Negative pressure pump and negative pressure wader

Abstract

The utility model provides a negative pressure pump and negative pressure drainage device, negative pressure pump includes: siphon, piston, first check valve, second check valve and handle, the piston sets up inside siphon, and can slide movement between low pressure position and high pressure position along the axial direction of siphon, the piston and siphon mutually cooperate and form sealed cavity, first check valve sets up on siphon, is used for preventing the air outside sealed cavity from entering sealed cavity when piston moves to low pressure position, second check valve sets up on siphon, is used for preventing the air in sealed cavity from flowing out sealed cavity when piston moves to high pressure position, handle is installed on siphon through connecting portion, and handle can move between folding position and extension position relative to siphon around connecting portion, when not needing to extract secretion, can rotate handle to folding position, make handle and siphon mutually overlap, reduce the length of negative pressure pump, improve the portability of equipment.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and more specifically, to a negative pressure pump and a negative pressure drainage device. Background Technology

[0002] If there is excessive nasal mucosal secretion and it is not cleaned in time, impurities and dust in the air will mix with the secretions when breathing. After the secretions dry, they form nasal crusts, which may block the nasal cavity and thus affect breathing function.

[0003] A nasal aspirator is a device used to remove nasal secretions. For example, Chinese utility model patent application (application number: 202411786997.8), Chinese utility model patent (application number: 201921535471.7), and Chinese utility model patent (application number: 202223357339.6) all disclose a nasal aspirator.

[0004] The nasal aspirator mainly consists of two parts: a nasal plug suction head unit and a negative pressure suction unit. The nasal plug suction head unit is placed at the nostril and is used to cooperate with the nasal cavity to form a sealed structure. The negative pressure suction unit is connected to the nasal plug suction head unit through a connecting tube. When the negative pressure suction unit generates negative pressure, it can suction out the flowing mucus in the nasal cavity to avoid leaving it in the nasal cavity and obstructing breathing.

[0005] Current nasal aspirators typically generate negative pressure using a sliding piston. When the piston stroke is short, the resulting negative pressure is low, making it difficult to remove nasal mucus. When the piston stroke is long, the negative pressure suction unit becomes too long, resulting in poor product portability. Utility Model Content

[0006] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a negative pressure pump and a negative pressure drainage device to overcome the above-mentioned disadvantages.

[0007] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a negative pressure pump, comprising: a pump cylinder, a piston, a first check valve, a second check valve, and a handle; the piston is disposed inside the pump cylinder and can slide between a low-pressure position and a high-pressure position along the axial direction of the pump cylinder; the piston and the pump cylinder cooperate to form a sealed cavity; the first check valve is disposed on the pump cylinder to prevent air outside the sealed cavity from entering the sealed cavity when the piston moves to the low-pressure position; the second check valve is disposed on the pump cylinder to prevent air inside the sealed cavity from flowing out of the sealed cavity when the piston moves to the high-pressure position; the handle is mounted on the pump cylinder through a connecting part, and the handle can move around the connecting part relative to the pump cylinder between a folded position and an extended position.

[0008] In one embodiment, the pump has a first end and a second end opposite to each other along its axial direction; the connecting portion is closer to the second end than to the first end.

[0009] In one embodiment, when the handle is in the extended position, the handle is closer to the second end in the axial direction of the pump; when the handle is in the folded position, the handle is closer to the first end in the axial direction of the pump.

[0010] In one embodiment, the handle is U-shaped or The design includes two connecting parts, which are respectively located at both ends of the radial direction of the pump; the two free ends of the handle are respectively mounted on the pump via the two connecting parts.

[0011] In one embodiment, the connecting portion is provided with a first limiting member and a second limiting member; the handle is provided with a third limiting member; when the handle is in the folded position, the third limiting member engages with the first limiting member to restrict the swing of the handle; when the handle is in the extended position, the third limiting member engages with the second limiting member to restrict the swing of the handle.

[0012] In one embodiment, the connecting part has a rotating hole; the handle is provided with a rotating shaft; the rotating shaft is rotatably inserted into the rotating hole; the first limiting member and the second limiting member are respectively distributed on both sides of the rotating hole along the axial direction of the pump.

