Air extractor and nasal aspirator

Abstract

The embodiment of the utility model discloses an air extractor and a nasal aspirator, the air extractor comprises a cylinder body, the cylinder body is provided with a containing cavity and a first air hole, and the first air hole is communicated with the containing cavity; the volume-variable body is arranged in the containing cavity, and the volume-variable body is arranged in the containing cavity; and the volume-variable body is configured to reduce the air pressure in the accommodating cavity through the change of the volume of the volume-variable body in the accommodating cavity from large to small, and provide suction force to the outside through the first air hole. In the process that the air extractor provides suction force, the outer wall of the variable volume body does not make contact with the inner wall of the cylinder body, so that friction between the variable volume body and the cylinder body is avoided, and the service life of the device is prolonged. In addition, the air extractor can be provided with two one-way valves, and the airflow direction of the air extractor is controlled through the cooperation of the two one-way valves.

Description

Technical Field

[0001] The embodiments of the present application relate to an air extraction device and a nasal aspirator. Background Art

[0002] A nasal aspirator is a device used to suck out mucus. Nasal aspirators are primarily divided into two categories: electric and manual. The advantages of manual aspirators lie in their relatively simple structure and low cost. Existing manual aspirators suffer from wear and tear in their suction mechanism, which reduces airtightness and suction power over time. Furthermore, they often feature disposable connections, making them difficult to clean and maintain. Utility Model Content

[0003] An embodiment of the present application provides an air extraction device for solving at least one technical problem in the prior art.

[0004] A first aspect of an embodiment of the present application provides an air extraction device, comprising:

[0005] A cylinder body, the cylinder body is provided with a cavity and a first air hole, and the first air hole is connected to the cavity; and a variable volume body, the variable volume body is installed in the cavity; the variable volume body is configured to reduce the air pressure in the cavity by changing the volume of the variable volume body in the cavity from large to small, and provide suction force to the outside through the first air hole.

[0006] In some embodiments, the cylinder body is provided with an opening; the variable volume body includes a tube body, the tube body includes a first end and a second end, and the second end of the tube body is provided with a bottom wall; wherein, the first end of the tube body can selectively close the opening of the cylinder body, and the side wall of the tube body can selectively expand or contract in the cavity.

[0007] In some embodiments, the first end of the tube body is provided with an annular outer edge extending radially outward, the outer diameter of the outer edge is larger than the inner diameter of the opening of the cylinder body, and the first end of the tube body can selectively close the opening of the cylinder body through the outer edge.

[0008] In some embodiments, the sidewall of the tube body can be stretched or folded along the axial direction of the tube body.

[0009] In some embodiments, the vacuum device also includes a pull rod assembly, which includes a rod body, the first end of the rod body is inserted from the first end of the tube body and connected to the bottom wall of the tube body; the rod body is configured to drive the tube body to extend or contract by pushing and pulling the rod body.

[0010] In some embodiments, a cover is installed on the opening of the cylinder body, and the cover limits the outer edge at the opening of the cylinder body.

[0011] In some embodiments, the vacuum device also includes a second air hole and a first one-way valve; the second air hole is arranged on the tube body or the cylinder body; the first end of the second air hole is connected to the volume cavity of the cylinder body, and the second end of the second air hole is connected to the first one-way valve, and the gas in the volume cavity is discharged in one direction through the first one-way valve.

[0012] In some embodiments, the bottom wall of the tube body is provided with a through hole, a connecting piece is installed in the through hole, and the second air hole is provided on the connecting piece;

[0013] The rod body is provided with an air channel, and a side wall of the rod body is provided with a third air hole. The first end of the air channel is connected to the second air hole, and the second end of the air channel is connected to the third air hole.

[0014] In some embodiments, a locking block is provided on the outer wall of the first end of the rod body; a connecting column is provided on the connecting member, and the connecting column is provided with a plug hole, the plug hole is connected to the second air hole, a side wall of the plug hole is provided with a guide groove along the axial direction of the plug hole, a side wall of the connecting column on a side close to the connecting member is provided with a locking hole, and the locking hole is opened along the circumference of the connecting column, and the guide groove is connected to the locking hole;

[0015] The rod body can be selectively inserted into the insertion hole, and the locking block can be moved along the guide groove to a set position, and the rod body can be relatively rotated to make the locking block move toward the end of the locking hole.

