Single-cylinder nasal aspirator

Abstract

The utility model relates to the field of nasal aspirators, in particular to a single-barrel nasal aspirator which comprises an aspiration assembly, a connecting pipe and an air exhaust mechanism. The air exhaust mechanism comprises a cylinder body, a piston and an umbrella-shaped valve, at least one air exchange channel is formed in the lower end of the cylinder body, one end of the umbrella-shaped valve penetrates through the cylinder body and is provided with a flexible valve plate extending outwards, the flexible valve plate covers the outer side of the air exchange channel, the piston moves upwards for air exhaust, and the flexible valve plate is attached to the air exchange channel under the action of external air pressure. The ventilation channel is sealed, it is guaranteed that air can stably enter the air exhaust mechanism through the suction assembly and the connecting pipe, and the good suction effect is guaranteed; the piston moves downwards for ventilation, and internal air pressure pushes the flexible valve plate to be separated from the ventilation channel, so that most of air flows out of the barrel body through the ventilation channel, a small part of air enters the connecting pipe, air circulation between the inside and the outside of the barrel body is achieved, the extraction and ventilation processes are met through the single valve body, and the cost is effectively reduced.

Description

Technical Field

[0001] This utility model relates to the field of nasal aspirators, specifically to a single-tube nasal aspirator. Background Technology

[0002] A nasal aspirator is a tool used to clean the nasal cavity, especially suitable for infants and young children, as well as people with excessive nasal secretions that are difficult to expel naturally. It uses pressure or negative pressure to suction out secretions, mucus, dust, and other dirt from the nasal cavity, thus keeping it clean and clear. Nasal aspirators include manual and electric types. Manual nasal aspirators are relatively simple and inexpensive, but require the user to control the suction force and frequency; electric nasal aspirators are more intelligent, allowing for more precise control of suction and flushing frequency, and are also more convenient to use.

[0003] When using a manual nasal aspirator, users typically need to pinch the bulb first, then gently insert the tip into the nasal cavity, and slowly release the bulb to use negative pressure to suction out the nasal mucus. This process requires gentle operation to avoid damaging the nasal cavity. For example, patent application CN201610525005.5, entitled "Nasal Aspirator," includes a pump, a connecting cylinder, and a suction tube. The pump is manually operated to retract and expand, and an opening is inserted into the pump. A check valve is installed on a portion of the connecting cylinder to prevent external inflow, and a check valve is installed at the base of the suction tube to prevent outflow from the pump to the suction tube. In other words, conventional nasal aspirators require an inlet and an outlet on the container, and check valves are installed at both the inlet and outlet to control the gas flow direction, which also leads to higher production costs. Utility Model Content

[0004] The purpose of this invention is to provide a single-tube nasal aspirator, which aims to improve upon the problem that conventional nasal aspirators require an air inlet and an air outlet on the container, and check valves on both the air inlet and the air outlet to control the direction of gas flow, which also leads to higher production costs.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A single-tube nasal aspirator includes an suction component, a connecting tube, and an air suction mechanism;

[0007] The two ends of the connecting tube are respectively connected to the suction component and the air extraction mechanism;

[0008] The air extraction mechanism includes a cylinder body, a piston, and an umbrella valve. The piston is disposed inside the cylinder body. At least one air exchange channel is provided at the lower end of the cylinder body. One end of the umbrella valve passes through the cylinder body and is provided with an outwardly extending flexible valve plate. The flexible valve plate covers the outside of the air exchange channel. The other end of the umbrella valve is provided with a protrusion, which abuts against the inner side of the cylinder body.

[0009] Furthermore, the bottom of the cylinder body is provided with an inwardly recessed portion, the ventilation channel is opened on the recessed portion, and the recessed portion is provided with an installation channel.

[0010] The umbrella valve includes a mounting post with its bottom end passing through a mounting channel, a flexible valve plate disposed at the bottom of the mounting post, and a protrusion disposed at the top of the mounting post.

