CN211080512U - Backflow pool device using siphon drainage - Google Patents
Backflow pool device using siphon drainage Download PDFInfo
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- CN211080512U CN211080512U CN201921794121.2U CN201921794121U CN211080512U CN 211080512 U CN211080512 U CN 211080512U CN 201921794121 U CN201921794121 U CN 201921794121U CN 211080512 U CN211080512 U CN 211080512U
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Abstract
A backflow pool device applying siphon drainage comprises a backflow pool, a receiving pool, a siphon and an accident handling system, wherein the backflow pool and the receiving pool are separated by a shared retaining wall, a water inlet pipe is arranged on the side wall of the backflow pool, the lower part of the receiving pool is provided with an overflow weir by the retaining wall, the overflow weir comprises a bottom plate, one side of the bottom plate is fixed at the lower part of the retaining wall, the rest edges of the bottom plate are provided with upward barriers, one end of the siphon is arranged at the bottom of the backflow pool, and the other end of the siphon penetrates through the upper part of the retaining wall and; the accident handling system comprises an exhaust pipe, a flushing water pipe, an exhaust valve and a flushing water valve, wherein the part of the siphon pipe penetrating through the retaining wall is respectively communicated with the exhaust pipe and the flushing water pipe, and the exhaust valve and the flushing water valve are respectively arranged on the exhaust pipe and the flushing water pipe. The utility model discloses can solve the problem of depositing water in backward flow pond need can only flow back to flow, the high technical problem of construction cost through promoting.
Description
Technical Field
The utility model belongs to the sewage treatment field relates to an use backward flow pond device of siphon drainage.
Background
Because the discharge standard of national and local sewage treatment plants is increasingly strict, especially the high standard requirement of SS, the effluent of the secondary sedimentation tank of the traditional sewage plant hardly meets the requirement, the application of the filter tank in the sewage treatment plant is increasingly wide, however, the filter tank needs to be regularly washed for preventing the filter tank from being blocked, and because the washing time is short and the strength is high, if the washing water is directly refluxed, the great impact is caused to the sewage treatment plant, the washing water needs to be collected and then uniformly refluxed to the flow.
Based on the above, the backflow water pool is transported. The return water tank is mainly used for collecting backwashing water of the filter tank and uniformly sending the backwashing water back to the process for treatment. Because the filter is positioned at the tail end of the process, the loss of a filter head is large, the embedding depth of the backflow water tank is deep, and meanwhile, the water level of the backflow water tank is continuously changed due to the amount of stored water, so that the water cannot automatically flow back to the process, and the water needs to be lifted and then sent to the backflow process, thereby not only increasing the engineering investment and the operating cost, but also causing the waste of energy. If the position of the backflow water tank can be reasonably selected, the construction cost of the backflow water tank is reduced, meanwhile, the back washing water is uniformly sent back to the flow on the premise of not wasting energy, and the operating cost of the filter tank system is further reduced.
Disclosure of Invention
An object of the utility model is to provide an use backward flow pond device of siphon drainage to solve the water deposit in backward flow pond and need can only flow back to flow, the high technical problem of construction cost through promoting.
The utility model adopts the following technical scheme:
a backflow pool device applying siphon drainage comprises a backflow pool, a receiving pool, a siphon and an accident handling system, wherein the backflow pool and the receiving pool are separated by a shared retaining wall, a water inlet pipe is arranged on the side wall of the backflow pool, the lower part of the receiving pool is provided with an overflow weir by the retaining wall, the overflow weir comprises a bottom plate, one side of the bottom plate is fixed at the lower part of the retaining wall, upward barriers are arranged at the other edges of the bottom plate, one end of the siphon is arranged at the bottom of the backflow pool, and the other end of the siphon penetrates through the upper part of the retaining wall and extends into the bottom of the overflow weir;
the accident handling system comprises an exhaust pipe, a flushing water pipe, an exhaust valve and a flushing water valve, wherein the siphon pipe penetrates through the part of the retaining wall to be communicated with the exhaust pipe and the flushing water pipe respectively, and the exhaust valve and the flushing water valve are arranged on the exhaust pipe and the flushing water pipe respectively.
