Main machine structure for breathing machine and breathing machine

Abstract

The utility model relates to a main machine structure for a breathing machine and the breathing machine. The main machine structure comprises the lower shell, the isolation sleeve and the upper shell, the draught fan is borne through the bearing face, the draught fan can be separated from the bottom wall of the lower shell, the isolation face is arranged on the bearing face in a surrounding mode so that the draught fan can be separated from the side wall of the lower shell, and therefore the risk that the draught fan collides with the lower shell due to vibration during operation is reduced, and the noise reduction effect is achieved; and the service life of the fan is prolonged. Meanwhile, the air outlet pipe is further arranged between the air outlet of the fan and the first inner wall of the lower shell, on one hand, the air flow of the air outlet of the fan is guided to the air outlet cavity of the lower shell through the air outlet pipe, the flowing path of the air flow can be effectively restrained and prolonged, and noise generated when air flows is dispersed; and on the other hand, vibration generated at the air outlet of the fan can be isolated and filtered through the air outlet pipe, and noise generated by vibration is reduced.

Description

Technical Field

[0001] This application relates to the field of ventilator technology, and in particular to the main structure of a ventilator and a ventilator. Background Technology

[0002] A ventilator is a device that can assist or replace a person's breathing, increase lung ventilation, and improve respiratory function. It is generally used for patients with lung failure or airway obstruction who are unable to breathe normally.

[0003] A ventilator consists of a main unit that draws in air using an internal fan and then delivers it to the user via a humidifier. For ease of use, ventilators are typically placed next to the user; therefore, the quiet operation of the ventilator is a crucial factor in determining the user experience.

[0004] In related technologies, ventilators generate significant noise during operation, which affects the user experience. Utility Model Content

[0005] Therefore, it is necessary to provide a main unit structure for ventilators to address the problem of excessive noise in existing ventilators.

[0006] A main unit structure for a ventilator, the main unit structure for the ventilator comprising:

[0007] The lower housing has a first inner wall that encloses a first mounting cavity; the lower housing also has an air outlet cavity spaced apart from the first mounting cavity.

[0008] An isolation sleeve is disposed in the first mounting cavity. The isolation sleeve has a bearing surface for supporting the fan and an isolation surface surrounding the bearing surface. The isolation surface is used to isolate the fan from the first inner wall. An air outlet pipe is disposed between the isolation surface and the first inner wall. The inlet of the air outlet pipe is connected to the air outlet of the fan. The outlet of the air outlet pipe is connected to the air outlet cavity.

[0009] The upper housing is connected to the lower housing to enclose the first mounting cavity.

[0010] In one embodiment, a gap exists between the bearing surface and the bottom of the first inner wall; and / or,

[0011] At least a portion of the isolation surface is in contact with the outer peripheral surface of the fan.

[0012] In one embodiment, the first inner wall is provided with a first positioning part, and the isolation sleeve is provided with a first mating part. Both the first positioning part and the first mating part extend in a vertical direction; a portion of the first positioning part is used to engage with the first mating part.

[0013] In one embodiment, there are multiple first positioning portions and multiple first mating portions; and / or,

[0014] One of the first positioning part and the first mating part is provided with a first snap-fit ​​protrusion, and the other is provided with a first snap-fit ​​groove for snapping with the first snap-fit ​​protrusion.

[0015] In one embodiment, the first inner wall is provided with a first mounting hole, and the air outlet pipe is connected to the wall of the first mounting hole.

[0016] In one embodiment, one of the hole wall of the first mounting hole and the outer peripheral surface of the air outlet pipe is provided with a first limiting protrusion, and the other is provided with a first limiting groove for engaging with the first limiting protrusion.

[0017] In one embodiment, the lower housing has a second inner wall surrounding at least two air inlet chambers, one of which is connected to the air inlet of the fan.

[0018] In one embodiment, the main unit structure for the ventilator further includes a seal connected between the lower housing and the upper housing to seal the air inlet chamber and the air outlet chamber.

[0019] In one embodiment, the seal is configured with an extension projecting toward the upper housing, the extension for accommodating a portion of the fan, the extension for isolating the fan from the upper housing; and / or,

[0020] One of the seal and the upper housing is provided with a second engaging protrusion, and the other is provided with a second engaging groove for engaging with the second engaging protrusion; and / or,

[0021] One of the lower housing, the seal, and the upper housing is provided with a positioning post, and the other two are provided with positioning holes for insertion into the positioning post.

