Blower assembly and ventilator having same

Abstract

A fan assembly and a breathing machine with the same, the fan assembly comprising a fan and a housing, the fan having an air inlet, the housing having an air inlet opening and an air inlet channel connecting the air inlet opening and the air inlet, the air inlet channel comprising a first channel, a second channel and a third channel in sequence, the air inlet being exposed in the first channel, the air inlet opening being exposed in the third channel, the housing further having a first throttling opening exposed towards the first channel and the second channel and a second throttling opening exposed towards the second channel and the third channel, air flow in the first throttling opening and the second throttling opening being towards different directions respectively; the first throttling opening and the second throttling opening being connected by sudden contraction between the first channel and the second channel and between the second channel and the third channel, so that the acoustic impedance in the air inlet channel changes suddenly, realizing noise elimination for specific frequency, thus eliminating the need for using noise elimination material, ensuring the safety of user.

Description

Fan assembly and ventilator containing it Technical Field

[0001] This invention relates to the field of medical devices, and more particularly to a fan assembly and a ventilator having the same. Background Technology

[0002] A ventilator, a medical device that can replace or assist patients in completing mechanical ventilation, improves respiratory function, reduces the work of breathing, and conserves cardiac reserve. It is primarily used in homes, sleep therapy centers, and some clinics and hospitals. A typical ventilator consists of a fan assembly and a water tank assembly. The fan assembly drives the airflow to the water tank assembly, where it mixes with the water vapor produced by the water tank assembly and is delivered to the mask worn by the patient.

[0003] The high-speed rotating fan within the ventilator assembly is the gas source for the ventilator. During operation, the fan generates significant aerodynamic noise, which, through airflow conduction and sound radiation, directly impacts the patient's experience. To reduce noise leakage through the airway, existing ventilator assemblies typically incorporate sound-absorbing materials, such as sound-absorbing cotton, within the airway. However, these materials can release harmful substances or degrade during use. If these harmful substances are inhaled through the airway, they compromise the user's safety. Summary of the Invention

[0004] The purpose of this invention is to provide a fan assembly with high safety and a ventilator having the same.

[0005] To achieve one of the above-mentioned objectives, one embodiment of the present invention provides a fan assembly, comprising:

[0006] The fan has an air inlet;

[0007] The housing has an air inlet and an air intake duct that connects the air inlet and the air intake.

[0008] The air intake duct includes a first air duct, a second air duct, and a third air duct connected in sequence. The air inlet is exposed in the first air duct, and the air inlet is exposed in the third air duct. The housing also has a first throttling orifice exposed toward the first air duct and the second air duct, and a second throttling orifice exposed toward the second air duct and the third air duct. The airflow in the first throttling orifice and the second throttling orifice are respectively directed in different directions.

[0009] As a further improvement of one embodiment of the present invention, the fan assembly further includes a first partition disposed in a first air duct and a second partition disposed in a second air duct. Both the first partition and the second partition are provided with a plurality of air vents. A first resonant cavity is formed between the first partition and the housing, and a second resonant cavity is formed between the second partition and the housing.

[0010] As a further improvement of one embodiment of the present invention, the fan assembly further includes a third partition disposed in the third air passage, the third partition dividing the third air passage into a first chamber and a second chamber, the third partition being provided with a plurality of air guide holes connecting the first chamber and the second chamber, the second throttling port being exposed in the first chamber, and the air inlet being connected to the second chamber.

[0011] As a further improvement of one embodiment of the present invention, the fan assembly further includes an air inlet pipe disposed in the second cavity. The air inlet pipe has a fixed end that is connected to the air inlet and a free end that is away from the fixed end. The free end is spaced apart from the inner wall of the housing.

[0012] As a further improvement of one embodiment of the present invention, the fan assembly further includes a mounting member connecting the fan and the housing, wherein the first air passage and the third air passage are formed on opposite sides of the mounting member, and the second air passage is located on the same side of the first air passage and the third air passage.

[0013] As a further improvement of one embodiment of the present invention, the first resonant cavity is located on the side of the first air duct away from the fan, and the second resonant cavity is located on the side of the second air duct away from the fan.