[0011] Furthermore, the side of the protrusion is an inclined curved surface, and the upper inner side of the inclined curved surface is inclined outward to the outer side. The mounting post includes a plug section and a guide section. The plug section is located above the protrusion, and the guide section is located between the protrusion and the flexible valve plate. The diameter of the plug section is smaller than the diameter of the guide section, and the diameter of the guide section is less than or equal to the diameter of the mounting channel.

[0012] Furthermore, a convex ring is provided in the recessed portion, and the flexible valve plate includes a valve plate body. An inclined portion is provided on the edge of the valve plate body. The inclined portion slopes downward from the inside to the outside. The thickness of the inclined portion is less than the thickness of the valve plate body. The inclined portion corresponds to the position of the convex ring and extends to the outside of the convex ring.

[0013] Furthermore, the piston includes a piston head, a connecting rod, and a piston sealing ring. The piston sealing ring is sleeved on the side of the piston head, the bottom end of the connecting rod is connected to the piston head, and the top end of the connecting rod passes through the cylinder body and extends outward.

[0014] Furthermore, the piston head includes an upper pressure plate and a lower pressure plate, and the piston sealing ring includes an embedded portion and an inclined sealing portion.

[0015] The bottom end of the connecting rod passes through the upper pressure plate and connects to the lower pressure plate; an embedding space is provided between the ends of the upper pressure plate and the lower pressure plate, and the embedding part is disposed in the embedding space, with the top and bottom surfaces of the embedding part respectively fitting against the bottom surface of the upper pressure plate and the top surface of the lower pressure plate; the bottom inner side of the inclined sealing part is connected to the outer side of the embedding part, the top inner side of the inclined sealing part is spaced apart from the end of the upper pressure plate, and the bottom outer side of the inclined sealing part is spaced apart from the inner wall of the cylinder body.

[0016] Furthermore, an air inlet pipe is provided on the outer side of the cylinder body, the air inlet pipe is connected to the interior of the cylinder body, and one end of the connecting pipe is inserted into the air inlet pipe.

[0017] Furthermore, the suction assembly includes an upper shell and a lower shell connected to each other; the upper shell and the lower shell enclose a receiving space, the top of the upper shell has a second suction channel and a suction head, the suction head has a first suction channel, and the first suction channel and the second suction channel are interconnected.

[0018] A ventilation pipe is provided inside the lower shell. The top end of the ventilation pipe extends upward and is connected to the accommodating space. The bottom end of the ventilation pipe extends downward through the lower shell. The other end of the connecting pipe is inserted into the bottom end of the ventilation pipe.

[0019] Furthermore, an extension tube is inserted into the top of the ventilation pipe, and a horizontally protruding baffle plate is provided at the top of the extension tube; an air inlet is provided on the upper side of the extension tube, and an air extraction channel is provided inside the extension tube. The top of the air extraction channel is connected to the air inlet, and the bottom of the air extraction channel is connected to the ventilation pipe.

[0020] Furthermore, the cylinder body includes an upper cylinder and a lower cylinder, the upper cylinder being fixed on the lower cylinder and forming a driving cavity, and the piston being disposed within the driving cavity.

[0021] A handle is fixed to the top surface of the upper cylinder.

[0022] By adopting the above technical solution, this utility model has the following advantages compared with the prior art:

[0023] The connecting pipe connects the suction component and the air extraction mechanism. When the piston moves upward, it extracts air. Under the action of external air pressure, the flexible valve plate adheres to the air exchange channel, sealing the air exchange channel and ensuring that gas can stably enter the air extraction mechanism from the suction component and the connecting pipe, thus ensuring good suction effect. When the piston moves downward, it exchanges air. The internal air pressure pushes the flexible valve plate to separate from the air exchange channel, so that most of the gas flows out of the cylinder body through the air exchange channel, and a small part of the gas enters the connecting pipe, realizing air circulation between the inside and outside of the cylinder body. A single valve body can meet the extraction and air exchange processes, effectively reducing costs. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the single-tube nasal aspirator described in this utility model;

[0025] Figure 2 This is a cross-sectional structural diagram of the single-tube nasal aspirator described in this utility model;