[0022] A ventilator includes a main unit structure for a ventilator as described above.

[0023] The aforementioned main unit structure for a ventilator uses a bearing surface to support the fan, separating the fan from the bottom wall of the lower casing. An insulating surface surrounding the bearing surface further isolates the fan from the side wall of the lower casing, reducing the risk of the fan colliding with the lower casing due to vibration during operation, thus achieving noise reduction and extending the fan's lifespan. Simultaneously, an air outlet duct is installed between the fan's outlet and the first inner wall of the lower casing. On one hand, the airflow from the fan's outlet is guided to the air outlet chamber of the lower casing through the air outlet duct, effectively constraining and extending the airflow path and dispersing noise generated during gas flow. On the other hand, vibrations generated at the fan's outlet can be filtered and isolated by the air outlet duct, reducing noise caused by vibration. Attached Figure Description

[0024] Figure 1 This is an exploded view of the main unit structure of a ventilator provided in an embodiment of this application.

[0025] Figure 2 for Figure 1 The diagram shown is a schematic of the lower housing in the main unit structure of a ventilator.

[0026] Figure 3 for Figure 1 The diagram shows the lower housing and isolation sleeve in the main unit structure of a ventilator.

[0027] Figure 4 for Figure 3 The diagram shows a partial schematic of the main unit structure used in a ventilator.

[0028] Reference numerals: 100, lower housing; 110, first inner wall; 111, first mounting cavity; 112, first positioning part; 1121, first snap-fit ​​protrusion; 113, first mounting hole; 120, second inner wall; 121, air inlet cavity; 122, air outlet cavity; 130, positioning post; 140, air resistance element; 200, isolation sleeve; 210, bearing surface; 220, isolation surface; 230, air outlet pipe; 231, first limiting protrusion; 240, first mating part; 300, sealing element; 310, second snap-fit ​​protrusion; 320, positioning hole; 330, extension part; 400, upper housing; 410, second snap-fit ​​groove. Detailed Implementation

[0029] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0030] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0031] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0032] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0033] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0034] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0035] A ventilator is a device that assists or replaces breathing, increases lung ventilation, and improves respiratory function. It is generally used for patients with lung failure or airway obstruction who are unable to breathe normally. A ventilator consists of a main unit that draws in air via a fan and then delivers it to the user through a humidifier. For ease of use, ventilators are usually placed beside the user; therefore, the quietness of operation is a crucial factor in the user experience. The fan, as the power component within the ventilator, generates vibrations during operation. If these vibrations are directly transmitted to the outer casing, they not only increase noise and affect the user experience but may also affect the operational stability of other precision components inside the device, thus impacting the ventilator's lifespan.

[0036] Based on this, one embodiment of this application provides a main unit structure for use in a ventilator, which can achieve good vibration reduction and noise reduction effects. The main unit structure provided in one embodiment of this application will be described in detail below with reference to the accompanying drawings.

[0037] Figure 1 An exploded view of the main unit structure of a ventilator provided in an embodiment of this application; Figure 2 for Figure 1 The diagram shown is a schematic of the lower housing in the main unit structure of a ventilator; Figure 3 for Figure 1 The diagram shows the lower housing and isolation sleeve in the main unit structure of a ventilator; Figure 4 for Figure 3 The diagram shows a partial schematic of the main unit structure used in a ventilator. (See attached image.) Figures 1 to 4As shown, an embodiment of this application provides a main unit structure for a ventilator, including a lower housing 100, an isolation sleeve 200, and an upper housing 400; the lower housing 100 has a first inner wall 110, which surrounds a first mounting cavity 111; the lower housing 100 also has an air outlet cavity 122 spaced apart from the first mounting cavity 111; the isolation sleeve 200 is disposed in the first mounting cavity 111, and the isolation sleeve 200 has a bearing surface 210 for bearing a fan (not shown) and an isolation surface 220 surrounding the bearing surface 210, the isolation surface 220 is used to isolate the fan and the first inner wall 110; an air outlet pipe 230 is disposed between the isolation surface 220 and the first inner wall 110, the inlet of the air outlet pipe 230 is connected to the air outlet of the fan; the outlet of the air outlet pipe 230 is connected to the air outlet cavity 122; the upper housing 400 is connected to the lower housing 100 to close the first mounting cavity 111.

