A domestic sewage treatment system

Abstract

The present invention relates to the technical field of sewage treatment, and discloses a domestic sewage treatment system, which includes a water storage tank and a sewage discharge branch pipe. A water collection chamber is provided inside the water storage tank. An inlet for collecting rainwater from the roof of a house is provided at the top of the water storage tank, and the inlet is communicated with the water collection chamber. A drain outlet is provided at the bottom of the water storage tank, and the drain outlet is communicated with the inlet of the sewage discharge branch pipe. A water receiving hopper and a siphon mechanism are provided inside the water collection chamber. The water receiving hopper is rotatably arranged below the inlet, and the siphon mechanism is communicated with the drain outlet. The present invention can collect rainwater and use the collected rainwater to flush the sewage discharge branch pipe, avoiding the residual sewage in the sewage discharge branch pipe, thereby preventing the odor from overflowing in the sewage discharge branch pipe, ensuring the indoor living environment, avoiding the breeding of mosquitoes, and ensuring the living health.

Description

Technical Field

[0001] The present invention relates to a sewage treatment device, and particularly to a domestic sewage treatment system. Background Art

[0002] At present, domestic sewage pipe networks have been built in many rural areas to achieve the discharge of domestic sewage. The domestic sewage pipe network generally includes a main pipe and a sewage discharge branch pipe connecting the main pipe and the domestic sewage discharge port of a household. Domestic sewage is discharged through the sewage discharge branch pipe and the main pipe. At the same time, a sedimentation well is also connected to the main pipe, which can achieve sedimentation and storage of sediment to avoid blockage of the pipe network.

[0003] However, in reality, the flow discharge in the sewage discharge branch pipe is generally small and the flow velocity is also low. In addition, rural houses are relatively dense and the excavation depth is limited, resulting in the design slope of the sewage discharge branch pipe mainly being a gentle slope of 3 - 4‰. As a result, the suspended organic matter in the sewage discharge branch pipe is likely to deposit, leaving sewage containing sediment and flocs in the sewage discharge branch pipe. This will not only cause foul smell to overflow from the sewage discharge branch pipe, affecting the living environment, but also breed mosquitoes, affecting living health. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides a domestic sewage treatment system that can collect rainwater and use the collected rainwater to flush the sewage discharge branch pipe, avoiding the remaining sewage in the sewage discharge branch pipe, thereby preventing foul smell from overflowing from the sewage discharge branch pipe, ensuring the indoor living environment, avoiding breeding mosquitoes, and ensuring living health.

[0005] The technical solution adopted by the present invention to solve its technical problems is as follows:

[0006] A domestic sewage treatment system includes a water storage tank and a sewage discharge branch pipe of a domestic sewage pipe network. A water collection cavity is provided inside the water storage tank. An inlet for collecting rainwater from the roof of a house is provided at the top of the water storage tank. The inlet is communicated with the water collection cavity. A drain port is provided at the bottom of the water storage tank. The drain port is communicated with the inlet of the sewage discharge branch pipe. A water receiving hopper and a siphon mechanism are provided in the water collection cavity. The water receiving hopper is rotatably arranged below the inlet. The siphon mechanism is communicated with the drain port;

[0007] Rainwater flows into the water receiving hopper from the inlet. When the water in the water receiving hopper is full, it will flip and pour all the water in the water receiving hopper into the water storage tank, realizing the replenishment of the water storage tank and causing the water level in the water storage tank to rise. When the water level in the water storage tank reaches the critical value and the water receiving hopper replenishes the water storage tank again, the siphon mechanism forms a siphon effect, discharging the rainwater in the water storage tank through the drain port to realize the removal of the sewage in the sewage discharge branch pipe.

