Ventilation therapy equipment and its noise reduction device

Abstract

This invention relates to the field of ventilation therapy equipment and discloses a ventilation therapy equipment and its noise reduction device. The noise reduction device includes a housing (1) with an airflow channel inside the housing (1) for transmitting airflow within the housing (1). A sound-absorbing component is disposed outside the airflow channel, the sound-absorbing component comprising a sound-absorbing material, and the sound-absorbing component is configured to be mutually isolated from the airflow within the housing (1). This noise reduction device allows noise waves inside the housing to have their sound energy absorbed by the sound-absorbing material of the sound-absorbing component when propagating through the sound-absorbing component outside the airflow channel, thereby effectively reducing the generation and transmission of noise. Since the sound-absorbing component is configured to be mutually isolated from the airflow within the housing, it can largely prevent particles that may exist in the sound-absorbing component from contacting the airflow within the housing, thereby reducing the risk of these particles being supplied to the patient with the airflow and ensuring the patient's ventilation safety.

Description

Technical Field

[0001] This invention relates to ventilation therapy equipment, and more specifically to a noise reduction device. Furthermore, this invention also relates to a ventilation therapy equipment incorporating the noise reduction device. Background Technology

[0002] In modern clinical medicine, ventilation therapy devices are widely used in anesthesia respiratory management, respiratory support therapy, and emergency resuscitation. These devices typically use a fan to compress air, increase gas pressure, and deliver breathable gas to the patient's airway. Because some patients need to keep the ventilation therapy device close at hand for extended periods, the treatment process must be as quiet and comfortable as possible. However, the fan operation generates significant noise as the gas flows within the device, which can substantially disrupt the patient's sleep.

[0003] To address this, ventilation therapy equipment typically incorporates a noise reduction box, housing the fan to minimize noise transmission to the external environment during operation. The noise reduction box can be configured in various ways to achieve its noise reduction effect, such as by placing sound-absorbing cotton in the airflow channel or altering the airflow path. However, after prolonged use or repeated sterilization, the porous nature of the sound-absorbing cotton can easily lead to the presence of fine particulate matter. These particles can be supplied to the patient with the airflow during operation of the ventilation therapy equipment, potentially causing adverse health effects. Summary of the Invention

[0004] The purpose of this invention is to overcome the problem that noise reduction boxes in existing ventilation therapy devices cannot simultaneously meet noise reduction needs and patient respiratory safety, and to provide a noise reduction device that not only facilitates achieving relatively good noise reduction effects, but also effectively prevents particulate matter from being supplied to the patient with the airflow, thus ensuring airflow quality and the patient's physical and mental health.

[0005] To achieve the above objectives, the present invention provides a noise reduction device, including a housing, an airflow channel inside the housing for transmitting airflow within the housing, and a sound-absorbing component outside the airflow channel, the sound-absorbing component comprising a sound-absorbing material, the sound-absorbing component being configured to be mutually isolated from the airflow within the housing.

[0006] Preferably, each surface of the sound-absorbing element is configured to contact the corresponding adjacent surface within the housing to isolate it from the airflow within the housing.

[0007] Preferably, the sound-absorbing element covers the outside of the airflow channel; one side wall of the sound-absorbing element contacts the outer side wall of the airflow channel, and the other side wall contacts the inner side wall of the housing or the corresponding adjacent surface inside the housing, so as to isolate the airflow inside the housing.

[0008] Preferably, a support structure is formed inside the housing corresponding to the end face of the sound-absorbing element, and the end face of the sound-absorbing element is in contact with the surface of the support structure, so that the end face of the sound-absorbing element is isolated from the airflow inside the housing.

[0009] Preferably, a plurality of partitioned chambers are formed within the housing; wherein, at least one of the partitioned chambers is provided with an airflow channel for transmitting airflow, and / or, an airflow channel for connecting the two partitioned chambers is provided between the two partitioned chambers.

[0010] Preferably, the plurality of partitioned chambers include an air intake guide chamber, a fan installation chamber communicating with the air intake guide chamber, and a fan inlet chamber communicating with the fan installation chamber; airflow from the external space of the housing passes sequentially through the air intake guide chamber, the fan installation chamber, and the fan inlet chamber into the fan installed in the fan installation chamber.

[0011] Preferably, the air intake guide chamber is provided with the airflow channel, the airflow channel is configured as a first guide pipe, and the air intake guide chamber is connected to the external space of the housing through the first guide pipe;

[0012] The first flow guide pipe is covered by the sound-absorbing component, which is configured as a first covering. The two side walls of the first covering are respectively in contact with the outer side wall of the first flow guide pipe and the inner side wall of the air intake flow guide chamber, so that the two side walls of the first covering are isolated from the airflow in the air intake flow guide chamber.

[0013] Preferably, a first supporting boss is formed on the inner side wall of the air intake guide chamber or the outer side wall of the first guide pipe corresponding to the end face of the first covering, and the end face of the first covering is in contact with the surface of the first supporting boss, so that the end face of the first covering is isolated from the airflow in the air intake guide chamber.

[0014] Preferably, the air intake guide chamber has a first region located above the first guide pipe and a second region located below the first guide pipe; the first guide pipe includes a first outlet end and a second outlet end;

[0015] The airflow in the first guide tube enters the first region through the first outlet end; the first region forms a dead cavity that restricts the flow of air.

[0016] The airflow in the first guide pipe enters the second region through the second outlet end, and the second region is connected to the fan installation chamber.