[0038] The aforementioned main unit structure for the ventilator, with the fan supported by the bearing surface 210, separates the fan from the bottom wall of the lower housing 100. An isolation surface 220 surrounds the bearing surface 210, further isolating the fan from the side wall of the lower housing 100. This reduces the risk of the fan colliding with the lower housing 100 due to vibration during operation, thus achieving noise reduction and extending the fan's lifespan. Simultaneously, an air outlet duct 230 is provided between the fan's outlet and the first inner wall 110 of the lower housing 100. On one hand, the airflow from the fan's outlet is guided to the air outlet chamber 122 of the lower housing 100 via the air outlet duct 230, effectively constraining and extending the airflow path and dispersing noise generated during gas flow. On the other hand, vibrations generated at the fan's outlet can be filtered out by the air outlet duct 230, reducing noise caused by vibration.

[0039] In some embodiments, the isolation sleeve 200 and the air outlet duct 230 can be made of flexible materials such as soft rubber. Soft rubber has good elasticity and can effectively absorb and isolate vibrations generated during fan operation, thereby reducing vibrations transmitted to the main unit casing, lowering the overall noise level, and providing better vibration damping for the fan. By reducing the impact of vibration on the overall structure of the equipment, the service life of various components, especially electronic and mechanical components, can be extended. Simultaneously, the isolation sleeve 200 can also provide a certain degree of sealing, preventing external contaminants such as dust and moisture from entering the equipment, protecting the fan and other sensitive components from damage.

[0040] See Figures 1 to 4As shown, in one embodiment, there is a gap between the bearing surface 210 and the bottom of the first inner wall 110. That is, the bottom of the fan is suspended relative to the lower housing 100, allowing more space within the lower housing 100 to allow more cool air to enter and remove heat, thus improving the overall system's heat dissipation efficiency. This ensures that the fan and other critical components (such as circuit boards) operate within a safe temperature range, preventing functional failure or damage due to overheating. Simultaneously, the sound generated by the fan during operation can amplify noise if it resonates with the housing or other hardware. By suspending the fan, this potential resonance can be broken, further reducing unnecessary noise interference. Furthermore, when the fan needs repair or replacement, it is easier to disassemble and reinstall since it is not directly fixed to the lower housing 100, reducing maintenance difficulty and time costs.

[0041] See Figures 1 to 4 As shown, in one embodiment, at least a portion of the isolation surface 220 is bonded to the outer peripheral surface of the fan. For example, in the embodiment shown in the figures, the isolation surface 220 is cylindrical, thus completely bonding to the outer peripheral surface of the fan. This tight bonding between the isolation surface 220 and the outer peripheral surface of the fan forms an effective sealing layer, preventing external contaminants such as dust and moisture from entering the equipment and protecting the fan and other critical components from damage. Simultaneously, it reduces the risk of gas leakage, ensuring airflow follows a predetermined path and avoiding impact on the fan's operating efficiency. Furthermore, it reduces unnecessary energy loss, enabling the fan to achieve the expected airflow output with lower energy consumption, thus improving the overall energy efficiency ratio of the equipment. Additionally, the design of the isolation sleeve 200 bonded to the fan provides extra support, evenly distributing the pressure generated during fan operation, avoiding localized stress concentration, and further extending the service life of the equipment.

[0042] See Figures 1 to 4 As shown, in one embodiment, the first inner wall 110 is provided with a first positioning part 112, and the isolation sleeve 200 is provided with a first mating part 240. Both the first positioning part 112 and the first mating part 240 extend vertically. A portion of the first positioning part 112 is used to engage with the first mating part 240. The first mating part 240 is located on the radially outer side of the isolation sleeve 200. The engagement between the portion of the first positioning part 112 and the first mating part 240 allows the isolation sleeve 200 to be suspended relative to the lower housing 100, reducing unnecessary noise interference. The isolation sleeve 200 also supports the fan; therefore, when maintenance or replacement of the fan is required, since the fan is not directly fixed to the lower housing 100, it is easier to disassemble and reinstall, reducing maintenance difficulty and time costs. Understandably, the first mating part 240 can be made of a flexible material such as silicone ribs. Silicone material has good elasticity and can effectively absorb and isolate vibrations generated during fan operation.