[0013] In one embodiment, there are two third limiting members, which are respectively disposed at both ends of the rotating shaft.

[0014] In one embodiment, the first limiting member and the second limiting member are limiting holes, and the third limiting member is a limiting post; or, the first limiting member and the second limiting member are limiting posts, and the third limiting member is a limiting hole.

[0015] In one embodiment, the piston is further provided with a handle; the handle is fixedly connected to the piston to pull the piston to move along the axial direction of the pump.

[0016] In one embodiment, the handle is U-shaped or The handle is designed such that its two free ends extend radially along the cylinder and are fixedly connected to both ends of the piston.

[0017] In one embodiment, a return element is further included, which is used to move the piston from the second end to the first end, and / or to give the piston a tendency to move towards the first end.

[0018] In one embodiment, the return component is specifically a compression elastic component, one end of which abuts against the piston; the other end of which abuts against the second end.

[0019] In one embodiment, the return component is specifically a tensile elastic component, one end of which is connected to the piston, and the other end of which is connected to the first end.

[0020] Secondly, this application provides a negative pressure drainage device, comprising: a negative pressure pump as described in any one of the first aspects; a suction mechanism for suctioning secretions from the nasal cavity; wherein the suction mechanism is connected to the negative pressure pump via a connecting tube.

[0021] In one embodiment, the suction mechanism includes: a suction head, a liquid extraction tube, and a storage tank; one end of the liquid extraction tube is detachably connected to the suction head; the other end of the liquid extraction tube is inserted into the interior of the storage tank; the suction head is detachably connected to the storage tank; the suction head has an air guide hole; the air guide hole communicates with the storage tank through the liquid extraction tube; and the connecting tube communicates with the storage tank.

[0022] In one embodiment, the storage tank has a third end and a fourth end opposite each other along its axial direction; the suction head is detachably connected to the third end; and the other end of the liquid extraction tube is closer to the fourth end than the third end when inserted into the storage tank.

[0023] In one embodiment, the storage tank has a suction manifold on its side wall; the connecting pipe is connected to the storage tank through the suction manifold; the suction manifold is closer to the third end than the other end of the liquid extraction pipe.

[0024] In one embodiment, the suction head is made of liquid silicone material.

[0025] In summary, this utility model has the following beneficial effects: By setting a handle that can rotate around the connecting part on the pump, the handle can be switched to the extended position when the negative pressure pump is needed to extract secretions, making it easy to operate; when the negative pressure pump is not needed, the handle can be switched to the folded position, so that the handle and the pump overlap each other, thereby reducing the size of the negative pressure pump in the axial direction, which helps to improve the portability and ease of use of the device. Attached Figure Description

[0026] Figure 1 This is a three-dimensional structural diagram of the negative pressure drainage device of this utility model;

[0027] Figure 2This is a cross-sectional schematic diagram of the internal structure of the negative pressure pump of this utility model;

[0028] Figure 3 This is an exploded view of the internal structure of the negative pressure pump of this utility model;

[0029] Figure 4 for Figure 3 Enlarged diagram of part A in the diagram;

[0030] Figure 5 for Figure 3 Enlarged diagram of part B in the diagram;

[0031] Figure 6 This is a schematic diagram of the negative pressure pump of this utility model in the state of pulling the handle upward;

[0032] Figure 7 This is a schematic diagram of the internal cross-section of the negative pressure pump of this utility model when the handle is pulled upwards.

