A precision drainage fluid measuring bag

Abstract

The present invention discloses a precision drainage liquid measuring bag, which relates to the technical field of medical devices. The precision drainage liquid measuring bag comprises: a support plate and a base fixed on the support plate, a precision measuring box is provided above the base, and a liquid storage bag is provided below the base, the surface of the precision measuring box is provided with precision scale lines, the surface of the liquid storage bag is provided with measuring scale lines, and the liquid storage bag is used to receive a quantitative amount of liquid from the precision measuring box. Through the siphon effect of the n-shaped tube, the liquid inside the precision measuring box is sucked into the liquid storage bag. Under the setting of the interception component, the connecting pipe can be blocked during the drainage process of the precision measuring box, thereby avoiding the phenomenon that the precision measuring box is draining liquid while taking in liquid, and improving the accuracy of the measurement result; the air pressure inside the precision measuring box and the liquid storage bag can be stabilized through the balance tube and the balance hole, thereby ensuring the stability of the n-shaped tube siphon triggering, and further improving the accuracy of the measurement result.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, in particular to a precision drainage fluid measuring bag. Background Art

[0002] Drainage bags generally refer to the bleeding and effusion inside the body or deep in local surgery after surgery, which need to be led out with a pipe. The end of the drainage tube is connected to a transparent plastic bag that is specially used to hold the drained liquid. However, the current liquid storage bag body is a soft film bag body, and the measurement error is large. It is easy to misread the volume when using the scale to measure the volume. The bag will deform when the drainage volume is large. Therefore, precision liquid collection bags have appeared on the market. The existing precision liquid collection bags are usually composed of a measuring bottle and a liquid collection bag connected. The principle is that the liquid is measured by the measuring bottle and then collected by the liquid collection bag. When in use, the liquid first flows into the measuring bottle, and after it is full, it is manually poured into the liquid collection bag. However, this structure has certain defects when in use. First, it is necessary to manually monitor whether the measuring bottle is full during use, and medical staff must manually discharge the liquid from the measuring bottle to the liquid collection bag. Therefore, a precision metering drainage bag was announced in Chinese Patent Publication No. CN1 12386750A. The device does not require manual monitoring and liquid discharge, which reduces the manual burden.

[0003] However, the above structure still has defects during use. First, when the liquid inside the precision metering box is output to the liquid storage bag, the drainage tube is in a circulation state, which will cause the liquid inside the precision metering box to be discharged and input at the same time, resulting in inaccurate measurement by the precision metering box. Secondly, in the traditional structure, the air pressure inside the metering bottle and the liquid collecting bag is unstable when in use. If the air pressure inside the metering bottle is greater than that in the liquid collecting bag, the siphon will be triggered in advance. If the air pressure inside the metering bottle is less than that in the liquid collecting bag, the siphon phenomenon will be delayed. Both situations will cause inaccurate measurement and amplify the measurement error. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a precision drainage fluid measuring bag, which solves the problems raised in the above-mentioned background technology.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a precision drainage fluid measuring bag, comprising: a support plate and a base fixed on the support plate, a precision measuring box is provided above the base, and a liquid storage bag is provided below the base, the surface of the precision measuring box is provided with precision graduation lines, the surface of the liquid storage bag is provided with measuring graduation lines, and the liquid storage bag is used to receive a certain amount of liquid from the precision measuring box; and an n-shaped tube, the n-shaped tube comprises a C-shaped tube, a long tube provided at one end of the C-shaped tube and a short tube at the other end of the C-shaped tube, The lower end of the short tube is located near the bottom of the precision metering box, and the lower end of the long tube is located at the top of the liquid storage bag; and a balance tube, the balance tube is arranged on the base, the upper end of the balance tube is higher than the C-shaped tube, and the lower end of the balance tube is flush with the top of the liquid storage bag, so that the air pressure inside the liquid storage bag and the precision metering box are the same, and the upper end of the balance tube is symmetrically provided with balance holes; and a cut-off component, a connecting pipe is provided at the upper end of the precision metering box, the cut-off component is arranged on the connecting pipe, and the cut-off component blocks the connecting pipe during the discharge process of the n-shaped tube.

