A blower providing a pressurized system

Abstract

A kind of blower for providing pressurization system, by blower housing with air inlet and air outlet, brushless DC motor including rotor assembly, stator assembly, permanent magnet and bearing, and impeller between stator assembly and air inlet of housing.The housing and the outer surface of brushless DC motor jointly form the air channel of the blower for providing gas flow, which provides spiral flow of gas.In the process of blower operation, gas enters the air channel of the blower for providing spiral flow of gas from the air inlet of the housing, drives the rotation of rotor assembly by stator assembly in brushless DC motor, so that rotor assembly drives impeller to move at high speed to pressurize gas to 2cmH2O-40cmH2O, and the pressurized gas is discharged from the outlet of the housing again through the air channel of the blower for providing spiral flow of gas, to realize the complete operation process of the blower.

Description

Technical Field

[0001] This invention relates to a blower providing a pressurization system, comprising a blower housing, an impeller, and a brushless DC motor, wherein the housing has an air inlet and an air outlet, the impeller is located between the stator assembly and the air inlet of the housing, and the brushless DC motor includes a rotor assembly, a stator assembly, a permanent magnet, and bearings. Background Technology

[0002] The increasingly fast pace of modern life and rising work and life pressures have led to significant changes in people's lifestyles. These changes include lack of exercise, unhealthy eating habits, and insufficient sleep. Simultaneously, the aging population and the continuously increasing proportion of elderly people have resulted in a rising prevalence of chronic respiratory diseases among this group. Furthermore, air pollution and declining air quality have also had a significant negative impact on the respiratory system; long-term exposure to polluted air can trigger or exacerbate various respiratory illnesses. These combined factors have led to a growing number of people suffering from respiratory-related diseases in modern society, resulting in a growing awareness of respiratory health.

[0003] Common respiratory-related diseases include chronic obstructive pulmonary disease (COPD), asthma, pneumonia, bronchitis, pulmonary fibrosis, and obstructive sleep apnea syndrome (OAS). Different treatment methods exist for different respiratory-related diseases and varying degrees of severity. Among these, OAS is one of the most prevalent diseases. In general, OAS is treated primarily with home-use CPAP machines, and the blower is the core component of the CPAP machine that provides the therapeutic gas pressure.

[0004] The blowers in ventilators can be classified in several ways: based on their working principle, they are mainly divided into centrifugal blowers and axial flow blowers; based on the airflow delivery method, they can be divided into unidirectional blowers and bidirectional blowers; and based on the adjustment method, they can be divided into constant pressure blowers and adjustable pressure blowers. Existing blowers used in ventilators mainly consist of an impeller (the core component of the blower, usually driven directly by a high-speed brushless DC motor to achieve efficient airflow and pressure regulation), a brushless DC motor (providing power to operate the blower; this can be a DC-powered brushless DC motor, an AC-powered brushless DC motor, or other types of servo brushless DC motors), bearings (supporting the impeller and reducing friction during impeller rotation to ensure efficient and stable operation), a control circuit (responsible for adjusting the speed and power of the brushless DC motor to control airflow output and pressure levels), and a housing (protecting internal components and guiding airflow, while also providing airway heat dissipation and some sound insulation). These components work together to ensure that the ventilator provides stable and comfortable respiratory support. The working process of the blower is as follows: the power supply drives the brushless motor to drive the impeller to rotate through the shaft. Due to the high speed of the impeller rotation, air is continuously drawn into the blower from the air inlet. The gas is pressurized inside the blower to 2cmH2O-40cmH2O and then flows through the air passage formed by the blower casing to the blower outlet. Summary of the Invention

[0005] The objective of this invention is to construct a blower that provides a pressurization system, improve the internal structure of the blower to achieve a suitable noise range, extend the blower's lifespan, facilitate the manufacturing of blowers for respiratory devices, and enable the blower to quickly adapt to the market. It also overcomes the limitations of existing similar products, thereby providing a more effective and widely applicable solution that delivers continuous positive pressure airflow to the user's airway for the treatment of sleep apnea.

[0006] A blower providing a pressurization system, configured to pressurize gas to 2cmH2O-40cmH2O and deliver it to the outlet of a respiratory-related device, characterized in that the blower comprises:

[0007] The blower housing is constructed to surround the internal structure of the blower and to form an air passage that provides a spiral flow of gas, including an air inlet and an air outlet.

[0008] An impeller, comprising multiple blades and at least one housing, is configured to provide acceleration to the airflow entering the interior of the blower and to guide the airflow radially;

[0009] A brushless DC motor includes a rotor assembly, a stator assembly, a permanent magnet, and bearings. The motor has a first side close to the blower housing and a second side away from the blower housing. The impeller is attached to the first side of the motor via the rotor assembly and is driven by the motor.

[0010] The air passage space is divided into a first region above the impeller and a second region below the impeller, with the impeller as the dividing line. The space of the second region is greater than or equal to the space of the first region.

[0011] Wherein, the vertical distance between the bottom plane of the second region furthest from the impeller and the impeller is greater than or equal to 10 mm.

[0012] In one embodiment, the blower housing includes at least two components configured to join together to form a complete blower housing.

[0013] In one embodiment, the stator assembly has a stator assembly housing exposed to an air passage that provides a helical flow of gas, configured to reduce the temperature of the stator assembly as the gas flows through the air passage.

[0014] In one embodiment, the stator assembly is simultaneously exposed within the blower's air duct and to the external environment not enclosed by the blower housing.

[0015] In one embodiment, the impeller has a central opening, and the blower inlet restricts the central opening of the impeller.

[0016] In one embodiment, the impeller is coaxially aligned with the blower housing.

[0017] The present invention also discloses a blower providing a pressurization system according to an embodiment of this application, configured to pressurize gas to 2cmH2O-40cmH2O and deliver it to the outlet of a respiratory-related device, characterized in that the blower comprises:

[0018] The blower housing is constructed to surround the internal structure of the blower and to form an air passage that provides a spiral flow of gas, including an air inlet and an air outlet.

[0019] An impeller includes a plurality of blades and at least one housing, wherein the housing includes at least an upper housing and a lower housing, the upper housing and the lower housing clamping the plurality of blades and forming a plurality of impeller channels, the impeller being configured to provide acceleration to airflow entering the interior of a blower and to guide the airflow radially through the plurality of impeller channels;

[0020] A brushless DC motor includes a rotor assembly, a stator assembly, a permanent magnet, and bearings. The motor has a first side close to the blower housing and a second side away from the blower housing. The impeller is attached to the first side of the motor via the rotor assembly and is driven by the motor.

[0021] The air passage space is divided into a first region above the impeller and a second region below the impeller, with the space of the second region being greater than or equal to the space of the first region.

[0022] In one embodiment, the upper housing of the impeller includes a protrusion at a central opening.

[0023] In one embodiment, the upper housing is gradually offset downward in the radial direction relative to the axial direction.

[0024] In one embodiment, the impeller has a central opening configured as an inlet for airflow into the impeller channel, and the height of each blade gradually decreases from the central opening to the periphery of the impeller.

[0025] In one embodiment, each blade has an edge at the central opening that forms an angle with the lower housing, the angle being less than 90°.

[0026] In one embodiment, the vertical distance between the bottom plane of the second region away from the impeller and the lower housing is greater than or equal to 10 mm.

