阅读说明：本技术 一种实验室废液浓缩装置 (Laboratory waste liquid enrichment facility ) 是由 刘卫蓉 黄亮 张威 张明 刘伟平 于 2021-09-27 设计创作，主要内容包括：本申请涉及一种实验室废液浓缩装置,涉及实验室废水处理的领域,其包括废液箱、浓缩装置和集液箱；所述浓缩装置包括蒸发箱、加热件和冷凝机构,所述废液箱与所述蒸发箱之间设有进液管,且所述废液箱和所述蒸发箱之间通过所述进液管相连通,所述进液管上设有抽液泵,所述蒸发箱的下端设有出液管,所述出液管上设有阀门,所述加热件设于所述蒸发箱下方,所述冷凝机构设于所述蒸发箱的一侧,所述冷凝机构与所述蒸发箱的上端相连通,所述集液箱设于所述冷凝机构的出液口。本申请具有便于对实验室废液进行浓缩,降低实验室废液处理成本的效果。(The application relates to a laboratory waste liquid concentration device, which relates to the field of laboratory waste water treatment and comprises a waste liquid tank, a concentration device and a liquid collection tank; the enrichment facility includes evaporation tank, heating member and condensing mechanism, the waste liquid case with be equipped with the feed liquor pipe between the evaporation tank, just the waste liquid case with pass through between the evaporation tank the feed liquor pipe is linked together, be equipped with the drawing liquid pump on the feed liquor pipe, the lower extreme of evaporation tank is equipped with the drain pipe, be equipped with the valve on the drain pipe, the heating member is located the evaporation tank below, condensing mechanism locates one side of evaporation tank, condensing mechanism with the upper end of evaporation tank is linked together, the liquid collecting tank is located the liquid outlet of condensing mechanism. This application has and is convenient for concentrate the laboratory waste liquid, reduces the effect of laboratory waste liquid treatment cost.)

1. The utility model provides a laboratory waste liquid enrichment facility which characterized in that: comprises a waste liquid box (1), a concentration device (2) and a liquid collection box (3);

enrichment facility (2) are including evaporating case (21), heating member (22) and condensation mechanism (23), waste liquid case (1) with be equipped with feed liquor pipe (4) between evaporating case (21), just waste liquid case (1) with pass through between evaporating case (21) feed liquor pipe (4) are linked together, be equipped with drawing liquid pump (41) on feed liquor pipe (4), the lower extreme of evaporating case (21) is equipped with drain pipe (211), be equipped with valve (2111) on drain pipe (211), heating member (22) are located evaporating case (21) below, condensation mechanism (23) are located one side of evaporating case (21), condensation mechanism (23) with the upper end of evaporating case (21) is linked together, collection liquid case (3) are located the liquid outlet of condensation mechanism (23).

2. The laboratory waste liquid concentrating apparatus according to claim 1, wherein: the condensing mechanism (23) includes: a distilled water pipe (231) and a condensate pipe (232);

one side of the evaporation box (21) is provided with a gas guide pipe (212), one end of the distilled water pipe (231) is communicated with one end, far away from the evaporation box (21), of the gas guide pipe (212), the other end of the distilled water pipe (231) is communicated with the liquid collection box (3), and the distilled water pipe (231) is obliquely arranged and obliquely arranged from one side of the evaporation box (21) to one side of the liquid collection box (3) downwards;

condensate pipe (232) cover is located on distilled water pipe (231), the periphery wall of distilled water pipe (231) with form condensation chamber (233) between the internal perisporium of condensate pipe (232), the both ends of condensate pipe (232) all with distilled water pipe (231) rigid coupling, condensate pipe (232) are close to the one end of evaporating chamber (21) be equipped with inlet tube (2321) that condensation chamber (233) are linked together, condensate pipe (232) are close to the one end of collection liquid tank (3) be equipped with outlet pipe (2322) that condensation chamber (233) are linked together.

3. The laboratory waste liquid concentrating apparatus according to claim 1, wherein: be equipped with rabbling mechanism (5) on evaporation tank (21), rabbling mechanism (5) including vertical rotation set up in connecting block (51) of upper end in evaporation tank (21), evaporation tank (21) top is equipped with driving motor (52), driving motor's (52) output with connecting block (51) rigid coupling, the relative both sides of connecting block (51) are equipped with puddler (53) respectively.

