A negative pressure drainage device to prevent backflow

Abstract

This utility model relates to a negative pressure drainage device for preventing backflow, comprising a mounting body with a hollow tubular structure. The mounting body has a forward mounting area and a reverse mounting area at its two ends. The component preventing backflow of drainage fluid includes an annular fixing seat circumferentially fixed inside the hollow tubular structure. One end of a movable stop is connected to the side of the annular fixing seat near the reverse mounting area. The movable stop is located between the annular fixing seat and the reverse mounting area. When the pressure in the reverse mounting area is lower than that in the forward mounting area, the movable stop moves to open the inner circle of the annular fixing seat, connecting it to the drainage channel. When the pressure in the reverse mounting area is higher than or equal to that in the forward mounting area, the movable stop moves back to close the opening formed by the inner circle of the annular fixing seat. This utility model has a simple structure, is easy to use, and can handle sudden situations in clinical settings. It eliminates the need for manual opening and closing, promptly preventing backflow of drainage fluid and reducing the burden on family caregivers.

Description

Technical Field

[0001] This utility model relates to a medical device, and more particularly to a negative pressure drainage device for preventing backflow. Background Technology

[0002] Currently, negative pressure drainage is a very common treatment method for draining fluid from patients' bodies, especially during abdominal drainage. Normally, medical staff connect a drainage tube extending from the patient's abdomen to a negative pressure tank, and the other end of the tank is connected to a device that provides negative pressure to drain the abdominal fluid. However, due to patient movement, improper operation by family members, or other reasons, the connection between the drainage tube and the negative pressure tank may break, or the negative pressure pump connected to the tank may malfunction. These factors can cause backflow of the drainage fluid. However, some anti-backflow negative pressure drainage devices on the market either require medical staff to activate them only as needed, making them unable to handle sudden backflow problems, or their complex structure causes slightly viscous fluid to accumulate at the anti-backflow location, hindering drainage and posing a risk of contamination over time. Therefore, these problems need to be addressed. Utility Model Content

[0003] This invention provides a negative pressure drainage device to prevent backflow, which solves the problem of drainage fluid backflow that cannot be dealt with in case of emergencies.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows: a negative pressure drainage device for preventing backflow, comprising an installation body, wherein the installation body has a hollow tubular structure, and its two ends respectively form a forward installation area and a reverse installation area;

[0005] The component for preventing backflow of drainage fluid includes an annular fixing seat circumferentially fixed inside a hollow tubular structure. One end of a movable stop is connected to the side of the annular fixing seat near the reverse installation area. The movable stop is located between the annular fixing seat and the reverse installation area. When the pressure in the reverse installation area is lower than that in the forward installation area, the movable stop moves to open the inner circle of the annular fixing seat and connect it to the drainage channel. When the pressure in the reverse installation area is higher than or equal to that in the forward installation area, the movable stop moves back to close the opening formed by the inner circle of the annular fixing seat.

[0006] As a further improvement, the annular fixing seat includes a mounting part and a guide part integrally formed with the mounting part. The guide part is close to the forward mounting area, and the mounting part is close to the reverse mounting area and is used to connect one end of the movable stop. The guide part is a smooth transition position from the inner wall surface of the mounting part to one side surface of the mounting part, and the inner surface of the guide part is connected to the inner circular surface of the mounting part.

[0007] As a further improvement, the movable stop includes a funnel-shaped liquid inlet and a movable switch that communicates with the funnel-shaped liquid inlet. The end of the liquid inlet with a larger diameter is fixedly connected to one side of the annular fixed seat, and the end of the liquid inlet with a smaller diameter is integrally formed with one end of the movable switch. The movable switch includes a first movable silicone sheet and a second movable silicone sheet. The two sides of the first movable silicone sheet are integrally formed with the two sides of the second movable silicone sheet, and the inner surfaces of the first movable silicone sheet and the second movable silicone sheet are in contact.

[0008] As a further improvement, the movable stop is a conical structure formed by the contact of the sidewall surfaces of at least four movable silicone baffles. The bottom of all the movable silicone baffles is integrally formed into a circle. The bottom of the movable silicone baffle is fixedly connected to the annular fixing seat, and the other end extends towards the reverse installation area.