[0017] Preferably, the first guide tube includes a tube assembly body and an air inlet end communicating with the tube assembly body, wherein one or more first air inlet channels extending along a first direction are formed within the tube assembly body, wherein the cross-sectional area of ​​the first air inlet channel is smaller than the cross-sectional area of ​​the air inlet end; the first cover covers at least the outer periphery of the tube assembly body; the air inlet end extends outward from the tube assembly body along a second direction at an angle relative to the first direction, and when the tube assembly body is disposed in the air inlet guide chamber, the air inlet end communicates with the external space of the housing.

[0018] Preferably, the housing includes a lower housing and an upper housing that is fastened to the lower housing;

[0019] The housing is divided into a first cavity and a second cavity in a horizontal direction, wherein the second cavity is configured as the air intake guide chamber, and the first cavity is divided into the fan air intake chamber near the upper housing and the fan mounting chamber located below the fan air intake chamber.

[0020] Preferably, the housing is provided with a horizontal partition, and a second vent and a third vent are respectively opened on the horizontal partition;

[0021] The second vent is used to connect the fan mounting chamber and the fan inlet chamber; the fan installed in the fan mounting chamber has an air inlet, and the air inlet is sealed and connected to the fan inlet chamber through the third vent.

[0022] Preferably, the horizontal partition has a guide protrusion protruding towards the fan inlet chamber corresponding to the third vent. The peripheral wall of the guide protrusion has a plurality of guide ports communicating with the third vent. The airflow in the fan inlet chamber flows into the fan inlet installed in the fan mounting chamber through the guide ports and the third vent in sequence.

[0023] Preferably, the inner side of the top wall of the guide protrusion is formed with a guide cone that gradually tapers toward the fan mounting chamber.

[0024] Preferably, the fan mounting chamber is provided with a fan housing for mounting the fan, the fan housing is provided with an inlet corresponding to the air inlet of the fan, and an annular protrusion is formed around the inlet of the fan housing that fits against the bottom surface of the horizontal partition, so that the air inlet of the fan installed in the fan housing is sealed and connected to the third vent through the annular protrusion.

[0025] Preferably, the fan inlet chamber has a plurality of arc-shaped guide ribs that extend toward the horizontal partition and are spaced apart from each other in the circumferential direction, forming a plurality of arc-shaped guide ribs on the inner side of the upper housing, and the plurality of guide ribs guide the airflow in the fan inlet chamber toward the air inlet.

[0026] Preferably, the airflow channel connects the fan mounting chamber and the fan inlet chamber. The airflow channel is configured as a second guide pipe, which includes one or more second inlet channels. The sound-absorbing component covers the outside of the second guide pipe. The sound-absorbing component is configured as a second covering. The two side walls of the second covering are respectively in contact with the outer side wall of the second guide pipe and the inner side wall of the fan mounting chamber or fan inlet chamber, so that the two side walls of the second covering are isolated from the airflow in the fan mounting chamber or fan inlet chamber.

[0027] Preferably, a second supporting boss is formed on the inner side wall of the fan mounting chamber and the fan inlet chamber or on the outer side wall of the second guide pipe corresponding to the end face of the second covering. The end face of the second covering is in contact with the surface of the second supporting boss, so that the end face of the second covering is isolated from the airflow in the fan mounting chamber or the fan inlet chamber where it is located.

[0028] Preferably, the housing has an inner housing layer and an outer housing layer, and a sealed cavity is formed between the inner housing layer and the outer housing layer. The sealed cavity forms a vacuum space or is filled with sound-absorbing material.

[0029] A second aspect of the present invention provides a ventilation therapy device having the above-described noise reduction device.

[0030] Through the above technical solution, the noise reduction device of the present invention allows airflow to pass through the airflow channel inside the housing. When noise waves inside the housing propagate through the sound-absorbing component outside the airflow channel, the sound wave energy is absorbed by the sound-absorbing material of the component, thereby effectively reducing noise generation and outward transmission, achieving a relatively good noise reduction effect. Since the sound-absorbing component is designed to be isolated from the airflow inside the housing, it can largely prevent any particles that may exist in the sound-absorbing component from contacting the airflow inside the housing, thereby reducing the risk of these particles being further supplied to the patient with the airflow and ensuring the patient's ventilation safety. Attached Figure Description

[0031] Figure 1 This is a perspective view of a noise reduction device according to a preferred embodiment of the present invention;

[0032] Figure 2 yes Figure 1 A cross-sectional view of the noise reduction device in the middle;

[0033] Figure 3 yes Figure 2 A perspective view of the first flow guide pipe of the noise reduction device, which is covered by a first covering component;

[0034] Figure 4 yes Figure 2 A perspective view of the upper housing of the noise reduction device;

[0035] Figure 5 yes Figure 2 A three-dimensional view of the horizontal partition of the noise reduction device;

[0036] Figure 6 It indicates that the airflow is in Figure 2 A schematic diagram of the flow path within the noise reduction device;

[0037] Figure 7 This is a partially enlarged view of a noise reduction device according to another preferred embodiment of the present invention.