[0033] Figure 8 This is a schematic diagram of the handle of the negative pressure pump of this utility model in the folded state;

[0034] Figure 9 This is a schematic diagram of the bottom surface of the negative pressure pump of this utility model;

[0035] Figure 10 This is a three-dimensional schematic diagram of the first suction mechanism of this utility model;

[0036] Figure 11 This is a three-dimensional schematic diagram of the second suction mechanism of this utility model;

[0037] Figure 12 This is an exploded view of the internal structure of the suction mechanism of this utility model;

[0038] Figure 13 This is a schematic cross-sectional view of the internal structure of the suction mechanism of this utility model;

[0039] In the diagram: 1. Suction mechanism; 11. Suction head; 12. Liquid suction pipe; 13. Storage tank; 14. Third end; 15. Fourth end; 16. Suction manifold; 2. Negative pressure pump; 201. Pump; 202. Piston; 203. First check valve; 204. Second check valve; 205. Handle; 206. First end; 207. Second end; 208. Connecting part; 209. First limiting member; 210. Second limiting member; 211. Third limiting member; 212. Rotating hole; 213. Rotating shaft; 214. Handle; 215. Returning member; 216. Positioning groove; 217. Positioning post; 218. Sealing cavity; 219. Top cover; 3. Connecting pipe. Detailed Implementation

[0040] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of 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. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0041] In this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" of the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature. The terms "vertical," "horizontal," "left," "right," "above," "below," and similar expressions are for illustrative purposes only and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed or operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0042] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0043] Example 1

[0044] like Figure 1 As shown, to solve the above problems, this utility model provides a negative pressure pump 2, which is applied to a negative pressure drainage device. The negative pressure drainage device is used to extract secretions from the nasal cavity and also includes an suction mechanism 1. The negative pressure pump and the suction mechanism are connected by a connecting pipe. The negative pressure pump 2 and the suction mechanism 1 are connected to each other by a connecting pipe 3. In actual use, the suction mechanism 1 is sealed and fitted to the user's nostril, forming a sealed environment between the suction mechanism 1 and the nasal cavity. Then, the negative pressure pump 2 is controlled to generate negative pressure, which reduces the air pressure in the suction mechanism 1 and draws air from the nasal cavity, thereby extracting the liquid secretions from the nasal cavity to relieve the user's discomfort.

[0045] like Figure 2 , Figure 3 As shown, the negative pressure pump 2 includes a pump 201 and a piston 202. The pump 201 is cylindrical. In this embodiment, the pump 201 is defined with a first end 206 and a second end 207 opposite to each other along its axial direction. The first end 206 is connected to the connecting pipe 3. The piston 202 is movably disposed in the pump 201 and slides along the axial direction of the pump 201. The piston 202 divides the interior of the pump 201 into two parts. The part near the first end 206 forms a sealed cavity 218, and the part near the second end 207 is connected to the outside atmosphere. When the piston 202 slides from the first end 206 to the second end 207, the volume of the sealed cavity 218 continuously increases, and the air pressure inside it decreases as the piston 202 moves. After the low-pressure environment is transmitted to the suction mechanism 1 through the connecting pipe 3, the negative pressure generated by the sealed structure can be used to extract the liquid secretions in the nasal cavity from the nasal cavity.

[0046] like Figure 2 , Figure 7 As shown, for ease of description, based on the pressure changes within the sealed cavity, the position of piston 202 at the first end 206 is referred to as the high-pressure position, and the position of piston 202 at the second end 207 is referred to as the low-pressure position. Correspondingly, the process of piston 202 moving from the first end 206 to the second end 207 is called the decompression stage, and the process of piston 202 moving from the second end 207 to the first end 206 is called the pressurization stage. During the decompression stage, the volume within the sealed cavity 218 increases to generate negative pressure, and some gas is drawn from the nasal cavity, thereby causing the gas in the nasal cavity to... Secretions flow out of the nasal cavity; during the pressurization phase, the volume of the sealing cavity 218 decreases, and the air pressure inside the sealing cavity 218 gradually recovers or even exceeds the original air pressure. In order to prevent the air pressure inside the sealing cavity 218 from rushing into the nasal cavity along the connecting pipe 3 during the piston 202 reset process, a second check valve 204 is provided on the pump 201. The second check valve 204 is located at the connection between the connecting pipe 3 and the pump 201. When the air pressure inside the sealing cavity 218 is too high, the check valve is used to prevent the gas inside the sealing cavity 218 from rushing into the nasal cavity and causing harm to the user. In order to allow the gas in the sealed cavity 218 to be discharged smoothly and the piston 202 to return to the first end 206, the pump 201 is also provided with a pressure relief hole to discharge excess gas in the pump 201. If the pressure relief hole is open, then during the decompression stage, external air will enter the sealed cavity 218 and affect the decompression effect. Therefore, the pump 201 is also provided with a first check valve 203, which covers the pressure relief hole to prevent external air from entering the sealed cavity 218.