[0008] In some embodiments, the siphon mechanism includes a drain pipe provided on the drain opening and a siphon cover sleeved on the outer wall of the drain pipe. An inlet chamber is formed between the drain pipe and the siphon cover. An exhaust pipe is provided on the outer wall at the upper end of the siphon cover, and a liquid inlet hole is provided on the outer wall at the lower end of the siphon cover. The upper end of the drain pipe is a liquid inlet. The exhaust pipe, the liquid inlet hole and the liquid inlet are all communicated with the inlet chamber. A siphon valve is provided inside the drain pipe and is communicated with the liquid inlet. In the natural state, the siphon valve is sealed and closed, and when impacted by water flow, the siphon valve is conducted.

[0009] In some embodiments, the siphon valve is made of an elastic material, is in a cylindrical shape with one end open, and its open end is connected to the liquid inlet. A through hole is provided on the bottom wall of the siphon valve. In the natural state, the through hole is closed; when impacted by water flow, the through hole expands to achieve conduction.

[0010] In some embodiments, the water collection chamber is columnar, the cross-sectional area thereof is S, the distance between the upper end face of the drain pipe and the bottom wall of the siphon cover is w, and the volume of rainwater contained inside when the water receiving hopper is turned over is V. Then the following is satisfied: V≥S*w;

[0011] Wherein, the value range of w is 1 to 2 cm.

[0012] In some embodiments, the water collection chamber is columnar, the cross-sectional area thereof is S, the distance between the upper end face of the siphon cover and the highest point of the liquid inlet hole is h, the slope of the sewage branch pipe is i%, the inner diameter of the sewage branch pipe is d, the flushing time is t, and the speed of rainwater at the water inlet of the sewage branch pipe is v. Then the following is satisfied:

[0013] 4S*h≥(v + 0.415i)*π*d 2 *t;

[0014] Wherein, the value range of t is 20 to 30 s, and v≥1.8 m / s.

[0015] In some embodiments, the sewage branch pipe includes a plurality of branch pipe units. Adjacent two branch pipe units are connected by an elbow joint. The number of elbow joints is n. The slope of the branch pipe unit adjacent to the drain opening is i%. The inner diameter of the branch pipe unit is d. The water collection chamber is columnar, the cross-sectional area thereof is S, the distance between the upper end face of the siphon cover and the highest point of the liquid inlet hole is h, the flushing time is t, and the speed of rainwater at the water inlet of the sewage branch pipe is v. Then the following is satisfied:

[0016] 4S*h≥(v + 0.415i - 0.065n)*π*d 2 *t;

[0017] Among them, the value range of t is 20 to 30 seconds, and v ≥ 1.8 m / s.

[0018] In some embodiments, the inner diameter of the sewage branch pipe is d, and the length of the sewage branch pipe is L, and they satisfy:

[0019] 4S*h ≥ π*d 2 *L.

[0020] In some embodiments, a connecting rod is provided on the inner wall of the water storage tank, and two rotating shafts are oppositely provided on both sides of the outer wall of the water receiving hopper. One of the rotating shafts is rotatably connected to the connecting rod, and the other rotating shaft is rotatably connected to the inner wall of the water storage tank.

[0021] In some embodiments, a water outlet pipe, a water inlet pipe, and a drain pipe are provided on the outer wall of the water storage tank. The water outlet pipe is communicated with the drain port, the water inlet pipe is communicated with the water inlet, and the drain pipe is communicated with the water collecting cavity.

[0022] In some embodiments, a water outlet channel penetrating through both ends is provided inside the water outlet pipe, and in the direction away from the water storage tank, the cross-sectional area of the water outlet channel gradually decreases.