[0016] In some embodiments, the air pumping device is provided with an elastic member, and the elastic member is configured to drive the variable capacity body to expand or contract through the restoring force of the elastic member.

[0017] In some embodiments, the first air hole is connected to a second one-way valve, and the volume cavity of the cylinder body can unidirectionally inhale air through the second one-way valve.

[0018] A second aspect of an embodiment of the present application provides a nasal aspirator, which includes the above-mentioned air extraction device, a liquid storage tank and an air guide tube; the liquid storage tank includes a chamber and a liquid inlet hole arranged at a first end of the liquid storage tank, the liquid inlet hole is connected to the chamber, the side wall of the liquid storage tank is provided with a fourth air hole, and the fourth air hole is connected to the chamber; the first end of the air guide tube is connected to the first air hole of the air extraction device, and the second end of the air guide tube is connected to the fourth air hole of the liquid storage tank.

[0019] In some embodiments, the liquid storage tank further includes a conduit, which is disposed in the chamber, and a first end of the conduit is connected to the liquid inlet.

[0020] Compared with the prior art, the embodiments of the present application have the following advantages: the present application includes a cylinder body and a variable volume body, the cylinder body is provided with a cavity and a first air hole, and the first air hole is connected to the cavity; the variable volume body is placed in the cavity, and the volume of the variable volume body can be selectively changed in the cavity; the air pressure in the cavity is changed by the change in the volume of the variable volume body, and the cavity provides a suction force to the outside through the first air hole by the change in the volume of the variable volume body from large to small. In the process of providing the suction force, the outer wall of the variable volume body may not contact the inner wall of the cylinder body, thereby avoiding friction between the two and improving the service life of the device. In addition, in some embodiments, an elastic member may be provided to assist the vacuum operation, and the user only needs to provide pulling force or pushing force, making the operation simpler and more convenient. Third, in some embodiments, the first air hole is connected to a second one-way valve, which only allows one-way air to enter the cavity; the second air hole is connected to the first one-way valve, which only allows one-way air to exit the cavity. The two one-way valves work together to control the direction of airflow in the suction device, ensuring that the suction device only provides suction to the liquid reservoir, making it easier to use the nasal aspirator. Fourth, the rod and connector in some embodiments are detachably connected, which improves the assembly efficiency of the suction device. Fifth, the liquid reservoir can be constructed in either a split or integrated configuration. Split configurations are relatively easy to clean and provide more comprehensive cleaning, facilitating reuse. However, integrated configurations can be used for single-use applications to prevent cross-infection. Alternatively, if the liquid reservoir is not cleaned thoroughly enough, some viruses may remain in the reservoir, leading to recurring infections. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings and descriptions that constitute part of this application are intended to provide a further understanding of this application. The exemplary embodiments and descriptions of this application are intended to explain this application and do not constitute an improper limitation on this application. Among them:

[0022] Figure 1 This is a schematic diagram of the overall structure of the nasal aspirator in an embodiment of the present application;

[0023] Figure 2 Schematic diagram of the structure of the air extraction device in the embodiment of the present application;

[0024] Figure 3 for Figure 2 Exploded diagram;

[0025] Figure 4 for Figure 1 A cross-sectional view of the air extraction device in the AA direction and a state of the air extraction device;

[0026] Figure 5 for Figure 1 A cross-sectional view of the air extraction device in the AA direction and a state 2 of the air extraction device;

[0027] Figure 6 for Figure 1 Structural diagram of the variable capacitance structure in FIG;

[0028] Figure 7 This is a schematic broken view of the structure of the volume-variable body in the embodiment of the present application;

[0029] Figure 8 for Figure 4 A cross-sectional view of the variable capacity body mounting spring;

[0030] Figure 9 for Figure 5 A cross-sectional view of the variable capacity body mounting spring;

[0031] Figure 10 for Figure 1 A cross-sectional view of the air extraction device in the longitudinal direction perpendicular to the AA direction;

[0032] Figure 11 This is a schematic structural diagram of the rod body in an embodiment of the present application;

[0033] Figure 12 This is a schematic structural diagram of a connecting member in an embodiment of the present application;

[0034] Figure 13 for Figure 12 Schematic diagram from another perspective;

[0035] Figure 14 for Figure 13 BB direction cross-sectional view;

[0036] Figure 15 This is an exploded view of an embodiment of a liquid storage tank in the embodiment of the present application;

[0037] Figure 16 for Figure 15 Broken view;

[0038] Figure 17 This is a schematic diagram of another embodiment of the liquid storage tank in the embodiment of the present application.

