Negative pressure siphon drainage system and working method thereof

Abstract

The invention discloses a negative pressure siphon drainage system and a working method.The negative pressure siphon drainage system comprises a water storage container, a drainage pipe, a plugging piece, a valve rod, a lower floating body, a hard connecting rod and an upper floating body, a siphon drainage opening is formed in the inner side of the water storage container, and the drainage pipe is arranged on the outer side of the water storage container and communicated with the siphon drainage opening; one end of the valve rod is connected with the plugging piece, the lower floating body is arranged on the valve rod, the upper floating body is arranged above the lower floating body, the top end of the hard connecting rod is connected with the upper floating body, and the bottom end of the hard connecting rod is connected with the valve rod or the lower floating body; the water storage container is provided with a first critical liquid level completely submerging the lower floating body and a second critical liquid level starting to submerge the upper floating body. Internal and external power sources and air source driving are not needed, opening and closing of the valve are controlled by combining downward pressure, upward buoyancy and the torque of negative pressure suction in a negative pressure pipe network, and the opening and closing mode is endogenous mechanical driving.

Description

Technical Field

[0001] The present invention belongs to the technical field of drainage equipment, and in particular relates to a negative pressure siphon drainage system and a working method thereof. Background Art

[0002] Currently, non-gravity drainage methods include vacuum (negative pressure) drainage and positive pressure drainage. The water supply of vacuum (negative pressure) drainage technology is through a large amount of air intake in the pipeline network, and the water is transported by a large amount of air. The pipeline needs to be arranged in a zigzag shape to facilitate air lift water supply. Its technical advantage lies in its long water supply distance. It is used in high-speed rail, subway, indoor drainage, and outdoor drainage.

[0003] Although vacuum (negative pressure) drainage technology is used outdoors, it is difficult to popularize and promote due to its difficult construction, operation and maintenance management. The main reasons are as follows:

[0004] ① The vacuum well requires external / internal power and gas sources to drive. The conditions for connecting electricity and gas outdoors are limited and difficult to implement. The internal power supply requires regular replacement of batteries or solar panels, resulting in excessively high subsequent operation and maintenance costs.

[0005] ② The single water delivery volume of the vacuum well is small, about 6 to 12L each time. Each well discharges 500L of water per day, and is started and stopped 40 to 80 times a day. Due to its complex structure and control, frequent starts and stops will lead to more faults during operation.

[0006] ③ Due to frequent startup, the vacuum interface valve needs to be replaced every 6 to 12 months, resulting in high personnel and consumable costs.

[0007] Vacuum drainage is more convenient for indoor projects because it is easy to connect to power and gas sources. Subsequent operation and maintenance management requires special expenses and special personnel, so it is better for indoor vacuum drainage. However, it is difficult to meet these conditions for outdoor projects, so it is difficult to promote it on a large scale. It can only be well implemented in areas with better economic and technical conditions such as ancient towns.

[0008] In addition, the existing vacuum drainage technology uses a vacuum interface valve, which requires power or gas source to open and close. It is complex to operate, has a high frequency of opening, and is prone to failure. Subsequent operation and maintenance require professional personnel to perform maintenance, and the interface valve needs to be replaced from time to time. The system's operation and maintenance management personnel have a high degree of technical specialization; equipment maintenance is difficult; and the cost of regular consumable replacement is high. When the vacuum drainage system is in operation, a large amount of air is required to drive the water. When the water is transported, the air-to-water ratio is usually 5:1 to 20:1. The vacuum pump needs to discharge the large amount of air that enters the pipe network, resulting in high energy consumption per ton of water in the system and a large amount of odor outside the station. Summary of the invention

[0009] The object of the present invention is to provide a negative pressure siphon drainage system and a working method thereof, so as to solve the above-mentioned problems existing in the prior art.

