Noise reduction breathing machine

Abstract

The invention belongs to the technical field of breathing machines, and relates to a noise reduction breathing machine which comprises a shell, a noise reduction device and a noise reduction device. The micro-pore plate assembly is mounted in the accommodating cavity, and the micro-pore plate assembly forms a noise reduction cavity; the fan is mounted in the noise reduction chamber; wherein a gap is formed between the microporous plate assembly and the inner wall of the shell, and the gap forms a silencing cavity. The micropore plate assembly is combined with the silencing cavity, high-frequency noise is absorbed, noise generated by turbulent flow of airflow is reduced, and wide-frequency-band noise reduction is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of ventilators and relates to a noise reduction ventilator. Background Art

[0002] With the widespread use of ventilators in the medical field, their stability, noise level and patient comfort have gradually become core indicators. Ventilators will inevitably generate noise during long-term operation, which will not only affect the patient's sleep quality, but also may interfere with normal communication in the hospital environment.

[0003] The noise of the ventilator mainly comes from the following aspects:

[0004] 1. The airflow noise and mechanical noise of the turbine fan. The centrifugal turbine fan in the ventilator generates airflow noise when it rotates at high speed, especially the high-frequency noise caused by turbulence during the intake and exhaust process.

[0005] Mechanical noise caused by the operation of mechanical parts such as bearings and blade vibrations also accounts for an important proportion of the overall equipment noise.

[0006] 2. Turbulent noise in the airflow channel. When the ventilator delivers air to the patient through a hose or internal airflow channel, the airflow turns and diverts in the narrow pipe, generating obvious aerodynamic noise. These turbulent noises are particularly obvious and difficult to control through traditional sound insulation measures.

[0007] 3. Resonance and vibration noise. The vibration of the fan will transmit resonance noise through the equipment casing. Especially in the absence of a good shock absorption design, this vibration noise will be amplified, further deteriorating the noise level of the equipment.

[0008] At present, the noise reduction measures of traditional ventilators mainly adopt the following methods, but they all have limitations:

[0009] 1. Porous sponge materials absorb sound. Sponge materials are used to absorb high-frequency noise, but sponges are prone to aging and desquamation, which affects the long-term performance of the equipment and cannot effectively suppress low-frequency mechanical noise.

[0010] 2. Sealed soundproof cover reduces noise transmission by sealing the shell, but this design limits heat dissipation and increases the weight and volume of the equipment.

[0011] 3. Simple air duct optimization, reducing sharp turns in the air flow channel design to alleviate turbulent noise, but this method has limited control over complex noise and is complex in design.

[0012] In summary, it is difficult for existing noise reduction technologies to strike a balance between efficient noise reduction and equipment lightweighting when facing complex noise sources such as ventilators. Therefore, the noise control problem of ventilators has become a technical challenge that needs to be solved urgently. Summary of the invention

[0013] The purpose of the present invention is to provide a noise reduction ventilator to address the deficiencies of the prior art, and to reduce the noise of the ventilator through a microporous plate without affecting internal heat dissipation and air flow.

[0014] In order to achieve the above object, the present invention adopts the following technical solutions:

[0015] A noise reduction ventilator, comprising:

[0016] A housing, wherein a cavity is provided in the housing;

[0017] A microporous plate assembly, wherein the microporous plate assembly is installed in the cavity, and the microporous plate assembly constitutes a noise reduction chamber;

[0018] A fan, wherein the fan is installed in the noise reduction chamber;

[0019] There is a distance between the microporous plate assembly and the inner wall of the shell, and the distance constitutes a silencer chamber.

[0020] Furthermore, it also includes a flexible shock-absorbing sleeve, which is arranged on the surface of the fan and has hanging ears. The flexible shock-absorbing sleeve allows the fan to be suspended in the noise reduction chamber of the microporous plate assembly through the hanging ears.

[0021] Furthermore, the housing includes a base and an upper cover;

[0022] The microplate assembly includes a bottom microplate, a side microplate and a top microplate;

[0023] The bottom microporous plate and the side microporous plate are installed in the base, and the top microporous plate is installed in the upper cover;

[0024] A middle frame is provided between the side microporous plate and the top microporous plate, and the middle frame is fixed in the base;

[0025] Wherein, a positioning column is provided on the middle frame, and the hanging ear on the flexible shock-absorbing sleeve cooperates with the positioning column to suspend the fan.

