Siphon drainage device for sewage pool

Abstract

The present invention discloses a sewage pool siphon drainage device, comprising a U-shaped siphon pipe, a fixing bracket, and an air extraction device. The U-shaped siphon pipe includes a main channel and an auxiliary channel. The main channel includes an interconnected water inlet section, a connecting section, and a water outlet section. The connecting section connects the water inlet section and the water outlet section. The water inlet section is fixed to the inner wall of the sewage pool by a fixing bracket. The auxiliary channel connects the connecting section. The air extraction device includes an air extraction mechanism and a one-way valve. The air extraction mechanism is connected to the auxiliary channel for extracting air into the auxiliary channel. The one-way valve is also connected to the auxiliary channel for ensuring one-way conduction of the auxiliary channel. The one-way valve includes a cavity, a baffle, a fixing nut, and an air core. The fixing nut is located at the bottom of the cavity and connects the auxiliary channel to the cavity. The air core is located at the top of the cavity. The baffle is connected below the air core. The baffle is provided with an opening, and a sealed air bag is provided in the opening. Compared with the prior art, the present invention can achieve efficient and zero-energy sewage discharge.

Description

Technical Field

[0001] The present invention relates to the technical field of drainage, in particular to a siphon drainage device for a sewage pool. Background Art

[0002] In the field of sewage treatment, sewage pool drainage technology is of vital importance. Traditional sewage pool drainage methods mainly rely on pumping or gravity flow. When using the pumping method, although it can overcome certain drainage height and distance limitations, the entire drainage process is completely dependent on electric drive. Not only is the cost of electricity resource consumption high, but the pump body and other equipment require regular maintenance, such as replacing worn parts and clearing blockages. The long-term maintenance costs significantly increase the economic burden of sewage treatment. Although the gravity flow method does not require additional electricity consumption, it is greatly limited by the water level difference between the sewage pool and the drainage terminal. When the water level difference is insufficient, the drainage efficiency is extremely low, or even effective drainage cannot be achieved, making it difficult to meet the needs of actual sewage treatment scenarios.

[0003] Existing siphonic drainage systems attempt to address these issues to some extent, but most suffer from significant drawbacks. Many require manual triggering of the siphoning process, which is cumbersome and ill-suited for automated management. Some systems rely on complex control devices, increasing equipment costs and making them prone to malfunctions due to their complexity, making automatic start / stop and stable operation difficult.

[0004] In view of this, a sewage pool siphon drainage device is proposed. Summary of the Invention

[0005] The purpose of the present invention is to provide a siphon drainage device for a sewage pool, which can achieve high-efficiency and zero-energy discharge of sewage.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions:

[0007] A siphon drainage device for a sewage pool includes a U-shaped siphon pipe, a fixing bracket and an air extraction device, the U-shaped siphon pipe includes a main channel and an auxiliary channel, the main channel includes an inlet section, a connecting section and an outlet section connected to each other, the connecting section connects the inlet section and the outlet section, the inlet section is fixed to the inner wall of the sewage pool by the fixing bracket, the auxiliary channel is connected to the connecting section, the air extraction device includes an air extraction mechanism and a one-way valve, the air extraction mechanism is connected to the auxiliary channel for extracting air into the auxiliary channel, the one-way valve is also connected to the auxiliary channel for making the auxiliary channel unidirectional, the one-way valve includes a cavity, a baffle, a fixing nut and an air core, the fixing nut is arranged at the bottom of the cavity for connecting the auxiliary channel and the cavity, the air core is arranged at the top of the cavity, the baffle is connected below the air core, an opening is provided on the baffle, and a closed air bag is provided in the opening.

[0008] In a preferred embodiment, the closed airbag is made of rubber material.

[0009] In a preferred embodiment, a plurality of closed airbags are provided in the opening.

[0010] In a preferred embodiment, a plurality of openings are provided, and the plurality of openings are evenly arranged.

[0011] In a preferred embodiment, a swirl anti-clogging device is provided at the end of the water inlet section, and the swirl anti-clogging device includes a plurality of blades and a central disc, one end of the blade is connected to the inner wall of the water inlet section, and the other end is connected to the central disc, and the plurality of blades are eccentrically arranged.