[0006] Furthermore, the intercepting assembly includes a cylindrical shell vertically mounted on the connecting tube, through holes are symmetrically provided at the connection between the cylindrical shell and the connecting tube, and an axially slidable piston is provided inside the cylindrical shell, and a return spring is installed between the upper end of the piston and the top end of the cylindrical shell; the precision drainage liquid measuring bag also includes a linkage assembly, which can pull the piston down when impacted by the liquid inside the long tube to seal the through hole.

[0007] Furthermore, the linkage assembly includes a force plate slidably mounted on the upper end of the liquid storage bag, and the force plate is located at the lower end of the long tube. A nylon string is fixed to the force plate, and the nylon string passes through a balance tube and is fixedly connected to the piston.

[0008] Furthermore, a notch groove is provided at one end of the force-bearing plate, and a slide rail slidably connected to the notch groove is provided on the inner wall of the liquid storage bag.

[0009] Furthermore, an active output tube is provided inside the base, the upper end of the active output tube is flush with the bottom of the precision metering box, and the lower end of the active output tube extends into the liquid storage bag. A manual valve for controlling opening and closing is installed in the middle of the active output tube, and the manual valve is exposed to the outside of the base.

[0010] Furthermore, the lower end of the active output pipe passes through the force-bearing plate and is installed with a limiting ring, and the limiting ring is used to limit the force-bearing plate from separating from the active output pipe.

[0011] Furthermore, a wedge-shaped block is provided at a position of the bottom of the precision metering box relative to the active output tube, and a partition is also provided in the precision metering box.

[0012] Furthermore, the connecting tube is a hard tube, and one end of the connecting tube extends outside the precision metering box and is provided with a drainage tube; a handle is provided near the upper end of the support plate, and a fixing clamp is installed near the lower end of the support plate.

[0013] Furthermore, the lower end of the liquid storage bag is a "V" structure, and a drainage pipe is installed at the lower end of the liquid storage bag, and a drainage valve is provided on the drainage pipe.

[0014] Furthermore, the measuring range of the precision scale line is 100ml, and the graduation of the precision scale line is 1ml, and the measuring range of the metering scale line is 2000ml, and the graduation of the metering scale line is 50ml.

[0015] The present invention has the following beneficial effects:

[0016] (1) The precision drainage liquid measuring bag, through the siphon effect of the n-shaped tube, sucks the liquid inside the precision measuring box into the liquid storage bag. Under the setting of the interception component, the connecting tube can be blocked during the drainage process of the precision measuring box, thereby avoiding the phenomenon that the precision measuring box is draining liquid while taking in liquid, thereby improving the accuracy of the measurement result.

[0017] (2) The precision drainage liquid metering bag can achieve the stability of the internal air pressure of the precision metering box and the liquid storage bag through the balance tube and the balance hole, thereby ensuring the stability of the n-shaped tube siphon triggering and further improving the accuracy of the metering result.

[0018] (3) The precision drainage fluid measuring bag can measure the number of times the precision metering box draws liquid through the measuring scale line. Under the setting of the precision scale line, the precise measurement of the remaining liquid in the precision metering box can be achieved. The combination of the two can accurately measure the drainage volume to milliliters, thereby improving the measurement accuracy of the equipment.

[0019] (4) The precision drainage liquid metering bag, through the setting of the linkage component, makes the liquid inside the long tube impact the force plate during the n-shaped tube siphoning, so that the force plate moves downward, and the nylon rope further pulls the piston downward to achieve the connection tube blocking. At the end of the siphoning, the liquid impact force on the force plate is zero. At this time, under the action of the return spring, the piston moves upward, thereby achieving the connection tube opening, and then no manual supervision and control are required, reducing manpower output.

[0020] (5) The precision drainage liquid metering bag can actively discharge the liquid inside the precision metering box when it does not touch the n-shaped tube siphon through the setting of the active output tube, thereby avoiding the drainage liquid residue inside the precision metering box and improving the practicality of the equipment.

