Negative pressure drainage device

Abstract

The utility model relates to a negative pressure drainage device, which belongs to the field of medical supplies and comprises a cylinder body, a top wall and a bottom wall which are all made of flexible materials, the top end of the cylinder body is fixedly connected with the lower surface of the top wall in a sealing mode, and the bottom end of the cylinder body is fixedly connected with the upper surface of the bottom wall in a sealing mode. A drainage hole and a plurality of discharge holes which are communicated with the interior of the barrel body are formed in the top wall; a first gasket is arranged on the lower surface of the top wall, a second gasket is arranged on the upper surface of the bottom wall, the first gasket and the second gasket are both arranged on the inner side of the barrel body, avoiding holes corresponding to the drainage hole and the multiple discharge holes one to one are formed in the first gasket, and avoiding holes corresponding to the drainage hole and the multiple discharge holes one to one are formed in the second gasket. And a plurality of springs are mounted between the first gasket and the second gasket. The utility model has the beneficial effects that the cylinder body, the top wall and the bottom wall are all made of the same flexible material, so that the heat welding is convenient, the manufacturing procedures are reduced, the cost is saved, and the first gasket and the second gasket are used as linings to increase the strength.

Description

Technical Field

[0001] The utility model relates to the field of medical supplies, in particular to a negative pressure drain. Background Art

[0002] Most of the medical negative pressure drains currently produced on the market are formed by one-time blow molding of a spring built into a polyethylene (PE) material, or by step-by-step welding of polyvinyl chloride (PVC) materials by a high-frequency welding machine in a structural order.

[0003] Among them, the negative pressure drainage device blow-molded from polyethylene (PE) material is not transparent, making it difficult to observe the properties of the drainage liquid in the device body, and it is also impossible to measure the volume; and the negative pressure drainage device made of polyvinyl chloride (PVC) material and a high-frequency welding machine welded step by step in sequence has different welding temperatures due to the different materials of each part, making welding difficult, the manufacturing process complicated, and the defective rate high. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a negative pressure drain which is easy to manufacture and low in cost.

[0005] The utility model solves the above technical problems with the following technical solutions: a negative pressure drainer, comprising a barrel, a top wall and a bottom wall all made of flexible materials, the top end of the barrel is sealed and fixedly connected to the lower surface of the top wall, the bottom end of the barrel is sealed and fixedly connected to the upper surface of the bottom wall, and the top wall is provided with a drainage hole and a plurality of discharge holes communicating with the interior of the barrel;

[0006] A first lining is arranged on the lower surface of the top wall, and a second lining is arranged on the upper surface of the bottom wall. The first lining and the second lining are both arranged on the inner side of the cylinder body. The first lining is provided with avoidance holes corresponding to the drainage holes and the plurality of discharge holes one by one, and a plurality of springs are installed between the first lining and the second lining.

[0007] The beneficial effects of the utility model are as follows: the barrel, top wall and bottom wall are all made of the same flexible material with the same melting point and welding temperature, which is convenient for heat welding, reduces the production process and saves costs; the first lining sheet and the second lining sheet serve as inner liners to increase strength.

[0008] On the basis of the above technical solution, the present invention can also be improved as follows.

[0009] Furthermore, a one-way valve structure for blocking the drainage hole is provided on the lower surface of the top wall.

[0010] The beneficial effect of adopting the above further solution is that the one-way valve structure is used to prevent the liquid in the cylinder from flowing back.

[0011] Furthermore, the one-way valve structure includes a groove opened on the lower surface of the top wall, the drainage hole is located in the groove, a hollow frame is fixedly connected to the inner wall of the drainage hole, a boss is fixedly connected to the side of the hollow frame facing the inside of the cylinder body, an end surface of the boss facing the inside of the cylinder body is higher than the bottom surface of the groove, an elastic diaphragm is arranged on the end surface of the boss, and the elastic diaphragm corresponds to the diameter of the groove and is used to seal the drainage hole.

[0012] The beneficial effect of adopting the above further scheme is: when the negative pressure drainer is pressed, the air inside the negative pressure drainer pushes the elastic diaphragm to close and block the drainage hole, preventing the liquid and air in the negative pressure drainer from being pressed back; when the negative pressure drainer is relaxed, the elastic diaphragm opens to expose the drainage hole.

