CN112973205B - Pneumatic sand extracting system of horizontal-flow type aeration grit chamber - Google Patents
Pneumatic sand extracting system of horizontal-flow type aeration grit chamber Download PDFInfo
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- CN112973205B CN112973205B CN202110464204.0A CN202110464204A CN112973205B CN 112973205 B CN112973205 B CN 112973205B CN 202110464204 A CN202110464204 A CN 202110464204A CN 112973205 B CN112973205 B CN 112973205B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/02—Settling tanks with single outlets for the separated liquid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/24—Feed or discharge mechanisms for settling tanks
- B01D21/245—Discharge mechanisms for the sediments
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Abstract
The invention relates to a sand extraction device of an advection aeration tank, which comprises an above-water unit and a sand suction unit, wherein the above-water unit comprises a main flow sand collecting pipe and a main flow air supply pipe, the sand suction unit comprises a branch flow sand discharge pipe, a branch flow air supply pipe and an outer pipe sleeve, the main flow sand collecting pipe and the main flow air supply pipe are respectively arranged on the wall surface at the top of the aeration tank in a transverse mode, the top end of the branch flow sand discharge pipe is communicated with the main flow sand collecting pipe, the bottom end of the branch flow sand discharge pipe is inserted into the bottom of the tank, the top end of the branch flow air supply pipe is communicated with the side surface of the main flow air supply pipe, the bottom end of the branch flow air supply pipe is inserted into the sewage below water surface, the part of the branch flow air supply pipe below the water surface is communicated with the side wall of the branch flow sand discharge pipe, the outer pipe sleeve internally sleeves the branch flow sand discharge pipe and the branch flow air supply pipe, a plurality of supporting pieces are fixedly connected with the inner wall of the outer pipe, the supporting pieces are contacted with the pipe and reduce the deformation degree of the branch flow sand discharge pipe caused by water impact, and all the components of the sand suction unit are respectively fixed at proper positions through connecting pieces so as to avoid uncontrolled free transportation of the sand suction unit And (6) moving.
Description
Technical Field
The invention belongs to the field of sewage treatment, and relates to a system for removing settled gravel and solid particles in a horizontal flow type aeration grit chamber, which is a pretreatment stage of a sewage treatment plant.
Background
The existing horizontal-flow type aeration grit chamber sand removal system adopts a sand suction pump pumping mode to remove sand, the sand suction pump is suspended and spanned on a sand suction bridge, the sand suction bridge travels along the water flow direction of the grit chamber according to time intervals, and when the bridge travels, the sand suction pump is started to realize intermittent sand discharge. The sand suction bridge is a stainless steel bridge body, the truss structure is complex, the cost is high, a plurality of auxiliary systems are required to work simultaneously, such as travelling wheels, travelling rails, travelling cables and the like, a plurality of limiting mechanisms are required to be arranged at two ends of the sand suction bridge, the control of an electric appliance is complex, and the number of faults is large; in the actual use process, the problems of impeller abrasion, impeller blockage and the like easily occur when the impeller of the sand suction pump works, and the running reliability is poor; because the whole aeration grit chamber only has one sand suction bridge and sand suction pump, after equipment failure, the water inlet of the tank can only be stopped and maintained, and because the potential failure points of the equipment are too many, the equipment maintenance amount and the maintenance workload are large, the manpower and the financial resources are wasted, the resources of a water treatment unit are seriously restricted, and the normal production is influenced.
