isolating the first low-pressure chamber and the second low-pressure chamber, and a second partition plate isolating the second low-pressure chamber and the third low-pressure chamber. The first partition plate is provided with a first ventilation hole group, and the second partition plate is provided with a second ventilation hole group.
2. The ventilator air duct assembly according to claim 1 is characterized in that:

   The first low-pressure chamber includes a rectifying area and a first arc-shaped area, and the first low-pressure chamber is provided with a first baffle rib separating the rectifying area and the first arc-shaped area.
3. The ventilator air duct assembly according to claim 2 is characterized in that:

   A second flow-blocking rib is also arranged inside the flow-rectifying area.
4. The ventilator air duct assembly according to claim 2 is characterized in that:

   The rectification area is further provided with baffle ribs, and the baffle ribs cooperate with the inner wall of the rectification area to form a silencer cavity, and the baffle ribs are provided with openings communicating with the silencer cavity.
5. The ventilator air duct assembly according to any one of claims 2 to 4, characterized in that:

   The first ventilation hole group includes a plurality of first ventilation holes, and the axis of the air inlet is perpendicular to the axis of the first ventilation holes.
6. The ventilator air duct assembly according to claim 1 is characterized in that:

   The second low-pressure chamber includes a second arc-shaped area and a third arc-shaped area. A separating rib assembly is also provided in the second low-pressure chamber to separate the second arc-shaped area and the third arc-shaped area. The first ventilation hole group is arranged in the second arc-shaped area, and the second ventilation hole group is arranged in the third arc-shaped area.
7. The ventilator air duct assembly according to claim 6 is characterized in that:

   The first low-pressure chamber includes a first arc-shaped area, the first arc-shaped area is located on the upper side of the second arc-shaped area, the third arc-shaped area is located on the inner side of the second arc-shaped area; the third low-pressure area is located on the upper side of the third arc-shaped area.
8. The ventilator air duct assembly according to claim 7 is characterized in that:

   The dividing rib assembly includes a plurality of dividing ribs arranged at intervals, with a flow gap between two adjacent dividing ribs, one of the first ventilation hole group and the second ventilation hole group is arranged corresponding to the dividing rib, and the other of the two is arranged corresponding to the flow gap.
9. The ventilator air duct assembly according to claim 7, characterized in that:

   A first guide protrusion is provided at the first ventilation hole group, and the first guide protrusion has a first guide transition surface on the side facing the first ventilation hole group; and/or a second guide protrusion is provided at the second ventilation hole group, and the second guide protrusion has a second guide transition surface on the side facing the second ventilation hole group.
10. The ventilator air duct assembly according to claim 1, characterized in that:

    The first low-pressure chamber surrounds the outer circumference of a partial area of the third low-pressure chamber.
11. The ventilator air duct assembly according to claim 1, characterized in that:

    The ventilator air duct assembly also includes a fan buffer seat and a filling block. The blower is fixed to the fan buffer seat. The outer periphery of the fan buffer seat is provided with drainage ribs. The filling block is arranged at the air inlet of the blower. The filling block is a structure made of elastic material and has multiple throttling holes.
12. The ventilator air duct assembly according to claim 1, characterized in that:

    The ventilator air duct assembly also includes a laminar flow tube and a laminar flow component connected to the laminar flow tube, the laminar flow component is connected to the air outlet of the high-pressure chamber, and a plurality of diversion ports are provided on the windward surface of the laminar flow component.
13. A portable ventilator comprises a base, a cover, and a humidification tank assembly, characterized in that:

    The ventilator also includes a ventilator air duct assembly as described in any one of claims 1-12, the base and the cover body cooperate to form an installation cavity, the air duct assembly is arranged in the installation cavity, and the outlet of the high-pressure cavity is connected to the humidification tank assembly.

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