[0013] Furthermore, a convex column is fixedly connected to an end surface of the boss facing the inside of the cylinder body, and the elastic diaphragm is fixedly mounted on the convex column.

[0014] The beneficial effect of adopting the above further solution is that looseness can be avoided by fixing through insertion of the convex columns.

[0015] Furthermore, the first lining is embedded in the lower surface of the top wall, and the second lining is embedded in the upper surface of the bottom wall.

[0016] The beneficial effect of adopting the above further scheme is: the first lining and the second lining are used as inner linings to increase the strength of the top wall and the bottom wall, which is convenient for installing the spring and the force when pressing. The installation is carried out in an inlay manner, which reduces the manufacturing process and improves efficiency.

[0017] Furthermore, at least two first fixed sockets are fixedly connected to the lower surface of the top wall, and the first lining is fixed on the first fixed sockets;

[0018] At least two second fixed sockets are fixedly connected to the upper surface of the bottom wall, and the second lining is fixed on the second fixed sockets.

[0019] The beneficial effect of adopting the above further solution is: the first lining and the second lining are fixed by a plurality of first fixing sockets and second fixing sockets, so as to avoid shaking and facilitate disassembly.

[0020] Furthermore, a first limiting portion corresponding to the spring is disposed on the lower surface of the first lining, and a second limiting portion corresponding to the first limiting portion is disposed on the upper surface of the second lining, and both ends of the spring are respectively mounted on the first limiting portion and the second limiting portion.

[0021] The beneficial effect of adopting the above further solution is: the spring is limited by the first limiting portion and the second limiting portion to avoid movement during compression.

[0022] Furthermore, the first limiting portion is a first hollow cylinder, which is fixedly connected to the first lining, the second limiting portion is a second hollow cylinder, which is fixedly connected to the second lining, and both ends of the spring are respectively sleeved on the first hollow cylinder and the second hollow cylinder.

[0023] The beneficial effect of adopting the above further solution is that the first hollow cylinder and the second hollow cylinder ensure that the spring does not move around, and the hollow cylinder reduces the occupied space and ensures the usable volume in the cylinder.

[0024] Furthermore, a plurality of first water leakage holes are formed on a side wall of the first hollow cylinder close to the first lining, and a plurality of second water leakage holes are formed on a side wall of the second hollow cylinder close to the second lining.

[0025] The beneficial effect of adopting the above further scheme is that when the negative pressure drain device is filled with liquid, liquid may accumulate in the first hollow cylinder and the second hollow cylinder, and the first leakage hole and the second leakage hole ensure that when the liquid in the cylinder body is poured out, the liquid in the first hollow cylinder and the second hollow cylinder can also flow out normally.

[0026] Furthermore, the barrel is provided with scales.

[0027] The beneficial effect of adopting the above further solution is that it is convenient for medical staff to observe the liquid volume inside the negative pressure drainage device. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is an overall schematic diagram of the utility model;

[0029] Figure 2 This is a schematic diagram of the inner bottom wall of the utility model;

[0030] Figure 3 It is a schematic diagram of the internal top wall of the utility model;

[0031] Figure 4 It is a schematic diagram of the top wall of the utility model;

[0032] Figure 5 This is a schematic diagram of the first lining of the utility model;

[0033] Figure 6 For the utility model Figure 5 A magnified image of point A;

[0034] Figure 7 It is a schematic diagram of the boss of the utility model;

[0035] Figure 8 It is a schematic diagram of the bottom wall of the utility model.

[0036] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0037] 1. Cylinder body; 2. Top wall; 3. Bottom wall; 4. Drainage hole; 5. Discharge hole; 6. First lining; 7. Second lining; 8. Avoidance hole; 9. Spring; 10. Groove; 11. Hollow frame; 12. Boss; 13. Elastic diaphragm; 14. First fixed base; 15. Second fixed base; 16. First hollow cylinder; 17. Second hollow cylinder; 18. First water leakage hole; 19. Second water leakage hole; 20. First circular groove; 21. Second circular groove; 22. Boss. DETAILED DESCRIPTION