[0039] Explanation of reference numerals: 10 - air extraction device; 11 - variable volume structure; 110 - variable volume body; 12 - cylinder body; 1201 - cavity; 1202 - first air hole; 1203 - cylinder bottom; 13 - cover; 1301 - first through hole; 1302 - first handle; 14 - pull rod assembly; 1401 - rod body; 1402 - air passage; 1403 - third air hole; 1404 - second handle; 1405 - locking block; 15 - tube body; 1501 - inner cavity; 1502 - second through hole; 1503 - outer edge; 1504 - side wall; 1505 - bottom wall; 16 - connecting piece; 1601 - second air hole; 1602 - annular groove; 1603 - connecting column; 1604 - plug-in hole; 1605 - guide groove; 1606 - lock hole; 17 - spring; 1801 - first installation area; 1802 - second installation area; 1803 - third installation area; 1804 - fourth installation area; 20 - liquid storage tank; 21 - head; 22 - tank part; 2101 - liquid inlet hole; 2102 - conduit; 2103 - fourth air hole; 2104 - second one-way valve; 23 - chamber; 30 - air guide tube. DETAILED DESCRIPTION

[0040] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments. Each example is provided by way of explanation of the present application and does not limit the present application. In fact, it will be clear to those skilled in the art that modifications and variations can be made in the present application without departing from the scope or spirit of the present application. For example, a feature shown or described as part of one embodiment can be used in another embodiment to produce yet another embodiment. Therefore, it is expected that the present application includes such modifications and variations within the scope of the appended claims and their equivalents.

[0041] In the description of this application, the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and do not require that this application must be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on this application. The terms "connected", "connected", and "set" used in this application should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components; they can be wired electrical connections, radio connections, or wireless communication signal connections. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0042] One or more examples of the present application are shown in the accompanying drawings. The detailed description uses numbers and letters to refer to features in the drawings. Like or similar numbers in the drawings and the description have been used to refer to like or similar parts of the present application. As used herein, the terms "first," "second," and "third," etc. are used interchangeably to distinguish one component from another and are not intended to indicate the position or importance of individual components.

[0043] like Figure 1 As shown, according to an embodiment of the present application, a nasal aspirator is provided, which includes an air suction device 10, a liquid storage tank 20 and an air guide tube 30, and the two ends of the air guide tube 30 are respectively connected to the air suction device 10 and the liquid storage tank 20.

[0044] The present embodiment discloses a vacuum device 10, which includes a variable volume structure 11 and a cylinder 12. The cylinder 12 is provided with a cavity 1201 with an opening at one end, with the opening being located at the first end of the cylinder 12. A cylinder bottom 1203 is provided at the second end of the cylinder 12, with a first air hole 1202 disposed at the bottom 1203. The first air hole 1202 communicates with the cavity 1201. The variable volume structure 11 includes a variable volume body 110, which is disposed within the cavity 1201 of the cylinder 12. The volume of the variable volume body 110 can be selectively increased or decreased within the cavity 1201. The first end of the variable-volume body 110 away from the cylinder bottom 1203 closes the opening of the cylinder body 12. When the volume of the variable-volume body 110 in the cavity 1201 increases, the air pressure in the cavity 1201 increases, and the air in the cavity 1201 is pressed out from the first air hole 1202; when the volume of the variable-volume body 110 in the cavity 1201 decreases, the air pressure in the cavity 1201 decreases, and the air outside the cylinder body 12 is sucked into the cavity 1201 from the first air hole 1202.

[0045] In some embodiments, the volume-variable body 110 includes a retractable tubular body 15 having an inner cavity 1501 with an opening at a first end. The first end of the tubular body 15 can seal the opening of the cylinder 12. The second end of the tubular body 15 has a bottom wall 1505. The sidewalls 1504 of the tubular body 15 can expand or contract along the axial direction of the tubular body 15, allowing the second end of the tubular body 15 to move closer to or further from the bottom of the cylinder 12, thereby achieving the purpose of changing the volume of the tubular body 15 within the cylinder 12.

