Ventilation treatment equipment and noise reduction device thereof

Abstract

The utility model relates to the field of ventilation treatment equipment, and discloses ventilation treatment equipment and a noise reduction device thereof, the noise reduction device comprises a shell (1), an airflow channel is arranged in the shell (1), the airflow channel is used for transmitting airflow in the shell (1), a sound absorption piece is arranged outside the airflow channel, the sound absorption piece comprises a sound absorption material, and the sound absorption material is used for absorbing the airflow in the shell (1). The sound absorption piece is arranged to be isolated from airflow in the shell (1). According to the noise reduction device, sound wave energy can be absorbed by the sound absorption material of the sound absorption part when noise waves in the shell penetrate through the sound absorption part outside the airflow channel to be transmitted, and therefore generation and outward transmission of noise are effectively reduced. Due to the fact that the sound absorption piece is arranged to be isolated from the air flow in the shell, it can be avoided that particles possibly existing in the sound absorption piece make contact with the air flow in the shell to a great extent, the risk that the particles are supplied to a patient along with the air flow is reduced, and ventilation safety of the patient is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to ventilation therapy equipment, concretely relates to a noise reduction device. On this basis, the utility model further relates to a ventilation therapy equipment with the noise reduction device. BACKGROUND

[0002] In modern clinical medicine, ventilation therapy equipment is widely used in anesthesia respiratory management, respiratory support treatment and emergency resuscitation. This kind of ventilation therapy equipment usually uses a fan to compress air, improves the pressure of gas, and delivers the gas for breathing to the airway of the patient. Since some patients need to place the ventilation therapy equipment beside for long-term continuous use, the treatment process is required to be as quiet and comfortable as possible. However, during the operation of the fan, the gas flowing in the machine body will produce high noise, which will greatly affect the patient's sleep.

[0003] To this end, a noise reduction box is usually built into the ventilation therapy equipment, and the fan is contained in the noise reduction box to reduce the propagation of noise to the external environment during its operation. The noise reduction box can be set to achieve its noise reduction effect in various ways, such as setting sound-absorbing cotton in the airflow channel, changing the airflow flow path, etc. However, after long-term use or multiple disinfections, the porous nature of the sound-absorbing cotton can easily cause it to contain fine particulate matter, which can easily be supplied to the patient along with the airflow in the ventilation therapy equipment operating state, adversely affecting the patient's health. SUMMARY

[0004] The utility model aims at overcoming the problem that the noise reduction box in the prior art ventilation therapy equipment cannot meet the noise reduction requirements and patient respiratory safety, and provides a noise reduction device that not only facilitates relatively good noise reduction effect, but also effectively prevents particulate matter from being supplied to the patient along with the airflow, ensuring the quality of the airflow and the physical and mental health of the patient.

[0005] To achieve the above-mentioned purpose, the utility model provides a noise reduction device, which comprises a shell, a airflow channel is provided in the shell, the airflow channel is used for transmitting the airflow in the shell, a sound-absorbing piece is arranged outside the airflow channel, the sound-absorbing piece comprises sound-absorbing material, and the sound-absorbing piece is arranged to be mutually isolated from the airflow in the shell.

[0006] Preferably, each surface of the sound-absorbing piece is arranged to be in contact with the corresponding adjacent surface in the shell to isolate the airflow in the shell.

[0007] Preferably, the sound-absorbing piece is wrapped outside the airflow channel; one side wall of the sound-absorbing piece is in contact with the outer side wall of the airflow channel, and the other side wall is in contact with the inner side wall of the shell or the corresponding adjacent surface in the shell to isolate the airflow in the shell.

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

[0009] Preferably, a plurality of separated chambers are formed in the shell; wherein at least one of the separated chambers is provided with the airflow passage for transmitting airflow, and / or the airflow passage is provided between two of the separated chambers for communicating the two separated chambers.

[0010] Preferably, the plurality of separated chambers include an air inlet guide chamber, a fan mounting chamber in communication with the air inlet guide chamber, and a fan air inlet chamber in communication with the fan mounting chamber; the airflow from the space outside the shell passes through the air inlet guide chamber, the fan mounting chamber, and the fan air inlet chamber in sequence to enter the fan mounted in the fan mounting chamber.

[0011] Preferably, the air inlet guide chamber is provided with the airflow passage, which is a first guide pipe member, and the air inlet guide chamber is in communication with the space outside the shell through the first guide pipe member.

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

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

[0014] Preferably, the air inlet guide chamber has a first region in the space above the first guide pipe member and a second region in the space below the first guide pipe member; the first guide pipe member includes a first outflow end and a second outflow end.

[0015] The airflow in the first guide pipe member enters the first region through the first outflow end; the first region forms a dead chamber that limits the flow of airflow.

[0016] The airflow in the first guide pipe member enters the second region through the second outflow end, and the second region is in communication with the fan mounting chamber.

[0017] Preferably, the first flow guide pipe member comprises a pipe group body and an air inlet end head in communication with the pipe group body, wherein one or more first air inlet channels extending in a first direction are formed in the pipe group body, wherein the cross-sectional area of the first air inlet channel is smaller than that of the air inlet end head; the first cover member at least covers the outer periphery of the pipe group body; the air inlet end head extends outward from the pipe group body in a second direction which is at an angle relative to the first direction, and when the pipe group body is arranged in the air inlet flow guide chamber, the air inlet end head is in communication with the external space of the shell.

