Multifunctional negative pressure drainage device

Abstract

The invention relates to a multifunctional negative pressure drainage device which comprises a liquid storage tank, a drainage pipe and a vacuumizing pipe are arranged at the top of the liquid storage tank, the vacuumizing pipe is provided with a plug, the liquid storage tank is of a transparent structure and is provided with scale marks for displaying the volume of liquid in the liquid storage tank, and a liquid drainage nozzle is arranged at the bottom of the liquid storage tank. A liquid discharge valve is arranged on the liquid discharge nozzle, and the liquid storage tank is further provided with a sampling structure. The invention aims to provide the multifunctional negative pressure drainage apparatus, and the problems that the negative pressure drainage apparatus cannot know the liquid flow, discharge liquid in a vertical state and sample without breaking vacuum are solved.

Description

Technical Field

[0001] The invention relates to the technical field of medical supplies, and in particular to a multifunctional negative pressure drain. Background Art

[0002] Negative pressure drainage device is a medical device widely used in the medical field. It is mainly used for drainage after surgery or trauma, helping patients to expel blood, body fluids, pus and other secretions in the body to reduce the risk of infection and promote wound healing. The negative pressure drainage device includes a liquid storage tank, and a drainage tube and a vacuum tube are provided on the top of the liquid storage tank. The vacuum tube is provided with a plug. The existing negative pressure drainage device has the following shortcomings: the liquid in the liquid storage tank can only be poured out by inverting; the amount of liquid in the liquid storage tank cannot be known; the vacuum needs to be broken when sampling, resulting in drainage interruption; due to the light weight of the liquid storage tank, it is easy to tip over when placed on the ground. Summary of the invention

[0003] The present invention aims to provide a multifunctional negative pressure drainer, which solves the problems that the negative pressure drainer cannot know the liquid flow rate, discharge the liquid in a vertical state, and take samples without breaking the vacuum.

[0004] The second object of the present invention is to further provide a multifunctional negative pressure drainer that can be reliably placed on the ground, so as to solve the problem that the existing negative pressure drainer is easy to tip over when placed on the ground.

[0005] The above technical problems are solved by the following technical solutions: a multifunctional negative pressure drain, including a liquid storage tank, a drainage tube and a vacuum tube are provided on the top of the liquid storage tank, the vacuum tube is provided with a plug, the liquid storage tank is a transparent structure, the liquid storage tank is provided with a scale line showing the volume of the liquid in the liquid storage tank, a liquid discharge nozzle is provided at the bottom of the liquid storage tank, a liquid discharge valve is provided on the liquid discharge nozzle, and the liquid storage tank is also provided with a sampling structure. When in use, the liquid storage tank is evacuated through the vacuum tube to form a negative pressure, the drainage tube is placed at the part where drainage is required for drainage, the liquid flow rate is obtained by observing the scale value corresponding to the scale line aligned with the liquid surface in the liquid storage tank, the liquid in the liquid storage tank is discharged through the liquid discharge nozzle, the liquid storage tank needs to be vacuumed when draining, otherwise the liquid cannot be discharged, and the liquid in the liquid storage tank is taken out as a sample through the sampling structure.

