CN114014386B - Waste water recovery device of purifier - Google Patents

Waste water recovery device of purifier Download PDF

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Publication number
CN114014386B
CN114014386B CN202111185909.5A CN202111185909A CN114014386B CN 114014386 B CN114014386 B CN 114014386B CN 202111185909 A CN202111185909 A CN 202111185909A CN 114014386 B CN114014386 B CN 114014386B
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CN
China
Prior art keywords
waste water
guide rail
recycling bin
shift out
water recycling
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Active
Application number
CN202111185909.5A
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Chinese (zh)
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CN114014386A (en
Inventor
姜国平
欧阳香娥
陈德喜
魏小武
夏智芳
张明磊
汪志诚
王值权
李树安
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shanghai K Clean Water Purification Equipment Co ltd
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Shanghai K Clean Water Purification Equipment Co ltd
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Priority to CN202111185909.5A priority Critical patent/CN114014386B/en
Publication of CN114014386A publication Critical patent/CN114014386A/en
Application granted granted Critical
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00Apparatus for treatment of water, waste water or sewage
    • C02F2201/002Construction details of the apparatus

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  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Filtration Of Liquid (AREA)
  • Removal Of Floating Material (AREA)

Abstract

The invention discloses a wastewater recovery device of a water purifier, which belongs to the technical field of wastewater recovery and comprises a wastewater recovery barrel, wherein a removal roller is arranged on the lower surface of the wastewater recovery barrel, a removal device is arranged below the removal roller, a clamping device is arranged on the surface of the removal device, the removal device comprises a removal guide rail, and a removal bracket is movably arranged in the removal guide rail. The wastewater recovery device of the water purifier is convenient for the wastewater recovery barrel to move out of the deep area in the cabinet to the external area, reduces the difficulty of moving out of the wastewater recovery barrel after the weight of the wastewater is increased, also relieves the limitation of narrow operation space in the pipeline cabinet and inconvenient object taking.