[0009] As a further improvement, each of the movable silicone baffles extends from the top in a direction away from the bottom to form a silicone extension section, the inner surfaces of the silicone extension sections contacting each other when the tops of all the movable silicone baffles are closed.

[0010] As a further improvement, the movable stop includes a circular movable silicone baffle. The surface of the circular movable silicone baffle is formed with a strip-shaped support portion that divides it into two semicircles. The two ends of the support portion are fixed to the surface of the annular fixing seat near the reverse installation area. The side of the annular fixing seat near the reverse installation area forms a limiting area, and the edge of the circular movable silicone baffle covers the limiting area.

[0011] As a further improvement, the forward mounting area is set as the input end of the drainage fluid, and the reverse mounting area is set as the connection end for connecting the negative pressure device.

[0012] As a further improvement, the annular fixing seat is positioned near the forward mounting area within the mounting body.

[0013] As a further improvement, the forward installation area and the reverse installation area are respectively set as connection ends for connecting the drainage tube and the negative pressure device.

[0014] As a further improvement, the mounting body is transparent.

[0015] The above-mentioned technical solution of this utility model has the following beneficial effects: When the anti-backflow negative pressure drainage device of this application is used, the pressure difference between the positive installation area and the reverse installation area causes the movable stop to move, thereby connecting the inner circle of the annular fixing seat with the interior of the hollow tubular structure to form a drainage channel, allowing the drainage fluid to pass smoothly. When the connection with the negative pressure tank is broken or the negative pressure pump fails, the movable stop will move and reset, thereby closing the inner circle of the annular fixing seat, blocking the drainage channel, and preventing the drainage fluid from flowing back into the patient's body and causing infection. The anti-backflow negative pressure drainage device of this application has a simple structure, is easy to use, and can deal with sudden situations in clinical practice where the pipeline is broken or the device providing negative pressure fails due to the patient's own reasons. It does not require manual opening and closing, and automatically blocks the drainage channel immediately after the negative pressure disappears, promptly preventing the drainage fluid from flowing back and reducing the pressure on family caregivers. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the present utility model;

[0017] Figure 2 This is a schematic diagram of the overall structure of one embodiment of the present utility model;

[0018] Figure 3 This is a schematic diagram of the overall structure of one embodiment of the present utility model;

[0019] Figure 4 This is a schematic diagram of the overall structure of one embodiment of the present utility model;

[0020] Figure 5 This is a schematic diagram of the overall structure of one embodiment of the present utility model;

[0021] Figure 6 This is a schematic diagram of the overall structure of one embodiment of the present utility model;

[0022] Figure 7 This is a schematic diagram of the overall structure of one embodiment of the present utility model;

[0023] Figure 8 This is a schematic diagram of the overall structure of one embodiment of the present invention.

[0024] Reference numerals: 1. Mounting body, 2. Forward mounting area, 3. Reverse mounting area, 4. Component to prevent backflow of drainage fluid, 5. Annular fixing seat, 6. Movable stop, 7. Drainage channel, 8. Opening, 9. Mounting part, 10. Guide part, 11. Liquid inlet part, 12. Movable switch part, 13. First movable silicone sheet, 14. Second movable silicone sheet, 15. Movable silicone baffle, 16. Silicone extension section, 17. Circular movable silicone baffle, 18. Support part, 19. Limiting area, 20. Input end, 21. Connecting end. Detailed Implementation

[0025] The following embodiments further illustrate the content of this utility model, but should not be construed as limiting the utility model. Any modifications or substitutions made to the methods, steps, or conditions of this utility model without departing from its spirit and essence are within the scope of this utility model.

[0026] The anti-reflux negative pressure drainage device of this application is used when patients undergo negative pressure drainage, especially abdominal drainage. Normally, during drainage, a drainage tube extending from the abdomen is connected to a negative pressure tank to utilize negative pressure for drainage. However, due to patient movement, improper operation by family members, or other reasons, the connection between the drainage tube and the negative pressure tank may break, or the negative pressure pump connected to the negative pressure tank may malfunction. These factors can all cause drainage fluid to reflux. To address this, the anti-reflux negative pressure drainage device of this application connects the positive mounting area 2 to the output end of the drainage tube connected to the patient, or preferably, directly installs the positive mounting area 2 at the site where drainage is needed. This further prevents drainage fluid reflux when the connection between the positive mounting area 2 and the output end of the drainage tube breaks.