[0021] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the present invention;

[0023] Figure 2 It is a schematic diagram of the back structure of the present invention;

[0024] Figure 3 It is a schematic diagram of the internal structure of the present invention;

[0025] Figure 4 It is a schematic diagram of the internal structure of the precision metering box in the present invention;

[0026] Figure 5 It is a structural schematic diagram of the linkage component in the present invention;

[0027] Figure 6 For the present invention Figure 4 A schematic diagram of the enlarged structure at A in the middle;

[0028] Figure 7 It is a schematic diagram of the internal structure of the sleeve in the present invention;

[0029] Figure 8 It is a schematic diagram of the installation structure of the piston in the present invention.

[0030] In the figure: 1. support plate; 2. handle; 3. base; 4. liquid storage bag; 5. precision metering box; 6. precision scale line; 7. metering scale line; 8. fixing clamp; 9. discharge pipe; 10. connecting pipe; 11. drainage pipe; 12. C-shaped pipe; 13. long pipe; 14. short pipe; 15. wedge block; 16. partition; 17. balance pipe; 18. active output pipe; 19. limit ring; 20. force plate; 21. notch groove; 22. slide rail; 23. cylindrical shell; 24. nylon string; 25. balance hole; 26. piston; 27. reset spring; 28. through hole. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inside", "all around" and the like indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0033] See also Figure 1-Figure 3 The embodiment of the present invention provides a precision drainage fluid metering bag, including a support plate 1 and a base 3 fixed on the support plate 1. The support plate 1 provides longitudinal support for the device during use to reduce the occurrence of inaccurate measurement results in the later stage caused by the force deformation of the device. The base 3 is preferably a component made of PE material, and the base 3 and the support plate 1 are connected by gluing. A precision metering box 5 is provided above the base 3. The precision metering box 5 here is used for accurately measuring the drainage fluid, and a liquid storage bag 4 is provided below the base 3. The liquid storage bag 4 is used to store the drainage fluid inside the precision metering box 5, and the liquid drained from the precision metering box 5 into the liquid storage bag 4 at a single time is quantitative (the single infusion is set to quantitative liquid a). The liquid storage bag 4 can also store and measure the number of times the drainage fluid inside the precision metering box 5 is emptied.

[0034] In order to achieve precise measurement of the above-mentioned precise measuring box 5, precise scale lines 6 are provided on the surface of the precise measuring box 5, and measuring scale lines 7 are provided on the surface of the liquid storage bag 4. The measuring scale lines 7 are used to measure the number of times the precise measuring box 5 draws liquid. Under the setting of the precise scale lines 6, precise measurement of the remaining liquid in the precise measuring box 5 can be achieved. The combination of the two can accurately measure the drainage volume to milliliters, thereby improving the measurement accuracy of the equipment.

[0035] Optionally, the precision metering box 5 is made of PVC material, PE material or PP material.

[0036] Preferably, the liquid storage bag 4 is made of polyvinyl chloride.

[0037] In addition, the range of the precision scale line 6 is 100ml, and the division of the precision scale line 6 is 1ml, then the above-mentioned quantitative liquid a is 100ml; the range of the measuring scale line 7 is 2000ml, and the division of the measuring scale line 7 is 50ml, the measuring scale line 7 is used to measure the number of times the precision metering box 5 draws liquid, and under the setting of the precision scale line 6, the precise measurement of the remaining liquid in the precision metering box 5 can be achieved, and the combination of the two can accurately measure the drainage volume to milliliters, thereby improving the measurement accuracy of the equipment.