[0018] Preferably, the shell comprises a lower shell and an upper shell which is connected to the lower shell by snap fit;

[0019] The shell is divided into a first cavity and a second cavity in the horizontal direction, wherein the second cavity is arranged as the air inlet flow guide chamber, and the first cavity is divided into the fan air inlet chamber close to the upper shell and the fan mounting chamber below the fan air inlet chamber.

[0020] Preferably, a horizontal partition plate is arranged in the shell, and a second air vent and a third air vent are respectively arranged on the horizontal partition plate;

[0021] The second air vent is used to communicate the fan mounting chamber and the fan air inlet chamber; the fan arranged in the fan mounting chamber has an air inlet, and the air inlet is in sealed communication with the fan air inlet chamber through the third air vent.

[0022] Preferably, a flow guide protrusion protruding towards the fan air inlet chamber is arranged on the horizontal partition plate corresponding to the third air vent, a circumferential wall of the flow guide protrusion is formed with a plurality of flow guide openings in communication with the third air vent, and the airflow in the fan air inlet chamber flows into the air inlet of the fan arranged in the fan mounting chamber through the flow guide openings and the third air vent in sequence.

[0023] Preferably, a flow guide cone gradually tapering and extending towards the fan mounting chamber is formed in the inner side of the top wall of the flow guide protrusion.

[0024] Preferably, a fan shell for mounting the fan is arranged in the fan mounting chamber, an inlet corresponding to the air inlet of the fan is arranged on the fan shell, and an annular protrusion fitted with the bottom surface of the horizontal partition plate is formed around the inlet of the fan shell, so that the air inlet of the fan arranged in the fan shell is in sealed communication with the third air vent through the annular protrusion.

[0025] Preferably, a plurality of arc-shaped flow guide ribs extending towards the horizontal partition plate and distributed in the circumferential direction are formed in the fan air inlet chamber on the inner side of the upper shell, and the plurality of flow guide ribs guide the airflow in the fan air inlet chamber to flow towards the air inlet.

[0026] Preferably, the airflow passage is communicated between the fan mounting chamber and the fan air inlet chamber, the airflow passage is provided as a second flow guide pipe, the second flow guide pipe comprises one or more second air inlets, and an outer side wall of the second flow guide pipe is covered by the sound absorbing member provided as a second covering member, two side walls of the second covering member are in corresponding contact with the outer side wall of the second flow guide pipe and an inner side wall of the fan mounting chamber or the fan air inlet chamber where the second covering member is located, so that the two side walls of the second covering member are mutually isolated from the airflow in the fan mounting chamber or the fan air inlet chamber.

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

[0028] Preferably, the shell has an inner shell layer and an outer shell layer, a sealed chamber is formed between the inner shell layer and the outer shell layer, and a vacuum space is formed in the sealed chamber or the sealed chamber is filled with sound absorbing material.

[0029] The second aspect of the utility model provides a ventilation treatment device, and the ventilation treatment device has the above-mentioned noise reduction device.

[0030] Through the above technical solution, the noise reduction device of the utility model can make the airflow flow through the airflow passage in the shell, and the noise sound waves in the shell can absorb the sound wave energy of the sound absorbing material of the sound absorbing member when propagating through the sound absorbing member outside the airflow passage, thereby effectively reducing the generation and outward transmission of noise, achieving a relatively good noise reduction effect. Since the sound absorbing member is arranged to be mutually isolated from the airflow in the shell, the particulate matter that may exist in the sound absorbing member can be largely prevented from contacting the airflow in the shell, thereby reducing the risk of further supplying these particulate matters to the patient along with the airflow, and ensuring the ventilation safety of the patient. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a perspective view of the noise reduction device according to a preferred embodiment of the utility model;

[0032] Figure 2 is Figure 1 is a sectional view of the noise reduction device in

[0033] Figure 3 is Figure 2 is a perspective view of the first flow guide pipe of the noise reduction device in the first aspect of the utility model, and the first flow guide pipe is covered by the first covering member;

[0034] Figure 4 is Figure 2 is a perspective view of an upper shell of a noise reduction device;

[0035] Figure 5 is Figure 2 is a perspective view of a horizontal partition plate of a noise reduction device;

[0036] Figure 6 is a schematic view showing a flow path of air flow in a noise reduction device; Figure 2

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

[0038] BRIEF DESCRIPTION OF DRAWINGS

[0039] 1 - shell; 11 - upper shell; 11a - arc-shaped flow guide rib; 12 - lower shell; 12a - air inlet; 12b - air outlet; 1a - inner shell; 1b - outer shell; 1c - sealing chamber; 2 - horizontal partition plate; 21 - second air vent; 22 - flow guide protrusion; 23 - fan shell connecting groove; 22a - flow guide opening; 22b - flow guide cone; 24 - third air vent; 3 - vertical partition plate; 31 - first air vent; 4 - air inlet flow guide chamber; 41 - first region; 42 - second region; 4a - first support boss; 5 - fan mounting chamber; 51 - air inlet; 6 - fan air inlet chamber; 7 - first flow guide pipe fitting; 71 - pipe group main body; 72 - air inlet end head; 73 - first outflow end; 74 - second outflow end; 8 - first cladding; 9 - fan shell; 91 - annular protrusion. DETAILED DESCRIPTION

[0040] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely intended to illustrate and explain the present application, and are not intended to limit the present application.

