CN112962734B - Water seal diversion pipe - Google Patents
Water seal diversion pipe Download PDFInfo
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- CN112962734B CN112962734B CN202110224293.1A CN202110224293A CN112962734B CN 112962734 B CN112962734 B CN 112962734B CN 202110224293 A CN202110224293 A CN 202110224293A CN 112962734 B CN112962734 B CN 112962734B
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- pipe
- water seal
- water
- fixed
- thick bamboo
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03C—DOMESTIC PLUMBING INSTALLATIONS FOR FRESH WATER OR WASTE WATER; SINKS
- E03C1/00—Domestic plumbing installations for fresh water or waste water; Sinks
- E03C1/12—Plumbing installations for waste water; Basins or fountains connected thereto; Sinks
- E03C1/28—Odour seals
- E03C1/29—Odour seals having housing containing dividing wall, e.g. tubular
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03C—DOMESTIC PLUMBING INSTALLATIONS FOR FRESH WATER OR WASTE WATER; SINKS
- E03C1/00—Domestic plumbing installations for fresh water or waste water; Sinks
- E03C1/12—Plumbing installations for waste water; Basins or fountains connected thereto; Sinks
- E03C1/28—Odour seals
- E03C1/298—Odour seals consisting only of non-return valve
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Sink And Installation For Waste Water (AREA)
Abstract
The utility model relates to a water seal leading pipe, it includes a water seal section of thick bamboo to and connect the inlet tube at water seal section of thick bamboo top and connect the outlet pipe at water seal section of thick bamboo lateral wall, be equipped with the water seal pipe in the water seal section of thick bamboo, water seal pipe top communicates with each other with the inlet tube, water seal socle end is located between water seal bobbin base portion and the outlet pipe, water seal pipe diameter is less than water seal section of thick bamboo diameter, the water seal pipe is including fixed pipe and activity pipe, fixed bobbin top is fixed in water seal section of thick bamboo top, the activity pipe box is at fixed tub of other end, fixed pipe is close to and is equipped with the outlet on the outlet pipe side, the activity pipe is kept away from fixed pipe one end and is equipped with the throat, be equipped with the floating block on the activity pipe, this application has the effect that promotes drainage efficiency.
Description
Technical Field
The application relates to the field of sanitary ware manufacturing, in particular to a water seal water conduit.
Background
Bathtubs, wash basins, etc. are sanitary products of the basic configuration of each bathroom, and drainage devices are provided on the sanitary products. The structure of the drainage device mainly comprises a drainer and a water conduit, wherein the drainer is directly arranged on a bathroom product, and the water conduit is used for connecting the drainer with a sewer pipe.
In order to improve the sealing effect on the odor of a sewer pipe, a water seal structure is adopted in the water conduit for sealing, if the authorized public number is CN212506563U, the water conduit is mainly provided with an odor-proof pipe, when wastewater flows into the water conduit body, the wastewater is directly introduced into the odor-proof pipe, flows to the lowest end of the water conduit body and then reversely flows from the inner wall of the water conduit body and the outer wall of the odor-proof pipe and is discharged through a drainage section, when drainage is completed, part of the wastewater is remained at the bottom of the water conduit body, and the liquid level is higher than the lowest end of the odor-proof pipe, so that the water-sealing and odor-proof functions are realized.
In view of the above-mentioned related technologies, the inventor believes that in the actual use process, especially the bathtub and the basin can temporarily store a large amount of water, when needing to drain, the whole drainage is large, and the gap between the outer wall of the deodorization pipe and the inner part of the water conduit body in the existing water conduit is small, which directly affects the drainage efficiency.
Disclosure of Invention
In order to promote drainage efficiency, this application provides a water seal leading pipe.