[0027] This invention also discloses a blower providing a pressurization system according to an embodiment of this application, configured to pressurize gas to 2cmH2O-40cmH2O and deliver it to the outlet of a respiratory-related device, characterized in that the blower comprises:

[0028] The blower housing is constructed to surround the internal structure of the blower and to form an air passage that provides a spiral flow of gas, including an air inlet and an air outlet.

[0029] An impeller includes a plurality of blades and at least one housing, wherein the housing includes at least an upper housing and a lower housing, the upper housing and the lower housing clamping the plurality of blades and forming a plurality of impeller channels, the impeller being configured to provide acceleration to airflow entering the interior of a blower and to guide the airflow radially through the plurality of impeller channels;

[0030] A brushless DC motor includes a rotor assembly, a stator assembly, a permanent magnet, and bearings. The motor has a first side close to the blower housing and a second side away from the blower housing. The impeller is attached to the first side of the motor via the rotor assembly and is driven by the motor.

[0031] The lower housing includes a first sheet and a second sheet, which are arranged coaxially.

[0032] The air passage space is divided into a first region above the impeller and a second region below the impeller, with the impeller as the dividing line. The first region and the second region form a gas flow through the gap between the second thin plate and the blower housing. The airflow flows at high speed through the impeller channel in the first region and then enters the second region to buffer the airflow.

[0033] In one embodiment, the diameter of the second sheet is larger than the diameter of the first sheet.

[0034] In one embodiment, a gap is formed between the second sheet and the blower housing, the gap being evenly distributed around the outer periphery of the second sheet, configured such that airflow flows evenly from the first region to the second region.

[0035] In one embodiment, the ratio of the thickness of the first sheet to the thickness of the second sheet is in the range of 0.7-1.3.

[0036] In one embodiment, the space of the second region is greater than or equal to the space of the first region.

[0037] In one embodiment, the space of the second region is smaller than the space of the first region.

[0038] The present invention also discloses a blower providing a pressurization system according to an embodiment of this application, configured to pressurize gas to 2cmH2O-40cmH2O and deliver it to the outlet of a respiratory-related device, characterized in that the blower comprises:

[0039] The blower housing is constructed to surround the internal structure of the blower and to form an air passage that provides a spiral flow of gas, including an air inlet and an air outlet.

[0040] An impeller, comprising multiple blades and at least one housing, is configured to provide acceleration to the airflow entering the interior of the blower and to guide the airflow radially;

[0041] A brushless DC motor includes a rotor assembly, a stator assembly, a permanent magnet, and bearings. The motor has a first side close to the blower housing and a second side away from the blower housing. The impeller is attached to the first side of the motor via the rotor assembly and is driven by the motor.

[0042] The stator assembly has a stator assembly housing, the outer surface of which is at least partially exposed in an air passage surrounding the stator assembly that provides helical gas flow, and is configured to allow the airflow to convectively cool the stator assembly when the blower is in operation.

[0043] Among them, a non-integral tube is constructed between the rotor assembly and the stator assembly;

[0044] The stator assembly includes a stator with a central hole and multiple coils in a distributed winding configuration, the multiple coils including a per-phase coil group for a multiphase switched reluctance brushless DC motor, and the stator including multiple protruding stator teeth.

[0045] The stator comprises multiple laminations and an insulating material that wraps around the laminations.

[0046] In one embodiment, the non-integral tube is configured to have two parts, which are separated with gaps inside the blower.

[0047] In one embodiment, the motor has a flange for supporting the blower housing.

[0048] In one embodiment, the rotor assembly includes a metal component that contacts and engages with the impeller.

[0049] In one embodiment, the rotor assembly is coaxial with the stator and does not form an air gap.

[0050] In one embodiment, the airflow does not flow through the interior of the stator assembly.

[0051] The blower implementing the present invention has at least the following beneficial effects:

[0052] 1) To improve the quietness of the blower, reduce the impact of breathing-related devices on users, and enhance user comfort, the blower's structure and components underwent comprehensive improvement, testing, verification, and continuous optimization, resulting in a blower that is quieter and more comfortable to use than those currently on the market. First, the air duct inside the blower casing was moved downwards relative to the impeller, and its space was optimized. Combined with a unique impeller partitioning design, the internal air duct of the blower was further optimized. Based on this, the blower impeller was replaced with a quieter and more efficient closed impeller (an impeller with upper and lower casings), and a unique motor design was adopted to achieve optimal matching between the impeller and motor. The optimized impeller and motor matching, along with the improved air duct design inside the blower casing that provides spiral gas flow, resulted in a significant overall improvement, making the blower designed in this invention more beneficial to the user. These improvements not only enhance the device's quietness but also make it more user-friendly, significantly improving the overall performance of the product and the user experience. Specifically, there are several improvements in the structure and its fit, as well as their advantages.

[0053] 2) Designing the impeller with multiple housings offers several advantages. For example, a) the impeller has an upper and lower housing that holds multiple blades between them, forming a more enclosed impeller channel. This enclosed channel reduces gas leakage from the sides of the impeller, more effectively plans the airflow path, and allows the airflow to pass through the impeller more smoothly, reducing turbulence and energy loss. Therefore, its efficiency is higher than open and semi-open impellers, typically 1-3% higher. This design also helps improve the overall sealing performance of the blower, reducing gas backflow losses, thereby further improving the blower's efficiency and performance. b) Because the upper and lower housings better plan the airflow path, the airflow inside the impeller is smoother, reducing eddies and turbulence, thus lowering the probability of noise generation. Furthermore, the impeller of this invention has greater rigidity, resulting in relatively less vibration during blower operation. In addition, due to its more robust and symmetrical structure, it has better balance performance and more stable operation, which is more conducive to noise reduction. c. The impeller of this invention can maintain stable performance under relatively high gas pressures, mainly because its upper and lower casing structures are designed to improve pressure and deformation resistance, ensuring that the blower impeller reduces pressure fluctuations under high pressure conditions, thus ensuring stable operation. This advantage is of great significance for breathing-related devices that require repeated pressure changes during operation, enabling them to better cope with various gas pressure variations, making them a more ideal choice for breathing-related devices, and extending the service life of the devices.

[0054] 3) The design of the second thin plate divides the originally integrated internal gas flow channel into two regions, offering many advantages that traditional blowers cannot achieve. In traditional blowers, gas is drawn into the blower from the inlet, accelerated by the impeller, and then flows directly out of the outlet. The airflow channel is short, and the high-speed gas leaving the impeller flows directly to the edge or vortex of the blower, which defines the gas flow channel. This limited space means that the high-speed gas entering the vortex is usually turbulent, leading to low blower performance. The turbulent gas at the impeller edge and vortex also introduces new noise sources into the blower. In contrast, this invention designs a second thin plate below the first thin plate of the impeller. This plate allows the high-speed gas flowing out of the impeller channel to transition smoothly from the first region into the vortex (i.e., in the second region), reducing airflow impact. The first region allows for high-speed gas flow, while the uniform gap between the second fin and the inner surface of the blower housing allows for even airflow to the lower second region. This eliminates (or significantly reduces) the edge effects that generate turbulence. Furthermore, the space of the second region is designed to be greater than or equal to that of the first region. In particular, when the space of the second region is larger than that of the first region, the increased volume slows down the gas velocity and increases the gas pressure as the airflow enters from the first region. This reduced gas velocity not only decreases turbulence but also allows the blower of this invention to operate over a wider pressure range and significantly reduce noise levels compared to other blowers. Because the diameter of the second fin is larger than that of the first fin, this structure effectively prevents gas backflow, further reducing noise and thus improving the overall performance and quietness of the blower. The division into two regions also increases the airflow channel, offering advantages such as reduced impact, lower noise, and increased efficiency.