[0012] In a preferred embodiment, the blade offset ratio is 0.15-0.20, and the swirl angle is 20°-30°.

[0013] In a preferred embodiment, the air extraction mechanism includes a foot pedal, a lever, a piston rod, a piston head and a connecting rod. The piston head is arranged in the auxiliary channel, one end of the piston rod is connected to the piston head, and the other end is connected to the connecting rod. The other end of the connecting rod is connected to the lever, and the lever is connected to the foot pedal.

[0014] In a preferred embodiment, the water outlet section is inclined at 45°.

[0015] In a preferred embodiment, an automatic telescopic door is provided at the end of the water outlet section, the upper end of the automatic telescopic door is hinged to the end of the water outlet section, and a first magnet is provided at the lower part, and the end of the water outlet section has a second magnet attracted to the first magnet.

[0016] In a preferred embodiment, the distance between the first magnet and the second magnet is 1.5-3 cm, and the magnetic strength is ≥200 mT.

[0017] Compared to existing technologies, the present invention provides a siphonic drainage device for sewage pools. Its auxiliary channel connects to the connecting section, providing a pathway for air extraction and pressure regulation. The extraction mechanism in the device draws air from the interior of the siphon tube through the auxiliary channel, while a one-way valve ensures unidirectional airflow. These two mechanisms work together to create a negative pressure environment within the siphon tube, triggering the siphon effect, thereby enabling the gravity discharge of sewage without power pumping. This fundamentally addresses the electricity-dependent and high maintenance costs of traditional pumping drainage. It also overcomes the technical bottleneck of gravity-based drainage being limited by water level differences, achieving the goal of zero-energy sewage discharge.

[0018] The bottom of the check valve's cavity is connected to the auxiliary channel via a retaining nut. An air core is located at the top, and a baffle is attached below the core. A sealed airbag is located in the baffle opening. When the air pressure in the siphon tube is within the normal range, the baffle tightly covers the air core, and the sealed airbag fills the baffle opening, forming a seal. This prevents contaminants from passing through the baffle and contaminating the air core, preventing contamination or clogging of the air core, thus ensuring the long-term reliability of the device. However, when the system's internal air pressure exceeds a certain threshold (such as during the initial siphon startup or during operation due to pressure fluctuations caused by flow rate fluctuations), the air core automatically moves upward under the action of the air pressure, driving the baffle upward in tandem. This action acts as a restraint on the air core, preventing it from being completely dislodged from the cavity due to excessive air pressure, thus safeguarding its structural integrity. Furthermore, as the baffle rises, the sealed airbag deforms and contracts under pressure, releasing the air pressure and allowing gas to quickly exit the cavity. This releases excessive pressure in the siphon tube and prevents siphoning interruption due to pressure imbalance. When the air pressure drops to a safe range, the air core automatically resets under its own gravity and airflow, the baffle falls back to its initial position, the closed airbag inflates again to seal the opening, and the system returns to a sealed state, maintaining a stable siphon effect.

[0019] The synergistic effect of the above-mentioned mechanical structure and natural forces gives the device multiple technical advantages: First, the design of triggering the siphon by vacuuming allows the system to be started without human intervention. Compared with traditional manually triggered siphon devices, it significantly improves the level of automation and reduces operating costs; second, the pressure adaptive adjustment mechanism of the one-way valve can automatically complete the exhaust and sealing switching according to the changes in the air pressure in the siphon tube, avoiding the use of complex electronic control devices, reducing equipment costs, reducing operational risks caused by electronic component failures, and enhancing system stability; third, the combined structure of the closed airbag and the baffle effectively isolates pollutants while realizing the air pressure regulation function, solving the technical problem that the gas passage is easily blocked by impurities in the traditional siphon system, and extending the equipment maintenance cycle; fourth, the entire drainage process relies only on the siphon effect and the physical action of the mechanical structure, without the need for continuous energy consumption, in line with the concept of green environmental protection, and can operate adaptively under various water level conditions, broadening the application scenarios, especially suitable for sewage treatment scenarios in remote areas, unstable power supply or complex terrain.

