CN220223815U - Backflow structure and ship domestic sewage treatment device - Google Patents
Backflow structure and ship domestic sewage treatment device Download PDFInfo
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- CN220223815U CN220223815U CN202321730641.3U CN202321730641U CN220223815U CN 220223815 U CN220223815 U CN 220223815U CN 202321730641 U CN202321730641 U CN 202321730641U CN 220223815 U CN220223815 U CN 220223815U
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- connecting pipe
- aeration
- communicated
- aeration chamber
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- 239000010865 sewage Substances 0.000 title claims abstract description 40
- 238000005273 aeration Methods 0.000 claims abstract description 83
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 44
- 238000010992 reflux Methods 0.000 claims abstract description 29
- 239000007788 liquid Substances 0.000 claims abstract description 4
- 230000000740 bleeding effect Effects 0.000 claims description 31
- 239000012528 membrane Substances 0.000 claims description 18
- 238000001914 filtration Methods 0.000 claims description 15
- 238000005070 sampling Methods 0.000 claims description 5
- 230000002485 urinary effect Effects 0.000 claims description 4
- 238000009423 ventilation Methods 0.000 claims description 4
- 230000003248 secreting effect Effects 0.000 claims 2
- 238000005265 energy consumption Methods 0.000 abstract description 7
- 230000008901 benefit Effects 0.000 abstract description 4
- 238000013461 design Methods 0.000 abstract description 3
- 238000012423 maintenance Methods 0.000 abstract description 2
- 238000005352 clarification Methods 0.000 description 5
- 238000004062 sedimentation Methods 0.000 description 5
- 238000001471 micro-filtration Methods 0.000 description 4
- 239000010802 sludge Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000000108 ultra-filtration Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000013505 freshwater Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 238000010298 pulverizing process Methods 0.000 description 2
- 210000003437 trachea Anatomy 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005842 biochemical reaction Methods 0.000 description 1
- 239000010866 blackwater Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- Physical Water Treatments (AREA)
Abstract
The application discloses a reflux structure and a ship domestic sewage treatment device, wherein the reflux structure comprises a first connecting pipe and a second connecting pipe, a water inlet of the first connecting pipe is positioned at the lower part of a reflux chamber A, and a water outlet of the first connecting pipe is positioned at the upper part of a reflux chamber B; the lower part of the first connecting pipe is communicated with a second connecting pipe, the second connecting pipe is connected with a fan, the fan conveys gas to the second connecting pipe, and liquid in the backflow chamber A flows into the backflow chamber B. The reflux structure has ingenious structural design, can be applied to a ship domestic sewage treatment device, can utilize an aeration fan to ensure that a connecting pipeline of a water discharge chamber and the aeration chamber generates pressure difference, realizes sewage reflux, can save the use of a pump to realize sewage reflux, reduces energy consumption, reduces the use and maintenance of the pump, thereby reducing energy consumption, saving cost and improving economic benefit.
Description
Technical Field
The utility model belongs to the field of ship domestic sewage treatment, and particularly relates to a backflow structure and a ship domestic sewage treatment device.
Background
The luxury cruise ship, the large offshore platform and the large ocean cargo ship have more people and longer sailing time, a large amount of fresh water is required to be consumed daily to meet daily needs, and a large amount of domestic sewage generated daily is also required to be treated and discharged, so that the generated domestic sewage is treated and recycled, the fresh water consumption can be reduced, and the economic benefit of ship operation is improved. The CN202272804U ship domestic sewage treatment device comprises a body and an air pump, wherein a biological selection area, an aerobic biochemical area, a sedimentation clarification area, a middle water chamber and a clear water chamber are arranged in the inner cavity of the body; the biological selection area is communicated with the aerobic area through a through hole of which the upper part is provided with a filter screen, the aerobic biochemical area is communicated with the middle lower part of the sedimentation and clarification area, and the sedimentation and clarification area is communicated with the middle water chamber at the top part of the sedimentation and clarification area; the bottom of the sedimentation and clarification area is communicated with the biological selection area through a sludge return pipe, and one air pipe of the air pump is communicated with the sludge return pipe through a tee joint; the middle water chamber is communicated with a microfiltration membrane assembly water inlet collecting pipe consisting of a plurality of microfiltration membrane column elements through a circulating cross flow pump, microfiltration concentrated solution flows back to the biochemical selection area through a microfiltration concentrated solution cross flow port, permeate is communicated with the ultrafiltration membrane assembly water inlet collecting pipe, ultrafiltration concentrated solution of the ultrafiltration membrane assembly flows back to the biochemical selection area through a filtration concentrated solution cross flow port, and permeate enters the clean water chamber. The utility model provides a domestic sewage treatment device in boats and ships domestic sewage treatment system, is including the aeration cabinet, deposit cabinet and the water collecting tank that set gradually, be equipped with the trachea in the aeration cabinet, the trachea is connected with the air pump through the valve, is connected a mud back flow at valve and air pump, and mud back flow connection is in the upside of aeration cabinet, sets up a valve on the mud back flow. In the sewage treatment process, the backflow is an indispensable link, and the existing backflow process is completed by completely depending on pump work, so that the energy consumption is high.