[0026] Furthermore, an air outlet window is provided on the shell, and the air outlet of the fan corresponds to the air outlet window;

[0027] The flexible shock-absorbing sleeve is provided with an air outlet duct corresponding to the air outlet of the fan, and the air outlet duct extends from the cavity to the outside of the shell;

[0028] Therein, a gap is provided between the air outlet of the fan and the air outlet window, and an elastic flange for shock absorption and energy absorption is provided at the air outlet duct at the gap.

[0029] Furthermore, the fan is a centrifugal fan, and the shock-absorbing sleeve is provided with a notch corresponding to the motor and the air inlet of the fan;

[0030] The air inlet of the fan faces downward, and the motor of the fan penetrates the microporous plate assembly and the shock-absorbing sleeve and faces upward;

[0031] A shock-absorbing end cover in close contact is arranged between the motor and the shell of the fan, and a plurality of shock-absorbing protrusions abutting against the shell are arranged on the top of the end cover.

[0032] Furthermore, a first air inlet duct is provided in the cavity, the first air inlet duct connects the air inlet window of the shell and the cavity, and an outlet of the first air inlet duct is located above the cavity.

[0033] Furthermore, a grille is provided at the outlet of the first air inlet duct.

[0034] Furthermore, a second air inlet duct is provided outside the shell and is connected to the air inlet window of the shell, and the second air inlet duct is used to extend the air flow path.

[0035] Furthermore, a first microporous plate is provided at a corner in the second air inlet duct, the first microporous plate is perpendicular to the outer wall of the shell, and a silencer chamber is provided between the first microporous plate and the inner wall of the second air inlet duct.

[0036] Furthermore, a second microporous plate is provided in the second air inlet duct, the position of the second microporous plate corresponds to the position of the air inlet window of the shell, and a silencer cavity is provided between the second microporous plate and the inner wall of the second air inlet duct.

[0037] The technical solution of the present invention has the following advantages compared with the prior art:

[0038] 1. The microporous plate assembly is combined with the silencing chamber to absorb high-frequency noise and reduce the noise generated by air flow turbulence, achieving wide-band noise reduction.

[0039] 2. Use a flexible shock-absorbing sleeve to suspend the fan to effectively isolate the mechanical vibration of the fan and reduce resonance noise.

[0040] 3. The layout of the fan air inlet facing downward and the first air inlet duct outlet facing upward extends the air flow path, improves the heat dissipation effect, ensures the stable operation of the equipment, and prevents dust and foreign matter from entering.

[0041] Other features and advantages of the invention will be described in the following description, and partly become apparent from the description, or understood by practicing the invention. The purpose and other advantages of the invention can be realized and obtained by the structures particularly pointed out in the written description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The present invention is described in detail below in conjunction with the accompanying drawings to make the above advantages of the present invention more clear.

[0043] Figure 1 It is an exploded view of a noise reduction ventilator of the present invention;

[0044] Figure 2 It is a schematic diagram of a microporous plate assembly of a noise reduction ventilator of the present invention;

[0045] Figure 3 It is a schematic diagram of the partial assembly inside the base of a noise reduction ventilator of the present invention;

[0046] Figure 4 It is a partial assembly schematic diagram of a noise reduction ventilator of the present invention;

[0047] Figure 5 It is a schematic diagram of the assembly of a flexible shock absorbing set of a noise reduction ventilator of the present invention;

[0048] Figure 6 is a top view of a noise reduction ventilator of the present invention;

[0049] Figure 7 is a cross-sectional view of a noise reduction ventilator of the present invention;

[0050] Figure 8 is a schematic diagram of a noise reduction ventilator of the present invention;

[0051] Fig. 9 It is a schematic diagram of a second air inlet duct of a noise reduction ventilator of the present invention. DETAILED DESCRIPTION

[0052] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0053] In the description of the present invention, it is necessary to understand that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship described in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0054] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0055] In the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] Reference Figure 1-4 As shown, a noise reduction ventilator comprises:

[0057] A housing 100, wherein a cavity is provided in the housing 100;

[0058] A micro-porous plate assembly 200, wherein the micro-porous plate assembly 200 is installed in the cavity, and the micro-porous plate assembly 200 constitutes a noise reduction chamber;

[0059] A fan 300, wherein the fan 300 is installed in the noise reduction chamber;

[0060] Among them, a distance is provided between the microporous plate assembly 200 and the inner wall of the shell 100, and the distance constitutes a silencer chamber 400. The design of this noise reduction ventilator mainly adopts the structural combination of a quasi-circular fan 300 and a quasi-circular microporous plate assembly 200, and solves the noise problem during the operation of the equipment through a reasonably arranged silencer chamber 400. In this design, the microporous plate assembly 200 not only forms an independent noise reduction chamber, but also forms a silencer chamber 400 between the microporous plate assembly 200 and the inner wall of the shell 100, which is used to further absorb and weaken noise. The overall structure achieves a balance between noise reduction, heat dissipation, portability and air quality through modular and compact design.