Description

Waste water recovery device of purifier
Technical Field
The invention relates to the technical field of wastewater recovery, in particular to a wastewater recovery device of a water purifier.
Background
The water purifier is also called a water purifier and a water quality purifier, is water treatment equipment for carrying out deep filtration and purification treatment on water according to the use requirement of the water, generally refers to a small-sized purifier used in families, can be divided into a gradually tightening type water purifier and a self-cleaning type water purifier according to pipeline design grades, is a gradually tightening type water purifier, has an internal pipeline designed with a filter element which is loose before and loose after, and is formed by sequentially connecting a PP melt-blown filter element, granular carbon, compressed carbon, RO reverse osmosis membrane or ultrafiltration membrane and post-positioned activated carbon, and is generally formed by connecting 5 stages end to end. The trapped matters are deposited in the filter element, and are required to be manually disassembled and washed periodically so as to ensure the normal operation of the machine, the other type is a more advanced self-cleaning water purifier, two channels are designed in the machine, a washing water passage is additionally arranged, the washing water used as ordinary domestic water is used for flushing the raw water side of the filter element in the machine, particularly the membrane filter element, so as to achieve the self-cleaning effect, and the trapped dirt is timely and quickly discharged by utilizing the instant of opening and closing the washing water tap, namely the water which is originally discharged from the head section and the tail section.
At present, the ratio of water quantity and wastewater discharge needed by the water purification machine during water purification work is basically one to one, which causes water resource waste, and when the water purification machine is used by a common family, a wastewater collecting barrel is arranged at a drain pipe of the water purification machine so as to collect and utilize the wastewater which does not reach the standard, however, the existing wastewater collecting barrel is generally arranged in a pipeline cabinet, the space of the pipeline cabinet is narrow, the wastewater collecting barrel is taken out more inconveniently, and the difficulty of taking out the wastewater collecting barrel for containing water and increasing weight is larger.
Disclosure of Invention
The invention mainly aims to provide a wastewater recovery device of a water purifier, which can effectively solve the problems that the prior wastewater collection barrel is generally placed in a pipeline cabinet, the space of the pipeline cabinet is narrow, the wastewater collection barrel is taken out more conveniently, and the difficulty in taking out the wastewater collection barrel with increased weight by water is higher.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the utility model provides a waste water recovery device of purifier, includes the waste water recovery bucket, the lower surface of waste water recovery bucket is provided with shifts out the gyro wheel, the below of shifting out the gyro wheel is provided with the shift out the device, the surface of shift out the device is provided with clamping device, the shift out the device is including shifting out the guide rail, the inside movable mounting who shifts out the guide rail has the support of shifting out, a terminal surface fixed mounting who shifts out the guide rail has the ground connection mounting panel, spacing mounting hole has been seted up on the surface of ground connection mounting panel, clamping device includes elevating support, spacing knob, vertical lift screw and elastic tube clamp, elevating support's surface movable mounting has vertical lift screw, vertical lift screw's surface cover is equipped with spacing knob, vertical lift screw's up end fixed mounting has the elastic tube clamp, and elastic tube clamp can carry out the centre gripping to the drain, can prevent also to lead to the drain to the displacement after shifting the waste water recovery bucket from the waste water recovery bucket during the use to the use through vertical lift screw on elevating support, thereby adapt to the use of different co-altitude waste water bucket.
As a further improvement of the scheme, the moving-out support comprises a connecting support plate, a push-pull supporting block is fixedly arranged on the surface of the connecting support plate, a moving-out pull ring is fixedly arranged on the surface of the connecting support plate, a pull ring finger groove is formed in the inner area of the moving-out pull ring, the two push-pull supporting blocks are connected through the connecting support plate, and the moving-out pull ring is positioned in the middle of one side surface of the connecting support plate and is fixed.
As a further improvement of the scheme, the inside of the moving-out guide rail is provided with a roller chute, and the inside of the moving-out guide rail, which is positioned below the roller chute, is provided with a guide sliding hole.
As a further improvement of the scheme, two groups of moving-out guide rails are symmetrically arranged at the connecting support plate, the moving-out guide rails are fixed with the ground through the grounding mounting plate, and roller sliding grooves and guide sliding holes in the moving-out guide rails are communicated.
As the further improvement of above-mentioned scheme, waste water recycling bin is through shifting out the gyro wheel in the gyro wheel spout department horizontal migration of shifting out the guide rail, connect the extension board and shift out the direction slide hole sliding connection of guide rail, push-and-pull support piece is in shifting out the gyro wheel spout department horizontal slip of guide rail, when waste water recycling bin takes out, outwards pulling shifts out the pull ring, drive and connect the extension board and slide in shifting out the direction slide hole of guide rail, simultaneously push-and-pull support piece is in shifting out the gyro wheel spout department removal of guide rail, push-and-pull support piece laminating shifts out the surface of gyro wheel and outwards promotes for waste water recycling bin shifts out the external area from the interior depth area of cabinet, has reduced the removal degree of difficulty after waste water recycling bin flourishing weight gain, has also alleviated the narrow and small limitation of getting the thing of operating space in the pipeline cabinet.
