Domestic sewage treatment system

Abstract

The invention relates to the technical field of sewage treatment, and discloses a domestic sewage treatment system which comprises a water storage tank and a sewage discharge branch pipe, a water collection cavity is formed in the water storage tank, a water inlet used for collecting rainwater on a roof of a house is formed in the top end of the water storage tank, and the water inlet is communicated with the water collection cavity; a water outlet is formed in the bottom end of the water storage tank, the water outlet is communicated with a water inlet of the sewage discharge branch pipe, a water receiving hopper and a siphon mechanism are arranged in the water collection cavity, the water receiving hopper is rotatably arranged below the water inlet, and the siphon mechanism is communicated with the water outlet. According to the invention, rainwater can be collected, the collected rainwater is used for flushing the sewage discharge branch pipe, and residual sewage in the sewage discharge branch pipe is avoided, so that odor is prevented from overflowing from the sewage discharge branch pipe, the indoor living environment is guaranteed, mosquito breeding is avoided, and life health is guaranteed.

Description

Technical Field

[0001] The invention relates to a sewage treatment device, in particular to a domestic sewage treatment system. Background Art

[0002] At present, many rural areas have built domestic sewage pipe networks to discharge domestic sewage. Domestic sewage pipe networks generally include a main pipe and a branch pipe connecting the main pipe with the domestic sewage outlet. Domestic sewage is discharged through the branch pipe and the main pipe. At the same time, the main pipe is also connected to a sludge well to settle and store sediment to avoid clogging of the pipe network.

[0003] However, in reality, the flow volume in the sewage branch pipe is generally small and the flow rate is also low. In addition, rural houses are relatively dense and the excavation depth is limited, resulting in the design slope of the sewage branch pipe being mainly a gentle slope of 3-4‰. As a result, the suspended organic matter in the sewage branch pipe is easily deposited, resulting in sewage containing sediment and flocs remaining in the sewage branch pipe, which will not only cause odor to overflow from the sewage branch pipe, affecting the living environment, but also breed mosquitoes and affect health. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a domestic sewage treatment system, which can collect rainwater and use the collected rainwater to flush the sewage branch pipe, so as to avoid residual sewage in the sewage branch pipe, thereby preventing odor from overflowing from the sewage branch pipe, protecting the indoor living environment, avoiding the breeding of mosquitoes, and ensuring healthy life.

[0005] The technical solution adopted by the present invention to solve its technical problem is: A domestic sewage treatment system, comprising a water storage tank and a sewage branch pipe of a domestic sewage pipe network, wherein a water collecting chamber is arranged inside the water storage tank, a water inlet for collecting rainwater from a house roof is arranged at the top of the water storage tank, the water inlet is communicated with the water collecting chamber, a drain outlet is arranged at the bottom of the water storage tank, the drain outlet is communicated with the water inlet of the sewage branch pipe, a water receiving bucket and a siphon mechanism are arranged in the water collecting chamber, the water receiving bucket is rotatably arranged below the water inlet, and the siphon mechanism is communicated with the drain outlet; 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 pour the water in the water receiving bucket completely into the water storage tank, thereby replenishing the water storage tank and raising 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, thereby removing the sewage in the sewage branch pipe.

[0006] In some embodiments, the siphon mechanism includes a drain pipe arranged on the drain outlet and a siphon cover mounted on the outer wall of the drain pipe, a water inlet chamber 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 a liquid inlet, the exhaust pipe, the liquid inlet hole and the liquid inlet are all connected with the water inlet chamber, a siphon valve connected with the liquid inlet is arranged inside the drain pipe, the siphon valve is sealed and closed in a natural state, and the siphon valve is turned on when impacted by water flow.

[0007] In some embodiments, the siphon valve is made of elastic material, is in the shape of a tube with one end open, and its open end is connected to the liquid inlet. The bottom wall of the siphon valve is provided with a through hole, which is closed in a natural state; when impacted by water flow, the through hole expands to achieve conduction.