[0010] In order to achieve the above-mentioned purpose, on the one hand, the present invention adopts the following technical scheme: a negative pressure siphon drainage system, comprising a water storage container, a drain pipe, a plugging member, a valve stem, a lower float, a hard connecting rod and an upper float, wherein a siphon drain port is arranged on the inner side of the water storage container, the drain pipe is arranged on the outer side of the water storage container and is connected with the siphon drain port, the plugging member is rotatably arranged on the siphon drain port, one end of the valve stem is connected to the plugging member, the lower float is arranged on the valve stem, the upper float is arranged above the lower float, the top end of the hard connecting rod is connected to the upper float, and the bottom end of the hard connecting rod is connected to the valve stem or the lower float. The water storage container is connected to a body; the water storage container is provided with a first critical liquid level for completely submerging the lower floating body and a second critical liquid level for starting to submerge the upper floating body; when the liquid level of the water storage container is lower than the first critical liquid level, the downward pressure on the blocking member is greater than the upward buoyancy so that the blocking member blocks the siphon drain outlet; when the liquid level of the water storage container is between the first critical liquid level and the second critical liquid level, the downward pressure on the blocking member is balanced with the upward buoyancy so that the position of the blocking member and the siphon drain outlet is maintained; when the liquid level of the water storage container is higher than the second critical liquid level, the downward pressure on the blocking member is less than the upward buoyancy so that the blocking member opens the siphon drain outlet.

[0011] As an optional implementation of the above technical solution, the water storage container is provided with a pipe joint, and the drain pipe is detachably connected to the pipe joint.

[0012] As an optional implementation of the above technical solution, the blocking member includes a blocking plate, and the blocking plate is rotatably arranged on the siphon drain outlet.

[0013] As an optional implementation of the above technical solution, a connecting ear plate is provided on the siphon drain outlet, and the blocking plate is connected to a rotating handle, and the rotating handle is rotatably connected to the connecting ear plate.

[0014] As an optional implementation of the above technical solution, the surface of the blocking plate is provided with a sealing strip or an arc-shaped sealing rubber head adapted to the siphon drain outlet.

[0015] As an optional implementation of the above technical solution, the siphon drain outlet is provided with a sealing ring.

[0016] As an optional implementation of the above technical solution, a plurality of intermediate floats are provided on the hard connecting rod.

[0017] The floating body comprises a floating ball, and the bottom of the floating ball is connected to a hard connecting rod.

[0018] As an optional implementation of the above technical solution, the lower floating body includes a lower floating ball, and the top of the lower floating ball is connected to a hard connecting rod.

[0019] As an optional implementation of the above technical solution, the diameter of the upper floating ball is greater than the diameter of the lower floating ball.

[0020] As an optional implementation of the above technical solution, the upper floating ball and the lower floating ball are both made of plastic.

[0021] As an optional implementation of the above technical solution, the water storage container is a drainage well.

[0022] On the other hand, the present invention adopts the following technical solution: a working method of the above-mentioned negative pressure siphon drainage system, comprising:

[0023] Introducing liquid into the water storage container so that the liquid level in the water storage container gradually rises;

[0024] When the liquid level of the water storage container is lower than the first critical liquid level, the downward pressure on the plugging member is greater than the upward buoyancy so that the plugging member blocks the siphon drain outlet;

[0025] When the liquid level of the water storage container continues to increase and is between the first critical liquid level and the second critical liquid level, the downward pressure on the plugging member is balanced with the upward buoyancy, and the plugging member continues to block the siphon drain outlet;

[0026] When the liquid level in the water storage container continues to increase and exceeds the second critical liquid level, the downward pressure on the plugging member is less than the upward buoyancy, and the valve stem drives the plugging member to rotate, so that the plugging member opens the siphon drain port, and the liquid level in the water storage container gradually decreases;

[0027] When the liquid level of the water storage container gradually decreases and is between the second critical liquid level and the first critical liquid level, the downward pressure on the plugging member is balanced with the upward buoyancy, and the plugging member continues to open the siphon drain port;

[0028] When the liquid level of the water storage container continues to decrease and is lower than the first critical liquid level, the downward pressure on the blocking member is greater than the upward buoyancy, and under the negative pressure siphon effect of the siphon drain outlet, the blocking member blocks the siphon drain outlet.