[0027] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings and examples.

[0028] Please see Figures 1 to 8 As shown, the present invention discloses a negative pressure drainage device for preventing backflow, comprising a mounting body 1, wherein the mounting body 1 has a hollow tubular structure, and its two ends respectively form a forward mounting area 2 and a reverse mounting area 3;

[0029] The anti-backflow component 4 includes an annular fixing seat 5 circumferentially fixed inside a hollow tubular structure. The side of the annular fixing seat 5 closest to the reverse installation area 3 is connected to one end of a movable stop 6. The movable stop 6 is located between the annular fixing seat 5 and the reverse installation area 3. When the pressure in the reverse installation area 3 is lower than that in the forward installation area 2, the movable stop 6 moves to open the inner circle of the annular fixing seat 5 and connect it to the drainage channel 7. When the pressure in the reverse installation area 3 is higher than or equal to that in the forward installation area 2, the movable stop 6 moves to reset and close the opening 8 formed by the inner circle of the annular fixing seat 5. In other words, the movable stop 6 is used to open and close the drainage channel 7 formed by the inner circle of the annular fixing seat 5. The forward installation area 2 and the reverse installation area 3 are formed at both ends of the hollow tubular structure mounting body 1, respectively.

[0030] When the anti-reflux negative pressure drainage device of this application is used during negative pressure drainage, the forward installation area 2 can be connected to one end of the drainage tube drawn from the patient's body, or it can be directly connected to one end of the patient's body. The forward installation area 2 can also be considered the inlet end 20 of the drainage fluid. The reverse installation area 3 can be used to connect to a negative pressure device, which includes a negative pressure pump, a suction end of a negative pressure tank, or a negative pressure pipeline connected to the suction end of the negative pressure pump or negative pressure tank. The reverse installation area 3 can also be considered the outlet end of the drainage fluid. The other end of the reverse installation area 3 is connected to the negative pressure tank. The other end of the negative pressure tank is connected to the negative pressure pump or to the negative pressure interface on the patient's bedside. Both the negative pressure pump and the negative pressure interface on the patient's bedside are used to provide negative pressure to the negative pressure tank. Since the annular fixing seat 5 is circumferentially fixed to the hollow tube... The inner circle of the annular fixing seat 5 connects with the interior of the hollow tubular structure to form a drainage channel 7. The side of the annular fixing seat 5 closest to the reverse installation area 3 is connected to one end of the movable stop 6. The movable stop 6 is located between the annular fixing seat 5 and the reverse installation area 3. When the negative pressure is activated, a pressure difference is created between the forward installation area 2 and the reverse installation area 3, causing the movable stop 6 to move. This connects the inner circle of the annular fixing seat 5 with the interior of the hollow tubular structure, forming the drainage channel 7, allowing the drainage fluid to pass smoothly. If the connection to the negative pressure tank breaks or the negative pressure pump malfunctions, the movable stop 6 will move and reset, closing the inner circle of the annular fixing seat 5, blocking the drainage channel 7, and preventing the drainage fluid from flowing back into the patient's body and causing infection.

