CN117661699A - Stable, reliable and adjustable single- and double-phase flow negative pressure sewage collection wells and systems - Google Patents

Abstract

The invention discloses a stable, reliable and adjustable single- and double-phase flow negative pressure sewage collection well and system. The collection well includes a casing equipped with a water inlet and connected with a negative pressure suction pipe. The negative pressure suction pipe is at the bottom of the casing. Forming a water outlet suction port; the plugging assembly includes a plugging head and an isolation cover, forming a gas-liquid mixing space between the two; a plugging drive assembly that drives the plugging assembly to block or open the water outlet suction port according to the liquid level; used to adjust the plugging The plug position adjustment component is used to adjust the distance between the effective sealing surface of the head and the opening plane of the isolation cover; and the air flux adjustment component is used to adjust the air flow between the gas-liquid mixing space and the external atmospheric environment. By configuring an isolation cover on the plugging head to form a gas-liquid mixing space, during the negative pressure suction process, the gas flux between the gas-liquid mixing space and the external atmospheric environment is changed, and the relative position between the plugging head and the isolation cover is achieved. The adjustment of the gas-liquid mixing ratio in the negative pressure suction pipe has a simple structure, high reliability, stable operation and easy maintenance.

Description

Stable, reliable and adjustable single- and double-phase flow negative pressure sewage collection wells and systems

Technical field

The invention relates to the technical field of sewage treatment devices, and more specifically, to a stable, reliable and adjustable single- and double-phase flow negative pressure sewage collection well and system.

Background technique

Before sewage treatment, sewage needs to be collected. Especially for some application scenarios where the sources of sewage are relatively scattered, such as rural domestic sewage treatment, etc., the sewage from each household needs to be collected and transmitted uniformly. During this process, negative pressure Sewage collection systems are widely used due to their advantages of high efficiency, convenience and flexible control.

Negative pressure sewage collection systems usually include a vacuum pump station for providing negative pressure, and negative pressure sewage collection wells scattered within a certain range. A single negative pressure sewage collection well can be connected to the sewage pipes or sewage temporary storage wells of multiple households. Pass. When in use, the vacuum pumping station pumps the sewage in the negative pressure sewage collection well into the vacuum tank of the pumping station through the negative pressure pipeline, and then transports it through the pipeline to sewage treatment equipment, such as biochemical sewage treatment tanks, etc. for unified treatment.

Negative pressure sewage collection wells are usually equipped with a liquid level detection device and a switch that opens and closes the negative pressure pipe according to the liquid level. The above-mentioned liquid level detection device is usually configured as an electronic float level gauge, and the switch is usually configured as a negative pressure (vacuum) interface valve. When the sewage liquid level in the negative pressure sewage collection well exceeds the first set value, the above-mentioned vacuum The interface valve opens, and the sewage is pumped away along the negative pressure pipeline. After a period of suction, the liquid level drops to the second set value, and the vacuum interface valve is closed. At this time, the suction of sewage stops, and the cycle repeats.

Usually during the sewage pumping process, some air is appropriately sucked into the negative pressure pipeline, that is, the sewage transmission pipeline, according to the length, cross-sectional area and other characteristics of the pipeline, and the original single-phase liquid flow is converted into a two-phase gas-liquid mixture. flow, which can effectively improve the efficiency of sewage transmission and prevent sewage from being blocked during the transmission process.

In practice, the inventor found that the current negative pressure sewage collection wells still have many disadvantages when used. For example, the traditional vacuum interface valve mainly includes a spring and a diaphragm, such as a vacuum interface valve disclosed in patent application number CN214367764U. When the gas-liquid mixing ratio in the negative pressure pipeline is 10, and the DN50 vacuum interface valve transports 10L of sewage, its built-in spring needs to be compressed and reset about 20 times. Due to mechanical fatigue, the service life of the spring is drastically shortened, and the diaphragm itself is also prone to rupture. Frequent maintenance and replacement are required; secondly, because corrosive gas or gas-liquid mixture is usually diffused in negative pressure sewage collection wells, the failure rate of precision devices configured in them, such as electronic float level gauges, soars; finally, when sewage is collected, The gas-liquid mixing ratio in the negative pressure pipeline is fixed and cannot be well adapted to different demand scenarios.

Contents of the invention

In view of the problems in practical application that negative pressure sewage collection wells have a high failure rate, low reliability and are difficult to maintain, and the gas-liquid mixing ratio in negative pressure pipelines is also difficult to adjust. The first purpose of this application is to propose a stable, reliable and adjustable single- and dual-phase The negative pressure sewage collection well can eliminate the complex and sophisticated electronic or mechanical components in the negative pressure sewage collection well, realize the collection of negative pressure sewage and at the same time adjust the gas-liquid mixing ratio in the negative pressure pipeline, and has high reliability, It has the characteristics of high stability, easy maintenance and wide application range. Based on the above-mentioned negative pressure sewage collection well, the second purpose of this application is to propose a stable, reliable and adjustable single- and double-phase flow negative pressure sewage collection system. The specific plan is as follows:

A stable, reliable and adjustable single- and double-phase flow negative pressure sewage collection well, including:

The shell is equipped with a water collection space inside and is provided with a water inlet. The water collection space is connected with a negative pressure suction pipe, and the negative pressure suction pipe forms a water outlet suction port in the water collection space;

The blocking assembly is arranged above the water outlet suction port, and includes a blocking head for blocking the water outlet suction port and an isolation cover arranged above the blocking head. A gas-liquid gap is formed between the isolation cover and the blocking head. mixed space;

A blocking drive component configured to drive the blocking component toward or away from the water outlet suction port according to the liquid level in the water collection space to block or open the water outlet suction port;

A plug position adjustment component configured to adjust the vertical distance between the effective plugging surface of the plugging head and the opening plane of the isolation cover; and

An air flux adjustment component configured to adjust the air flow between the gas-liquid mixing space and the external atmospheric environment;

Wherein, when the liquid level in the water collecting space gradually rises and is higher than the first set value, the blocking driving component drives the blocking component away from the water outlet and starts negative pressure suction;

When the liquid level in the water collection space gradually decreases and is lower than the second set value, the blocking head in the blocking assembly blocks the water outlet suction port.