[0020] In summary, the device has successfully overcome the bottlenecks of traditional drainage technology in energy consumption, automation, reliability and environmental adaptability through its sophisticated mechanical structure design and dynamic air pressure adjustment mechanism, and achieved the goals of high efficiency, stability and low energy consumption in sewage discharge. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The invention relates to a structural schematic diagram of a sewage pool siphon drainage device.

[0022] Figure 2 The present invention relates to a schematic structural diagram of an air extraction mechanism and a one-way valve of a sewage pool siphon drainage device.

[0023] Figure 3 The present invention is a structural schematic diagram of a cyclone anti-clogging device of a sewage pool siphon drainage device.

[0024] Figure 4 The invention relates to a structural schematic diagram of an automatic telescopic door of a sewage pool siphon drainage device.

[0025] Figure 5 The invention relates to a structural schematic diagram of a one-way valve of a sewage pool siphon drainage device.

[0026] Figure 6 The invention relates to a structural schematic diagram of a baffle of a sewage pool siphon drainage device.

[0027] Fixed bracket 1; main channel 2; water inlet section 3; connecting section 4; water outlet section 5; auxiliary channel 6; swirl anti-clogging device 7; blades 8; center disk 9; foot pedal 10; lever 11; piston rod 12; piston head 13; connecting rod 14; automatic telescopic door 15; first magnet 16; second magnet 17; one-way valve 18; cavity 19; fixing nut 20; air core 21; baffle 22; opening 23; closed airbag 24. DETAILED DESCRIPTION

[0028] The present invention will be further described in detail below with reference to the accompanying drawings.

[0029] This specific embodiment is merely an explanation of the present invention and is not intended to limit the present invention. After reading this specification, those skilled in the art may make non-creative modifications to this embodiment as needed. However, as long as such modifications are within the scope of the claims of the present invention, they are protected by patent law.

[0030] like Figures 1 to 6 As shown, a siphon drainage device for a sewage pool includes a U-shaped siphon, a fixed bracket 1 and an air extraction device, wherein the U-shaped siphon includes a main channel 2 and an auxiliary channel 6, the main channel 2 includes an inlet section 3, a connecting section 4 and an outlet section 5 connected to each other, the connecting section 4 connects the inlet section 3 and the outlet section 5, the inlet section 3 is fixed to the inner wall of the sewage pool by the fixed bracket 1, the auxiliary channel 6 is connected to the connecting section 4, the air extraction device includes an air extraction mechanism and a one-way valve 18, the air extraction mechanism is connected to the auxiliary channel 6, and the air extraction device includes an air extraction mechanism and a one-way valve 18. In order to evacuate air to the auxiliary channel 6, the one-way valve 18 is also connected to the auxiliary channel 6 to make the auxiliary channel 6 unidirectional. The one-way valve 18 includes a cavity 19, a baffle 22, a fixing nut 20 and an air core 21. The fixing nut 20 is arranged at the bottom of the cavity 19 to connect the auxiliary channel 6 and the cavity 19. The air core 21 is arranged at the top of the cavity 19. The baffle 22 is connected to the bottom of the air core 21. An opening 23 is provided on the baffle 22, and a closed air bag 24 is provided in the opening 23.

[0031] The present invention provides a siphon drainage device for a sewage pool. Its main channel 2 is responsible for high-flow discharge, and its auxiliary channel is used to maintain siphon continuity to avoid interruptions caused by sewage impurities. Its auxiliary channel 6 is connected to the connecting section 4, providing a path for air extraction and air pressure regulation. The air extraction mechanism in the air extraction device extracts air from the interior of the siphon tube through the auxiliary channel 6, and the one-way valve 18 ensures unidirectional air flow. The two work together to form a negative pressure environment in the siphon tube, triggering the siphon effect, thereby promoting the gravity discharge of sewage without power pumping. This fundamentally solves the problem of traditional pumping drainage relying on electricity and high maintenance costs. At the same time, it breaks through the technical bottleneck of gravity self-flow being limited by water level difference, achieving the goal of zero energy consumption for sewage discharge.