4. The laboratory waste liquid concentrating apparatus according to claim 3, wherein: the two opposite outer side walls of the connecting block (51) are respectively provided with a sliding groove (511) which is vertically distributed, the two sliding grooves (511) are respectively internally and slidably provided with a sliding block (54), one end, close to the connecting block (51), of each of the two stirring rods (53) is hinged to the two sliding blocks (54) and the hinged axis of each of the two stirring rods is horizontal, a driving assembly (55) is arranged between the evaporation box (21) and the connecting block (51), and the driving assembly (55) is used for driving the two sliding blocks (54) to vertically slide.

5. The laboratory waste liquid concentrating apparatus according to claim 4, wherein: the drive assembly (55) comprises: a screw (551), a gear (552) and a connector (553);

the two screw rods (551) are arranged, the two screw rods (551) are vertically and rotatably arranged in the two sliding grooves (511) respectively, the two sliding blocks (54) are assembled on the two screw rods (551) in a threaded mode respectively, the upper ends of the two screw rods (551) penetrate through the sliding grooves (511) respectively and protrude out of the upper end face of the connecting block (51), the upper ends of the two screw rods (551) are fixedly connected with horizontally arranged gears (552) coaxially respectively, the connecting piece (553) is arranged on the evaporation box (21), and the connecting piece (553) is used for driving the two gears (552) to rotate synchronously.

6. The laboratory waste liquid concentrating apparatus according to claim 5, wherein: the connecting piece (553) is a gear ring (5531), the gear ring (5531) is horizontally and fixedly connected to the inner top wall of the evaporation box (21) and coaxially arranged with the output end of the driving motor (52), and the two gears (552) are meshed with the gear ring (5531).

7. The laboratory waste liquid concentrating apparatus according to claim 6, wherein: one end of the stirring rod (53) far away from the connecting block (51) is provided with a stirring part (531), and the outer peripheral side of the stirring part (531) is always attached to the inner bottom wall of the evaporation box (21).

8. The laboratory waste liquid concentrating apparatus according to claim 1, wherein: one side of collection liquid case (3) is equipped with and is the neutralization pond (6) that the upper end is the opening form, neutralization pond (6) with be equipped with blast pipe (7) between collection liquid case (3), the one end rigid coupling of blast pipe (7) in the upper end of collection liquid case (3) and with collection liquid case (3) are linked together, the other end of blast pipe (7) stretches into in neutralization pond (6).

Technical Field

The application relates to the field of laboratory waste water treatment, in particular to a laboratory waste liquid concentrating device.

Background

Laboratory waste is typically the various solutions generated during the experimental operations, waste generated when washing various laboratory instruments and equipment. When the concentration of the waste liquid is quite rare and safe, the waste liquid can be discharged into the atmosphere or a drainage ditch, and when the concentration of the waste liquid is high, the waste liquid is not allowed to be directly discharged into a sewer and needs to be classified and collected and sent to a professional recovery department for treatment.

The current situation of laboratory waste liquid treatment is mainly centralized collection, and then the laboratory waste liquid is sent to a special treatment mechanism for special treatment, and the special treatment mechanism usually charges according to the volume for the recovery treatment of the laboratory waste liquid, so that the cost is higher.

Disclosure of Invention

In order to facilitate concentrating the laboratory waste liquid, reduce laboratory waste liquid treatment cost, this application provides a laboratory waste liquid enrichment facility.

The application provides a laboratory waste liquid enrichment facility adopts following technical scheme:

a laboratory waste liquid concentrating device comprises a waste liquid box, a concentrating device and a liquid collecting box;

the enrichment facility includes evaporation tank, heating member and condensing mechanism, the waste liquid case with be equipped with the feed liquor pipe between the evaporation tank, just the waste liquid case with pass through between the evaporation tank the feed liquor pipe is linked together, be equipped with the drawing liquid pump on the feed liquor pipe, the lower extreme of evaporation tank is equipped with the drain pipe, be equipped with the valve on the drain pipe, the heating member is located the evaporation tank below, condensing mechanism locates one side of evaporation tank, condensing mechanism with the upper end of evaporation tank is linked together, the liquid collecting tank is located the liquid outlet of condensing mechanism.

By adopting the technical scheme, during work, the valve on the liquid outlet pipe is closed, waste liquid generated in an experiment is poured into the waste liquid box, the experimental waste liquid in the waste liquid box is pumped into the evaporation box through the liquid pump, the experimental waste liquid in the evaporation box is heated through the heating element, so that moisture in the experimental waste liquid is changed into vapor, the vapor enters the condensing mechanism, the condensing mechanism condenses and liquefies the vapor and then leads the vapor out of the evaporation box to the liquid collection box, so that concentrated experimental waste liquid is obtained in the evaporation box, and the concentrated experimental waste liquid can be discharged through the liquid outlet pipe; more moisture in the experimental waste liquid is separated out through the concentration device, the volume of the experimental waste liquid is reduced, and therefore the laboratory waste liquid treatment cost is reduced.

