Multifunctional negative pressure drainage device

Abstract

The present application relates to a kind of multifunctional negative pressure drainage device, including liquid storage tank, the top of the liquid storage tank is equipped with drainage pipe and vacuum pipe, the vacuum pipe is equipped with plug, the liquid storage tank is transparent structure, the liquid storage tank is equipped with the scale line showing the volume of liquid in liquid storage tank, the bottom of the liquid storage tank is equipped with drain nozzle, the drain nozzle is equipped with drain valve, the liquid storage tank is also equipped with sampling structure.The present application aims to provide a kind of multifunctional negative pressure drainage device, solves the problem that negative pressure drainage device cannot know liquid flow, vertically arranged state discharges liquid and does not break vacuum sampling.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical supplies, in particular to a multifunctional negative pressure drainage device. BACKGROUND

[0002] The negative pressure drainage device is a medical device widely used in the medical field, mainly used for drainage after surgery or trauma, to help patients to remove blood, body fluid, pus and other secretions in the body, so as to reduce the risk of infection and promote wound healing. The negative pressure drainage device includes a liquid storage tank, the top of the liquid storage tank is provided with a drainage pipe and a vacuum pipe, and the vacuum pipe is provided with a plug. The existing negative pressure drainage device has the following disadvantages: only the inverted mode can be used to pour out the liquid in the liquid storage tank; the amount of liquid in the liquid storage tank cannot be known; sampling needs to break the vacuum, which causes the interruption of drainage; due to the light weight of the liquid storage tank, it is easy to be tilted when placed on the ground. SUMMARY

[0003] The present application aims to provide a multifunctional negative pressure drainage device, which solves the problems that the negative pressure drainage device cannot know the liquid flow, discharge liquid in the vertical state and sampling without breaking the vacuum.

[0004] The second object of the present application aims to further provide a multifunctional negative pressure drainage device that can be reliably placed on the ground, which solves the problem that the existing negative pressure drainage device is easy to be tilted when placed on the ground.

[0005] The above technical problems are solved by the following technical scheme: a multifunctional negative pressure drainage device, comprising a liquid storage tank, the top of the liquid storage tank is provided with a drainage pipe and a vacuum pipe, the vacuum pipe is provided with a plug, the liquid storage tank is a transparent structure, the liquid storage tank is provided with a scale line for displaying the volume of the liquid in the liquid storage tank, the bottom of the liquid storage tank is provided with a liquid discharge nozzle, the liquid discharge nozzle is provided with a liquid discharge valve, and the liquid storage tank is further provided with a sampling structure. In use, the liquid storage tank is vacuumed through the vacuum pipe to form negative pressure, the drainage pipe is placed at the part to be drained for drainage, the liquid flow is obtained by observing the scale value corresponding to the scale line of the liquid level 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 broken to vacuum when discharging the liquid, and the liquid in the liquid storage tank is taken out as a sample through the sampling structure.

[0006] As preferred, the sampling structure comprises a vacuum generating tank and a capillary pipette, the vacuum generating tank comprises a flexible tube with a lower end opening of a sealed structure and a rigid tank body with an upper end opening, a liquid discharging structure is arranged on the bottom wall of the rigid tank body, the capillary pipette comprises 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 through a connecting tube section, the connecting tube section is sealedly connected with the liquid storage tank, the outlet end of the outer tube section is provided with a one-way opening structure opening towards the inside of the rigid tank body, the lower end of the outer tube section is connected with the upper end side wall of the rigid tank body, the upper end of the flexible tube is sealedly connected with a rigid top wall, and the lower end of the flexible tube is sealedly connected with the upper end of the rigid tank body; when the flexible tube is turned over to the rigid top wall being placed 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. Before use, the flexible tube is turned over to the rigid top wall being placed 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 needed, the rigid top wall is pulled up, so that a vacuum with a lower vacuum degree 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 pipette, then the sampling test tube is aligned with the liquid discharging structure, the liquid discharging structure is opened, and the liquid is discharged into the sampling test tube. The liquid can be taken out as a sample without breaking the vacuum of the liquid storage tank.

[0007] As preferred, 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 comprises a supporting frame arranged in the lower end port of the outer tube section and a sealing diaphragm of an elastic structure fixed at the center of the supporting frame, and the edge of the sealing diaphragm is sealingly overlapped on the sealing step. A specific technical solution of the one-way opening structure is provided.