[0032] The bottom of the cavity 19 of the one-way valve 18 is connected to the auxiliary channel 6 via a fixing nut 20. An air core 21 is located at the top, and a baffle 22 is connected below the air core 21. A closed air bag 24 is located at the opening 23 of the baffle 22. When the air pressure in the siphon tube is within the normal range, the baffle 22 tightly blocks the air core 21, and the closed air bag 24 fills the opening 23 of the baffle 22, forming a sealed structure. This prevents contaminants from passing through the baffle 22 and contaminating the air core 21, preventing it from being contaminated or blocked by impurities, thus ensuring the long-term reliability of the device. When the air pressure within the system exceeds a specified threshold (such as pressure fluctuations caused by flow changes during the initial siphon startup or operation), the air core 21 automatically moves upward under the action of the air pressure, driving the baffle 22 to rise synchronously. At this point, baffle 22 limits the air core 21, preventing it from being completely flushed out of cavity 19 due to excessive air pressure, thus ensuring structural integrity. Furthermore, as baffle 22 rises, the air-sealing airbag 24 is deformed and contracted by the air pressure, releasing the seal on opening 23 of baffle 22, allowing air to quickly pass through opening 23 and out of cavity 19, thereby releasing the excessive air pressure in the siphon tube and preventing siphon interruption due to pressure imbalance. When the air pressure drops to a safe range, the air core 21 automatically resets under the action of its own gravity and airflow, baffle 22 returns to its initial position, and air-sealing airbag 24 expands again to seal opening 23, restoring the system to a sealed state and maintaining a stable siphon effect.

[0033] The synergistic effect of the above-mentioned mechanical structure and natural forces gives the device multiple technical advantages: First, the design of triggering the siphon by vacuuming allows the system to be started without human intervention. Compared with traditional manually triggered siphon devices, it significantly improves the level of automation and reduces operating costs; second, the pressure adaptive adjustment mechanism of the one-way valve 18 can automatically complete the exhaust and sealing switching according to the changes in the air pressure in the siphon tube, avoiding the use of complex electronic control devices, reducing equipment costs, reducing operational risks caused by electronic component failures, and enhancing system stability; third, the combined structure of the closed airbag 24 and the baffle 22 effectively isolates pollutants while realizing the air pressure regulation function, solving the technical problem that the gas passage in the traditional siphon system is easily blocked by impurities, and extending the equipment maintenance cycle; fourth, the entire drainage process relies only on the siphon effect and the physical action of the mechanical structure, without the need for continuous energy consumption, in line with the concept of green environmental protection, and can operate adaptively under various water level conditions, broadening the application scenarios, especially for sewage treatment scenarios in remote areas, unstable power supply or complex terrain.

[0034] In summary, the device has successfully overcome the bottlenecks of traditional drainage technology in energy consumption, automation, reliability and environmental adaptability through its sophisticated mechanical structure design and dynamic air pressure adjustment mechanism, and achieved the goals of high efficiency, stability and low energy consumption in sewage discharge.

[0035] Furthermore, the closed airbag 24 is made of rubber material, which makes the closed airbag 24 have good elasticity and thus good deformation performance. The closed airbag 24 and the opening 23 can be connected through two connection points.

[0036] There are many forms of setting the closed airbag 24. For example, a closed airbag 24 is set in an opening 23. Under normal circumstances, the closed airbag 24 completely blocks the opening 23. When it shrinks, it makes space for airflow to pass through. There is another setting method. A plurality of closed airbags 24 are set in the opening 23. The plurality of closed airbags 24 are mixed to form a community. Such a setting cannot achieve complete closure of the opening 23. In other words, it does not completely seal the opening 23. When the air pressure value is below the limit value, the multiple closed airbags 24 block the pollutants from contacting the air core 21. When the air pressure value is higher than the limit value, the volume of the closed airbag 24 is reduced, providing more airflow space. However, since there are multiple airbags at this time, it can still provide a good shielding effect, which is equivalent to the role of a filter.

[0037] In order to achieve smooth airflow, a plurality of openings 23 are provided, and the plurality of openings 23 are evenly arranged.

[0038] To prevent clogging, a swirl anti-clogging device 7 is provided at the end of the water inlet section 3. The swirl anti-clogging device 7 comprises a plurality of blades 8 and a central disc 9. One end of the blades 8 is connected to the inner wall of the water inlet section 3, and the other end is connected to the central disc 9. The plurality of blades 8 are eccentrically arranged. This asymmetric design improves the stability of the sewage discharge flow, prevents clogging, and improves drainage efficiency.