[0031] It should be noted that the movable baffle 6 includes, but is not limited to, the following structure: Structure 1, the movable baffle 6 includes a funnel-shaped liquid inlet 11 and a movable switch 12 communicating with the funnel-shaped liquid inlet 11. The end of the liquid inlet 11 with a larger diameter is fixedly connected to one side of the annular fixed seat 5, and the end of the liquid inlet 11 with a smaller diameter is integrally formed with one end of the movable switch 12. The movable switch 12 includes a first movable silicone sheet 13 and a second movable silicone sheet 14. The two sides of the first movable silicone sheet 13 are integrally formed with the two sides of the second movable silicone sheet 14, respectively. The inner surfaces of the first movable silicone sheet 13 and the second movable silicone sheet 14 are in contact. When the anti-backflow of this application... When the negative pressure drainage device is in use, after the negative pressure is turned on, a pressure difference is formed between the forward installation area 2 and the reverse installation area 3, causing the inner surfaces of the first movable silicone sheet 13 and the second movable silicone sheet 14 to disengage. This connects the inner circle of the annular fixing seat 5 with the interior of the hollow tubular structure, forming a drainage channel 7, allowing the drainage fluid to pass smoothly. Since the original shape of the first movable silicone sheet 13 and the second movable silicone sheet 14 was in a state of mutual contact between their inner surfaces, after the negative pressure disappears, the first movable silicone sheet 13 and the second movable silicone sheet 14 return to their original shape, thereby closing the inner circle of the annular fixing seat 5, blocking the drainage channel 7, and preventing the drainage fluid from flowing back into the patient's body and causing infection.

[0032] The second structure of the movable baffle 6 is a conical structure formed by the contact of the sidewall surfaces of at least four movable silicone baffles 15. The bottom of all movable silicone baffles 15 is integrally formed into a circle, and the bottom of the movable silicone baffles 15 is fixedly connected to the annular fixing seat 5. The other end extends towards the reverse installation area 3. When the anti-backflow negative pressure drainage device of this application is used, after the negative pressure is turned on, due to the flexibility of the movable silicone baffles 15, a pressure difference is formed between the forward installation area 2 and the reverse installation area 3, causing all the movable silicone baffles 15 to open in a direction away from each other, and their sidewall surfaces to release contact with each other, so that the inner circle of the annular fixing seat 5 is connected to the interior of the hollow tubular structure to form a drainage channel 7, allowing the drainage fluid to pass smoothly. The original form of the movable silicone baffles 15 is that the sidewall surfaces are in contact with each other. Therefore, after the negative pressure disappears, all the movable silicone baffles 15 return to their original shape, thereby closing the inner circle of the annular fixing seat 5, blocking the drainage channel 7, and preventing the drainage fluid from flowing back into the patient's body and causing infection. In order to further achieve the purpose of better preventing the drainage fluid from flowing back into the patient's body and causing infection, each movable silicone baffle 15 preferably extends from the top to the direction away from the bottom to form a silicone extension section 16. The silicone extension section 16 is preferably a strip structure. When the top of all the movable silicone baffles 15 is closed, the inner surfaces of the silicone extension section 16 are in contact, further shielding the top of the formed cone, and further achieving the purpose of better preventing the drainage fluid from flowing back into the patient's body and causing infection.

[0033] The third structure of the movable stop 6 includes a circular movable silicone baffle 17. The surface of the circular movable silicone baffle 17 is divided into two semicircles by strip-shaped support portions 18. Both ends of the support portions 18 are fixed to the surface of the annular fixing seat 5 near the reverse installation area 3. The annular fixing seat 5 near the reverse installation area 3 forms a limiting area 19. The edge of the circular movable silicone baffle 17 covers the limiting area 19. When the anti-backflow negative pressure drainage device of this application is used, after the negative pressure is activated, due to the flexibility of the circular movable silicone baffle 17, when the forward installation... A pressure difference is created between zone 2 and the reverse installation zone 3, causing the circular movable silicone baffle 17 to open towards the reverse installation zone 3, releasing it from contact with the limiting zone 19. This allows the inner circle of the annular fixing seat 5 to connect with the interior of the hollow tubular structure, forming a drainage channel 7, allowing the drainage fluid to pass smoothly. Since the original shape of the circular movable silicone baffle 17 is circular and its edge covers the limiting zone 19, after the negative pressure disappears, the circular movable silicone baffle 17 returns to its original shape, thereby closing the inner circle of the annular fixing seat 5, blocking the drainage channel 7, and preventing the drainage fluid from flowing back into the patient's body and causing infection.

[0034] The anti-reflux negative pressure drainage device of this application has a simple structure and is easy to use. It can deal with sudden situations in clinical practice where the pipeline is disconnected or the device providing negative pressure fails due to the patient's own reasons. It does not require manual opening and closing. It automatically blocks the drainage channel 7 immediately after the negative pressure disappears, so as to avoid the backflow of drainage fluid in time and reduce the pressure on family caregivers.