Disclosure of Invention
In order to solve the technical problem, a pneumatic sand extraction system of a horizontal flow aeration tank is provided. The technical scheme is that the device comprises an above-water unit and a sand suction unit, wherein the above-water unit comprises a main flow sand collecting pipe and a main flow air supply pipe, the sand suction unit comprises a branch flow sand discharge pipe, a branch flow air supply pipe and an outer pipe sleeve, a plurality of sand suction units can be connected to one above-water unit and support the same, the main flow sand collecting pipe and the main flow air supply pipe are respectively transversely arranged on the wall surface at the top of an aeration tank, the top end of the branch flow sand discharge pipe is communicated with the main flow sand collecting pipe, the bottom end of the branch flow sand discharge pipe is inserted into the bottom of the tank and is matched with a sand collecting groove at the bottom of the tank at intervals, the top end of the branch flow air supply pipe is communicated with the side surface of the main flow air supply pipe, the bottom end of the branch flow air supply pipe is inserted into the sewage below the water surface, the part of the branch flow air supply pipe below the water surface is communicated with the side wall of the branch flow sand discharge pipe, the outer pipe sleeve sleeves the branch flow sand discharge pipe and the branch flow sand discharge pipe are sleeved in the outer pipe and extend to the end part close to the bottom end of the branch flow sand discharge pipe, a plurality of the outer pipe is fixedly connected with a plurality of the outer pipe, the supporting piece is in contact with the wall of the branch sand discharge pipe and reduces the deformation degree of the branch sand discharge pipe caused by water flow impact, and all components of the sand suction unit are fixed at proper positions through the connecting pieces respectively so as to avoid uncontrolled free movement.
On the basis of the technical scheme, the water unit is sleeved with the safety sleeve, and the side wall of the safety sleeve is respectively provided with a through hole through which the water supply unit and the sand suction unit penetrate.
On the basis of the technical scheme, the sand suction device further comprises a lifting unit, the connecting piece for fixing the sand suction unit is a support, the sand suction unit is fixed on the side wall of the safety sleeve through the support, and the lifting unit is fixed on the wall surface at the top of the aeration tank and drives the safety sleeve to move up and down.
On the basis of the technical scheme, the device also comprises a resistance reducing unit, wherein the resistance reducing unit comprises a baffle, the baffle is arranged on the side wall of the direction in which the outer sleeve of the pipe just faces the sewage, and the baffle is in an outward convex shape capable of reducing water flow resistance and used for reducing the impact force of sewage water flow on the outer sleeve of the pipe.
On the basis of the technical scheme, the connecting piece for fixing the outer sleeve of the pipe is a reinforcing component, the reinforcing component comprises a frame mechanism and a connecting rod, the frame mechanism is installed on the side wall of the outer sleeve of the pipe, and two ends of the connecting rod are respectively connected with the frame mechanism and the wall surface of the aeration tank.
On the basis of the cardinality according to the dry basis, the side wall of the sleeve outside the pipe is provided with an accessory connecting plate along the length direction, and the resistance reducing unit and the reinforcing component are respectively installed on the accessory connecting plate through threaded connection.
On the basis of the technical scheme, the outward protruding shape is a sharp shape similar to a roof slope, so that a space is formed between the baffle and the accessory connecting plate, and the bottom of the space is opened up and down.
On the basis of the technical scheme, the buoyancy unit comprises a permeable cage formed by enclosing a grating plate and a floating body with buoyancy and placed in the permeable cage, and the buoyancy unit is installed on the accessory connecting plate and is positioned in an interval between the accessory connecting plate and the baffle plate to provide buoyancy for the outer sleeve of the pipe.
On the basis of the technical scheme, the lifting unit adopts a hydraulic lifting mechanism to control the lifting of the safety sleeve.
Has the advantages that: compare and inhale the scheme that the sand pump removed the sand of inhaling, this scheme adopts the aeration principle clearance grit water, and it is effectual to go out the sand, and the volume of taking out water still less, and the volume of going out the sand is bigger, and simple to operate maintains more laborsaving, and the structure can standardize be convenient for promote, and the present advection aeration tank of adaptation that simultaneously also can be very good carries out very little transformation alright this scheme of application.
Adopt elevating system whole to drive unit on water and inhale the sand unit and go up and down, reduced the technical degree of difficulty, only need can solve at the flexible scheme of the screw thread that the dry flow air feed pipe tip set up and can bear high-pressure air.
Aiming at the problem that the sand suction unit is deformed due to impact in daily use, various solutions are provided pertinently, resistance can be reduced through the resistance reducing unit, and part of impact force can be offset through the buoyancy unit.
Drawings
Fig. 1 is a front view schematically showing a partial use state of the present invention.
Fig. 2 is a schematic front view of the components of the sand suction unit of the present invention.
Fig. 3 is a partial front view schematic diagram of the working principle of the water unit and the sand suction unit of the invention.