The application provides a water seal leading water pipe adopts following technical scheme:
the utility model provides a water seal leading water pipe, includes a water seal section of thick bamboo to and connect at the inlet tube at water seal section of thick bamboo top and connect the outlet pipe at water seal section of thick bamboo lateral wall, be equipped with the water seal pipe in the water seal section of thick bamboo, water seal pipe top communicates with each other with the inlet tube, water seal socle end is located between water seal bobbin base portion and the outlet pipe, water seal pipe diameter is less than water seal section of thick bamboo diameter, the water seal pipe is including fixed pipe and activity pipe, fixed pipe top is fixed in water seal section of thick bamboo top, the activity pipe box is at the fixed pipe other end, fixed pipe is close to and is equipped with the outlet on the outlet pipe side, the activity pipe is kept away from fixed pipe one end and is equipped with the throat, the activity is managed and is equipped with the floating block.
Through adopting above-mentioned technical scheme, when carrying out large-traffic drainage, the inlet tube lets in a large amount of waste water, waste water gets into in the fixed pipe up to the activity pipe, the in-process that flows fast at liquid can produce the impact to the throat, and the drainage efficiency of throat is little, lead to the activity pipe can receive great water impact influence, thereby overcome the buoyancy of activity pipe and floating block, and frictional force between activity pipe and the fixed pipe, thereby time activity pipe is along fixed pipe downstream, thereby make the outlet open, thereby a large amount of liquid can directly let in the outlet through the outlet, thereby the clearance that activity pipe outer wall and water seal pipe inner wall formed influences drainage efficiency has been reduced.
Optionally, be equipped with on the fixed outer wall of tube and supply the spacing step of conflict of activity pipe top, spacing step is located the outlet top.
Through adopting above-mentioned technical scheme, under normal water seal condition, the movable pipe is because buoyancy upwards floats the top and contradicts on spacing step to realized the effective of movable pipe and fixed pipe and sealed, also avoided the movable pipe excessively to float.
Optionally, the length from the limiting step to the bottom end of the fixed pipe is smaller than the distance from the top end of the movable pipe to the necking.
Through adopting above-mentioned technical scheme, avoid throat and fixed pipe inconsistent and produce great frictional force.
Optionally, a plurality of the floating blocks are circumferentially arranged on the movable tube.
Through adopting above-mentioned technical scheme, the kicking block provides comparatively even buoyancy for each position of movable tube, reduces the movable tube and produces crooked phenomenon.
Optionally, the floating block is fixed with the movable pipe outer wall, the floating block is contradicted with water seal section of thick bamboo inner wall.
Through adopting above-mentioned technical scheme, the in-process that removes at the movable tube is contradicted through kicking block and water seal section of thick bamboo inner wall and is promoted the stability when removing.
Optionally, the floating block is strip-shaped, and the length direction of the floating block is the same as that of the movable tube.
Through adopting above-mentioned technical scheme, the setting of kicking block is the same with the rivers direction, reduces the influence of kicking block to rivers.
Optionally, a floating cavity is arranged in the floating block.
Through adopting above-mentioned technical scheme, float the effectual buoyancy that promotes the floating block of cavity.
Optionally, the bottom of the water seal cylinder is provided with a replacement port, and the replacement port is connected with a sealing plate through threads.
Through adopting above-mentioned technical scheme, be convenient for change water seal pipe and clearance water seal section of thick bamboo inside through changing the mouth.
In summary, the present application includes at least one of the following beneficial technical effects:
1. when large-flow water is drained, the drainage port is opened to improve the drainage efficiency;
2. the movable pipe can reset after being moved away under the action of buoyancy, so that the effect of water seal deodorization is ensured.
Drawings
Fig. 1 is an overall view of the present embodiment.
Fig. 2 is an internal structural view of the present embodiment.
Fig. 3 is a view showing the drain opening of the present embodiment.
Fig. 4 is a structural view of the fixed pipe of the present embodiment.
Fig. 5 is a structural view of the movable tube of the present embodiment.
Description of the reference numerals: 1. a water seal cylinder; 11. replacing the port; 12. a closing plate; 2. a water inlet pipe; 21. a nut; 3. a water outlet pipe; 4. water sealing the pipe; 41. a fixed tube; 411. a water outlet; 412. a limiting step; 413. a convex strip; 42. a movable tube; 421. necking; 5. floating blocks; 51. a floating cavity.