[0023] Compared with the prior art, a domestic sewage treatment system according to an embodiment of the present invention has the beneficial effects that: by providing a water storage tank, a water inlet for collecting rainwater from the roof of a house is provided at the top of the water storage tank, a drain port is provided at the bottom of the water storage tank, the drain port is communicated with the water inlet of the sewage branch pipe, and at the same time, a water receiving hopper and a siphon mechanism are provided inside the water storage tank, and the siphon mechanism is communicated with the drain port. Thus, when it rains, the rainwater on the roof of the house will enter the water receiving hopper through the water inlet to replenish the water storage tank, causing the water level in the water storage tank to rise. When the water level in the water storage tank reaches the critical value, the siphon mechanism is triggered by the water receiving hopper to form a siphon effect, and the rainwater in the water storage tank is discharged through the drain port to realize the flushing of the sewage in the sewage branch pipe. Thereby, the collection of rainwater is realized, and the collected rainwater is used to flush the sewage branch pipe, avoiding the residual sewage in the sewage branch pipe, thereby preventing the odor from overflowing in the sewage branch pipe, ensuring the indoor living environment, avoiding the breeding of mosquitoes, and ensuring the living health. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic structural diagram of the domestic sewage treatment system of the present invention.

[0025] Figure 2 It is a schematic diagram of the first stage during the process of the siphon effect occurring in the present invention.

[0026] Figure 3Schematic diagram of the second stage in the process of the siphon effect occurring in the present invention.

[0027] Figure 4 Schematic diagram of the third stage in the process of the siphon effect occurring in the present invention.

[0028] Figure 5 Schematic diagram of the fourth stage in the process of the siphon effect occurring in the present invention.

[0029] Figure 6 Schematic diagram of the fifth stage in the process of the siphon effect occurring in the present invention.

[0030] Figure 7 Cross-sectional view of the water storage tank of the present invention.

[0031] Wherein: 1 - water storage tank, 11 - water collection chamber, 12 - water inlet, 13 - drain outlet;

[0032] 2 - water receiving hopper;

[0033] 3 - siphon mechanism, 31 - drain pipe, 32 - siphon hood, 33 - water inlet chamber, 34 - exhaust pipe, 35 - liquid inlet hole, 36 - liquid inlet, 37 - siphon valve;

[0034] 4 - connecting rod;

[0035] 5 - rotating shaft;

[0036] 6 - outlet pipe;

[0037] 7 - inlet pipe;

[0038] 8 - vent pipe;

[0039] 9 - water level;

[0040] 10 - sewage branch pipe. Specific embodiments

[0041] The following combines the drawings and embodiments to further describe in detail the specific embodiments of the present invention. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0042] As Figure 1 shown, a domestic sewage treatment system according to a preferred embodiment of the present invention includes a water storage tank 1 and a sewage branch pipe 10 of a domestic sewage pipe network. The sewage branch pipe 10 contains domestic sewage, and the present invention treats the sewage in the sewage branch pipe 10. Specifically, a water collection chamber 11 is provided inside the water storage tank 1 for containing rainwater. The water collection chamber 11 is columnar, and its cross-section can be circular, rectangular or other regular polygons, such as Figure 7In the illustrated embodiment, the cross-section of the water collection chamber is rectangular. The top end of the water storage tank 1 is provided with a water inlet 12 for collecting rainwater from the roof of the house, and the water inlet 12 is communicated with the water collection chamber 11 to ensure that rainwater flows into the water collection chamber 11 from the water inlet 12. Specifically, when collecting rainwater, a water inlet pipe 7 can be arranged on the water inlet 12. For a building, the water inlet pipe 7 can be directly connected to the rainwater drainage pipe of the house; for a bungalow, a collecting pipe can be arranged at the lower end of the roof on each side of the bungalow, and the water outlet end of the collecting pipe is connected to the water inlet pipe 7, so as to realize the collection of rainwater on the roof.

[0043] The bottom end of the water storage tank 1 is provided with a drain port 13, and the drain port 13 is communicated with the water inlet of the sewage branch pipe 10. A water receiving hopper 2 and a siphon mechanism 3 are arranged in the water collection chamber 11, and the siphon mechanism 3 is communicated with the drain port 13. The water receiving hopper 2 is rotatably arranged below the water inlet 12. Specifically, a connecting rod 4 is arranged on the inner wall of the water storage tank 1, and two rotating shafts 5 are oppositely arranged on both sides of the outer wall of the water receiving hopper 2. One of the rotating shafts 5 is rotatably connected to the connecting rod 4, and the other rotating shaft 5 is rotatably connected to the inner wall of the water storage tank 1, and the water receiving hopper 2 can rotate together with the rotating shaft 5.