Disclosure of Invention
The utility model aims to provide a ship domestic sewage treatment device, which reduces the use of a pump, reduces the energy consumption in the sewage treatment process and reduces the sewage treatment cost by arranging a reflux structure in a reflux link.
In order to achieve the above purpose, the technical scheme adopted in the application is as follows:
the backflow structure comprises a first connecting pipe and a second connecting pipe, a water inlet of the first connecting pipe is positioned at the lower part of the backflow chamber A, and a water outlet of the first connecting pipe is positioned at the upper part of the backflow chamber B; the lower part of the first connecting pipe is communicated with a second connecting pipe, the second connecting pipe is connected with a fan, the fan conveys gas to the second connecting pipe, and liquid in the backflow chamber A flows into the backflow chamber B.
More preferably, the first connecting pipe comprises an L-shaped thick section, a vertical thin section and an L-shaped thin section, two ends of the vertical thin section are respectively connected with the vertical section of the L-shaped thick section and the horizontal section of the L-shaped thin section, the horizontal section of the L-shaped thick section is provided with a water inlet, the vertical section of the L-shaped thin section is provided with a water outlet, the second connecting pipe is an L-shaped pipe, the pipe diameter of the second connecting pipe is smaller than that of the L-shaped thick section, and the horizontal section of the second connecting pipe is communicated with the vertical section of the L-shaped thick section of the first connecting pipe.
More preferably, the L-shaped thin section of the first connecting tube is provided with a transparent viewing tube.
The ship domestic sewage treatment device with the reflux structure comprises an aeration chamber corresponding to the reflux chamber B and a bleeding chamber corresponding to the reflux chamber A, wherein a fan is respectively connected with an aeration head of the aeration chamber, an aeration head in the bleeding chamber and a second connecting pipe of the reflux structure, the aeration chamber and the bleeding chamber are communicated through the reflux structure, a filtering membrane group is arranged in the bleeding chamber, and the filtering membrane group is communicated with an ultraviolet sterilizer.
More preferably, the aeration chamber comprises a first aeration chamber and a second aeration chamber, the lower parts of the first aeration chamber and the second aeration chamber are communicated, the upper parts of the second aeration chamber and the urinary chamber are communicated, the first aeration chamber is communicated with the overflow port, and the second aeration chamber is communicated with the ventilation port.
More preferably, the filtering membrane group of the bleeding chamber is connected with the ultraviolet sterilizer through the plunger pump, the outlet side of the ultraviolet sterilizer is connected with the public end of the three-way valve, the first outlet end of the three-way valve is connected with the discharge port through a pipeline, the second outlet end of the three-way valve is connected with the MBR module through a pipeline, the MBR module is connected with the discharge port, and the upper part of the bleeding chamber is connected with the MBR module through a valve.
More preferably, a sampling cock is arranged on a pipeline connected with the discharge port.
More preferably, the first aeration chamber, the second aeration chamber and the bleeding chamber are respectively connected with the inlet side of the crushing pump through a discharge pipe, a valve is arranged on the discharge pipe, the outlet side of the crushing pump is connected with the public end of a three-way valve, the first outlet end of the three-way valve is connected with the second aeration chamber through a pipeline, and the second outlet end of the three-way valve is connected with a shore or chord outlet through a pipeline.
More preferably, the first aeration chamber, the second aeration chamber and the bleeding chamber are also connected with a clean water port through pipelines.