FIG. 4 is a side view of FIG. 3 of the present invention.
Fig. 5 is a side view schematically illustrating a use state of the lifting unit of fig. 4 according to the present invention.
Fig. 6 is a top view of fig. 3 in accordance with the present invention.
Figure 7 is a schematic front cross-sectional view of a water unit of the present invention.
Fig. 8 is a perspective view showing an exploded state of the attachment connecting plate, the buoyancy unit and the resistance reducing unit of the invention.
Detailed Description
The first embodiment.
The embodiment provides a scheme for cleaning settled sand in a sedimentation tank by utilizing the principle of aeration, and the horizontal flow aeration tank is provided with an aeration pipe, and the principle of the aeration pipe is that underwater silt is blown up and dispersed by high-pressure air, so that a sand suction pump can better suck the silt out of the water bottom; this embodiment directly utilizes the aeration principle to mention and discharge silt, and the concrete principle is: high-pressure air gets into tributary air-supply pipe 4 from mainstream air supply pipe 2, tributary air-supply pipe 4 carries high-pressure air to tributary sand discharging pipe 3 in, because the resistance of the intraductal below motion of high-pressure air in tributary sand discharging pipe 3 is greater than towards its top movement resistance, consequently high-pressure air begins to move towards tributary sand discharging pipe 3 top (along tributary sand discharging pipe 3 towards 1 direction of mainstream sand collecting pipe) along tributary sand discharging pipe 3 from the entering position of tributary sand discharging pipe 3, atmospheric pressure at tributary sand discharging pipe 3's high-pressure air entering position below reduces and produces the vacuum simultaneously, make 3 tip of tributary sand discharging pipe suck silt, silt is in 3 upward movements of tributary sand discharging pipe 1 along tributary sand discharging pipe, carry the assigned position along mainstream sand collecting pipe 1. It should be noted that the branch air pipe 4 should be connected to the branch sand pipe 3 at a suitable position, so that the pressure above the suitable position is lower than the pressure below the suitable position, and the high-pressure air can move to the relatively lower pressure above the suitable position.
The end part of the main flow air supply pipe 2 can be connected with an air blower or other high-pressure air sources, the high-pressure air is continuously conveyed to the branch air supply pipe 4 through the main flow air supply pipe 2, and because a sewage treatment plant originally needs a large amount of high-pressure air, only a part of the high-pressure controller main flow air supply pipe 2 needs to be shunted, and the air supply of the high-pressure air in other sewage treatment links is not influenced.
The advection aeration tank accessible is separated a plurality of processing ponds by separating the wall, and the unit on water can set up at this wall top, and a plurality of tributary sand discharge pipes 3 all can be connected to the length direction's of dry flow sand collection pipe 1 the left and right sides, carry the sand clearance for two processing ponds simultaneously, and dry flow air supply pipe 2 and tributary gas-supply pipe 4 are same as above. The bottom of the pool is provided with a sand collecting groove 6, so that sediment is deposited in the sand collecting groove 6, the sand collecting groove is convenient to clean, and the bottom of the tributary sand discharging pipe 3 and the bottom of the sand collecting groove 6 are kept at a certain distance on the basis.
The pipe outer sleeve 5 is sleeved with the branch sand discharging pipe 3 and the branch gas conveying pipe 4, and the branch sand discharging pipe 3 needs sand lifting operation, so that the branch sand discharging pipe 3 preferably extends out of a part of the bottom of the pipe outer sleeve 5, the sand lifting effect is improved, and partial sand is prevented from being brought into a gap between the pipe outer sleeve 5 and the branch sand discharging pipe 3. Because a part of the branch sand discharge pipe 3 extends out of the pipe outer sleeve 5, the branch sand discharge pipe is easily influenced by water flow impact force to deform, so that the branch sand discharge pipe 3 inclines and cannot be positioned at the central position of the sand collection groove 6, and the sand lifting effect is reduced; in order to better reduce the deformation of the tributary sand discharge pipe, a plurality of supporting pieces 7 are arranged in the pipe outer sleeve 5, the supporting pieces 7 are fixed in the pipe outer sleeve 5 and are used for contacting (only contacting) the pipe wall of the tributary sand discharge pipe 3 and supporting the tributary sand discharge pipe against the impact force of water flow, the supporting pieces 7 can be arranged around the pipe wall of the tributary sand discharge pipe 3 in a plurality of groups in the horizontal direction, a plurality of groups of supporting pieces 7 can be arranged along the length direction of the pipe outer sleeve 5 in the vertical direction, the shapes and the structures of the supporting pieces 7 are not limited, the pipe wall of the tributary sand discharge pipe can be contacted and supported, soft materials represented by rubber can be selected in materials, and the impact force can be absorbed.