[0038] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0039] Example 1

[0040] like Figures 1 to 3 As shown, a negative pressure drainer comprises a barrel 1, a top wall 2 and a bottom wall 3, all of which are made of flexible materials. The top end of the barrel 1 is sealed and fixedly connected to the lower surface of the top wall 2, the bottom end of the barrel 1 is sealed and fixedly connected to the upper surface of the bottom wall 3, and the top wall 2 is provided with a drainage hole 4 and a plurality of discharge holes 5 connected to the inside of the barrel 1;

[0041] A first lining 6 is arranged on the lower surface of the top wall 2, and a second lining 7 is arranged on the upper surface of the bottom wall 3. The first lining 6 and the second lining 7 are both arranged on the inner side of the cylinder body 1. The first lining 6 is provided with avoidance holes 8 corresponding to the drainage holes 4 and the plurality of discharge holes 5 one by one, and a plurality of springs 9 are installed between the first lining 6 and the second lining 7.

[0042] The beneficial effects of this embodiment are: the barrel 1, top wall 2 and bottom wall 3 are all made of the same flexible material with the same melting point and welding temperature, which facilitates heat welding, reduces the production process and saves costs; the first lining 6 and the second lining 7 serve as inner linings to increase strength.

[0043] Specifically, in conventional technology, the top wall 2, the bottom wall 3 and the barrel 1 are made of different materials. Since different materials require different temperatures when welded, the manufacturing is inconvenient, the process is complicated, and the defective rate is high;

[0044] The barrel 1, top wall 2 and bottom wall 3 in the utility model are all made of the same flexible material, the flexible material is PVC soft film, the barrel 1 is PVC transparent soft film, the material is soft and easy to press, and the same material has the same melting point and welding temperature during heat welding, and the process consistency is strong. The drainage hole 4 and the plurality of discharge holes 5 are all manufactured by injection molding and integrated with the top wall 2, which is easy to manufacture;

[0045] The first lining sheet 6 and the second lining sheet 7 serve as inner liners to increase strength, thereby preventing the top wall 2 and the bottom wall 3 from being inconvenient to use due to their excessive softness, and providing better stress resistance when contacting the spring 9 without sinking or misalignment.

[0046] Specific manufacturing process:

[0047] The first step is to embed the first lining 6 into the top wall 2, embed the second lining 7 into the bottom wall 3, and then install the elastic diaphragm 13 on the boss 12, place the spring 9 between the first lining 6 and the second lining 7, and place both ends of the spring 9 on the first limiting part and the second limiting part;

[0048] The second step is to place the transparent cylinder body 1 with scales in a metal ring and between the top wall 2 and the bottom wall 3, so that the cylinder body 1 fits with the top wall 2 and the bottom wall 3. The cylinder body 1 is a PVC soft film, and the metal ring serves as an outer support.

[0049] The third step is to use a welding machine to weld the barrel 1, the top wall 2 and the bottom wall 3.

[0050] The specific usage is:

[0051] The first step is to connect the drainage hole 4 to the part of the patient to be drained through a pipeline;

[0052] Step 2: Open the discharge hole 5, press the top wall 2 by hand to bring the top wall 2 and the bottom wall 3 closer together, the entire negative pressure drainer is flattened, and the air in the negative pressure drainer is discharged from the discharge hole 5;

[0053] The third step is to close the discharge hole 5, release the top wall 2 by hand, the spring 9 pushes the top wall 2 to rise, the negative pressure drainer relaxes, and the suction force generated by the negative pressure sucks out the accumulated fluid in the patient's body from the drainage hole 4.

[0054] Example 2

[0055] like Figures 4 to 7 As shown, preferably, on the basis of Embodiment 1, a one-way valve structure for blocking the drainage hole 4 is provided on the lower surface of the top wall 2 .

[0056] The beneficial effect of adopting the preferred solution in the above embodiment is that the one-way valve structure is used to prevent the liquid in the cylinder body 1 from flowing back.

[0057] Example 3

[0058] like Figures 4 to 7As shown, preferably, on the basis of Examples 1-2, the one-way valve structure includes a groove 10 opened on the lower surface of the top wall 2, the drainage hole 4 is located in the groove 10, and a hollow frame 11 is fixedly connected to the inner wall of the drainage hole 4, and a boss 12 is fixedly connected to the side of the hollow frame 11 facing the inside of the barrel 1, and an end surface of the boss 12 facing the inside of the barrel 1 is higher than the bottom surface of the groove 10, and an elastic diaphragm 13 is arranged on the end surface of the boss 12, and the elastic diaphragm 13 corresponds to the diameter of the groove 10 and is used to block the drainage hole 4.