[0026] Figure 3 This is an enlarged schematic diagram of part A of the single-tube nasal aspirator described in this utility model;

[0027] Figure 4This is a schematic diagram of the internal structure of the lower cylinder of the single-cylinder nasal aspirator described in this utility model;

[0028] Figure 5 This is a schematic diagram of the bottom structure of the lower cylinder of the single-cylinder nasal aspirator described in this utility model;

[0029] Figure 6 This is a schematic diagram of the piston structure of the single-tube nasal aspirator described in this utility model;

[0030] Figure 7 This is a schematic diagram of the piston explosion structure of the single-tube nasal aspirator described in this utility model;

[0031] Figure 8 This is a schematic diagram of the umbrella-shaped valve structure of the single-tube nasal aspirator of this utility model;

[0032] Figure 9 This is a schematic diagram of the gas flow direction during the suction process of the single-tube nasal aspirator described in this utility model;

[0033] Figure 10 This is a schematic diagram of the gas flow direction during the ventilation process of the single-tube nasal aspirator described in this utility model.

[0034] Explanation of reference numerals in the attached figures:

[0035] 1. Suction assembly; 11. Upper shell; 111. Suction head; 1111. First suction channel; 112. Second suction channel; 12. Lower shell; 121. Ventilation pipe; 122. Extension pipe; 1221. Baffle plate; 1222. Air inlet; 1223. Suction channel; 13. Accommodation space;

[0036] 2. Connecting pipe;

[0037] 3. Air extraction mechanism; 31. Cylinder body; 311. Upper cylinder; 3111. Handle; 312. Lower cylinder; 3121. Air inlet pipe; 3122. Recess; 3123. Mounting channel; 3124. Air exchange channel; 3125. Protruding ring; 313. Drive chamber; 32. Piston; 321. Piston head; 3211. Upper pressure plate; 3212. Insertion channel; 3213. Lower pressure plate; 3214. Insertion groove; 3 215. Embedding space; 322. Piston seal ring; 3221. Embedding part; 3222. Inclined sealing part; 323. Connecting rod; 3231. Drive ring; 3232. Insert rod; 324. Elastic reset element; 33. Umbrella valve; 331. Mounting post; 3311. Insertion section; 3312. Guide section; 332. Protrusion; 333. Flexible valve plate; 3331. Valve plate body; 3332. Inclined part. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0039] Additionally, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" are all based on the orientation or positional relationship shown in the accompanying drawings. They are merely for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element of this utility model must have a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0040] When an element is referred to as being "fixed to," "set on," or "contained on" another element, it can be directly on or indirectly on that other element. When an element is referred to as being "connected to," it can be directly connected to or indirectly connected to that other element.

[0041] Unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0042] Example

[0043] Please refer to Figure 1-10 As shown, this embodiment provides a single-tube nasal aspirator, including an suction component 1, a connecting tube 2, and an air extraction mechanism 3. The two ends of the connecting tube 2 are respectively connected to the suction component 1 and the air extraction mechanism 3. The air extraction mechanism 3 includes a tube body 31, a piston 32, and an umbrella-shaped valve 33. The piston 32 is disposed inside the tube body 31, and at least one ventilation channel 3124 is provided at the lower end of the tube body 31. One end of the umbrella-shaped valve 33 passes through the tube body 31 and is provided with an outwardly extending flexible valve plate 333; the flexible valve plate 333 covers the outside of the ventilation channel 3124. The other end of the umbrella-shaped valve 33 is provided with a protrusion 332, which abuts against the inner surface of the tube body 31.

[0044] Please refer to Figure 9 and Figure 10As shown, the connecting pipe 2 connects the suction assembly 1 and the air extraction mechanism 3. The piston 32 moves upward to extract air, and the flexible valve plate 333, under external air pressure, adheres to the ventilation channel 3124, sealing the ventilation channel 3124. This ensures that gas can stably enter the air extraction mechanism 3 from the suction assembly 1 and the connecting pipe 2, ensuring good suction performance. When the piston 32 moves downward to exchange air, the internal air pressure pushes the flexible valve plate 333 away from the ventilation channel 3124, allowing most of the gas to flow out of the cylinder body 31 through the ventilation channel 3124, while a small portion enters the connecting pipe 2. This achieves air circulation between the inside and outside of the cylinder body 31, enabling a single valve body to handle both extraction and air exchange processes, effectively reducing costs. Simultaneously, the protrusion 332 abuts against the interior of the cylinder body 31, limiting the position of the umbrella valve 33 and preventing it from detaching and affecting its use.