[0043] See Figures 1 to 4 As shown, in one embodiment, there are multiple first positioning parts 112 and multiple first mating parts 240. By providing multiple first positioning parts 112 and multiple first mating parts 240, on the one hand, the connection area between the isolation sleeve 200 and the lower housing 100 can be increased, improving the connection effect between the two; on the other hand, the support capacity of the lower housing 100 for the isolation sleeve 200 can be distributed more evenly, which can evenly disperse the pressure generated during the operation of the fan, avoid local stress concentration, and further extend the service life of the equipment. In the embodiment shown in the figure, five first positioning parts 112 are provided. In other embodiments, the number of first positioning parts can be two, three, four, etc., which can be set according to actual needs.

[0044] See Figures 1 to 4 As shown, one of the first positioning part 112 and the first mating part 240 is constructed with a first engaging protrusion 1121, and the other is constructed with a first engaging groove for engaging with the first engaging protrusion 1121. For example, in the embodiment shown in the figure, the first positioning part 112 is constructed with a first engaging protrusion 1121 protruding towards the first mating part 240, and the first mating part 240 is constructed with a first engaging groove. Through the engaging engagement of the two, the connection between the isolation sleeve 200 and the lower housing 100 is realized, and the isolation sleeve 200 and the fan are suspended and fixed. The first positioning part 112 can be a positioning protrusion, and the first mating part 240 can be a non-through sleeve structure with an open lower end and a closed upper end, so that it can be fitted onto the positioning protrusion. It can be understood that in other embodiments, the positions of the first engaging part and the first engaging groove can be interchanged, that is, the first positioning part is constructed as the first engaging groove, and the first mating part is constructed as the first engaging protrusion protruding towards the first positioning part.

[0045] See Figures 1 to 4 As shown, in one embodiment, the first inner wall 110 is provided with a first mounting hole 113, and the air outlet pipe 230 is connected to the wall of the first mounting hole 113. Fixing the air outlet pipe 230 through the first mounting hole 113 in the first inner wall 110 supports the suspended air outlet pipe 230, ensuring the reliability of guiding the airflow from the fan outlet to the air outlet chamber 122, thereby isolating and filtering noise at the fan outlet. The air outlet pipe 230 can partially extend into the air outlet chamber 122 of the lower housing 100, or it can be flush with the wall of the first mounting hole 113.

[0046] See Figures 1 to 4As shown, in one embodiment, one of the walls of the first mounting hole 113 and the outer peripheral surface of the air outlet duct 230 is provided with a first limiting protrusion 231, and the other is provided with a first limiting groove for engaging with the first limiting protrusion 231. For example, in the embodiment shown in the attached figure, the outer peripheral surface of the air outlet duct 230 is provided with an outwardly protruding first limiting protrusion 231, and correspondingly, the wall of the first mounting hole 113 is provided with a first limiting groove. Through the engaging cooperation of the first limiting protrusion 231 and the first limiting groove, the air outlet duct 230 is fixed to the first inner wall 110, while improving the connection effect between the two, ensuring the reliability of the fixing of each component, and facilitating the installation and disassembly of the air outlet duct 230. In other embodiments, the position of the first limiting protrusion can be interchanged with the position of the first limiting groove, that is, the outer peripheral surface of the air outlet duct is provided with a first limiting groove, and the wall of the first mounting hole is provided with a first limiting protrusion protruding towards the air outlet duct, etc.

[0047] See Figures 1 to 4 As shown, in one embodiment, the lower housing 100 has a second inner wall 120 surrounding at least two air inlet chambers 121, one of which is connected to the air inlet of a fan. Airflow passes sequentially through the two air inlet chambers 121, enters the fan air inlet, then passes through the fan air outlet to the air outlet 230, and finally enters the air outlet chamber 122. Understandably, the two air inlet chambers 121 are interconnected. By providing at least two air inlet chambers 121, the gas flow path is effectively extended, thereby increasing the gas flow time and further dispersing the noise generated during gas flow, achieving a better noise reduction effect. In some embodiments, the air outlet chamber 122 and the at least two air inlet chambers 121 are arranged circumferentially along the isolation sleeve 200, meaning that the airflow within the lower housing 100 presents a ring-shaped flow, further extending the flow path and improving the noise reduction effect.