As a further improvement of the scheme, a drain pipe penetrating port is formed in the elastic pipe clamp, and a drain pipe embedding port is formed in one side of the elastic pipe clamp.
As a further improvement of the scheme, the lifting support is fixedly connected with the surface of the moving-out guide rail, the height of the lowest end of the lifting support is flush with the height of the lower surface of the moving-out guide rail, the inner wall of the limiting knob is provided with spiral lines, the outer surface of the limiting knob is provided with anti-skid lines, the limiting knob is in threaded connection with the vertical lifting screw, the elastic pipe clamp vertically slides on the surface of the lifting support through the vertical lifting screw, and is limited after propping against the lifting support in the vertical direction through the limiting knob.
As a further improvement of the scheme, a waste water dumping port is fixedly arranged on one side surface of the waste water recycling bin, a drain pipe opening is formed in the upper edge of the other side surface of the waste water recycling bin, lifting handles are fixedly arranged on the surfaces of two adjacent sides of the waste water dumping port, the lifting handles are fixedly connected with the edge of the upper port of the waste water recycling bin, and a waste water collecting cavity is formed in the waste water recycling bin.
As the further improvement of above-mentioned scheme, the elastic tube clamp is located waste water recovery bucket's blow off pipe opening one side setting, and the elastic tube clamp highly accords with waste water recovery bucket's last port, waste water dumping port is linked together with waste water recovery bucket's waste water collecting chamber, shift out the gyro wheel and be located waste water recovery bucket's below and be provided with four groups altogether, waste water recovery bucket is unsettled to be placed in ground.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, the connecting support plate slides in the guide sliding hole of the shifting-out guide rail through the shifting-out device, meanwhile, the push-pull propping block moves at the roller chute of the shifting-out guide rail, and the push-pull propping block is attached to the surface of the shifting-out roller and pushes outwards, so that the wastewater recycling bin is shifted out from a deep area in the cabinet to an external area, the shifting-out difficulty of the wastewater recycling bin after water is filled and weight is increased is reduced, the limitation of inconvenient fetching of objects due to narrow operation space in the pipeline cabinet is relieved, and the elastic pipe clamp with elasticity can clamp and fix the sewage pipe through the clamping device, so that the sewage pipe can be prevented from sliding out from the wastewater recycling bin during daily use, and the displacement of the sewage pipe caused by the shifting of the wastewater recycling bin is prevented.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present invention;
FIG. 2 is a schematic view of a removing device according to the present invention;
FIG. 3 is a schematic view of a removal bracket according to the present invention;
FIG. 4 is a schematic view of a moving-out guide rail structure according to the present invention;
FIG. 5 is a schematic view of a clamping device according to the present invention;
FIG. 6 is a schematic diagram of the structure of the wastewater recycling bin of the invention.
In the figure: 1. a wastewater recycling bin; 2. a removal device; 3. a clamping device; 4. removing the roller; 5. removing the guide rail; 6. removing the bracket; 7. connecting a support plate; 8. removing the pull ring; 9. pushing and pulling the supporting block; 10. a pull ring finger groove; 11. lifting the support; 12. a limit knob; 13. a vertical lifting screw; 14. an elastic tube clamp; 15. a blow-down pipe penetrating opening; 16. a drain pipe is embedded into the port; 17. a roller chute; 18. a guide slide hole; 19. a ground mounting plate; 20. limiting the mounting hole; 21. a drain pipe opening; 22. lifting the handle; 23. a waste water dumping port; 24. a waste water collection chamber.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
As shown in fig. 1-6, a waste water recovery device of purifier, including waste water recovery bucket 1, waste water recovery bucket 1's lower surface is provided with shifts out gyro wheel 4, shift out the below of gyro wheel 4 and be provided with shift out device 2, shift out the surface of device 2 and be provided with clamping device 3, shift out device 2 includes shift out guide rail 5, shift out the inside movable mounting of guide rail 5 and shift out support 6, shift out the one end fixed mounting who shifts out guide rail 5 has ground connection mounting plate 19, spacing mounting hole 20 has been seted up on ground connection mounting plate 19's surface, clamping device 3 includes lift support 11, spacing knob 12, vertical lift screw 13 and elastic tube clamp 14, the surface movable mounting of lift support 11 has vertical lift screw 13, the surface cover of vertical lift screw 13 is equipped with spacing knob 12, the up end fixed mounting of vertical lift screw 13 has elastic tube clamp 14, elastic tube clamp 14 can carry out the centre gripping to the blow off pipe, can prevent both that the blow off pipe from slipping out in waste water recovery bucket 1 when using, also prevent that waste water recovery bucket 1 from shifting back from leading to the displacement, in the use, elastic tube clamp 14 through vertical lift screw 13 slides on lift support 11, thereby the height is high to adapt to daily use of waste water recovery bucket 1.