[0035] Please refer to the following: Figures 1 to 8 As shown, specifically, the annular fixing seat 5 includes a mounting part 9 and a guide part 10 integrally formed with the mounting part 9. The guide part 10 is close to the forward mounting area 2, and the mounting part 9 is close to the reverse mounting area 3 and is used to connect one end of the movable stop 6. The guide part 10 is a smooth transition position from the inner wall surface of the mounting body 1 to one side surface of the mounting part 9. The inner side surface of the guide part 10 is connected to the inner circular surface of the mounting part 9. Since the drainage fluid is not like water and has a certain viscosity, the drainage fluid first passes through the guide part 10. Because the guide part 10 is a smooth transition position from the inner wall surface of the mounting body 1 to one side surface of the mounting part 9, and the inner side surface of the guide part 10 is connected to the inner circular surface of the mounting part 9, the drainage fluid can pass smoothly through the annular fixing seat 5 to avoid drainage fluid residue causing pollution. In order to clearly see the relationship between the guide part 10 and the mounting part 9 and the position of the guide part 10, the cross-sectional position of the guide part 10 is filled with black. However, it should be noted that the channel formed on the inner wall surface of the guide part 10 is for the drainage fluid to pass through.

[0036] Please refer to section 3 and... Figure 4As shown, specifically, the movable baffle 6 includes a funnel-shaped liquid inlet 11 and a movable switch 12 communicating with the funnel-shaped liquid inlet 11. The larger diameter end of the liquid inlet 11 is fixedly connected to one side of the annular fixed seat 5, and the smaller diameter end of the liquid inlet 11 is integrally formed with one end of the movable switch 12. The movable switch 12 includes a first movable silicone sheet 13 and a second movable silicone sheet 14. The two sides of the first movable silicone sheet 13 are integrally formed with the two sides of the second movable silicone sheet 14, respectively. The inner surfaces of the first movable silicone sheet 13 and the second movable silicone sheet 14 are in contact. When the anti-backflow negative pressure drainage device of this application is used... After the negative pressure is activated, a pressure difference is created between the forward installation area 2 and the reverse installation area 3, causing the inner surfaces of the first movable silicone pad 13 and the second movable silicone pad 14 to disengage. This connects the inner circle of the annular fixing seat 5 with the interior of the hollow tubular structure, forming a drainage channel 7, allowing the drainage fluid to pass smoothly. Since the original shape of the first movable silicone pad 13 and the second movable silicone pad 14 was in contact with each other, after the negative pressure disappears, the first movable silicone pad 13 and the second movable silicone pad 14 return to their original shape, thereby closing the inner circle of the annular fixing seat 5, blocking the drainage channel 7, and preventing the drainage fluid from flowing back into the patient's body and causing infection.

[0037] Please refer to the following: Figures 5 to 7 As shown, specifically, the movable baffle 6 is a conical structure formed by the contact of the sidewall surfaces of at least four movable silicone baffles 15. The bottom of all movable silicone baffles 15 is integrally formed into a circle. The bottom of the movable silicone baffles 15 is fixedly connected to the annular fixing seat 5, and the other end extends towards the reverse installation area 3. When the anti-backflow negative pressure drainage device of this application is used, after the negative pressure is turned on, due to the flexibility of the movable silicone baffles 15, a pressure difference is formed between the forward installation area 2 and the reverse installation area 3, causing all movable silicone baffles 15 to open in a direction away from each other, and their sidewall surfaces to release contact with each other, so that the inner circle of the annular fixing seat 5 is connected to the interior of the hollow tubular structure to form a drainage channel 7, allowing the drainage fluid to pass smoothly. Since the original shape of all movable silicone baffles 15 is a state of contact between the sidewall surfaces that are close to each other, after the negative pressure disappears, all movable silicone baffles 15 return to their original shape, thereby closing the inner circle of the annular fixing seat 5, blocking the drainage channel 7, and preventing the drainage fluid from flowing back into the patient's body and causing infection.