[0008] In some embodiments, the water collecting chamber is columnar, and the area of ​​its cross section is S. The distance between the upper end surface of the drain pipe and the bottom wall of the siphon cover is w. When the water collecting bucket is turned over, the volume of rainwater contained in it is V, and the following conditions are satisfied: V≥S*w; Among them, the value range of w is 1~2cm.

[0009] In some embodiments, the water collecting chamber is cylindrical, 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 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 they satisfy: 4S*h≥(v+0.415i)*π*d 2 *t; Among them, the value range of t is 20~30s, and v≥1.8 m / s.

[0010] In some embodiments, the sewage branch pipe includes a plurality of branch pipe units, two adjacent branch pipe units are connected by an elbow joint, the number of the elbow joints is n, the slope of the branch pipe unit adjacent to the drain outlet is i%, the inner diameter of the branch pipe unit is d, the water collecting chamber is columnar, 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 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 conditions are satisfied: 4S*h≥(v+0.415i-0.065n)*π*d 2 *t; Among them, the value range of t is 20~30 seconds, and v≥1.8 m / s.

[0011] In some embodiments, the inner diameter of the sewage branch pipe is d, and the length of the sewage branch pipe is L, and the following conditions are satisfied: 4S*h≥π*d 2 *L.

[0012] In some embodiments, a connecting rod is provided on the inner wall of the water tank, and two rotating shafts are 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 tank.

[0013] In some embodiments, 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 to the drain port, the water inlet pipe is connected to the water inlet, and the drain pipe is connected to the water collecting chamber.

[0014] In some embodiments, the water outlet pipe is provided with a water outlet channel extending through both ends thereof, and the cross-sectional area of ​​the water outlet channel gradually decreases in a direction away from the water storage tank.

[0015] A domestic sewage treatment system according to an embodiment of the present invention has the following beneficial effects compared with the prior art: a water storage tank is provided, and a water inlet for collecting rainwater from the roof of a house is provided at the top of the water storage tank, a drain outlet is provided at the bottom of the water storage tank, the drain outlet is communicated with the water inlet of the sewage branch pipe, and a water receiving bucket and a siphon mechanism are provided inside the water storage tank at the same time, and the siphon mechanism is communicated with the drain outlet, so that when it rains, rainwater from the roof of the house will enter the water receiving bucket from the water inlet to replenish the water storage tank, so that the water level in the water storage tank rises, and when the water level in the water storage tank reaches a critical value, the siphon effect is formed by triggering the siphon mechanism through the water receiving bucket, and the rainwater in the water storage tank is discharged through the drain outlet, so as to flush the sewage in the sewage branch pipe, thereby realizing the collection of rainwater, and using the collected rainwater to flush the sewage branch pipe, avoiding residual sewage in the sewage branch pipe, thereby preventing odor from overflowing from the sewage branch pipe, ensuring the indoor living environment, avoiding the breeding of mosquitoes, and ensuring healthy life. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the domestic sewage treatment system of the present invention.

[0017] Figure 2 It is a schematic diagram of stage 1 of the process of the siphon effect of the present invention.

[0018] Figure 3 It is a schematic diagram of the second stage of the siphon effect process of the present invention.

[0019] Figure 4 It is a schematic diagram of stage three of the process of the siphon effect of the present invention.

[0020] Figure 5 It is a schematic diagram of stage 4 of the process of the siphon effect of the present invention.

[0021] Figure 6 It is a schematic diagram of stage five of the process of the siphon effect of the present invention.

[0022] Figure 7 It is a cross-sectional view of a water storage tank of the present invention.