[0008] As preferred, the liquid discharging structure comprises a column head provided on the outer surface of the bottom wall of the rigid tank for inserting the sampling tube, an upper end of the column head is provided with a recess penetrating the inner surface of the bottom wall of the rigid tank, the recess is provided with a liquid discharging hole penetrating the lower surface of the column head, an upper end of the recess is provided with a closed end section, the recess is provided with an air floatable float ball, the float ball is sealed against the lower end surface of the closed end section when floating, the lower surface of the rigid top wall is provided with a pressing protrusion aligned with the closed end section, the pressing protrusion can extend into the closed end section when the flexible tube is turned over to the rigid top wall and placed on the inner surface of the bottom wall of the rigid tank. In the initial state, the float ball is floated by air to close the closed end section, and the flexible tube is in the state that the rigid top wall is placed on the inner surface of the bottom wall of the rigid tank; when sampling is needed, the rigid top wall is pulled up to generate a vacuum in the rigid tank with lower vacuum degree than the vacuum in the liquid storage tank and open the one-way opening structure, so that the liquid in the liquid storage tank is sucked into the rigid tank through the capillary tube, then the sampling tube is sleeved on the column head, the rigid top wall is moved towards the rigid tank to increase the pressure in the rigid tank, as a result, the one-way opening structure is closed and the float ball is moved downward to open, so that the liquid in the rigid storage tank enters the sampling tube, and when the liquid in the rigid storage tank flows, the pressing protrusion is sealed in the closed end section, avoiding that the air in the rigid storage tank is too much to cause insufficient vacuum degree when secondary sampling is performed.

[0009] As preferred, the inner surface of the bottom wall of the recess is concave, the inner surface of the bottom wall of the recess is provided with a support pit matched with the surface of the float ball, the liquid collecting groove is surrounded between the float ball and the inner surface of the bottom wall of the recess when the float ball is supported in the support pit, and the inner end of the liquid discharging hole is located at the junction of the liquid collecting groove and the support pit. The liquid can be reliably discharged.

[0010] As preferred, the peripheral surface of the closed end section is a cylindrical surface, the pressing protrusion and the closed end section are matched with each other in a cylindrical surface, the pressing protrusion is connected with the closed end section in a sealed manner when penetrating the closed end section, an annular sealing step is formed between the recess and the closed end section, the annular sealing step is provided with a float ball sealing surface matched with the float ball for sealing, the float ball sealing surface is connected with the wall surface of the closed end section, and the volume of the space surrounded by the float ball, the closed end section and the pressing protrusion is below one milliliter when the float ball is sealed with the float ball sealing surface. The vacuum degree of the rigid storage tank when forming a vacuum can be further ensured.

[0011] As preferred, the scale is provided on the inner surface of the liquid storage tank. The accuracy when reading can be improved.

[0012] As preferred, the liquid tank storage holder comprises a tube body and a partition plate in the tube body, the partition plate separates the tube body into an upward opening cartridge for storing the liquid tank and a downward opening cylinder, a piston is slidingly connected in the cylinder, the upper surface of the piston is connected with a piston driving mechanism, the lower end surface of the tube body is provided with a rubber sealing lip extending along the circumference of the tube body, the side wall of the cartridge is provided with a liquid outlet nozzle avoiding channel penetrating through the upper end surface of the cartridge, the liquid outlet nozzle outputs to the outside of the cartridge through the liquid outlet nozzle avoiding channel, and the liquid outlet valve is located outside the cartridge. The method for fixing the liquid tank storage holder on the ground is to fix the liquid tank storage holder on the ground and move the liquid tank upside down, the way for fixing the liquid tank storage holder on the ground is to move the piston to below the lower surface of the rubber sealing lip, press the tube body to the ground and seal it with the rubber sealing lip, then move the piston to a set position by the piston driving mechanism and maintain it, so that a vacuum is generated in the cylinder to adsorb the liquid tank storage holder on the ground, and the vacuum is broken by moving the piston downward when the flow guide ball storage holder is removed. The second object is achieved.

[0013] As preferred, the lower surface of the piston is below the lower end surface of the rubber sealing lip when the piston moves downward to the end of stroke. The effect of adsorbing the flow guide ball storage holder on the ground can be improved.