The siphon is in an inverted U shape and comprises a first vertical pipe, a horizontal pipe and a second vertical pipe which are sequentially communicated, wherein the bottom end of the first vertical pipe is communicated with the bottom of the reflux water pool, and the bottom end of the second vertical pipe is communicated with the bottom of the overflow weir; the two ends of the horizontal pipe penetrate out of the retaining wall, and the two ends of the horizontal pipe are respectively communicated with the flushing water pipe and the exhaust pipe.
The horizontal cross section of the receiving pool is in a convex shape, two opposite convex shoulders are respectively provided with a rectangular backflow pool, and the horizontal cross sections of the backflow pool and the receiving pool form a square shape.
The bottom of the backflow pool is smeared with slopes to the retaining wall, the slope is 1-3%, and the bottom of the retaining wall is in a low-lying position.
The installation height of a horizontal pipe of the siphon is higher than the top of the overflow weir; the top of the overflow weir is higher than the operating water level of the receiving pool and lower than the top of the receiving pool.
The siphon pipes are arranged in parallel in a plurality; the horizontal pipes of the siphons are connected to the same flushing water valve through a plurality of flushing water pipes and connected to the same exhaust valve through a plurality of exhaust pipes.
An operation method of a backflow pool device using siphon drainage comprises the following steps:
1) opening the water inlet pipe to feed water, enabling the water level of the backflow pool to be between the designed high water level and the top of an overflow weir in the water receiving pool, and reserving water in the overflow weir;
2) closing an exhaust valve and opening a flushing water valve, filling the siphon with manual water filling, enabling two ends of the siphon to be respectively positioned below the water level of the overflow weir and the water level of the bottom of the backflow pool to form a siphoning effect, and then closing the flushing water valve;
3) the water level of the receiving pool is lower than the weir crest of the overflow weir to continuously and normally operate: the water in the reflux pool continuously enters the overflow weir through the siphon pipe and overflows and falls into the receiving pool;
a. when the water level of the receiving pool reaches the top of the overflow weir, the receiving pool can be judged to have a fault, the exhaust valve needs to be opened, the siphon is emptied of the stored water to destroy the siphon action, and the operations of the steps 1) and 2) are repeated after the accident is eliminated;
b. when the water level of the backflow water pool is higher than the designed high water level, the siphon pipe needs to be checked, whether siphon action damage or the siphon pipe blockage phenomenon exists is judged, and the operations of the steps 1) and 2) are directly repeated for the siphon action damage; for the blockage of the siphon, opening the flushing water valve for flushing, removing the blockage, and then repeating the operations of the steps 1) and 2);
c. when the water level of the backflow pool is lower than the water level of the weir crest of the overflow weir, the siphon action is automatically destroyed, the water is continuously discharged through the water inlet pipe, and after the water level of the backflow pool rises, the operations of the steps 1) and 2) are repeated.
When the siphon is flushed in the step 3), the flow speed of flushing water is 5-15 m/s, and the flushing time is 5-10 min.
Compared with the backflow pool used in the existing sewage plant, the sewage treatment plant has the following advantages:
1. the backflow pool adopts the siphon to drain water, so that energy consumption is not needed, the operation cost can be effectively reduced, energy is saved, and consumption is reduced;
2. the water discharge of siphon drainage is influenced by the water level of the drainage pool, the water discharge is large when the water level of the drainage pool is high, and the water discharge changes within a certain range, so that the increase of the actual regulation and storage time of the backflow pool is facilitated, and the impact on the process flow is avoided;
3. under the influence of the water level of the filter tank, the backflow water tank is generally built together with a coarse grating with the lowest height of a sewage plant, the coarse grating and a water inlet pump room (the position of the receiving water tank is the same as that of the receiving water tank in a plan view) are generally arranged in a convex shape, the backflow water tank is built together with the backflow water tank in a square shape, the land is intensive, extra land is not needed, and the investment is reduced;
4. the high-efficiency and low-consumption regulation and storage of the filter tank backflow water and backflow are realized.
Drawings
Fig. 1 is a top view of the present invention;
fig. 2 is a cross-sectional view taken along the line a-a of fig. 1 in accordance with the present invention;
fig. 3 is a cross-sectional view of the present invention taken at the position B-B of fig. 1;
FIG. 4 is a diagram of the relationship of the level of the joint building positions of the embodiment;
fig. 5 is a top view of the present invention when combined with a coarse grid and intake pump house.