[0038] Explanation of reference numerals in the attached figures

[0039] 1-Shell; 11-Upper shell; 11a-Arc-shaped guide rib; 12-Lower shell; 12a-Air inlet; 12b-Air outlet; 1a-Inner shell; 1b-Outer shell; 1c-Sealed chamber; 2-Horizontal partition; 21-Second vent; 22-Guide protrusion; 23-Fan housing connecting groove; 22a-Guide port; 22b-Guide cone; 24-Third vent; 3-Vertical partition; 31-First vent; 4-Air inlet guide chamber; 41-First area; 42-Second area; 4a-First support boss; 5-Fan mounting chamber; 51-Air inlet; 6-Fan air inlet chamber; 7-First guide pipe fitting; 71-Pipe assembly body; 72-Air inlet end; 73-First outlet end; 74-Second outlet end; 8-First covering; 9-Fan housing; 91-Annular protrusion. Detailed Implementation

[0040] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0041] In this invention, unless otherwise stated, directional terms such as "upper," "lower," "left," and "right" generally refer to the upper, lower, left, and right as shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0042] Reference Figure 1 and Figure 2As shown, a noise reduction device according to a preferred embodiment of the present invention includes a housing 1, which has an airflow channel for transmitting airflow within the housing 1, such as a first guide pipe 7 or a second guide pipe described later, guiding gas flow within the housing 1 or connecting a partitioned chamber within the housing 1 to an adjacent partitioned chamber, thereby enabling, for example, the uniform supply of gas to a fan installed within the housing 1. A sound-absorbing element, comprising sound-absorbing material, is disposed outside the airflow channel and is configured to isolate it from the airflow within the housing 1.

[0043] Therefore, when noise waves inside the housing 1 propagate through the sound-absorbing component outside the airflow channel, the sound-absorbing material of the component absorbs the sound wave energy, effectively reducing noise generation and transmission, achieving a relatively good noise reduction effect. Since the sound-absorbing component is designed to be isolated from the airflow inside the housing 1, it largely prevents particles that may be present in the component from contacting the airflow inside the housing. When used in ventilation therapy equipment such as ventilators, this noise reduction device can reduce the risk of these particles being further supplied to the patient with the airflow, ensuring the patient's ventilation safety.

[0044] The aforementioned sound-absorbing element can be disposed outside the airflow channel in various suitable ways and isolated from the airflow inside the housing 1. In a preferred embodiment of the invention, each surface of the sound-absorbing element is configured to contact the corresponding adjacent surface inside the housing 1 to isolate it from the airflow inside the housing 1. This allows the surface of the sound-absorbing element to be covered by the surface inside the housing 1 adjacent to the sound-absorbing element, preventing airflow from passing over the surface of the sound-absorbing element and preventing any particulate matter that may be present in the sound-absorbing element from being carried by the airflow.

[0045] Specifically, the sound-absorbing component can be wrapped around the outside of the airflow channel, for example, such as... Figure 3 As shown, the first covering 8, which is a sound-absorbing element or part of a sound-absorbing element, can cover the outside of the first guide pipe 7, which serves as an airflow channel. Based on this, one sidewall of the sound-absorbing element contacts the outer sidewall of the airflow channel, and the other sidewall contacts the inner sidewall of the housing 1 or a corresponding adjacent surface within the housing 1, thereby isolating the airflow within the housing 1. Since the surface area of ​​the outer sidewall of the airflow channel is typically much larger than the end face area of ​​the airflow channel, by ensuring that the two sidewalls of the sound-absorbing element covering it contact the outer sidewall of the airflow channel and the inner sidewall of the housing 1 or a corresponding adjacent surface within the housing 1, respectively, it is possible to effectively prevent most of the surface area of ​​the sound-absorbing element (i.e., the sidewall surface area of ​​the sound-absorbing element) from being isolated from the airflow, thus ensuring that the airflow quality of the housing is not affected by particles that may be present in the sound-absorbing element.

[0046] For the end face of the sound-absorbing component, a support structure can be provided inside the housing 1 to correspond to the end face, so that the end face of the sound-absorbing component is in contact with the surface of the support structure, thereby isolating the end face of the sound-absorbing component from the airflow inside the housing 1.

[0047] Typically, the housing 1 may have an air inlet 12a and an air outlet 12b. When used as a ventilation therapy device, the housing 1 may also house a fan that draws air from the external environment through the air inlet 12a, pressurizes it, and supplies it to the patient through the air outlet 12b (usually passing through a humidifier, etc.). For ease of disassembly and maintenance, the housing 1 may include an upper housing 11 and a lower housing 12. The upper housing 11 is snap-fitted to the upper opening of the lower housing 12 and sealed together by bolts or other fasteners. Generally, the housing 1 may be made of materials such as plastic or hard alloy, with plastic being preferred due to its good strength and noise shielding properties.

[0048] In some preferred embodiments, the housing 1 may have multiple partitioned chambers separated by partitions. For example, in the illustrated preferred embodiment, the spaces within the upper housing 11 and the lower housing 12 are separated by horizontal partitions 2 and vertical partitions 3, forming the following partitioned chambers: an air inlet guide chamber 4, a fan mounting chamber 5, and a fan air inlet chamber 6. The air inlet 12a of the housing 1 connects to the air inlet guide chamber 4, and the air outlet 12b connects to the fan outlet. Figure 6 As indicated by the middle arrow, under the action of the fan, the air drawn in through the air inlet 12a can sequentially pass through the air inlet guide chamber 4, the fan mounting chamber 5, and the fan inlet chamber 6, and be drawn in by the fan installed in the fan mounting chamber 5, and then supplied to the outside through the air outlet 12b. As mentioned above, in the noise reduction device of the present invention, the airflow channel for transmitting airflow can be provided in at least one of the partition chambers, and / or, the airflow channel can be configured to connect two adjacent partition chambers to guide the airflow in the corresponding partition chamber or between adjacent partition chambers.