[0061] The quasi-circular fan 300 is installed in the quasi-circular microporous plate assembly 200, which ensures the fit between the fan 300 and the microporous plate assembly 200, while reducing excess noise leakage. The quasi-circular design ensures the smooth flow of the internal airflow and avoids the turbulent noise generated by the airflow in the sharp corner area. The microporous plate assembly 200 and the fan 300 are wrapped together to form a noise reduction chamber for absorbing the high-frequency noise and part of the mechanical noise generated by the fan 300. The microporous plate assembly 200 and the top corner area of ​​the inner wall of the housing 100 form a surround-type silencing chamber 400. When the sound waves pass through these gaps, the sound waves are reflected and attenuated multiple times, effectively reducing the resonance noise and low-frequency noise.

[0062] The dual chamber structure of the noise reduction chamber and the silencing chamber 400 absorbs and weakens high-frequency noise and low-frequency vibration noise, achieving wide-band noise reduction. Compared with traditional sponge sound-absorbing materials, the microporous plate assembly 200 is more durable and less prone to aging, reducing the maintenance frequency of the equipment.

[0063] Reference Figure 4-5 As shown, in this embodiment, a flexible shock-absorbing sleeve 500 is also included, and the flexible shock-absorbing sleeve 500 is sleeved on the surface of the fan 300. The flexible shock-absorbing sleeve 500 is provided with a hanging ear 510, and the flexible shock-absorbing sleeve 500 allows the fan 300 to be suspended in the noise reduction chamber of the microporous plate assembly 200 through the hanging ear 510. A flexible shock-absorbing sleeve 500 is sleeved on the surface of the fan 300, and the fan 300 is suspended in the microporous plate assembly 200 through the hanging ear 510 design to reduce the transmission of mechanical vibration and prevent resonance noise. This design ensures that the fan 300 is not in direct contact with the equipment housing 100, avoiding the transmission of vibration through a hard contact path. The microporous plate assembly 200 forms a noise reduction chamber around the fan 300 to absorb high-frequency airflow noise. The silencing chamber 400 between the microporous plate assembly 200 and the housing 100 uses the air layer in the space to reduce low-frequency noise and resonance noise.

[0064] The flexible shock-absorbing sleeve 500 is in close contact with the surface of the fan 300, providing a layer of elastic vibration isolation protection for the fan 300. The hanging ear 510 on the shock-absorbing sleeve cooperates with the positioning structure on the microporous plate assembly 200, so that the fan 300 is suspended in the noise reduction chamber to avoid direct contact between the fan 300 and the housing 100. This suspension method effectively reduces the propagation of vibration and the generation of resonance noise by eliminating hard contact. The noise reduction chamber formed by the microporous plate assembly 200 around the fan 300 absorbs the high-frequency airflow noise generated when the fan 300 runs at high speed. The gap between the microporous plate assembly 200 and the housing 100 forms a silencer chamber 400, which causes the sound waves to be reflected and attenuated multiple times in this area, especially for the reduction of low-frequency mechanical noise and resonance noise.

[0065] The microporous plate assembly 200 is combined with the silencing chamber 400 to effectively absorb high-frequency airflow noise and low-frequency mechanical noise. The suspension design of the flexible shock-absorbing sleeve 500 isolates the mechanical vibration of the fan 300, avoids resonance noise, and improves the silent effect of the equipment operation.

[0066] Reference Figure 1-4 As shown, in this embodiment, the housing 100 includes a base 110 and an upper cover 120;

[0067] The microplate assembly 200 includes a bottom microplate 210, a side microplate 220, and a top microplate 230;

[0068] The bottom microporous plate 210 and the side microporous plate 220 are installed in the base 110, and the top microporous plate 230 is installed in the upper cover 120;

[0069] A middle frame 600 is provided between the side microporous plate 220 and the top microporous plate 230 , and the middle frame 600 is fixed in the base 110 ;