The reference numbers: 1-water inlet pipe, 2-reflux water tank, 3-a-first vertical pipe, 3-b-horizontal pipe, 3-c-second vertical pipe, 4-overflow weir, 5-receiving water tank, 6-a-exhaust pipe, 6-b-exhaust valve, 6-c-flushing water pipe, 6-d-flushing water valve, 5-a-coarse grid and water inlet pump room.
Detailed Description
The following examples are given for the purpose of clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Other variations and modifications of the present invention will be apparent to those of ordinary skill in the art based on the following description, and it is within the spirit of the present invention that such variations and modifications are within the scope of the present invention.
A backflow pool device applying siphon drainage comprises a backflow pool 2, a receiving pool 5, a siphon 3 and an accident handling system, wherein the backflow pool 2 and the receiving pool 5 are separated by a shared retaining wall, a water inlet pipe 1 is arranged on a side wall of the backflow pool 2, the lower part of the receiving pool 5 is provided with an overflow weir 4 by the retaining wall, the overflow weir 4 comprises a bottom plate, one side of the bottom plate is fixed at the lower part of the retaining wall, upward barriers are arranged at the other edges of the retaining wall, one end of the siphon 3 is arranged at the bottom of the backflow pool 2, and the other end of the siphon passes through the upper part of the retaining wall and extends into the bottom of the overflow weir 4;
the accident handling system comprises an exhaust pipe 6-a, a flushing water pipe 6-c, an exhaust valve 6-b and a flushing water valve 6-d, wherein the part of the siphon pipe 3 penetrating through the retaining wall is respectively communicated with the exhaust pipe 6-a and the flushing water pipe 6-c, and the exhaust pipe 6-a and the flushing water pipe 6-c are respectively provided with the exhaust valve 6-b and the flushing water valve 6-d.
The siphon 3 is in an inverted U shape and comprises a first vertical pipe 3-a, a horizontal pipe 3-b and a second vertical pipe 3-c which are sequentially communicated, the bottom end of the first vertical pipe 3-a is communicated with the bottom of the backflow water tank 2, and the bottom end of the second vertical pipe 3-c is communicated with the bottom of the overflow weir 4; two ends of the horizontal pipe 3-b penetrate out of the retaining wall, and the two ends are respectively communicated with the flushing water pipe 6-c and the exhaust pipe 6-a.
The horizontal cross section of the receiving pool 5 is convex, two opposite convex shoulders are respectively provided with a rectangular backflow pool 2, and the horizontal cross sections of the backflow pool 2 and the receiving pool 5 form a square shape.
2 bottoms of the pools in the backflow pool are smeared to the retaining wall, the gradient is 1-3%, and the bottom of the retaining wall is in a low-lying position.
The installation height of the horizontal pipe 3-b of the siphon 3 is higher than the weir top of the overflow weir 4; the top of the overflow weir 4 is higher than the operating water level of the receiving water pool 5 and lower than the top of the receiving water pool 5.
The siphon pipes 3 are arranged in parallel; the horizontal pipes 3-b of a plurality of siphon pipes 3 are connected to the same flush water valve 6-d through a plurality of flush water pipes 6-c and to the same exhaust valve 6-b through a plurality of exhaust pipes 6-a.
An operation method of a backflow pool device using siphon drainage comprises the following steps:
1) opening the water inlet pipe 1 to feed water, enabling the water level of the backflow water pool 2 to be between the designed high water level and the weir top of an overflow weir 4 in a receiving water pool 5, and reserving water in the overflow weir 4;
2) closing the exhaust valve 6-b and opening a flushing water valve 6-d, filling the siphon 3 with manual water filling, enabling two ends of the siphon 3 to be respectively positioned below the water level of the overflow weir 4 and the water level of the bottom of the reflux pool 2 to form a siphoning effect, and then closing the flushing water valve 6-d;
3) the water level of the receiving pool 5 is lower than the crest of the overflow weir 4 and continuously and normally operates: the water in the backflow water tank 2 continuously enters an overflow weir 4 through a siphon 3 and overflows and falls into a receiving water tank 5;
a. when the water level of the receiving pool 5 reaches the top of the overflow weir 4, the receiving pool 5 can be judged to have a fault, the exhaust valve 6-b needs to be opened, the siphon action is destroyed by emptying the water stored in the siphon 3, and the operations of the steps 1) and 2) are repeated after the accident is eliminated;
b. when the water level of the return water tank 2 is higher than the designed high water level, the siphon pipe 3 needs to be checked to judge whether siphon action damage or the blockage phenomenon of the siphon pipe 3 exists, and the operations of the steps 1) and 2) are directly repeated for the siphon action damage; for the blockage of the siphon 3, opening the flushing water valve 6-d for flushing, removing the blockage, and then repeating the operations of the steps 1) and 2);
c. when the water level of the backflow pool 2 is lower than the water level of the top of the overflow weir 4, the siphon action will be automatically destroyed, the water inlet pipe 1 continuously drains water, and after the water level of the backflow pool 2 rises, the operations of the steps 1) and 2) are repeated.