Optionally, the condensing mechanism comprises: a distilled water pipe and a condensate pipe;

one side of the evaporation box is provided with an air guide pipe, one end of the distilled water pipe is communicated with one end of the air guide pipe, which is far away from the evaporation box, the other end of the distilled water pipe is communicated with the liquid collection box, and the distilled water pipe is obliquely arranged and obliquely downwards arranged from one side of the evaporation box to one side of the liquid collection box;

the condensate pipe cover is located on the distilled water pipe, the periphery wall of distilled water pipe with form the condensation chamber between condensate pipe's the internal perisporium, condensate pipe's both ends all with distilled water pipe rigid coupling, condensate pipe is close to the one end of evaporating chamber be equipped with the inlet tube that the condensation chamber is linked together, condensate pipe is close to the one end of collecting tank be equipped with the outlet pipe that the condensation chamber is linked together.

By adopting the technical scheme, the water vapor in the evaporation tank enters the distilled water pipe through the air duct, and at the moment, cold water is injected into the condensation cavity through the water inlet pipe, so that the water vapor in the distilled water pipe flows into the liquid collecting tank after being condensed and liquefied; cold water constantly flows into the condensation chamber from the inlet tube and discharges from the outlet pipe again to carry out abundant condensation liquefaction to the vapor in the distilled water pipe, improve the concentration efficiency of experiment waste liquid.

Optionally, be equipped with rabbling mechanism on the evaporation tank, the rabbling mechanism include vertical rotation set up in the connecting block of upper end in the evaporation tank, the evaporation tank top is equipped with driving motor, driving motor's output with the connecting block rigid coupling, the relative both sides of connecting block are equipped with the puddler respectively.

Through adopting above-mentioned technical scheme, when heating the experiment waste liquid to the evaporation case in, start driving motor, driving motor drive connecting block rotates to it is rotatory to drive two puddlers, stirs the experiment waste liquid to the evaporation case in, accelerates the flow of experiment waste liquid in the evaporation case, thereby improves the evaporation efficiency of moisture in the experiment waste liquid, and then improves the concentration efficiency of experiment waste liquid, saves time.

Optionally, two opposite outer side walls of the connecting block are respectively provided with vertically arranged sliding grooves, two sliding blocks are respectively assembled in the two sliding grooves in a sliding manner, one ends of the two stirring rods, which are close to the connecting block, are respectively hinged to the two sliding blocks, the hinge axes of the two sliding blocks are horizontal, a driving assembly is arranged between the evaporation box and the connecting block, and the driving assembly is used for driving the two sliding blocks to vertically slide simultaneously.

Through adopting above-mentioned technical scheme, during the stirring, through two sliders of drive assembly drive reciprocal sliding in the spout, and then drive the continuous mutual approaching to of puddler on two sliders or keep away from to make the puddler carry out comparatively abundant stirring to the experiment waste liquid in the evaporation case, further accelerate the concentration efficiency of experiment waste liquid.

Optionally, the driving assembly comprises: the screw rod, the gear and the connecting piece;

the screw rod is equipped with two, two the screw rod is vertical rotation respectively and installs in two in the spout, two the slider is respectively threaded assembly in two on the screw rod, two the upper end of screw rod runs through respectively spout and protrusion in the up end of connecting block, two the coaxial rigid coupling respectively of upper end of screw rod has the gear that the level was laid, the connecting piece is located on the evaporation tank, the connecting piece is used for driving two the synchronous rotation of gear.

By adopting the technical scheme, the driving motor drives the connecting block to rotate in the forward direction so as to drive the two gears to rotate, the two gears synchronously rotate through the connecting piece so as to drive the two screw rods to rotate, and the sliding block drives the stirring rod to continuously rise along the vertical direction due to the vertical sliding assembly between the sliding block and the sliding groove, so that the stirring rod gradually moves to the center from two sides of the evaporation box; the driving motor drives the connecting block to rotate reversely, so that the stirring rod can gradually move towards two sides from the center of the evaporation box, and the stirring rod circulates according to the operation, thereby fully stirring the experimental waste liquid in the evaporation box.

Optionally, the connecting piece is a gear ring, the gear ring is horizontally and fixedly connected to the inner top wall of the evaporation box and coaxially arranged with the output end of the driving motor, and the two gears are engaged with the gear ring.

Through adopting above-mentioned technical scheme, when two gears rotated along with the connecting block, because gear and ring gear mesh mutually to make two gears can take place synchronous rotation, save the power supply, reduce enrichment facility's cost.