The shifting-out support 6 comprises a connecting support plate 7, a push-pull supporting block 9 is fixedly arranged on the surface of the connecting support plate 7, a shifting-out pull ring 8 is fixedly arranged on the surface of the connecting support plate 7, a pull ring finger groove 10 is formed in the inner area of the shifting-out pull ring 8, the two push-pull supporting blocks 9 are connected through the connecting support plate 7, and the shifting-out pull ring 8 is located on the middle of one side surface of the connecting support plate 7 and is fixed.
The inside of the moving-out guide rail 5 is provided with a roller chute 17, and the inside of the moving-out guide rail 5 is provided with a guide sliding hole 18 below the roller chute 17.
Two groups of moving-out guide rails 5 are symmetrically arranged at the connecting support plate 7, the moving-out guide rails 5 are fixed with the ground through a grounding mounting plate 19, and roller sliding grooves 17 and guide sliding holes 18 in the moving-out guide rails 5 are communicated.
In this embodiment, waste water recycling bin 1 moves horizontally through removing gyro wheel 4 in the gyro wheel spout 17 department of removing guide rail 5, connect extension board 7 and the direction slide hole 18 sliding connection of removing guide rail 5, push-pull supporting piece 9 is in the gyro wheel spout 17 department horizontal slip of removing guide rail 5, when waste water recycling bin 1 takes out, pull out pull ring 8 outwards, drive connect extension board 7 and slide in the direction slide hole 18 of removing guide rail 5, push-pull supporting piece 9 moves in the gyro wheel spout 17 department of removing guide rail 5 simultaneously, push-pull supporting piece 9 laminating shifts out the surface of gyro wheel 4 and outwards promotes, make waste water recycling bin 1 shift out to outside area from the interior deep area of cabinet, the removal degree of difficulty after waste water recycling bin 1 flourishing weight has been reduced, the narrow and small limitation of inconvenient material of getting of interior operating space of pipeline cabinet has also been alleviated.
The inside of the elastic tube clamp 14 is provided with a drain pipe penetrating opening 15, and one side of the elastic tube clamp 14 is provided with a drain pipe embedding port 16.
The lifting support 11 is fixedly connected with the surface of the moving-out guide rail 5, the height of the bottommost end of the lifting support 11 is flush with the height of the lower surface of the moving-out guide rail 5, the inner wall of the limiting knob 12 is provided with spiral lines, the outer surface of the limiting knob 12 is provided with anti-skid lines, the limiting knob 12 is in threaded connection with the vertical lifting screw 13, the elastic pipe clamp 14 vertically slides on the surface of the lifting support 11 through the vertical lifting screw 13, and is limited after propping against the lifting support 11 in the vertical direction through the limiting knob 12.
One side surface fixed mounting of waste water recycling bin 1 has waste water to empty port 23, and waste pipe opening 21 has been seted up to waste water recycling bin 1 opposite side surface upper edge department, and waste water is empty the equal fixed mounting in both sides surface adjacent of port 23 and is lifted handle 22, lifts handle 22 and waste water recycling bin 1's upper port edge fixed connection, and waste water recycling bin 1's inside is provided with waste water collection chamber 24.
The elastic tube clamp 14 is located the blow off pipe opening 21 one side setting of waste water recovery bucket 1, and the elastic tube clamp 14 highly accords with the last port of waste water recovery bucket 1, and waste water dumping port 23 is linked together with the waste water collecting chamber 24 of waste water recovery bucket 1, shifts out gyro wheel 4 and is located the below of waste water recovery bucket 1 and is provided with four sets ofly altogether, and waste water recovery bucket 1 is unsettled to be placed in the ground.
It should be noted that, the invention is a waste water recovery device of a water purifier, before use, drive in the screw to spacing mounting hole 20 department of ground connection mounting panel 19, make shift out guide rail 5 and ground fixed, four shift out gyro wheels 4 of waste water recovery bucket 1 place in the gyro wheel spout 17 department of shift out guide rail 5, waste water recovery bucket 1 is located the pipeline cabinet in the kitchen and sets up, the drain pipe of water purifier moves into the drain pipe through-hole 15 from the drain pipe embedding port 16 of elastic pipe clamp 14, afterwards, the drain pipe laminating drain pipe opening 21 of water purifier stretches into waste water collection chamber 24 of waste water recovery bucket 1, possess elastic pipe clamp 14 can carry out the centre gripping fixed to the drain pipe, can prevent to shift out the drain pipe from waste water recovery bucket 1 during daily use, also prevent that waste water recovery bucket 1 from shifting the back and leading to the drain pipe displacement, in the use, elastic pipe clamp 14 is through vertical lift screw 13 on lift support 11 and go up and down, thereby adapt to the use of different height waste water recovery bucket 1, when taking out in 1, pull out, drive out and connect the drain pipe clamp 7 outside and shift out guide rail cabinet 5 and shift out guide rail cabinet 9 and take out the drain pipe 9 and move out the drain pipe side by force, the place the drain pipe from the inside the place, the drain pipe side of the place, the place of the side of the drain pipe is moved out of the place, and is difficult for removing from the place, and is reduced and is moved out from the drain pipe side 9 has moved outside in the place, and is moved out from the place.
The foregoing has shown and described the basic principles and main features of the present invention and the advantages of the present invention. Although embodiments of the present invention have been shown and described, it is therefore not intended to limit the scope of the invention to the equivalent structures or equivalent processes using the description of the invention and the accompanying drawings, or to use directly or indirectly in other related technical fields, which are equally encompassed by the scope of the invention, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations of these embodiments may be made without departing from the principle and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims (5)