Detailed Description
The present application is described in further detail below with reference to figures 1-5.
As shown in fig. 1 and 2, the sanitary ware such as a bathtub and a basin is used for daily washing and rinsing, the water conduit is used for connecting the sanitary ware with a building drainage pipeline, wherein the water conduit is provided with a water inlet pipe 2 and a water outlet pipe 3, the water inlet pipe 2 is connected with the drainage position of the sanitary ware, the water outlet pipe 3 is connected with the building drainage pipeline, and the water conduit is provided with a water seal deodorization structure for isolating the gas of the building drainage pipeline and discharging the gas to the indoor through the water conduit.
As shown in fig. 1 and 2, wherein the water-sealing deodorization structure includes a water-sealing pipe 4 disposed in a water-sealing cylinder 1, wherein the bottom of the water-sealing pipe 4 is lower than the height of the water outlet pipe 3 relative to the water-sealing cylinder 1, so that the liquid of the water inlet pipe 2 enters the water-sealing cylinder 1 through the water-sealing pipe 4, and then is discharged through the water outlet pipe 3, after the drainage work is completed, part of water remains in the water-sealing cylinder 1, and the liquid level is higher than the lowest end of the water-sealing pipe 4, thereby achieving the effect of liquid-sealing water conduit, avoiding the gas from flowing into the room, and achieving the effective deodorization effect.
The embodiment of the application discloses a water seal diversion pipe. Referring to fig. 1 and 2, the water-sealed toilet comprises a water-sealed cylinder 1, a water inlet pipe 2 connected to the top of the water-sealed cylinder 1 and a water outlet pipe 3 connected to the side wall of the water-sealed cylinder 1, wherein a water-sealed pipe 4 is arranged in the water-sealed cylinder 1, the top end of the water-sealed pipe 4 is communicated with the water inlet pipe 2, the bottom end of the water-sealed pipe 4 is arranged between the bottom of the water-sealed cylinder 1 and the water outlet pipe 3, the diameter of the water-sealed pipe 4 is smaller than that of the water-sealed cylinder 1, when the water-sealed toilet is installed and used, the water inlet pipe 2 is connected with a drainage position of a bathroom, such as a bathtub, a washbasin and the like, the water outlet pipe 3 is connected with a building pipeline, wherein the positions of the water inlet pipe 2 and the water-sealed cylinder 1 are kept in a vertical state as much as possible to improve the smoothness of the flow of liquid when the water-sealed cylinder 1, the water-sealed cylinder 4 comprises a fixed pipe 41 and a movable pipe 42, the whole can be made of plastic water-sealed, preferably made of soft plastic material, the outer wall of the top of the fixed pipe 41 is arranged in an expanded shape for supporting at the top of the water-sealed cylinder 1, wherein inlet tube 2 inserts and cup joints in fixed pipe 41, sets up sand grip 413 in fixed pipe 41, and sand grip 413 card has promoted fixed effect at inlet tube 2 outer wall, fixes through nut 21 at water seal section of thick bamboo 1 top again, and fixed pipe 41 is fixed to the downward extrusion simultaneously to make the fixed pipe 41 top compression of expansion dress, consequently fixed pipe 41 can not only effectual fixed, and provide the sealed effect to between water seal section of thick bamboo 1 top and the inlet tube 2.
As shown in fig. 2 and 3, the movable pipe 42 is sleeved at the other end of the fixed pipe 41, the movable pipe 42 is used for extending the fixed pipe 41, so that the distance between the bottom of the movable pipe 42 and the bottom of the water sealing cylinder 1 is smaller than the distance between the bottom of the water sealing cylinder 1 and the water outlet pipe 3, therefore, when liquid is left at the bottom of the water sealing cylinder 1, the liquid level can be effectively higher than the bottom of the movable pipe 42, thereby achieving a good water sealing effect, when water is drained at a small flow rate, because the flow rate and impact force of the liquid entering the water sealing cylinder 1 are smaller, the liquid can be smoothly introduced into the fixed pipe 41 from the water inlet pipe 2, and then enters the water sealing cylinder 1 through the movable pipe 42, the liquid level of the water sealing cylinder 1 rises and overflows through the water outlet pipe 3 to be discharged into a building drainage pipeline, thereby completing the conventional drainage work of sanitary ware, and simultaneously maintaining the water sealing deodorization effect during non-drainage.