Through the above technical solution, when the blocking component is driven by the blocking driving component to move toward the water outlet suction port to block the water outlet suction port, when the effective blocking surface of the blocking head is located outside the opening of the isolation cover, the blocking head first Since the isolation cover is in contact with the water outlet, the negative pressure suction pipe is always in liquid phase flow during the shutdown process, that is, no air enters the negative pressure suction pipe; when the effective blocking surface of the blocking head is located inside the opening of the isolation cover When the system is closed, the opening of the isolation cover comes into contact with the water outlet before the blocking head. During the shutdown process, part of the air mixed with sewage will enter the negative pressure suction pipe to achieve the effect of gas-liquid two-phase mixed flow. By changing the relative distance between the blocking head and the opening plane of the isolation cover, and/or the size of the gas-liquid mixing space and the air flux of the external atmospheric environment, the gas-liquid mixing ratio in the negative pressure suction pipe can be flexibly and conveniently adjusted. , for example, when the plug is far away from the opening of the isolation cover and the gas flux between the gas-liquid mixing space and the external atmospheric environment is slightly smaller than the negative pressure suction gas flux of the negative pressure suction pipe, a large amount of gas will be sucked into the gas-liquid mixing space. At the same time, because the entire mixing space of the enterprise is under negative pressure, a small amount of sewage will also be sucked into the negative pressure suction pipe, thereby achieving a two-phase mixed flow with an ultra-high gas-liquid ratio. In the above scheme, only the gas flux between the gas-liquid mixing space and the external atmospheric environment and the relative position between the blocking head and the isolation cover need to be adjusted. The structure is simple, the adjustment is convenient, and the control effect is more reliable.

Further, the water outlet suction opening is arranged upward at the bottom of the water collection space, and the blocking drive assembly includes:

A floating body is floatingly arranged in the water collection space, fixedly connected to the blocking component, and rises and falls with the liquid level;

The driving limiter is configured to be fixedly connected to the housing and used to limit the movement direction of the floating body when it rises and falls with the liquid level;

Wherein, when the floating body is in the initial position, the blocking head presses against the water outlet;

When the liquid level in the water collection space rises to the first set value, the buoyancy force on the floating body is greater than the sum of the gravity of the floating body, the gravity of the plugging component and the suction force of the negative pressure suction pipe on the plugging head, and the floating body drives the The blocking head is separated from the water outlet and the negative pressure suction is started.

Through the above technical solution, the buoyancy force experienced by the floating body when the liquid level rises is used to drive the movement of the blocking component, and the water outlet suction port can be automatically blocked or opened according to the level of the liquid level. The structure is simple, stable and reliable. The driving limiter can be used to ensure that the blocking member reciprocates in the set direction, that is, toward or away from the water outlet, thereby preventing the lateral position of the blocking member from deviating relative to the water outlet during the movement and ensuring the sealing of the blocking member. Effect.

Further, the floating body is made of hollow floating balls or low-density materials;

The volume of the floating body gradually increases from bottom to top; or

The top and bottom volumes of the floating body are larger than the middle volume; or

The floating body includes an upper floating body and a lower floating body, and the upper floating body and the lower floating body are fixedly connected by a connecting piece at a set distance; or

The floating body includes a plurality of sub-floating bodies fixedly connected at a set distance through connectors, and each sub-floating body is arranged vertically.

Through the above technical solution, when the sewage level in the water collection space rises, the sewage will first submerge the floating body below. Since the floating body below is small, the upward buoyancy force received by the floating body at this time is not enough to offset the impact of the water outlet on the blocking head. Due to downward forces such as suction and the gravity of the floating body, the blocking head will still block the water outlet. As the liquid level rises, the volume of the floating body submerged by sewage also gradually increases. When the liquid level rises above the first set value, the upward buoyancy force received by the floating body is greater than the downward force it receives. Drive the blocking component to rise. Since the middle part of the floating body is small or arranged in multiple sections, when the liquid level continues to rise after submerging the bottom floating body, the buoyancy force on the entire floating body will not increase sharply, which can allow the sewage stock in the water collection space to exceed the set value. The negative pressure suction will be started only after the value is reached, thereby avoiding the high-frequency repeated blocking of the water suction port by the blocking component, reducing the noise of the negative pressure sewage collection well, and extending the service life of the blocking component.

Further, the driving limiter includes:

A guide limiting rod is configured as at least one, at least one end is fixedly connected to the inner wall of the housing, at least one section of the rod is provided along the opening direction of the water outlet and penetrates the floating body, and the floating body is slidably provided on the guide limiting rod. on; or

The guide limiting cylinder includes a cylinder arranged along the direction of the opening of the water outlet suction port. At least one end of the cylinder is fixedly connected to the inner wall of the housing. The side wall or bottom opening of the cylinder is equipped with an inlet for sewage to enter the cylinder. Water hole, the cross-sectional shape of the floating body matches the cross-sectional shape of the cylinder, and is slidably sleeved in the cylinder.

Through the above technical solution, the movement direction of the floating body can be restricted to prevent the position of the plugging head from shifting when blocking the water outlet, thus ensuring the plugging effect.

Furthermore, the top end of the guide limit rod is fixedly arranged on the inner wall of the housing through a built-in mounting flange. The guide rod is configured as a straight rod as a whole, or a section provided along the direction of the water outlet opening is obtained by bending. The free end faces and is close to the water outlet.

Through the above technical solution, the installation and disassembly of the floating body are very convenient, and the manufacturing cost of the negative pressure sewage collection well can be reduced as a whole.

Further, the bottom of the housing is recessed inward to form a first base for locking the cylinder, or a second base for locking the cylinder is fixedly installed on the bottom wall of the housing;

The water inlet hole is provided on the side wall of the cylinder or is opened on the second base;

The barrel is equipped with a locking structure that is adapted to the first base or the second base.

Through the above technical solution, the position of the cylinder can be fixed to limit the movement direction of the floating body, ensuring that the blocking head can accurately block the water outlet.

Further, the opening direction of the water outlet suction port is set vertically upward, and the opening is configured in a trumpet shape;

The guide limit rod or the guide limit cylinder is arranged vertically, and the blocking head is arranged coaxially with the water outlet suction port;

The blocking head is configured in a spherical or truncated cone shape;

The sealing head is entirely made of rubber, or the inner core is made of hard material, and the surface is covered with a soft sealing layer.

Through the above technical solution, when the floating body moves up and down as the liquid level rises or falls, it can drive the blocking head to block the water outlet suction port, which is convenient and fast; the opening of the water outlet suction port is set in a trumpet shape, which can effectively guide the blocking head to block the water outlet. The water outlet suction port can self-correct even if there is a slight deviation in the position of the plugging head when blocking, without affecting the blocking effect.

Further, the isolation cover is cup-shaped with the opening facing downward, and the blocking head is arranged in the isolation cover through a connecting rod that penetrates the top of the isolation cover;

A section of the surface where the connecting rod is connected to the isolation cover is provided with threads, and the connecting rod is threadedly connected to the isolation cover;

The plug position adjustment assembly includes a screw handle for screwing the connecting rod and/or the isolation cover.