When the siphon 3 is flushed in the step 3), the flow speed of flushing water is 5-15 m/s, and the flushing time is 5-10 min.
The utility model discloses in, at first need monomer in the rational selection flow as receiving the pond, it should match with backward flow pond elevation relation, later according to elevation relation and backward flow pond volume calculation siphon pipe diameter and installation elevation to overflow weir height is confirmed to the theory, realizes that the siphon of backward flow pond storage water discharges.
The utility model discloses in the example, select thick grid intake well and carried out the concrete description as receiving the pond, nevertheless the utility model discloses do not confine to thick grid intake well as receiving the pond, all height relation match's flow monomer all can regard as the utility model discloses a receive the pond.
When the utility model discloses build the completion back, under the normal condition, the backward flow pond of siphon drainage need not extra consumption energy can automatic operation, and is safe convenient.
The utility model can be used for sewage treatment plants with filters with large water discharge and is matched with filters, such as sand filter process, biological filter process, deep bed filter process and the like.
The present invention is further explained with reference to fig. 1, 2 and 3. The utility model discloses a backflow pool device, which comprises a water inlet pipe 1, a backflow pool 2, a siphon pipe 3, an overflow weir 4, a receiving pool 5 and an accident handling system; the siphon 3 consists of a first vertical pipe 3-a, a horizontal pipe 3-b and a second vertical pipe 3-c which are communicated in sequence; the accident handling system comprises an exhaust pipe 6-a, an exhaust valve 6-b, a flushing water pipe 6-c and a flushing water valve 6-d which are all arranged on the siphon 3; the overflow weir 4 is arranged on the inner side wall of the receiving water pool 5; the water inlet pipe 1 is communicated with the backflow water tank 2 on the side wall of the backflow water tank 2; the reflux water tank 2 is communicated with the overflow weir 4 at the opposite side of the water inlet pipe 1 through a siphon pipe 3; the siphon 3 is in an inverted U shape, a first vertical pipe 3-a is communicated with the bottom of the backflow water tank 2, and a second vertical pipe 3-b is communicated with the bottom of the overflow weir 4; the flushing water pipe 6-c is communicated with the siphon horizontal pipe 3-b and is positioned at one side of the backflow water tank 2, meanwhile, a flushing water valve 6-d is arranged on the flushing water pipe 6-c, and pressurized water is accessed when the siphon 3 is blocked to clean the siphon pipeline; the exhaust pipe 6-a is communicated with the siphon horizontal pipe 3-b and is positioned at one side of the receiving water pool 5, meanwhile, the exhaust pipe 6-a is provided with an exhaust valve 6-b, and when the return water pool 2 breaks down and needs to stop draining, the exhaust valve 6-b is opened for siphon damage; the gradient of the bottom of the backflow pool 2 is 1-3%, the slope is towards a siphon, and the retention time of the inflow water in the backflow pool is 3-8 h; the siphon horizontal pipe 3-b is installed at a height higher than the top of the overflow weir 4, and the top of the overflow weir 4 is higher than the operating water level of the receiving pool 5 to prevent backflow.