Referring to fig. 3 and 4, wherein the side of the fixed pipe 41 close to the water outlet pipe 3 is provided with a water outlet 411, as shown in fig. 2 and 3, when water is normally sealed, liquid remains in the water sealing cylinder 1, wherein the movable pipe 42 made of plastic material can generate better buoyancy to be directly regarded as a floating block 5, or additionally, the movable pipe 42 is thickened, provided with a bump and a convex rib, and provided with an additional floating block 5, so as to increase the overall buoyancy of the movable pipe 42, so that the movable pipe 42 moves upwards in the water sealing cylinder 1 due to the buoyancy effect until the movable pipe 42 seals the water outlet 411, since the movable pipe 42 needs the liquid to keep floating, the bottom end of the movable pipe 42 is always located below the liquid level, and since odor cannot be discharged through the water outlet 411 under the normal water sealing condition, a normal water sealing deodorization effect is formed, referring to fig. 5, when the movable pipe 42 is far away from the fixed pipe 41 and water is drained from the water conduit, and the liquid flows through the throat 421, the liquid flow is limited by the throat 421 to cause a large amount of water flow impact force to directly act on the movable pipe 42, so that the movable pipe 42 overcomes buoyancy and friction between the movable pipe 42 and the fixed pipe 41 to move downwards, the water outlet 411 is opened, a large amount of liquid is rapidly discharged to the water outlet pipe 3 through the water outlet 411, and a large amount of waste water is drained without passing through the bottom of the water sealing cylinder 1 with a small flow, therefore, the drainage efficiency is effectively improved, and the structure of the existing water sealing cylinder 1 is not required to be changed, after the drainage is completed, because the height of the water outlet pipe 3 is high, the liquid from the liquid level to the position of the water outlet pipe 3 is still retained in the water sealing cylinder 1, and the movable pipe 42 still floats upwards to seal the water outlet 411 due to the buoyancy, thereby achieving the effect of water seal deodorization and restoration.
As shown in fig. 2 and 3, when the water discharge is small and the movable pipe 42 cannot be flushed by water flow to move downward, the liquid can still flow to the bottom of the water seal cylinder 1 along the movable pipe 42 and then flow to the water outlet pipe 3 along the outer wall of the movable pipe 42 and the inside of the water seal cylinder 1 to be discharged, so that a good water discharge and water seal deodorization effect is still maintained, the water seal water conduit reaches the large-flow automatic opening and closing water discharge opening 411, a good water discharge flow automatic adjustment is achieved, meanwhile, the restoration effect is effectively reset, and the water discharge efficiency during large-flow water discharge is effectively improved.
As shown in fig. 2 and 3, a limiting step 412 for limiting the top end of the movable tube 42 to abut against is disposed on the outer wall of the fixed tube 41, the limiting step 412 is located above the water outlet 411, when the movable tube 42 is upwards floated due to buoyancy, the top of the movable tube 42 can directly abut against the limiting step 412, in order to facilitate the relative movement between the movable tube 42 and the fixed tube 41, a micro gap for moving up and down exists between the movable tube 42 and the fixed tube 41, due to the limitation of the limiting step 412, the closed point between the movable tube 42 and the fixed tube 41 is at the position where the limiting step 412 abuts against the top of the movable tube 42, thereby achieving the effective closing of the movable tube 42 and the fixed tube 41, avoiding the exhaust gas from being discharged through the micro gap between the movable tube 42 and the fixed tube 41, and also avoiding the movable tube 42 from excessively upwards floating, and meanwhile, the water outlet 411 can be accurately closed by the movable tube 42.
As shown in fig. 2 and 3, the length from the limiting step 412 to the bottom end of the fixed tube 41 is smaller than the distance from the top end of the movable tube 42 to the throat 421, so as to avoid the influence on the normal up-and-down movement of the movable tube 42 caused by the large friction force generated by the contact between the throat 421 and the fixed tube 41.