[0023] Wherein: 1- water storage tank, 11- water collection chamber, 12- water inlet, 13- drain outlet; 2-water receiving bucket; 3- siphon mechanism, 31- drain pipe, 32- siphon cover, 33- water inlet chamber, 34- exhaust pipe, 35- liquid inlet hole, 36- liquid inlet port, 37- siphon valve; 4-Connecting rod; 5- Rotating shaft; 6-water outlet pipe; 7-water inlet pipe; 8- Vent pipe; 9- Water level; 10-Sewage branch pipe. DETAILED DESCRIPTION

[0024] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0025] like Figure 1 As shown, a domestic sewage treatment system of a preferred embodiment of the present invention comprises 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. 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 collecting rainwater. The water collection chamber 11 is columnar, and its cross section can be circular, rectangular or other regular polygons, such as Figure 7 In the embodiment shown, the cross section of the water collection chamber is rectangular. The top of the water storage tank 1 is provided with a water inlet 12 for collecting rainwater from the roof of the house. The water inlet 12 is connected to the water collection chamber 11 to ensure that rainwater flows into the water collection chamber 11 from the water inlet 12. When collecting rainwater, a water inlet pipe 7 can be set on the water inlet 12. For buildings, the water inlet pipe 7 can be directly connected to the rainwater drainage pipe of the house; for bungalows, a collecting pipe can be set 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 from the roof.

[0026] The bottom end of the water storage tank 1 is provided with a drain port 13, and the drain port 13 is connected to the water inlet of the sewage branch pipe 10. The water collecting chamber 11 is provided with a water receiving bucket 2 and a siphon mechanism 3, and the siphon mechanism 3 is connected to the drain port 13. The water receiving bucket 2 is rotatably arranged below the water inlet 12. Specifically, the inner wall of the water storage tank 1 is provided with a connecting rod 4, and two rotating shafts 5 are oppositely arranged on both sides of the outer wall of the water receiving bucket 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 bucket 2 can rotate together with the rotating shaft 5.

[0027] Specifically, when collecting rainwater, rainwater flows into the water receiving bucket 2 from the water inlet 12, and when the water in the water receiving bucket 2 is full, it is turned over, and the water in the water receiving bucket 2 is completely poured into the water collecting chamber 11 of the water storage tank 1, so as to replenish the water in the water storage tank 1 and raise the water level in the water storage tank 1. When the water level in the water storage tank 1 reaches a critical value, the water receiving bucket 2 replenishes the water in the water storage tank 1 again, and the siphon mechanism 3 forms a siphon effect, and the rainwater in the water storage tank 1 is discharged through the drain port 13, so as to remove the sewage in the sewage branch pipe 10, thereby realizing the collection of rainwater, and using the collected rainwater to flush the sewage branch pipe 10, avoiding residual sewage in the sewage branch pipe 10, thereby preventing the sewage branch pipe 10 from overflowing with odor, protecting the indoor living environment, avoiding the breeding of mosquitoes, and ensuring a healthy life.

[0028] In addition, since the sewage branch pipe 10 is connected to the main pipe of the pipeline network, and the main pipe of the pipeline network is connected to the sludge pit, the sediment flushed in the sewage branch pipe 10 will be precipitated and stored in the sludge pit. The cleaning personnel only need to clean the sludge pit in the end, which greatly reduces the cleaning workload and thus reduces the pipeline network operation cost.

[0029] The water in the water receiving bucket 2 turns over when it is full, which utilizes the principle of center of gravity change. Specifically, when the water in the water receiving bucket 2 reaches a certain amount, the container will automatically turn over to make the water overflow. This structure is a prior art, such as a tilting device (tilted when there is less water, upright when the water is medium, and overturned when full), a tipping bucket rain gauge structure, etc.