A return pool device operation method using siphon drainage, first filling siphon 3 in the first operation, and closing exhaust valve 6-b and flushing water valve 6-d to form siphon action; when the water level of the backflow water tank 2 is between the designed high water level and the top of the overflow weir 4 in normal operation, the water level of the receiving water tank 5 is lower than the top of the overflow weir 4, when the water level of the receiving water tank 5 reaches the top of the overflow weir 4, the receiving water tank 5 breaks down, an exhaust valve is opened for 3-5 min, water stored in a vent siphon 3 is used for destroying siphoning, drainage is stopped, and the operation in the primary operation is repeated after the accident is eliminated; when the water level of the backflow water tank 2 is higher than the designed high water level, the siphon 3 needs to be checked, whether siphon damage or siphon 3 blockage exists or not is judged, a flushing water valve 6-d is opened, the siphon 3 is flushed, the flushing water flow rate is controlled to be 5-15 m/s, the flushing time is 5-10 min, blockages are removed, and then the operation in the primary operation is repeated; when the water level of the backflow pool 2 is lower than the top water level of the overflow weir 4, siphoning is automatically destroyed, and after the water level of the backflow pool rises, primary operation is repeated to restore siphoning.
The utility model discloses can the thick grid intake well as receiving the pond, also can expand to other elevations on the flow and match the position as receiving the pond.
Examples
Design scale of 8 km for a sewage plant3And d, designing effluent quality to execute the B standard of Water pollutant discharge Standard of urban Sewage treatment plant (DB11890-2012) by adopting a process flow of pretreatment, a biological tank, a secondary sedimentation tank, a biological filter and a cloth filter, and arranging a return water tank applying siphon drainage for collecting backwashing water of the biological filter and uniformly discharging the backwashing water.
FIG. 4 is a plan view of the embodiment, and FIG. 5 is a plan view of the embodiment. A backflow pool using siphon drainage, a coarse grid and a lift pump room are jointly built, and the backflow pool comprises a DN1000 water inlet pipe 1 and an effective volume of 1314m3The system comprises a reflux water tank 2, a DN150 siphon pipe 3, a 1.5m × 1.0.0 m overflow weir 4, a coarse grid, a water inlet pump room 5-a and an accident handling system 6, wherein the DN150 siphon pipe 3 consists of a first vertical pipe 3-a, a horizontal pipe 3-b and a second vertical pipe 3-c which are communicated in sequenceForming; the accident handling system 6 comprises a DN20 exhaust pipe 6-a, a DN20 exhaust valve 6-b, a DN20 flushing water pipe 6-c and a DN20 flushing water valve 6-d which are all arranged on the DN150 siphon 3; the overflow weir 4 is arranged on the inner side walls of the coarse grating and the water inlet pump room 5-a; the water inlet pipe 1 is communicated with the backflow water tank 2 on the side wall of the backflow water tank 2; the reflux water tank 2 is communicated with the overflow weir 4 at the opposite side of the water inlet pipe 1 through a siphon pipe 3; the siphon 3 is in an inverted U shape, a first vertical pipe 3-a is communicated with the bottom of the backflow water tank 2, and a second vertical pipe 3-b is communicated with the bottom of the overflow weir 4; the flushing water pipe 6-c is communicated with the siphon horizontal pipe 3-b and is positioned at one side of the backflow water tank 2, meanwhile, a flushing water valve 6-d is arranged on the flushing water pipe 6-c, and pressurized water is accessed when the siphon 3 is blocked to clean the siphon pipeline; the exhaust pipe 6-a is communicated with the siphon horizontal pipe 3-b and is positioned at one side of the receiving water pool 5, meanwhile, the exhaust pipe 6-a is provided with an exhaust valve 6-b, and when the return water pool 2 breaks down and needs to stop draining, the exhaust valve 6-b is opened for siphon damage; the gradient of the bottom of the backflow pool 2 is 1%, the slope siphon is inclined, and the retention time of the inlet water in the backflow pool is 6.5 hours; the siphon horizontal pipe 3-b is arranged at a height 4.9m higher than the top of the overflow weir 4, and the top of the overflow weir 4 is 2.3m higher than the running water level of the receiving pool 5, so as to prevent backflow.