[0029] The beneficial effects of the present invention are:

[0030] The present invention does not require internal or external power supply or air source drive, and combines the downward pressure, upward buoyancy and the torque of the negative pressure suction in the negative pressure pipe network to control the opening and closing of the valve, and its opening and closing mode is endogenous mechanical drive. The structural design of the present invention is ingenious, and it fully utilizes the torque changes of the buoyancy, gravity and negative pressure suction of the water storage container at different liquid levels to realize automatic opening and closing of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a first structural schematic diagram of a negative pressure siphon drainage system provided by the present invention;

[0032] Figure 2 It is a second structural schematic diagram of a negative pressure siphon drainage system provided by the present invention;

[0033] Figure 3 It is a third structural schematic diagram of a negative pressure siphon drainage system provided by the present invention;

[0034] Figure 4 This is a working state diagram of a negative pressure siphon drainage system provided by the present invention.

[0035] In the figure: 1-valve stem; 2-lower float; 3-hard connecting rod; 4-upper float; 5-siphon drain outlet; 6-first critical liquid level; 7-second critical liquid level; 8-middle float; 9-sealing plate; 10-sealing ring; 11-rotating handle; 12-drain pipe; 13-pipe joint; 14-connecting ear plate; 15-arc-shaped sealing rubber head; 16-fixed seat. DETAILED DESCRIPTION

[0036] like Figure 1-Figure 4 As shown, this embodiment provides a negative pressure siphon drainage system, including a water storage container, a drain pipe 12, a plugging member, a valve stem 1, a lower float 2, a hard connecting rod 3 and an upper float 4. The water storage container adopts a drainage well, and a siphon drain port 5 is provided on the inner side of the water storage container. The siphon drain port 5 is arranged at the bottom of the water storage container. The siphon drain port 5 can be designed to face upward or downward, and the angle range of the setting is 360 degrees to meet different use conditions. The drain pipe 12 is arranged on the outside of the water storage container and is connected to the siphon drain port 5. The drain pipe 12 is connected to the negative pressure pipe network, so that the liquid in the water storage container can enter the drain pipe 12 through the siphon drain port 5 and be transported to the negative pressure pipe network. The plugging member is rotatably arranged on the siphon drain port 5, and the plugging member acts as a valve to control the switch of the siphon drain port 5.

[0037] One end of the valve stem 1 is connected to the plugging member, the lower float 2 is arranged on the valve stem 1, the upper float 4 is arranged above the lower float 2, the top end of the hard connecting rod 3 is connected to the upper float 4, and the bottom end of the hard connecting rod 3 is connected to the valve stem 1 or the lower float 2. Usually, the lower float 2 is fixed on the valve stem 1, and the two ends of the hard connecting rod 3 are respectively fixedly connected to the upper float 4 and the valve stem 1. When the upper float 4 moves, it can drive the valve stem 1 to rotate, so as to realize the function of the plugging member to open or close the siphon drain port 5. The length of the valve stem 1 determines the size of the lower float 2 and the upper float 4. The longer the valve stem 1 is, the smaller the buoyancy required by the plugging member for the same torque is, and the smaller the volume of the upper float 4 is. Conversely, the shorter the valve stem 1 is, the larger the volume of the upper float 4 is.

[0038] like Figure 1As shown, the water storage container is provided with a first critical liquid level 6 for completely submerging the lower float 2 and a second critical liquid level 7 for beginning to submerge the upper float 4. After the sealing member closes the siphon drain port 5, liquid is introduced into the water storage container to gradually raise the liquid level of the water storage container. When the liquid level rises to the point where the lower float 2 is just completely submerged, the first critical liquid level 6 at which the liquid completely submerges the lower float 2 is reached; liquid continues to be introduced into the water storage container to raise the liquid level of the water storage container. When the liquid level rises to the point where it contacts the bottom of the upper float 4, the second critical liquid level 7 at which the liquid begins to submerge the upper float 4 is reached.