Through the above technical solution, only the connecting rod or the isolation cover needs to be screwed, and the relative positions of the two can be changed, making the adjustment simple and convenient.

Further, the air flux adjustment assembly includes an air inlet pipe, one end of the air inlet pipe away from the blocking assembly is opened above the floating body, and one end close to the blocking assembly passes through the isolation cover and the gas-liquid mixing space. connected;

The section of the air inlet pipe located above the floating body is provided with a regulating valve for adjusting its air flux.

Through the above technical solution, the air flow rate between the gas-liquid mixing space and the external atmospheric environment can be flexibly adjusted, thereby changing the gas-liquid mixing ratio in the pipeline when the negative pressure suction pipe is drained.

Further, a section of the negative pressure suction pipe close to the water outlet suction port is located at the bottom of the water collection space and is arranged vertically upward, and the suction port is folded to form or connected with a bell mouth;

The driving limiter includes a guide limiter cylinder fixed vertically in the water collection space, and the water outlet is located inside the guide limiter cylinder;

The floating body and the guide limiting cylinder are arranged to slide coaxially, and an airtight groove is provided at the bottom of the floating body along the axial direction of the guiding limiting cylinder, and the airtight groove forms an opening at the bottom of the floating body;

The isolation cover is configured as the floating body body, and the blocking head is connected and arranged in the air-tight groove through a connecting rod passed through the floating body, and forms the gas-liquid gap between the isolation cover and the air-tight groove. mixed space;

The floating body is provided with an air inlet channel connected to the gas-liquid mixing space. The air flux adjustment assembly includes an air inlet pipe. One end of the air inlet pipe extends above the floating body, and the other end is connected to the inlet pipe. The gas channel may be directly connected to the gas-liquid mixing space;

The plug position adjusting component is arranged between the floating body and the connecting rod.

Through the above technical solution, the floating body body is directly used to form an isolation cover, which simplifies the structure of the negative pressure sewage collection well. At the same time, the opening height set at the bottom of the floating body body and the position of the plug always follow the change of the liquid level in the water collection space, and the work is stable. Reliable, which does not involve precision electronic or mechanical components, high reliability and easy maintenance.

Further, a limiting structure or a limiting piece for preventing the floating body from rotating is provided between the floating body and the guide limiting cylinder;

The floating body is vertically provided with connecting channels;

The plug position adjustment assembly includes a connecting rod, a locking nut and a fixed nut fixed on the top of the floating body. One end of the connecting rod extends into the gas-liquid mixing space through the connecting channel and is fixedly connected to the plugging head, and the other end goes out to A screwing handle is provided on the top of the floating body. A section of side wall where the connecting rod is connected to the floating body is provided with threads that match the fixing nut. The connecting rod is threadedly connected to the floating body through the fixing nut.

Through the above technical solution, when it is necessary to adjust the relative position between the blocking head and the floating body, it is only necessary to twist the twisting handle, which is convenient, fast and structurally stable.

Further, the casing has a cup-shaped structure with a large bottom and a small top. The lower section of the casing is configured as the water collection space, the upper section is configured as the maintenance space, and a cover is provided at the opening of the casing;

At least one water inlet is provided on the side wall of the housing close to the maintenance space;

The negative pressure suction pipe passes through the maintenance space and enters the water collection space, and forms the water outlet suction port at the bottom of the water collection space;

A partition is detachably provided between the maintenance space and the water collection space;

The maintenance space is provided with monitoring devices for reflecting the working status of each component in the negative pressure sewage collection well.

Through the above technical solution, the shell of the negative pressure sewage collection well is arranged with a large upper part and a small lower part. After being buried underground, the position where it is squeezed by the soil layer is more stable. The position of the shell near the top is set as a maintenance space, which facilitates maintenance personnel to perform relevant inspections. components for maintenance.

A stable, reliable and adjustable single-phase and double-phase flow negative pressure sewage collection system, including a vacuum pump station used to provide system negative pressure, and a plurality of stable, reliable and adjustable as mentioned above connected through negative pressure suction pipes Single and double phase flow negative pressure sewage collection well.

Compared with the prior art, the beneficial effects of the present invention are as follows:

A gas-liquid mixing space is formed by arranging an isolation cover above the sealing head. During the negative pressure suction process, the gas flux between the gas-liquid mixing space and the external atmospheric environment is changed, as well as the relative relationship between the sealing head and the isolation cover. position to achieve flexible adjustment of the gas-liquid mixing ratio in the negative pressure suction pipe. It has a simple structure, high reliability, stable operation and easy maintenance.

Description of drawings

Figure 1 is the overall schematic diagram 1 of the negative pressure sewage collection well of this application;

Figure 2 is the overall schematic diagram 2 of the negative pressure sewage collection well of this application;

Figure 3 is an overall schematic diagram of a preferred embodiment of the negative pressure sewage collection well of the present application;

Figure 4a and Figure 5a are schematic diagrams when the negative pressure suction port is blocked;

Figure 4b and Figure 5b are schematic diagrams of the liquid level submerging the floating body below and gradually rising;

Figure 4c and Figure 5c are schematic diagrams of the blocking head rising to open the negative pressure suction port;

Figure 4d and Figure 5d are schematic diagrams of the negative pressure suction port absorbing water during the liquid level drop process;

Figure 4e and Figure 5e are schematic diagrams of the negative pressure suction port absorbing water and air during the liquid level drop process;

Figure 4f and Figure 5f are schematic diagrams of the sealing head re-blocking the water outlet when the liquid level returns to the initial state.

Reference signs: 1. Shell; 2. Water inlet; 3. Water collection space; 4. Maintenance space; 5. Air pressure gauge; 6. Cover plate; 7. Annular flange; 8. Partition; 9. Negative pressure Suction pipe; 10. Water outlet; 11. Sealing head; 12. Isolation cover; 13. Gas-liquid mixing space; 14. Floating body; 15. Connecting rod; 16. Guide limit rod; 17. Guide limit cylinder; 18. Water inlet; 19. First base; 20. Second base; 21. Connecting rod; 22. Screw handle; 23. Air inlet pipe; 24. Regulating valve; 25. Restricting ring; 26. Locking nut ; 27. Fixing nut; 28. Upper floating body; 29. Lower floating body.

Detailed ways

The present application will be further described in detail below with reference to the embodiments and drawings, but the implementation of the present invention is not limited thereto.

A stable, reliable and adjustable single- and double-phase flow negative pressure sewage collection well, as shown in Figure 1, includes a shell 1. The whole shell 1 has a cup-shaped or barrel-shaped structure with a large bottom and a small top, and its outer wall is preferably integrated Provided with reinforcing ribs or ribs. After the shell 1 with the above structure is buried underground, it is affected by the extrusion of the soil layer, and its position is more stable and is less likely to sink and shift. It is also less likely to loosen and crack after the pipes are connected.