[0030] As can be seen from the 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 bucket 2. To realize the above function, in this embodiment, the siphon mechanism 3 includes a drainage pipe 31 provided on the drainage port 13 and a siphon cover 32 sleeved on the outer wall of the drainage pipe 31, and the drainage pipe 31 and the siphon cover 32 are coaxially arranged. A water inlet cavity 33 is formed between the drainage pipe 31 and the siphon cover 32, and an exhaust pipe 34 is provided on the outer wall of the upper end of the siphon cover 32, and the exhaust end of the exhaust pipe 34 is located inside the water storage tank 1. The outer wall of the lower end of the siphon cover 32 is provided with a liquid inlet 35, the upper end of the drain pipe 31 is a liquid inlet 36, the exhaust pipe 34, the liquid inlet 35 and the liquid inlet 36 are all connected to the water inlet chamber 33, and the interior of the drain pipe 31 is provided with a siphon valve 37 connected to the liquid inlet 36. In the natural state, the siphon valve 37 is sealed and closed, and when impacted by water flow, the siphon valve 37 is turned on. That is, the present invention utilizes the natural adhesive softness of the siphon valve 37, combined with the rainwater flowing into the water inlet chamber 33 from the liquid inlet 35 to form a closed interval, and as the water level in the water inlet chamber 33 rises, the air in the water inlet chamber 33 is discharged through the exhaust pipe 34, and the water level in the water storage tank 1 reaches a critical value, when the water receiving bucket 2 replenishes the water storage tank 1 again, the siphon mechanism 3 forms a siphon effect.

[0031] In the present invention, the siphon valve 37 is made of elastic material, such as silica gel, and can be arranged in different forms, such as a cylindrical shape with one end open, and the open end is connected to the liquid inlet 36. The bottom wall of the siphon valve 37 is provided with a through hole, and when impacted by water flow, the through hole expands to achieve conduction. When the siphon valve 37 is not subjected to force, the through hole is closed.

[0032] The siphon valve 37 may also be composed of a plurality of valve pieces, the upper ends of which are connected to the liquid inlet 36 and are arranged in a ring shape, the lower ends of which may fit together (such as the one-way valve of an existing odor-proof floor drain), or the lower parts of which may be enclosed in a funnel shape.

[0033] Specifically, the process of collecting rainwater and generating a siphon effect in the present invention can be roughly divided into five stages: Phase 1: like Figure 2 As shown, the water tank 1 collects rainwater from the roof, and the rainwater enters the water receiving bucket 2 through the water inlet pipe 7. After being full of water, the water receiving bucket 2 rotates with the rotating shaft 5, and pours the water into the water tank 1 at one time, and the water level 9 in the water tank 1 rises; During the period when the water level 9 is raised, the water level 9 is lower than the height of the drain pipe 31, and the drain pipe 31 does not drain water; Phase 2: like Figure 3 As shown, water is stored in the water storage tank 1, and the water level 9 is continuously rising; 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, due to the gap between the inner wall of the siphon cover 32 and the upper end surface of the drain pipe 31, air is accumulated in the siphon cover 32, and the siphon effect cannot be formed. After a small amount of drainage, the water level 9 in the water inlet chamber 33 is flush with the height of the upper end surface of the drain pipe 31. The water receiving bucket 2 continues to receive water, and at this stage the water receiving bucket 2 is not full and does not drain water; Phase 3: like Figure 4 As shown, the water receiving bucket 2 continues to be filled with water and is poured into the water storage tank 1 at one time; The water level 9 in the water storage tank 1 is instantly increased to submerge the water inlet chamber 33 of the siphon cover 32, and the air in the siphon cover 32 is discharged from the exhaust pipe 34, and the rainwater in the siphon cover 32 is discharged from the drain pipe 31; After the air in the siphon cover 32 is discharged, a siphon effect is formed, and the rainwater in the water storage tank 1 flows into the water inlet cavity 33 through the liquid inlet hole 35, and then flows into the drain pipe 31 through the liquid inlet port 36, and finally is discharged into the sewage branch pipe 10 from the drain port 13, so that the sewage in the sewage branch pipe 10 is removed; Phase 4: like Figure 5 As shown, due to the siphon principle, the rainwater in the water storage tank 1 can be sucked and drained through the drain pipe 31 until the water level 9 of the water storage tank 1 is lower than the liquid inlet hole 35 of the siphon cover 32; Phase Five: like Figure 6 As shown, when the water level 9 in the water storage tank 1 is lower than the liquid inlet hole 35 of the siphon cover 32, air is sucked into the liquid inlet hole 35, and the siphon effect is destroyed, and the drainage ends; Return to stage 1 and repeat the process.