[0049] In the noise reduction device of the preferred embodiment shown in the figure, the plurality of partitioned chambers formed by the partition include at least an air intake guide chamber 4 connected to the air inlet 12a. That is, the air drawn in through the air inlet 12a first enters the air intake guide chamber 4 and is then transported to the other partitioned chambers. A first guide pipe 7 serving as an airflow channel is installed inside the air intake guide chamber 4. A sound-absorbing component is provided on the outside of the first guide pipe 7. The sound-absorbing component includes at least a first covering component 8, which can be a sound-absorbing material such as sound-absorbing cotton. The first guide pipe 7 is connected to the external space of the housing 1 through the air inlet 12a of the housing 1. For example, the air inlet end 72 of the first guide pipe 7 can be sealed and connected to the air inlet 12a of the housing 1 or pass through the air inlet 12a. The air inlet guide chamber 4 is connected to the external space of the housing 1 through the first guide pipe 7 so that air in the external environment can be transmitted to the air inlet guide chamber 4 through the first guide pipe 7. The first guide pipe 7 is also connected to the adjacent downstream chamber (such as the fan installation chamber 5 shown in the figure) through the first vent 31 provided on the partition (vertical partition 3 in the figure). Thus, the airflow drawn in through the air inlet 12a is evenly supplied to the fan by the guidance of the first guide pipe 7 located in the air intake guide chamber 4. The noise generated by the airflow flowing in the first guide pipe 7 is absorbed by the first covering 8 made of sound-absorbing material covering the outside of the first guide pipe 7, thereby effectively reducing the outward transmission of noise and achieving a relatively good noise reduction effect.

[0050] The two side surfaces of the first covering 8 respectively contact the outer wall of the first guide tube 7 and the inner wall of the air inlet guide chamber 4, thus isolating the two side surfaces of the first covering 8 from the airflow in the air inlet guide chamber 4. This design largely prevents any particles that may be present in the first covering 8 from contacting the airflow in the air inlet guide chamber 4, thereby reducing the risk of these particles being supplied to the patient with the airflow. Therefore, even after long-term use, the ventilation therapy device can still maintain good ventilation quality and ensure the patient's ventilation safety. Since the outer wall surface area of ​​the first guide tube 7 in the airflow transmission direction is much larger than the end face area of ​​the first guide tube 7, the two side wall surfaces of the first covering 8 covering the outer periphery of the first guide tube 7 respectively abut against the outer wall of the first guide tube 7 and the inner side wall of the air intake guide chamber 4. This can effectively prevent most of the surface area of ​​the first covering 8 (i.e., the side wall surface area of ​​the first covering 8) from being isolated from the airflow, thereby greatly reducing the probability of the airflow in the air intake guide chamber 4 coming into contact with the particles that may exist in the first covering 8.

[0051] For the end face of the sound-absorbing component, a support structure can be provided inside the housing 1 to correspond to the end face, so that the end face of the sound-absorbing component is in contact with the surface of the support structure, thereby isolating the end face of the sound-absorbing component from the airflow inside the housing 1.

[0052] Although the end face area of ​​the first cover 8 is smaller than that of its side wall surface area, in order to more thoroughly prevent the first cover 8 from contacting the airflow in the air intake guide chamber 4, the first cover 8 can also be installed such that its end face is isolated from the airflow in the air intake guide chamber 4.

[0053] In a preferred embodiment, a first support boss 4a may be formed on the inner wall of the air intake chamber 4 or the outer wall of the first guide tube 7. The first support boss 4a corresponds to the end face of the first covering 8, such that the end face of the first covering 8 contacts the surface of the first support boss 4a. Thus, the end face of the first covering 8 is isolated from the airflow in the air intake chamber 4 by the first support boss 4a. With this arrangement, not only can the first support boss 4a define the covering position of the first covering 8 on the first guide tube 7 and its installation position in the air intake chamber 4, but it can also separate the end face of the first covering 8 from the airflow in the air intake chamber 4, thereby preventing the airflow in the air intake chamber 4 from contacting the end face of the first covering 8, and further reducing the risk that particulate matter in the first covering 8 will be mixed into the airflow and supplied to the patient with the airflow. Preferably, first support bosses 4a can be provided at both ends of the first covering member 8 in the air intake guide chamber 4 to confine the first covering member 8 between, for example, a pair of first support bosses 4a in the vertical direction.

[0054] like Figure 2 and Figure 3 As shown, a first support boss 4a is formed on the outer periphery of the first guide tube 7, so that the end face of the first cover 8 abuts against the surface of the first support boss 4a. When the first guide tube 7 and the first cover 8 are installed in the air intake guide chamber 4, the end face of the first cover 8 is isolated from the airflow in the air intake guide chamber 4.

[0055] Reference Figure 2As shown, in some preferred embodiments of the noise reduction device of the present invention, the air intake guide chamber 4 has a first region 41 located in one space (e.g., the upper space) of the first guide pipe 7 and a second region 42 located in the other space (e.g., the lower space) of the first guide pipe 7. The first guide pipe 7 also has a first outlet end 73 and a second outlet end 74. Airflow within the first guide pipe 7 can enter the first region 41 of the air intake guide chamber 4 through the first outlet end 73 and enter the second region 42 of the air intake guide chamber 4 through the second outlet end 74. The first region 41 of the air intake guide chamber 4 is formed as a dead cavity that restricts airflow. Noise generated during the flow of gas enters this dead cavity and is continuously reflected, thereby consuming some energy and reducing the transmission of noise. In the space of the second region 42, a first vent 31 is provided on the partition between the air intake guide chamber 4 and the adjacent partition chamber (such as the fan installation chamber 5 described later). Gas flowing in the second region 42 can flow into the adjacent partition chamber through the first vent 31.