[0039] The height difference between the first critical liquid level 6 and the second critical liquid level 7 is the buffer section. In the buffer section, the moment of force on the plugging part is constant and unchanged. The height of the buffer section is the key to controlling the overall start-up liquid level and determines the amount of water discharged at a single time. If the buffer section is low, the amount of water discharged at a single time is small, and if the buffer section is high, the amount of water discharged at a single time is large. Figure 2 As shown, n intermediate buoys 8 may also be arranged between the buffer sections, and the upper and lower parts of each intermediate buoy 8 form a small intermediate buffer section, forming an (n-1) intermediate buffer section as a whole.

[0040] During the process of introducing liquid, the valve stem 1, the lower float 2, the hard connecting rod 3 and the upper float 4 will generate a downward pressure on the plugging part due to their own weight, and the lower float 2 and the upper float 4 will generate an upward buoyancy on the plugging part due to the buoyancy of the liquid. According to the changes of the downward pressure and the lower float 2, the plugging part controls the opening and closing of the siphon drain 5. When the liquid level of the water storage container is lower than the first critical liquid level 6, the downward pressure on the plugging part is greater than the upward buoyancy so that the plugging part blocks the siphon drain 5; when the liquid level of the water storage container is between the first critical liquid level 6 and the second critical liquid level 7, the downward pressure on the plugging part and the upward buoyancy are balanced so that the position of the plugging part and the siphon drain 5 is maintained; when the liquid level of the water storage container is higher than the second critical liquid level 7, the downward pressure on the plugging part is less than the upward buoyancy so that the plugging part opens the siphon drain 5.

[0041] When the liquid level in the water storage container is low (lower than the first critical liquid level 6), the valve is in a closed state. As the liquid level rises, when the liquid level in the water storage container is between the first critical liquid level 6 and the second critical liquid level 7, the downward pressure on the plugging member and the upward buoyancy are balanced, and the valve is still in a closed state. When the liquid level reaches a high level (higher than the second critical liquid level 7), the balance between the downward pressure and the upward buoyancy on the plugging member is broken, and the valve opens instantly at the moment of breaking the balance. At this time, since the valve opening angle is small, the liquid introduction speed is greater than the drainage speed of the siphon drain port 5, and the liquid level in the water storage container continues to increase, the valve opening angle increases, and the liquid is discharged quickly; as the liquid level drops, when the liquid level drops to between the first critical liquid level 6 and the second critical liquid level 7, the downward pressure on the plugging member and the upward buoyancy are balanced, and the valve is still in an open state; when the liquid level continues to drop to below the first critical liquid level 6, the downward pressure on the plugging member is greater than the upward buoyancy, and under the negative pressure siphon action of the siphon drain port 5, the valve closes immediately. The whole process is repeated to ensure the stable operation of the negative pressure siphon drainage system.

[0042] The negative pressure siphon drainage system of the present invention does not require internal or external power supply or air source drive. It combines the downward pressure, upward buoyancy and the torque of the negative pressure suction in the negative pressure pipe network to control the opening and closing of the valve, and its opening and closing mode is endogenous mechanical drive. The structural design of the present invention is ingenious, and it fully utilizes the torque changes of the buoyancy, gravity and negative pressure suction of the water storage container at different liquid levels to realize automatic opening and closing of the valve.