[0014] As a further improvement of one embodiment of the present invention, the first partition has a first flat plate portion forming a plurality of vent holes, the first flat plate portion being directly opposite the air inlet, and the second partition has a second flat plate portion forming a plurality of vent holes, the plane of the second flat plate portion being perpendicular to the plane of the first flat plate portion.

[0015] As a further improvement of one embodiment of the present invention, the fan abuts against the inner wall of the mounting component and is at least partially exposed within the third air passage.

[0016] As a further improvement of one embodiment of the present invention, the housing also has a first pressure-collecting port and a second pressure-collecting port connected to the air intake passage, the first pressure-collecting port being connected to the first air passage, the second pressure-collecting port being connected to the third air passage, and the first pressure-collecting port and the second pressure-collecting port being located on the same side of the housing.

[0017] To achieve the objectives of the invention described above, the present invention also provides a ventilator, which includes the fan assembly as described above.

[0018] Compared with the prior art, in the embodiments of the present invention, the first air passage and the second air passage are connected by a sudden contraction of the first throttle orifice, and the second air passage and the third air passage are connected by a sudden contraction of the second throttle orifice, so that the acoustic impedance in the intake air passage changes suddenly, thereby achieving the silencing of noise at a specific frequency, thus eliminating the need for silencing materials and ensuring the safety of users during use. Attached Figure Description

[0019] Figure 1 is a perspective view of the fan assembly in a preferred embodiment of the present invention;

[0020] Figure 2 is a cross-sectional view at point AA in Figure 1;

[0021] Figure 3 is an exploded view of the wind turbine components in Figure 1. Detailed Implementation

[0022] The present invention will now be described in detail with reference to the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional modifications made by those skilled in the art based on these embodiments are included within the scope of protection of the present invention.

[0023] It should be understood that terms such as "upper," "lower," "outer," and "inner," used herein to indicate spatial relative position, are for illustrative purposes to describe the relationship of one unit or feature relative to another unit or feature as shown in the accompanying drawings. The terms "spatial relative position" may be intended to include different orientations of the equipment in use or operation other than those shown in the figures.

[0024] Furthermore, it should be understood that although the terms "first," "second," etc., can be used herein to describe various elements or structures, the objects being described should not be limited by these terms. These terms are only used to distinguish these objects from one another. For example, a first orifice can be called a second orifice, and similarly, a second orifice can be called a first orifice, without departing from the scope of protection of this application.

[0025] Referring to Figures 1 to 3, a preferred embodiment of the present invention provides a fan assembly for use in a home ventilator, typically used in conjunction with a water tank assembly. The fan assembly drives airflow toward the water tank assembly, where it mixes with water vapor generated by the water tank assembly and is delivered to the user's mask. Furthermore, since this ventilator is primarily used to treat snoring and sleep apnea syndrome, a high degree of quiet operation is required.

[0026] Specifically, referring to Figures 1 and 2, a fan assembly includes a fan 10 and a housing 20. In this embodiment, the fan 10 is connected to the housing 20 and is mounted on a ventilator using the housing 20.

[0027] Specifically, the fan 10 has an air inlet 11, and the housing 20 has an air inlet 21 and an air intake duct connecting the air inlet 21 and the air inlet 11. In this embodiment, the fan also has an exhaust port. Air from outside the housing 20 enters the air intake duct through the air inlet 21, flows through the air intake duct to the air inlet 11, then enters the fan 10 through the air inlet 11, and finally exits the fan 10 through the exhaust port. Therefore, the noise generated by the fan 10 escapes from the fan assembly in the opposite direction to the airflow, i.e., through the air intake duct.

[0028] Specifically, the air intake duct includes a first air duct 221, a second air duct 222, and a third air duct 223 connected in sequence. The air inlet 11 is exposed within the first air duct 221, and the air inlet 21 is exposed within the third air duct 223. In this embodiment, some of the noise generated by the fan 10 passes through the first air duct 221, the second air duct 222, and the third air duct 223 in sequence, and finally escapes from the housing 20 through the air inlet 21.