[0039] In this embodiment, the offset ratio of the blade 8 is 0.15-0.20, preferably set to 0.17, and the swirl angle is 20°-30°, preferably set to 25°.

[0040] Furthermore, the air extraction mechanism includes a foot pedal 10, a lever 11, a piston rod 12, a piston head 13, and a connecting rod 14. The piston head 13 is arranged in the auxiliary channel 6. One end of the piston rod 12 is connected to the piston head 13, and the other end is connected to the connecting rod 14. The other end of the connecting rod 14 is connected to the lever 11, and the lever 11 is connected to the foot pedal 10. The piston head 13 is driven to move by pressing the lever 11 by the foot pedal 10. The connecting rod 14 is hinged to the piston rod 12, driving the piston head 13 to reciprocate in the auxiliary channel. When the piston head 13 moves upward, the one-way valve 18 opens to expel the air in the main channel 2 pipeline. When the piston head 13 returns, the one-way valve 18 closes to prevent air backflow. The cycle operation quickly establishes and maintains a negative pressure state in the pipeline, and uses atmospheric pressure to suck water into the pipeline and discharge it.

[0041] In order to facilitate drainage, the water outlet section 5 is tilted at 45 degrees.

[0042] Furthermore, an automatic telescopic door 15 is provided at the end of the water outlet section 5. The upper end of the automatic telescopic door 15 is hinged to the end of the water outlet section 5, and the lower portion is provided with a first magnet 16. The end of the water outlet section 5 has a second magnet 17 that attracts the first magnet 16. The automatic telescopic door is circular and the same size as the water outlet section 5. The top end is connected to the top of the pipe. The telescopic door is normally closed due to the suction force generated between the first magnet 16 and the second magnet 17, preventing foreign matter from entering the pipe and causing blockage. When the water flow increases, the telescopic door opens by the impact of the beam and the gravity of the water to achieve drainage. When the water flow decreases, the telescopic door gradually closes under the action of its own gravity. The opening size of the automatic telescopic door 15 is determined by the water flow.

[0043] The magnet distance between the first magnet 16 and the second magnet 17 is 1.5-3 cm, and the magnetic strength is ≥200 mT.

[0044] A sewage pool siphon drainage device of this embodiment can reduce the buried depth of the pre-buried drain pipe and at the same time can reduce the pool configuration, and a drain pump can be installed when it is not necessary.

[0045] In this embodiment, the U-shaped siphon tube material: the main channel 2 and the auxiliary channel are both made of corrosion-resistant UPVC material with a wall thickness of 5 mm, the inner diameter of the main channel 2 is 200 mm, and the inner diameter of the auxiliary channel is 50 mm.

[0046] Structure: The main channel 2 and the auxiliary channel are connected by welding, the water outlet section 5 is tilted downward by 45 degrees, and an air extraction interface is set at the top of the auxiliary channel.

[0047] Installation: The water inlet end of the main channel 2 is fixed to the inner wall of the sewage tank through a stainless steel fixing bracket 1 (bolt M12). The bracket spacing is 1m to resist drainage vibration.

[0048] Air extraction mechanism: The lever 11 is 1.2m long, the pedal 10 is made of non-slip rubber and is connected to the piston rod 12 through a hinge; the piston rod 12 is made of 304 stainless steel and has a stroke of 30cm. The piston head 13 uses a silicone sealing ring and fits tightly with the inner wall of the auxiliary channel. Each time the foot pedal 10 is pressed, about 0.5L of air can be discharged from the auxiliary channel.

[0049] Anti-clogging cyclone device: Blade 8 parameters: There are 6 blades 8, which are asymmetrically staggered, with the center axis offset to the left by 17%, the swirl angle is 25°, the thickness of blade 8 is 3mm, and it is welded to the inner wall of the water inlet end of the main channel 2. Experiments show that the cyclone device can increase the sewage flow rate by 20% and the impurity separation efficiency reaches 85%.