[0070] Among them, a positioning column 610 is provided on the middle frame 600, and the ear 510 on the flexible shock-absorbing sleeve 500 cooperates with the positioning column 610 to suspend the fan 300. This noise reduction ventilator adopts a combination design of a flexible shock-absorbing sleeve 500, a microporous plate assembly 200 and a silencing chamber 400, achieving excellent performance in noise control, shock absorption and heat dissipation. The equipment housing 100 is composed of a base 110, an upper cover 120 and a middle frame 600. The microporous plate assembly 200 includes a three-layer structure of bottom, side and top, and covers the fan 300 to form a noise reduction chamber. The gap between the microporous plate and the inner wall of the housing 100 constitutes a silencing chamber 400, which allows noise to be reflected and attenuated therein, weakening high-frequency airflow noise and low-frequency mechanical noise. The flexible shock-absorbing sleeve 500 is wrapped around the surface of the fan 300, and the fan 300 is suspended in the noise reduction chamber through the hanging ears 510 cooperating with the positioning columns 610 on the middle frame 600, so as to prevent mechanical vibration from being transmitted to the housing 100 and reduce resonance noise.

[0071] The circular-shaped fan 300 and microporous plate assembly 200 design optimizes the airflow path. The air inlet of the fan 300 faces downward, sucking air from the bottom and discharging it from the top after acceleration. This path reduces turbulent noise and ensures that the heat inside the device is dissipated in time, improving the stability of the device and the reliability of long-term operation. The modular design of the base 110, upper cover 120 and middle frame 600 makes the device easy to disassemble and maintain. Compared with traditional sponge sound-absorbing materials, the microporous plate assembly 200 is more durable and less prone to aging or desquamation, further reducing maintenance costs. The lightweight design makes the device easy to carry and suitable for a variety of medical scenarios, and the downward-facing air inlet layout prevents dust and foreign matter from entering the device, ensuring the cleanliness and air quality of the ventilator.

[0072] This design strikes a good balance between efficient noise reduction, vibration isolation, airflow management, and heat dissipation. The microporous plate assembly 200 and the silencing chamber 400 provide dual noise reduction, combined with the suspension design of the flexible shock-absorbing sleeve 500, to ensure the quietness and stability of the equipment during operation. The modular structure simplifies the maintenance process and improves the service life and convenience of the equipment. Overall, this solution provides efficient and stable noise control and reliable operation guarantee for the ventilator, improving the patient's experience and the quality of the medical environment.

[0073] Reference Figure 6-7 As shown, in this embodiment, the housing 100 is provided with an air outlet window 130, and the air outlet of the fan 300 corresponds to the air outlet window 130;

[0074] The flexible shock-absorbing sleeve 500 is provided with an air outlet duct 520 corresponding to the air outlet of the fan 300, and the air outlet duct 520 extends from the cavity to the outside of the housing 100;

[0075] Among them, a gap is provided between the air outlet of the fan 300 and the air outlet window 130, and the air outlet duct 520 at the gap is provided with an elastic flange 530 for shock absorption and energy absorption. By optimizing the airflow and shock absorption structure between the fan 300 and the housing 100, more efficient noise reduction and vibration isolation are achieved. An air outlet window 130 is provided on the housing 100 of the device, corresponding to the air outlet of the fan 300, but in order to avoid the vibration and noise problems caused by the traditional hard contact design, a gap is specially designed between the air outlet of the fan 300 and the housing 100. The surface of the fan 300 is covered with a flexible shock-absorbing sleeve 500, and the shock-absorbing sleeve is provided with an air outlet duct 520 aligned with the air outlet of the fan 300, and smoothly guides the airflow from the cavity to the outside of the housing 100. This indirect connection method ensures that the mechanical vibration of the fan 300 will not be directly transmitted to the housing 100 or the breathing duct.

[0076] The key to the design is the elastic flange 530 in the air outlet duct 520, which absorbs the impact energy and vibration in the airflow by deformation, further suppressing the propagation of mechanical vibration. Compared with the rigid connection between the air outlet of the fan 300 and the housing 100 or the breathing tube, this gap structure reduces vibration coupling and resonance. The flexible shock-absorbing sleeve 500 and the elastic flange 530 not only provide a multi-level shock-absorbing effect, but also ensure that the airflow is smoother when entering the air outlet window 130 of the housing 100, avoiding the generation of turbulence and aerodynamic noise.

[0077] This design achieves effective vibration isolation between the fan 300 and the external structure, while improving the quietness and operational stability of the equipment. Through the isolation effect of the flexible shock-absorbing sleeve 500, the mechanical vibration of the fan 300 is significantly reduced, and the elastic flange 530 further dissipates residual vibration during the deformation and energy absorption process. This airflow path optimization design also avoids the vibration amplification problem caused by traditional hard contact, making the airflow in the breathing circuit smooth and quiet. The modular design simplifies the disassembly and maintenance of the equipment, improves the reliability and durability of the system, and reduces the frequency of daily maintenance. Overall, this innovative design provides efficient and low-noise operation guarantees for the ventilator, greatly improves the patient's comfort, and is suitable for various medical and home scenarios.