[0048] In some embodiments, an air resistance element 140 is provided within the air intake chamber 121. The air resistance element 140 operates according to preset parameters to ensure that the airflow entering the patient's airway meets treatment needs while maintaining a natural breathing sensation. For example, in pressure support ventilation mode, the air resistance element 140 automatically adjusts its resistance according to the patient's inspiratory capacity, making each breath as close as possible to a normal physiological state. This allows for precise adjustment of the gas flow rate entering the patient's airway to adapt to the treatment needs of different patients. Furthermore, the air resistance element 140 can limit abnormally high pressure in the system, preventing damage to the patient's lungs. Simultaneously, it can reduce unnecessary high airflow velocities, helping to reduce the workload of the fan, thereby reducing operating noise and improving the patient's resting environment.

[0049] See Figure 1As shown, in one embodiment, the main unit structure for the ventilator also includes a seal 300, which is connected between the lower housing 100 and the upper housing 400 to isolate the air inlet chamber 121 and the air outlet chamber 122 from the outside, thereby sealing the air inlet chamber 121 and the air outlet chamber 122. This improves the sealing effect of the main unit structure, preventing external contaminants such as dust and moisture from entering the device and protecting the fan and other sensitive components from damage. The seal 300 can be made of a flexible material such as soft rubber; the elasticity of the soft rubber can effectively absorb and buffer the vibrations generated during fan operation, reducing the overall noise level.

[0050] See Figures 1 to 4 As shown, in one embodiment, the seal 300 is configured with an extension 330 protruding toward the upper housing 400. The extension 330 is used to accommodate a portion of the fan and to isolate the fan from the upper housing 400. That is, the lower part of the fan is housed within the isolation sleeve 200, and the upper part of the fan is housed within the extension 330. The isolation sleeve 200 isolates the fan from the lower housing 100, reducing the risk of the fan colliding with the lower housing 100 due to vibration during operation. The seal 300 isolates the fan from the upper housing 400, reducing the risk of the fan colliding with the lower housing 100 due to vibration during operation. The extension 330 isolates the upper housing 400 and the upper part of the fan, thereby improving the noise reduction effect of the ventilator.

[0051] See Figures 1 to 4 As shown, in one embodiment, one of the seal 300 and the upper housing 400 is provided with a second engaging protrusion 310, and the other is provided with a second engaging groove 410 for engaging with the second engaging protrusion 310. For example, in the embodiment shown in the figures, the seal 300 is provided with a second engaging protrusion 310 protruding towards the upper housing 400, and the upper housing 400 is provided with a second engaging groove 410. The engagement and fixation of the second engaging protrusion 310 and the second engaging groove 410 improves the connection effect between the seal 300 and the upper housing 400. In other embodiments, the positions of the second engaging protrusion and the second engaging groove can be interchanged, that is, the second engaging protrusion is provided on the upper housing, and the second engaging groove is provided on the seal.

[0052] See Figure 1As shown, one of the lower housing 100, the seal 300, and the upper housing 400 is equipped with a positioning post 130, while the other two are equipped with positioning holes 320 for insertion into the positioning post 130. For example, in the embodiment shown in the attached figure, the lower housing 100 is equipped with the positioning post 130, and the corresponding positions of the seal 300 and the upper housing 400 are equipped with positioning holes 320. Through the insertion and engagement of the positioning post 130 and the positioning holes 320, a detachable connection is achieved between the upper housing 400, the seal 300, and the lower housing 100. In other embodiments, the seal may be equipped with a positioning post, and the upper and lower housings may be equipped with positioning holes to achieve the connection of the three components.