[0044] When specifically collecting rainwater, rainwater flows from the water inlet 12 into the water receiving hopper 2, and when the water in the water receiving hopper 2 is full, it will turn over, pouring all the water in the water receiving hopper 2 into the water collection chamber 11 of the water storage tank 1, realizing the replenishment of the water storage tank 1 and raising the water level in the water storage tank 1. When the water level in the water storage tank 1 reaches the critical value and the water receiving hopper 2 replenishes the water storage tank 1 again, the siphon mechanism 3 forms a siphon effect, discharging the rainwater in the water storage tank 1 through the drain port 13, realizing the cleaning of the sewage in the sewage branch pipe 10. Thus, the collection of rainwater is realized, and the collected rainwater is used to flush the sewage branch pipe 10, avoiding the residual sewage in the sewage branch pipe 10, preventing the overflow of odor in the sewage branch pipe 10, ensuring the indoor living environment, avoiding the breeding of mosquitoes, and ensuring the living health.

[0045] In addition, since the sewage branch pipe 10 is connected to the main pipe network, and the main pipe network is connected to the sedimentation well, the sediments flushed in the sewage branch pipe 10 will precipitate and be stored in the sedimentation well. Finally, the cleaning personnel only need to clean the sedimentation well, greatly reducing the cleaning workload and thus reducing the operation cost of the pipe network.

[0046] The turning over of the water receiving hopper 2 when the water in it is full utilizes the principle of center of gravity change. Specifically, when the water in the water receiving hopper 2 reaches a certain amount, the container will automatically turn over to make the water overflow. Such a structure is prior art, such as the tilting vessel (tipping when the water is less, upright when the water is medium, and overturning when the water is full), the structure of a tipping bucket rain gauge, etc.

[0047] As described above, the present invention realizes the non-powered automatic flushing of the sewage branch pipe 10 through the siphon mechanism 3, and triggers the siphon mechanism 3 through the water receiving hopper 2. To achieve the above functions, in this embodiment, the siphon mechanism 3 includes a drain pipe 31 provided on the drain port 13 and a siphon cover 32 sleeved on the outer wall of the drain pipe 31, and the drain pipe 31 and the siphon cover 32 are coaxially arranged. An inlet chamber 33 is formed between the drain pipe 31 and the siphon cover 32. An exhaust pipe 34 is provided on the outer wall of the upper end of the siphon cover 32, and the outlet end of the exhaust pipe 34 is located inside the water storage tank 1. A liquid inlet hole 35 is provided on the outer wall of the lower end of the siphon cover 32. The upper end of the drain pipe 31 is a liquid inlet 36. The exhaust pipe 34, the liquid inlet hole 35 and the liquid inlet 36 are all communicated with the inlet chamber 33. A siphon valve 37 communicated with the liquid inlet 36 is provided inside the drain pipe 31. In the natural state, the siphon valve 37 is hermetically closed, and when impacted by water flow, the siphon valve 37 is conducted. That is, the present invention utilizes the natural adhesive soft property of the siphon valve 37 to form a closed interval in combination with the rainwater flowing into the inlet chamber 33 from the liquid inlet hole 35. And as the water level in the inlet chamber 33 rises, the air in the inlet chamber 33 is discharged through the exhaust pipe 34, and when the water level in the water storage tank 1 reaches the critical value and the water receiving hopper 2 replenishes the water storage tank 1 again, the siphon mechanism 3 forms a siphon effect.

[0048] In the present invention, the siphon valve 37 is made of an elastic material, such as silica gel. It can have different setting forms. For example, it is a cylindrical shape with one end open, and its open end is connected to the liquid inlet 36. A through hole is provided on the bottom wall of the siphon valve 37. When impacted by water flow, the through hole expands to achieve conduction. When the siphon valve 37 is not stressed, the through hole is closed.