[0041] In the present application, unless otherwise stated, the orientation words such as "up, down, left, right" generally refer to the up, down, left, right shown in the drawings; "inner, outer" refers to the inner, outer relative to the contour of each component itself.

[0042] Referring to Figure 1 and Figure 2 ​As shown, according to the noise reduction device of the preferred embodiment of the present application, a shell 1 is provided, and a gas flow channel is arranged in the shell 1, which is used to transmit the gas flow in the shell 1, such as the first flow guide pipe 7 or the second flow guide pipe described later, to guide the gas flow in the shell 1 or to communicate from one partitioned chamber in the shell 1 to the adjacent partitioned chamber, and then to uniformly supply the gas to the fan installed in the shell 1, for example. Wherein, the sound absorption piece is arranged outside the gas flow channel, and the sound absorption piece comprises sound absorption material and is arranged to be mutually isolated from the gas flow in the shell 1.

[0043] Therefore, when the noise sound wave in the shell 1 propagates through the sound absorption piece outside the gas flow channel, the sound wave energy can be absorbed by the sound absorption material of the sound absorption piece, thereby effectively reducing the generation and outward transmission of noise, and achieving a relatively good noise reduction effect. Since the sound absorption piece is arranged to be mutually isolated from the gas flow in the shell 1, the particulate matter that may exist in the sound absorption piece can be largely avoided from contacting the gas flow in the shell, and when used in a ventilation therapy device such as a breathing machine, the noise reduction device can reduce the risk of further supplying these particulate matters to the patient along with the gas flow, thereby ensuring the ventilation safety of the patient.

[0044] The sound absorption piece described above can be arranged in various suitable manners outside the gas flow channel and mutually isolated from the gas flow in the shell 1. In the preferred embodiment of the present application, each surface of the sound absorption piece is arranged to be in contact with the corresponding adjacent surface in the shell 1 to be isolated from the gas flow in the shell 1, thereby making the surface of the sound absorption piece covered by the surface of the shell 1 adjacent to the sound absorption piece to prevent the gas flow from flowing through the surface of the sound absorption piece and to prevent the particulate matter that may exist in the sound absorption piece from being carried by the gas flow.

[0045] Specifically, the sound absorption piece can be wrapped outside the gas flow channel, for example, as shown in the following figure: Figure 3 As shown, the first wrapping piece 8 as the sound absorption piece or as a part of the sound absorption piece can be wrapped outside the first flow guide pipe 7 as the gas flow channel. On this basis, one side wall of the sound absorption piece is in contact with the outer side wall of the gas flow channel, and the other side wall is in contact with the inner side wall of the shell 1 or the corresponding adjacent surface in the shell 1, so as to isolate the gas flow in the shell 1. Since the outer side wall surface area of the gas flow channel in the gas flow direction is much larger than the end surface area of the gas flow channel, by making the two side walls of the sound absorption piece wrapped outside the gas flow channel respectively in contact with the outer side wall of the gas flow channel and the inner side wall of the shell 1 or the corresponding adjacent surface in the shell 1, the vast majority of the surface area of the sound absorption piece (i.e. the side wall surface area of the sound absorption piece) can be effectively isolated from the gas flow, thereby ensuring that the shell gas flow quality is not affected by the particulate matter that may exist in the sound absorption piece.

[0046] For the end surface of the sound absorbing member, a support structure can be provided in the housing 1 corresponding to the end surface, and the end surface of the sound absorbing member is in contact with the surface of the support structure, so that the end surface of the sound absorbing member is isolated from the airflow in the housing 1.

[0047] Typically, the housing 1 can have an air inlet 12a and an air outlet 12b. In the state for use in a ventilation therapy device, a fan can be installed in the housing 1, which can suck air in the external environment through the air inlet 12a and supply it to the patient (usually also through a humidification tank, etc.) after being pressurized through the air outlet 12b. In order to facilitate disassembly and maintenance, the housing 1 can include an upper housing 11 and a lower housing 12, the upper housing 11 being connected to the upper end opening of the lower housing 12 by snap connection and being integrally connected by fasteners such as bolts. Generally, the housing 1 can be made of plastic, hard alloy, etc., and plastic is preferred to have good strength and noise shielding effect.

[0048] In some preferred embodiments, a plurality of separate chambers separated by partitions can be formed in the housing 1, for example, in the preferred embodiment shown, the space in the upper housing 11 and the lower housing 12 is separated by a horizontal partition 2 and a vertical partition 3, forming the air inlet guide chamber 4, the fan installation chamber 5 and the fan air inlet chamber 6 as separate chambers. Among them, the air inlet 12a of the housing 1 is communicated to the air inlet guide chamber 4, and the air outlet 12b is communicated to the air outlet of the fan. In combination Figure 6 As shown by the arrows, under the action of the fan, the air sucked in through the air inlet 12a can be sequentially passed through the air inlet guide chamber 4, the fan installation chamber 5 and the fan air inlet chamber 6 and sucked by the fan installed in the fan installation chamber 5, and then supplied outward through the air outlet 12b. As mentioned above, in the noise reduction device of the present application, the airflow passage for transmitting airflow can be provided in at least one of the separate chambers, and / or the airflow passage can be provided to communicate two adjacent separate chambers to guide the airflow to flow in the corresponding separate chamber or between adjacent separate chambers.