[0055] 4) Lowering the air duct to the middle of the blower has several advantages: a. Lowering the air duct to the middle of the blower allows the airflow entering the blower to pass through the motor, thus carrying away the heat generated by the motor's operation. This helps dissipate heat from the motor and keeps it operating within a suitable temperature range, preventing overheating from prolonged use and improving motor efficiency and lifespan, thereby increasing the blower's efficiency and lifespan. b. Current blower air duct designs on the market place the air duct at the impeller. This design causes the airflow, immediately pressurized by the impeller, to enter the duct and be output. The sudden and rapid change in airflow at the impeller and duct can lead to turbulence or irregular flow, increasing blower noise. Furthermore, this sudden change can cause airflow oscillation, further exacerbating noise. In contrast, lowering the air duct to the middle of the blower provides a buffer space for the pressurized airflow, allowing it to flow more smoothly and evenly along the duct path. This reduces turbulence and irregular flow within the blower, thus reducing noise. c. By combining the function of the second thin plate, the originally integrated air duct providing spiral gas flow is divided into a flow path from the first region to the second region. The lowered air duct increases the previously limited space, allowing the second thin plate to fully exert its efficiency and providing a more optimized flow path for the airflow. By lowering the air duct, the airflow can achieve a smoother transition in the second region, avoiding abrupt changes in airflow caused by space constraints, thus reducing turbulence formation and lowering blower noise. This improvement also optimizes the aerodynamic performance of the entire air duct, enhances the efficiency and stability of the blower, maximizes the noise reduction effect of the second thin plate, and achieves a quieter and more efficient blower operation. d. When the blower uses a closed impeller, unlike a non-closed impeller, its blades are enclosed in the outer casings at both ends. The impeller has a central opening, and the airflow enters from the central opening of the impeller. After passing through the impeller flow channel formed by the blades, it can output airflow at a higher pressure from the relatively enclosed structure. Non-closed impellers have a more open structure, allowing airflow to flow freely on both sides of the impeller without much path restriction. Therefore, blowers using closed impellers require a lowered air duct to provide more space for the pressurized airflow to be integrated and guided, improving the blower's performance and efficiency. e. Designing the air duct at the center of the blower also improves its stability within the breathing equipment. Existing blowers on the market have their internal air ducts located at the top, while this invention moves them downwards, shifting the blower's center of gravity downwards as well. This reduces mechanical vibration caused by changes in airflow pressure and velocity, further improving the blower's operational stability and safety. It also helps the support frame to more stably and securely fix the blower within the breathing equipment, reducing some motor noise.

[0056] 5) In addition to the structural improvements mentioned above, the motor itself has also been improved. The most significant improvement is the use of insulating material to wrap the laminated coils, preventing the coils from directly contacting the laminates. The advantages of this method are as follows: a. Wrapping the insulating material around the laminates enhances the motor's electrical insulation and reduces electromagnetic interference. The insulating material effectively prevents electrical short circuits between the laminates and other motor components, and prevents accidental current flow between different windings or between the windings and the motor housing. The insulating material also suppresses magnetic leakage within the motor, reducing electromagnetic interference. The insulating material not only improves the motor's electromagnetic compatibility but also reduces electromagnetic noise that may be generated during motor operation, further reducing blower noise. b. This structural improvement also enhances the motor's thermal management and heat dissipation. The insulating material has excellent thermal conductivity; although wrapped around the laminates, it transfers heat from the windings to the motor housing. Combined with airflow cooling the motor housing, this effectively improves the motor's heat dissipation efficiency, thereby extending the motor's lifespan. c. Improved motor durability. The insulation material effectively prevents damage to the laminations from adverse environmental conditions, reducing motor aging and performance degradation caused by environmental factors. This structure also simplifies motor installation and maintenance, avoiding safety hazards caused by exposed laminations, thereby reducing motor failures and extending motor lifespan. Furthermore, the insulation material provides additional mechanical protection for the laminations, preventing damage from physical impacts, vibrations, or other stresses, helping to maintain the motor's structural integrity and long-term reliability. Attached Figure Description

[0057] Figure 1 This is a three-dimensional schematic diagram of the blower in Embodiment 1 of the present invention;

[0058] Figure 2 This is a schematic diagram showing the disassembled casing of the blower in Embodiment 1 of the present invention;

[0059] Figure 3 This is an exploded view of the blower structure in Embodiment 1 of the present invention;

[0060] Figure 4 This is a schematic diagram of the area division of the blower in Embodiment 1 of the present invention;

[0061] Figure 5 This is a side view of the blower in Embodiment 1 of the present invention;

[0062] Figure 6 A schematic diagram showing that the air outlet of the blower is constructed in the second region;

[0063] Figure 7This is a schematic diagram of the gas flow in the gas duct of the blower in Embodiment 1 of the present invention, which provides a spiral flow of gas.

[0064] Figure 8 This is a top view of the blower in Embodiment 1 of the present invention;

[0065] Figure 9 The blower in Embodiment 1 of the present invention is in Figure 8 Cross-sectional view at point AA;

[0066] Figure 10 This is a schematic diagram of the airflow path in the blower in Embodiment 1 of the present invention;

[0067] Figure 11 The blower in Embodiment 1 of the present invention is in Figure 8 A three-dimensional cross-sectional view of point AA in the diagram;

[0068] Figure 12 This is a three-dimensional schematic diagram of the blower structure in Embodiment 1 of the present invention;

[0069] Figure 13 This is a structural breakdown diagram of the impeller and other components of the blower in Embodiment 1 of the present invention;

[0070] Figure 14 This is a side view of the blower structure in Embodiment 1 of the present invention;

[0071] Figure 15 This is a three-dimensional schematic diagram and side view of the impeller in Embodiment 1 of the present invention;

[0072] Figure 16 This is a schematic diagram of the gas flow path in the impeller channel in Embodiment 1 of the present invention;

[0073] Figure 17 This is a side view of the blower structure in another embodiment of Embodiment 1 of the present invention;

[0074] Figure 18 This is a schematic diagram of the gas flow path in the impeller channel in another embodiment of Embodiment 1 of the present invention;

[0075] Figure 19 This is a schematic diagram showing the limitation of the impeller center opening at the blower inlet in Embodiment 1 of the present invention;

[0076] Figure 20 This is a three-dimensional schematic diagram of the motor and impeller in Embodiment 1 of the present invention;

[0077] Figure 21 This is a cross-sectional view of the motor and impeller in Embodiment 1 of the present invention;

[0078] Figure 22This is a schematic diagram of the rotor assembly of the blower in Embodiment 1 of the present invention;

[0079] Figure 23 This is a three-dimensional schematic diagram of the stator of the blower in Embodiment 1 of the present invention;

[0080] Figure 24 This is a top view of the stator of the blower in Embodiment 1 of the present invention;

[0081] Figure 25 In Embodiment 1 of the present invention, the insulating material is wrapped around the laminated sheets. Figure 24 A cross-sectional view of point BB;

[0082] Figure 26 In Embodiment 1 of the present invention, the insulating material is wrapped around the laminated sheets. Figure 24 A cross-sectional view at point CC;

[0083] Figure 27 This is a three-dimensional schematic diagram of the insulating material wrapping and stacking sheets in Embodiment 1 of the present invention. Detailed Implementation

[0084] To facilitate understanding of the invention, a more complete description will be given below with reference to the accompanying drawings. Typical embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of the invention more thorough and complete.