[0059] The beneficial effect of adopting the preferred scheme in the above embodiment is: when the negative pressure drainer is pressed, the air inside the negative pressure drainer pushes the elastic diaphragm 13 to close and block the drainage hole 4, preventing the liquid and air in the negative pressure drainer from being pressed back; when the negative pressure drainer is relaxed, the elastic diaphragm 13 opens, exposing the drainage hole 4.

[0060] Specifically, the boss 12 and the elastic diaphragm 13 are located at the center of the drainage hole 4. When the staff presses the top wall 2 of the negative pressure drainer, the air inside the drainer pushes the edge of the elastic diaphragm 13 to move upward, and the edge of the elastic diaphragm 13 fits in the groove 10 to block the drainage hole 4. The hollow frame 11 blocks the elastic diaphragm 13 to prevent the elastic diaphragm 13 from falling into the drainage hole 4. The excess gas in the negative pressure drainer is discharged from the discharge hole 5.

[0061] The drainage hole 4 is connected to the part of the patient where the accumulated fluid is to be drained. When the spring 9 pushes the negative pressure drainer to expand, the negative pressure draws the accumulated fluid into the negative pressure drainer.

[0062] It should be noted that the bottom end surface of the boss 12 is higher than the bottom surface of the groove 10, and the elastic diaphragm 13 is installed on the boss 12. Under normal conditions, there is a certain gap between the elastic diaphragm 13 and the bottom surface of the groove 10 and the drainage hole 4. This gap effectively increases the air intake efficiency of the drainage hole 4 when the negative pressure drainer is diastolic, so that the negative pressure drainer is rapidly diastolic;

[0063] If the elastic diaphragm 13 is completely in contact with the bottom surface of the groove 10 under normal conditions, when the negative pressure drain device is relaxed, it will be more difficult for the gas outside the negative pressure drain device to push the edge of the elastic diaphragm 13 away, and the air intake efficiency will be extremely low.

[0064] In addition, when the top wall 2 is pressed to compress the negative pressure drainer, because the elastic diaphragm 13 has good elasticity, the air inside the negative pressure drainer will push the edge of the elastic diaphragm 13 to move upward, so the elastic diaphragm 13 can still normally close the drainage hole 4.

[0065] As a parallel technical solution of the above embodiment, other similar one-way valve structures are conventional technologies and will not be described in detail here.

[0066] Example 4

[0067] like Figures 4 to 7 As shown, preferably, on the basis of embodiments 1-3, a boss 22 is fixedly connected to an end surface of the boss 12 facing the inside of the barrel 1 , and the elastic diaphragm 13 is fixedly mounted on the boss 22 .

[0068] The beneficial effect of adopting the preferred solution in the above embodiment is that the projections 22 are inserted and fixed to avoid loosening.

[0069] Specifically, the elastic membrane 13 is made of silicone, which has good elasticity, is soft and non-irritating.

[0070] Example 5

[0071] like Figures 1 to 3 As shown, preferably, on the basis of embodiments 1-4, the first lining 6 is embedded in the lower surface of the top wall 2, and the second lining 7 is embedded in the upper surface of the bottom wall 3.

[0072] The beneficial effect of adopting the preferred solution in the above embodiment is that the first lining 6 and the second lining 7 serve as inner liners to increase the strength of the top wall 2 and the bottom wall 3, making it easier to install the spring 9 and to bear the force when pressed.

[0073] Specifically, the barrel 1, the top wall 2 and the bottom wall 3 are fixed by welding, while the first lining 6 and the second lining 7 are installed on the top wall 2 and the bottom wall 3 by inlaying. Compared with the welding process, the inlay installation is more convenient, reduces the number of steps, and has high manufacturing efficiency of the finished product.

[0074] Example 6

[0075] like Figure 5 and Figure 8 As shown, preferably, on the basis of embodiments 1-5, at least two first fixed seats 14 are fixedly connected to the lower surface of the top wall 2, and the first lining 6 is fixed on the first fixed seats 14;

[0076] At least two second fixing seats 15 are fixedly connected to the upper surface of the bottom wall 3 , and the second lining 7 is fixed on the second fixing seats 15 .