[0049] In the noise reduction device of the illustrated preferred embodiment, the plurality of separated chambers separated by the partition plate at least includes the air inlet guide chamber 4 which is communicated with the air inlet 12a, that is, the air sucked in by the air inlet 12a first enters the air inlet guide chamber 4 and then is transported to other separated chambers. The air inlet guide chamber 4 is provided with a first flow guide pipe 7 as an air flow passage, and the first flow guide pipe 7 is externally provided with a sound absorbing piece, which at least includes a first cladding piece 8 which can be a sound absorbing material such as sound absorbing cotton. The first flow guide pipe 7 is communicated with the outside space of the housing 1 through the air inlet 12a of the housing 1, for example, the air inlet end 72 of the first flow guide pipe 7 can be sealingly butted or passes through the air inlet 12a of the housing 1, and the air inlet guide chamber 4 is communicated with the outside space of the housing 1 through the first flow guide pipe 7, so that the air in the external environment can be transmitted into the air inlet guide chamber 4 through the first flow guide pipe 7; the first flow guide pipe 7 is also communicated with the adjacent downstream chamber (such as the fan mounting chamber 5) through the first air vent 31 provided on the partition plate (illustrated as a vertical partition plate 3). Thus, the air flow sucked in by the air inlet 12a is uniformly supplied to the fan through the guidance of the first flow guide pipe 7 provided in the air inlet guide chamber 4, and the noise sound waves generated by the air flow flowing in the first flow guide pipe 7 are absorbed by the first cladding piece 8 made of sound absorbing material cladded on the outside of the first flow 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 cladding piece 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 inlet guide chamber 4, so that the two side surfaces of the first cladding piece 8 are isolated from the air flow in the air inlet guide chamber 4. By this arrangement, the contact between the possible particulate matters in the first cladding piece 8 and the air flow in the air inlet guide chamber 4 can be largely avoided, thereby reducing the risk of these particulate matters being supplied to the patient with the air flow, and thus ensuring a good ventilation quality of the ventilation treatment device and the ventilation safety of the patient even after long-term use. Since the outer side wall surface area of the first flow guide pipe 7 in the air flow transmission direction is much larger than the end surface area of the first flow guide pipe 7, the two side walls of the first cladding piece 8 cladded on the outer periphery of the first flow guide pipe 7 are respectively in abutting contact with the outer side wall of the first flow guide pipe 7 and the inner side wall of the air inlet guide chamber 4, which can effectively avoid the isolation of most of the surface area of the first cladding piece 8 (i.e. the side wall surface area of the first cladding piece 8) from the air flow, thereby largely reducing the probability of the contact between the air flow in the air inlet guide chamber 4 and the possible particulate matters in the first cladding piece 8.

[0051] For the end surface of the sound absorbing piece, a support structure can be provided in the housing 1 corresponding to the end surface, and the end surface of the sound absorbing piece is in contact with the surface of the support structure, thereby isolating the end surface of the sound absorbing piece from the air flow in 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 the noise reduction device of some preferred embodiments of the present application, the air inlet flow guide chamber 4 has a first region 41 located in the space (for example, the upper space) on one side of the first flow guide pipe 7 and a second region 42 located in the space (for example, the lower space) on the other side of the first flow guide pipe 7, and the first flow guide pipe 7 has a first outflow end 73 and a second outflow end 74. The airflow in the first flow guide pipe 7 can enter the first region 41 of the air inlet flow guide chamber 4 through the first outflow end 73 and enter the second region 42 of the air inlet flow guide chamber 4 through the second outflow end 74. Among them, the first region 41 of the air inlet flow guide chamber 4 is formed as a dead chamber to limit the flow of airflow, and the noise generated by the gas during the flow process is continuously reflected after entering the dead chamber, thereby consuming part of the energy and reducing the transmission of noise; and a first air vent 31 is provided on the partition plate separating the air inlet flow guide chamber 4 and the adjacent partition chamber (such as the fan mounting chamber 5 which will be described later) in the second region 42 space, and the gas flowing in the second region 42 can flow into the adjacent partition chamber through the first air vent 31.

[0056] In addition, in combination with Figure 3As shown, the first flow guide pipe member 7 can include a pipe group body 71 and an air inlet end head 72 connected to the pipe group body 71, the pipe group body 71 is formed with one or more first air inlet channels extending in a first direction (for example, the vertical direction as shown), wherein the cross-sectional area of the first air inlet channel is smaller than the cross-sectional area of the air inlet end head 72; the first cover member 8 at least covers the outer periphery of the pipe group body 71; the air inlet end head 72 extends outward from the pipe group body 71 in a second direction (for example, the horizontal direction as shown) that is angled relative to the first direction. The included angle between the first direction and the second direction can be set to 30°, 45°, 60°, 90°, etc. In the state that the first flow guide pipe member 7 is installed in the air inlet flow guide chamber 4, the air inlet end head 72 is in sealed communication with the air inlet 12a of the shell 1, for example, the air inlet end head 72 can be sealingly butted with the air inlet 12a, sealingly pass through the air inlet 12a and extend out of the shell 1, thereby being communicated to the outside space of the shell 1. In this way, on the one hand, the airflow changes the airflow transmission direction once when entering the pipe group body 71 from the air inlet end head 72, which can cause the consumption of sound wave energy when the airflow changes the transmission direction, thereby reducing part of the noise; on the other hand, since the cross-sectional area of each first air inlet channel in the pipe group body 71 is smaller than the cross-sectional area of the air inlet end head 72, the airflow entering the first air inlet channel from the air inlet end head 72 changes the flow area from a large cavity space to a small cavity space, and then changes the flow area from a small cavity space to a large cavity space when the airflow is transmitted from the first air inlet channel to the air inlet flow guide chamber 4. In the process of changing the flow area twice, the sound wave changes from compression to expansion, thereby changing and consuming the sound wave energy, which also achieves the effect of reducing noise, and the airflow is transported through multiple first air inlet channels, which is conducive to stably and uniformly supplying air to the fan, thereby reducing noise.