[0029] Furthermore, the housing 20 also has a first throttling orifice 23 exposed to the first air passage 221 and the second air passage 222, and a second throttling orifice 24 exposed to the second air passage 222 and the third air passage 223. In this embodiment, the first throttling orifice 23 and the second throttling orifice 24 achieve throttling by changing the cross-sectional area of ​​the gas passage in the intake air passage, that is, reducing the amount of gas passing through. Therefore, the first throttling orifice 23 forms a first expansion cavity silencing structure at the connection between the first air passage 221 and the second air passage 222. That is, when a sound wave enters the next cavity from the previous cavity, due to the sudden change in acoustic impedance, part of the sound wave is reflected back. When the reflected sound wave is exactly equal in magnitude and opposite in direction to the original sound wave, it interferes and cancels out the original sound wave, thereby achieving the silencing of noise at a specific frequency. Similarly, the second throttling orifice 24 also forms a second expansion cavity silencing structure at the connection between the second air passage 222 and the third air passage 223.

[0030] Furthermore, the airflow within the first throttling orifice 23 and the second throttling orifice 24 is directed in different directions. In this embodiment, since both the first throttling orifice 23 and the second throttling orifice 24 are connected to the second air passage 222, and the airflow directions within the first throttling orifice 23 and the second throttling orifice 24 are different, the airflow directions flowing into and out of the second air passage 222 are different. This increases the time that the fan noise remains in the second air passage 222 when it dissipates outward through the intake air passage, thereby increasing the time that the noise is silenced at the two expansion chamber silencing structures and improving the noise reduction effect.

[0031] The first airway 221 and the second airway 222 are connected by a suddenly constricted first throttle orifice 23, and the second airway 222 and the third airway 223 are connected by a suddenly constricted second throttle orifice 23. This causes a sudden change in the acoustic impedance within the intake airway, thereby achieving noise cancellation at specific frequencies. This eliminates the need for noise-absorbing materials, ensuring user safety during use and reducing the cost of using the ventilator.

[0032] Furthermore, the fan assembly also includes a first partition 30 disposed within the first air duct 221 and a second partition 40 disposed within the second air duct 222, both the first partition 30 and the second partition 40 having a plurality of vent holes 50. In this embodiment, the plurality of vent holes 50 are arranged uniformly in a matrix on the first partition 30 and the second partition 40. The aperture size of the vent holes 50 is set between 1mm and 30mm, and the number of vent holes 50 on the first partition 30 or the second partition 40 is set between 1 and 300.

[0033] Furthermore, a first resonant cavity 31 is formed between the first partition 30 and the shell 20. In this embodiment, the first resonant cavity 31 is a closed cavity formed by the first partition 30 and the shell 20, and the first resonant cavity 31 is connected to the first air passage 221 through multiple vent holes 50. When the sound wave in the first air passage 221 is incident on the first partition 30, due to the sudden change in acoustic impedance, part of the sound wave is reflected back and interferes with and cancels out the original sound wave; another part of the sound wave enters the first resonant cavity 31 through the vent holes 50, causing the air column in the vent holes 50 to vibrate. The damping of the vibration converts part of the sound energy into heat energy and consumes it, thereby weakening the sound wave energy propagating outward.

[0034] Furthermore, a second resonant cavity 41 is formed between the second partition 40 and the shell 20. In this embodiment, similarly, the second resonant cavity 41 is a closed cavity formed by the second partition 40 and the shell 20, and the second resonant cavity 41 is connected to the second air passage 222 through multiple vent holes 50. When the sound wave in the second air passage 222 is incident on the second partition 40, due to the sudden change in acoustic impedance, part of the sound wave is reflected back and interferes with and cancels out the original sound wave; another part of the sound wave enters the second resonant cavity 41 through the vent holes 50, causing the air column in the vent holes 50 to vibrate. The damping of the vibration converts part of the sound energy into heat energy and consumes it, thereby weakening the sound wave energy propagating outward.

[0035] Furthermore, referring to Figure 3, the fan assembly also includes a third partition 60 disposed within the third air duct 223. The third partition 60 divides the third air duct 223 into a first chamber 223a and a second chamber 223b. The third partition 60 is provided with a plurality of air guide holes 61 connecting the first chamber 223a and the second chamber 223b. In this embodiment, the plurality of air guide holes 61 are arranged uniformly in a matrix on the third partition 60. The aperture size of the air guide holes 61 is set between 1mm and 30mm, and the number of air guide holes 61 on the third partition 60 is set between 1 and 300.