[0077] The beneficial effect of adopting the preferred solution in the above embodiment is: the first lining 6 and the second lining 7 are fixed by a plurality of first fixing seats 14 and second fixing seats 15 to avoid shaking and facilitate disassembly.

[0078] Specifically, a first circular groove 20 is further provided on the lower surface of the top wall 2, and the first fixed clamping seat 14 is located in the first circular groove 20. The diameter of the first circular groove 20 is the same as that of the first lining 6. After the first lining 6 is embedded in the first circular groove 20, it is clamped on the first fixed clamping seat 14 to ensure that the lining is accurately positioned.

[0079] A second circular groove 21 is formed on the upper surface of the bottom wall 3, and the second fixed clamping seat 15 is located in the second circular groove 21. The diameter of the second circular groove 21 is the same as that of the second lining 7. The second lining 7 is embedded in the second circular groove 21 and clamped on the second fixed clamping seat 15 to ensure that the lining is accurately positioned.

[0080] By defining a straight line between at least two first fixing seats 14 , the first lining 6 can be prevented from rotating in the first circular groove 20 ; the same is true for the second fixing seats 15 .

[0081] Example 7

[0082] like Figures 2 to 3 As shown, preferably, on the basis of embodiments 1-6, a first limiting portion corresponding one-to-one to the spring 9 is provided on the lower surface of the first lining 6, and a second limiting portion corresponding one-to-one to the first limiting portion is provided on the upper surface of the second lining 7, and both ends of the spring 9 are respectively installed on the first limiting portion and the second limiting portion.

[0083] The beneficial effect of adopting the preferred solution in the above embodiment is that the spring 9 is limited by the first limiting portion and the second limiting portion to avoid movement during compression.

[0084] Specifically, the number of springs 9 can be one arranged at the center of the circle, or a plurality of springs 9 can be evenly arranged around the center of the circle inside the negative pressure drainer.

[0085] Example 8

[0086] like Figure 5 and Figure 8 As shown, preferably, on the basis of embodiments 1-7, the first limiting portion is a first hollow cylinder 16, which is fixedly connected to the first lining 6, and the second limiting portion is a second hollow cylinder 17, which is fixedly connected to the second lining 7, and the two ends of the spring 9 are respectively mounted on the first hollow cylinder 16 and the second hollow cylinder 17.

[0087] The beneficial effects of adopting the preferred solution in the above embodiment are: the first hollow cylinder 16 and the second hollow cylinder 17 ensure that the spring 9 does not move around, and the hollow cylinder reduces the occupied space, ensuring the usable volume in the cylinder body 1.

[0088] Specifically, according to the number and position of the springs 9, the first hollow cylinder 16 can be located at the center of the circle, enclosing the avoidance hole 8 at the drainage hole 4, and the second hollow cylinder 17 below is always aligned with the position of the first hollow cylinder 16;

[0089] The first hollow cylinder 16 and the second hollow cylinder 17 may also be located at an eccentric position, and a plurality of first hollow cylinders 16 and second hollow cylinders 17 are evenly arranged around the center of the circle inside the negative pressure drain;

[0090] If located at an eccentric position, both the first limiting portion and the second limiting portion may be solid cylinders;

[0091] If it is located at the center of the circle, the second limiting portion can be a hollow cylinder or a solid column, and the first limiting portion must be a hollow cylinder to avoid blocking the drainage hole 4 and the avoidance hole 8 from being used.

[0092] Example 9

[0093] like Figure 5 and Figure 8 As shown, preferably, on the basis of embodiments 1-8, a plurality of first water leakage holes 18 are opened on the side wall of the first hollow cylinder 16 close to the first lining 6, and a plurality of second water leakage holes 19 are opened on the side wall of the second hollow cylinder 17 close to the second lining 7.

[0094] The beneficial effect of adopting the preferred scheme in the above embodiment is that when the negative pressure drain device is filled with liquid, liquid may accumulate in the first hollow cylinder 16 and the second hollow cylinder 17, and the first leakage hole 18 and the second leakage hole 19 ensure that when the staff pours the liquid in the cylinder body 1, the liquid in the first hollow cylinder 16 and the second hollow cylinder 17 can also flow out normally, which is convenient for cleaning.