[0014] As preferred, the piston driving mechanism comprises a push-pull rod connected with the piston at the lower end and a push-pull disc connected with the push-pull rod at the upper end, the upper surface of the push-pull disc is a convex surface matched and held on the convex surface on the lower surface of the bottom wall of the liquid tank, the push-pull rod penetrates through the partition plate, the push-pull rod and the partition plate are gap matched, and the wall of the cylinder is further provided with a negative pressure maintaining structure for maintaining the piston at the set position when the piston moves upward to the set position. In use, the piston is pushed and pulled by holding the push-pull disc to perform vacuumizing and vacuum breaking. The air holes are gathered in the through hole through which the push-pull rod passes when the cylinder is vacuumized, and the structure is compact.

[0015] As preferred, the negative pressure maintaining structure comprises a horizontal holding pin penetrating through the inner surface of the wall of the cylinder and a spring driving the horizontal holding pin to move toward the inside of the cylinder, the lower surface of the inner end of the horizontal holding pin is provided with a downward inclined guide inclined surface guiding the horizontal holding pin to retract toward the wall of the cylinder, and the outer end of the horizontal holding pin extends to the outside of the cylinder. When the piston is moved upward, the piston extrudes the guide inclined surface to make the horizontal holding pin retract and store energy of the spring, and the piston is reset to block below the piston under the action of the spring when the piston passes the horizontal holding pin, so as to avoid the piston moving downward and maintain the vacuum.

[0016] The present application has the following points: the liquid amount in the liquid storage tank can be known; the liquid in the liquid storage tank can be taken out without causing; sampling can be carried out without interrupting the drainage; and the present application can be reliably fixed on the ground without causing overturning. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The schematic diagram of the present application when the flexible pipe is located in the rigid tank body;

[0018] Figure 2 The partial enlarged schematic diagram of A of Figure 1

[0019] Figure 3 The partial enlarged schematic diagram of B of Figure 1

[0020] Figure 4 The partial enlarged schematic diagram of C of Figure 1

[0021] Figure 5 The schematic diagram when the sampling structure carries out sampling;

[0022] Figure 6 The partial enlarged schematic diagram of D of Figure 5

[0023] Figure 7 The schematic diagram when the drainage ball storage sleeve is fixed on the ground.

[0024] In the drawing: liquid storage tank 1, liquid storage tank storage sleeve 2, drainage pipe 3, vacuum pipe 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 pipe 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, holding frame 23, sealing diaphragm 24, stud 25, dimple 26, liquid discharge hole 27, closed end section 28, floating ball 29, floating ball sealing surface 30, pressing protrusion 31, support pit 32, liquid collection groove 33, pipe body 34, isolation plate 35, storage cylinder 36, cylinder body 37, piston 38, rubber sealing lip 39, liquid discharge nozzle avoiding passage 40, push-pull rod 41, push-pull disc 42, horizontal holding pin 43, spring 44, guide inclined surface 45, sampling test tube 46. DETAILED DESCRIPTION

[0025] ​​​​Clearly, the described embodiments are only a part of the embodiments of the present application, and part of all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative labor are within the protection scope of the present application.

[0026] Referring to Figures 1 to 7 A multifunctional negative pressure drainage device comprises a liquid storage tank 1 and a liquid storage tank storage sleeve 2. The top of the liquid storage tank is provided with a drainage tube 3 and a vacuum tube 4, and the vacuum tube is provided with a plug 5. The liquid storage tank is of a transparent structure. The liquid storage tank is provided with a scale line 6 for displaying the volume of liquid in the liquid storage tank. The scale line is arranged on the inner surface of the liquid storage tank. The bottom of the liquid storage tank is provided with a liquid discharge nozzle 7. The liquid discharge nozzle is provided with a liquid discharge valve 8. The liquid storage tank is further provided with a sampling structure 9. In use, the liquid storage tank is vacuumized through the vacuum tube to form a negative pressure, the drainage tube is placed at a position requiring drainage to perform drainage, the liquid flow 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.