[0034] As can be seen from the above, in the present invention, the water level in the water tank 1 is firstly made to reach a critical value, and then the water is poured into the water tank 1 after the water receiving bucket 2 is filled with water again, so as to trigger the siphon mechanism 3. Therefore, the capacity of the water receiving bucket 2 is crucial and is the key to determining whether the siphon mechanism 3 can be triggered. At the same time, as can be seen from the above, the amount of water in the water receiving bucket 2 needs to make the liquid level in the water tank 1 at least rise by the height of the gap between the bottom wall of the siphon cover 32 and the upper end face of the drain pipe 31, so that the air in the siphon cover 32 can be completely discharged. Therefore, it can be determined that: like Figure 5As shown, if the distance between the upper end surface of the drain pipe 31 and the bottom wall of the siphon cover 32 is w, the cross-sectional area of ​​the water collecting chamber 11 is S (as shown in FIG. Figure 7 The area of ​​the middle water-containing part in the water receiving bucket 2 is V, and the volume of rainwater contained in the water receiving bucket 2 when the water receiving bucket 2 is turned over (that is, the maximum water content of the water receiving bucket 2 before turning over) is V, and the following is satisfied: V ≥ S*w; 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.

[0035] In this embodiment, in order to achieve a better flushing effect on the sewage branch pipe 10, both the flushing speed and the flushing time have an important influence. Existing research shows that for one-way flushing, when the speed of rainwater at the water inlet of the sewage branch pipe 10 reaches 1.8 m / s or more, a better flushing effect can be achieved. At the same time, the present invention combines multiple tests and obtains that under the premise of ensuring a better flushing speed, a flushing time of 20 to 30 seconds can achieve complete flushing, such as 21s, 22s, 23s, 24s, 25s, 26s, 27s, 28s, 29s, etc., or any value or any range between any two of the above values. In the specific selection, if the flushing speed is relatively large, a smaller flushing time can be appropriately selected; if the flushing speed is selected to be slightly smaller, the flushing time can be appropriately increased.

[0036] After the flushing time and flushing speed are basically determined, since the diameter of the sewage branch pipe 10 is fixed, the required water volume can also be determined, and it is necessary to ensure that the total amount of rainwater that can flow out of the water storage tank 1 is not less than the flushing water volume for one time. At the same time, the sewage branch pipe 10 generally has a certain slope, and the sewage branch pipe 10 may have a bend during actual use, so the capacity of the water storage tank 1 may be slightly different for different situations, specifically: 1. When the drainage branch pipe 10 is a whole, if the cross-sectional area of ​​the water collecting chamber 11 is S, the distance between the upper end surface of the siphon cover 32 and the highest point of the liquid inlet hole 35 is h, the slope of the drainage branch pipe 10 is i%, the inner diameter of the drainage branch pipe 10 is d, the flushing time is t, and the speed of rainwater at the water inlet of the drainage branch pipe 10 is v, then the following conditions are satisfied: 4S*h≥(v+0.415i)*π*d 2 *t; Among them, the value range of t is 20~30s, such as 21s, 22s, 23s, 24s, 25s, 26s, 27s, 28s, 29s, etc.; v≥1.8 m / s, preferably 2m / s.

[0037] 2. When the sewage branch pipe 10 has a bend, the sewage branch pipe 10 includes a plurality of branch pipe units, and 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 port 13 is i%, the inner diameter of the branch pipe unit is d, the water collecting chamber 11 is columnar, and the area of ​​its cross section is S, the distance between the upper end surface of the siphon cover 32 and the highest point of the liquid inlet hole 35 is h, the flushing time is t, and the speed of rainwater at the water inlet of the sewage branch pipe 10 is v, then the following conditions are satisfied: 4S*h≥(v+0.415i-0.065n)*π*d 2 *t; The value range of t is 20~30 seconds, such as 21s, 22s, 23s, 24s, 25s, 26s, 27s, 28s, 29s, etc.; v≥1.8 m / s, preferably 2m / s.