[0056] In addition, combined Figure 3As shown, the first guide tube 7 may include a tube assembly body 71 and an air inlet end 72 connected to the tube assembly body 71. One or more first air inlet channels are formed within the tube assembly body 71 extending along a first direction (e.g., vertical direction as shown in the illustration), wherein the cross-sectional area of ​​the first air inlet channel is smaller than the cross-sectional area of ​​the air inlet end 72. A first covering member 8 covers at least the outer periphery of the tube assembly body 71. The air inlet end 72 extends outward from the tube assembly body 71 along a second direction (e.g., horizontal direction as shown in the illustration) at an angle relative to the first direction. The angle between the first and second directions can be set to 30°, 45°, 60°, 90°, etc. When the first guide tube 7 is installed in the air inlet guide chamber 4, its air inlet end 72 is in sealed communication with the air inlet 12a of the housing 1. For example, the air inlet end 72 can be sealed and connected to the air inlet 12a, passing through the air inlet 12a and extending outside the housing 1, thereby communicating with the external space of the housing 1. Therefore, on the one hand, the airflow changes direction when it enters the main body 71 of the pipe assembly from the inlet end 72, which consumes sound energy and reduces noise. On the other hand, since the cross-sectional area of ​​each first air intake channel in the main body 71 of the pipe assembly is smaller than that of the inlet end 72, the airflow changes flow area from a large cavity space to a small cavity space when it enters the first air intake channel from the inlet end 72, and then changes flow area from a small cavity space to a large cavity space when it enters the air intake guide chamber 4 from the first air intake channel. During the two changes in flow area, the sound wave undergoes compression and expansion, resulting in a change and consumption of sound energy, which also reduces noise. Moreover, the airflow is transported through multiple first air intake channels, which helps to stably and evenly supply air to the fan, thereby reducing noise generation.

[0057] In the noise reduction device of the present invention, the partition in the housing 1 can be configured in various forms to provide a suitable airflow path by dividing and forming multiple partitioned chambers, thereby achieving a good noise reduction effect. In some preferred embodiments, the partition divides the inner cavity of the housing 1 into multiple partitioned chambers, including the aforementioned air inlet guide chamber 4 on which the first guide pipe 7 is installed, the fan mounting chamber 5 communicating with the air inlet guide chamber 4, and the fan inlet chamber 6 communicating with the fan mounting chamber 5. After the airflow from the external space of the housing 1 enters the air inlet guide chamber 4 through the first guide pipe 7, it passes sequentially through the fan mounting chamber 5 and the fan inlet chamber 6 and is drawn into the fan installed in the fan mounting chamber 5, thereby supplying pressurized air to the outside. Thus, as Figure 6 As shown, the airflow passes through the fan installation chamber 5, which can also carry away some of the heat generated during the operation of the fan, thereby reducing the operating temperature of the fan.

[0058] In each compartment, in addition to the airflow channel, multiple dead air chambers can be formed. This allows noise generated during gas flow to be continuously reflected after entering the dead air chambers, thereby consuming some energy and reducing noise transmission. Furthermore, to avoid the noise reduction device occupying a large space in the vertical or horizontal direction, which would hinder its placement in the ventilation therapy equipment, the partitions and the resulting compartments can be optimally arranged.

[0059] In the preferred embodiment illustrated, the housing 1 is divided into a first chamber and a second chamber in a horizontal direction. The second chamber is configured as the air inlet guide chamber 4. The first chamber is divided into a fan inlet chamber 6 near the upper housing 11 and a fan mounting chamber 5 located below the fan inlet chamber 6. Therefore, since the air inlet guide chamber 4 is at the same horizontal height relative to the fan mounting chamber 5 and the fan inlet chamber 6, the overall height of the noise reduction device is avoided from being too high. Furthermore, the airflow within the three partitioned chambers extends the air path, further reducing noise.

[0060] The vertical partition 3 separating the air intake guide chamber 4 and the fan installation chamber 5 is provided with a first vent 31 that connects the air intake guide chamber 4 and the fan installation chamber 5. The housing 1 is provided with a horizontal partition 2. The horizontal partition 2 can be formed with a second vent 21 that connects the fan installation chamber 5 to the fan intake chamber 6 and a third vent 24 that connects the fan intake chamber 6 to the fan inlet 51 of the fan installed in the fan installation chamber 5. This allows the airflow drawn in by the inlet 12a and transported by the first guide pipe 7 to pass sequentially through the air intake guide chamber 4, the fan installation chamber 5 and the fan intake chamber 6 into the fan installed in the fan installation chamber 5. A second guide pipe can be provided at the second vent 21 position to guide airflow from the fan installation chamber 5 to the fan inlet chamber 6, serving as an airflow channel connecting the fan installation chamber 5 and the fan inlet chamber 6. The second guide pipe can have a structure and noise reduction installation method that are substantially the same as the aforementioned first guide pipe 7.