[0057] In the noise reduction device of the present application, the partition plate in the shell 1 can be provided in multiple forms to provide suitable airflow paths by being partitioned to form multiple partition chambers, thereby achieving good noise reduction effect. In some preferred embodiments, the partition plate divides the inner cavity of the shell 1 into multiple partition chambers, including the aforementioned air inlet flow guide chamber 4 in which the first flow guide pipe member 7 is installed, the fan installation chamber 5 which is in communication with the air inlet flow guide chamber 4, and the fan air inlet chamber 6 which is in communication with the fan installation chamber 5. After the airflow in the outside space of the shell 1 enters the air inlet flow guide chamber 4 through the first flow guide pipe member 7, it is sequentially passed through the fan installation chamber 5 and the fan air inlet chamber 6 and is sucked into the fan installed in the fan installation chamber 5, and then supplies the pressurized air outward. Thus, as shown, Figure 6 The airflow flowing through the fan installation chamber 5 can also carry away part of the heat generated by the fan during operation, thereby reducing the operating temperature of the fan.

[0058] In each of the divided chambers, in addition to the air flow passage, a plurality of air flow dead spaces can be formed so that the noise generated during the flow of the gas is continuously reflected after entering the air flow dead spaces, thereby consuming part of the energy and reducing the transmission of the noise. In order to avoid the noise reduction device occupying a large space in the height direction or the horizontal direction, which is not conducive to its arrangement in the ventilation treatment equipment, the partition plate and the divided chambers formed thereby can be optimally arranged.

[0059] In the illustrated preferred embodiment, the shell 1 is divided into a first chamber and a second chamber in the horizontal direction, wherein the second chamber is provided as the air inlet guide chamber 4, and the first chamber is divided into the fan air inlet chamber 6 close to the upper shell 11 and the fan mounting chamber 5 located below the fan air inlet chamber 6. Thus, since the air inlet guide chamber 4 is located at the same horizontal level as the fan mounting chamber 5 and the fan air inlet chamber 6, the overall height of the noise reduction device can be avoided to be too high, and the flow of the gas in the three divided chambers can prolong the air path, which can have the advantages of further reducing the noise, etc.

[0060] In the illustrated preferred embodiment, the shell 1 is divided into a first chamber and a second chamber in the horizontal direction, wherein the second chamber is provided as the air inlet guide chamber 4, and the first chamber is divided into the fan air inlet chamber 6 close to the upper shell 11 and the fan mounting chamber 5 located below the fan air inlet chamber 6. Thus, since the air inlet guide chamber 4 is located at the same horizontal level as the fan mounting chamber 5 and the fan air inlet chamber 6, the overall height of the noise reduction device can be avoided to be too high, and the flow of the gas in the three divided chambers can prolong the air path, which can have the advantages of further reducing the noise, etc.

[0061] Specifically, the horizontal partition plate 2 (e.g. at the position of the second air vent 21) can be provided with a second flow guide pipe member that connects the fan installation chamber 5 and the fan air inlet chamber 6, which can have one or more second air inlet channels, and the outside of the second flow guide pipe member is provided with a sound absorbing member, which at least includes a second cladding member provided with sound absorbing material (e.g. sound absorbing cotton), and the two side walls of the second cladding member are in contact with the outer side wall of the second flow guide pipe member and the inner side wall of the fan installation chamber 5 and / or the fan air inlet chamber 6 respectively, so that the two side walls of the second cladding member are isolated from the airflow in the fan installation chamber 5 or the fan air inlet chamber 6. Thus, as with the first cladding member 8 described above, this arrangement can use the second cladding member to absorb the sound wave energy generated by the airflow from the fan installation chamber 5 to the fan air inlet chamber 6, reducing the generation and transmission of noise, and also effectively preventing the particles that can exist in the second cladding member from coming into contact with the airflow from the fan installation chamber 5 to the fan air inlet chamber 6, thereby reducing the risk of these particles being supplied to the patient along with the airflow.

[0062] Further, the inner side wall of the fan installation chamber 5 and the fan air inlet chamber 6 or the outer side wall of the second flow guide pipe member can be formed with a second support boss corresponding to the end face of the second cladding member, and the end face of the second cladding member is in contact with the surface of the second support boss, so that the end face of the second cladding member is isolated from the airflow in the fan installation chamber 5 or the fan air inlet chamber 6, which can prevent the airflow in the fan installation chamber 5 or the fan air inlet chamber 6 from coming into contact with the end face of the second cladding member, further reducing the risk of particles in the second cladding member being mixed into the airflow and being supplied to the patient along with the airflow.