A plurality of water inlets 2 are provided on the side wall of the housing 1 near the maintenance space 4 along its circumferential direction. The water inlets 2 are connected to external sewage pipes, and their number is configured according to actual needs. In a specific implementation, the number of water inlets 2 may be set to one. The outer wall of the housing 1 is provided with a protrusion at the water inlet 2 to facilitate the connection of external sewage pipes.

The above-mentioned housing 1 is entirely made of PP or PE material, and may also be made of other materials in specific embodiments. The inner section of the housing 1 located below the water inlet 2 is configured as a water collection space 3, and the upper section is configured as a maintenance space 4. The maintenance space 4 is provided with monitoring devices for reflecting the working status of each component in the negative pressure sewage collection well, such as with the negative pressure sewage collection well. Pressure suction pipe 9 connected to the air pressure gauge 5 and so on. A cover plate 6 is arranged at the opening of the housing 1. After the installation of the negative pressure sewage collection well is completed, the cover plate 6 is located above the ground. The maintenance personnel can maintain the relevant devices in the maintenance space 4 by opening the cover plate 6, or they can It is convenient to check the output of the monitoring device to judge or adjust the working status of each component in the negative pressure sewage collection well.

As shown in Figure 1, in order to facilitate maintenance and prevent ground objects from falling into the water collection space 3, the side wall of the housing 1 between the water collection space 3 and the maintenance space 4 is recessed inward to form an annular flange 7. The above-mentioned annular flange 7 is detachably provided with a partition 8 via bolts, and a ventilation hole is provided on the partition 8 so that the air pressure in the water collection space 3 is consistent with the maintenance space 4, that is, the atmospheric pressure.

The housing 1 is connected with a negative pressure suction pipe 9 , and the negative pressure suction pipe 9 forms a water outlet 10 in the housing 1 to suck sewage away from the water collection space 3 . As shown in Figure 1, the negative pressure suction pipe 9 passes through the maintenance space 4 and then bends in a vertical state, passes through the partition 8, enters the water collection space 3, and is bent at the bottom of the water collection space 3 to form an opening facing upwards. The water outlet is 10. A section of the negative pressure suction pipe 9 close to the water outlet suction port 10 is located at the bottom of the water collection space 3 and is arranged vertically upward. The suction port is folded to form or connected with a bell mouth.

A blocking assembly is provided above the water outlet suction port 10 in the housing 1 for moving in a set direction to block or open the water outlet suction port 10 . The blocking component is connected to a blocking driving component for driving its movement according to the liquid level in the housing 1 to block or open the water outlet suction port 10 .

As shown in FIG. 2 , the above-mentioned blocking assembly mainly includes a blocking head 11 for blocking the water outlet 10 and an isolation cover 12 disposed above the blocking head 11 . Between the isolation cover 12 and the blocking head 11 A gas-liquid mixing space 13 is formed.

In order to make the solution description clearer, the blocking drive component will be explained in detail below.

The plugging drive component is mainly used to drive the movement of the plugging component according to the level of the liquid. Different from the driving method that combines electronics and mechanics in the prior art, in the embodiment of the present application, the blocking driving assembly mainly includes a floating body 14 and a driving limiter. The structure and operation mode of the blocking drive assembly will be illustrated below by arranging the opening of the water outlet suction port 10 vertically upward. It should be noted that the opening direction or location of the water outlet suction port 10 can be set as needed. The embodiments described in the application are only preferred embodiments.

As shown in Figure 2, the floating body 14 is floatingly arranged in the water collection space 3, and is fixedly connected to the blocking component through a hard connecting rod 15 or directly through screws, and rises and falls as the liquid level changes. When lifting, the above-mentioned floating body 14 will drive the blocking assembly to move toward or away from the water outlet suction port 10 . In order to ensure that the blocking head 11 of the blocking assembly can still accurately block the water outlet 10 after the floating body 14 reciprocates, a driving limiter is installed in the housing 1 to limit the movement direction of the floating body 14 . The above-mentioned driving limiter is configured to be fixedly connected to the housing 1 and is used to limit the movement direction of the floating body 14 when it rises and falls with the liquid level. When there is no sewage in the water collection space 3, the floating body 14 is in the initial position, and the blocking head 11 is pressed against the water outlet 10. When the liquid level in the water collection space 3 gradually rises and reaches the first set value, the buoyancy force on the floating body 14 is greater than the sum of the gravity of the floating body 14, the gravity of the plugging assembly, and the suction force of the negative pressure suction pipe 9 on the plugging head 11. The floating body 14 floats up to drive the sealing head 11 away from the water outlet 10 and start negative pressure suction. In actual applications, there may be other forces acting on the floating body 14, which will not be listed here. The above technical solution directly uses the buoyancy force of the floating body 14 when the liquid level rises to drive the movement of the blocking component, and can automatically block or open the water outlet suction port 10 according to the level of the liquid. It has a simple structure, is stable and reliable.

In detail, the floating body 14 is made of a hollow floating ball or low-density material, such as foam material. If it is a hollow structure, a reinforcing rib structure can be added therein as needed to increase the structural strength of the floating body 14 .

As shown in FIGS. 1 and 2 , there are various implementations for the shape of the floating body 14 . The volume of the floating body 14 can be set to gradually increase from bottom to top; or it can be set so that the top and bottom volumes of the floating body 14 are larger than the middle volume; or the floating body 14 can be set to In order to include the upper floating body 28 and the lower floating body 29, the upper floating body 28 and the lower floating body 29 are fixedly connected through lightweight hard connectors, such as lightweight stainless steel plates, at a set distance; or it is configured to include multiple lightweight hard connectors. The connectors are in the form of sub-floating bodies 14 that are fixedly connected at a set distance, and each sub-floating body 14 is arranged vertically.

Based on the above settings, when the sewage level in the water collection space 3 rises, the sewage will first cover the floating body 14 below. Since the floating body 14 below is small, the upward buoyancy force received by the floating body 14 at this time is not enough to offset the pair of water outlet suction ports 10. Due to the sum of the downward force exerted by the suction force of the blocking head 11 and the gravity of the floating body 14 , the blocking head 11 will still block the water outlet suction port 10 . As the liquid level continues to rise, the volume of the floating body 14 submerged by sewage also gradually increases. When the liquid level rises to the first set value, the upward buoyancy force received by the floating body 14 is greater than the downward force it receives. , the floating body 14 drives the blocking assembly to rise, and the negative pressure suction pipe 9 begins to suck the sewage in the water collection space 3. Since the middle part of the floating body 14 is small or arranged in multiple sections, the liquid level continues to rise after it submerges the lowermost floating body 14. The buoyancy force on the entire floating body 14 will not increase sharply until the sewage rises to the set height and submerges the next floating body. 14. This allows the negative pressure suction to be started only when the amount of sewage in the water collection space 3 exceeds a larger value, preventing the blocking component from repeatedly blocking the water outlet 10 as the liquid level rises or falls, and reducing the negative pressure of sewage. Collects well noise while also increasing the service life of the plugging components.