[0085] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the invention pertains. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0086] This invention addresses the issue of existing respiratory devices, such as ventilators, using foam for noise reduction in their blowers. It addresses the problems of foam being prone to damage and aging, posing risks to user health and safety, and involving more complex manufacturing processes and environmental impact. This invention provides a safer, more reliable, and easier-to-maintain blower. The blower designed in this invention not only overcomes the various disadvantages of existing blowers but also ensures that the overall noise level meets regulatory requirements. It represents a superior technological invention for users, manufacturers, and the market. Furthermore, the use of a resonant cavity structure inside the blower instead of traditional foam noise reduction is a sustainable and environmentally friendly design.

[0087] The following examples illustrate several structures of a blower that provides a pressurization system according to the present invention.

[0088] Example 1

[0089] This embodiment provides a three-dimensional schematic diagram, exploded view, cross-sectional view, side view, top view, gas flow diagram, and structural schematic diagram of the blower 1, for reference as follows: Figure 1-27 This embodiment relates to a blower 1 providing a pressurization system, configured to pressurize gas to 2cmH2O-40cmH2O and deliver it to the outlet of a respiratory-related device, comprising: a blower housing 2, configured to surround the internal structure of the blower 1 and form an air passage providing a spiral flow of gas, including an inlet 21 and an outlet 22; an impeller 3, including a plurality of blades 31 and at least one housing 32, configured to provide acceleration to the airflow entering the interior of the blower 1 and to radially guide the airflow; and a brushless DC motor 4, including a rotor assembly 41, a stator assembly 42, a permanent magnet, and a bearing 43, the motor 4 having a first side 23 near the blower housing 2 and a second side 24 away from the blower housing 2, the impeller 3 being attached to the first side 23 of the motor 4 via the rotor assembly 41 and driven by the motor 4.

[0090] The air duct space is divided into a first region above the impeller 3 and a second region below the impeller 3, with the impeller 3 as the dividing line. Specifically, the space of the second region is greater than or equal to the space of the first region, with the bottom plane of the impeller 3 as the dividing line. In an orthogonal view along the axis of the blower outlet 22, at least 50% of the outlet 22 is configured to be located in the second region (e.g., ...). Figure 6 As shown in Figures A, B, and C, which represent 100%, 75%, and 50% of the air outlet 22 respectively (as an example of the second region), this method moves the air passage away from the blower inlet 21, lowering the air passage within the blower 1 to a position roughly in the middle of the blower 1 (roughly can be understood here as the midpoint of the blower 1 fluctuating within 20 percent), thereby reducing blower noise and better planning the airflow path. It can also reduce the heat generated by the motor 4 through airflow, preventing the motor from malfunctioning due to excessively high temperatures.

[0091] Specifically, the blower housing 2 is constructed comprising at least two components configured to join together to form a complete blower housing 2. An air inlet 21 is located on one of the components of the blower housing 2, and the axes of the air inlet 21 and the air outlet 22 are perpendicular to each other. The air inlet 21 has a rounded chamfer to facilitate better airflow into the blower 1, reducing noise. The blower housing 2 of this invention is taller and has a larger internal space than existing blower housings 2, facilitating airflow integration to reduce noise. In some special cases, the blower housing 2 may also be a single, complete housing 2 configured to engage with the motor 4.

[0092] Besides the blower housing 2, the impeller, brushless DC motor, etc., are all part of the internal structure of the blower. The blower 1 includes an impeller 3 located between the stator assembly 42 and the housing inlet 21. The impeller 3 includes multiple blades 31 and at least one housing 32. The housing 32 includes at least an upper housing 321 and a lower housing 322. The lower housing 322 includes a first slab 3221 and a second slab 3222. In this invention, a slab is defined as having a radius or longer side length that is at least five times its thickness. The impeller 3 is configured to provide acceleration to the airflow entering the blower 1 and to radially guide the airflow through multiple impeller 3 channels. The first thin plate 3221 in the upper housing 321 and the lower housing 322 clamps multiple blades 31 to form the main body of the impeller 3. Having multiple housings, compared to an impeller 3 with only one housing, relatively seals the channels within the impeller 3, reducing airflow leakage and regulating airflow. This not only lowers the noise of the blower 1 but also makes the impeller 3 of the blower 1 more stable and durable by improving the structure. The second thin plate 3222 is located below the first thin plate 3221. The first and second thin plates 3221 and 3222 are coaxially arranged, and the upper housing 321 and lower housing 322 are also coaxially arranged. Simultaneously, the impeller 3 is coaxially aligned with the blower housing 2. In this embodiment, the second thin plate 3222 is not connected to the first thin plate 3221 and is configured on the first side 23 of the motor 4 near the blower housing 2. The upper housing 321 is adjacent to the air inlet 21 of the blower housing 2. Therefore, the upper housing 321 forms the central opening 33 of the impeller 3 and serves as the inlet for airflow into the impeller 3 channel. Furthermore, the upper housing 321 of the impeller 3 includes a protrusion at the central opening 33, configured to engage with the air inlet 21 of the blower housing 2, ensuring smooth airflow into the impeller 3 channel. The protrusion is smoothly connected to the main body (i.e., the disc portion) of the upper housing 321, and the protrusion can be in the form of a conical, inverted conical, or non-tapered cylinder. In some cases, the upper housing 321 can also be a flat surface without protrusions. For blowers 1 used in respiratory applications where noise reduction is important, increasing the diameter of the central opening 33 of the blower 1 may reduce the effective diameter of the overall impeller 3, potentially leading to insufficient pressure generated by the blower 1. However, reducing the diameter of the impeller 3 helps to reduce the size of the blower 1, thus improving the portability and user comfort of respiratory equipment. For respiratory-related equipment, a smaller and quieter blower 1 is preferable. However, reducing the diameter of the impeller 3 requires a relative increase in the size of the central opening 33 of the impeller 3. Therefore, a good balance needs to be found between these two dimensions. In this invention, the diameter of the central opening 33 is 1.5% larger than the diameter of the impeller 3 body. In this embodiment, the upper housing 321 is a non-planar, curved, positive conical shape, specifically, the upper housing 321 is gradually offset downwards in the radial direction relative to the axial direction.

[0093] The central opening 33 formed by the upper housing 321 also defines the edge of the blade 31 at the central opening 33, and the edge of each blade 31 extends obliquely downward at the central opening 33 to the lower housing 322 (e.g. Figure 16 As shown in the diagram, each blade 31 forms an angle less than 90° with the lower housing 322 at the edge of the central opening 33. Generally, the upper housing 321 extends to the outer periphery of the impeller 3 body at the central opening 33, so the diameter of the upper housing 321 is the same as the diameter of the impeller 3 body. However, in some other cases, the upper housing 321 may not extend to the outer periphery of the impeller 3 body; one such case is that the upper housing 321 does not completely cover the entire blade 31, but only covers a portion of the impeller 3. The blades 31 in the impeller 3 can have various forms, such as forward-curved, radial, or backward-curved. The length of the impeller 3 is greater than or equal to the difference between the diameter of the upper housing 321 and the diameter of the central opening 33 of the impeller 3. In this embodiment, the blades 31 gradually narrow near the edges of the central opening 33 and the impeller 3 body, i.e., each blade 31 is spindle-shaped. In other embodiments, the blades 31 may also have a uniform width or a shape that narrows on one side.