[0045] Please refer to Figure 2-5As shown, the bottom of the cylinder body 31 has an inwardly recessed portion 3122, and an air exchange channel 3124 is formed in the recessed portion 3122. An installation channel 3123 is formed in the recessed portion 3122. In this embodiment, there are four air exchange channels 3124, which surround the installation channel 3123. The larger and more numerous air exchange channels 3124 improve the air exchange efficiency between the cylinder body 31 and the outside, and reduce the airflow entering the connecting pipe 2. The umbrella valve 33 includes a mounting post 331, the bottom end of which passes through the installation channel 3123. A flexible valve plate 333 is disposed at the bottom of the mounting post 331, and a protrusion 332 is disposed at the upper part of the mounting post 331. In this embodiment, the mounting post 331 is a flexible mounting post 331, which facilitates the installation of the umbrella valve 33. Specifically, the mounting post 331 includes a plug-in section 3311 and a guide section 3312. The plug-in section 3311 is located above the protrusion 332, and the guide section 3312 is located between the protrusion 332 and the flexible valve plate 333. The diameter of the plug-in section 3311 is smaller than the diameter of the guide section 3312; the diameter of the guide section 3312 is less than or equal to the diameter of the mounting channel 3123. In this embodiment, the diameter of the guide section 3312 is smaller than the diameter of the mounting channel 3123. Similarly, the diameter of the guide end can also be equal to the diameter of the mounting channel 3123. The side of the protrusion 332 is an inclined curved surface, with the inner side of the upper end of the inclined curved surface sloping outward to the outer side. The protrusion 332 and the upper plug-in section 3311 form a plug-in structure that is smaller at the top and larger at the bottom. Utilizing its own flexibility, it is easy to drive the protrusion 332 from bottom to top through the mounting channel 3123 to realize the installation of the umbrella valve 33. The guide section 3312 has a smaller diameter than the installation channel 3123, giving it greater flexibility. During the evacuation process, the external atmospheric pressure acts on the outer side of the flexible valve plate 333, pushing the umbrella valve 33 upward and reducing the distance between the flexible valve plate 333 and the recessed portion 3122, ensuring a tight fit between them. Simultaneously, the inwardly recessed portion 3122 increases the contact area between the flexible valve plate 333 and the recessed portion 3122, further enhancing the sealing effect of the umbrella valve 33.

[0046] Please refer to Figure 3As shown, specifically, a protruding ring 3125 is provided within the recessed portion 3122. The flexible valve plate 333 includes a valve plate body 3331, and an inclined portion 3332 is provided on the edge of the valve plate body 3331. The inclined portion 3332 corresponds to the position of the protruding ring 3125 and extends to the outer side of the protruding ring 3125. The inclined portion 3332 slopes downward from the inner side to the outer side, and the thickness of the inclined portion 3332 is less than the thickness of the valve plate body 3331. The inclined portion 3332 is located on the outer side of the protruding ring 3125. During the air extraction process, the flexible valve plate 333 and the recessed portion 3122 fit together. The thinner inclined portion 3332 can fit onto the protruding ring 3125 from multiple directions, further improving the sealing effect of the umbrella valve 33.

[0047] Please refer to Figure 6 and Figure 7 As shown, specifically, the piston 32 includes a piston head 321, a connecting rod 323, and a piston 32 sealing ring. The piston 32 sealing ring is sleeved on the side of the piston head 321. The bottom end of the connecting rod 323 is connected to the piston head 321, and the top end of the connecting rod 323 passes through the cylinder body 31 and extends outward. Furthermore, a drive ring 3231 is connected to the top end of the connecting rod 323. The drive ring 3231 allows a finger to pass through, driving the piston head 321 to move upward to pump air or downward to reset.