[0027] The sampling structure comprises a vacuum generating tank 10 and a capillary pipette 11. The vacuum generating tank comprises a flexible tube 12 with a lower end opening and a sealed structure, and a rigid tank body 13 with an upper end opening. A bottom wall of the rigid tank body is provided with a liquid discharging structure 14. The capillary pipette comprises a vertical inner tube segment 15 located in the liquid storage tank and a vertical outer tube segment 16 located outside the liquid storage tank. The upper end of the inner tube segment and the upper end of the outer tube segment are connected together through a connecting tube segment 17. The connecting tube segment is sealedly connected with the liquid storage tank. An outlet end of the outer tube segment is provided with a one-way opening structure 18 opening towards the inside of the rigid tank body. A lower end of the outer tube segment is connected with a side wall of the upper end of the rigid tank body. An upper end of the flexible tube is sealedly connected with a rigid top wall 19. An outer surface of the rigid top wall is provided with a handle 20. A lower end of the flexible tube is sealedly connected with the upper end of the rigid tank body. When the flexible tube is turned over and the rigid top wall is placed 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 segment is located above the liquid level in the liquid storage tank. The lower end of the outer tube segment is provided with a large diameter segment 21. A sealing step 22 extending along the axial direction of the outer tube segment is formed between the large diameter segment and the outer tube segment. The one-way opening structure comprises a supporting frame 23 arranged in the lower end port of the outer tube segment and a sealing diaphragm 24 of elastic structure fixed at the center of the supporting frame. The edge of the sealing diaphragm is sealedly overlapped on the sealing step. The liquid discharging structure comprises a post head 25 arranged on the outer surface of the bottom wall of the rigid tank body for inserting the sampling tube. An upper end of the post head is provided with a recess 26 penetrating the inner surface of the bottom wall of the rigid tank body. The recess is provided with a liquid discharging hole 27 penetrating the lower surface of the post head. An upper end of the recess is provided with a closing segment 28. The recess is provided with a float ball 29 capable of being floated by air. An annular sealing step is formed between the recess and the closing segment. The annular sealing step is provided with a float ball sealing surface 30 cooperating with the float ball to seal. The float ball is sealedly abutted on the float ball sealing surface when the float ball is floated. A lower surface of the rigid top wall is provided with a pressing protrusion 31 aligned with the closing segment. A spherical surface of the pressing protrusion is in contact with the float ball. When the flexible tube is turned over and the rigid top wall is placed on the inner surface of the bottom wall of the rigid tank body, the pressing protrusion can extend into the closing segment. In the initial state, the float ball is floated by the air to close the closing segment, and the flexible tube is in the state that the rigid top wall is placed on the inner surface of the bottom wall of the rigid tank body. When sampling is needed, the rigid top wall is pulled up to generate a vacuum in the rigid tank body with a lower vacuum degree than that in the liquid storage tank and to open the one-way opening structure, so that the liquid in the liquid storage tank is sucked into the rigid tank body through the capillary pipette. Then, the sampling test tube is sleeved on the post head, and the rigid top wall is moved towards the rigid tank to increase the pressure in the rigid tank body. As a result, the one-way opening structure is closed, and the float ball is moved downwards to be opened, so that the liquid in the rigid storage tank enters the sampling test tube. When the liquid in the rigid storage tank flows, the pressing protrusion is sealed in the closing segment, thereby avoiding that the air amount in the rigid storage tank is too large to cause insufficient vacuum degree in the secondary sampling.The inner surface of the bottom wall of the pit is concave, the inner surface of the bottom wall of the pit is provided with a support pit 32 matched with the spherical surface of the floating ball, the liquid discharge hole is at least two and is distributed along the circumference of the support pit, the floating ball is supported in the support pit, and the liquid collection groove 33 is surrounded between the floating ball and the inner surface of the bottom wall of the pit when the floating ball is supported in the support pit, and the inner port of the liquid discharge hole is located at the junction of the liquid collection groove and the support pit. The peripheral surface of the closing section is a cylindrical surface, and the pressing protrusion and the closing section are matched with the cylindrical surface. The pressing protrusion is sealingly connected with the closing section when the pressing protrusion is arranged in the closing section, and the floating ball sealing surface is connected with the wall surface of the closing section. When the pressing protrusion is moved up to the floating ball and the floating ball sealing surface are sealingly connected together, the volume of the space surrounded by the floating ball, the closing section and the pressing protrusion is less than one milliliter.