The beneficial effects of the utility model are as follows: (1) The reflux structure has ingenious structural design, and can utilize the aeration fan to enable the connecting pipeline of the water-discharging chamber and the aeration chamber to generate pressure difference, thereby realizing sewage reflux, saving the use of the pump, realizing sewage reflux, reducing energy consumption, reducing the use and maintenance of the pump, reducing energy consumption, saving cost and improving economic benefit. (2) The MBR module is used as a spare of the filtering membrane group in the water draining chamber, and when the filtering membrane group in the water draining chamber is abnormal in function, the MBR module can be used for replacing, so that the use safety of the sewage treatment device is improved. (3) The sewage treatment device has reasonable structural design, high treatment efficiency, smaller volume and stronger adaptability, and does not need a storage bin.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a schematic diagram of a reflow configuration.
Fig. 2 is a state diagram of the use of the reflow structure.
Fig. 3 is a schematic view of a ship domestic sewage treatment apparatus.
In the figure: 1 reflux structure, 11 first connecting pipe, 111L type thick section, 112 vertical thin section, 113L type thin section, 114 transparent observation pipe, 115 water inlet, 116 water outlet, 12 second connecting pipe, 121 vertical section, 122 horizontal section, 2 reflux chamber B,21 first aeration chamber, 22 second aeration chamber, 3 reflux chamber A,4 fan, 5 water-discharging chamber, 6 plunger pump, 7 crushing pump, 801-812 valve, 901, 902 three-way valve, 903 ultraviolet sterilizer, 904MBR module, 905 aeration head, 906 overflow port, 907 clear water port, 908 port or port, 909 sampling cock, 910, 911 port, 10 filtering membrane group.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
In the description of the present application, it should also be noted that, unless explicitly stated and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.
The utility model provides a backflow structure which can be applied to a ship domestic sewage treatment device, and the backflow structure is shown in fig. 1 and 2, and comprises a first connecting pipe 11 and a second connecting pipe 12, wherein a water inlet 115 of the first connecting pipe 11 is positioned at the lower part of a backflow chamber A3, and a water outlet 116 of the first connecting pipe 11 is positioned at the upper part of a backflow chamber B2; the lower part of the first connecting pipe 11 is communicated with the second connecting pipe 12, the second connecting pipe 12 is connected with the fan 4, the fan 4 conveys gas to the second connecting pipe 12, and liquid in the backflow chamber A3 flows into the backflow chamber B2. The first connecting pipe 11 comprises an L-shaped thick section 111, a vertical thin section 112 and an L-shaped thin section 113, two ends of the vertical thin section 112 are respectively connected with the vertical section of the L-shaped thick section 111 and the horizontal section of the L-shaped thin section 113, the horizontal section of the L-shaped thick section 111 is provided with a water inlet 115, the vertical section of the L-shaped thin section 113 is provided with a water outlet 116, the second connecting pipe 12 is an L-shaped pipe, the pipe diameter of the second connecting pipe 12 is smaller than that of the L-shaped thick section 111, and the horizontal section 122 of the second connecting pipe 12 is communicated with the vertical section of the L-shaped thick section 111 of the first connecting pipe 11 so as to ensure the optimal ventilation effect. In this embodiment, the pipe diameter of the L-shaped thick section 111 is larger than that of the vertical thin section 112, so that the water inlet 115 can be guaranteed to have enough water during backflow, and if the pipe diameters are the same, stable backflow cannot be guaranteed because the vertical height is higher. The L-shaped thin section 113 of the first connecting pipe 11 is provided with a transparent observation pipe 114, so that the sewage backflow condition can be conveniently observed.