[0006] Preferably, the sampling structure includes a vacuum generating tank and a capillary tube. The vacuum generating tank includes a flexible tube with a sealed structure having an open lower end and a rigid tank body with an open upper end. A liquid discharging structure is provided on the bottom wall of the rigid tank body. The capillary tube includes a vertical inner tube section located inside the liquid storage tank and a vertical outer tube section located outside the liquid storage tank. The upper ends of the inner tube section and the outer tube section are connected together by a connecting tube section. The connecting tube section is sealed and connected to the liquid storage tank. The outlet end of the outer tube section is provided with a one-way opening structure that opens towards the inside of the rigid tank body. The lower end of the outer tube section is connected to the upper side wall of the rigid tank body. The upper end of the flexible tube is sealed and connected to a rigid top wall, and the lower end of the flexible tube is sealed and connected to the upper end of the rigid tank body. When the flexible tube is turned over so that the rigid top wall is flat on the inner surface of the bottom wall of the rigid tank body, the flexible tube fills the rigid tank body, and the connecting tube section is above the liquid level in the liquid storage tank. Before the present invention is used, the flexible tube is turned over so that the rigid top wall is flat on the inner surface of the bottom wall of the rigid tank body and the liquid discharging structure is closed, so that the rigid tank is filled with the flexible tube. When sampling is required, the rigid top wall is pulled up, so that a vacuum with a lower vacuum degree than that in the liquid storage tank is generated in the rigid tank body and the one-way opening structure is opened, so that the liquid in the liquid storage tank is sucked into the rigid tank body through the capillary tube. Then, the sampling test tube is aligned with the liquid discharging structure and the liquid discharging structure is opened to make the liquid enter the sampling test tube. It is possible to take out the liquid as a sample without breaking the vacuum of the liquid storage tank.

[0007] Preferably, the lower end of the outer tube section is provided with a large-diameter section. A sealing step extending along the axial direction of the outer tube section is formed between the large-diameter section and the outer tube section. The one-way opening structure includes a support frame arranged inside the lower port of the outer tube section and a sealing diaphragm with an elastic structure centrally fixed on the support frame. The edge of the sealing diaphragm is hermetically lapped on the sealing step. A specific technical solution of the one-way opening structure is provided.

[0008] Preferably, the liquid discharging structure includes a stigma arranged on the outer surface of the bottom wall of the rigid tank body for inserting a sampling tube. A pit penetrating the inner surface of the bottom wall of the rigid tank body is arranged inside the upper end of the stigma. A liquid discharging hole penetrating the lower surface of the stigma is arranged in the pit. A necking section is arranged at the upper end of the pit. A floating ball that can be floated by air is arranged in the pit. When the floating ball floats, it seals and abuts against the lower end surface of the necking section. A pressing protrusion aligned with the necking section is arranged on the lower surface of the rigid top wall. When the flexible tube is turned over and the rigid top wall is placed flat on the inner surface of the bottom wall of the rigid tank body, the pressing protrusion can extend into the necking section. In the initial state, the floating ball is floated by air to close the necking section, and the flexible tube is in the state where the rigid top wall is placed flat on the inner surface of the bottom wall of the rigid tank body. When sampling is required, the rigid top wall is pulled upward, so that a vacuum with a lower vacuum degree than that in the wall storage tank is generated in the rigid tank body and the one-way opening structure is opened, so that the liquid in the storage tank is sucked into the rigid tank body through the capillary suction tube. Then, the sampling test tube is sleeved on the stigma, and the rigid top wall is moved towards the inside of the rigid tank body, so that the pressure in the rigid tank body increases. As a result, the one-way opening structure is closed and the floating ball is moved downward to be opened, so that the liquid in the rigid storage tank enters the sampling test tube. When the liquid in the rigid storage tube runs out, the pressing protrusion is sealed in the necking section to avoid insufficient vacuum degree caused by too much air in the rigid storage tank during secondary sampling.

[0009] Preferably, the inner surface of the bottom wall of the pit is a concave surface. A supporting sunken pit matched with the spherical surface of the floating ball is arranged on the inner surface of the bottom wall of the pit. There are at least two liquid discharging holes distributed along the circumferential direction of the supporting sunken pit. When the floating ball is supported in the supporting sunken pit, a liquid collecting groove is surrounded between the floating ball and the inner surface of the bottom wall of the pit. The inner port of the liquid discharging hole is located at the junction of the liquid collecting groove and the supporting sunken pit. It can ensure reliable liquid discharge.

[0010] Preferably, the peripheral surface of the necking section is a cylindrical surface. The pressing protrusion and the necking section are in a cylindrical surface fit. When the pressing protrusion penetrates into the necking section, it is hermetically connected with the necking section. An annular sealing step is formed between the pit and the necking section. A floating ball sealing surface for sealing with the floating ball is arranged on the annular sealing step. The floating ball sealing surface is connected with the wall surface of the necking section. When the pressing protrusion moves upward to seal the floating ball with the floating ball sealing surface, the volume of the space enclosed by the floating ball, the necking section and the pressing protrusion is less than one milliliter. It can further ensure the vacuum degree when the rigid storage tank forms a vacuum.