[0061] Specifically, a second guide pipe can be provided on the horizontal partition 2 (such as at the location of the second vent 21) to connect the fan installation chamber 5 and the fan inlet chamber 6. The second guide pipe can have one or more second air inlet channels and is provided with a sound-absorbing component on its exterior. The sound-absorbing component includes at least a second covering component. The second covering component is provided with a sound-absorbing material (such as sound-absorbing cotton). The two side walls of the second covering component are respectively in contact with the outer side wall of the second guide pipe and the inner side wall of the fan installation chamber 5 and / or the fan inlet chamber 6 where it is located, so that the two side walls of the second covering component are isolated from the airflow in the fan installation chamber 5 or the fan inlet chamber 6 where it is located. Therefore, similar to the first covering 8 mentioned above, this arrangement can utilize the second covering to absorb the sound wave energy generated by the airflow from the fan mounting chamber 5 to the fan inlet chamber 6, reducing the generation and transmission of noise. At the same time, it can also effectively prevent particles that may exist in the second covering from coming into contact with the airflow from the fan mounting chamber 5 to the fan inlet chamber 6, thereby reducing the risk of these particles being supplied to the patient along with the airflow.

[0062] Furthermore, a second support boss can be formed on the inner side wall of the fan mounting chamber 5 and the fan inlet chamber 6 or on the outer side wall of the second guide pipe corresponding to the end face of the second cover. The end face of the second cover contacts the surface of the second support boss, so that the end face of the second cover is isolated from the airflow in the fan mounting chamber 5 or the fan inlet chamber 6 where it is located. This can prevent the airflow in the fan mounting chamber 5 or the fan inlet chamber 6 from contacting the end face of the second cover, further reducing the risk that particulate matter in the second cover is mixed into the airflow and supplied to the patient with the airflow.

[0063] The aforementioned horizontal partition 2 and vertical partition 3 can be configured as components independent of the housing 1 or integrally formed with the housing 1. For ease of disassembly and maintenance, as mentioned above, the housing 1 may include an upper housing 11 and a lower housing 12, with the upper housing 11 snap-fitted to the upper opening of the lower housing 12. An air inlet 12a may be formed on the lower housing 12, and an air outlet 12b for discharging airflow from the housing 1 may also be formed on the lower housing 12. In a preferred embodiment, the horizontal partition 2 is installed between the upper housing 11 and the lower housing 12, and the air inlet 12a and air outlet 12b are formed on the lower housing 12. Therefore, during the assembly process, the first flow guide pipe 7, which is covered with sound-absorbing cotton, and the fan housing 9 (which will be described in detail later) can be positioned and installed on the horizontal partition 2. Then, the horizontal partition 2 is sealed on the upper end of the lower housing 12, so that the ports of the first flow guide pipe 7 and the fan are sealed and connected to the corresponding air inlet 12a and air outlet 12b on the corresponding lower housing 12. Finally, the upper housing 11 is connected to the upper part of the lower housing 12.

[0064] Figure 4The internal structure of the upper housing 11 in a preferred embodiment is shown. Within the fan inlet chamber 6, a plurality of arc-shaped guide ribs 11a extending towards the horizontal partition 2 and spaced apart circumferentially can be formed on the inner side of the upper housing 11 (i.e., the side facing the lower housing 12). These arc-shaped guide ribs 11a can be provided in one or more sets. Figure 2 and Figure 5 As shown, in a preferred embodiment of the noise reduction device, the fan installed in the fan mounting chamber 5 has an air inlet 51. In addition to the aforementioned second vent 21 that connects the fan mounting chamber 5 to the fan air inlet chamber 6, a third vent 24 is also provided on the horizontal partition 2 corresponding to the air inlet 51, so that the fan air inlet 51 is sealed and connected to the fan air inlet chamber 6 through the third vent 24. Therefore, when the airflow enters the fan inlet chamber 6 from the fan mounting chamber 5, at least part of the airflow can be guided by the arc-shaped guide ribs 11a to flow circumferentially and dispersed into multiple airflows, which then flow from different directions to the fan mounting chamber 5 (i.e. to the third vent 24), and are then supplied to the fan inlet 51 located in the fan mounting chamber 5. The arc-shaped guide ribs 11a can guide the airflow to flow smoothly into the fan inlet 51, thereby reducing the airflow noise on the fan inlet side. Moreover, the multiple arc-shaped guide ribs 11a separate the airflow into multiple airflows, reducing the wind resistance on the fan inlet side, thereby further reducing the noise of airflow transmission.

[0065] Furthermore, at the position corresponding to the third vent 24, the horizontal baffle 2 can also form a guide protrusion 22 protruding towards the fan inlet chamber 6. Multiple guide ports 22a communicating with the third vent 24 are formed on the peripheral wall of this guide protrusion 22. The airflow in the fan inlet chamber 6 flows sequentially through the guide ports 22a and the third vent 24 into the fan inlet 51 installed in the fan mounting chamber 5, so that the airflow in the fan inlet chamber 6 is evenly supplied to the fan. By forming multiple circumferentially distributed guide ports 22a upstream of the fan inlet, the airflow can be further guided to be stably and evenly supplied to the fan, reducing its operating noise. In addition, a guide cone 22b extending towards the fan mounting chamber 5 can be formed on the inner side of the top wall of the guide protrusion 22. Along the direction toward the fan, the horizontal cross-section of the guide cone 22b decreases, which guides the airflow from the fan inlet chamber 6 into the fan casing 9 as described later, thereby avoiding the formation of turbulence above it and reducing noise generation.