[0063] The aforementioned horizontal partition plate 2 and vertical partition plate 3 can be provided as a separate component from the housing 1 or integrally formed with the housing 1. In order to facilitate disassembly and maintenance, as mentioned above, the housing 1 can include an upper housing 11 and a lower housing 12, and the upper housing 11 is connected to the upper end opening of the lower housing 12 by snap fitting. The air inlet 12a can be formed on the lower housing 12, and the lower housing 12 can also be formed with an air outlet 12b for discharging the airflow from the housing 1. In a preferred embodiment, the horizontal partition plate 2 is installed between the upper housing 11 and the lower housing 12, and the air inlet 12a and the air outlet 12b are formed on the lower housing 12. Thus, during assembly, the first flow guide pipe member 7 with the outer cladding of sound absorbing cotton and the fan housing 9 (to be described later) with the fan installed therein can be positioned and installed on the horizontal partition plate 2 first, then the horizontal partition plate 2 is capped on the upper end of the lower housing 12, so that the first flow guide pipe member 7 and the ports of the fan are in sealed contact with the corresponding air inlets 12a and air outlets 12b on the lower housing 12 respectively, and finally the upper housing 11 is connected to the upper side of the lower housing 12.

[0064] Figure 4The internal structure of the upper shell 11 in a preferred embodiment is shown. The inner side of the upper shell 11 (i.e. the side facing the lower shell 12) can be formed with a plurality of arc-shaped flow guide ribs 11a extending towards the horizontal partition plate 2 and distributed in the circumferential direction and spaced apart from each other. One or more groups of arc-shaped flow guide ribs 11a can be provided. In combination with the second air passage 21 connecting the fan installation chamber 5 to the fan air inlet chamber 6, the arc-shaped flow guide ribs 11a can guide the airflow entering the fan air inlet chamber 6 from the fan installation chamber 5 to flow in the circumferential direction and be dispersed into a plurality of airflow streams, which then flow towards the fan installation chamber 5 (i.e. towards the third air passage 24) and are then supplied to the air inlet of the fan installed in the fan installation chamber 5. The arc-shaped flow guide ribs 11a can guide the airflow to flow smoothly into the air inlet of the fan, thereby reducing the airflow noise at the air inlet of the fan. Furthermore, the plurality of arc-shaped flow guide ribs 11a can separate the airflow into a plurality of airflow streams, thereby reducing the air resistance at the air inlet of the fan and further reducing the noise of airflow transmission. Figure 2 and Figure 5 In a preferred embodiment of the noise reduction device, the fan installed in the fan installation chamber 5 has an air inlet 51. In addition to the second air passage 21 connecting the fan installation chamber 5 to the fan air inlet chamber 6, a third air passage 24 is provided on the horizontal partition plate 2 corresponding to the air inlet 51 of the fan, and the air inlet 51 of the fan is in sealed communication with the fan air inlet chamber 6 through the third air passage 24. Thus, when the airflow enters the fan air inlet chamber 6 from the fan installation chamber 5, at least part of the airflow can be guided by the arc-shaped flow guide ribs 11a to flow in the circumferential direction and be dispersed into a plurality of airflow streams, which then flow towards the fan installation chamber 5 (i.e. towards the third air passage 24) and are then supplied to the air inlet 51 of the fan installed in the fan installation chamber 5. The arc-shaped flow guide ribs 11a can guide the airflow to flow smoothly into the air inlet 51 of the fan, thereby reducing the airflow noise at the air inlet of the fan. Furthermore, the plurality of arc-shaped flow guide ribs 11a can separate the airflow into a plurality of airflow streams, thereby reducing the air resistance at the air inlet of the fan and further reducing the noise of airflow transmission.

[0065] Further, at the position corresponding to the third air passage 24, the horizontal partition plate 2 can further be formed with a flow guide protrusion 22 protruding towards the fan air inlet chamber 6. The circumferential wall of the flow guide protrusion 22 is formed with a plurality of flow guide openings 22a in communication with the third air passage 24. The airflow in the fan air inlet chamber 6 flows into the air inlet 51 of the fan installed in the fan installation chamber 5 through the flow guide openings 22a and the third air passage 24 in sequence, so that the airflow in the fan air inlet chamber 6 is uniformly supplied to the fan. By forming a plurality of circumferentially distributed flow guide openings 22a upstream of the fan air inlet, the airflow can be further guided to be stably and uniformly supplied to the fan, thereby reducing the working noise of the fan. In addition, the inner side of the top wall of the flow guide protrusion 22 can be formed with a flow guide cone 22b extending towards the fan installation chamber 5. The horizontal cross-section of the flow guide cone 22b decreases in the direction towards the fan, which can guide the airflow to enter the fan shell 9 as described later from the fan air inlet chamber 6, thereby avoiding the formation of turbulence above it and reducing the generation of noise.

[0066] Typically, a fan shell 9 for mounting the fan can be arranged in the fan mounting chamber 5, which is usually made of soft material such as soft glue or silica gel, so as to effectively absorb the mechanical energy generated by vibration during operation of the fan and reduce noise transmission. In the case where the horizontal partition plate 2 is provided with the aforementioned flow guide protrusion 22, the fan shell 9 can be mounted with its inlet aligned with the flow guide protrusion 22, wherein the inlet of the fan shell 9 corresponds to the air inlet 51 of the fan mounted therein, so as to stably supply air to the fan under the guidance of the flow guide protrusion 22. In the position around the inlet of the fan shell 9, the fan shell 9 can be formed with an annular protrusion 91 that is in close contact with the bottom surface of the horizontal partition plate 2, so that the inlet of the fan shell 9 and the air inlet 51 of the fan are in sealed communication with the fan air inlet chamber 6 through the flow guide opening 22a on the flow guide protrusion 22, and the airflow in the fan air inlet chamber 6 only enters the air inlet 51 of the fan through the third air vent 24, but does not enter other areas in the fan mounting chamber 5 except the air inlet 51 through the third air vent 24, thereby ensuring the airflow tightness of the air inlet end of the fan and ensuring the working efficiency of the fan. The fan shell 9 can be mounted in the fan mounting chamber 5 in various suitable ways, wherein the horizontal partition plate 2 can be formed with a plurality of fan shell connecting grooves 23 distributed around the flow guide protrusion 22, so that the upper end of the fan shell 9 is connected to the horizontal partition plate 2 through the fan shell connecting grooves 23. In addition, the fan mounted in the fan shell 9 can also have an air outlet that is in communication with the air outlet 12b on the shell 1 to output pressurized airflow outward.