[0038] See also Figure 3-Figure 5In order to input the drainage liquid inside the precision metering box 5 into the liquid storage bag 4, the above-mentioned precision drainage liquid metering bag, the precision drainage liquid metering bag in this embodiment is also provided with an n-shaped tube, the n-shaped tube includes a C-shaped tube 12, a long tube 13 arranged at one end of the C-shaped tube 12 and a short tube 14 at the other end of the C-shaped tube 12, the lower end of the short tube 14 is located near the bottom of the precision metering box 5, that is, the short tube 14 absorbs liquid from the lower end of the precision metering box 5, and the lower end of the long tube 13 is located at the top of the liquid storage bag 4, that is, the long tube 13 introduces the liquid sucked by the short tube 14 from the precision metering box 5 into the liquid storage bag 4, when the liquid level of the drainage liquid inside the precision metering box 5 reaches the C-shaped tube 12, fluid flow will appear in the n-shaped tube at this time, under the action of the n-shaped tube siphon, the drainage liquid inside the precision metering box 5 flows from the short tube 14, the C-shaped tube 12, and the long tube 13 to the inside of the liquid storage bag 4 in turn, so as to realize the storage of the drainage liquid.

[0039] The siphon action principle mentioned here is: the siphon phenomenon is essentially caused by the attraction and potential energy difference between liquid molecules. When the siphon tube (n-shaped tube in this scheme) is full of liquid and there is no gas, due to the effect of the earth's gravity, the gravity of the liquid in the tube is greater than the atmospheric pressure, causing the liquid to flow from high to low (the precision metering box 5 is at a high place and the liquid storage bag 4 is at a low place).

[0040] Preferably, the C-shaped tube 12, the long tube 13 and the short tube 14 are an integrated structure.

[0041] Optionally, the C-shaped tube 12, the long tube 13 and the short tube 14 are all PVC tubes, PE tubes or PP tubes.

[0042] Continue reading Figure 3-Figure 5 In order to avoid the air pressure difference between the precision metering box 5 and the liquid storage bag 4, which causes unstable siphon phenomenon, the precision drainage liquid metering bag in this embodiment also includes a balance tube 17, which is arranged on the base 3, and the upper end of the balance tube 17 is higher than the C-shaped tube 12 to avoid the drainage liquid inside the precision metering box 5 from flowing into the liquid storage bag 4 from the balance tube 17, and the lower end of the balance tube 17 is flush with the top of the liquid storage bag 4, so that the air pressure inside the liquid storage bag 4 and the precision metering box 5 is the same, thereby establishing a stable siphon environment. In addition, the upper end of the balance tube 17 is symmetrically provided with a balance hole 25, and the balance hole 25 is preferably opened on the side of the balance tube 17 near the upper end to avoid the drainage liquid from entering the liquid storage bag 4 along the balance tube 17 when it is input into the precision metering box 5.

[0043] See also Figure 3-Figure 8In order to prevent the internal drainage liquid of the precision metering box 5 from still being input with drainage liquid during the emptying process, resulting in the amount of liquid discharged from the precision metering box 5 by the n-shaped tube at a single time being greater than the quantitative liquid a, the precision drainage liquid metering bag in this embodiment also includes a cut-off component, which is used to block the input end of the precision metering box 5 during the emptying stage of the internal drainage liquid of the precision metering box 5, that is, when the precision metering box 5 is drained by the n-shaped tube, the precision metering box 5 no longer takes in liquid.

[0044] Specifically, a connecting tube 10 is provided at the upper end of the precision metering box 5, and a shut-off component is provided on the connecting tube 10. The shut-off component blocks the connecting tube 10 during the discharge process of the n-shaped tube, thereby preventing the precision metering box 5 from discharging liquid while taking in liquid, thereby improving the accuracy of the metering result.

[0045] See also Figure 3-Figure 8 The above-mentioned interception component includes a cylindrical shell 23 vertically installed on the connecting tube 10. The connection between the cylindrical shell 23 and the connecting tube 10 is symmetrically provided with through holes 28 to ensure the normal input of the drainage fluid, and an axially slidable piston 26 is provided inside the cylindrical shell 23. When the piston 26 moves downward, the through hole 28 can be blocked, thereby realizing the cutoff of the connecting tube 10, and further controlling the input of the drainage fluid. A reset spring 27 is installed between the upper end of the piston 26 and the top end of the cylindrical shell 23. The reset spring 27 can be used for resetting the piston 26 after it moves downward, so that the piston 26 is above the through hole 28, so that the connecting tube 10 is in a passage state, and the normal input of the drainage fluid is realized.