[0078] In this implementation case, the fan 300 is a centrifugal fan, and the shock-absorbing sleeve is provided with a notch corresponding to the motor and the air inlet of the fan 300;

[0079] The air inlet of the fan 300 faces downward, and the motor of the fan 300 penetrates the microporous plate assembly 200 and the shock-absorbing sleeve and faces upward;

[0080] A shock-absorbing end cap 700 in close contact is provided between the motor of the fan 300 and the housing 100, and a plurality of shock-absorbing protrusions 710 abutting against the housing 100 are provided on the top of the end cap. Since the fan 300 is suspended in the micro-porous plate assembly 200, if there is no reasonable fixing structure, the equipment may produce unnecessary shaking during transportation or use, thereby affecting the stability of the equipment operation. Therefore, this design stabilizes the fan 300 through the shock-absorbing end cap 700 in close contact with the top shock-absorbing protrusion 710, while minimizing vibration transmission.

[0081] In terms of design, the shock-absorbing sleeve is provided with notches corresponding to the motor and air inlet of the fan 300, so that the motor part passes through the microporous plate assembly 200 and the shock-absorbing sleeve upward, while the air inlet of the fan 300 faces downward. Such a layout ensures that the airflow path of the fan 300 flows in an orderly manner from bottom to top, and realizes efficient cooling and heat dissipation management. In order to stabilize the motor of the fan 300, the upper part of the housing 100 is in close contact with the motor, and appropriate pressure is applied to the motor to prevent shaking. However, close contact may cause mechanical vibrations to be transmitted to the housing 100 through the contact surface, causing noise and resonance problems. In order to resolve this contradiction, the present design provides a number of shock-absorbing protrusions 710 on the top of the shock-absorbing end cover 700, which reduce the contact area through the protrusions, reduce the vibration transmission efficiency, and reduce the resonance noise.

[0082] The dual design of the shock-absorbing end cap 700 and the protrusion plays an important role in vibration isolation. The shock-absorbing end cap 700 absorbs part of the mechanical vibration from the fan 300, while the protrusion structure further suppresses the transmission of vibration energy by reducing the contact area. This double-layer shock absorption not only reduces the noise caused by vibration, but also ensures the stability of the fan 300 in the suspended state. The design of the centrifugal fan 300 with the air inlet facing downward further optimizes the airflow path, ensuring that cold air flows in from the bottom of the device and is smoothly discharged from the top window, avoiding heat accumulation and ensuring the stable operation of the equipment.

[0083] This design achieves a stable installation of the fan 300 by balancing shock absorption and fixation, while reducing vibration and resonance noise. Compared with the traditional rigid fixation method, this design provides better quietness and operation stability. The modular structure is easy to disassemble and maintain, which improves the durability and service life of the equipment and ensures efficient operation and user experience of the equipment in various medical and home scenarios.

[0084] In this embodiment, a first air inlet duct 800 is provided in the cavity, the first air inlet duct 800 connects the air inlet window of the shell 100 with the cavity, and the outlet of the first air inlet duct 800 is located above the cavity. By optimizing the airflow path and motor heat dissipation management, the stability and quietness of the equipment operation are improved. This design sets a first air inlet duct 800 in the cavity, connects the air inlet window of the shell 100 with the cavity, and arranges the outlet of the first air inlet duct 800 above the cavity. This airflow path runs through the cavity from top to bottom and finally enters the fan 300, bringing a series of noise reduction and heat dissipation optimization effects.

[0085] The design idea is to extend the airflow path, reduce airflow noise, and optimize motor heat dissipation. When the airflow passes through the cavity from top to bottom, the turbulent noise is effectively reduced due to the extension of the path and the natural flow of air. In addition, this airflow entering from the top will take away the heat generated during operation when passing through the area where the motor is located, avoiding heat accumulation in the cavity and ensuring that the device can maintain a stable temperature during long-term use.

[0086] In this layout, the motor of the fan 300 is located at the top of the cavity, and the air inlet of the fan 300 faces downward. This design not only ensures that cold air flows in from above and is discharged smoothly through the fan 300, but also enables the airflow to be effectively cooled when passing through the motor, thereby improving the working efficiency and service life of the motor. By extending the airflow path, the flow rate of the airflow is smoothly adjusted, avoiding aerodynamic noise caused by turbulence and sudden changes in airflow. In addition, the top-down airflow layout reduces the possibility of dust and particles in the air entering the key components of the equipment, further improving the durability and stability of the equipment.