[0038] 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 as a whole using S*h, but it should be noted that it is necessary to ensure that the height of the rainwater in the water storage tank 1 can ensure that the speed of the rainwater at the water inlet of the sewage branch pipe 10 reaches v. Of course, if the above speed cannot be achieved by relying solely on the gravity of the rainwater, an outlet pipe 6 can also be set on the outer wall of the water storage tank, and the outlet pipe 6 is connected to the drain port 13, and a booster device is set on the outlet pipe 6 to ensure that the speed of the rainwater at the water inlet of the sewage branch pipe 10 reaches v. Alternatively, the outlet pipe 6 is set as a reducer to increase the water outlet speed. When specifically set, the outlet pipe 6 is provided with a water outlet channel running through both ends thereof, and the cross-sectional area of ​​the outlet channel gradually decreases in the direction away from the water storage tank, thereby ensuring the water outlet speed of the outlet pipe 6.

[0039] 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: 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: 4S*h≥π*d 2 *L, L is generally greater than 10 meters.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] In summary, the present invention realizes flushing of the sewage branch pipe 10 of the sewage network by reasonably collecting rainwater and forming an automatic flushing device through the system. The sewage containing sediment and flocs accumulated in the pipeline is flushed into the sludge pit by instantaneous and large-volume flushing, thereby avoiding residual sewage in the sewage branch pipe 10, thereby preventing odor from overflowing from the sewage branch pipe 10, ensuring the indoor living environment, avoiding the breeding of mosquitoes, ensuring healthy life, and effectively alleviating the blockage of the sewage branch pipe 10, thereby extending the service life of the sewage network.

[0045] It should be noted that in the present invention, the terms "installed", "set", "provided with", "connected", 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 a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. Unless otherwise specified, the meaning of "plurality" is two or more.

[0046] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection 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 pour the water in the water receiving bucket completely into the water storage tank, thereby replenishing the water storage tank and raising 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, thereby removing the sewage in the sewage branch pipe.

2. The domestic sewage treatment system according to claim 1, characterized in that: The siphon mechanism includes a drain pipe arranged on the drain outlet and a siphon cover sleeved on the outer wall of the drain pipe, a water inlet chamber 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 a liquid inlet, the exhaust pipe, the liquid inlet hole and the liquid inlet are all connected with the water inlet chamber, a siphon valve connected with the liquid inlet is arranged inside the drain pipe, the siphon valve is sealed and closed in a natural state, and the siphon valve is turned on 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 claim 2, characterized in that: The water collecting chamber is columnar, and its cross-sectional area is S. The distance between the upper end surface of the drainage pipe and the bottom wall of the siphon cover is w. When the water collecting bucket is turned over, the volume of rainwater contained in it is V, and the following conditions are satisfied: V≥S*w; Among them, the value range of w is 1~2cm.

5. The domestic sewage treatment system according to claim 2, characterized in that: The water collecting chamber is columnar, and its cross-sectional area is S, the distance between the upper end surface of the siphon cover and the highest point of the liquid inlet 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 they satisfy: 4S*h≥(v+0.415i)*π*d 2 *t; Among them, the value range of t is 20~30s, and v≥1.8 m / s.

6. The domestic sewage treatment system according to claim 2, characterized in that: The sewage branch pipe includes a plurality of branch pipe units, and 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%, the inner diameter of the branch pipe unit is d, 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 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 conditions are satisfied: 4S*h≥(v+0.415i-0.065n)*π*d 2 *t: Among them, the value range of t is 20~30 seconds, and v≥1.8 m / s.

7. The domestic sewage treatment system according to claim 5 or 6, characterized in that: The inner diameter of the sewage branch pipe is d, and the length of the sewage branch pipe is L, and the following conditions are satisfied: 4S*h≥π*d 2 *L.

8. The domestic sewage treatment system according to any one of claims 1 to 6, 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.

9. The domestic sewage treatment system according to any one of claims 1 to 6, 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.

10. The domestic sewage treatment system according to claim 9, 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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