As shown in fig. 2 and 3, a plurality of floating blocks 5 are circumferentially arranged on the outer wall of the movable tube 42, wherein the number of the floating blocks 5 is preferably three, the floating blocks 5 are abutted against the inner wall of the water seal cylinder 1, the floating blocks 5 not only provide relatively uniform buoyancy for each position of the movable tube 42, and avoid the excessive friction force between the floating blocks 5 and the inner wall of the water seal cylinder 1, wherein the floating blocks 5 are in a bar shape, the length direction of the floating blocks 5 is the same as that of the movable tube 42, so as to reduce the deflection phenomenon of the movable tube 42, and the stability of the movable tube 42 during moving is improved by abutting the floating blocks 5 against the inner wall of the water seal cylinder 1 during moving, the floating blocks 5 are arranged in the same direction as the water flow, so as to reduce the influence of the floating blocks 5 on the water flow, wherein a floating cavity 51 is arranged in the floating blocks 5, and the floating cavity 51 effectively improves the buoyancy of the floating blocks 5.
As shown in fig. 2 and 3, the bottom of the water seal cylinder 1 is provided with a replacing port 11, the replacing port 11 is connected with a closing plate 12 in a threaded manner, and the replacing port 11 is convenient for replacing the water seal pipe 4 and cleaning the inside of the water seal cylinder 1.
The implementation principle of the water seal water conduit of the embodiment of the application is as follows: in the process of small-flow drainage, when the movable pipe 42 cannot be flushed by water flow and moves downwards, liquid can flow to the bottom of the water seal cylinder 1 along the movable pipe 42 and then overflows to the water outlet pipe 3 along the outer wall of the movable pipe 42 and the inside of the water seal cylinder 1 to be discharged, so that good drainage and water seal deodorization effects are still kept.
In large-traffic drainage in-process, when the flow of liquid passes through throat 421, because the liquid flow receives the restriction of the little flow of throat 421, lead to a large amount of rivers impact force direct action to movable pipe 42, make movable pipe 42 overcome buoyancy and movable pipe 42 and fixed pipe 41's frictional force produce the downstream, therefore outlet 411 can be opened, make a large amount of liquid pass through outlet 411 quick discharge on outlet pipe 3, thereby a large amount of waste water drainage can not pass through the water seal section of thick bamboo 1 bottom of less flow, consequently the effectual efficiency that promotes the drainage.
And no matter the movable pipe 42 moves in the process of large-flow drainage or small-flow drainage, the liquid from the liquid level to the position of the water outlet pipe 3 still remains in the water seal cylinder 1, so that the movable pipe 42 still floats upwards due to the buoyancy effect to seal the drainage outlet 411, and the effect of water seal deodorization resetting is achieved.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (8)
1. The utility model provides a water seal leading pipe, includes water seal section of thick bamboo (1) to and connect inlet tube (2) at water seal section of thick bamboo (1) top and connect outlet pipe (3) at water seal section of thick bamboo (1) lateral wall, be equipped with water seal pipe (4) in water seal section of thick bamboo (1), water seal pipe (4) top communicates with each other with inlet tube (2), water seal pipe (4) bottom is located between water seal section of thick bamboo (1) bottom and outlet pipe (3), water seal pipe (4) diameter is less than water seal section of thick bamboo (1) diameter, its characterized in that: water seal pipe (4) are including fixed pipe (41) and activity pipe (42), fixed pipe (41) top is fixed in water seal section of thick bamboo (1) top, activity pipe (42) cover is at fixed pipe (41) other end, fixed pipe (41) are close to and are equipped with outlet (411) on outlet pipe (3) side, activity pipe (42) are kept away from fixed pipe (41) one end and are equipped with throat (421), be equipped with floating block (5) on activity pipe (42).
2. The water seal diversion pipe of claim 1, wherein: the outer wall of the fixed pipe (41) is provided with a limiting step (412) for the top end of the movable pipe (42) to abut against and limit, and the limiting step (412) is located above the water outlet (411).