[0049] The siphon valve 37 can also be composed of a plurality of valve pieces. The upper ends of the plurality of valve pieces are connected to the liquid inlet 36 and are arranged in a ring. The lower ends of the plurality of valve pieces can be mutually attached (such as the one-way valve of an existing anti-odor floor drain), or the lower parts of the plurality of valve pieces can enclose a funnel shape.

[0050] Specifically, the process of rainwater collection and siphon effect occurrence in the present invention can be roughly divided into five stages:

[0051] Stage one:

[0052] As Figure 2 shown, the water storage tank 1 collects roof rainwater. The rainwater enters the water receiving hopper 2 through the water inlet pipe 7. After being full of water, the water receiving hopper 2 rotates along with the rotating shaft 5 and pours the water into the water storage tank 1 at one time, and the water level 9 in the water storage tank 1 rises;

[0053] During the rising of water level 9, the water level 9 is lower than the height of the drain pipe 31, and the drain pipe 31 does not drain water.

[0054] Phase Two:

[0055] As Figure 3 shown, water is stored in the water storage tank 1 and the water level 9 continuously rises;

[0056] After the water level 9 rises to the height of the liquid inlet 36 of the drain pipe 31, a small amount of excess water is discharged. However, since there is a gap between the inner wall of the siphon hood 32 and the upper end face of the drain pipe 31, air accumulates in the siphon hood 32 and a siphon effect cannot be formed. After a small amount of water is drained, the water level 9 in the water inlet chamber 33 is flush with the upper end face of the drain pipe 31.

[0057] The water receiving hopper 2 continues to receive water, and during this phase, the water receiving hopper 2 does not drain water when it is not full.

[0058] Phase Three:

[0059] As Figure 4 shown, the water receiving hopper 2 continues to be filled with water and is poured into the water storage tank 1 at once;

[0060] The water level 9 in the water storage tank 1 instantaneously rises, submerging the water inlet chamber 33 of the siphon hood 32. The air in the siphon hood 32 is discharged from the exhaust pipe 34, and the rainwater in the siphon hood 32 is discharged from the drain pipe 31;

[0061] After the air in the siphon hood 32 is discharged, a siphon effect is formed. The rainwater in the water storage tank 1 flows into the water inlet chamber 33 through the liquid inlet hole 35, then flows into the drain pipe 31 through the liquid inlet 36, and finally is discharged into the sewage branch pipe 10 from the drain port 13, realizing the cleaning of the sewage in the sewage branch pipe 10;

[0062] Phase Four:

[0063] As Figure 5 shown, due to the siphon principle, the rainwater in the water storage tank 1 can be continuously sucked and drained through the drain pipe 31 until the water level 9 in the water storage tank 1 is lower than the liquid inlet hole 35 of the siphon hood 32;

[0064] Phase Five:

[0065] As Figure 6 shown, when the water level 9 in the water storage tank 1 is lower than the liquid inlet hole 35 of the siphon hood 32, air is sucked into the liquid inlet hole 35. At this time, the siphon effect is destroyed and the drainage ends;

[0066] It returns to Phase One again and cycles in turn.

[0067] As described above, in the present invention, the water level in the water storage tank 1 is first brought to a critical value, and then water is poured into the water storage tank 1 after the water receiving hopper 2 is filled again to trigger the siphon mechanism 3. Therefore, the capacity of the water receiving hopper 2 is crucial and is the key to determining whether the siphon mechanism 3 can be triggered. At the same time, as described above, the amount of water in the water receiving hopper 2 needs to raise the liquid level in the water storage tank 1 by at least the height of the gap between the bottom wall of the siphon hood 32 and the upper end face of the drain pipe 31 to completely exhaust the air in the siphon hood 32. Therefore, it can be determined that:

[0068] As Figure 5 shown, if the distance between the upper end face of the drain pipe 31 and the bottom wall of the siphon hood 32 is w, and the cross-sectional area of the water collection chamber 11 is S (such as the area of the middle water-containing part in Figure 7 ), when the water receiving hopper 2 is turned over, the volume of the rainwater contained therein (i.e., the maximum water storage capacity of the water receiving hopper 2 before turning over) is V, then the following relationship is satisfied: V≥S*w;

[0069] Among them, the value range of w is 1-2 cm, such as 1.1 cm, 1.2 cm, 1.3 cm, 1.4 cm, 1.5 cm, 1.6 cm, 1.7 cm, 1.8 cm, 1.9 cm, etc., or any value or any range between any two of the above values.