1. The utility model provides a waste water recovery unit of purifier which characterized in that: including waste water recycling bin (1), the lower surface of waste water recycling bin (1) is provided with and shifts out gyro wheel (4), the below of shifting out gyro wheel (4) is provided with out device (2), the surface of shifting out device (2) is provided with clamping device (3), shift out device (2) including shifting out guide rail (5), shift out the inside movable mounting of guide rail (5) and shift out support (6), shift out one end face fixed mounting of guide rail (5) and have ground connection mounting plate (19), spacing mounting hole (20) have been seted up on the surface of ground connection mounting plate (19), clamping device (3) are including lifting support (11), spacing knob (12), vertical lift screw (13) and elastic tube clamp (14), the surface movable mounting of lifting support (11) has vertical lift screw (13), the surface cover of vertical lift screw (13) is equipped with spacing knob (12), the up end fixed mounting of vertical lift screw (13) has elastic tube clamp (14), shift out support (6) including connecting extension board (7), the fixed surface mounting of extension board (7) has pull ring (7), the utility model provides a pull ring finger groove (10) is provided with to the inside region of shifting out pull ring (8), two push-and-pull support piece (9) are connected through connecting extension board (7), shift out pull ring (8) and be located one side surface middle part position fixing of connecting extension board (7), shift out gyro wheel spout (17) have been seted up to the inside of guide rail (5), shift out guide rail (5) inside and be located gyro wheel spout (17) below and seted up guide slide hole (18), shift out guide rail (5) are located and connect extension board (7) department symmetry and are provided with two sets of, shift out guide rail (5) are fixed with ground through ground connection mounting board (19), shift out inside gyro wheel spout (17) of guide rail (5) and guide slide hole (18) are linked together, waste water recycling bin (1) is through shifting out gyro wheel spout (17) department horizontal migration of gyro wheel (4) of guide rail (5), connect extension board (7) and shift out guide slide hole (18) sliding connection of guide rail (5), push-and-pull piece (9) are located the horizontal slide of shift out gyro wheel (17) of guide rail (5).
2. The water purifier waste water recovery device according to claim 1, wherein: the inside of elastic tube clamp (14) is provided with blow off pipe through-hole (15), blow off pipe embedding port (16) have been seted up to one side of elastic tube clamp (14).
3. The water purifier waste water recovery device according to claim 2, wherein: lifting support (11) and the fixed surface who shifts out guide rail (5) are connected, and lifting support (11) lower extreme height and shift out the lower surface height of guide rail (5) flush, the inner wall of spacing knob (12) is provided with the spiral line, the surface of spacing knob (12) is provided with the antiskid line, spacing knob (12) and vertical lift screw (13) threaded connection, elastic tube clamp (14) are through vertical lift screw (13) at lifting support (11) surface vertical sliding, and support behind lifting support (11) spacing through spacing knob (12) vertical direction.
4. A water purifier waste water recovery device according to claim 3, wherein: one side fixed surface of waste water recycling bin (1) installs waste water and empties port (23), drain pipe opening (21) have been seted up to waste water recycling bin (1) opposite side surface upper edge department, adjacent both sides surface of waste water dumping port (23) all fixed mounting has and mentions handle (22), mention the last port edge fixed connection of handle (22) and waste water recycling bin (1), the inside of waste water recycling bin (1) is provided with waste water collecting chamber (24).
5. The water purifier wastewater recovery device according to claim 4, wherein: the utility model discloses a waste water recycling bin, including waste water recycling bin (1), waste water collection chamber (24), waste water pouring port (23), waste water recycling bin (1), elastic tube clamp (14) are located waste water recycling bin (1) blow off pipe opening (21) one side setting, and elastic tube clamp (14) highly conform with waste water recycling bin (1) last port, waste water pouring port (23) are linked together with waste water collection chamber (24) of waste water recycling bin (1), shift out gyro wheel (4) and be provided with four altogether below of waste water recycling bin (1), waste water recycling bin (1) are unsettled to be placed in ground.
CN202111185909.5A 2021-10-12 2021-10-12 Waste water recovery device of purifier Active CN114014386B (en)