In the embodiment of the present application, the driving limiter includes a guide limiter rod 16 or a guide limiter cylinder 17 .

In one embodiment, as shown in Figure 2, the driving limiter uses a guide limiter rod 16. The driving limiter is made of hard material, such as stainless steel pipe, and its top end is connected to the inner wall of the housing 1 or the partition 8. The connection is fixed with bolts, and the other end is set vertically downward as the free end. The floating body 14 is provided with a sliding channel for the guide and limiting rod 16 to pass through, and the floating body 14 is slidably disposed on the guiding and limiting rod 16 .

Preferably, the top end of the guide limit rod 16 is fixed to the partition 8 or the inner wall of the housing 1 through a built-in mounting flange, and the guide rod is set as a straight rod as a whole, or a section along the opening direction of the water outlet suction port 10 is bent. Obtained, its free end faces and is close to the water outlet 10. The installation and disassembly of the floating body 14 of the above technical solution are very convenient, and can reduce the overall manufacturing cost of the negative pressure sewage collection well.

A limiting block for limiting the maximum displacement distance of the floating body 14 can be added to the limiting guide rod. The number of the guide limiting rods 16 is at least one, preferably two, so as to prevent the floating body 14 from rotating around its own axis when moving up and down.

In practical applications, the guide and limit rod 16 can be arranged in various ways. At least one end is fixed to the inner wall of the housing 1. At least one section of the rod is arranged along the opening direction of the water outlet 10 and penetrates the floating body 14 to ensure that the floating body 14 has sufficient movement distance.

In another embodiment, as shown in FIG. 1 , the driving limiter adopts a guide limiter cylinder 17 . The guide limiting cylinder 17 is made of PP or PE material like the housing 1, or can also be made of stainless steel. It includes a cylinder arranged along the opening direction of the water outlet 10. At least one end of the cylinder is fixedly connected to the inner wall of the housing 1. , the side wall or bottom opening of the cylinder is equipped with an inlet hole 18 for sewage to enter the cylinder. The cross-sectional shape of the floating body 14 matches the cross-sectional shape of the cylinder, and is slidably sleeved in the cylinder. In the embodiment of the present application, the bottom of the above-mentioned cylinder is fixed to the bottom wall of the housing 1, and the top is folded to form a flange structure, and is fixedly connected to the partition plate 8 through bolts.

In the embodiment of the present application, the above-mentioned cylinder is preferably configured in a cylindrical shape. In actual applications, it can be configured in other shapes as needed. Correspondingly, the floating body 14 is configured in a spherical or round cake shape.

As shown in Figure 1, the bottom of the housing 1 is recessed inward to form a first base 19 for locking the cylinder, or as shown in Figure 3, a first base 19 for locking the cylinder is fixedly installed on the bottom wall of the housing 1. the second base 20. The water inlet hole 18 is opened on the side wall of the cylinder, and flows into the cylinder from the side wall of the cylinder, or is opened on the second base 20, and enters the cylinder from the base through the lower opening of the cylinder.

Correspondingly, the cylinder is equipped with a locking structure that is adapted to the first base 19 or the second base 20 . The above-mentioned locking structure includes the cylinder itself or an annular plate arranged circumferentially along the side wall of the cylinder. The above technical solution can fix the position of the cylinder to ensure that the cylinder will not shift under the impact of sewage from the water inlet 2, thereby accurately limiting the movement direction of the floating body 14 and ensuring that the blocking head 11 can accurately block the water outlet 10.

The water inlet hole 18 on the cylinder is arranged in a long strip or a round hole along the height direction of the cylinder. In a specific embodiment, a filter is provided at the above water inlet hole 18, or the aperture size of the water inlet hole 18 is directly limited. Within a specific range to prevent large volumes of impurities in the sewage from clogging the negative pressure suction pipe 9.

As shown in FIGS. 1 and 2 , in the embodiment of the present application, the plugging head 11 in the plugging assembly is coaxially arranged with the trumpet-shaped water outlet suction port 10 . The plugging head 11 is configured in a spherical, conical or truncated cone shape. The whole plugging head 11 is made of rubber, or the inner core is made of hard material, and the surface is covered with a soft sealing layer. The above arrangement method can effectively improve the sealing effect of the plugging head 11. In the specific implementation, the plugging head 11 can be flexibly selected according to the size of the negative pressure suction force. The maximum outer diameter of the plugging head 11 is not less than the water outlet suction port 10. Inner diameter size.

The isolation cover 12 is cup-shaped with the opening facing downward. The blocking head 11 is arranged in the isolation cover 12 through a connecting rod 21 that penetrates the top of the isolation cover 12. In the initial state, the blocking head 11 is located inside the opening of the isolation cover 12. .

The housing 1 is also provided with a plug position adjustment component for adjusting the vertical distance between the effective blocking surface of the plugging head 11 and the opening plane of the isolation cover 12, and for adjusting the relationship between the gas-liquid mixing space 13 and the outside. The air flux adjustment component determines the air flow rate of the atmospheric environment. The above-mentioned effective blocking surface is defined as: the surface of the blocking head 11 that contacts the water outlet suction port 10 and plays a blocking role.

In detail, a section of the surface of the connecting rod 21 that is connected to the isolation cover 12 is provided with threads and is threadedly connected to the threaded hole opened in the isolation cover 12 via the threads. When it is necessary to adjust the relative position between the isolation cover 12 and the blocking head 11, it is only necessary to relatively screw the connecting rod 21 or the isolation cover 12. Based on the above embodiments, the plug position adjustment assembly includes a screwing handle 22 for screwing the connecting rod 21 and/or the isolation cover 12 .

In the embodiment of the present application, the above-mentioned air flux adjustment assembly includes an air inlet pipe 23 connected to the gas-liquid mixing space 13. One end of the air inlet pipe 23 away from the blocking assembly opens above the floating body 14, and the end close to the blocking assembly passes through The isolation cover 12 is connected with the gas-liquid mixing space 13 . The section of the air inlet pipe 23 located outside the water collecting space 3 is provided with a regulating valve 24 for adjusting its air flux. The above technical solution can flexibly adjust the air flow between the gas-liquid mixing space 13 and the external atmospheric environment.