[0043] In this embodiment, the water storage container is provided with a pipe joint 13, and the drain pipe 12 is detachably connected to the pipe joint 13. The blocking member includes a blocking plate 9, and the blocking plate 9 is rotatably arranged on the siphon drain outlet 5. The siphon drain outlet 5 is provided with a connecting ear plate 14, and the blocking plate 9 is fixedly connected with a rotating handle 11, and the rotating handle 11 is rotatably connected to the connecting ear plate 14. The connecting ear plate 14 provides a fulcrum for the rotating handle 11 to realize the rotation function of the blocking plate 9, thereby controlling the switch of the siphon drain outlet 5. A fixing seat 16 is provided in the water storage container, and the siphon drain outlet 5 is located inside the fixing seat 16. The pipe joint 13 is fixed on the fixing seat 16 without any directional deviation.

[0044] In one embodiment, the upper float 4 includes an upper float ball, the bottom of which is connected to the hard connecting rod 3. The lower float 2 includes a lower float ball, the top of which is connected to the hard connecting rod 3. Preferably, the diameter of the upper float ball is greater than the diameter of the lower float ball. In order to ensure the buoyancy of the upper float ball and the lower float ball, the upper float ball and the lower float ball are both made of plastic.

[0045] like Figure 2As shown, in this embodiment, the surface of the sealing plate 9 is provided with a sealing strip or an arc-shaped sealing rubber head 15 adapted to the siphon drain outlet 5, and the siphon drain outlet 5 is provided with a sealing ring to improve the sealing effect between the sealing plate 9 and the siphon drain outlet 5.

[0046] The core of the present invention: 1) The equipment is a mechanical structure, which is not easy to be damaged or fail. 2) Automatic opening and closing of the valve - instant opening and instant closing. Automatic opening and closing is achieved by the difference of all its buoyancy, gravity and suction torque at different liquid level heights. When the liquid level in the drainage well changes from low liquid level to high liquid level, the counterclockwise buoyancy torque gradually increases, and when it is equal to the clockwise gravity and negative pressure suction torque, it reaches a balance, the liquid level continues to rise, the balance is destroyed, and the valve opens instantly; when the high liquid level changes to the low liquid level, the counterclockwise buoyancy torque becomes the minimum, which is much smaller than the sum of the clockwise negative pressure suction torque and the torque generated by the self-weight of the valve stem 1, the lower float 2, the hard connecting rod 3 and the upper float 4, and the valve is closed at this time. 3) The drainage water volume is controlled by controlling the size, number and distance between the lower float 2 and the upper float 4, and the single maximum drainage volume of the drainage well is increased by increasing the height of the buffer section, and the number of drainage times is reduced, thereby reducing the number of equipment failures and maintenance frequency.

[0047] like Figure 4 As shown, this embodiment also provides a working method of the negative pressure siphon drainage system, including:

[0048] S1, introducing liquid into the water storage container so that the liquid level of the water storage container gradually rises;

[0049] S2, when the liquid level of the water storage container is lower than the first critical liquid level 6, the downward pressure on the valve is greater than the upward buoyancy so that the valve blocks the siphon drain port 5;

[0050] S3, when the liquid level of the water storage container continues to increase and is between the first critical liquid level 6 and the second critical liquid level 7, the downward pressure on the valve is balanced with the upward buoyancy, and the valve continues to block the siphon drain port 5;

[0051] S4, when the liquid level in the water storage container continues to increase and is higher than the second critical liquid level 7, the downward pressure on the valve is less than the upward buoyancy, the valve stem 1 drives the valve to rotate, so that the valve opens the siphon drain port 5, and the liquid level in the water storage container gradually decreases;

[0052] S5, when the liquid level of the water storage container gradually decreases and is between the second critical liquid level 7 and the first critical liquid level 6, the downward pressure on the valve is balanced with the upward buoyancy, and the valve continues to open the siphon drain port 5;

[0053] S6, when the liquid level of the water storage container continues to decrease and is lower than the first critical liquid level 6, the downward pressure on the valve is greater than the upward buoyancy, and under the negative pressure siphon effect of the siphon drain outlet 5, the valve blocks the siphon drain outlet 5.