[0050] One-way valve 18: The volume of cavity 19 is 0.3L, the opening 23 of baffle 22 is 8mm in diameter, the air core 21 is made of polytetrafluoroethylene, and the rising stroke of air core 21 is 5cm. When the air pressure in cavity 19 reaches 0.1MPa, the air core 21 automatically moves up to exhaust and automatically resets after exhausting;

[0051] Automatic telescopic door 15: Magnetic control: The telescopic door uses neodymium iron boron magnets (grade N35), which are installed at the end of the pipe and at the corresponding position of the telescopic door with an arc length of 2cm and a thickness of 1cm; the door body is made of silicone material with a thickness of 2mm. When the water flow speed is ≥0.5m / s, the telescopic door is fully opened; when it is ≤0.2m / s, the door body is closed under the action of magnetism and gravity.

[0052] It should be noted that, in this document, relational terms such as first and second, etc., are used solely to distinguish one entity or operation from another, and do not necessarily require or imply any actual relationship or order between these entities or operations. Furthermore, the terms "include," "comprise," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or terminal device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or terminal device. Without further limitation, elements defined by the phrase "include..." or "comprising..." do not exclude the presence of additional elements in the process, method, article, or terminal device comprising the elements. Furthermore, in this document, "greater than," "less than," "exceeding," etc., are understood to exclude the number itself; "above," "below," "within," etc., are understood to include the number itself.

[0053] The above description of the embodiments is intended to facilitate understanding and application of the present invention by those skilled in the art. It is apparent that those skilled in the art can readily make various modifications to the embodiments and apply the general principles described herein to other embodiments without requiring creative effort. Therefore, the present invention is not limited to the above-described embodiments. Improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A siphon drainage device for a sewage pool, characterized in that: The invention comprises a U-shaped siphon, a fixing bracket and an air extraction device, wherein the U-shaped siphon comprises a main channel and an auxiliary channel, the main channel comprises an inlet section, a connecting section and an outlet section connected to each other, the connecting section connects the inlet section and the outlet section, the inlet section is fixed to the inner wall of the sewage pool by the fixing bracket, the auxiliary channel is connected to the connecting section, the air extraction device comprises an air extraction mechanism and a one-way valve, the air extraction mechanism is connected to the auxiliary channel for extracting air into the auxiliary channel, the one-way valve is also connected to the auxiliary channel for making the auxiliary channel one-way. For conduction, the one-way valve includes a cavity, a baffle, a fixing nut and an air core. The fixing nut is arranged at the bottom of the cavity and is used to connect the auxiliary channel and the cavity. The air core is arranged at the top of the cavity. The baffle is connected to the bottom of the air core. An opening is provided on the baffle, and a closed air bag is provided in the opening; a swirl anti-blocking device is provided at the end of the water inlet section, and the swirl anti-blocking device includes a plurality of blades and a central disc. One end of the blade is connected to the inner wall of the water inlet section, and the other end is connected to the central disc. The plurality of blades are eccentrically arranged.

2. A sewage pool siphon drainage device according to claim 1, characterized in that: The closed airbag is made of rubber material.

3. A sewage pool siphon drainage device according to claim 1, characterized in that: A plurality of closed air bags are provided in the opening.

4. A sewage pool siphon drainage device according to claim 1, characterized in that: There are multiple openings, and the multiple openings are evenly arranged.

5. The sewage pool siphon drainage device according to claim 1, characterized in that: The blade has an offset ratio of 0.15-0.20 and a swirl angle of 20°-30°.

6. A sewage pool siphon drainage device according to claim 1, characterized in that: The air extraction mechanism includes a foot pedal, a lever, a piston rod, a piston head and a connecting rod. The piston head is arranged in the auxiliary channel. One end of the piston rod is connected to the piston head, and the other end is connected to the connecting rod. The other end of the connecting rod is connected to the lever, and the lever is connected to the foot pedal.

7. The sewage pool siphon drainage device according to claim 1, characterized in that: The water outlet section is inclined at 45°.

8. The sewage pool siphon drainage device according to claim 1, characterized in that: An automatic telescopic door is provided at the end of the water outlet section, the upper end of the automatic telescopic door is hinged to the end of the water outlet section, and a first magnet is provided at the lower part. The end of the water outlet section has a second magnet attracted to the first magnet.

9. A sewage pool siphon drainage device according to claim 8, characterized in that: The magnet distance between the first magnet and the second magnet is 1.5-3 cm, and the magnetic strength is ≥200 mT.

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