[0011] Preferably, the scale line is arranged on the inner surface of the storage tank. It can improve the accuracy when reading.

[0012] Preferably, it includes a storage support sleeve for the liquid storage tank. The storage support sleeve for the liquid storage tank includes a tube body and a partition plate located inside the tube body. The partition plate divides the tube body into a storage cylinder with an upward opening and a cylinder body with a downward opening. The storage cylinder is used to store the liquid storage tank. A piston is slidably and sealingly connected inside the cylinder body. The upper surface of the piston is connected to a piston driving mechanism. A rubber sealing lip extending along the circumferential direction of the tube body is provided on the lower end surface of the tube body. A drain nozzle avoidance channel penetrating the upper end surface of the storage cylinder is provided on the side wall of the storage cylinder. The drain nozzle is output to the outside of the storage cylinder through the drain nozzle avoidance channel, and the drain valve is located outside the storage cylinder. The method for fixing the present invention to the ground is as follows: Fix the storage support sleeve for the liquid storage tank to the ground while the liquid storage tank is overturned and moved; the way to fix the storage support sleeve for the liquid storage tank to the ground is: Move the piston to a position below the lower surface of the rubber sealing lip, press the tube body to the ground and seal it with the rubber sealing lip, and then move the piston upward to a set position through the piston driving mechanism and maintain it, so that a vacuum is generated inside the cylinder body and the storage support sleeve for the liquid storage tank is adsorbed on the ground; When removing the drainage ball storage support sleeve, break the vacuum by moving the piston downward. The second invention purpose is achieved.

[0013] Preferably, when the piston moves downward to the end of the stroke, the lower surface of the piston is located below the lower end surface of the rubber sealing lip. This can improve the effect of the drainage ball storage support sleeve being adsorbed on the ground.

[0014] Preferably, the piston driving mechanism includes a push-pull rod with its lower end connected to the piston and a push-pull disk connected to the upper end of the push-pull rod. The upper surface of the push-pull disk is a convex surface that cooperates with and supports the convex surface on the lower surface of the bottom wall of the liquid storage tank. The push-pull rod passes through the partition plate, and there is a clearance fit between the push-pull rod and the partition plate. A negative pressure maintaining structure for maintaining the piston at the set position when the piston moves upward to the set position is also provided on the wall of the cylinder body. During use, the piston is pushed and pulled to evacuate and break the vacuum by holding the push-pull disk. When the cylinder body is evacuated, the air holes gather in the through hole through which the push-pull rod passes, and the structural compactness is good.

[0015] Preferably, the negative pressure maintaining structure includes a horizontal supporting pin sealingly passing through the inner surface of the wall of the cylinder body and a spring for driving the horizontal supporting pin to move towards the inside of the cylinder body. A guiding inclined surface for guiding the supporting pin to contract towards the inside of the wall of the cylinder body is provided on the lower surface of the inner end of the horizontal supporting pin. The outer end of the horizontal supporting pin extends to the outside of the cylinder body. When the piston moves upward, the piston presses the guiding inclined surface, causing the horizontal supporting pin to contract and avoid, and the spring stores energy. When the piston passes over the horizontal supporting pin, it resets under the action of the spring and blocks below the piston, thus preventing the piston from moving downward and playing a role in maintaining the vacuum.

[0016] The present invention has the following advantages: it can know the amount of liquid in the liquid storage tank; it can prevent the liquid in the liquid storage tank from being taken out; sampling can be carried out without interrupting the liquid drainage; it can be reliably fixed on the ground without tipping over. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 FIG. is a schematic diagram of the present invention when the flexible tube is located inside the rigid tank; Figure 2 is Figure 1 a partial enlarged schematic diagram of part A of; Figure 3 is Figure 1 a partial enlarged schematic diagram of part B of; Figure 4 is Figure 1 a partial enlarged schematic diagram of part C of; Figure 5 FIG. is a schematic diagram when the sampling structure is sampling; Figure 6 is Figure 5 a partial enlarged schematic diagram of part D of; Figure 7 FIG. is a schematic diagram when the drainage ball storage support sleeve is fixed on the ground.