[0070] In this embodiment, to achieve a better flushing effect on the sewage branch pipe 10, both the flushing speed and the flushing time have important effects. Existing research shows that for one-way flushing, when the speed of rainwater at the water inlet of the sewage branch pipe 10 reaches more than 1.8 m / s, a better flushing effect can be achieved. At the same time, through multiple experiments in the present invention, it is obtained that on the premise of ensuring a better flushing speed, a flushing time of 20-30 s can achieve complete flushing, such as 21 s, 22 s, 23 s, 24 s, 25 s, 26 s, 27 s, 28 s, 29 s, etc., or any value or any range between any two of the above values. When making a specific selection, if the flushing speed is relatively large, a relatively small flushing time can be appropriately selected; if the flushing speed is selected to be slightly smaller, the flushing time can be appropriately increased.

[0071] After the flushing time and the flushing speed are basically determined, since the diameter of the sewage branch pipe 10 is fixed, the required amount of water can also be determined, and it is necessary to ensure that the total amount of rainwater flowing out of the water storage tank 1 is not less than the water consumption for one flushing. At the same time, the sewage branch pipe 10 generally has a certain slope, and the sewage branch pipe 10 may have bends during actual use. Therefore, for different situations, the capacity of the water storage tank 1 can have a slight difference. Specifically:

[0072] 1. When the sewage branch pipe 10 is a whole piece, if the cross-sectional area of the water collection chamber 11 is S, the distance between the upper end face of the siphon cover 32 and the highest point of the liquid inlet hole 35 is h, the slope of the sewage branch pipe 10 is i%, the inner diameter of the sewage branch pipe 10 is d, the flushing time is t, and the velocity of rainwater at the water inlet of the sewage branch pipe 10 is v, then the following relationship is satisfied:

[0073] 4S * h ≥ (v + 0.415i) * π * d 2 * t;

[0074] Among them, the value range of t is 20 - 30 s, such as 21 s, 22 s, 23 s, 24 s, 25 s, 26 s, 27 s, 28 s, 29 s, etc.; v ≥ 1.8 m / s, preferably 2 m / s.

[0075] 2. When there are bends in the sewage branch pipe 10, the sewage branch pipe 10 includes multiple branch pipe units, and two adjacent branch pipe units are connected by elbow joints. The number of elbow joints is n (pieces). The slope of the branch pipe unit adjacent to the drain port 13 is i%, the inner diameter of the branch pipe unit is d, the water collection chamber 11 is columnar, and its cross-sectional area is S. The distance between the upper end face of the siphon cover 32 and the highest point of the liquid inlet hole 35 is h, the flushing time is t, and the velocity of rainwater at the water inlet of the sewage branch pipe 10 is v. Then the following relationship is satisfied:

[0076] 4S * h ≥ (v + 0.415i - 0.065n) * π * d 2 * t;

[0077] Among them, the value range of t is 20 - 30 seconds, such as 21 s, 22 s, 23 s, 24 s, 25 s, 26 s, 27 s, 28 s, 29 s, etc.; v ≥ 1.8 m / s, preferably 2 m / s.