[0067] Figure 7 A partial enlarged structure of a noise reduction device according to another preferred embodiment of the present application is shown, which can be combined with the foregoing Figures 1 to 6 The preferred embodiments have substantially the same structure, and here the differences will be mainly described.

[0068] As Figure 7 shown, the shell 1 of the noise reduction device has an inner shell layer 1a and an outer shell layer 1b, and a sealed chamber 1c is defined between the inner shell layer 1a and the outer shell layer 1b. The sealed chamber 1c can form a vacuum space by vacuum compression or the like, or can be filled with a first covering member such as polyester fiber sound-absorbing cotton, sponge, etc., so as to further block the noise in the shell 1 from being transmitted outward, improving the user experience. In this case, the shell 1 does not need to be designed with a complex airflow path and noise reduction structure, and the noise absorption and blocking effect is better than that of a single-layer shell.

[0069] In addition, the utility model still provides a ventilation therapy equipment with above -mentioned noise reduction device, wherein, its noise reduction device's casing is installed with fan, like through preceding and following fan casing 9 install in fan installation chamber 5. Through the noise reduction device provided by the utility model, the ventilation therapy equipment can supply clean breathing gas to the patient with lower noise, and has the advantages of high safety, good use experience and the like.

[0070] The preferred embodiments of the utility model are described in detail above in combination with the drawings, but the utility model is not limited to this. Within the technical concept range of the utility model, the technical scheme of the utility model can be subjected to various simple modifications, including the combination of various specific technical features in any suitable manner. In order to avoid unnecessary repetition, the utility model will not further describe various possible combination manners. However, these simple modifications and combinations should also be regarded as the disclosed content of the utility model and belong to the protection range of the utility model.

Claims

1. A noise reduction device, characterized by, The shell (1) is provided with an airflow passage for transmitting airflow in the shell (1), and the airflow passage is externally provided with an acoustic absorption member comprising acoustic absorption material, and the acoustic absorption member is arranged to be isolated from the airflow in the shell (1). Each surface of the acoustic absorption member is arranged to be in contact with the corresponding adjacent surface in the shell (1) to be isolated from the airflow in the shell (1).

2. The noise reducing device of claim 1, wherein, The acoustic absorption member is wrapped outside the airflow passage; one side wall of the acoustic absorption member is in contact with the outer side wall of the airflow passage, and the other side wall is in contact with the inner side wall of the shell (1) or the corresponding adjacent surface in the shell (1) to isolate the airflow in the shell (1).

3. The noise reducing device of claim 2, wherein, An end surface of the acoustic absorption member is formed with a support structure in the shell (1), and the end surface of the acoustic absorption member is in contact with the surface of the support structure, so that the end surface of the acoustic absorption member is isolated from the airflow in the shell (1).

4. The noise reducing device of claim 2 or 3, wherein, A plurality of separated chambers are formed in the shell (1); at least one of the separated chambers is provided with the airflow passage for transmitting airflow, and / or the airflow passage is provided between two of the separated chambers for communicating the two separated chambers.

5. The noise reducing device of claim 2, wherein, The plurality of separated chambers comprises an air inlet guide chamber (4), a fan mounting chamber (5) in communication with the air inlet guide chamber (4), and a fan air inlet chamber (6) in communication with the fan mounting chamber (5); the airflow from the external space of the shell (1) sequentially passes through the air inlet guide chamber (4), the fan mounting chamber (5) and the fan air inlet chamber (6) to enter the fan mounted in the fan mounting chamber (5).

6. The noise reducing device of claim 5, wherein, The air inlet guide chamber (4) is provided with the airflow passage, which is arranged as a first guide pipe member (7), and the air inlet guide chamber (4) is in communication with the external space of the shell (1) through the first guide pipe member (7).

7. The noise reducing device of claim 6, wherein, The first guide pipe member (7) is wrapped outside the acoustic absorption member, and the acoustic absorption member is arranged as a first wrapping member (8), and the two side walls of the first wrapping member (8) are respectively in corresponding contact with the outer side wall of the first guide pipe member (7) and the inner side wall of the air inlet guide chamber (4), so that the two side walls of the first wrapping member (8) are isolated from the airflow in the air inlet guide chamber (4). The end surface of the first wrapping member (8) is formed with a first support boss (4a) on the inner side wall of the air inlet guide chamber (4) or the outer side wall of the first guide pipe member (7), and the end surface of the first wrapping member (8) is in contact with the surface of the first support boss (4a), so that the end surface of the first wrapping member (8) is isolated from the airflow in the air inlet guide chamber (4).