[0054] The present invention adopts negative pressure siphon technology, which is basically the same as vacuum (negative pressure) drainage technology in terms of negative pressure station power equipment, but there are differences in water delivery methods and principles. Vacuum (negative pressure) drainage adopts an air intake water delivery method, that is, a small amount of water is driven by a large amount of air. The negative pressure siphon drainage of the present invention adopts a negative pressure siphon water delivery method without air intake. Vacuum drainage is: after the vacuum valve is opened, air and water enter the vacuum pipe network at the same time, and negative pressure siphon drainage is: after the valve is opened, the siphon drainage port 5 is always controlled below the liquid level, and no air will enter the pipe network.

[0055] Compared with vacuum drainage, the present invention has the following advantages:

[0056] ① It solves the problem of external power supply and gas source for vacuum well. The opening and closing of negative pressure siphon valve adopts pure mechanical drive, and no external power supply and gas source are required.

[0057] ② The high failure rate of vacuum wells has been solved. First, the negative pressure siphon valve is a purely mechanical structure with a stable structure and is not prone to failure. Secondly, the single water delivery volume is large, and the daily opening frequency is reduced to 1 to 3 times, which greatly reduces the annual failure rate of the negative pressure siphon well, making the system more stable and easier to manage.

[0058] ③ Solved the problem of needing to replace consumables. The negative pressure siphon valve structure is a purely mechanical structure with basically no consumables, and can be used for more than 10 years under normal conditions.

[0059] ④ Solved the problem of high energy consumption. When the negative pressure siphon drainage system delivers water, no air enters the pipe network. When the system vacuum pump is running, it only needs to discharge a small amount of air released from the sewage under negative pressure into the pipe network. The energy consumption per ton of water of the negative pressure siphon drainage system is only 5% to 10% of the energy consumption per ton of water of the vacuum drainage system.

[0060] The negative pressure siphon drainage system of the present invention has high stability. The valve opening and closing is driven by endogenous buoyancy, and does not require any external (internal) power supply or air source drive. It has a simple structure, a large opening and closing liquid level difference, a low opening frequency, few failures, and high stability. It can be repaired by ordinary workers, which is convenient for later maintenance. The burst adopts a non-air-intake water delivery method, and the water suction port is always below the sewage liquid level. When the valve in the drainage well is opened, the sewage is quickly transported to the negative pressure siphon pipe and the negative pressure tank under the action of the negative pressure siphon in the negative pressure pipe network, and then discharged to the municipal sewage pipe network or the terminal sewage treatment facility through a dry sewage pump. The energy consumption of the negative pressure siphon drainage system is 10% to 20% of the energy consumption of the vacuum drainage system, which greatly reduces the energy consumption of water delivery.

[0061] In the description of the present invention, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, and may be fixedly connected, detachably connected, or integrated; may be mechanically connected or electrically connected; may be directly connected or indirectly connected through an intermediate medium, may be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood. In addition, the specific features, structures, etc. described in the embodiments are included in at least one embodiment. Under the condition that there is no contradiction, those skilled in the art may combine the features of different embodiments. The protection scope of the present invention is not limited to the above-mentioned specific embodiments. According to the basic technical concept of the present invention, the embodiments that can be associated with by ordinary technicians in this field without creative work all belong to the protection scope of the present invention.