[0036] A third partition 60 is provided between the first cavity 223a and the second cavity 223b, and they are interconnected through air vents 61. When noise waves propagate from the first cavity 223a to the second cavity 223b, they are transmitted through multiple air vents 61 on the third partition 60. At this time, the noise spectrum will shift to the high-frequency domain, thereby reducing the audible sound components and forming a microporous noise reduction structure.

[0037] In addition, the combination of multiple expansion cavity silencing structures, resonant cavities and microporous silencing structures reduces the amount of fan noise dissipating outward and increases the loss of noise during propagation, thereby achieving a better silencing effect and improving the overall noise reduction level of the fan components.

[0038] Specifically, the second throttling orifice 24 is exposed within the first cavity 223a, and the air inlet 21 is connected to the second cavity 223b. In this embodiment, gas outside the housing 20 flows into the second cavity 223b through the air inlet 21, gas in the second cavity 223b flows into the first cavity 223a through the air guide hole 61, and gas in the first cavity 223a flows into the second air passage 222 through the second throttling orifice 24.

[0039] Specifically, the housing 20 includes a first housing 20a forming the air inlet 21 and a second housing 20b connecting the first housing 20a. A sealing gasket is provided between the first housing 20a and the second housing 20b for sealing. The third partition 60 is preferably directly molded with the housing 20 to reduce manufacturing costs. A portion of the third partition 60 is molded with the first housing 20a, and another portion is molded with the second housing 20b. After assembling the first housing 20a and the second housing 20b, they together constitute the entire third partition 60.

[0040] Furthermore, referring to Figure 3, the fan assembly also includes an air inlet pipe 70 disposed within the second cavity 223b. The air inlet pipe 70 has a fixed end that connects to the air inlet 21 and a free end that faces away from the fixed end. The free end is spaced apart from the inner wall of the housing 20. In this embodiment, external air enters the air inlet pipe 70 through the air inlet 21 and is then introduced into the third air passage 223, i.e., into the second cavity 223b. The cross-section of the air inlet pipe 70 is preferably circular, and the longitudinal cross-section of the air inlet pipe 70 is an isosceles trapezoid, i.e., the aperture size of the air inlet pipe 70 gradually decreases from the fixed end toward the free end.

[0041] The air inlet pipe 70 is located in the second cavity 223b within the third air passage 223, and extends into the second cavity 223b after docking with the air inlet 21. The free end of the air inlet pipe 70 is spaced apart from the housing 20, which weakens the sound waves flowing from the third air passage 223 to the air inlet 21, thus reducing the noise reduction effect of the air passage.

[0042] Specifically, as shown in Figure 3, the air inlet pipe 70 is integrally formed with the first shell 20a, is disposed within the second cavity 223b and extends toward the second shell 20b, and is spaced apart from the second shell 20b. The axial length of the air inlet pipe 70 is less than or equal to 100mm.

[0043] Furthermore, continuing to refer to FIG2, the fan assembly also includes a mounting member 80 connecting the fan 10 and the housing 20. The first air passage 221 and the third air passage 223 are formed on opposite sides of the mounting member 80, and the second air passage 222 is located on the same side of the first air passage 221 and the third air passage 223.

[0044] In this embodiment, the first throttling orifice 23 and the second throttling orifice 24 are arranged along the axial direction of the fan impeller. When the first throttling orifice 23 connects the first air passage 221 and the second air passage 222, it changes the gas flow direction in the two air passages, making the gas flow direction in the first air passage 221 and the gas flow direction in the second air passage 222 form a certain angle, preferably 90°. Therefore, it increases the time that the fan noise resides in the first resonant cavity 31 and the first throttling orifice 23, thereby increasing the noise reduction time of the resonant cavity and expansion cavity silencing structure.

[0045] Similarly, when the second throttling orifice 24 connects the second air passage 222 and the third air passage 223, it changes the gas flow direction in both air passages, causing the gas flow direction in the second air passage 222 to form a certain angle with the gas flow direction in the third air passage 223, preferably 90°. Therefore, it increases the time that the fan noise resides in the second resonant cavity 41, the second throttling orifice 24, and the microporous silencing structure, thereby increasing the noise reduction time of the resonant cavity, the expansion cavity silencing structure, and the microporous silencing structure.