[0028] Before use, the flexible tube is turned over to the rigid top wall flat to the inner surface of the bottom wall of the rigid tank, and the liquid discharge structure is closed, so that the rigid tank is filled with the flexible tube. When sampling is needed, the rigid top wall is pulled up to generate a vacuum in the wall liquid storage tank in the rigid tank body with lower vacuum degree 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 pipette, and then the liquid discharge structure is opened after the sampling test tube is aligned with the liquid discharge structure to make the liquid enter the sampling test tube 46. The liquid can be taken out as a sample without breaking the vacuum of the liquid storage tank.

[0029] The liquid storage tank storage holder includes a tube body 34 and a separation plate 35 arranged in the tube body, the separation plate separates the tube body into an opening-upward storage cylinder 36 and an opening-downward cylinder body 37, the storage cylinder is used to store the storage cylinder in the liquid storage tank, the cylinder body is slidingly and sealingly connected with a piston 38, and the upper surface of the piston is connected with a piston driving mechanism. A rubber sealing lip 39 extending along the circumference of the tube body is arranged on the lower end surface of the tube body, a liquid discharge nozzle avoiding channel 40 penetrating through the upper end surface of the storage cylinder is arranged on the side wall of the storage cylinder, the liquid discharge nozzle is output to the outside of the storage cylinder through the liquid discharge nozzle avoiding channel, and a liquid discharge valve is arranged on the outside of the storage cylinder. The piston driving mechanism includes a push-pull rod 41 connected with the piston at the lower end and a push-pull disc 42 connected with the upper end of the push-pull rod, the upper surface of the push-pull disc is a convex surface matched with the convex surface on the lower surface of the bottom wall of the liquid storage tank, the push-pull rod is arranged in the separation plate, and the push-pull rod is gap-fitted with the separation plate. The wall of the cylinder body is further provided with a negative pressure maintaining structure for maintaining the piston at a set position when the piston moves upward to the set position. The negative pressure maintaining structure includes a horizontal holding pin 43 sealingly arranged on the inner surface of the wall of the cylinder body and a spring 44 driving the horizontal holding pin to move toward the inside of the cylinder body, the lower surface of the inner end of the horizontal holding pin is provided with a downward inclined guide inclined surface 45 guiding the horizontal holding pin to shrink toward the wall of the cylinder body, and the outer end of the horizontal holding pin protrudes to the outside of the cylinder body.

[0030] The method for fixing the drainage ball storage holder to the ground is as follows: the piston is moved to below the lower surface of the rubber sealing lip, the tube body is pressed to the ground and sealed by the rubber sealing lip, then the piston is moved up to a set position by the piston driving mechanism and maintained, so that a vacuum is generated inside the cylinder body and the drainage ball storage holder is adsorbed to the ground; the vacuum is broken by moving the piston down when the drainage ball storage holder is removed. When the piston moves down to the end of the stroke, the lower surface of the piston is below the lower end surface of the rubber sealing lip.

[0031] It should be noted that the relational terms herein such as first and second and the like are used solely to distinguish one from another entity or action without necessarily requiring or implying any actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0032] While embodiments of the application have been shown and described, it is to be understood that the application is not limited to the details of the embodiments described, since numerous changes, modifications, substitutions and alterations can be made thereto without departing from the spirit and scope of the application as defined by the appended claims and their equivalents.

Claims

1. A multifunctional negative pressure drainage device, comprising a liquid storage tank, wherein the top of the liquid storage tank is provided with a drainage tube and a vacuum tube, and the vacuum tube is provided with a plug, characterized in that, The storage tank is transparent and has graduations indicating the volume of the liquid inside. A drain nozzle with a drain valve is located at the bottom of the tank. The tank also includes a sampling structure comprising a vacuum generating vessel and a capillary tube. The vacuum generating vessel consists of a flexible tube with a sealed lower end and a rigid tank body with an open upper end. A drain structure is located on the bottom wall of the rigid tank body. The capillary tube includes a vertical inner tube section inside the storage tank and a vertical outer tube section outside the tank. The upper end of the inner tube section... The upper end of the outer pipe section is connected to the upper end of the outer pipe section via a connecting pipe section, which is sealed to the liquid storage tank. The outlet end of the outer pipe section is provided with a one-way opening structure that opens into the rigid tank. The lower end of the outer pipe section is connected to the upper side wall of the rigid tank. The upper end of the flexible pipe is sealed to a rigid top wall, and the lower end of the flexible pipe is sealed to the upper end of the rigid tank. When the flexible pipe is flipped over and placed flat against the inner surface of the bottom wall of the rigid tank, the flexible pipe fills the rigid tank, and the connecting pipe section is located above the liquid level in the liquid storage tank.