[0038] Please refer to the following: Figure 7 As shown, specifically, each of the movable silicone baffles 15 extends from the top away from the bottom to form a silicone extension section 16. The silicone extension section 16 is preferably a strip structure. When the tops of all the movable silicone baffles 15 are closed, the inner surfaces of the silicone extension sections 16 come into contact, further shielding the top of the formed cone, and further achieving the purpose of better preventing the drainage fluid from flowing back into the patient's body and causing infection.

[0039] Please refer to the following: Figure 1 as well as Figure 2 As shown, specifically, the movable stop 6 includes a circular movable silicone baffle 17. The surface of the circular movable silicone baffle 17 is formed with strip-shaped support portions 18 that divide it into two semicircles. The two ends of the support portions 18 are fixed to the surface of the annular fixing seat 5 near the reverse installation area 3. The annular fixing seat 5 near the reverse installation area 3 forms a limiting area 19. The edge of the circular movable silicone baffle 17 covers the limiting area 19. When the anti-backflow negative pressure drainage device of this application is used, after the negative pressure is activated, due to the flexibility of the circular movable silicone baffle 17, when the forward installation area 2... A pressure difference is created between the circular movable silicone baffle 17 and the reverse installation area 3, causing the circular movable silicone baffle 17 to open towards the reverse installation area 3, releasing the contact with the limiting area 19. This allows the inner circle of the annular fixing seat 5 to connect with the interior of the hollow tubular structure, forming a drainage channel 7, allowing the drainage fluid to pass smoothly. Since the original shape of the circular movable silicone baffle 17 is circular and its edge covers the limiting area 19, after the negative pressure disappears, the circular movable silicone baffle 17 returns to its original shape, thereby closing the inner circle of the annular fixing seat 5, blocking the drainage channel 7, and preventing the drainage fluid from flowing back into the patient's body and causing infection.

[0040] Please refer to the following: Figure 8 As shown in the figure, the disconnected position represents the omitted overall length of the anti-backflow negative pressure drainage device. Specifically, the forward installation area 2 is set as the inlet 20 of the drainage fluid, and the reverse installation area 3 is set as the connection end 21 of the negative pressure device. This can be understood as follows: the anti-backflow negative pressure drainage device of this application is an anti-backflow negative pressure drainage tube. The length, inner diameter, and outer diameter can be set according to actual needs. The forward installation area 2 being set as the inlet 20 of the drainage fluid means that the structural shape of the forward installation area 2 can be directly used for the patient's drainage site. The length, inner diameter, and outer diameter of this area can be set according to actual needs, reducing the number of pipe interfaces on the entire drainage channel 7. In particular, it avoids the problem of the drainage tube connection breaking due to the patient turning over or other activities during use. The longer anti-backflow negative pressure drainage device also makes it easier for the patient to turn over.

[0041] Please refer to the following: Figure 8 As shown, specifically, the annular fixing seat 5 is located within the mounting body 1 near the forward mounting area 2. When the patient exerts abdominal force due to sitting up, turning over, coughing, or other actions in bed, causing a sudden increase in abdominal pressure, the movable stop 6 moves to open, connecting the inner circle of the annular fixing seat 5 with the drainage channel 7. Because the annular fixing seat 5 is located within the mounting body 1 near the forward mounting area 2, the drainage fluid can immediately enter the channel formed on one side of the forward mounting area 2 into the channel formed on one side of the reverse mounting area 3, which is more conducive to the drainage of fluid accumulated in the patient's body.

[0042] Please refer to the following: Figures 1 to 7 As shown, specifically, the forward installation area 2 and the reverse installation area 3 are respectively set as the connection ends 21 for connecting the drainage tube and the negative pressure device. That is, the forward installation area 2 is used to connect the extension end of the drainage tube that has been placed in the patient's body, and the connection is made in a detachable manner. The reverse installation area 3 is used to connect the negative pressure device, and is detachably connected to the negative pressure device. This makes the anti-reflux negative pressure drainage device of this application compact in structure, easy to disassemble and replace, and can be installed when needed, adapting to more drainage tubes.

[0043] Please refer to the following: Figures 1 to 8 As shown, specifically, the mounting body 1 is transparent, making it easy to observe the drainage fluid through the outside of the mounting body 1.