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Application Number Priority Date Filing Date Title
CN202111185909.5A CN114014386B (en) 2021-10-12 2021-10-12 Waste water recovery device of purifier

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Application Number Priority Date Filing Date Title
CN202111185909.5A CN114014386B (en) 2021-10-12 2021-10-12 Waste water recovery device of purifier

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CN114014386B true CN114014386B (en) 2023-09-01

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0806162A1 (en) * 1996-05-07 1997-11-12 Alfit Aktiengesellschaft Guide for drawers
CA2832599A1 (en) * 2011-04-07 2012-10-11 Brian H. Smith Sliding door
KR20150047094A (en) * 2013-10-23 2015-05-04 박만선 Apparatus and Method for treating excrement while recycling wastewater
JP3197713U (en) * 2015-02-17 2015-06-04 明正 須藤 Wastewater collection container and water storage container
CN206108104U (en) * 2016-08-31 2017-04-19 北京大学深圳医院 Medical waste collection vehicle of improvement type
CN112823725A (en) * 2019-11-20 2021-05-21 陕西学考乐信息科技有限公司 Intelligent water dispenser for office
CN214344632U (en) * 2021-02-01 2021-10-08 王丽 Sewage treatment plant for environmental protection

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0806162A1 (en) * 1996-05-07 1997-11-12 Alfit Aktiengesellschaft Guide for drawers
CA2832599A1 (en) * 2011-04-07 2012-10-11 Brian H. Smith Sliding door
KR20150047094A (en) * 2013-10-23 2015-05-04 박만선 Apparatus and Method for treating excrement while recycling wastewater
JP3197713U (en) * 2015-02-17 2015-06-04 明正 須藤 Wastewater collection container and water storage container
CN206108104U (en) * 2016-08-31 2017-04-19 北京大学深圳医院 Medical waste collection vehicle of improvement type
CN112823725A (en) * 2019-11-20 2021-05-21 陕西学考乐信息科技有限公司 Intelligent water dispenser for office
CN214344632U (en) * 2021-02-01 2021-10-08 王丽 Sewage treatment plant for environmental protection

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