[0048] The piston head 321 includes an upper pressure plate 3211 and a lower pressure plate 3213. The piston 32 sealing ring includes an embedded portion 3221 and an inclined sealing portion 3222. The bottom end of the connecting rod 323 passes through the upper pressure plate 3211 and connects to the lower pressure plate 3213. In this embodiment, the upper pressure plate 3211 has an insertion channel 3212 in the middle, and the lower pressure plate 3213 has an insertion groove 3214 in the middle, with an internal thread inside the insertion groove 3214. The bottom end of the connecting rod 323 is provided with an outwardly protruding insertion rod 3232. The diameter of the insertion rod 3232 is smaller than the diameter of the connecting rod 323. The outer surface of the insertion rod 3232 is provided with an external thread. The insertion rod 3232 passes through the insertion channel 3212 and is threadedly connected to the insertion groove 3214. The bottom end of the connecting rod 323 abuts against the upper pressure plate 3211, ensuring the stability of the installation of the upper pressure plate 3211 and the lower pressure plate 3213. The connecting rod 323 and the piston head 321 are detachably connected by internal and external threads, which facilitates the installation, disassembly and maintenance of the piston 32.

[0049] Please refer to Figure 2 and Figure 3As shown, an embedding space 3215 is provided between the ends of the upper pressure plate 3211 and the lower pressure plate 3213. The embedding part 3221 is disposed in the embedding space 3215, and the top and bottom surfaces of the embedding part 3221 are respectively in contact with the bottom surface of the upper pressure plate 3211 and the top surface of the lower pressure plate 3213. The upper pressure plate 3211 and the lower pressure plate 3213 press and limit the piston sealing ring 322 from the upper and lower sides to prevent the piston sealing ring 322 from deforming under force and detaching from the embedding space 3215, thus affecting the continuity of piston 32 operation. The bottom inner side of the inclined sealing part 3222 is connected to the outer side of the embedding part 3221, and the top inner side of the inclined sealing part 3222 is spaced apart from the end of the upper pressure plate 3211. In this embodiment, the bottom of the inclined sealing part 3222 is inclined from the inside out to the top. When piston 32 moves upward to draw air, the top of the inclined sealing part 3222 is tightly fitted with the inner side of the cylinder body 31. During the downward exhaust process of piston 32, the upper pressure plate 3211 provides movement space for the top of the inclined sealing part 3222, allowing the air below piston 32 to push the top of the inclined sealing part 3222 towards the upper pressure plate 3211. A connecting channel is formed above and below piston 32, allowing air below to enter and exit above, further increasing the exhaust direction and reducing the airflow entering the connecting pipe 2. The bottom outer side of the inclined sealing part 3222 is spaced apart from the inner sidewall of the cylinder body 31, making way for the gas below piston 32, allowing the gas below piston 32 to better push the top of the inclined sealing part 3222 after entering.

[0050] Furthermore, the piston 32 also includes an elastic reset member 324, which surrounds the connecting rod 323. The two ends of the elastic reset member 324 abut against the top surface of the upper pressure plate 3211 and the inner top surface of the cylinder body 31, respectively. During the evacuation process, the piston 32 moves upward, compressing the elastic reset member 324. Upon completion of evacuation, the elastic reset member 324 provides a downward reset force to the piston 32, driving the piston 32 to move downward and reset, thus discharging the gas below the piston 32. In this embodiment, the elastic reset member 324 is a spring; similarly, it can also be other compressible and rebound-capable structures.

[0051] An air inlet pipe 3121 is provided on the outer surface of the cylinder body 31, and the air inlet pipe 3121 is connected to the interior of the cylinder body 31. One end of the connecting pipe 2 is inserted into the air inlet pipe 3121. The air inlet pipe 3121 is located on the side of the outer cylinder, making the bottom surface of the outer cylinder flat, which facilitates the placement of the outer cylinder and improves the convenience of use. Furthermore, the diameter of the inner opening of the air inlet pipe 3121 is smaller than the diameter of the outer opening of the air inlet pipe 3121, forming a trumpet-shaped pipe that is larger on the outside and smaller on the inside. This increases the air velocity in the connecting pipe 2 during the air extraction process, while further reducing the airflow rate entering the connecting pipe 2 during the ventilation process.