[0044] The above-described embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made by those skilled in the art to the technical solutions of the present utility model without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A negative pressure drainage device for preventing backflow, characterized in that: include The mounting body (1) is a hollow tubular structure, with a forward mounting area (2) and a reverse mounting area (3) formed at its two ends respectively; The anti-backflow component (4) includes an annular fixing seat (5) circumferentially fixed inside a hollow tubular structure. The side of the annular fixing seat (5) near the reverse installation area (3) is connected to one end of a movable stop (6). The movable stop (6) is located between the annular fixing seat (5) and the reverse installation area (3). When the pressure in the reverse installation area (3) is lower than that in the forward installation area (2), the movable stop (6) moves to open the inner circle of the annular fixing seat (5) and connect it to the drainage channel (7). When the pressure in the reverse installation area (3) is higher than or equal to that in the forward installation area (2), the movable stop (6) moves to reset and closes the opening (8) formed by the inner circle of the annular fixing seat (5).

2. The negative pressure drainage device for preventing backflow according to claim 1, characterized in that: The annular fixing seat (5) includes a mounting part (9) and a guide part (10) integrally formed with the mounting part (9). The guide part (10) is close to the forward mounting area (2), and the mounting part (9) is close to the reverse mounting area (3) and is used to connect one end of the movable stop (6). The guide part (10) is a smooth transition position from the inner wall surface of the mounting body (1) to one side surface of the mounting part (9). The inner surface of the guide part (10) is connected to the inner circular surface of the mounting part (9).

3. The negative pressure drainage device for preventing backflow according to claim 1, characterized in that: The movable stop (6) includes a funnel-shaped liquid inlet (11) and a movable switch (12) communicating with the funnel-shaped liquid inlet (11). The larger end of the liquid inlet (11) is fixedly connected to one side of the annular fixed seat (5), and the smaller end of the liquid inlet (11) is integrally formed with one end of the movable switch (12). The movable switch (12) includes a first movable silicone sheet (13) and a second movable silicone sheet (14). The two sides of the first movable silicone sheet (13) are integrally formed with the two sides of the second movable silicone sheet (14), and the inner surfaces of the first movable silicone sheet (13) and the second movable silicone sheet (14) are in contact.

4. The negative pressure drainage device for preventing backflow according to claim 1, characterized in that: The movable stop (6) is a conical structure formed by the contact of the sidewall surfaces of at least four movable silicone baffles (15). The bottom of all movable silicone baffles (15) is integrally formed into a circle. The bottom of the movable silicone baffles (15) is fixedly connected to the annular fixing seat (5), and the other end extends toward the reverse installation area (3).

5. The negative pressure drainage device for preventing backflow according to claim 4, characterized in that: Each of the movable silicone baffles (15) extends from the top away from the bottom to form a silicone extension section (16), and the inner surfaces of the silicone extension sections (16) are in contact when the tops of all the movable silicone baffles (15) are closed.

6. The negative pressure drainage device for preventing backflow according to claim 1, characterized in that: The movable stop (6) includes a circular movable silicone baffle (17). The surface of the circular movable silicone baffle (17) is formed with a strip support (18) that divides it into two semicircles. The two ends of the support (18) are fixed to the side surface of the annular fixing seat (5) near the reverse installation area (3). The side of the annular fixing seat (5) near the reverse installation area (3) forms a limiting area (19). The edge of the circular movable silicone baffle (17) covers the limiting area (19).

7. The negative pressure drainage device for preventing backflow according to claim 1, characterized in that: The forward installation area (2) is set as the input end (20) of the drainage fluid, and the reverse installation area (3) is set as the connection end (21) of the negative pressure device.

8. The negative pressure drainage device for preventing backflow according to claim 7, characterized in that: The annular fixing seat (5) is located within the mounting body (1) near the forward mounting area (2).

9. The negative pressure drainage device for preventing backflow according to claim 1, characterized in that: The forward installation area (2) and the reverse installation area (3) are respectively set as the connection ends (21) for connecting the drainage pipe and the negative pressure device.

10. The negative pressure drainage device for preventing backflow according to claim 1, characterized in that: The mounting body (1) is transparent.

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