3. The water seal diversion pipe of claim 2, wherein: the length from the limiting step (412) to the bottom end of the fixed pipe (41) is smaller than the distance from the top end of the movable pipe (42) to the necking opening (421).
4. The water seal penstock of claim 1, characterized in that: the plurality of floating blocks (5) are circumferentially arranged on the movable pipe (42).
5. The water seal penstock of claim 4, characterized in that: the floating block (5) is fixed on the outer wall of the movable pipe (42), and the floating block (5) is abutted against the inner wall of the water seal cylinder (1).
6. The water seal diversion pipe of claim 5, wherein: the floating block (5) is strip-shaped, and the length direction of the floating block (5) is the same as that of the movable pipe (42).
7. The water seal diversion pipe of claim 1, wherein: a floating cavity (51) is arranged in the floating block (5).
8. The water seal diversion pipe of claim 1, wherein: the water seal cylinder (1) is characterized in that a replacement port (11) is formed in the bottom of the water seal cylinder (1), and a closing plate (12) is connected to the replacement port (11) in a threaded mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110224293.1A CN112962734B (en) | 2021-03-01 | 2021-03-01 | Water seal diversion pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110224293.1A CN112962734B (en) | 2021-03-01 | 2021-03-01 | Water seal diversion pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112962734A CN112962734A (en) | 2021-06-15 |
| CN112962734B true CN112962734B (en) | 2022-07-19 |
Family
ID=76276170
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110224293.1A Active CN112962734B (en) | 2021-03-01 | 2021-03-01 | Water seal diversion pipe |
Country Status (1)
| Country | Link |
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| CN (1) | CN112962734B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103306344A (en) * | 2013-06-27 | 2013-09-18 | 郑州航空工业管理学院 | Assembled odor-resistant floor drain |
| CN210767152U (en) * | 2019-10-15 | 2020-06-16 | 重庆金科建筑设计研究院有限公司 | Deep water seal floor drain capable of thoroughly deodorizing |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3041353C2 (en) * | 1980-11-03 | 1982-10-07 | E. Schmitz KG & Schoeller Kunststoff-Zentrale GmbH, 5000 Köln | Floor drain with a collecting cup open at the top |
| DE19649239A1 (en) * | 1996-06-27 | 1998-01-02 | Scheffer Ohg Franz | Drain fitting with adjustable immersion pipe and welded housing |
| DE202004020132U1 (en) * | 2004-12-30 | 2005-03-10 | Gunter Vetter Heizung-Sanitär | Hygiene/safety water trap for domestic use and use in comprises a siphon container, settling surface, ventilation device, float housing, suction-regulating valve, lifting valve, buoyancy balloon, and base seal |
| CN203008062U (en) * | 2012-12-31 | 2013-06-19 | 攀钢集团工程技术有限公司 | Odor-resistant and anti-blocking floor drain |
| CN203498992U (en) * | 2013-08-25 | 2014-03-26 | 蓝坤林 | Dual-seal odor-resistant floor drain |
| CN203684351U (en) * | 2013-12-06 | 2014-07-02 | 谢水清 | Long-efficiency fully-closed water-seal deodorization water trap |
| CN206591576U (en) * | 2017-03-24 | 2017-10-27 | 泉州科发卫浴有限公司 | A kind of Anti-odor sewer device with soft readjustment function |
| CN212506563U (en) * | 2020-05-14 | 2021-02-09 | 台州新三和卫浴股份有限公司 | Drainer water conduit |
-
2021
- 2021-03-01 CN CN202110224293.1A patent/CN112962734B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103306344A (en) * | 2013-06-27 | 2013-09-18 | 郑州航空工业管理学院 | Assembled odor-resistant floor drain |
| CN210767152U (en) * | 2019-10-15 | 2020-06-16 | 重庆金科建筑设计研究院有限公司 | Deep water seal floor drain capable of thoroughly deodorizing |
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| CN112962734A (en) | 2021-06-15 |
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