[0046] like Figure 2 、 Figure 3 and Figure 7As shown, in some embodiments, the first end of the tube body 15 is provided with an annular outer edge 1503 extending radially outward. The outer diameter of the outer edge 1503 is larger than the inner diameter of the opening of the cylinder body 12. Therefore, after the second end of the tube body 15 is inserted into the cylinder body 12, the outer edge 1503 of the tube body 15 and the opening of the cylinder body 12 abut against each other and are tightly connected, so that the opening of the cylinder body 12 is closed by the first end of the rod body 1401. The side wall 1504 of the tube body 15 can be folded or stretched along the axial direction of the tube body 15 to achieve the purpose of changing the volume of the tube body 15 within the cylinder body 12.

[0047] In some embodiments, as Figure 3 and Figure 4 As shown, the variable capacitance structure 11 further includes a rod assembly 14, which includes a rod body 1401. The first end of the rod body 1401 is inserted from the first end of the tube body 15 and connected to the second end of the tube body 15. The rod body 1401 can selectively reciprocate along the axial direction of the tube body 15, and the second end of the tube body 15 moves along with the rod body 1401, so that the side wall 1504 of the tube body 15 folds or expands.

[0048] In some embodiments, as Figure 4 As shown, a cap 13 is mounted on the first end of the cylinder body 12. The inner diameter of the cap 13 is larger than the outer diameter of the outer edge 1503 of the tube body 15. When the cap 13 is fastened to the first end of the cylinder body 12, the outer edge 1503 of the tube body 15 and the opening of the cylinder body 12 are further compressed, improving the airtightness between the two. A first through-hole 1301 is provided at the top of the cap 13 for the rod 1401 to pass through.

[0049] In some embodiments, as Figure 4 As shown, the inner wall of the cover 13 is provided with internal threads, and the first end of the cylinder body 12 is provided with external threads, and the cover 13 and the cylinder body 12 are connected by threaded engagement. In addition, the cover 13 and the first end of the cylinder body 12 can also be connected to each other by a snap-fit ​​method. Alternatively, the two can be directly bonded together.

[0050] In some embodiments, as Figure 4 As shown, the inner wall of the first through hole 1301 is loosely matched with the outer wall of the rod body 1401 , and the first through hole 1301 can limit the movement direction of the rod body 1401 .

[0051] In some embodiments, as Figure 7 As shown, the bottom wall 1505 of the tube body 15 is provided with a second through hole 1502, which is mated with the connector 16. Specifically, the connector 16 is a column, and the side wall 1504 of the connector 16 is provided with an inwardly recessed annular groove 1602. The second through hole 1502 of the tube body 15 and the annular groove 1602 of the connector 16 engage with each other, so that the connector 16 is fixedly mounted on the bottom wall 1505 of the tube body 15. The first end of the rod body 1401 is connected to the connector 16.

[0052] like Figure 1 As shown, for the liquid storage tank 20, it only needs the air extraction device 10 to provide it with sufficient suction. Therefore, the air extraction device 10 of the present application needs to inhale enough air through the first air hole 1202 so that the liquid storage tank 20 connected to the first air hole 1202 has sufficient suction and can smoothly suck the mucus into the liquid storage tank 20. However, it is not necessary to exhaust air from the first air hole 1202. To this end, in some embodiments, a second air hole 1601 can be provided on the bottom wall 1505 of the tube body 15, and the second air hole 1601 can connect the cavity 1201 of the cylinder body 12 with the inner cavity 1501 of the tube body 15. The second air hole 1601 is connected to a first one-way valve, and the air in the cavity 1201 can be discharged in one direction through the first one-way valve. In addition, in some embodiments, the second air hole 1601 can also be provided on the cylinder body 12, and the second air hole 1601 can connect the cavity 1201 of the cylinder body 12 with the outside of the cylinder body 12. The second air hole 1601 is connected to a first one-way valve, and the air in the cavity 1201 can be discharged in one direction through the first one-way valve.

[0053] like Figure 6 As shown, in some embodiments, the second air hole 1601 is provided on the connecting member 16. The first end of the rod body 1401 is provided with an air channel 1402, and the side wall 1504 of the rod body 1401 is provided with a third air hole 1403. The first end of the air channel 1402 is connected to the second air hole 1601, and the second end of the air channel 1402 is connected to the third air hole 1403. The first one-way valve 111 is installed on the third air hole 1403.