[0052] The main body 31 includes an upper cylinder 311 and a lower cylinder 312. The upper cylinder 311 is fixed to the lower cylinder 312 and together form a driving cavity 313. The piston 32 is disposed within the driving cavity 313. In this embodiment, the upper cylinder 311 and the lower cylinder 312 are connected by threads, or they can be detachably connected by a sliding groove structure or the like. In this embodiment, the air inlet pipe 3121 is disposed on the side of the lower cylinder 312, and the recess 3122 is disposed on the bottom surface of the lower cylinder 312. A handle 3111 is fixed on the top surface of the upper cylinder 311, which is used by the user to grip and facilitate the handling, movement, or placement of the nasal aspirator.

[0053] Please refer to Figure 1 and Figure 2 As shown, the suction assembly 1 includes an upper shell 11 and a lower shell 12 connected to each other; the upper shell 11 and the lower shell 12 enclose a receiving space 13. The top of the upper shell 11 is provided with a second suction channel 112 and a suction head 111; the suction head 111 is provided with a first suction channel 1111, and the first suction channel 1111 and the second suction channel 112 are interconnected.

[0054] A ventilation pipe 121 is provided inside the lower shell 12. The top end of the ventilation pipe 121 extends upward and connects to the receiving space 13. The bottom end of the ventilation pipe 121 extends downward through the lower shell 12, and the other end of the connecting pipe 2 is inserted into the bottom end of the ventilation pipe 121. Foreign objects in the child's nasal cavity pass through the first suction channel 1111 and the second suction channel 112 into the receiving space 13 for collection. In this embodiment, the suction head 111 is a flexible suction head 111 to avoid damage to the child's nasal cavity. Similarly, the suction head 111 can be a curved suction head 111 to ensure that the suction assembly 1 is upright during use, preventing foreign objects from entering the connecting pipe 2.

[0055] A ventilation pipe 121 is provided inside the lower shell 12. The top end of the ventilation pipe 121 extends upward and connects to the receiving space 13. Raising the height of the upper opening of the ventilation pipe 121 increases the capacity of the receiving space 13 and prevents foreign objects from directly entering the connecting pipe 2. The bottom end of the ventilation pipe 121 extends downward through the lower shell 12, and the other end of the connecting pipe 2 is inserted into the bottom end of the ventilation pipe 121. In this embodiment, an extension pipe 122 is inserted into the top end of the ventilation pipe 121, which further increases the height of the ventilation pipe 121 and increases the capacity of the receiving space 13. The extension tube 122 has a horizontally protruding baffle plate 1221 at its top; an air inlet 1222 is provided on the upper side of the extension tube 122, and an air extraction channel 1223 is provided inside the extension tube 122. The top end of the air extraction channel 1223 is connected to the air inlet 1222, and the bottom end of the air extraction channel 1223 is connected to the ventilation pipe 121. The air inlet 1222 is located below the baffle plate 1221. The baffle plate 1221 blocks falling foreign objects, preventing them from falling directly into the air inlet 1222. Furthermore, the air inlet 1222 is located on the side of the extension tube 122, further reducing the possibility of foreign objects falling directly into the air inlet 1222. Similarly, the extension tube 122 can be integrally formed with the top of the air inlet pipe 3121, reducing the number of parts and thus reducing assembly time.

[0056] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A single-tube nasal aspirator, characterized in that, Includes suction components, connecting pipes, and a vacuum mechanism; The two ends of the connecting tube are respectively connected to the suction component and the air extraction mechanism; The air extraction mechanism includes a cylinder body, a piston, and an umbrella valve. The piston is disposed inside the cylinder body. At least one air exchange channel is provided at the lower end of the cylinder body. One end of the umbrella valve passes through the cylinder body and is provided with an outwardly extending flexible valve plate. The flexible valve plate covers the outside of the air exchange channel. The other end of the umbrella valve is provided with a protrusion, which abuts against the inner side of the cylinder body.