[0046] Furthermore, the first resonant cavity 31 is located on the side of the first air passage 221 away from the fan 10, and the second resonant cavity 41 is located on the side of the second air passage 222 away from the fan 10. In this embodiment, the second cavity 223b is located on the side of the first cavity 223a away from the fan 10. As shown in the airflow diagram in Figure 2, when the fan 10 draws gas from outside the housing 20, since the first cavity 223a and the second air passage 222 are directly connected through the second throttle port 24, and the second air passage 222 and the first air passage 221 are directly connected through the first throttle port 23, the airflow turbulence in the intake air passage is reduced, thereby ensuring that the air outside the housing 20 can smoothly enter the fan 10 while satisfying noise reduction and sound attenuation.

[0047] Specifically, the first partition 30 has a first flat plate portion 32 forming a plurality of vent holes 50, which faces the air inlet 11. In this embodiment, the first partition 30 is a flat plate structure and is connected between the first shell 20a and the second shell 20b by plugging in, without the need for fasteners. Since the negative pressure at the air inlet 11 is relatively large, noise will be generated when the gas flow is large. Therefore, by facing the plurality of vent holes 50 on the first flat plate portion 32 directly towards the air inlet 11, it is possible to get closer to the noise source and reduce noise at the noise source, preventing further propagation of noise. Moreover, the axis of the vent holes 50 on the first flat plate portion 32 is parallel to the axis of the fan impeller, which allows the noise sound waves to directly enter the first resonant cavity 31 along the axis of the vent holes 50, thus preventing the propagation of noise.

[0048] Furthermore, the second partition 40 has a second flat plate portion 42 forming a plurality of vent holes 50, and the plane of the second flat plate portion 42 is perpendicular to the plane of the first flat plate portion 32. In this embodiment, the entire second partition 40 is n-shaped and is connected between the first shell 20a and the second shell 20b by means of pin positioning, without the need for fasteners. The second flat plate portion 42 faces one side of the fan 10, and the axis of the vent holes 50 on the second flat plate portion 42 is perpendicular to the axis of the fan impeller, thereby reducing noise on the side of the fan 10.

[0049] In addition, the third partition 60 has a third flat plate portion 62 forming an air guide hole 61. The plane of the third flat plate portion 62 is parallel to the first flat plate portion 32 and is disposed opposite to each other on both sides of the mounting member 80, thereby surrounding the fan 10 to reduce noise.

[0050] Furthermore, the fan 10 abuts against the inner wall of the mounting member 80. In this embodiment, the mounting member 50 is made of an elastic material, and the mounting member 80 elastically abuts against the fan 10, causing the fan 10 to suspend within the housing 20, blocking the vibration generated during the operation of the fan 10, thereby reducing the noise generated during the operation of the fan 10. The mounting member 80 is preferably made of silicone material, and the silicone has a Shore hardness between 30 and 70.

[0051] Furthermore, at least a portion of the fan 10 is exposed within the third air duct 223. In this embodiment, the motor portion of the fan 10 is exposed in the first cavity 223a within the third air duct 223 of the docking hole 54, and external air flowing in through the air inlet 21 is used to dissipate heat from the fan 10, thereby improving the service life of the fan 10.

[0052] In addition, a portion of the fan 10 is located within the third air duct 223, specifically the motor portion of the fan 10. Noise reduction is achieved using the air inlet pipe 70 and the third baffle 60 within the third air duct 223. The remaining portion of the fan 10 is located within the first air duct 221, where noise reduction is achieved using the first resonant cavity 31, ensuring that all noise generated by the fan 10 is reduced and silenced.

[0053] Furthermore, the housing 20 also has a first pressure sampling port 25 and a second pressure sampling port 26 connected to the air intake passage. The first pressure sampling port 25 is connected to the first air passage 221, and the second pressure sampling port 26 is connected to the third air passage 223. In this embodiment, the air guide holes 61 on the third partition 60 can connect the first pressure sampling port 25 and the second pressure sampling port 26. The third partition 60 containing multiple air guide holes 61 can hinder the flow of gas in the air intake passage, thereby reducing the cross-sectional area for sound energy propagation. The first pressure sampling port 25 and the second pressure sampling port 26 are located upstream and downstream of the third partition 60 containing multiple air guide holes 61, respectively. Since the flow area of ​​the third partition 60 containing multiple air guide holes 61 is constant, by obtaining the pressure difference between the first pressure sampling port 25 and the second pressure sampling port 26, and then according to Bernoulli's principle, the flow rate value in the air intake passage can be calculated and obtained. The user can adjust the flow rate value by adjusting the speed of the fan 10 as needed. By placing the two pressure-collecting ports in different cavities, the coverage path of the pressure-collecting section within the cavity is increased, thereby improving the accuracy of flow monitoring.