In order to prevent the tributary sand drain pipe 3, the tributary gas pipe 4 and the pipe outer sleeve 5 from sinking to the water bottom or swinging uncontrollably under water flow impact, the tributary sand drain pipe 3, the tributary gas pipe 4 and the pipe outer sleeve 5 are necessarily fixed at proper positions by using connecting pieces, the specific proper positions are not limited, but the principle that the functions of the tributary sand drain pipe 3, the tributary gas pipe 4 and the pipe outer sleeve 5 are realized are firstly followed, and any position can be a proper position under the condition of meeting the first principle.
In the present embodiment, there is a preferable example, in order to better manage and protect each component of the above-water unit, the above-water unit is disposed in the safety sleeve 8, and the safety sleeve 8 can be provided with only necessary through holes (not shown) for the water supply unit and the sand suction unit to pass through.
In the present embodiment, there is a preferable example, because the amount of silt in the sewage is different in different seasons, and therefore the degree of silt accumulation (which may refer to the accumulated thickness in some cases) in the sand collecting tank 6 is different, so that the optimal value of the distance between the tributary sand discharging pipe 3 and the bottom of the sand collecting tank 6 is not a fixed value, but changes with the change of seasons, and therefore, in order to improve the sand extraction effect, the connecting part of the sand suction unit is defined as the bracket 10, and the bracket 10 is connected to the safety sleeve 8; the lifting unit 9 can be half buried in the wall surface, and the safety sleeve 8 can be directly driven to lift up and down to simultaneously drive the water unit and the sand sucking unit to lift.
There is also a preferable example in the present embodiment, which shows that the branch sand discharging pipe 3 is easily deformed by water flow impact, and the corresponding outside pipe sleeve 5 is also affected by the water flow impact, and the purpose of the outside pipe sleeve 5 is to reduce the impact force applied to the branch sand discharging pipe 3. In order to reduce the impact force on the outer sleeve 5, a resistance reducing unit 11 is mounted on the side wall of the outer sleeve 5 which is most directly impacted by water flow or the side wall facing the sewage in the incoming direction, the resistance of the outer sleeve 5 is reduced by the resistance reducing unit 11 through a conventional low-resistance structure, the low-resistance structure is composed of baffles 12, the baffles 12 are formed into outwards-protruding shapes which reduce the resistance of the water flow, the shapes are not limited, and any existing scheme capable of reducing the resistance of the water flow can be adopted, such as a bionic structure or a drop-shaped structure. But more preferably is shaped like a roof slope or sharp to "split" the flow to achieve a low resistance effect, since this shape entails a gap between the baffle 12 and the pipe outer sleeve 5, which is open above and below to allow sewage to be poured in.
There is also a preference for a particular structure of the connector, i.e. a reinforcement assembly, for securing the outer sleeve 5 of the pipe. Frame construction 13 and the 5 lateral walls of outside of tubes sleeve are connected, and frame construction 13 passes through connecting rod 14 and connects the wall, and frame construction 13 can keep structural strength to a certain extent under the condition of weight reduction, is convenient for install the maintenance passageway on frame construction 13 simultaneously, and the staff of being convenient for is close to outside of tubes sleeve 5 and carries out daily tour and troubleshooting.
In this embodiment, there is a preferable example, in order to facilitate the arrangement of the resistance reducing unit 11 and the reinforcing component on the outer sleeve 5, the pipe wall of the outer sleeve 5 may be provided with an accessory connecting plate 15, and the connecting plate 15 is in a plate shape, and may be integrally formed with the outer sleeve 5 during manufacturing, and has a plurality of threaded holes formed thereon for facilitating installation and connection.