[0047] like Figure 3As shown, in this embodiment, the first check valve 203 is a silicone sealing sheet. The first check valve 203 is located outside the sealing cavity 218 and covers the pressure relief hole. During the decompression stage, the first check valve 203 can block the pressure relief hole from the outside, preventing gas from entering the sealing cavity 218 from the pressure relief hole. The second check valve 204 is also a silicone sealing sheet. The second check valve 204 is located inside the sealing cavity 218 and covers the connection between the connecting pipe 3 and the pump 201. During the decompression stage, the air pressure in the sealing cavity 218 decreases, and the air in the nasal cavity passes through the connecting pipe 3 and then through the second check valve 204, causing the check valve to deform slightly before entering the sealing cavity 218. During the pressurization stage, the air pressure in the sealing cavity 218 increases, and the second check valve 204 covers the connection to prevent gas leakage to the suction mechanism 1. After the first check valve 203 deforms slightly, the gas in the sealing cavity 218 flows to the external environment through the pressure relief hole.

[0048] like Figure 8 As shown, in order to control the sliding of piston 202, negative pressure pump 2 also includes: handle 205 and lever 214; the handle 205 and lever 214 are both roughly "U" shaped or The design incorporates a handle 205 whose two free ends are mounted on the sidewalls of the pump 201 via connecting portions 208. The handle 205 can move relative to the pump 201 between a folded position and an extended position around the connecting portions 208. The connecting portions 208 can be integrally formed with the sidewalls of the pump 201 to enhance the strength of the rotating structure, or they can be separate from the sidewalls of the pump 201. The connecting portions 208 are positioned closer to the second end 207. When the handle 205 is in the folded position, it is closer to the first end 206 in the axial direction of the pump 201, with most of its length overlapping the pump 201 to reduce the length of the negative pressure pump 2 and facilitate portability of the suction structure. When the handle 205 is in the extended position, it is closer to the second end 207, with most of its length extending beyond the second end 207. The two free ends of the handle 214 are fixedly connected to the radial ends of the piston 202 to pull the piston 202 parallel to move it along the axial direction of the pump 201. In actual use, first rotate the handle 205 to the extended position, then grasp the handle 205 with your hand, hook your fingers around the handle 214 and pull it towards the handle 205 to move the piston 202 from the first end 206 to the second end 207.

[0049] like Figure 4 , Figure 5As shown, the handle 205 and the pump 201 are rotatably connected. In order to keep the handle 205 stationary in the folded or extended position and to prevent the handle 205 from rotating arbitrarily and affecting its use, a first limiting member 209 and a second limiting member 210 are provided on the connecting part 208; a third limiting member 211 is provided on the handle 205. When the handle 205 is in the folded position, the third limiting member 211 engages with the first limiting member 209 to limit the swing of the handle 205; when the handle 205 is in the extended position, the third limiting member 211 engages with the second limiting member 210 to limit the swing of the handle 205. A rotating hole 212 is provided on the connecting part 208; a rotating shaft 213 is provided on the handle 205; the rotating shaft 213 is rotatably inserted into the rotating hole 212; the first limiting member 209 and the second limiting member 210 are respectively distributed on both sides of the rotating hole 212 along the axial direction of the pump 201. Therefore, regardless of whether the handle 205 is rotated to the folded position or the extended position, the third limiting member 211 can engage with at least the first limiting member 209 or the second limiting member 210 to limit the handle 205. Furthermore, there can be two third limiting members 211, with the two third limiting members 211 respectively provided on both sides of the rotating shaft 213, so that the third limiting members 211 can simultaneously engage with the first limiting member 209 and the second limiting member 210 to form a limiting action.