[0087] The advantage of this design is that it achieves a balance between airflow path optimization, noise control, and heat dissipation management. Compared with the traditional direct air intake layout, this design reduces noise by extending the airflow path, while using the airflow to naturally cool the motor, avoiding performance degradation caused by heat accumulation. In addition, the modular air intake duct and cavity layout design simplifies the maintenance and cleaning of the equipment, and improves the reliability and service life of the equipment. This optimization solution is particularly suitable for ventilator equipment that needs to run for a long time, ensuring that while improving the quietness effect, the equipment maintains efficient heat dissipation and stable operation, providing users with a quieter and more comfortable use experience.

[0088] Reference Figure 7-9 As shown, in this embodiment, a grille 810 is provided at the outlet of the first air intake duct 800. The main design idea of ​​the vertical-striped grille 810 is to reduce airflow turbulence and optimize the stability of the airflow. The vertical-striped grille 810 is provided at the outlet of the air intake duct so that the airflow entering the cavity can be smoothly transitioned, effectively reducing turbulence and the noise generated by the airflow during the intake process. The vertical structure of the grille 810 guides the airflow to be evenly distributed, minimizing the turbulence and noise that may be generated by the turning of the airflow. This design significantly reduces the propagation of aerodynamic noise when the equipment is running, and improves the overall quiet effect.

[0089] In addition, this layout introduces cold air into the cavity from top to bottom and flows through the fan 300 motor located at the top of the cavity, helping to quickly remove the heat generated by the motor during operation and avoid the impact of heat accumulation on equipment performance. The airflow becomes smoother after passing through the grille 810, thereby ensuring that the fan 300 can efficiently inhale cold air and further reduce turbulent noise. Compared with straight-through air intake, this design with grille 810 achieves the dual effects of airflow regulation and cooling and heat dissipation, extending the airflow path, making the operation of the fan 300 quieter and smoother.

[0090] In this embodiment, the shell 100 is provided with a second air inlet duct 900 connected to the air inlet window of the shell 100, and the second air inlet duct 900 is used to extend the airflow path. By providing the second air inlet duct 900 outside the shell 100, the dual functions of extending the airflow path and controlling noise are achieved. The second air inlet duct 900 is connected to the air inlet window of the shell 100, so that the air passes through the external air duct before entering the device, and then enters the internal first air inlet duct 800 and the cavity. This design not only extends the airflow path and reduces the turbulent noise caused by sudden changes in airflow, but also cleverly covers the air inlet window, effectively reducing the risk of noise leakage.

[0091] The air intake window of the housing 100 is an important channel for airflow to enter and exit the device, but it is also a potential loophole for noise leakage. In order to prevent the noise generated by the operation of the fan 300 from being directly transmitted to the external environment through the air intake window, the second air intake duct 900 covers the air intake window through structural extension, so that the noise is suppressed during the transmission process. In addition, the extended airflow path allows the air to undergo a longer diversion process before entering the device, reducing sudden changes and turbulence in the airflow, and further reducing the generation of aerodynamic noise.

[0092] The working principle of this design is to reduce noise transmission through physical extension and acoustic isolation. The path of the airflow through the second air inlet duct 900 becomes longer, which not only makes the airflow speed gentle, but also reduces the formation of turbulent noise when the fan 300 runs at high speed. Due to the covering effect of the air duct, the noise needs to go through a more complex path to be leaked, and the energy gradually decays in this process, further improving the silent effect of the equipment.

[0093] In this embodiment, a first microporous plate 910 is provided at the corner of the second air inlet duct 900, the first microporous plate 910 is perpendicular to the outer wall of the housing 100, and a muffler chamber 400 is provided between the first microporous plate 910 and the inner wall of the second air inlet duct 900. By providing the first microporous plate 910 at the corner of the second air inlet duct 900, the turbulence and noise problems that may be generated during the airflow turning process are effectively solved. The core idea of ​​this structural design is to reduce the airflow turbulence at the turning point of the air duct by combining physical diversion with acoustic absorption, reduce the noise generation and optimize the mute effect of the equipment.