[0053] Furthermore, one embodiment of this application also provides a ventilator (not shown), including the main unit structure for a ventilator according to any embodiment. Because this ventilator includes the aforementioned main unit structure, the fan and lower housing 100 can be separated by the isolation sleeve 200, reducing the risk of the fan colliding with the lower housing 100 due to vibration during operation, thereby achieving noise reduction and improving the fan's service life. Simultaneously, an air outlet duct 230 is provided between the fan's air outlet and the first inner wall 110 of the lower housing 100. On one hand, the airflow from the fan's air outlet is guided to the air outlet chamber 122 of the lower housing 100 through the air outlet duct 230, effectively constraining and extending the airflow path and dispersing the noise generated during gas flow; on the other hand, vibrations generated at the fan's air outlet can be filtered out by the air outlet duct 230, reducing noise caused by vibration. Understandably, this ventilator also includes components such as a humidifier for heating and humidifying the inhaled gas; specific details can be found in the prior art and will not be elaborated here.

[0054] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0055] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A main unit structure for a ventilator, characterized in that, The main unit structure for the ventilator includes: The lower housing (100) has a first inner wall (110) that encloses a first mounting cavity (111); the lower housing (100) is also provided with an air outlet cavity (122) spaced apart from the first mounting cavity (111). An isolation sleeve (200) is disposed in the first mounting cavity (111). The isolation sleeve (200) has a bearing surface (210) for supporting the fan and an isolation surface (220) surrounding the bearing surface (210). The isolation surface (220) is used to isolate the fan from the first inner wall (110). An air outlet pipe (230) is disposed between the isolation surface (220) and the first inner wall (110). The inlet of the air outlet pipe (230) is connected to the air outlet of the fan. The outlet of the air outlet pipe (230) is connected to the air outlet cavity (122). The upper housing (400) is connected to the lower housing (100) to close the first mounting cavity (111).

2. The main unit structure for a ventilator according to claim 1, characterized in that, There is a gap between the bearing surface (210) and the bottom of the first inner wall (110); and / or, At least a portion of the isolation surface (220) is in contact with the outer peripheral surface of the fan.

3. The main unit structure for a ventilator according to claim 1, characterized in that, The first inner wall (110) is provided with a first positioning part (112), and the isolation sleeve (200) is provided with a first mating part (240). Both the first positioning part (112) and the first mating part (240) extend in the vertical direction; a portion of the first positioning part (112) is used to engage with the first mating part (240).

4. The main unit structure for a ventilator according to claim 3, characterized in that, The number of the first positioning part (112) and the first mating part (240) are both multiple; and / or, One of the first positioning part (112) and the first mating part (240) is provided with a first snap-fit ​​protrusion (1121), and the other is provided with a first snap-fit ​​groove for snapping with the first snap-fit ​​protrusion (1121).

5. The main unit structure for a ventilator according to claim 1, characterized in that, The first inner wall (110) is provided with a first mounting hole (113), and the air outlet pipe (230) is connected to the wall of the first mounting hole (113).

6. The main unit structure for a ventilator according to claim 5, characterized in that, One of the hole wall of the first mounting hole (113) and the outer peripheral surface of the air outlet pipe (230) is provided with a first limiting protrusion (231), and the other is provided with a first limiting groove for engaging with the first limiting protrusion (231).

7. The main unit structure for a ventilator according to claim 1, characterized in that, The lower housing (100) has a second inner wall (120) surrounding at least two air inlet chambers (121), one of which is connected to the air inlet of the fan.

8. The main unit structure for a ventilator according to claim 7, characterized in that, The main structure for the ventilator also includes a seal (300) connected between the lower housing (100) and the upper housing (400) to seal the air inlet chamber (121) and the air outlet chamber (122).

9. The main unit structure for a ventilator according to claim 8, characterized in that, The seal (300) is configured with an extension (330) protruding toward the upper housing (400), the extension (330) for accommodating a portion of the fan, the extension (330) for isolating the fan from the upper housing (400); and / or, One of the seal (300) and the upper housing (400) is provided with a second engaging protrusion (310), and the other is provided with a second engaging groove (410) for engaging with the second engaging protrusion (310); and / or, One of the lower housing (100), the seal (300) and the upper housing (400) is provided with a positioning post (130), and the other two are provided with positioning holes (320) for insertion into the positioning post (130).

10. A ventilator, characterized in that, Includes the main unit structure for a ventilator as described in any one of claims 1 to 9.

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