Example two.
The present embodiment is made on the basis of the first embodiment. The scheme of the buoyancy unit is provided, the buoyancy unit water-permeable cage 16 is arranged on the accessory connecting plate 15 and is positioned in the interval between the accessory connecting plate 15 (originally the pipe outer sleeve 5) and the baffle plate 12, a floating body (not shown) is arranged in the water-permeable cage 16, and the floating body can be in any shape as long as the floating body has buoyancy and can be arranged in the water-permeable cage. Because the buoyancy unit is located outside of tubes sleeve 5 and faces the lateral wall of rivers impact force direction, make this lateral wall have an inclined power towards rivers impact direction under the buoyancy effect, can be less than the rivers impact force to a certain extent, better reply the problem of deformation.
In the above embodiment, if the upper and lower sides of the baffle 12 are closed structures, the space between the baffle 12 and the pipe outer sleeve 5 (or the accessory connecting plate 15) is changed into a water-blocking cavity, which can also provide buoyancy, but the water-blocking cavity may be difficult to bear the impact force of water flow during long-term use, which may cause the baffle 12 and the pipe outer sleeve 5 (or the accessory connecting plate 15) to shift, which may cause water leakage and destroy buoyancy, and therefore, a closed structure is not preferable.
Claims (5)
1. The horizontal flow aeration tank sand extracting device is characterized by comprising an above-water unit and a sand sucking unit, wherein the above-water unit comprises a main flow sand collecting pipe and a main flow air supply pipe, the sand sucking unit comprises a branch flow sand discharging pipe, a branch flow air conveying pipe and an outer pipe sleeve, a plurality of sand sucking units are connected to one above-water unit and support the above-water unit, the main flow sand collecting pipe and the main flow air supply pipe are respectively transversely arranged on the wall surface of the top of the aeration tank, the top end of the branch flow sand discharging pipe is communicated with the main flow sand collecting pipe, the bottom end of the branch flow sand discharging pipe is inserted into the bottom of the tank and is in spacing fit with a sand collecting groove at the bottom of the tank, the top end of the branch flow air conveying pipe is communicated with the side surface of the main flow air supply pipe, the bottom end of the branch flow sand discharging pipe is inserted into the sewage below the water surface, the part of the branch flow air conveying pipe is communicated with the side wall of the branch flow sand discharging pipe, the outer pipe sleeve sleeves the branch flow sand discharging pipe and the branch flow sand discharging pipe are sleeved in the branch flow sand discharging pipe and extend to the end part close to the bottom end of the branch flow sand discharging pipe, and the outer pipe sleeve is fixedly connected with a plurality of the inner wall of the outer pipe, the supporting piece is in contact with the wall of the branch sand discharge pipe and reduces the deformation degree of the branch sand discharge pipe caused by water flow impact, all components of the sand suction unit are fixed at proper positions through connecting pieces respectively so as to avoid uncontrolled free movement, and the supporting piece is made of rubber;
the device also comprises a resistance reducing unit, wherein the resistance reducing unit comprises a baffle plate which is arranged on the side wall of the outer pipe sleeve facing the incoming direction of the sewage, and the baffle plate is in an outward convex shape capable of reducing the resistance of water flow and is used for reducing the impact force of the sewage water flow on the outer pipe sleeve;
the connecting piece for fixing the outer sleeve of the pipe is a reinforcing component, the reinforcing component comprises a frame structure and a connecting rod, the frame structure is arranged on the side wall of the outer sleeve of the pipe, and two ends of the connecting rod are respectively connected with the frame structure and the wall surface of the aeration tank;
the side wall of the outer sleeve is provided with an accessory connecting plate along the length direction of the outer sleeve, and the resistance reducing unit and the reinforcing component are respectively installed on the accessory connecting plate through threaded connection;
the buoyancy unit is arranged on the accessory connecting plate and positioned in the interval between the accessory connecting plate and the baffle plate to provide buoyancy for the outer sleeve of the pipe.
2. The sand extraction device of the advection aeration tank of claim 1, wherein the water unit is sleeved with a safety sleeve, and the side wall of the safety sleeve is respectively provided with a through hole for the water unit and the sand suction unit to pass through.