[0018] In the figures: liquid storage tank 1, liquid storage tank storage support sleeve 2, drainage tube 3, evacuation tube 4, plug 5, scale line 6, liquid discharge nozzle 7, liquid discharge valve 8, sampling structure 9, vacuum generation tank 10, capillary tube 11, flexible tube 12, rigid tank body 13, liquid discharge structure 14, inner pipe section 15, outer pipe section 16, connecting pipe section 17, one-way opening structure 18, rigid top wall 19, handle 20, large diameter section 21, sealing step 22, support bracket 23, sealing diaphragm 24, stud 25, pit 26, liquid discharge hole 27, necking section 28, floating ball 29, floating ball sealing surface 30, pressing protrusion 31, support sink 32, liquid collection tank 33, tube body 34, partition board 35, storage cylinder 36, cylinder body 37, piston 38, rubber sealing lip 39, liquid discharge nozzle avoidance channel 40, push-pull rod 41, push-pull disk 42, horizontal support pin 43, spring 44, guiding inclined surface 45, sampling test tube 46. DETAILED DESCRIPTION OF THE INVENTION

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0020] See Figures 1 to 7, a multi-functional negative pressure drainage device, comprising a liquid storage tank 1 and a liquid storage tank storage support sleeve 2. A drainage tube 3 and a vacuum extraction tube 4 are provided at the top of the liquid storage tank, and a plug 5 is provided on the vacuum extraction tube. The liquid storage tank is of a transparent structure. The liquid storage tank is provided with scale lines 6 for displaying the volume of the liquid in the liquid storage tank. The scale lines are arranged on the inner surface of the liquid storage tank. A liquid discharge nozzle 7 is provided at the bottom of the liquid storage tank. A liquid discharge valve 8 is provided on the liquid discharge nozzle. The liquid storage tank is further provided with a sampling structure 9. During use, vacuum is extracted into the liquid storage tank through the vacuum extraction tube to form negative pressure, the drainage tube is placed at the part that needs drainage for drainage, the liquid flow rate is obtained by observing the scale value corresponding to the scale line aligned with the liquid level in the liquid storage tank, and the liquid in the liquid storage tank is discharged through the liquid discharge nozzle.