[0094] When air enters the second air inlet duct 900 and encounters a corner structure, the direction of the airflow changes, which easily forms turbulence and disorder, thereby generating aerodynamic noise. In order to solve this problem, a first microporous plate 910 is provided at the corner so that the airflow can be smoothly adjusted when turning. The first microporous plate 910 is installed vertically to the outer wall of the housing 100, and forms a silencer chamber 400 with the inner wall of the second air inlet duct 900. When the airflow passes through the microporous plate, part of the sound energy and the impact force of the airflow are absorbed and attenuated, and the sound waves entering the silencer chamber 400 are further consumed after multiple reflections, thereby achieving a significant noise reduction effect.

[0095] This arrangement of microporous plates not only makes the airflow smoother when turning, reduces turbulent noise at sharp turns, but also absorbs high-frequency noise through the porous structure. The existence of the silencing chamber 400 further optimizes the attenuation process of sound waves, allowing the equipment to maintain a low noise level even when running at high speeds. This design cleverly combines airflow path optimization with noise control to achieve overall noise reduction of the fan 300 intake system.

[0096] In this embodiment, a second microporous plate 920 is provided in the second air inlet duct 900, and the position of the second microporous plate 920 corresponds to the position of the air inlet window of the housing 100, and a silencer cavity is provided between the second microporous plate 920 and the inner wall of the second air inlet duct 900. By arranging the second microporous plate 920 at the position of the air inlet window in the second air inlet duct 900, noise control is further optimized, especially reducing the noise leakage at the air inlet window. Since the air inlet window is one of the main channels for air flow in and out, if it is not effectively isolated and processed, the noise generated by the fan 300 inside the equipment can easily spread to the external environment through the air inlet window. In order to solve this problem, the second microporous plate 920 is installed at the position corresponding to the air inlet window in the second air inlet duct 900, and a silencer cavity is formed between the microporous plate and the inner wall of the duct to absorb and reduce noise to the maximum extent.

[0097] The main function of the second microporous plate 920 is to physically intercept and absorb the noise leaking from the air intake window. When the airflow enters the second air intake duct 900, it passes through the pores of the second microporous plate 920, and some sound waves are absorbed and reduced by the structure of the microporous plate, while the sound waves that are not completely absorbed enter the silencing chamber 400 between the microporous plate and the inner wall of the duct. In the silencing chamber, the sound waves are further attenuated through multiple reflections and interferences, thereby effectively reducing the propagation of noise to the outside. This design can ensure unimpeded airflow and reduce noise levels, providing excellent silencing effect for the equipment.

[0098] In summary, the design of this ventilator revolves around the core goal of noise reduction. By controlling the noise source, isolating the noise transmission path, applying the acoustic absorption structure, and optimizing the airflow management, it achieves efficient noise reduction and stable operation of the equipment. The technical solution is designed and optimized from multiple angles to build a comprehensive noise reduction system. The innovations are as follows:

[0099] By using a centrifugal fan, the air inlet of the fan 300 is facing downward and the motor is facing upward through the microporous plate assembly 200, which effectively avoids the resonance noise caused by mechanical vibration and heat accumulation. At the same time, a smooth airflow path is designed between the air inlet and the air outlet to ensure smooth airflow and reduce the aerodynamic noise generated when the fan 300 runs at high speed.

[0100] The flexible shock-absorbing sleeve 500 covers the surface of the fan 300, and uses elastic materials to isolate the mechanical contact between the fan 300 and the device housing 100 to prevent the transmission of vibration and noise. At the same time, the bending part and the elastic flange 530 in the air outlet duct 520 absorb and attenuate the vibration of the fan 300 during operation through energy absorption design, preventing the mechanical vibration from being transmitted to the housing 100 or the breathing tube along the air duct.

[0101] A first microporous plate 910 is arranged at the corner of the second air inlet duct 900 to reduce the turbulence and turbulent noise when the airflow turns. The silencing chamber 400 between the microporous plate and the inner wall of the air duct effectively absorbs high-frequency sound waves. A second microporous plate 920 is arranged at the position corresponding to the air inlet window to block the leakage of internal noise, thereby achieving multi-layer noise reduction between the air duct and the housing 100.

[0102] The vertical grille 810 guides the airflow smoothly and reduces turbulent noise at sharp turns. The first air intake duct 800 extends the airflow path, guiding air from top to bottom through the motor to remove heat and prevent heat accumulation from affecting device performance. The external second air intake duct 900 further extends the air intake path and covers the air intake window, which not only optimizes the airflow but also prevents noise from leaking out through the air intake window.