[0054] As tube 15 expands, the air pressure within cavity 1201 rises, causing some of the air in cavity 1201 to be expelled through second air hole 1601. However, some of the air in cavity 1201 will still be expelled through first air hole 1202. To this end, in some embodiments, first air hole 1202 is connected to second one-way valve 2104, allowing cavity 1201 to draw air in one direction through second one-way valve 2104. Under the control of first and second one-way valves 2104, air extraction device 10 provides suction only to liquid storage tank 20.

[0055] In some embodiments, for ease of use, such as Figure 2 and Figure 3 As shown, the top of the cover 13 is provided with a first handle 1302, which is a ring-shaped structure. The second end of the rod 1401 is provided with a second handle 1404, which can reciprocate within the ring structure of the first handle 1302. During use, one can hold the first and second handles 1302, 1404 in one hand, and when the grip is tight, pull the rod out to complete a pumping action.

[0056] like Figure 4 and Figure 5 As shown, in the above embodiment, the extension or contraction of the tube body 15 needs to be done manually. Figure 8 and Figure 9 As shown, in some embodiments, a spring 17 may be provided in the inner cavity 1501 of the tube 15, with the first end of the spring 17 abutting against the cover 13, and the second end of the spring 17 abutting against the bottom wall 1505 of the tube 15. Generally, the spring 17 has three states: 1. normal state without external force; 2. contraction under external force; 2. extension under external force. Assume that Figure 8 The spring 17 in is in normal state, as shown in FIG. Figure 9 As shown, the rod 1401 is pulled upward, so that the tube 15 contracts and the spring 17 is transformed into a contracted state. Figure 8 As shown, the spring 17 will actively return to a normal state, so that the tubular body 15 is transformed into an extended state. In this process, the user only needs to provide an upward pulling force, which makes the operation simpler and more convenient.

[0057] Second, in some embodiments, Figure 9 The spring 17 in is in normal state, as shown in FIG. Figure 8 As shown, push the rod 1401 downward, so that the tube 15 is extended and the spring 17 is transformed into an extended state. Figure 9 As shown, the spring 17 will actively restore to a normal state, so that the tube body 15 is transformed into a contracted state.

[0058] Additionally, in some embodiments, Figure 10 As shown, the air extraction device 10 may include, but is not limited to, the four mounting areas shown in the figure, including a first mounting area 1801 between the first handle 1302 and the second handle 1404, a second mounting area 1802 between the cover 13 and the second handle 1404, a third mounting area 1803 between the bottom wall 1505 of the tube body 15 and the cover 13, and a fourth mounting area 1804 between the bottom of the cylinder body 12 and the bottom wall 1505 of the tube body 15. The spring 17 in the above embodiment is mounted in the third mounting area 1803. In addition, the spring 17 may also be selectively mounted in other mounting areas, which can also achieve the function played by the spring 17 in the above embodiment.

[0059] In addition, the spring 17 in the above embodiment may also be replaced by other elastic members with restoring ability, such as an elastic leather strip.

[0060] In some embodiments, the tube body 15 has the ability to recover itself. The structure of the tube body 15 includes but is not limited to the following examples: Example 1, the side wall 1504 of the tube body 15 is Figure 4The folding structure shown is normally in an extended or folded state. The tube 15 can be transformed into the folded or extended state under the action of an external force, and can automatically return to the extended or folded state after the external force is removed. In Example 2, the sidewalls 1504 of the tube 15 are made of an elastic material. The tube 15 can be stretched under the action of an external force and automatically return to its normal state after the external force is removed.