[0078] In actual selection, first select the values of v and t, and then determine the values of S and h. The values of S and h are generally determined with S * h as a whole. However, it should be noted that it is necessary to ensure that the height of rainwater in the water storage tank 1 can ensure that the velocity of rainwater at the water inlet of the sewage branch pipe 10 reaches v. Of course, if the above velocity cannot be achieved only by the gravity of rainwater, a water outlet pipe 6 can also be provided on the outer wall of the water storage tank. The water outlet pipe 6 is communicated with the drain port 13, and a pressurization device is provided on the water outlet pipe 6 to ensure that the velocity of rainwater at the water inlet of the sewage branch pipe 10 reaches v. Or the water outlet pipe 6 is set as a variable diameter pipe to increase the water outlet velocity. Specifically, when setting, there is a water outlet channel running through both ends inside the water outlet pipe 6, and in the direction away from the water storage tank, the cross-sectional area of the water outlet channel gradually decreases, so as to ensure the water outlet velocity of the water outlet pipe 6.

[0079] In addition, under normal circumstances, the length of the sewage branch pipe 10 is not very long, generally about 5 to 10 meters, so the values ​​of S and h obtained according to the above conditions can ensure that the sewage branch pipe 10 is completely flushed. However, there are some special cases in actual use, that is, the length of the sewage branch pipe 10 is relatively large. At this time, the total amount of rainwater in the water storage tank 1 set according to the values ​​of S and h obtained according to the above conditions may not ensure that the sewage branch pipe 10 is completely flushed. At this time, the values ​​of S and h are also determined according to the length of the sewage branch pipe 10. Specifically:

[0080] The inner diameter of the sewage branch pipe 10 is d, and the length of the sewage branch pipe 10 is L, and the following conditions are satisfied:

[0081] 4S*h≥π*d 2 *L, L is generally greater than 10 meters.

[0082] When setting it specifically, you can calculate (v+0.415i)*π*d 2 *t or (v+0.415i-0.065n)*π*d 2 *t, and with π*d 2 *L values ​​are compared, and the largest value is taken as the standard to determine the final value of S*h.

[0083] It should be noted that, when the sewage branch pipe 10 is composed of a plurality of branch pipe units, the length of the sewage branch pipe 10 is the length of its center line.

[0084] In this embodiment, the outer wall of the water tank 1 is also provided with a drain pipe 8. When there is no need to flush the sewage branch pipe 10, rainwater in the water tank 1 can be drained through the drain pipe 8, and the water inlet pipe 7 can be sealed to make the interior of the water tank 1 completely sealed, thereby avoiding internal corrosion of the water tank 1 and extending the service life of the water tank 1.

[0085] In this embodiment, the lowest point of the water receiving bucket 2 (in the natural state or in the tilted state) should be higher than the upper end surface of the siphon cover 32, which can prevent the rainwater in the water storage tank 1 from interfering with the water receiving bucket 2 during its rotation, and ensure that the water area in the water receiving bucket 2 can be completely poured out instantly, so that the water level 9 in the water storage tank 1 is instantly increased.

[0086] In summary, the present invention reasonably collects rainwater and forms an automatic flushing device through this system to flush the sewage discharge branch pipe 10 of the sewage pipe network. By using instantaneous and large-volume flushing, the sewage containing sediment and flocs accumulated in the pipe is flushed into the sedimentation well, avoiding the residual sewage in the sewage discharge branch pipe 10, thereby preventing the odor from overflowing in the sewage discharge branch pipe 10, ensuring the indoor living environment, avoiding the breeding of mosquitoes, ensuring the living health, effectively slowing down the blockage of the sewage discharge branch pipe 10, and extending the service life of the sewage pipe network.

[0087] It should be noted that in the present invention, the terms "installation", "setting", "provided with", "connection", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there can be internal communication between two devices, components, or parts. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Unless otherwise specified, the meaning of "a plurality" is two or more.