[0021] The sampling structure includes a vacuum generating tank 10 and a capillary tube 11. The vacuum generating tank includes a flexible tube 12 with a sealed structure and an open lower end, and a rigid tank body 13 with an open upper end. A liquid discharging structure 14 is provided on the bottom wall of the rigid tank body. The capillary tube includes a vertical inner tube section 15 located inside the liquid storage tank and a vertical outer tube section 16 located outside the liquid storage tank. The upper ends of the inner tube section and the outer tube section are connected together by a connecting tube section 17. The connecting tube section is sealed and connected to the liquid storage tank. The outlet end of the outer tube section is provided with a one-way opening structure 18 opening towards the inside of the rigid tank body. The lower end of the outer tube section is connected to the upper side wall of the rigid tank body. The upper end of the flexible tube is sealed and connected with a rigid top wall 19. A handle 20 is provided on the outer surface of the rigid top wall. The lower end of the flexible tube is sealed and connected to the upper end of the rigid tank body. When the flexible tube is turned over and the rigid top wall is placed flat on the inner surface of the bottom wall of the rigid tank body, the flexible tube fills the rigid tank body, and the connecting tube section is located above the liquid level in the liquid storage tank. The lower end of the outer tube section is provided with a large-diameter section 21, and a sealing step 22 extending along the axial direction of the outer tube section is formed between the large-diameter section and the outer tube section. The one-way opening structure includes a supporting frame 23 arranged inside the lower port of the outer tube section and a sealing diaphragm 24 with an elastic structure centrally fixed on the supporting frame. The edge of the sealing diaphragm is hermetically lapped on the sealing step. The liquid discharging structure includes a stigma 25 provided on the outer surface of the bottom wall of the rigid tank body for inserting a sampling tube. A pit 26 penetrating the inner surface of the bottom wall of the rigid tank body is provided inside the upper end of the stigma. A liquid discharging hole 27 penetrating the lower surface of the stigma is provided in the pit. A converging section 28 is provided at the upper end of the pit. A floating ball 29 that can be floated by air is provided in the pit. An annular sealing step is formed between the pit and the converging section, and a floating ball sealing surface 30 that cooperates with the floating ball for sealing is provided on the annular sealing step. When the floating ball floats up, it seals against the floating ball sealing surface for sealing. A pressing protrusion 31 aligned with the converging section is provided on the lower surface of the rigid top wall. The spherical surface of the pressing protrusion is matched to contact the floating ball. When the flexible tube is turned over and the rigid top wall is placed flat and sealed on the inner surface of the bottom wall of the rigid tank body, the pressing protrusion can extend into the converging section. In the initial state, the floating ball is floated by air to close the converging section, and the flexible tube is in the state where the rigid top wall is placed flat on the inner surface of the bottom wall of the rigid tank body; when sampling is required, the rigid top wall is pulled up so that a vacuum lower than the vacuum in the liquid storage tank is generated in the rigid tank body and the one-way opening structure is opened, so that the liquid in the liquid storage tank is sucked into the rigid tank body through the capillary tube. Then, a sampling test tube is sleeved on the stigma, and the rigid top wall is moved towards the inside of the rigid tank body so that the pressure in the rigid tank body increases. As a result, the one-way opening structure is closed and the floating ball is moved downward to open, so that the liquid in the rigid storage tank enters the sampling test tube. When the liquid in the rigid storage tube runs out, the pressing protrusion is sealed in the converging section to prevent the air volume in the rigid storage tank from being too much during secondary sampling, resulting in insufficient vacuum.The inner surface of the bottom wall of the pit is a concave surface. A support sink 32 that mates with the spherical surface of the floating ball is provided on the inner surface of the bottom wall of the pit. There are at least two drain holes, which are distributed circumferentially along the support sink. When the floating ball is supported in the support sink, a liquid collection trough 33 is defined between the floating ball and the inner surface of the bottom wall of the pit. The inner port of the drain hole is located at the junction of the liquid collection trough and the support sink. The peripheral surface of the necking section is a cylindrical surface, and the surface between the pressing protrusion and the necking section is a cylindrical surface fit. When the pressing protrusion penetrates into the necking section, it is hermetically connected to the necking section, and the floating ball sealing surface is connected to the wall surface of the necking section. When the pressing protrusion moves upward until the floating ball is hermetically sealed with the floating ball sealing surface, the volume of the space enclosed by the floating ball, the necking section, and the pressing protrusion is less than one milliliter.

[0022] Before the present invention is used, the flexible tube is flipped so that the rigid top wall is placed flat on the inner surface of the bottom wall of the rigid tank body and the liquid discharge structure is closed, so that the rigid tank is filled with the flexible tube. When sampling is required, the rigid top wall is pulled upward, so that a lower vacuum than that in the wall storage tank is generated in the rigid tank body and the one-way opening structure is opened, so that the liquid in the storage tank is sucked into the rigid tank body through the capillary tube. Then, after aligning the sampling test tube with the liquid discharge structure, the liquid discharge structure is opened to allow the liquid to enter the sampling test tube 46. It is possible to take out the liquid as a sample without breaking the vacuum in the storage tank.