[0046] In addition, the precision drainage liquid measuring bag further comprises a linkage assembly, which can pull the piston 26 down when impacted by the liquid inside the long tube 13 to block the through hole 28 .

[0047] See also Figure 3-Figure 5 The above-mentioned linkage component includes a force-bearing plate 20 slidably installed on the upper end of the liquid storage bag 4. The force-bearing plate 20 is made of lightweight plastic to ensure that displacement can be generated when the liquid inside the long tube 13 is impacted. The force-bearing plate 20 is located at the lower end of the long tube 13, which can block the drainage fluid output by the long tube 13, so that the force-bearing plate 20 is displaced by the impact of the drainage fluid. In order to achieve the linkage between the force-bearing plate 20 and the piston 26, a nylon string 24 is fixed on the force-bearing plate 20. The nylon string 24 passes through the balance tube 17 and is fixedly connected to the piston 26. The force-bearing plate 20 is impacted by the drainage fluid output by the long tube 13 and moves downward, thereby pulling the nylon string 24, and the piston 26 is pulled to move by the nylon string 24, and then the connecting tube 10 can be blocked.

[0048] See also Figure 3In order to improve the stability of the force-bearing plate 20 during movement, a notch groove 21 is provided at one end of the force-bearing plate 20, and a slide rail 22 is provided on the inner wall of the liquid storage bag 4 that is slidably connected to the notch groove 21. Improving the sliding connection between the notch groove 21 and the slide rail 22 can prevent the force-bearing plate 20 from rotating laterally, thereby ensuring that the force-bearing plate 20 can always be subjected to the impact force of the drainage fluid output by the long tube 13.

[0049] See also Figure 3-Figure 5 In order to prevent drainage fluid residue from appearing inside the precision metering box 5, an active output tube 18 is provided inside the base 3. Preferably, the active output tube 18 is a hard tube. The upper end of the active output tube 18 is flush with the bottom of the precision metering box 5, so that the drainage fluid at the bottom of the precision metering box 5 can be effectively discharged, and the lower end of the active output tube 18 extends into the liquid storage bag 4. A manual valve for controlling the opening and closing is installed in the middle of the active output tube 18. An opening for accommodating the manual valve should be provided on the base 3 so that the manual valve is exposed to the outside of the base 3 for manual control.

[0050] See also Figure 3-Figure 5 The lower end of the active output tube 18 passes through the force plate 20 and is installed with a limiting ring 19. The force plate 20 slides on the active output tube 18 to achieve traction of the force plate 20. In addition, the limiting ring 19 is used to limit the force plate 20 from being separated from the active output tube 18.

[0051] See also Figure 2 and Figure 4 A wedge block 15 is provided at the bottom of the precision metering box 5 at a position relative to the active output tube 18. The setting of the wedge block 15 forms an inclined structure near the lower end of the precision metering box 5 to facilitate the discharge of the drainage fluid. A partition 16 is also provided in the precision metering box 5. The setting of the partition 16 can improve the strength of the precision metering box 5 to avoid the precision metering box 5 being deformed by force and affecting the metering accuracy.

[0052] See also Figure 1-Figure 3 The connecting tube 10 is a hard tube, and one end of the connecting tube 10 extends to the outside of the precision metering box 5 and is provided with a drainage tube 11 for inputting drainage fluid.

[0053] In addition, in order to facilitate the use of the present device, a handle 2 is provided near the upper end of the support plate 1 to facilitate carrying and hanging of the present device, and a fixing clip 8 is installed near the lower end of the support plate 1. Through the setting of the fixing clip 8, the lower end of the support plate 1 can be fixed to prevent the support plate 1 from shaking significantly.