[0061] like Figures 11 to 14 As shown, in some embodiments, a detachable connection structure is provided, comprising a locking block 1405 disposed on the sidewall 1504 of the first end of the rod body 1401. The connection structure also comprises a connecting post 1603 disposed on the connecting member 16. The connecting post 1603 is provided with a plug hole 1604, which communicates with the second air hole 1601. In this embodiment, the plug hole 1604 and the second air hole 1601 have the same axial direction. A guide groove 1605 is provided on the sidewall 1504 of the plug hole 1604. A locking hole 1606 is provided on the sidewall 1504 of the connecting post 1603 near the connecting member 16, and the locking hole 1606 extends along the circumference of the connecting post 1603. The end of the guide groove 1605 near the connecting member 16 communicates with the first end of the locking hole 1606. When connecting rod 1401 to connector 16, the first end of rod 1401 can be inserted into insertion hole 1604, and locking block 1405 on rod 1401 can be moved along guide slot 1605 to a set position. Rotating rod 1401 or connector 16 causes locking block 1405 to move toward the second end of locking hole 1606. This completes the connection between rod 1401 and connector 16, locking rod 1401 and connector 16 axially. Separating rod 1401 from connector 16 can be done by reversing the above process. If the end of guide slot 1605 near connector 16 is connected to the middle of locking hole 1606, after locking block 1405 on rod 1401 moves along guide slot 1605 to a set position, rod 1401 or connector 16 can be rotated in one of two directions to move locking block 1405 toward the first or second end of locking hole 1606.

[0062] The embodiment of the present application discloses a liquid storage tank 20, which is used to suck out nasal mucus. The first end of the liquid storage tank 20 is provided with a liquid inlet hole 2101, and the liquid storage tank 20 is provided with a chamber 23 for storing nasal mucus, and the liquid inlet hole 2101 is connected to the chamber 23. The outer wall of the liquid storage tank 20 is provided with a fourth air hole 2103, and the fourth air hole 2103 is connected to the cavity. The first end of the air guide tube 30 is connected to the first air hole 1202 of the suction device 10, and the second end is connected to the fourth air hole 2103 of the liquid storage tank 20. When in use, the first end of the liquid storage tank 20 is close to the nostril or inserted into the nostril. When the suction device 10 provides sufficient suction to the liquid storage tank 20, the nasal mucus in the nostril will be washed out and enter the chamber 23 along the liquid inlet hole 2101.

[0063] In some embodiments, as Figure 16 As shown, the second one-way valve 2104 in the above embodiment can be selectively provided in the fourth air hole 2103 .

[0064] In some embodiments, as Figure 16 As shown, a conduit 2102 is provided within the chamber 23 of the liquid storage tank 20. The first end of the conduit 2102 is connected to the liquid inlet 2101. The second end of the conduit 2102 is located closer to the bottom of the chamber 23 than the fourth air hole 2103. This allows mucus flowing from the liquid inlet 2101 to be guided into the chamber 23 through the conduit 2102, minimizing the risk of mucus entering the fourth air hole 2103 during its flow into the chamber 23 and potentially blocking the airway 30 or contaminating the airway 30 and the air extraction device 10.

[0065] In some embodiments, as Figure 15 and 16 As shown, the liquid storage tank 20a is a split structure, and the liquid storage tank 20a includes a head 21 and a tank portion 22, and the head 21 and the tank portion 22 are detachably connected. When cleaning the liquid storage tank 20a, the split structure is relatively easy, and the cleaning will be more comprehensive.

[0066] Additionally, in some embodiments, Figure 17 As shown, the liquid storage tank 20b can also be an integrated structure, which can be selectively used as a disposable to prevent cross infection; or the liquid storage tank 20b is not cleaned thoroughly, and some viruses still remain on the liquid storage tank 20, causing repeated infection. Of course, the integrated structure of the liquid storage tank 20b can also be reused.

[0067] The foregoing description is merely an example of the present invention and is not intended to limit the present invention. Persons skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A vacuum device (10), characterized in that: include: A cylinder body (12), wherein the cylinder body (12) is provided with a cavity (1201) and a first air hole (1202), and the first air hole (1202) is communicated with the cavity (1201); and a variable volume body (110), the variable volume body (110) being installed in the cavity (1201); The variable volume body (110) is configured to reduce the air pressure in the cavity (1201) by changing the volume of the variable volume body (110) from large to small in the cavity (1201), and provide suction force to the outside through the first air hole (1202).

2. The air extraction device (10) according to claim 1, characterized in that: The cylinder (12) is provided with an opening; The variable volume body (110) comprises a tube body (15), the tube body (15) comprises a first end and a second end, and the second end of the tube body (15) is provided with a bottom wall; The first end of the tube (15) can selectively close the opening of the cylinder (12), and the side wall (1504) of the tube (15) can selectively expand or contract in the cavity (1201).