[0088] The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and substitutions can still be made, and these improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A domestic sewage treatment system, characterized in that: It includes a water storage tank and a sewage branch pipe of a domestic sewage pipe network, wherein a water collection chamber is arranged inside the water storage tank, a water inlet for collecting rainwater from a roof of a house is arranged at the top of the water storage tank, the water inlet is connected to the water collection chamber, a drain is arranged at the bottom of the water storage tank, the drain is connected to the water inlet of the sewage branch pipe, a water receiving bucket and a siphon mechanism are arranged in the water collection chamber, the water receiving bucket is rotatably arranged below the water inlet, and the siphon mechanism is connected to the drain; Rainwater flows into the water receiving bucket from the water inlet, and when the water in the water receiving bucket is full, it turns over to completely pour the water in the water receiving bucket into the water storage tank, so as to replenish the water in the water storage tank and raise the water level in the water storage tank. When the water level in the water storage tank reaches a critical value, the water receiving bucket replenishes the water in the water storage tank again, and the siphon mechanism forms a siphon effect to discharge the rainwater in the water storage tank through the drain port, so as to remove the sewage in the sewage branch pipe. The siphon mechanism comprises a drain pipe arranged on the drain outlet and a siphon cover sleeved on the outer wall of the drain pipe, a water inlet cavity is formed between the drain pipe and the siphon cover, an exhaust pipe is arranged on the outer wall of the upper end of the siphon cover, a liquid inlet hole is arranged on the outer wall of the lower end of the siphon cover, the upper end of the drain pipe is the liquid inlet, and the exhaust pipe, the liquid inlet hole and the liquid inlet are all connected with the water inlet cavity; The water collecting chamber is columnar, and the area of ​​its cross section is S. The distance between the upper end surface of the siphon cover and the highest point of the liquid inlet hole is h. The flushing time is t. The speed of rainwater at the water inlet of the sewage branch pipe is v, and the value range of t is 20 to 30 seconds, and v ≥ 1.8 m / s. If the slope of the sewage branch pipe is i%, and the inner diameter of the sewage branch pipe is d, then the following conditions are satisfied: 4S*h≥(v+0.415i)*π*d 2 *t; If the sewage branch pipe includes a plurality of branch pipe units, two adjacent branch pipe units are connected by elbow joints, the number of elbow joints is n, the slope of the branch pipe unit adjacent to the drain outlet is i%, and the inner diameter of the branch pipe unit is d, then the following conditions are satisfied: 4S*h≥(v+0.415i-0.065n)*π*d 2 *t: Or the length of the sewage branch pipe is L, and L ≥ 10 meters, then 4S*h ≥ π*d 2 *L; The distance between the upper end surface of the drainage pipe and the bottom wall of the siphon cover is w, and the volume of rainwater contained in the water receiving bucket when it turns over is V, and the following condition is satisfied: V≥S*w; Among them, the value range of w is 1~2cm.

2. The domestic sewage treatment system according to claim 1, characterized in that: A siphon valve connected to the liquid inlet is provided inside the drain pipe. The siphon valve is sealed and closed in a natural state, and is opened when impacted by water flow.

3. The domestic sewage treatment system according to claim 2, characterized in that: The siphon valve is made of elastic material, and is in the shape of a tube with one end open, and the open end is connected to the liquid inlet. A through hole is provided on the bottom wall of the siphon valve, and the through hole is closed in a natural state; when impacted by water flow, the through hole expands to achieve conduction.

4. The domestic sewage treatment system according to any one of claims 1 to 3, characterized in that: A connecting rod is provided on the inner wall of the water storage tank, and two rotating shafts are relatively provided on both sides of the outer wall of the water receiving bucket, one of the rotating shafts is rotatably connected to the connecting rod, and the other rotating shaft is rotatably connected to the inner wall of the water storage tank.

5. The domestic sewage treatment system according to any one of claims 1 to 3, characterized in that: The outer wall of the water storage tank is provided with a water outlet pipe, a water inlet pipe and a drain pipe, the water outlet pipe is connected with the drain port, the water inlet pipe is connected with the water inlet, and the drain pipe is connected with the water collecting chamber.

6. The domestic sewage treatment system according to claim 5, characterized in that: The water outlet pipe is provided with a water outlet channel running through both ends thereof, and the cross-sectional area of ​​the water outlet channel gradually decreases in the direction away from the water storage tank.

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