The utility model also provides a ship domestic sewage treatment device applying the reflux structure 1, as shown in fig. 3, the ship domestic sewage treatment device comprises an aeration chamber corresponding to a reflux chamber B2 and a bleeding chamber 5 corresponding to a reflux chamber A3, a fan 4 is respectively connected with an aeration head 905 of the aeration chamber, the aeration head 905 in the bleeding chamber 5 and a second connecting pipe 12 of the reflux structure 1, the aeration chamber and the bleeding chamber 5 are communicated through the reflux structure 1, a filtering membrane group 10 is arranged in the bleeding chamber 5, and the filtering membrane group 10 is communicated with an ultraviolet sterilizer 903. The aeration chamber comprises a first aeration chamber 21 and a second aeration chamber 22, the lower parts of the first aeration chamber 21 and the second aeration chamber 22 are communicated through a communicating port 910, the upper parts of the second aeration chamber 22 and the bleeding chamber 5 are communicated through a communicating port 911, the first aeration chamber 21 is communicated with an overflow port 906, and the second aeration chamber 22 is communicated with a ventilation port 912. The pipeline that aeration head 905 in first aeration chamber 21 and second aeration chamber 22 and fan 4 are connected is provided with valve 801, is provided with valve 802 on the pipeline that the urinary chamber 5 is connected with fan 4, is equipped with valve 803 on the pipeline that reflux structure 1 and fan 4 are connected, flows into aeration chamber, urinary chamber 5 and reflux structure 1 through valve 801, 802, 803 control gas. The backflow structure 1 shares a fan 4 with the aeration chamber and the water-discharging chamber 5, no additional fan 4 is needed, the using quantity of the fans 4 is reduced, and the equipment cost is reduced. The same fan 4 can complete aeration and backflow simultaneously, so that the energy consumption is greatly reduced, and the cost of energy use is reduced. In this embodiment, the explosion chamber is separated into two chambers through the baffle, and activated sludge distributes evenly, and sewage reaction is more abundant, and sewage can advance the reaction simultaneously, has further shortened the time, adopts two aeration chambers to need not to store the storehouse structure, and compares the sewage treatment device that has the storehouse of storing, and is very low to the requirement of water level.
The filtering membrane group 10 of the water bleeding chamber 5 is connected with the ultraviolet sterilizer 903 through the plunger pump 6, the outlet side of the ultraviolet sterilizer 903 is connected with the public end of the three-way valve 901, the first outlet end of the three-way valve 901 is connected with the discharge port 913 through a pipeline, the second outlet end of the three-way valve 901 is connected with the MBR module 904 through a pipeline, the MBR module 904 is connected with the discharge port 913, and the upper part of the water bleeding chamber 5 is connected with the MBR module 904 through a valve 806. The black water inlet and the medical room opening are connected with the aeration chamber through pipelines, a valve 811 and a valve 812 are respectively arranged on the two pipelines, sewage enters the aeration chamber, activated sludge is arranged in the aeration chamber to carry out biochemical reaction on the sewage, then water after the reaction is completed overflows from the conducting opening 911 to the bleeding chamber 5, is filtered by the filtering membrane group 10, the plunger pump 6 works, the valves 804 and 805 on the connecting pipelines at the two ends of the plunger pump 6 are opened, the water flows through the ultraviolet sterilizer 903, and the water is discharged after the sterilization is completed. Aeration to the aeration chamber and the bleeding chamber 5 is realized by a fan 4 through control valves 801 and 802, so that the sewage in the cabin is more fully reacted and does not precipitate. When the function of the filtering membrane set 10 in the bleeding chamber 5 is abnormal, the MBR module 904 can be used to replace the filtering membrane set 10 in the bleeding chamber 5, the three-way valves 901 and 902 are reversing valves, when the plunger pump 6 is started, the valves 804 and 805 are opened, the reversing valve 901 is communicated with the outlet of the ultraviolet sterilizer 903 and the MBR module 904, and is discharged through the discharge port 911, at this time, because the MBR module 904 works, the valve 806 is opened, and impurities filtered by the MBR module 904 and the like flow back to the bleeding chamber 5.
More preferably, a sampling cock 909 is provided on a pipe connected to the discharge port 913, and the treated water is conveniently sampled by the sampling cock.
In this embodiment, the first aeration chamber 21, the second aeration chamber 22 and the bleeding chamber 5 are respectively connected with the inlet side of the pulverizing pump 7 through a discharge pipe, a valve is arranged on the discharge pipe, a valve 807, a valve 808 and a valve 809 are respectively arranged on the discharge pipe of the first aeration chamber 21, the second aeration chamber 22 and the bleeding chamber 5, the discharge is controlled by the valve, the outlet side of the pulverizing pump 7 is connected with the common end of the three-way valve 902, the first outlet end of the three-way valve 9902 is connected with the second aeration chamber 22 through a pipeline, the second outlet end is connected with the bank through a pipeline or the chord through an outlet 908, and a valve 810 is arranged on the connecting pipeline of the three-way valve 902 and the second aeration chamber 22. The first aeration chamber 21, the second aeration chamber 22 and the bleeding chamber 5 are also connected with a clean water port 907 through pipelines. When impurities and the like accumulate in the first aeration chamber 21, the second aeration chamber 22 and the bleeding chamber 5 after long-term use of the sewage treatment apparatus and the like are required to be discharged, the valve 807, the valve 808 and the valve 809 are opened, the impurities and the like are crushed by the crushing pump 7 and then discharged, and clean water is injected into the first aeration chamber 21, the second aeration chamber 22 and the bleeding chamber 5 through the clean water port 907 for cleaning.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims (9)
1. Reflux structure, its characterized in that: the device comprises a first connecting pipe and a second connecting pipe, wherein a water inlet of the first connecting pipe is positioned at the lower part of a reflow chamber A, and a water outlet of the first connecting pipe is positioned at the upper part of a reflow chamber B; the lower part of the first connecting pipe is communicated with a second connecting pipe, the second connecting pipe is connected with a fan, the fan conveys gas to the second connecting pipe, and liquid in the backflow chamber A flows into the backflow chamber B.