[0066] Typically, a fan housing 9 for mounting the fan can be provided inside the fan mounting chamber 5. This fan housing 9 is usually made of a soft material such as soft rubber or silicone, which can effectively absorb the mechanical energy generated by vibration during fan operation and reduce noise transmission. When the horizontal partition 2 has the aforementioned guide protrusion 22, the fan housing 9 can be installed with its inlet aligned with the guide protrusion 22. The inlet of the fan housing 9 corresponds to the air inlet 51 of the fan installed therein, so that air is stably supplied to the fan under the guidance of the guide protrusion 22. In this design, at the inlet of the fan housing 9, an annular protrusion 91 is formed that fits against the bottom surface of the horizontal partition 2. This allows the inlet of the fan housing 9 and the air inlet 51 of the fan to be sealed and connected to the fan intake chamber 6 through the guide port 22a on the guide protrusion 22. This ensures that the airflow in the fan intake chamber 6 enters only the air inlet 51 of the fan through the third vent 24, and does not enter other areas of the fan installation chamber 5 except for the air inlet 51, thus ensuring the airflow sealing at the fan intake end and guaranteeing the fan's operating efficiency. The fan housing 9 can be installed in the fan installation chamber 5 in various suitable ways. Multiple fan housing connecting grooves 23, distributed around the guide protrusion 22, can be formed on the horizontal partition 2, allowing the upper end of the fan housing 9 to be connected to the horizontal partition 2 through these connecting grooves 23. In addition, the fan installed inside the fan housing 9 may also have an air outlet, which is connected to the air outlet 12b on the housing 1 to output pressurized airflow.

[0067] Figure 7 A partially enlarged structure of a noise reduction device according to another preferred embodiment of the present invention is shown, which can be combined with the aforementioned. Figures 1 to 6 The preferred embodiments described herein have a generally similar structure; the differences will be described only here.

[0068] like Figure 7 As shown, the housing 1 of the noise reduction device has an inner housing layer 1a and an outer housing layer 1b, and a sealed chamber 1c is defined between the inner housing layer 1a and the outer housing layer 1b. This sealed chamber 1c can be formed into a vacuum space through vacuum compression or other methods, or it can be filled with a first covering element, such as polyester fiber sound-absorbing cotton or sponge, thereby further blocking noise from being transmitted outward from the housing 1 and improving the user experience. In this case, there is no need to design complex airflow paths and noise reduction structures within the housing 1, resulting in better noise absorption and blocking effects compared to a single-layer housing.

[0069] Furthermore, the present invention also provides a ventilation therapy device with the aforementioned noise reduction device, wherein a fan is installed inside the housing of the noise reduction device, such as by means of the aforementioned fan housing 9 installed in the fan mounting chamber 5. With the noise reduction device provided by the present invention, the ventilation therapy device can supply clean breathing gas to the patient with lower noise, and has advantages such as high safety and a good user experience.

[0070] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various specific technical features in any suitable manner. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately. However, these simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A noise reduction device, characterized in that, include: The housing (1) has an airflow channel inside, which is used to transmit airflow inside the housing (1). A sound-absorbing component is provided outside the airflow channel. The sound-absorbing component includes sound-absorbing material and is configured to be isolated from the airflow inside the housing (1).

2. The noise reduction device according to claim 1, characterized in that, Each surface of the sound-absorbing element is configured to contact the corresponding adjacent surface inside the housing (1) to isolate it from the airflow inside the housing (1).

3. The noise reduction device according to claim 2, characterized in that, The sound-absorbing component covers the outside of the airflow channel; one side wall of the sound-absorbing component contacts the outer side wall of the airflow channel, and the other side wall contacts the inner side wall of the housing (1) or the corresponding adjacent surface inside the housing (1) to isolate the airflow inside the housing (1).

4. The noise reduction device according to claim 2 or 3, characterized in that, A support structure is formed inside the housing (1) corresponding to the end face of the sound-absorbing component. The end face of the sound-absorbing component is in contact with the surface of the support structure, so that the end face of the sound-absorbing component is isolated from the airflow inside the housing (1).

5. The noise reduction device according to claim 2, characterized in that, The housing (1) has a plurality of partitioned chambers; wherein at least one of the partitioned chambers is provided with an airflow channel for transmitting airflow, and / or, two of the partitioned chambers are provided with an airflow channel for connecting the two partitioned chambers.

6. The noise reduction device according to claim 5, characterized in that, The plurality of the partitioned chambers include an air intake guide chamber (4), a fan installation chamber (5) communicating with the air intake guide chamber (4), and a fan inlet chamber (6) communicating with the fan installation chamber (5); the airflow from the external space of the housing (1) passes sequentially through the air intake guide chamber (4), the fan installation chamber (5), and the fan inlet chamber (6) and enters the fan installed in the fan installation chamber (5).

7. The noise reduction device according to claim 6, characterized in that, The air intake guide chamber (4) is provided with the airflow channel, which is configured as a first guide pipe (7). The air intake guide chamber (4) is connected to the external space of the housing (1) through the first guide pipe (7). The first flow guide pipe (7) is covered with the sound-absorbing component. The sound-absorbing component is configured as a first covering (8). The two side walls of the first covering (8) are respectively in contact with the outer side wall of the first flow guide pipe (7) and the inner side wall of the air intake flow guide chamber (4), so that the two side walls of the first covering (8) are isolated from the airflow in the air intake flow guide chamber (4).