3. The air extraction device (10) according to claim 2, characterized in that: The first end of the tube body (15) is provided with an annular outer edge (1503) extending radially outward, the outer diameter of the outer edge (1503) is larger than the inner diameter of the opening of the cylinder body (12), and the first end of the tube body (15) can selectively close the opening of the cylinder body (12) through the outer edge (1503); or / and The side wall (1504) of the tube body (15) can be stretched or folded along the axial direction of the tube body (15).

4. The air extraction device (10) according to claim 2 or 3, characterized in that: The air extraction device further comprises a pull rod assembly (14), wherein the pull rod assembly (14) comprises a rod body (1401), wherein a first end of the rod body (1401) is inserted from a first end of the tube body (15) and connected to a bottom wall of the tube body (15); The rod body (1401) is configured to drive the tube body (15) to extend or contract by pushing or pulling the rod body (1401).

5. The air extraction device (10) according to claim 3, characterized in that: The opening of the cylinder body (12) is provided with a cover (13), and the cover (13) limits the outer edge (1503) at the opening of the cylinder body (12).

6. The air extraction device (10) according to claim 4, characterized in that: The air extraction device (10) further includes a second air hole and a first one-way valve (111); The second air hole is provided on the tube body (15) or the cylinder body (12); a first end of the second air hole is communicated with the volume cavity (1201) of the cylinder body (12), and a second end of the second air hole is connected to the first one-way valve (111); the gas in the volume cavity (1201) is discharged in one direction through the first one-way valve (111).

7. The air extraction device (10) according to claim 6, characterized in that: The bottom wall (1505) of the tube body (15) is provided with a through hole (1502), a connecting piece (16) is installed in the through hole (1502), and the second air hole (1601) is provided on the connecting piece (16); The rod body (1401) is provided with an air channel (1402), and the side wall (1504) of the rod body (1401) is provided with a third air hole (1403). The first end of the air channel (1402) is connected to the second air hole (1601), and the second end of the air channel (1402) is connected to the third air hole (1403).

8. The air extraction device (10) according to claim 7, characterized in that: A locking block (1405) is provided on the outer wall of the first end of the rod body (1401); The connecting member (16) is provided with a connecting column (1603), and the connecting column (1603) is provided with a plug hole (1604), the plug hole (1604) is communicated with the second air hole (1601), the side wall (1504) of the plug hole (1604) is provided with a guide groove (1605) along the axial direction of the plug hole (1604), the side wall (1504) of the connecting column (1603) close to the connecting member (16) is provided with a lock hole (1606), and the lock hole (1606) is opened along the circumference of the connecting column (1603), and the guide groove (1605) is communicated with the lock hole (1606); The rod body (1401) can be selectively inserted into the insertion hole (1604), and the locking block (1405) can be moved along the guide groove (1605) to a set position, and the rod body (1401) can be relatively rotated so that the locking block (1405) moves toward the end of the locking hole (1606).

9. The air extraction device (10) according to claim 4, characterized in that: The air extraction device (10) further comprises an elastic member (17), wherein the elastic member (17) is configured to drive the variable volume body (110) to expand or contract through the restoring force of the elastic member (17).

10. The air extraction device (10) according to claim 1, characterized in that: The first air hole (1202) is connected to a second one-way valve (2104), and the volume cavity (1201) of the cylinder body (12) can inhale air in one direction through the second one-way valve (2104).

11. A nasal aspirator, characterized in that: It comprises a liquid storage tank (20), an air guide pipe (30), and an air extraction device (10) according to any one of claims 1 to 10; The liquid storage tank (20) comprises a chamber (23); a first end of the liquid storage tank (20) is provided with a liquid inlet hole (2101), the liquid inlet hole (2101) is communicated with the chamber (23); a side wall (1504) of the liquid storage tank (20) is provided with a fourth air hole (2103), the fourth air hole (2103) is communicated with the chamber (23); The first end of the air guide tube (30) is connected to the first air hole (1202) of the air extraction device (10), and the second end of the air guide tube (30) is connected to the fourth air hole (2103) of the liquid storage tank (20).

12. The nasal aspirator according to claim 11, characterized in that: The liquid storage tank (20) further comprises a conduit (2102), wherein the conduit (2102) is disposed in the chamber (23), and a first end of the conduit (2102) is connected to the liquid inlet (2101).

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