[0050] The first limiting member 209 and the second limiting member 210 are limiting holes, and the third limiting member 211 is a limiting post. When the handle 205 rotates, the limiting post rotates with the handle 205 and is engaged in the corresponding limiting hole, which can limit the rotation of the handle 205. Alternatively, the first limiting member 209 and the second limiting member 210 are limiting posts, and the third limiting member 211 is a limiting hole. The limiting hole rotates with the handle 205 and is fitted onto the corresponding limiting post, which can also limit the rotation of the handle 205.

[0051] like Figure 2 , Figure 3 and Figure 7 As shown, the pump 201 also has a return member 215 inside. The return member 215 is used to move the piston 202 from the second end 207 to the first end 206. When the handle 214 is used to pull the piston 202, the force exerted on the piston 202 by the return member 215 needs to be overcome so that the piston 202 moves axially from the first end 206 to the second end 207. When the handle 214 is not pulled, the return member 215 will apply a return force to the piston 202 so that the piston 202 automatically returns to the first end 206. The return member 215 is also used to give the piston 202 a tendency to move towards the first end 206, so that the handle 214 on the piston 202 can remain accommodated inside the pump 201 when not in use.

[0052] The return component 215 is specifically a compression elastic component, such as a compression spring. One end of the compression elastic component abuts against the piston 202; the other end abuts against the second end 207. A positioning post 217 is provided at the center of the piston 202, and the spring is sleeved on the positioning post 217 for positioning. A positioning groove 216 is provided on the top cover 219 of the pump 201, and the other end of the spring is inserted into the positioning groove 216 for positioning. The return component 215 can also be set as a tension elastic component (not shown in the figure), such as a rubber band or a tension spring. The tension elastic component needs to be set between the piston 202 and the first end 206, and the tension elastic force is used to maintain the movement of the piston 202 toward the first end 206.

[0053] The negative pressure pump 2 in this embodiment can also be connected to different devices through a connecting pipe to perform negative pressure suction function, such as connecting to a negative pressure suction head to suction secretions in the throat, and is not limited to suctioning secretions in the nasal cavity.

[0054] Example 2

[0055] This embodiment provides a negative pressure drainage device for aspirating secretions from the nasal cavity, including a negative pressure pump 2 as described in Embodiment 1, differing from Embodiment 1 in the suction mechanism 1. Figures 10-13 As shown, the suction mechanism 1 includes: a suction head 11, a suction tube 12, and a storage tank 13. The suction head 11 is made of liquid silicone material and is used to contact the nostrils, providing a soft and skin-friendly feel. The suction head 11 has an air guide hole that can draw air and secretions from the nasal cavity. The air guide hole is connected to the storage tank 13 through the suction tube 12. The storage tank 13 is a cylindrical shape with one open end and has a space inside for containing secretions. In the axial direction of the storage tank 13, the open end of the storage tank 13 is the third end 14, and the non-open end of the storage tank 13 is the fourth end 15. The suction head 11 is fitted onto the opening of the third end 14 and is sealed to the opening of the third end 14. To prevent secretions from flowing into the connecting tube 3 and becoming difficult to clean, the suction tube 12 is connected to the air guide hole on the suction head 11 and inserted into the fourth end 15 of the storage tank 13. An suction manifold 16 is also installed on the side wall of the storage tank 13, closer to the third end 14. The negative pressure airflow in the storage tank 13 flows first towards the fourth end 15 and then towards the third end 14. Secretions sucked into the suction tube 12 will fall to the bottom of the storage tank 13 due to inertia and will not enter the connecting tube 3. During cleaning, only the storage tank 13 needs to be cleaned.

[0056] like Figure 13 As shown, in this embodiment, the intake manifold 16 is disposed on the side wall of the storage tank 13, and the connecting pipe 3 is connected to the storage tank 13 through the intake manifold 16. Figure 10 , Figure 11As shown, the inhalation head 11 and the storage tank 13 are detachably connected, and different sizes of inhalation heads 11 can be provided to adapt to different sizes of nasal cavities. In addition, the inhalation head 11 can also be set with a specific shape for use in various animals, rather than being limited to humans.