[0054] See also Figure 1 and Figure 2In order to facilitate the discharge of the drainage liquid inside the liquid storage bag 4, the lower end of the liquid storage bag 4 is a "V" structure. The setting of the "V" structure is conducive to the discharge of the drainage liquid inside the liquid storage bag 4, and a drainage pipe 9 is installed at the lower end of the liquid storage bag 4. The drainage pipe 9 is provided with a drainage valve, which can be used to control the discharge of the drainage liquid inside the liquid storage bag 4.

[0055] When in use (when working), the lower end of the support plate 1 can be fixed by setting the fixing clip 8 to prevent the support plate 1 from shaking significantly, and the drainage liquid is input from the drainage tube 11 to the inside of the connecting tube 10. Under the setting of the through hole 28, the drainage liquid enters the inside of the precision metering box 5 from the connecting tube 10, and the air pressure inside the liquid storage bag 4 and the precision metering box 5 is the same through the balance tube 17 and the balance hole 25, thereby establishing a stable siphon environment for the n-shaped tube, and the liquid level of the drainage liquid in the precision metering box 5 reaches 100m At 1, that is, when the liquid level of the drainage liquid in the precision metering box 5 reaches the C-shaped tube 12, fluid flow will occur inside the n-shaped tube. Under the action of the n-shaped tube siphon, the drainage liquid in the precision metering box 5 flows from the short tube 14, the C-shaped tube 12, and the long tube 13 to the liquid storage bag 4 in sequence, so as to store the drainage liquid. In this process, the force plate 20 blocks the drainage liquid output from the long tube 13, so that the force plate 20 is impacted by the drainage liquid output from the long tube 13 and moves downward, passing through the notch groove 21 and the slide rail. The sliding connection between the two ends of the piston 22 is used to limit the force plate 20, so that the force plate 20 pulls the nylon string 24, and the piston 26 is pulled by the nylon string 24 to move, so that the piston 26 blocks the through hole 28, and then the connection pipe 10 can be blocked, thereby avoiding the phenomenon that the precision metering box 5 discharges liquid while taking in liquid, and improving the accuracy of the metering result. When there is no drainage liquid output in the long tube 13, the reset spring 27 is pulled back to realize the reset of the piston 26 after the piston 26 descends, so that the piston 26 It is located above the through hole 28 so that the connecting tube 10 is in a passage state, realizing the normal input of drainage fluid. At the end of drainage, drainage fluid remains in the precision metering box 5. At this time, the liquid level of the drainage fluid is not enough to trigger the siphon phenomenon. The precision scale line 6 is observed to realize the accurate measurement of the remaining drainage fluid. The metering scale line 7 is observed again, and the number of times the drainage fluid in the precision metering box 5 is emptied is calculated through the metering scale line 7. The combination of the two can accurately measure the drainage volume to milliliters, thereby improving the metering accuracy of the equipment. At this time, the manual valve is opened to make the active output tube 18 in a flow state. The drainage fluid at the bottom of the precision metering box 5 is effectively discharged through the active output tube 18, thereby avoiding the residual drainage fluid in the precision metering box 5 and improving the practicality of the equipment. In addition, the wedge block 15 is arranged to form an inclined surface structure near the lower end of the precision metering box 5 to facilitate the discharge of the drainage fluid in the precision metering box 5. The partition 16 is arranged to improve the strength of the precision metering box 5 to avoid the deformation of the precision metering box 5 due to force and affect the metering accuracy.

[0056] It should be noted that, in this article, relational terms such as first and second, etc. 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 terms "include", "comprise" or any other variants thereof are 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.