[0094] The lower housing 322 of the impeller 3 is planar. The first thin plate 3221, together with the upper housing 321 and multiple blades 31, forms a single unit, with its edge aligned with the edge of the upper housing 321. In some other embodiments, the first thin plate 3221 may also be a disk with a diameter smaller or larger than the upper housing 321. In the impeller 3 body composed of the upper housing 321, blades 31, and first thin plate 3221, the upper housing 321 and lower housing 322 clamp multiple blades 31 and form multiple impeller 3 channels. Specifically, the side surface of each blade 31 cooperates with the inner surface of the upper housing 321 and the inner surface of the first thin plate 3221 to form multiple impeller 3 channels (e.g., ...). Figure 16(As shown). The impeller 3 has a central opening 33, which is configured as the inlet for airflow into the impeller 3 channel. Each impeller 3 channel gradually widens from the inlet at the central opening 33 toward the outlet at the edge of the upper housing 321 and the lower housing 322, that is, the distance between adjacent blades 31 gradually increases in the radial direction of the impeller 3 body. Furthermore, the height of each blade 31 gradually decreases from the central opening 33 to the periphery of the impeller 3, that is, the impeller 3 channel gradually narrows from the inlet to the outlet in a direction perpendicular to the airflow direction. The inlet and outlet of the impeller 3 channel have a generally rectangular cross-sectional shape. To ensure that the airflow entering from the air inlet 21 on the blower housing 2 can completely enter through the central opening 33 of the impeller 3, the size of the two openings is defined. The air inlet 21 of the blower 1 restricts the central opening 33 of the impeller 3, that is, the area of ​​the air inlet 21 on the blower housing 2 is smaller than the area of ​​the central opening 33 of the impeller 3.

[0095] The second thin plate 3222 in the impeller 3 plays a special role in the blower 1, namely, functionally dividing the air passage that provides spiral flow of gas inside the blower 1. The diameter of the second thin plate 3222 is larger than the diameter of the first thin plate 3221, thus blocking the airflow in the first and second regions. Furthermore, a gap is formed between the second thin plate 3222 and the blower housing 2, the gap being evenly distributed around the outer periphery of the second thin plate 3222, configured to allow airflow to flow evenly from the first region to the second region. In other cases, the gap between the second thin plate 3222 and the blower housing 2 may also be non-uniform; one such case is that a gap for gas flow is formed only on a portion of the outer periphery of the second thin plate 3222, and this gap may be crescent-shaped, spindle-shaped, square, or any other shape. Therefore, the air passage space is divided into a first region above the impeller 3 and a second region below the impeller 3, specifically, by the bottom plane of the impeller (e.g., Figure 4 As shown), the first and second regions form a gas flow through the gap between the second thin plate 3222 and the blower housing 2. The airflow flows at high speed through the impeller 3 channel in the first region, and then enters the second region where the airflow is buffered. The high-speed flow and buffering mentioned here can be understood as the airflow rate being different in the first and second regions, and the airflow rate in the first region being higher than that in the second region. The gas flow process inside the blower 1 is as follows: external gas is drawn into the blower 1 from the air inlet 21 of the blower housing 2, enters the impeller 3 channel through the central opening 33, and then flows out from the outlet of the impeller 3 channel. Due to the blocking effect of the second thin plate 3222, the gas flowing out of the impeller 3 channel first flows in the first region, then enters the second region through the gap between the outer periphery of the second thin plate 3222 and the inner surface of the blower housing 2, and finally flows out from the vortex (as shown). Figure 7 , Figure 10 (As shown). The motor 4 applies a strong rotational force to at least the main body of the impeller 3 through the rotor assembly 41, thereby generating a high gas flow rate. The separation of the space between the first and second regions creates a pressure difference, causing the airflow in the first region to naturally enter the second region. When the gas with high velocity and low pressure in the first region enters the second region, the gas velocity decreases and the pressure increases. Furthermore, the space of the second region is greater than or equal to the space of the first region to promote an increase in airflow pressure. Therefore, the blower 1 of the present invention can generate a greater gas pressure than conventional blowers 1 on the market. In some other special blower 1 air duct configurations, the space of the second region may be smaller than the space of the first region. In this embodiment, the size of the second region is set such that the vertical distance between the bottom plane of the second region away from the impeller 3 and the impeller 3 is greater than or equal to 10 mm (e.g., ...). Figure 5 , Figure 17 (As shown). In other embodiments, this size range may be appropriately varied depending on the overall size of the blower 1, for example, 8 mm or less. The second sheet 3222 is configured to have a similar thickness to the first sheet 3221, and in this embodiment, the ratio of the thickness of the first sheet 3221 to the thickness of the second sheet 3222 ranges from 0.7 to 1.3.

[0096] The blower housing 2 and the impeller 3 can be made of the same or different materials. Furthermore, the second thin plate 3222 and the impeller 3 body can be integrally formed or not integrally formed. In this embodiment, the second thin plate 3222 is separate from the first thin plate 3221, and there is an axial gap between them. The impeller 3 can also be molded using one or more materials.

[0097] Motor 4 includes multiple components such as rotor assembly 41, stator assembly 42, permanent magnet, and bearing 43 (e.g. Figure 21(As shown). Preferably, the motor 4 of the present invention uses an electronic commutator (or microcontroller) to control the switching of current in the coil 423 to achieve continuous rotation of the rotor assembly 41. Compared with a brushless AC motor, the control system of the brushless DC motor 4 is easier to implement. Therefore, in this invention, when it is necessary to control variables such as speed, torque, or position, a brushless DC motor 4 is usually used to provide power to the blower 1 internally. The motor 4 of this invention, with its high efficiency, long life, low noise, high stability, low maintenance requirements, precise control, and miniaturized design, is an ideal choice for the home ventilator field. Its basic working principle is as follows: when one or more phases of the stator 422 are energized, the current passing through the coil 423 generates a magnetic field, and the rotor assembly 41 aligns with the magnetic field; when voltages are applied to different phases in sequence, the rotor assembly 41 will rotate a specific angle and eventually reach the desired position. The rotor assembly 41 is equipped with permanent magnets (made of magnetic materials with high energy product, capable of providing a strong magnetic field), and the stator 422 is equipped with windings (typically made of copper wire with good conductivity and relatively low resistance to prevent short circuits and leakage). The permanent magnets provide a constant magnetic field in the brushless DC motor 4, which interacts with the electromagnetic field generated by the windings on the stator 422 to generate torque to drive the rotor assembly 41 to rotate. In this embodiment, the rotor assembly 41 may be surrounded by windings; in other embodiments, the rotor assembly 41 may also be placed outside the windings (in which case it is referred to as an "externally rotated" brushless DC motor 4). The motor 4 may also have different numbers of windings, the most common being a three-phase brushless DC motor 4. In some other brushless DC motors for appliances such as small cooling fans, there may only be one or two phase windings. The three windings of the motor 4 are usually connected in a "star" or "delta" configuration.