As shown in Figure 3, which is the preferred overall implementation of the solution of the present application, the negative pressure sewage collection well includes a housing 1. A plurality of water inlets 2 are provided on the side wall of the housing 1. The water inlets 2 are located in the housing 1. The space below is set as water collection space 3 for collecting sewage, and the space above the water inlet 2 is set as maintenance space 4. A partition 8 is detachably provided between the water collection space 3 and the maintenance space 4.

The negative pressure suction pipe 9 passes through the maintenance space 4 and then enters vertically into the water collection space 3. A section close to the water outlet suction port 10 is located at the bottom of the water collection space 3 and is arranged vertically upward. The suction port is provided with Trumpet.

The sealing drive assembly is configured as two floating bodies 14 connected up and down. The volume of the lower floating body 14 is smaller than the volume of the upper floating body 14. The upper and lower floating bodies 29 and their intermediate connecting parts are integrally formed.

The driving limiter includes a guide limiter cylinder 17 fixed vertically in the water collecting space 3. The guide limiter cylinder 17 is cylindrical, and the two corresponding floating bodies 14 are in the shape of a pancake. The cross-sectional diameter of the floating body 14 is the same as the guide limiter. The inner diameter of the limiting cylinder 17 is equivalent, and the floating body 14 and the guide limiting cylinder 17 are arranged to slide coaxially. The water outlet suction port 10 is located near the bottom of the guide limiting cylinder 17 .

The bottom of the floating body 14 is provided with an airtight groove along the axial direction of the guide limiting tube 17 , that is, in the vertical direction. The airtight groove forms an opening at the bottom of the floating body 14 .

The isolation cover 12 in the blocking assembly is directly configured as the body of the floating body 14. The blocking head 11 is connected to the air-tight groove through the connecting rod 21 passed through the floating body 14, and forms a gas-liquid mixing space 13 between the air-tight groove and the air-tight groove. . In a specific embodiment, a flow restriction ring 25 for controlling the size of the opening of the air-tight groove and/or a guide plate for guiding sewage into the gas-liquid mixing space 13 at a set angle can be installed at the opening of the air-tight groove.

The floating body 14 is provided with an air inlet channel connected with the gas-liquid mixing space 13. The air flux adjustment assembly includes an air inlet pipe 23. One end opening of the air inlet pipe 23 is located above the floating body 14 and is provided with a regulating valve 24. The above-mentioned position Always above the liquid level. One end of the air inlet pipe 23 close to the floating body 14 is connected to the air inlet channel, or is directly connected to the gas-liquid mixing space 13 through the air inlet channel.

A limiting structure or limiting piece is provided between the floating body 14 and the guide limiting cylinder 17 to prevent the floating body 14 from rotating. In this preferred embodiment, the inner wall of the guiding limiting cylinder 17 is provided with a limiting protrusion along its height direction. The side wall of the floating body 14 is provided with a limiting groove that matches the limiting protrusion in the vertical direction. When the floating body 14 slides in the guide limiting cylinder 17, the limiting groove and the limiting protrusion are provided. They cooperate with each other to prevent the floating body 14 from rotating.

The floating body 14 is vertically provided with a connecting channel. The plug position adjustment assembly includes a connecting rod 21, a locking nut 26 and a fixing nut 27 fixed on the top of the floating body 14. One end of the connecting rod 21 extends into the gas-liquid mixing space 13 It is fixedly connected to the blocking head 11, and the other end goes out to the top of the floating body 14 and is provided with a screw handle 22. A section of the side wall of the connecting rod 21 connected to the floating body 14 is provided with threads that match the fixing nut 27. The connecting rod 21 21 is threadedly connected to the floating body 14 via the fixing nut 27.

The above technical solution directly uses the body of the floating body 14 to form the isolation cover 12, which simplifies the structure of the negative pressure sewage collection well. At the same time, the height of the opening set at the bottom of the body of the floating body 14 and the position of the plug always follow the change of the liquid level in the water collection space 3. The work is stable and reliable, and does not involve precision electronic or mechanical components. It is highly reliable and easy to maintain.

The following will take the above-mentioned preferred overall implementation as an example and describe in detail the implementation principles and beneficial effects of the solution of this application in conjunction with Figures 4a-4f and 5a-5f:

For clarity of explanation, FIG. 4 and FIG. 5 are used to illustrate the different drainage effects caused by the blocking head 11 being located at different positions in the isolation cover 12 .

After the installation of the negative pressure sewage collection well is completed, in the initial state, as shown in Figure 4a and Figure 5a, the plugging head 11 is affected by the gravity of the floating body 14, its own gravity and the suction of the negative pressure suction pipe 9 (in practice, it will also be affected by the plugging head 11 The influence of its own buoyancy, the gravity of the plug position adjustment component, the viscous force of the guide limit tube 17 on the floating body 14 and other forces are explained here in a simplified manner without detailed force analysis. The above simplification does not affect the public's understanding of the application plan. Under the combined action of the negative pressure suction port, the negative pressure suction pipe 9 is blocked.

After the sewage enters the water collection space 3 through the water inlet 2, as shown in Figure 4a and Figure 5a, the lower floating body 29 located below gradually begins to receive buoyancy, but at this time the vertical upward buoyancy is not enough to offset the buoyancy of the blocking head 11. The vertical downward force causes the negative pressure suction pipe to turn off at position 9. As the liquid level in the water collection space 3 continues to rise, as shown in Figures 4b and 5b, the upper floating body 28 begins to receive buoyancy. Finally, when the liquid level rises to a set value, as shown in Figures 4c and 5b As shown in Figure 5c, the buoyancy force on the upper and lower floating bodies 29 is greater than the vertical downward force acting on the plugging head 11, that is, the plugging head 11 as a whole is forced upward. At this time, the plugging head 11 is separated from the water outlet suction port 10. , the sewage enters the negative pressure suction pipe 9. During this process, once the plugging head 11 is separated from the water outlet 10, the suction force received by the plugging head 11 will disappear instantly, the upward force it will receive will increase sharply, and the floating body 14 will rise rapidly with the plugging head 11. Moreover, since there is a large distance between the upper and lower floating bodies 29, the force acting on the plugging head 11 will not increase significantly when the liquid level rises in this distance, which means that the plugging assembly can be installed in the water collection space 3 It is opened only after the liquid level reaches a very high position, thereby avoiding frequent shutting off or opening of the water outlet suction port 10 of the sealing head 11, reducing noise and extending the service life of the sealing head 11.