2. The reflow structure of claim 1, wherein: the first connecting pipe comprises an L-shaped thick section, a vertical thin section and an L-shaped thin section, two ends of the vertical thin section are respectively connected with the vertical section of the L-shaped thick section and the horizontal section of the L-shaped thin section, the horizontal section of the L-shaped thick section is provided with a water inlet, the vertical section of the L-shaped thin section is provided with a water outlet, the second connecting pipe is an L-shaped pipe, the pipe diameter of the second connecting pipe is smaller than that of the L-shaped thick section, and the horizontal section of the second connecting pipe is communicated with the vertical section of the L-shaped thick section of the first connecting pipe.
3. The reflow structure of claim 2, wherein: the L-shaped thin section of the first connecting pipe is provided with a transparent observation pipe.
4. A ship domestic sewage treatment apparatus using the reflux structure according to any one of claims 1 to 3, characterized in that: the device comprises an aeration chamber corresponding to a backflow chamber B and a bleeding chamber corresponding to a backflow chamber A, wherein a fan is respectively connected with an aeration head of the aeration chamber, an aeration head in the bleeding chamber and a second connecting pipe of a backflow structure, the aeration chamber and the bleeding chamber are communicated through the backflow structure, and a filtering membrane group is arranged in the bleeding chamber and is communicated with an ultraviolet sterilizer.
5. The ship domestic sewage treatment apparatus according to claim 4, wherein: the aeration chamber comprises a first aeration chamber and a second aeration chamber, the lower parts of the first aeration chamber and the second aeration chamber are communicated, the upper parts of the second aeration chamber and the urinary chamber are communicated, the first aeration chamber is communicated with the overflow port, and the second aeration chamber is communicated with the ventilation port.
6. The ship domestic sewage treatment apparatus according to claim 4, wherein: the filtering membrane group of the water-secreting chamber is connected with an ultraviolet sterilizer through a plunger pump, the outlet side of the ultraviolet sterilizer is connected with the public end of a three-way valve, the first outlet end of the three-way valve is connected with a discharge port through a pipeline, the second outlet end of the three-way valve is connected with an MBR module through a pipeline, the MBR module is connected with the discharge port, and the upper part of the water-secreting chamber is connected with the MBR module through a valve.
7. The ship domestic sewage treatment apparatus according to claim 6, wherein: a sampling cock is arranged on a pipeline connected with the discharge port.
8. The ship domestic sewage treatment apparatus according to claim 5, wherein: the first aeration chamber, the second aeration chamber and the bleeding chamber are respectively connected with the inlet side of the crushing pump through a discharge pipe, a valve is arranged on the discharge pipe, the outlet side of the crushing pump is connected with the public end of a three-way valve, the first outlet end of the three-way valve is connected with the second aeration chamber through a pipeline, and the second outlet end of the three-way valve is connected with a port or a chord outlet through a pipeline.
9. The ship domestic sewage treatment apparatus according to claim 5, wherein: the first aeration chamber, the second aeration chamber and the bleeding chamber are also connected with a clean water port through pipelines.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321730641.3U CN220223815U (en) | 2023-07-04 | 2023-07-04 | Backflow structure and ship domestic sewage treatment device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321730641.3U CN220223815U (en) | 2023-07-04 | 2023-07-04 | Backflow structure and ship domestic sewage treatment device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220223815U true CN220223815U (en) | 2023-12-22 |
Family
ID=89175268
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321730641.3U Active CN220223815U (en) | 2023-07-04 | 2023-07-04 | Backflow structure and ship domestic sewage treatment device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220223815U (en) |
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2023
- 2023-07-04 CN CN202321730641.3U patent/CN220223815U/en active Active
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