[0098] Particularly noteworthy is that the stator assembly 42 has a stator assembly housing exposed to an air passage providing helical gas flow. This housing is configured to reduce the temperature of the stator assembly when the airflow passes through the air passage; specifically, at least part of the outer surface of the stator assembly housing 42 is exposed to the air passage. Furthermore, it is configured to allow convective cooling of the stator assembly 42 by the airflow when the blower 1 is activated (meaning the airflow path in the air passage passes through the stator assembly 42, and the airflow carries away a portion of the heat from the stator assembly 42). Figure 7 , Figure 10 , Figure 14(As shown). Furthermore, the stator assembly 42 is simultaneously exposed within the air duct of the blower 1 and the external environment not surrounded by the blower housing 2. Here, the external environment refers to the space other than the air duct inside the blower 1 that provides spiral flow of gas. The motor housing 4 internally surrounds the various parts of the motor 4 structure and externally connects to and fixes the blower housing 2. The motor housing 4 is enclosed, and when airflow flows within the air duct inside the blower housing 2, the airflow does not flow through the interior of the stator assembly 42. The motor 4 has flanges for supporting the blower housing 2. A non-integral tube 421 is constructed between the rotor assembly 41 and the stator assembly 42 within the motor housing 4. In this embodiment, the non-integral tube 421 is constructed with two parts, which are separated with a gap inside the blower 1, each rotatably supporting a bearing 43 inside the motor 4, and its dimensions are configured to accommodate the bearing 43. The upper tube 421 and the lower tube 421 may have the same or different dimensions. In some cases, the tube 421 may also be a one-piece tube 421. The rotor assembly 41 and the stator 422 are coaxial and do not form an air gap, that is, the rotor assembly 41 and the tube 421 are tightly fitted together.

[0099] The rotor assembly 41 includes an integral shaft, which is connected to the impeller 3 via a metal component connected to the shaft. That is, the rotor assembly 41 includes a metal component (such as...) that contacts and engages with the impeller 3. Figure 22 (As shown). In some other cases, the shaft of the rotor assembly 41 is divided into two separate parts. In addition, in this embodiment, the stator assembly 42 includes a stator 422 with a central bore and a plurality of coils 423 in a distributed winding configuration, the plurality of coils 423 including a per-phase coil group 423 for a multiphase switched reluctance brushless DC motor 4, the stator 422 including a plurality of protruding stator teeth 4221. The stator 422 comprises a plurality of laminations 4222 and an insulating material 4223 enclosing the laminations 4222. The insulating material 4223 is attached to the surface of the lamination 4222 assembly, insulating the laminations 4222 from the windings (e.g., ...). Figures 23-27 (As shown). In some other cases, the insulating material 4223 may be integrally or non-integrally formed with one or more portions of the laminate 4222. The insulating material 4223 includes, but is not limited to, tetrafluoroethylene (PTFE), polyimide (PI), epoxy resin, silicone rubber, polyvinyl chloride (PVC), polyester (PET), nylon, polycarbonate (PC), polyurethane (PU), etc. These materials have good electrical insulation properties, high temperature resistance, chemical stability, and corrosion resistance, which can effectively protect electrical components from the influence of the external environment, thereby improving the safety and service life of the equipment.

[0100] In some embodiments, the impeller 3 may not have an upper housing 321 (e.g., Figure 18 (As shown).

[0101] In some embodiments, the impeller 3 may not have the second slab 3222 (e.g. Figure 17 (As shown).

[0102] Example 2

[0103] This embodiment relates to a blower 1 providing a pressurization system, configured to pressurize gas to 2cmH2O-40cmH2O and deliver it to the outlet of a respiratory-related device, comprising: a blower housing 2, configured to surround the internal structure of the blower 1 and form an air passage providing a spiral flow of gas, including an inlet 21 and an outlet 22; an impeller 3, including a plurality of blades 31 and at least one housing 32, configured to provide acceleration for the airflow entering the interior of the blower 1 and to radially guide the airflow; and a brushless DC motor 4, including a rotor assembly 41, a stator assembly 42, a permanent magnet, and a bearing 43, the motor 4 having a first side 23 near the blower housing 2 and a second side 24 away from the blower housing 2, the impeller 3 being attached to the first side 23 of the motor 4 via the rotor assembly 41 and driven by the motor 4.

[0104] The air passage space is divided into a first region above the impeller 3 and a second region below the impeller 3, with the impeller 3 as the dividing line. The space of the second region is greater than or equal to the space of the first region.

[0105] In the embodiment of the present invention shown, the difference between the blower 1 in Embodiment 1 and the blower 1 in Embodiment 1 is that the blower 1 is equipped with a Hall sensor. This embodiment adds a Hall sensor to the existing blower 1, enabling the blower 1 to accurately and in real-time monitor its rotational speed, ensuring that the blower 1 operates within the set speed range, thus adding an extra layer of protection to the existing blower 1. The Hall sensor can also provide real-time feedback, allowing the operator to control speed and airflow data more precisely, enabling it to quickly adapt to different environments and work requirements, and enhancing the reliability of the blower 1. Furthermore, the Hall sensor can help the blower 1 avoid over-operation, reducing wear on internal mechanical components, thereby reducing the frequency and cost of subsequent maintenance.

[0106] In addition, the technical features in the above embodiments can be combined as needed to obtain a blower 1 that includes all or some of the above technical features.

[0107] The blower 1 implementing the present invention has at least the following beneficial effects:

[0108] 1) To improve the quietness of blower 1, reduce the impact of breathing-related devices on users, and enhance user comfort, the structure and components of blower 1 were comprehensively improved, tested, verified, and continuously optimized to obtain a blower 1 that is quieter and more comfortable to use than those currently on the market. First, the air duct providing spiral gas flow inside the blower housing 2 was moved downwards relative to the impeller 3, and its space was optimized. Combined with a unique partitioned design of the impeller 3, the internal air duct of blower 1 was optimized. Based on this, the impeller 3 of blower 1 was replaced with a quieter and more efficient closed impeller (an impeller with an upper housing 321 and a lower housing 322), and a uniquely structured motor 4 design was adopted to achieve optimal matching between the impeller 3 and the motor 4. The optimized impeller 3 and motor 4, combined with the improved design of the spiral gas flow air duct inside the blower housing 2, resulted in a significant overall improvement, making the blower 1 designed in this invention more beneficial to the user. These improvements not only enhance the device's quietness but also make it more user-friendly, significantly improving overall product performance and user experience. Specifically, these include several structural and structural improvements and their advantages.