[0057] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A precision drainage fluid measuring bag, characterized in that: include: A support plate (1) and a base (3) fixed on the support plate (1), a precision metering box (5) being provided above the base (3), and a liquid storage bag (4) being provided below the base (3), the surface of the precision metering box (5) being provided with precision graduation lines (6), the surface of the liquid storage bag (4) being provided with metering graduation lines (7), and the liquid storage bag (4) being used to receive a fixed amount of liquid from the precision metering box (5); and an n-shaped tube, the n-shaped tube comprising a C-shaped tube (12), a long tube (13) arranged at one end of the C-shaped tube (12), and a short tube (14) at the other end of the C-shaped tube (12), the lower end of the short tube (14) being located near the bottom of the precision metering box (5), and the lower end of the long tube (13) being located at the top end inside the liquid storage bag (4); and a balance tube (17), the balance tube (17) being arranged on the base (3), the upper end of the balance tube (17) being higher than the C-shaped tube (12), and the lower end of the balance tube (17) being flush with the top end of the liquid storage bag (4), so that the internal air pressure of the liquid storage bag (4) and the precision metering box (5) are the same, and the upper end of the balance tube (17) is symmetrically provided with balance holes (25); and A shutoff component is provided at the upper end of the precision metering box (5), and a connecting pipe (10) is provided on the connecting pipe (10). The shutoff component blocks the connecting pipe (10) during the n-shaped pipe drainage process. The shutoff assembly comprises a cylindrical outer shell (23) vertically mounted on the connecting pipe (10), through holes (28) are symmetrically provided at the connection between the cylindrical outer shell (23) and the connecting pipe (10), and an axially slidable piston (26) is provided inside the cylindrical outer shell (23), and a return spring (27) is installed between the upper end of the piston (26) and the top end inside the cylindrical outer shell (23); The precision drainage liquid metering bag also includes a linkage component, which can pull the piston (26) down when impacted by the liquid inside the long tube (13) to block the through hole (28).

2. A precision drainage fluid measuring bag according to claim 1, characterized in that: The linkage assembly comprises a force-bearing plate (20) slidably mounted on the upper end of the liquid storage bag (4), and the force-bearing plate (20) is located at the lower end of the long tube (13). A nylon string (24) is fixed on the force-bearing plate (20), and the nylon string (24) passes through a balance tube (17) and is fixedly connected to a piston (26).

3. A precision drainage fluid measuring bag according to claim 2, characterized in that: A notch groove (21) is provided at one end of the force-bearing plate (20), and a slide rail (22) slidably connected to the notch groove (21) is provided on the inner wall of the liquid storage bag (4).

4. A precision drainage fluid measuring bag according to claim 3, characterized in that: An active output tube (18) is provided inside the base (3), the upper end of the active output tube (18) is flush with the bottom of the precision metering box (5), and the lower end of the active output tube (18) extends into the liquid storage bag (4), and a manual valve for controlling opening and closing is installed in the middle of the active output tube (18), and the manual valve is exposed outside the base (3).

5. A precision drainage fluid measuring bag according to claim 4, characterized in that: The lower end of the active output tube (18) passes through the force-bearing plate (20) and is installed with a limiting ring (19), wherein the limiting ring (19) is used to limit the force-bearing plate (20) from being separated from the active output tube (18).

6. A precision drainage fluid measuring bag according to any one of claims 1 to 5, characterized in that: A wedge block (15) is provided at a position of the bottom of the precision metering box (5) relative to the active output pipe (18), and a partition plate (16) is also provided inside the precision metering box (5).

7. A precision drainage fluid measuring bag according to claim 6, characterized in that: The connecting pipe (10) is a hard pipe, and one end of the connecting pipe (10) extends outside the precision metering box (5) and is provided with a drainage pipe (11); The support plate (1) is provided with a handle (2) near the upper end, and a fixing clamp (8) is installed near the lower end of the support plate (1).

8. A precision drainage fluid measuring bag according to claim 6, characterized in that: The lower end of the liquid storage bag (4) is a "V"-shaped structure, and a liquid discharge pipe (9) is installed at the lower end of the liquid storage bag (4), and a liquid discharge valve is provided on the liquid discharge pipe (9).

9. A precision drainage fluid measuring bag according to claim 1, characterized in that: The measuring range of the precision scale line (6) is 100ml, and the graduation of the precision scale line (6) is 1ml. The measuring range of the metering scale line (7) is 2000ml, and the graduation of the metering scale line (7) is 50ml.

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