[0023] The storage tank storage support sleeve includes a tube body 34 and a partition plate 35 located inside the tube body. The partition plate separates the tube body into a storage cylinder 36 with an upward opening and a cylinder body 37 with a downward opening. The storage cylinder is used to store the storage cylinder in the storage tank. A piston 38 is slidably and hermetically connected inside the cylinder body, and the upper surface of the piston is connected to the piston driving mechanism. A rubber sealing lip 39 extending circumferentially along the tube body is provided on the lower end surface of the tube body. A drain nozzle avoidance channel 40 penetrating the upper end surface of the storage cylinder is provided on the side wall of the storage cylinder. The drain nozzle is output to the outside of the storage cylinder through the drain nozzle avoidance channel, and the drain valve is located outside the storage cylinder. The piston driving mechanism includes a push-pull rod 41 connected to the piston at the lower end and a push-pull disk 42 connected to the upper end of the push-pull rod. The upper surface of the push-pull disk is a convex surface that is convex upward and cooperates with the convex surface on the lower surface of the bottom wall of the storage tank for support. The push-pull rod penetrates through the partition plate, and there is a clearance fit between the push-pull rod and the partition plate. A negative pressure maintaining structure for maintaining the piston at the set position when the piston moves upward to the set position is further provided on the wall of the cylinder body. The negative pressure maintaining structure includes a horizontal supporting pin 43 hermetically penetrating the inner surface of the wall of the cylinder body and a spring 44 for driving the horizontal supporting pin to move toward the inside of the cylinder body. A guiding inclined surface 45 for guiding the supporting pin to contract toward the inside of the wall of the cylinder body is provided on the lower surface of the inner end of the horizontal supporting pin. The outer end of the horizontal supporting pin extends to the outside of the cylinder body.

[0024] The method for fixing the drainage ball storage support sleeve to the ground is as follows: Move the piston to a position where the lower surface is below the lower surface of the rubber sealing lip, press the tube body onto the ground and seal it with the rubber sealing lip, and then drive the piston upward to a set position and maintain it through the piston driving mechanism, so that a vacuum is generated inside the cylinder and the drainage ball storage support sleeve is adsorbed on the ground; When removing the drainage ball storage support sleeve, break the vacuum by moving the piston downward. When the piston moves downward to the end of the stroke, the lower surface of the piston is below the lower end surface of the rubber sealing lip.

[0025] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0026] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multifunctional negative pressure drainage device, comprising a liquid storage tank, a drainage tube and a vacuum tube are arranged on the top of the liquid storage tank, and the vacuum tube is provided with a plug, characterized in that: The liquid storage tank is a transparent structure, and is provided with scale lines showing the volume of the liquid in the liquid storage tank. A liquid discharge nozzle is provided at the bottom of the liquid storage tank, a liquid discharge valve is provided on the liquid discharge nozzle, and the liquid storage tank is also provided with a sampling structure.

2. A multifunctional negative pressure drainage device according to claim 1, characterized in that: The sampling structure includes a vacuum generating tank and a capillary pipette, the vacuum generating tank includes a flexible tube with a sealing structure opened at the lower end and a rigid tank body opened at the upper end, a liquid discharge structure is provided on the bottom wall of the rigid tank body, the capillary pipette includes a vertical inner tube section located in the liquid storage tank and a vertical outer tube section located outside the liquid storage tank, the upper end of the inner tube section and the upper end of the outer tube section are connected together by a connecting tube section, the connecting tube section is sealed and connected to the liquid storage tank, the outlet end of the outer tube section is provided with a one-way opening structure opened toward the rigid tank body, the lower end of the outer tube section is connected to the upper end side wall of the rigid tank body, the upper end of the flexible tube is sealed and connected to the rigid top wall, and the lower end of the flexible tube is sealed and connected to the upper end of the rigid tank body; when the flexible tube is flipped over to the rigid top wall being flat to the inner surface of the bottom wall of the rigid tank body, the flexible tube fills the rigid tank body, and the connecting tube section is located above the liquid level in the liquid storage tank.

3. A multifunctional negative pressure drainage device according to claim 2, characterized in that: A large diameter section is provided at the lower end of the outer tube section, and a sealing step extending axially along the outer tube section is formed between the large diameter section and the outer tube section. The one-way opening structure includes a supporting frame arranged in the lower port of the outer tube section and a sealing diaphragm with an elastic structure centrally fixed on the supporting frame, and the edge of the sealing diaphragm is sealed and overlapped on the sealing step.