[0109] 2) Designing the impeller 3 as multiple housings 2 has several advantages. For example, a) the impeller 3 has an upper housing 2 and a lower housing 2 that hold multiple blades 31 between them. The blades 31 and the upper and lower housings 2 form a more enclosed impeller 3 channel. This enclosed channel reduces gas leakage from the sides of the impeller 3, more effectively plans the airflow path, and allows the airflow to pass through the impeller 3 more smoothly, reducing turbulence and energy loss. Therefore, the efficiency is higher than that of open and semi-open impellers 3, typically 3% higher. This design also helps improve the overall sealing performance of the blower 1, reducing gas backflow losses, thereby further improving the efficiency and performance of the blower 1. b) Because the upper and lower housings 2 better plan the airflow path, the airflow inside the impeller 3 is smoother, reducing eddies and turbulence, thus lowering the probability of noise generation. Furthermore, the impeller 3 of this invention has greater rigidity, resulting in relatively less vibration during the operation of the blower 1. Furthermore, due to its more robust and symmetrical structure, it exhibits better balance and more stable operation, which is more conducive to noise reduction. c. The impeller 3 of this invention can maintain stable performance under relatively higher gas pressures, mainly because the structure of its upper and lower housings 2 improves its pressure resistance and deformation resistance, ensuring that the impeller 3 of the blower 1 reduces pressure fluctuations under high pressure conditions, thus ensuring stable operation. This advantage is of great significance for breathing-related devices that require repeated pressure changes during operation, enabling them to better cope with various gas pressure variations, making them a more ideal choice for breathing-related devices, and extending the service life of the device.

[0110] 3) The design of the second thin plate 3222 divides the originally integrated internal gas flow channel into two regions. This division brings many advantages that traditional blowers 1 cannot achieve. In the traditional blower 1, gas is drawn into the blower 1 from the inlet, accelerated by the impeller 3, and flows directly out of the blower 1 outlet. The gas flow channel is short, and the high-speed gas leaving the impeller 3 flows directly to the edge of the blower 1 or the vortex tongue that defines the gas flow channel. The small space makes the high-speed gas entering the vortex tongue usually turbulent, resulting in low performance of the blower 1. The turbulent gas at the edge of the impeller 3 and the vortex tongue also introduces new noise sources into the blower 1. In contrast, the present invention designs a second thin plate 3222 below the first thin plate 3221 of the impeller 3. The introduction of this thin plate allows the high-speed gas flowing out of the impeller 3 channel to be smoothly transitioned as it enters the vortex tongue from the first region (i.e., in the second region), reducing the impact of the airflow. The first region allows for high-speed gas flow, while the uniform gap between the second thin plate 3222 and the inner surface of the blower housing 2 allows the airflow to be uniformly directed to the lower second region. This eliminates (or significantly reduces) the edge effects that generate turbulence. Furthermore, the space of the second region is designed to be greater than or equal to that of the first region. In particular, when the space of the second region is larger than that of the first region, the increased volume slows down the gas velocity and increases the gas pressure as the airflow enters from the first region. This reduced gas velocity not only reduces turbulence but also allows the blower 1 of this invention to operate over a wider range of pressures compared to other blowers 1, and significantly reduces existing noise levels. Since the diameter of the second thin plate 3222 is larger than that of the first thin plate 3221, this structure effectively prevents gas backflow, further reducing noise and thus improving the overall performance and quietness of the blower 1. The division into two regions also increases the airflow channel, offering advantages such as reduced impact, lower noise, and improved efficiency.

[0111] 4) Lowering the air duct to the middle of the blower 1 has several advantages: a. Lowering the air duct within the blower 1 to the middle of the blower 1 assembly allows the airflow entering the blower 1 assembly to pass through the motor 4, thus carrying away the heat generated by the motor 4's operation. This helps dissipate heat from the motor 4 and keeps it operating within a suitable temperature range, preventing overheating from prolonged use and improving the motor 4's efficiency and lifespan, thereby improving the efficiency and lifespan of the blower 1 assembly. b. In existing market designs, the air duct of the blower 1 assembly is located at the impeller 3. This design causes the airflow, immediately pressurized by the impeller 3, to enter the air duct and be output. The sudden and rapid change in airflow at the impeller 3 and air duct may lead to turbulence or irregular flow, increasing the noise of the blower 1 assembly. Furthermore, this sudden change may cause airflow oscillation, further exacerbating the noise problem. In contrast, lowering the air duct to the central position of the blower 1 assembly provides a buffer space for the newly pressurized airflow, allowing it to flow more smoothly and evenly along the air duct path. This reduces turbulence and irregular flow within the blower 1 assembly, thus reducing noise. c. Combined with the function of the second thin plate 3222, the originally integrated air duct providing spiral gas flow is divided into a flow path from the first region to the second region. The lowered air duct increases the previously limited space, allowing the second thin plate 3222 to fully utilize its efficiency and providing a more optimized flow path for the airflow. By lowering the air duct, the airflow transitions more smoothly in the second region, avoiding abrupt changes in airflow due to space constraints, thus reducing turbulence and lowering the noise of the blower 1. This improvement also optimizes the aerodynamic performance of the entire air duct, enhancing the efficiency and stability of the blower 1, maximizing the noise reduction effect of the second thin plate 3222, and achieving a quieter and more efficient operation of the blower 1. d. When the blower assembly 1 uses a closed impeller 3, unlike a non-closed impeller 3, its blades 31 are enclosed within a closed housing 2. The impeller 3 has a central opening 33, through which airflow enters and passes through the impeller 3 flow channel formed by the blades 31, allowing it to exit at higher pressure from the relatively enclosed structure. Non-closed impellers 3, on the other hand, have a more open structure, allowing airflow to flow freely on both sides of the impeller 3 without much path restriction. Therefore, blower 1 assemblies using closed impellers 3 require a lower airflow channel to provide more space for the integration and guidance of pressurized airflow, improving the performance and efficiency of the blower assembly 1. e. Designing the airflow channel at the center of the blower assembly 1 also benefits the stability of the blower assembly 1 within the breathing device. Existing market blower 1 assemblies have their internal airflow channel located at the top, while this invention moves it downwards, meaning the overall center of gravity of the blower assembly 1 also shifts downwards, moving towards the center of the blower assembly 1.This method reduces mechanical vibration caused by changes in airflow pressure and velocity, further improving the smoothness and safety of blower 1's operation. It also helps the bracket to fix the blower 1 assembly more stably and without shaking inside the breathing equipment, reducing some of the noise from motor 4.

[0112] 5) In addition to the structural improvements mentioned above, improvements were also made to the motor 4. The most significant improvement was the use of insulating material 4223 to wrap the laminated plates 4222, preventing the coils 423 from directly contacting the laminated plates 4222. The advantages of this method are mainly as follows: a. The form of wrapping the insulating material 4223 around the motor 4 enhances the electrical insulation and reduces electromagnetic interference. The insulating material 4223 effectively prevents electrical short circuits between the laminated plates 4222 and other components of the motor 4, and prevents accidental current flow between different windings or between the windings and the motor 4 housing 32. The insulating material 4223 also suppresses magnetic leakage within the motor 4, reducing electromagnetic interference. The insulating material 4223 not only improves the electromagnetic compatibility of the motor 4 but also reduces the electromagnetic noise that may be generated during motor 4 operation, further reducing the noise of the blower 1 from the perspective of the motor 4. b. This structural improvement also improves the thermal management and heat dissipation of the motor 4. The insulating material 4223 has excellent thermal conductivity. Although it is wrapped around the laminations 4222, it effectively transfers heat from the windings to the motor housing. Combined with airflow for heat dissipation from the motor housing, this significantly improves the motor's heat dissipation efficiency, thus extending its service life. c. Improved Motor Durability. The insulation material 4223 effectively prevents damage to the laminations 4222 from external factors or other adverse environments, reducing aging or performance degradation caused by environmental factors. This structure also simplifies installation and maintenance, avoiding safety hazards caused by exposed laminations 4222, thereby reducing motor failures and extending its service life. Furthermore, the insulation material 4223 provides additional mechanical protection for the laminations 4222, preventing damage from physical impacts, vibrations, or other stresses, helping to maintain the structural integrity and long-term reliability of the motor.