As the sewage is extracted by the negative pressure suction pipe 9, the liquid level in the water collecting space 3 begins to gradually decrease. When the effective blocking surface of the blocking head 11 is located outside the opening of the isolation cover 12 formed by the floating body 14, the sealing The plug 11 comes into contact with the water outlet 10 before the isolation cover 12. During the shutdown process, the negative pressure suction pipe 9 is always in liquid phase flow, that is, no air enters the negative pressure suction pipe 9; when the plug 11 When the effective blocking surface is located inside the opening of the isolation cover 12, as shown in Figures 4 and 5, the opening of the isolation cover 12 comes into contact with the water outlet suction port 10 before the blocking head 11. At this time, a gap is formed between the liquid level and the isolation cover 12. A negative pressure gas-liquid mixing space 13. As shown in Figure 4d and Figure 5d, after the negative pressure suction pipe 9 draws out the sewage in the gas-liquid mixing space 13, as long as the suction flow rate of the negative pressure suction pipe 9 is greater than the air intake volume of the air inlet pipe 23, this Then a negative pressure will be formed in the gas-liquid mixing space 13, and the sewage located at the opening of the isolation cover 12 will be sucked into the gas-liquid mixing space 13, as shown in Figure 4e and Figure 5e. Finally, the sewage will enter together with the air. to the negative pressure suction pipe 9 to achieve the effect of gas-liquid two-phase mixed flow.

It can be seen from Figure 4f and Figure 5f that in the latter, more air will be sucked into the negative pressure suction pipe 9 before the water outlet suction port 10 is blocked. It can be seen from the above process that by changing the relative distance between the opening plane of the blocking head 11 and the floating body 14, that is, the opening plane of the isolation cover 12, and/or the size of the gas flux between the gas-liquid mixing space 13 and the external atmospheric environment, it is convenient to The gas-liquid mixing ratio in the negative pressure suction pipe 9 can be flexibly and conveniently adjusted. In practice, it is found that with this application plan, the gas-liquid ratio adjustment range in the negative pressure suction pipe 9 can reach 0:1 to 15:1, which is far It is much higher than the gas-liquid mixing ratio adjustment range when draining liquid from negative pressure sewage collection wells in the prior art.

It can be seen from Figure 3 combined with Figure 4 that when it is necessary to adjust the gas-liquid mixing ratio in the negative pressure suction pipe 9, it is only necessary to open the partition 8 and screw the screw handle 22 or the screw handle 22 connected to the upper end of the connecting rod 21. Just turn the regulating valve 24, which is very convenient. Since no electronic or other precision mechanical components are used in the entire equipment, the entire negative pressure sewage collection well is more stable and reliable, the service life is significantly improved, and the control effect is also more stable and reliable.

Based on the above stable, reliable and adjustable single-phase flow negative pressure sewage collection well, this application also proposes a stable, reliable and adjustable single-phase flow negative pressure sewage collection system, including a vacuum pump station for providing system negative pressure, and Multiple stable, reliable and adjustable single- and double-phase flow negative pressure sewage collection wells are connected through 9 negative pressure suction pipes. The above-mentioned vacuum pumping station is equipped with a vacuum tank for collecting sewage and a vacuum pump connected with the vacuum top tank. One end of the negative pressure suction pipe 9 away from the sewage collection well is connected with the side wall of the above-mentioned vacuum tank near the top.

The above are only preferred embodiments of the present application. The protection scope of the present application is not limited to the above-mentioned embodiments. All technical solutions that fall under the ideas of the present application belong to the protection scope of the present application. It should be pointed out that for those of ordinary skill in the art, several improvements and modifications may be made without departing from the principles of the present application, and these improvements and modifications should also be regarded as the protection scope of the present application.

Claims (13)

1. A single-phase flow negative pressure sewage collecting well that is reliable and stable adjustable, characterized in that includes:

the water collecting device comprises a shell (1), wherein a water collecting space (3) is arranged in the shell and is provided with a water inlet (2), the water collecting space (3) is communicated with a negative pressure suction pipe (9), and the negative pressure suction pipe (9) forms a water outlet suction port (10) in the water collecting space (3);

the blocking assembly is arranged above the water outlet suction port (10) and comprises a blocking head (11) for blocking the water outlet suction port (10) and a shielding cover (12) arranged above the blocking head (11), and a gas-liquid mixing space (13) is formed between the shielding cover (12) and the blocking head (11);

the plugging driving assembly is configured to drive the plugging assembly to move towards or away from the water outlet suction port (10) according to the liquid level height in the water collecting space (3) so as to plug or open the water outlet suction port (10);

the plug position adjusting assembly is configured to adjust the distance between the effective plugging surface of the plugging head (11) and the opening plane of the isolation cover (12); and

a gas flux adjustment assembly configured to adjust the gas flux of the gas-liquid mixing space (13) with the outside atmosphere;

when the liquid level in the water collecting space (3) is gradually increased and is higher than a first set value, the plugging driving assembly drives the plugging assembly to be far away from the water outlet suction port (10), and negative pressure suction is started;

When the liquid level in the water collecting space (3) is gradually reduced and is lower than a second set value, a plugging head (11) in the plugging assembly plugs the water outlet suction port (10).

2. The stable, reliable and adjustable single-phase flow negative pressure sewage collection well according to claim 1, wherein the water outlet suction port (10) is arranged at the bottom position of the water collecting space (3) with an opening upwards, and the plugging driving assembly comprises:

the floating body (14) is arranged in the water collecting space (3) in a floating manner, is fixedly connected with the plugging assembly and rises and falls along with the liquid level;

the driving limiting piece is configured to be fixedly connected with the shell (1) and used for limiting the movement direction of the floating body (14) along with the lifting of the liquid level;

when the floating body (14) is positioned at the initial position, the plugging head (11) abuts against the water outlet suction port (10);

when the liquid level in the water collecting space (3) rises to the first set value, the buoyancy force borne by the floating body (14) is larger than the sum of the gravity of the floating body (14), the gravity of the plugging component and the suction force of the negative pressure suction pipe (9) to the plugging head (11), and the floating body (14) floats upwards to drive the plugging head (11) to be separated from the water outlet suction port (10), so that the negative pressure suction is started.

3. The stable, reliable and adjustable single-phase flow negative pressure sewage collection well according to claim 2, wherein the floating body (14) is made of hollow floating balls or low-density materials;

The volume of the floating body (14) is gradually increased from bottom to top; or (b)

The top and bottom volumes of the float (14) are greater than the middle volume; or (b)

The floating body (14) comprises an upper floating body (28) and a lower floating body (29), and the upper floating body (28) and the lower floating body (29) are fixedly connected with each other through a connecting piece at a set distance; or (b)

The floating body (14) comprises a plurality of sub-floating bodies (14) which are fixedly connected at set intervals through connecting pieces, and each sub-floating body (14) is vertically arranged.