2. The single-tube nasal aspirator according to claim 1, characterized in that: The bottom of the cylinder body is provided with an inwardly recessed portion, the ventilation channel is opened on the recessed portion, and the recessed portion is provided with an installation channel. The umbrella valve includes a mounting post with its bottom end passing through a mounting channel, a flexible valve plate disposed at the bottom of the mounting post, and a protrusion disposed at the top of the mounting post.

3. The single-tube nasal aspirator according to claim 2, characterized in that: The side of the protrusion is an inclined curved surface, and the upper inner side of the inclined curved surface is inclined outward to the outer side. The mounting post includes a plug section and a guide section. The plug section is located above the protrusion, and the guide section is located between the protrusion and the flexible valve plate. The diameter of the plug section is smaller than the diameter of the guide section, and the diameter of the guide section is less than or equal to the diameter of the mounting channel.

4. The single-tube nasal aspirator according to claim 2, characterized in that: A convex ring is provided in the recessed portion. The flexible valve plate includes a valve plate body. An inclined portion is provided on the edge of the valve plate body. The inclined portion slopes downward from the inside to the outside. The thickness of the inclined portion is less than the thickness of the valve plate body. The inclined portion corresponds to the position of the convex ring and extends to the outside of the convex ring.

5. The single-tube nasal aspirator according to claim 1, characterized in that: The piston includes a piston head, a connecting rod, and a piston sealing ring. The piston sealing ring is sleeved on the side of the piston head. The bottom end of the connecting rod is connected to the piston head, and the top end of the connecting rod passes through the cylinder body and extends outward.

6. The single-tube nasal aspirator according to claim 5, characterized in that: The piston head includes an upper pressure plate and a lower pressure plate, and the piston sealing ring includes an embedded portion and an inclined sealing portion. The bottom end of the connecting rod passes through the upper pressure plate and connects to the lower pressure plate; an embedding space is provided between the ends of the upper pressure plate and the lower pressure plate, and the embedding part is disposed in the embedding space, with the top and bottom surfaces of the embedding part respectively fitting against the bottom surface of the upper pressure plate and the top surface of the lower pressure plate; the bottom inner side of the inclined sealing part is connected to the outer side of the embedding part, the top inner side of the inclined sealing part is spaced apart from the end of the upper pressure plate, and the bottom outer side of the inclined sealing part is spaced apart from the inner wall of the cylinder body.

7. The single-tube nasal aspirator according to claim 1, characterized in that: An air inlet pipe is provided on the outer side of the cylinder body, and the air inlet pipe is connected to the interior of the cylinder body. One end of the connecting pipe is inserted into the air inlet pipe.

8. The single-tube nasal aspirator according to claim 1, characterized in that: The suction assembly includes an upper shell and a lower shell connected to each other; the upper shell and the lower shell enclose a receiving space, the top of the upper shell has a second suction channel and a suction head, the suction head has a first suction channel, and the first suction channel and the second suction channel are interconnected. A ventilation pipe is provided inside the lower shell. The top end of the ventilation pipe extends upward and is connected to the accommodating space. The bottom end of the ventilation pipe extends downward through the lower shell. The other end of the connecting pipe is inserted into the bottom end of the ventilation pipe.

9. The single-tube nasal aspirator according to claim 8, characterized in that: An extension tube is inserted into the top of the ventilation pipe, and a horizontally protruding baffle plate is provided at the top of the extension tube; an air inlet is provided on the upper side of the extension tube, and an air extraction channel is provided inside the extension tube. The top of the air extraction channel is connected to the air inlet, and the bottom of the air extraction channel is connected to the ventilation pipe.

10. The single-tube nasal aspirator according to claim 1, characterized in that: The cylinder body includes an upper cylinder and a lower cylinder, the upper cylinder is fixed on the lower cylinder and together form a driving cavity, and the piston is disposed within the driving cavity. A handle is fixed to the top surface of the upper cylinder.

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