Claims

1. A blower providing a pressurization system, configured to pressurize gas to 2cmH2O-40cmH2O and deliver it to the outlet of a respiratory-related device, characterized in that, The blower includes: The blower housing is constructed to surround the internal structure of the blower and to form an air passage that provides a spiral flow of gas, including an air inlet and an air outlet. An impeller, comprising multiple blades and at least one housing, is configured to provide acceleration to the airflow entering the interior of the blower and to guide the airflow radially; A brushless DC motor includes a rotor assembly, a stator assembly, a permanent magnet, and bearings. The motor has a first side close to the blower housing and a second side away from the blower housing. The impeller is attached to the first side of the motor via the rotor assembly and is driven by the motor. The air passage space is divided into a first region above the impeller and a second region below the impeller, with the impeller as the dividing line. The space of the second region is greater than or equal to the space of the first region. Wherein, at least 50% of the air outlet is configured to be in the second region; Wherein, the vertical distance between the bottom plane of the second region furthest from the impeller and the impeller is greater than or equal to 10 mm.

2. The blower according to claim 1, characterized in that, The blower housing comprises at least two components configured to join together to form a complete blower housing.

3. The blower according to claim 1, characterized in that, The stator assembly has a stator assembly housing that is exposed to a gas duct that provides a helical flow of gas and is configured to reduce the temperature of the stator assembly when the gas flows through the duct.

4. The blower according to claim 3, characterized in that, The stator assembly is simultaneously exposed within the blower's air duct and to the external environment not enclosed by the blower housing.

5. The blower according to claim 1, characterized in that, The impeller has a central opening, and the blower inlet restricts the central opening of the impeller.

6. The blower according to claim 1, characterized in that, The impeller is coaxially aligned with the blower casing.

7. A blower providing a pressurization system, configured to pressurize gas to 2cmH2O-40cmH2O and deliver it to the outlet of a respiratory-related device, characterized in that, The blower includes: The blower housing is constructed to surround the internal structure of the blower and to form an air passage that provides a spiral flow of gas, including an air inlet and an air outlet. An impeller includes a plurality of blades and at least one housing, wherein the housing includes at least an upper housing and a lower housing, the upper housing and the lower housing clamping the plurality of blades and forming a plurality of impeller channels, the impeller being configured to provide acceleration to airflow entering the interior of a blower and to guide the airflow radially through the plurality of impeller channels; A brushless DC motor includes a rotor assembly, a stator assembly, a permanent magnet, and bearings. The motor has a first side close to the blower housing and a second side away from the blower housing. The impeller is attached to the first side of the motor via the rotor assembly and is driven by the motor. The air passage space is divided into a first region above the impeller and a second region below the impeller, with the impeller as the dividing line. The space of the second region is greater than or equal to the space of the first region. In this configuration, at least 50% of the air outlet is located in the second region.

8. The blower according to claim 7, characterized in that, The upper housing of the impeller includes a protrusion at the central opening.

9. The blower according to claim 7, characterized in that, The upper housing is gradually offset downwards in the radial direction relative to the axial direction.

10. The blower according to claim 7, characterized in that, The impeller has a central opening configured as an inlet for airflow into the impeller channel, and the height of each blade gradually decreases from the central opening to the periphery of the impeller.

11. The blower according to claim 10, characterized in that, Each blade forms an angle with the lower shell at the edge of its central opening, and the angle is less than 90°.

12. The blower according to claim 7, characterized in that, The vertical distance between the bottom plane of the second region furthest from the impeller and the lower housing is greater than or equal to 10 mm.

13. A blower providing a pressurization system, configured to pressurize gas to 2 cmH2O-40 cmH2O and deliver it to the outlet of a respiratory-related device, characterized in that, The blower includes: The blower housing is constructed to surround the internal structure of the blower and to form an air passage that provides a spiral flow of gas, including an air inlet and an air outlet. An impeller includes a plurality of blades and at least one housing, wherein the housing includes at least an upper housing and a lower housing, the upper housing and the lower housing clamping the plurality of blades and forming a plurality of impeller channels, the impeller being configured to provide acceleration to airflow entering the interior of a blower and to guide the airflow radially through the plurality of impeller channels; A brushless DC motor includes a rotor assembly, a stator assembly, a permanent magnet, and bearings. The motor has a first side close to the blower housing and a second side away from the blower housing. The impeller is attached to the first side of the motor via the rotor assembly and is driven by the motor. The lower housing includes a first sheet and a second sheet, which are arranged coaxially. The air passage space is divided into a first region above the impeller and a second region below the impeller, with the impeller as the dividing line. The first region and the second region form a gas flow through the gap between the second thin plate and the blower housing. The airflow flows at high speed through the impeller channel in the first region and then enters the second region to buffer the airflow.

14. The blower according to claim 13, characterized in that, The diameter of the second sheet is larger than the diameter of the first sheet.

15. The blower according to claim 13, characterized in that, A gap is formed between the second sheet and the blower housing, and the gap is evenly distributed on the outer periphery of the second sheet, configured so that the airflow flows evenly from the first region to the second region.

16. The blower according to claim 13, characterized in that, The ratio of the thickness of the first sheet to the thickness of the second sheet is in the range of 0.7-1.

3.

17. The blower according to claim 13, characterized in that, The space of the second region is greater than or equal to the space of the first region.

18. The blower according to claim 13, characterized in that, The space of the second region is smaller than the space of the first region.

19. A blower providing a pressurization system, configured to pressurize gas to 2 cmH2O-40 cmH2O and deliver it to the outlet of a respiratory-related device, characterized in that, The blower includes: The blower housing is constructed to surround the internal structure of the blower and to form an air passage that provides a spiral flow of gas, including an air inlet and an air outlet. An impeller, comprising multiple blades and at least one housing, is configured to provide acceleration to the airflow entering the interior of the blower and to guide the airflow radially; A brushless DC motor includes a rotor assembly, a stator assembly, a permanent magnet, and bearings. The motor has a first side close to the blower housing and a second side away from the blower housing. The impeller is attached to the first side of the motor via the rotor assembly and is driven by the motor. The stator assembly has a stator assembly housing, the outer surface of which is at least partially exposed in the air passage and is configured to allow airflow to convectively cool the stator assembly when the blower is in operation. Among them, a non-integral tube is constructed between the rotor assembly and the stator assembly; The stator assembly includes a stator with a central hole and multiple coils in a distributed winding configuration, the multiple coils including a per-phase coil group for a multiphase switched reluctance brushless DC motor, and the stator including multiple protruding stator teeth. The stator comprises multiple laminations and insulating material that wraps the laminations.

20. The blower according to claim 21, characterized in that, The non-integral tube is constructed to have two parts, which are separated by a gap inside the blower.

21. The blower according to claim 21, characterized in that, The motor has a flange for supporting the blower housing.

22. The blower according to claim 21, characterized in that, The rotor assembly includes metal parts that are in contact with and locked into the impeller.

23. The blower according to claim 18, characterized in that, The rotor assembly is coaxial with the stator and does not form an air gap.

24. The blower according to claim 13, characterized in that, Airflow does not pass through the interior of the stator assembly.

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