4. A stable, reliable and adjustable single-phase flow negative pressure sewage collection well according to claim 3, wherein the drive limiter comprises:

the guide limiting rod (16) is arranged, at least one end of the guide limiting rod is fixedly connected with the inner side wall of the shell (1), at least one section of rod body is arranged along the opening direction of the water outlet (10) and penetrates through the floating body (14), and the floating body (14) is slidably arranged on the guide limiting rod (16); or (b)

The guide limiting cylinder (17) comprises a cylinder body arranged along the opening direction of the water outlet port (10), at least one end of the cylinder body is fixedly connected with the inner side wall of the shell (1), a water inlet (18) for sewage to enter the cylinder body is arranged on the side wall or the bottom opening of the cylinder body, and the section shape of the floating body (14) is matched with the section shape of the cylinder body and is sleeved in the cylinder body in a sliding manner.

5. The stable, reliable and adjustable single-phase flow negative pressure sewage collecting well according to claim 4, wherein the top end of the guiding limit rod (16) is fixedly arranged on the inner side wall of the shell (1) through a built-in mounting flange, the whole guiding rod is a straight rod, or a section of the guiding rod arranged along the opening direction of the water outlet suction port (10) is bent, and the free end of the guiding rod faces towards and is close to the water outlet suction port (10).

6. The stable, reliable and adjustable single-phase flow negative pressure sewage collecting well according to claim 4, wherein the bottom of the shell (1) is inwards sunken to form a first base (19) for clamping the cylinder, or a second base (20) for clamping the cylinder is fixedly arranged on the bottom wall of the shell (1);

the water inlet hole (18) is arranged on the side wall of the cylinder body or is arranged on the second base (20);

the cylinder body is provided with a locking structure matched with the first base (19) or the second base (20).

7. The stable, reliable and adjustable single-phase flow negative pressure sewage collection well according to claim 4, wherein the opening direction of the water outlet suction port (10) is vertically upwards, and the opening is configured in a horn shape;

The guide limiting rod (16) or the guide limiting cylinder (17) are vertically arranged, and the plugging head (11) and the water outlet suction port (10) are coaxially arranged;

the plugging head (11) is configured to be spherical or truncated cone-shaped;

the whole plugging head (11) is made of rubber, or the inner core is made of hard material, and the surface of the plugging head is coated with a soft sealing layer.

8. The stable, reliable and adjustable single-phase flow negative pressure sewage collecting well according to claim 4, wherein the isolation cover (12) is cup-shaped and has a downward opening, and the plugging head (11) is arranged in the isolation cover (12) through a connecting rod (21) penetrating through the top of the isolation cover (12);

a section of surface, connected with the isolation cover (12), of the connecting rod (21) is provided with threads, and the connecting rod (21) is in threaded connection with the isolation cover (12);

the plug position adjusting assembly comprises a screwing handle (22) for screwing the connecting rod (21) and/or the isolation cover (12).

9. The stable, reliable and adjustable single-phase flow negative pressure sewage collection well according to claim 4, wherein the air flux adjusting assembly comprises an air inlet pipe (23), one end opening of the air inlet pipe (23) far away from the plugging assembly is positioned above the floating body (14), and one end close to the plugging assembly passes through the isolation cover (12) to be communicated with the air-liquid mixing space (13);

A section of the air inlet pipe (23) above the floating body (14) is provided with a regulating valve (24) for regulating the air flux of the air inlet pipe.

10. The stable, reliable and adjustable single-phase flow negative pressure sewage collecting well according to claim 7, wherein a section of the negative pressure suction pipe (9) close to the water outlet suction port (10) is positioned at the bottom of the water collecting space (3) and is vertically upwards arranged, and a horn mouth is formed or connected at the suction port in a turnover way;

the driving limiting piece comprises a guiding limiting cylinder (17) vertically and fixedly arranged in the water collecting space (3), and the water outlet suction port (10) is positioned in the guiding limiting cylinder (17);

the floating body (14) and the guide limit cylinder (17) are coaxially and slidably arranged, an airtight groove is formed in the bottom of the floating body (14) along the axial direction of the guide limit cylinder (17), and an opening is formed in the bottom of the floating body (14) through the airtight groove;

the isolation cover (12) is configured as the body of the floating body (14), the plugging head (11) is connected and arranged in the airtight groove through a connecting rod (21) penetrating through the floating body (14), and the gas-liquid mixing space (13) is formed between the sealing head and the airtight groove;

the floating body (14) is provided with an air inlet channel communicated with the air-liquid mixing space (13) in a penetrating way, the air flux adjusting component comprises an air inlet pipe (23), one end of the air inlet pipe (23) extends out of the floating body (14), and the other end of the air inlet pipe is communicated with the air inlet channel or the air-liquid mixing space (13) directly;

The plug position adjusting assembly is arranged between the floating body (14) and the connecting rod (21).

11. The stable, reliable and adjustable single-phase flow negative pressure sewage collection well according to claim 10, characterized in that a limiting structure or a limiting piece for preventing the floating body (14) from rotating is arranged between the floating body (14) and the guiding limiting cylinder (17);

a connecting channel is vertically and penetratingly arranged in the floating body (14);

the plug position adjusting assembly comprises a connecting rod (21), a locking nut (26) and a fixing nut (27) fixed at the top of the floating body (14), one end of the connecting rod (21) extending into the gas-liquid mixing space (13) through a connecting channel is fixedly connected with the plug head (11), the other end of the connecting rod penetrates out of the top of the floating body (14) and is provided with a screwing handle (22), a section of side wall of the connecting rod (21) connected with the floating body (14) is provided with threads matched with the fixing nut (27), and the connecting rod (21) is connected with the floating body (14) through the fixing nut (27) in a threaded mode.

12. The stable, reliable and adjustable single-phase flow negative pressure sewage collecting well according to claim 1, wherein the shell (1) is of a cup-shaped structure with a lower size and an upper size, the lower section of the shell is configured as the water collecting space (3), the upper section of the shell is configured as the maintenance space (4), and a cover plate (6) is configured at an opening of the shell (1);

At least one water inlet (2) is arranged on the side wall of the shell (1) close to the maintenance space (4);

the negative pressure suction pipe (9) passes through the maintenance space (4) to enter the water collecting space (3), and the water outlet suction port (10) is formed at the bottom of the water collecting space (3);

a partition plate (8) is detachably arranged between the maintenance space (4) and the water collecting space (3);

and a monitoring device for reflecting the working state of each component in the negative pressure sewage collecting well is arranged in the maintenance space (4).

13. A stable, reliable and adjustable single-phase and double-phase flow negative pressure sewage collection system is characterized by comprising a vacuum pump station for providing system negative pressure and a plurality of stable, reliable and adjustable single-phase and double-phase flow negative pressure sewage collection wells communicated with each other through a negative pressure suction pipe (9).