3. The sand extraction device of the advection aeration tank of claim 2, further comprising a lifting unit, wherein the connecting piece for fixing the sand suction unit is a bracket, the sand suction unit is fixed on the side wall of the safety sleeve through the bracket, and the lifting unit is fixed on the wall surface at the top of the aeration tank and can drive the safety sleeve to perform lifting movement.
4. The sand extraction device of the advection aeration tank of claim 3, wherein the lifting unit adopts a hydraulic lifting mechanism to control the lifting of the safety sleeve.
5. The sand extraction device of the advection aeration tank of claim 1, wherein the outward convex shape is a sharp shape similar to a roof slope, so that a space is formed between the baffle and the attachment connecting plate, and the bottom of the space is opened up and down.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011528008.7A CN112569647A (en) | 2020-12-22 | 2020-12-22 | Pneumatic sand extracting system of horizontal-flow type aeration grit chamber |
| CN2020115280087 | 2020-12-22 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112973205A CN112973205A (en) | 2021-06-18 |
| CN112973205B true CN112973205B (en) | 2022-08-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011528008.7A Pending CN112569647A (en) | 2020-12-22 | 2020-12-22 | Pneumatic sand extracting system of horizontal-flow type aeration grit chamber |
| CN202110464204.0A Active CN112973205B (en) | 2020-12-22 | 2021-04-28 | Pneumatic sand extracting system of horizontal-flow type aeration grit chamber |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011528008.7A Pending CN112569647A (en) | 2020-12-22 | 2020-12-22 | Pneumatic sand extracting system of horizontal-flow type aeration grit chamber |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN208733583U (en) * | 2018-08-04 | 2019-04-12 | 孙明 | A kind of hydraulic engineering water conservancy gate |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2052793B (en) * | 1979-03-17 | 1983-06-02 | Dew H | Settlement tank sludge removel |
| CN202179877U (en) * | 2011-06-29 | 2012-04-04 | 中国水电顾问集团华东勘测设计研究院 | Active sand settling basin |
| CN102921201A (en) * | 2012-10-26 | 2013-02-13 | 江苏通用环保集团有限公司 | Air sand extraction device for horizontal flow aeration grit chamber sand sucker |
| CN202933520U (en) * | 2012-10-26 | 2013-05-15 | 江苏通用环保集团有限公司 | Air sand-lifting device for sand sucker for horizontal-flow aerated grit chamber |
| CN104645676A (en) * | 2013-11-25 | 2015-05-27 | 李鹏 | Sand setting tank |
| CN105502548A (en) * | 2015-12-07 | 2016-04-20 | 宋德安 | Aerated grit chamber with fixed tail end for grit discharge |
| CN206168003U (en) * | 2016-11-12 | 2017-05-17 | 深圳市林外林园林工程有限公司 | Grit chamber |
| CN107376438A (en) * | 2017-08-14 | 2017-11-24 | 浙江天行健水务有限公司 | Rail mounted suction dredge |
| CN207584248U (en) * | 2017-12-06 | 2018-07-06 | 浙江固的管业有限公司 | A kind of three-way pipe |
| CN108374396A (en) * | 2018-05-10 | 2018-08-07 | 钟红灵 | A kind of hydraulic engineering lift water conservancy gate |
-
2020
- 2020-12-22 CN CN202011528008.7A patent/CN112569647A/en active Pending
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2021
- 2021-04-28 CN CN202110464204.0A patent/CN112973205B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN208733583U (en) * | 2018-08-04 | 2019-04-12 | 孙明 | A kind of hydraulic engineering water conservancy gate |
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| CN112973205A (en) | 2021-06-18 |
| CN112569647A (en) | 2021-03-30 |
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Effective date of registration: 20230414 Address after: 266000 No. 55 Taiping Road, Shinan District, Qingdao, Shandong Patentee after: Qingdao Water Group Co.,Ltd. Patentee after: Qingdao Shuangyuan water Co.,Ltd. Address before: 266000 west section of Zhengyang Road, Chengyang street, Chengyang District, Qingdao City, Shandong Province (West of Jingkou Village) Patentee before: Qingdao Shuangyuan water Co.,Ltd. |