4. A multifunctional negative pressure drainage device according to claim 2 or 3, characterized in that: The drainage structure includes a column head for inserting a sampling tube, which is arranged on the outer surface of the bottom wall of the rigid tank body. The upper end of the column head is provided with a pit that passes through the inner surface of the bottom wall of the rigid tank body. The pit is provided with a drainage hole that passes through the lower surface of the column head. The upper end of the pit is provided with a closing section. A floating ball that can be floated by air is provided in the pit. When the floating ball floats, it seals and abuts against the lower end surface of the closing section. The lower surface of the rigid top wall is provided with a pressing protrusion aligned with the closing section. When the flexible tube is flipped over until the rigid top wall is flat against the inner surface of the bottom wall of the rigid tank body, the pressing protrusion can extend into the closing section.

5. A multifunctional negative pressure drainage device according to claim 4, characterized in that: The inner surface of the bottom wall of the pit is concave, and the inner surface of the bottom wall of the pit is provided with a supporting pit that cooperates with the spherical surface of the float. There are at least two drainage holes and they are distributed along the circumference of the supporting pit. When the float is supported in the supporting pit, a liquid collecting groove is enclosed between the float and the inner surface of the bottom wall of the pit, and the inner port of the drainage hole is located at the junction of the liquid collecting groove and the supporting pit.

6. A multifunctional negative pressure drainage device according to claim 4, characterized in that: The peripheral surface of the closing section is a cylinder, and the pressing protrusion and the closing section are cylindrically matched. When the pressing protrusion is inserted into the closing section, it is sealed and connected with the closing section. An annular sealing step is formed between the pit and the closing section. A float sealing surface is provided on the annular sealing step for sealing with a float. The float sealing surface is connected to the wall surface of the closing section. When the pressing protrusion moves up to the float and is sealed with the float sealing surface, the volume of the space enclosed by the float, the closing section and the pressing protrusion is less than one milliliter.

7. A multifunctional negative pressure drainage device according to claim 1, 2 or 3, characterized in that: It includes a liquid storage tank storage sleeve, which includes a tube body and a separation plate located in the tube body, the separation plate separates the tube body into a storage barrel with an upward opening and a cylinder body with a downward opening, the storage barrel is used to store the liquid storage tank, a piston is slidingly and sealingly connected in the cylinder body, the upper surface of the piston is connected to the piston driving mechanism, a rubber sealing lip extending along the circumference of the tube body is provided on the lower end surface of the tube body, a liquid discharge nozzle avoidance channel penetrating the upper end surface of the storage barrel is provided on the side wall of the storage barrel, the liquid discharge nozzle is output to the outside of the storage barrel through the liquid discharge nozzle avoidance channel, and the liquid discharge valve is located outside the storage barrel.

8. The multifunctional negative pressure drainage device according to claim 7, characterized in that: The piston driving mechanism includes a push-pull rod whose lower end is connected to the piston and a push-pull plate connected to the upper end of the push-pull rod. The upper surface of the push-pull plate is an upwardly protruding surface that cooperates with the convex surface supported on the lower surface of the bottom wall of the liquid storage tank. The push-pull rod is inserted into the isolation plate, and there is a clearance fit between the push-pull rod and the isolation plate. The wall of the cylinder body is also provided with a negative pressure maintaining structure that maintains the piston at the set position when the piston moves upward to the set position.

9. The multifunctional negative pressure drainage device according to claim 8, characterized in that: The negative pressure maintaining structure includes a horizontal supporting pin that is sealed and penetrated on the inner surface of the wall of the cylinder body and a spring that drives the horizontal supporting pin to move toward the cylinder body. A downwardly inclined guide slope is provided on the lower surface of the inner end of the horizontal supporting pin to guide the supporting pin to retract toward the wall of the cylinder body. The outer end of the horizontal supporting pin extends to the outside of the cylinder body.

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