[0054] Furthermore, the first pressure sampling port 25 and the second pressure sampling port 26 are located on the same side of the housing 20. In this embodiment, as shown in Figure 1, the first pressure sampling port 25 and the second pressure sampling port 26 are located on the same side of the housing 20 and are arranged along the impeller axis of the blower 10, so that the first pressure sampling port 25 and the second pressure sampling port 26 are arranged adjacent to each other, thereby reducing the distance between the first pressure sampling port 25 and the second pressure sampling port 26, which makes it easier for users to install pressure sensors at the first pressure sampling port 25 and the second pressure sampling port 26 and to monitor the flow rate.

[0055] Specifically, both the first pressure-collecting port 25 and the second pressure-collecting port 26 are located on the second shell 20b. The second pressure-collecting port 26 is connected to the second cavity 223b.

[0056] According to another aspect of the invention, a ventilator is also provided, the ventilator being provided with a fan assembly according to the invention. The exhaust port of the fan 10 is connected to the output pipe of the ventilator, which is connected to the air outlet of the mounting component.

[0057] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0058] The detailed descriptions listed above are merely specific descriptions of feasible embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. All equivalent embodiments or modifications made without departing from the spirit of the present invention should be included within the scope of protection of the present invention.

Claims

1. A wind turbine assembly, comprising: A fan, the fan having an air inlet; a housing, the housing having an air inlet and an air intake duct connecting the air inlet and the air inlet; characterized in that the air intake duct includes a first air duct, a second air duct, and a third air duct connected in sequence, the air inlet being exposed in the first air duct, the air intake being exposed in the third air duct, the housing also having a first throttling orifice exposed toward the first and second air ducts and a second throttling orifice exposed toward the second and third air ducts, the airflow in the first throttling orifice and the second throttling orifice being directed in different directions; the fan assembly further includes a third partition disposed in the third air duct, the third partition dividing the third air duct into a first chamber and a second chamber, the third partition having a plurality of air guide holes connecting the first chamber and the second chamber, the second throttling orifice being exposed in the first chamber, the air inlet being connected in the second chamber; the fan assembly further includes an air intake pipe disposed in the second chamber, the air intake pipe having a fixed end that connects to the air inlet and a free end that is away from the fixed end, the free end being spaced apart from the inner wall of the housing.

2. The wind turbine assembly as described in claim 1, characterized in that, The fan assembly further includes a first partition plate disposed in a first air duct and a second partition plate disposed in a second air duct. Both the first partition plate and the second partition plate are provided with multiple air vents. A first resonant cavity is formed between the first partition plate and the housing, and a second resonant cavity is formed between the second partition plate and the housing.

3. The wind turbine assembly as described in claim 1, characterized in that, The fan assembly also includes a mounting component connecting the fan to the housing, wherein the first air duct and the third air duct are formed on opposite sides of the mounting component, and the second air duct is located on the same side of the first air duct and the third air duct.

4. The wind turbine assembly as described in claim 2, characterized in that, The first resonant cavity is located on the side of the first air duct away from the fan, and the second resonant cavity is located on the side of the second air duct away from the fan.

5. The wind turbine assembly as described in claim 2, characterized in that, The first partition has a first flat plate portion forming a plurality of vent holes, the first flat plate portion being directly opposite the air inlet, and the second partition has a second flat plate portion forming a plurality of vent holes, the plane of the second flat plate portion being perpendicular to the plane of the first flat plate portion.

6. The wind turbine assembly as described in claim 3, characterized in that, The fan abuts against the inner wall of the mounting and is at least partially exposed within the third air passage.

7. The wind turbine assembly as described in claim 1, characterized in that, The housing also has a first pressure port and a second pressure port connected to the air intake passage. The first pressure port is connected to the first air passage, and the second pressure port is connected to the third air passage. The first pressure port and the second pressure port are located on the same side of the housing.

8. A ventilator, characterized in that, The ventilator includes a fan assembly as described in any one of claims 1 to 7.

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