[0095] Example 10

[0096] like Figure 1 As shown, preferably, based on embodiments 1-9, the barrel 1 is provided with scales.

[0097] The beneficial effect of adopting the preferred solution in the above embodiment is that it is convenient for medical staff to observe the liquid volume inside the negative pressure drainage device.

[0098] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0099] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0100] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0101] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0102] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0103] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A negative pressure drainage device, characterized in that: The invention comprises a barrel (1), a top wall (2) and a bottom wall (3) all made of flexible materials, the top end of the barrel (1) being sealed and fixedly connected to the lower surface of the top wall (2), the bottom end of the barrel (1) being sealed and fixedly connected to the upper surface of the bottom wall (3), and the top wall (2) being provided with a drainage hole (4) and a plurality of discharge holes (5) communicating with the interior of the barrel (1); A first lining (6) is arranged on the lower surface of the top wall (2), and a second lining (7) is arranged on the upper surface of the bottom wall (3). The first lining (6) and the second lining (7) are both arranged on the inner side of the cylinder body (1). The first lining (6) is provided with avoidance holes (8) corresponding to the drainage holes (4) and the plurality of discharge holes (5) one by one. A plurality of springs (9) are installed between the first lining (6) and the second lining (7).

2. A negative pressure drainage device according to claim 1, characterized in that: A one-way valve structure for blocking the drainage hole (4) is provided on the lower surface of the top wall (2).

3. A negative pressure drainage device according to claim 2, characterized in that: The one-way valve structure comprises a groove (10) formed on the lower surface of the top wall (2); the drainage hole (4) is located in the groove (10); a hollow frame (11) is fixedly connected to the inner wall of the drainage hole (4); a boss (12) is fixedly connected to the side of the hollow frame (11) facing the inside of the barrel (1); an end surface of the boss (12) facing the inside of the barrel (1) is higher than the bottom surface of the groove (10); an elastic diaphragm (13) is arranged on the end surface of the boss (12); the elastic diaphragm (13) corresponds to the diameter of the groove (10) and is used to block the drainage hole (4).

4. A negative pressure drainage device according to claim 3, characterized in that: A convex column (22) is fixedly connected to an end surface of the boss (12) facing the inside of the barrel (1), and the elastic diaphragm (13) is fixedly mounted on the convex column (22).

5. A negative pressure drainage device according to claim 1, characterized in that: The first lining (6) is embedded in the lower surface of the top wall (2), and the second lining (7) is embedded in the upper surface of the bottom wall (3).

6. A negative pressure drainage device according to claim 5, characterized in that: At least two first fixed clamping seats (14) are fixedly connected to the lower surface of the top wall (2), and the first lining (6) is fixed on the first fixed clamping seats (14); At least two second fixed sockets (15) are fixedly connected to the upper surface of the bottom wall (3), and the second lining (7) is fixed on the second fixed sockets (15).

7. The negative pressure drainage device according to claim 1, characterized in that: The lower surface of the first lining (6) is provided with a first limiting portion corresponding one-to-one to the spring (9), and the upper surface of the second lining (7) is provided with a second limiting portion corresponding one-to-one to the first limiting portion, and the two ends of the spring (9) are respectively mounted on the first limiting portion and the second limiting portion.

8. A negative pressure drainage device according to claim 7, characterized in that: The first limiting portion is a first hollow cylinder (16), and the first hollow cylinder (16) is fixedly connected to the first lining (6); the second limiting portion is a second hollow cylinder (17), and the second hollow cylinder (17) is fixedly connected to the second lining (7); and the two ends of the spring (9) are respectively sleeved on the first hollow cylinder (16) and the second hollow cylinder (17).

9. A negative pressure drainage device according to claim 8, characterized in that: A plurality of first water leakage holes (18) are provided on the side wall of the first hollow cylinder (16) close to the first lining (6), and a plurality of second water leakage holes (19) are provided on the side wall of the second hollow cylinder (17) close to the second lining (7).

10. A negative pressure drainage device according to any one of claims 1 to 9, characterized in that: The barrel (1) is provided with scales.

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