Claims

1. A negative pressure siphon drainage system, characterized in that: The utility model comprises a water storage container, a drainage pipe (12), a plugging member, a valve stem (1), a lower floating body (2), a hard connecting rod (3) and an upper floating body (4); a siphon drainage port (5) is arranged on the inner side of the water storage container; the drainage pipe (12) is arranged on the outer side of the water storage container and is connected to the siphon drainage port (5); the plugging member is rotatably arranged on the siphon drainage port (5); one end of the valve stem (1) is connected to the plugging member; the lower floating body (2) is arranged on the valve stem (1); the upper floating body (4) is arranged above the lower floating body (2); the top end of the hard connecting rod (3) is connected to the upper floating body (4); the bottom end of the hard connecting rod (3) is connected to the valve stem (1) or the lower floating body (2); The water storage container is provided with a first critical liquid level (6) for completely submerging the lower float (2) and a second critical liquid level (7) for starting to submerge the upper float (4); when the liquid level of the water storage container is lower than the first critical liquid level (6), the downward pressure on the plugging member is greater than the upward buoyancy, so that the plugging member blocks the siphon drain outlet (5); when the liquid level of the water storage container is between the first critical liquid level (6) and the second critical liquid level (7), the downward pressure on the plugging member and the upward buoyancy are balanced, so that the position of the plugging member and the siphon drain outlet (5) is maintained; when the liquid level of the water storage container is higher than the second critical liquid level (7), the downward pressure on the plugging member is less than the upward buoyancy, so that the plugging member opens the siphon drain outlet (5).

2. The negative pressure siphon drainage system according to claim 1, characterized in that: The water storage container is provided with a pipe joint (13), and the drainage pipe (12) is detachably connected to the pipe joint (13).

3. The negative pressure siphon drainage system according to claim 1, characterized in that: The blocking member comprises a blocking plate (9), and the blocking plate (9) is rotatably arranged on the siphon drain outlet (5).

4. The negative pressure siphon drainage system according to claim 3, characterized in that: The siphon drain outlet (5) is provided with a connecting ear plate (14), the blocking plate (9) is connected with a rotating handle (11), and the rotating handle (11) is rotatably connected to the connecting ear plate (14); the siphon drain outlet (5) is provided with a sealing ring (10).

5. The negative pressure siphon drainage system according to claim 3, characterized in that: The surface of the blocking plate (9) is provided with a sealing strip or an arc-shaped sealing rubber head (15) adapted to the siphon drain outlet (5).

6. The negative pressure siphon drainage system according to claim 1, characterized in that: A plurality of intermediate floats (8) are provided on the hard connecting rod (3).

7. The negative pressure siphon drainage system according to claim 1, characterized in that: The upper floating body (4) comprises an upper floating ball, the bottom of which is connected to a hard connecting rod (3); the lower floating body (2) comprises a lower floating ball, the top of which is connected to the hard connecting rod (3).

8. The negative pressure siphon drainage system according to claim 7, characterized in that: The diameter of the upper floating ball is greater than that of the lower floating ball; and both the upper floating ball and the lower floating ball are made of plastic.

9. The negative pressure siphon drainage system according to claim 1, characterized in that: The water storage container is a drainage well.

10. A method for operating a negative pressure siphon drainage system according to any one of claims 1 to 9, characterized in that: include: Introducing liquid into the water storage container so that the liquid level in the water storage container gradually rises; When the liquid level of the water storage container is lower than the first critical liquid level (6), the downward pressure on the blocking member is greater than the upward buoyancy, so that the blocking member blocks the siphon drain outlet (5); When the liquid level of the water storage container continues to increase and is between the first critical liquid level (6) and the second critical liquid level (7), the downward pressure on the plugging member and the upward buoyancy are balanced, and the plugging member continues to block the siphon drain outlet (5); When the liquid level in the water storage container continues to increase and exceeds the second critical liquid level (7), the downward pressure on the plugging member is less than the upward buoyancy, and the valve stem (1) drives the plugging member to rotate, so that the plugging member opens the siphon drain port (5), and the liquid level in the water storage container gradually decreases; When the liquid level of the water storage container gradually decreases and is between the second critical liquid level (7) and the first critical liquid level (6), the downward pressure on the plugging member and the upward buoyancy are balanced, and the plugging member continues to open the siphon drain port (5); When the liquid level in the water storage container continues to decrease and falls below the first critical liquid level (6), the downward pressure on the blocking member is greater than the upward buoyancy, and under the negative pressure siphoning action of the siphon drain outlet (5), the blocking member blocks the siphon drain outlet (5).

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