The operation method of the return pool device using siphon drainage is that inlet water enters the return pool 2 through the inlet pipe 1, sequentially passes through the siphon first vertical pipe 3-a, the siphon horizontal pipe 3-b and the siphon second vertical pipe 3-c, enters the overflow weir 4, and overflows into the coarse grating and the inlet pump house 5-a after passing through the top of the overflow weir 4 along with the rise of the water level. The process is carried out spontaneously, energy is not consumed, the operation cost can be effectively reduced, energy is saved, and consumption is reduced; with the change of the water level of the return water tank, the siphon drainage amount changes, and the change range is limited, thereby being beneficial to the increase of the actual regulation and storage time of the return water tank and not causing impact on the process flow; when the backflow water pool or the receiving water pool breaks down and needs to stop draining, an exhaust valve 6-a 3-5 min is opened, the siphon action is destroyed along with the entering of air when the water stored in the emptying siphon 3 is destroyed, draining is stopped, after the fault is eliminated, the siphon 3 is filled by manual flushing, the exhaust valve 6-a is closed, and siphon draining is recovered; when one or more parts of the first vertical pipe 3-a, the horizontal pipe 3-b and the second vertical pipe 3-c of the siphon pipe are blocked, the flushing water valve 6-c is opened to flush the siphon pipe 3, the flow rate of the flushing water is controlled to be 5-15 m/s, the flushing time is 5-10 min, the blocking materials are removed, the siphon pipe 3 is filled with the flushing water manually after the flushing is finished, the exhaust valve 6-a is closed, and siphon drainage is recovered.
Claims (6)
1. The utility model provides an use backward flow pond device of siphon drainage, its characterized in that, includes backward flow pond (2), receives pond (5), siphon (3), accident handling system, backward flow pond (2) and receipt pond (5) separate through the sharing barricade, set up inlet tube (1) on the side wall of backward flow pond (2), receive pond (5) lower part and lean on the barricade to set up overflow weir (4), overflow weir (4) include the bottom plate, bottom plate one side is fixed barricade lower part, all the other edges set up ascending fender, siphon (3) one end sets up at backward flow pond (2) bottom of the pool, another passes on the barricade upper portion and stretches into overflow weir (4) bottom of the pool;
the accident handling system comprises an exhaust pipe (6-a), a flushing water pipe (6-c), an exhaust valve (6-b) and a flushing water valve (6-d), wherein the siphon (3) penetrates through the part of the retaining wall to be communicated with the exhaust pipe (6-a) and the flushing water pipe (6-c), and the exhaust pipe (6-a) and the flushing water pipe (6-c) are respectively provided with the exhaust valve (6-b) and the flushing water valve (6-d).
2. The backflow pool device using siphon drainage as claimed in claim 1, wherein the siphon (3) is in an inverted U shape and comprises a first vertical pipe (3-a), a horizontal pipe (3-b) and a second vertical pipe (3-c) which are sequentially communicated, the bottom end of the first vertical pipe (3-a) is communicated with the bottom of the backflow pool (2), and the bottom end of the second vertical pipe (3-c) is communicated with the bottom of the overflow weir (4); two ends of the horizontal pipe (3-b) penetrate out of the retaining wall, and the two ends of the horizontal pipe are respectively communicated with the flushing water pipe (6-c) and the exhaust pipe (6-a).
3. A reflux pool device using siphon drainage as claimed in claim 2, characterized in that the horizontal cross-section of the receiving pool (5) is convex, and two rectangular reflux pools (2) are respectively arranged at two opposite shoulder positions, and the horizontal cross-sections of the reflux pools (2) and the receiving pool (5) are square.
4. The backflow pool device applying siphon drainage as claimed in claim 1, characterized in that the pool bottom of the backflow pool (2) is sloped to the retaining wall with a slope of 1-3% so that the retaining wall bottom is a low-lying part.
5. A backflow pool device using siphon drainage according to claim 1, characterized in that the horizontal pipe (3-b) of the siphon pipe (3) is installed at a height higher than the top of the overflow weir (4); the weir top of the overflow weir (4) is higher than the running water level of the receiving water pool (5) and lower than the pool top of the receiving water pool (5).
6. A backflow pool device using siphon discharge as claimed in claim 1, characterized in that said siphon pipes (3) are arranged in plurality side by side; the horizontal pipes (3-b) of a plurality of siphon pipes (3) are connected to the same flushing water valve (6-d) through a plurality of flushing water pipes (6-c) and to the same exhaust valve (6-b) through a plurality of exhaust pipes (6-a).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921794121.2U CN211080512U (en) | 2019-10-24 | 2019-10-24 | Backflow pool device using siphon drainage |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921794121.2U CN211080512U (en) | 2019-10-24 | 2019-10-24 | Backflow pool device using siphon drainage |
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| Publication Number | Publication Date |
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| CN211080512U true CN211080512U (en) | 2020-07-24 |
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| CN201921794121.2U Active CN211080512U (en) | 2019-10-24 | 2019-10-24 | Backflow pool device using siphon drainage |
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