[0057] 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.

[0058] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A negative pressure pump, characterized in that, include: Pump, piston, first check valve, second check valve, and handle; The piston is disposed inside the pump cylinder and can slide between a low-pressure position and a high-pressure position along the axial direction of the pump cylinder; the piston and the pump cylinder cooperate to form a sealed cavity. The first check valve is disposed on the pump to prevent air from entering the sealing cavity when the piston moves to the low-pressure position; The second check valve is provided on the pump to prevent air from flowing out of the sealing cavity when the piston moves to the high-pressure position. The handle is mounted on the pump via a connecting part, and the handle is movable about the connecting part relative to the pump between a folded position and an extended position.

2. The negative pressure pump according to claim 1, characterized in that, Along the axial direction of the pump, the pump is provided with a first end and a second end opposite to each other; Compared to the first end, the connecting portion is closer to the second end; In the axial direction of the pump, the handle is closer to the second end; When the handle is in the folded position, the handle is closer to the first end in the axial direction of the pump.

3. The negative pressure pump according to claim 1, characterized in that, The handle is U-shaped or The design includes two connecting parts, which are respectively located at both ends of the radial direction of the pump. The two free ends of the handle are respectively mounted on the pump via the two connecting parts.

4. The negative pressure pump according to claim 1, characterized in that, The connecting part is provided with a first limiting member and a second limiting member; the handle is provided with a third limiting member; When the handle is in the folded position, the third limiting member engages with the first limiting member to restrict the swing of the handle; When the handle is in the extended position, the third limiting member engages with the second limiting member to restrict the swinging of the handle; The connecting part is provided with a rotating hole; the handle is provided with a rotating shaft; the rotating shaft is rotatably inserted into the rotating hole; The first limiting member and the second limiting member are respectively distributed on both sides of the rotating hole along the axial direction of the pump. The number of the third limiting members is two, and the two third limiting members are respectively disposed at both ends of the rotating shaft.

5. The negative pressure pump according to claim 1, characterized in that, The piston is also provided with a handle; the handle is fixedly connected to the piston to pull the piston to move along the axial direction of the pump. The handle is U-shaped or The handle is designed such that its two free ends extend radially along the cylinder and are fixedly connected to both ends of the piston.

6. The negative pressure pump according to claim 2, characterized in that, It also includes a return element, which is used to move the piston from the second end to the first end, and / or to give the piston a tendency to move towards the first end.

7. The negative pressure pump according to claim 6, characterized in that, The return component is specifically a compression elastic assembly, one end of which abuts against the piston; the other end of which abuts against the second end. Alternatively, the return component may be a tensile elastic component, one end of which is connected to the piston, and the other end of which is connected to the first end.

8. A negative pressure drainage device, characterized in that, include: The negative pressure pump as described in any one of claims 1-7; A suction device used to remove secretions from the nasal cavity; The suction mechanism is connected to the negative pressure pump via a connecting pipe; The suction mechanism includes: a suction head, a liquid suction tube, and a storage tank; One end of the liquid extraction tube is detachably connected to the suction head; the other end of the liquid extraction tube is inserted into the storage tank. The suction head is detachably connected to the storage tank; The suction head is provided with an air guide hole; the air guide hole is connected to the storage tank through the liquid extraction tube; The connecting pipe is connected to the storage tank.

9. The negative pressure drainage device according to claim 8, characterized in that, Along the axial direction of the storage tank, the storage tank is provided with a third end and a fourth end opposite to each other; The suction head is detachably connected to the third end; When the other end of the suction tube is inserted into the storage tank, it is closer to the fourth end than the third end. The storage tank is provided with an air intake manifold on its side wall; the connecting pipe is connected to the storage tank through the air intake manifold. Compared to the other end of the suction tube, the intake manifold is closer to the third end.

10. The negative pressure drainage device according to claim 8, characterized in that, The suction head is made of liquid silicone material.

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