[0103] This ventilator adopts a multi-level technical solution from noise source control to transmission path isolation to acoustic absorption, and achieves a comprehensive noise reduction effect through ingenious structural design. Each part of the structure has been carefully optimized, which not only reduces aerodynamic noise and mechanical vibration noise, but also effectively avoids the risk of noise leakage through the air intake window and air duct. The modular design further improves the convenience of installation and maintenance of the equipment, ensuring the long-term reliability and durability of the equipment. This technical solution not only meets the requirements for efficient noise reduction and stable performance, but also improves the silent experience and operating efficiency of the equipment. Compared with traditional ventilators, this solution has significant technical advantages in noise reduction, airflow management, vibration isolation and heat dissipation. It is an innovative and practical noise reduction solution suitable for various medical scenarios and home use occasions. Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned embodiments, or to replace some of the technical features therein with equivalents. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A noise reduction ventilator, characterized in that: include: A housing (100), wherein a cavity is provided in the housing (100); A microporous plate assembly (200), wherein the microporous plate assembly (200) is installed in the cavity, and the microporous plate assembly (200) constitutes a noise reduction chamber; A fan (300), wherein the fan (300) is installed in the noise reduction chamber; There is a distance between the microporous plate assembly (200) and the inner wall of the housing (100), and the distance forms a silencer chamber (400).

2. The ventilator according to claim 1, characterized in that: The invention also comprises a flexible shock-absorbing sleeve (500), wherein the flexible shock-absorbing sleeve (500) is sleeved on the surface of the fan (300), and a hanging ear (510) is provided on the flexible shock-absorbing sleeve (500). The flexible shock-absorbing sleeve (500) allows the fan (300) to be suspended in the noise reduction chamber of the microporous plate assembly (200) through the hanging ear (510).

3. The ventilator according to claim 2, characterized in that: The housing (100) comprises a base (110) and an upper cover (120); The microporous plate assembly (200) comprises a bottom microporous plate (210), a side microporous plate (220) and a top microporous plate (230); The bottom microporous plate (210) and the side microporous plate (220) are installed in the base (110), and the top microporous plate (230) is installed in the upper cover (120); A middle frame (600) is provided between the side microporous plate (220) and the top microporous plate (230), and the middle frame (600) is fixed inside the base (110); Wherein, a positioning column (610) is provided on the middle frame (600), and the hanging ear (510) on the flexible shock-absorbing sleeve (500) cooperates with the positioning column (610) to suspend the fan (300).

4. The ventilator according to claim 2, characterized in that: The housing (100) is provided with an air outlet window (130), and the air outlet of the fan (300) corresponds to the air outlet window (130); The flexible shock-absorbing sleeve (500) is provided with an air outlet duct (520) corresponding to the air outlet of the fan (300), and the air outlet duct (520) extends from the cavity to the outside of the shell (100); A gap is provided between the air outlet of the fan (300) and the air outlet window (130), and an elastic flange (530) for shock absorption and energy absorption is provided at the air outlet duct (520) at the gap.

5. The ventilator according to claim 2, characterized in that: The fan (300) is a centrifugal fan, and the shock-absorbing sleeve is provided with a notch corresponding to the motor and the air inlet of the fan (300); The air inlet of the fan (300) faces downward, and the motor of the fan (300) penetrates the microporous plate assembly (200) and the shock-absorbing sleeve and faces upward; A shock-absorbing end cover (700) in close contact is provided between the motor of the fan (300) and the housing (100), and a plurality of shock-absorbing protrusions (710) abutting against the housing (100) are provided at the top end of the end cover.

6. The ventilator according to claim 5, characterized in that: A first air inlet duct (800) is provided in the cavity, the first air inlet duct (800) is connected to the air inlet window of the shell (100) and the cavity, and the outlet of the first air inlet duct (800) is located above the cavity.

7. The ventilator according to claim 6, characterized in that: A grille (810) is provided at the outlet of the first air inlet duct (800).

8. The ventilator according to claim 6, characterized in that: A second air inlet duct (900) is provided outside the shell (100) and is communicated with an air inlet window of the shell (100), and the second air inlet duct (900) is used to extend the air flow path.

9. The ventilator according to claim 8, characterized in that A first microporous plate (910) is provided at a corner in the second air inlet duct (900), the first microporous plate (910) is perpendicular to the outer wall of the shell (100), and a silencer chamber (400) is provided between the first microporous plate (910) and the inner wall of the second air inlet duct (900).

10. The ventilator according to claim 8, characterized in that: A second microporous plate (920) is provided in the second air intake duct (900), the position of the second microporous plate (920) corresponds to the position of the air intake window of the shell (100), and a silencer chamber (400) is provided between the second microporous plate (920) and the inner wall of the second air intake duct (900).

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