8. The noise reduction device according to claim 7, characterized in that, A first support boss (4a) is formed on the inner side wall of the air intake guide chamber (4) or the outer side wall of the first guide pipe (7) corresponding to the end face of the first cover (8). The end face of the first cover (8) is in contact with the surface of the first support boss (4a), so that the end face of the first cover (8) is isolated from the airflow in the air intake guide chamber (4).

9. The noise reduction device according to claim 7, characterized in that, The air intake guide chamber (4) has a first region (41) located above the first guide pipe (7) and a second region (42) located below the first guide pipe (7); the first guide pipe (7) includes a first outlet end (73) and a second outlet end (74); The airflow in the first guide pipe (7) enters the first region (41) through the first outlet (73); the first region (41) forms a dead cavity that restricts the flow of air. The airflow in the first guide pipe (7) enters the second region (42) through the second outlet (74), and the second region (42) is connected to the fan installation chamber (5).

10. The noise reduction device according to claim 7, characterized in that, The first guide pipe (7) includes a pipe assembly body (71) and an air inlet end (72) communicating with the pipe assembly body (71). The pipe assembly body (71) has one or more first air inlet channels extending along a first direction, wherein the cross-sectional area of ​​the first air inlet channel is smaller than the cross-sectional area of ​​the air inlet end. The first cover (8) covers at least the outer periphery of the pipe assembly body (71). The air inlet end (72) extends outward from the pipe assembly body (71) along a second direction at an angle relative to the first direction. When the pipe assembly body (71) is disposed in the air inlet guide chamber (4), the air inlet end (72) communicates with the external space of the housing (1).

11. The noise reduction device according to claim 6, characterized in that, The housing (1) includes a lower housing (12) and an upper housing (11) fastened to the lower housing (12); The housing (1) is divided into a first cavity and a second cavity in the horizontal direction, wherein the second cavity is configured as the air intake guide chamber (4), and the first cavity is divided into the fan air intake chamber (6) near the upper housing (11) and the fan mounting chamber (5) located below the fan air intake chamber (6).

12. The noise reduction device according to claim 11, characterized in that, The housing (1) is provided with a horizontal partition (2), and a second vent (21) and a third vent (24) are respectively opened on the horizontal partition (2); The second vent (21) is used to connect the fan mounting chamber (5) and the fan inlet chamber (6); the fan installed in the fan mounting chamber (5) has an air inlet (51), and the air inlet (51) is sealed and connected to the fan inlet chamber (6) through the third vent (24).

13. The noise reduction device according to claim 12, characterized in that, The horizontal partition (2) is provided with a guide protrusion (22) protruding towards the fan inlet chamber (6) corresponding to the third vent (24). Multiple guide ports (22a) are formed on the peripheral wall of the guide protrusion (22) and communicate with the third vent (24). The airflow in the fan inlet chamber (6) flows into the fan inlet (51) installed in the fan mounting chamber (5) through the guide ports (22a) and the third vent (24) in sequence.

14. The noise reduction device according to claim 13, characterized in that, The inner side of the top wall of the guide protrusion (22) is formed with a guide cone (22b) that gradually tapers toward the fan installation chamber (5).

15. The noise reduction device according to claim 12, characterized in that, The fan installation chamber (5) is provided with a fan housing (9) for installing the fan. The fan housing (9) has an inlet corresponding to the air inlet (51) of the fan. Around the inlet of the fan housing (9), an annular protrusion (91) is formed that fits against the bottom surface of the horizontal partition (2), so that the air inlet (51) of the fan installed in the fan housing (9) is sealed and connected to the third vent (24) through the annular protrusion (91).

16. The noise reduction device according to claim 12, characterized in that, The fan inlet chamber (6) has a plurality of arc-shaped guide ribs (11a) that extend toward the horizontal partition (2) and are spaced apart from each other in the circumferential direction. The plurality of guide ribs (11a) guide the airflow in the fan inlet chamber (6) toward the air inlet (51).

17. The noise reduction device according to claim 6, characterized in that, The airflow channel is connected between the fan installation chamber (5) and the fan inlet chamber (6). The airflow channel is configured as a second guide pipe. The second guide pipe includes one or more second inlet channels. The sound-absorbing component is covered on the outside of the second guide pipe. The sound-absorbing component is configured as a second covering. The two side walls of the second covering are respectively in contact with the outer side wall of the second guide pipe and the inner side wall of the fan installation chamber (5) or the fan inlet chamber (6) where it is located, so that the two side walls of the second covering are isolated from the airflow in the fan installation chamber (5) or the fan inlet chamber (6) where it is located.

18. The noise reduction device according to claim 17, characterized in that, A second support boss is formed on the inner side wall of the fan installation chamber (5) and the fan inlet chamber (6) or on the outer side wall of the second guide pipe corresponding to the end face of the second cover. The end face of the second cover is in contact with the surface of the second support boss, so that the end face of the second cover is isolated from the airflow in the fan installation chamber (5) or the fan inlet chamber (6) where it is located.

19. The noise reduction device according to claim 1, characterized in that, The housing (1) has an inner housing layer (1a) and an outer housing layer (1b), and a sealed cavity (1c) is formed between the inner housing layer (1a) and the outer housing layer (1b). The sealed cavity (1c) forms a vacuum space or is filled with sound-absorbing material.

20. A ventilation therapy device, characterized in that, The ventilation therapy device includes a noise reduction device according to any one of claims 1 to 19.

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