8. The noise reducing device of claim 7, wherein, The air inlet guide chamber (4) has a first region (41) in the space above the first guide pipe member (7) and a second region (42) in the space below the first guide pipe member (7); the first guide pipe member (7) comprises a first outflow end (73) and a second outflow end (74).

9. The noise reducing device of claim 7, wherein, ​ The airflow in the first flow guide pipe (7) enters the first area (41) through the first outflow end (73); the first area (41) forms a dead space that limits the airflow flow; The airflow in the first flow guide pipe (7) enters the second area (42) through the second outflow end (74), and the second area (42) is in communication with the fan mounting chamber (5).

10. The noise reducing device of claim 7, wherein, The first flow guide pipe (7) comprises a pipe group body (71) and an air inlet end head (72) in communication with the pipe group body (71), wherein one or more first air inlet channels extending in a first direction are formed in the pipe group body (71), and the cross-sectional area of the first air inlet channel is smaller than that of the air inlet end head; the first cladding member (8) at least clads the outer periphery of the pipe group body (71); the air inlet end head (72) extends outward from the pipe group body (71) in a second direction that is at an angle relative to the first direction, and when the pipe group body (71) is arranged in the air inlet flow guide chamber (4), the air inlet end head (72) is in communication with the external space of the shell (1).

11. The noise reducing device of claim 6, wherein, The shell (1) comprises a lower shell (12) and an upper shell (11) that is connected to the lower shell (12) by buckling; The shell (1) is divided into a first cavity and a second cavity in the horizontal direction, wherein the second cavity is arranged as the air inlet flow guide chamber (4), and the first cavity is divided into the fan air inlet chamber (6) close to the upper shell (11) and the fan mounting chamber (5) below the fan air inlet chamber (6).

12. The noise reducing device of claim 11, wherein, The shell (1) is provided with a horizontal partition plate (2), and a second air vent (21) and a third air vent (24) are respectively arranged on the horizontal partition plate (2); The second air vent (21) is used for communication between the fan mounting chamber (5) and the fan air inlet chamber (6); a fan arranged in the fan mounting chamber (5) has an air inlet (51), and the air inlet (51) is in sealed communication with the fan air inlet chamber (6) through the third air vent (24).

13. The noise reducing device of claim 12, wherein, A flow guide protrusion (22) that protrudes towards the fan air inlet chamber (6) is arranged on the horizontal partition plate (2) corresponding to the third air vent (24), a plurality of flow guide openings (22a) in communication with the third air vent (24) are formed in the peripheral wall of the flow guide protrusion (22), and the airflow in the fan air inlet chamber (6) flows into the air inlet (51) of the fan arranged in the fan mounting chamber (5) in sequence through the flow guide openings (22a) and the third air vent (24).

14. The noise reducing device of claim 13, wherein, A flow guide cone (22b) that gradually tapers and extends towards the fan mounting chamber (5) is formed in the inner side of the top wall of the flow guide protrusion (22).

15. The noise reducing device of claim 12, wherein, The fan mounting chamber (5) is provided with a fan shell (9) for mounting the fan, the fan shell (9) is provided with an inlet corresponding to the air inlet (51) of the fan, and an annular protrusion (91) is formed around the inlet of the fan shell (9) and is in close contact with the bottom surface of the horizontal partition plate (2), so that the air inlet (51) of the fan mounted in the fan shell (9) is in sealed communication with the third air vent (24) through the annular protrusion (91).

16. The noise reducing device of claim 12, wherein, A plurality of arc-shaped flow guide ribs (11a) are formed on the inner side of the upper shell (11) in the fan air inlet chamber (6) and extend towards the horizontal partition plate (2) and are distributed circumferentially at intervals, and the plurality of flow guide ribs (11a) guide the airflow in the fan air inlet chamber (6) to flow towards the air inlet (51).

17. The noise reducing device of claim 6, wherein, The airflow passage is communicated between the fan mounting chamber (5) and the fan air inlet chamber (6), the airflow passage is provided as a second flow guide pipe, the second flow guide pipe includes one or more second air inlet passages, the second flow guide pipe is covered by the sound absorbing member, the sound absorbing member is provided as a second covering member, the two side walls of the second covering member are in corresponding contact with the outer side wall of the second flow guide pipe and the inner side wall of the fan mounting chamber (5) or the fan air inlet chamber (6) where the second covering member is located, so that the two side walls of the second covering member are isolated from the airflow in the fan mounting chamber (5) or the fan air inlet chamber (6) where the second covering member is located.

18. The noise reducing device of claim 17, wherein, Second support bosses are formed on the inner side walls of the fan mounting chamber (5) and the fan air inlet chamber (6) or the outer side wall of the second flow guide pipe corresponding to the end surface of the second covering member, the end surface of the second covering member is in contact with the surface of the second support boss, so that the end surface of the second covering member is isolated from the airflow in the fan mounting chamber (5) or the fan air inlet chamber (6) where the second covering member is located.

19. The noise reducing device of claim 1, wherein, The shell (1) has an inner shell layer (1a) and an outer shell layer (1b), a sealed chamber (1c) is formed between the inner shell layer (1a) and the outer shell layer (1b), and a vacuum space is formed in the sealed chamber (1c) or the sealed chamber (1c) is filled with sound absorbing material.

20. A ventilation therapy apparatus, characterized by, The ventilation therapy device comprises the noise reduction device according to any one of claims 1 to 19.

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