2. The multifunctional negative pressure drainage device according to claim 1, characterized in that, The lower end of the outer pipe section is provided with a large-diameter section, and a sealing step extending axially along the outer pipe section is formed between the large-diameter section and the outer pipe section. The one-way opening structure includes a support frame disposed in the lower port of the outer pipe section and a sealing diaphragm of an elastic structure fixed in the center on the support frame. The edge of the sealing diaphragm is sealed and overlapped on the sealing step.

3. A multifunctional negative pressure drainage device according to claim 1 or 2, characterized in that, The drainage structure includes a column head for inserting a sampling tube, disposed on the outer surface of the bottom wall of a rigid tank. The upper end of the column head has a recess that penetrates the inner surface of the bottom wall of the rigid tank. The recess has a drainage hole that penetrates the lower surface of the column head. The upper end of the recess has a constriction section. A float that can be floated by air is disposed in the recess. When the float floats, it seals against the lower end face of the constriction section. The lower surface of the rigid top wall has a pressing protrusion aligned with the constriction section. When the flexible tube is flipped so that the rigid top wall is flat against the inner surface of the bottom wall of the rigid tank, the pressing protrusion can extend into the constriction section.

4. A multifunctional negative pressure drainage device according to claim 3, characterized in that, The inner surface of the bottom wall of the recess is concave, and the inner surface of the bottom wall of the recess is provided with a supporting sink that matches the spherical surface of the float. There are at least two drainage holes distributed along the circumference of the supporting recess. When the float is supported in the supporting sink, a liquid collection channel is formed between the float and the inner surface of the bottom wall of the recess. The inner port of the drainage hole is located at the junction of the liquid collection channel and the supporting sink.

5. A multifunctional negative pressure drainage device according to claim 3, characterized in that, The peripheral surface of the constriction section is cylindrical, and the pressing protrusion and the constriction section are in cylindrical contact. When the pressing protrusion passes through the constriction section, it is sealed together with the constriction section. An annular sealing step is formed between the recess and the constriction section. The annular sealing step is provided with a float sealing surface that cooperates with the float for sealing. The float sealing surface is connected to the wall of the constriction section. When the pressing protrusion moves up to seal the float with the float sealing surface, the volume of the space enclosed by the float, the constriction section and the pressing protrusion is less than one milliliter.

6. A multifunctional negative pressure drainage device according to claim 1 or 2, characterized in that, The system includes a storage tank support, which comprises a tube and a partition plate located inside the tube. The partition plate separates the tube into an upward-opening storage cylinder and a downward-opening cylinder. The storage cylinder is used to store the liquid. A piston is slidably and sealed inside the cylinder. The upper surface of the piston is connected to a piston drive mechanism. A rubber sealing lip extending circumferentially along the lower end face of the tube is provided. A drain nozzle clearance channel penetrating the upper end face of the storage cylinder is provided on the side wall of the storage cylinder. The drain nozzle outputs to the outside of the storage cylinder through the drain nozzle clearance channel. The drain valve is located outside the storage cylinder.

7. A multifunctional negative pressure drainage device according to claim 6, characterized in that, The piston drive mechanism includes a push-pull rod connected to the piston at its lower end 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 convex surface that fits against the convex surface of the lower surface of the bottom wall of the liquid storage tank. The push-pull rod passes through the isolation plate, and there is a clearance fit between the push-pull rod and the isolation plate. The cylinder wall is also provided with a negative pressure maintaining structure that keeps the piston in the set position when the piston moves upward.

8. A multifunctional negative pressure drainage device according to claim 7, characterized in that, The negative pressure maintaining structure includes a horizontal support pin that is sealed and passes through the inner surface of the cylinder wall and a spring that drives the horizontal support pin to move toward the inside of the cylinder. The lower surface of the inner end of the horizontal support pin is provided with a downwardly inclined guide slope that guides the support pin to retract toward the inside of the cylinder wall. The outer end of the horizontal support pin extends to the outside of the cylinder.

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