Optionally, the one end that the puddler kept away from the connecting block is equipped with the stirring portion, the periphery side of stirring portion all the time with the interior diaphram of evaporating case is laminated.

By adopting the technical scheme, the contact area of the stirring rod and the experimental waste liquid in the evaporation box is increased by the stirring part, so that the stirring efficiency of the stirring rod on the experimental waste liquid is higher; stirring portion also can carry out the disturbance to the sediment of diapire in the evaporating box of adhering to simultaneously, makes the evaporating box be difficult for adhering to the sediment in long-time work back bottom, and the experiment waste liquid after the later stage of being convenient for is concentrated is fully discharged, improves the cleaning efficiency of evaporating box.

Optionally, one side of the liquid collecting box is provided with a neutralizing tank with an open upper end, an exhaust pipe is arranged between the neutralizing tank and the liquid collecting box, one end of the exhaust pipe is fixedly connected with the upper end of the liquid collecting box and communicated with the liquid collecting box, and the other end of the exhaust pipe extends into the neutralizing tank.

Through adopting above-mentioned technical scheme, can produce gas such as carbon dioxide and sulfur dioxide in the heating process of partial experiment waste liquid, pass through condensing mechanism and header tank with gas such as carbon dioxide that the heating produced in the evaporating box after, in the leading-in neutralization pond, what add in the neutralization pond has buffer solution, consequently can make gas such as carbon dioxide and sulfur dioxide that produce and buffer solution take place to react, make gas such as carbon dioxide, sulfur dioxide be difficult for discharging polluted environment in the atmosphere.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the waste liquid produced in the experiment is poured into the waste liquid box, the experimental waste liquid in the waste liquid box is pumped into the evaporation box through the liquid pump, the experimental waste liquid in the evaporation box is heated through the heating element, so that the moisture in the experimental waste liquid is changed into water vapor, the concentrated experimental waste liquid is obtained in the evaporation box, the water vapor enters the condensing mechanism, and the condensing mechanism condenses and liquefies the water vapor and guides the condensed and liquefied water vapor into the liquid collection box, so that more moisture in the experimental waste liquid is separated out, the volume of the experimental waste liquid is reduced, and the treatment cost of the laboratory waste liquid is reduced;

2. the driving assembly drives the two sliding blocks to slide in the sliding groove in a reciprocating manner, so that the stirring rods on the two sliding blocks are driven to continuously approach or separate from each other, the experiment waste liquid in the evaporation box is stirred by the stirring rods more fully, and the concentration efficiency of the experiment waste liquid is further accelerated;

3. the buffer solution is added into the neutralization tank, so that gases such as carbon dioxide and sulfur dioxide generated in the heating of the experimental waste liquid can react with the buffer solution, and the gases such as carbon dioxide and sulfur dioxide are not easy to be discharged into the atmosphere to pollute the environment.

Drawings

FIG. 1 is a schematic diagram of the overall structure of an embodiment of the present application;

FIG. 2 is a schematic structural diagram of a stirring mechanism in an embodiment of the present application;

FIG. 3 is a schematic view of the connection structure between the connection block, the driving assembly and the stirring rod in the embodiment of the present application;

fig. 4 is a schematic structural diagram of a condensing mechanism in the embodiment of the present application.

Reference numerals: 1. a waste liquid tank; 2. a concentration device; 21. an evaporation tank; 211. a liquid outlet pipe; 2111. a valve; 212. an air duct; 22. a heating member; 23. a condensing mechanism; 231. a distilled water pipe; 232. a condensate pipe; 2321. a water inlet pipe; 2322. a water outlet pipe; 233. a condensation chamber; 3. a liquid collection tank; 4. a liquid inlet pipe; 41. a liquid pump; 5. a stirring mechanism; 51. connecting blocks; 511. a chute; 52. a drive motor; 53. a stirring rod; 531. a stirring section; 54. a slider; 55. a drive assembly; 551. a screw rod; 552. a gear; 553. a connecting member; 5531. a ring gear; 6. a neutralization pond; 7. an exhaust pipe; 8. a boom.

Detailed Description

The present application is described in further detail below with reference to figures 1-4.

The embodiment of the application discloses laboratory waste liquid enrichment facility. Referring to fig. 1, a laboratory waste liquid concentrating apparatus includes a waste liquid tank 1, a concentrating apparatus 2, and a liquid collecting tank 3; the concentration device 2 comprises an evaporation tank 21, a heating element 22 and a condensation mechanism 23, wherein the waste liquid tank 1 and the evaporation tank 21 are both made of polytetrafluoroethylene materials, a liquid inlet pipe 4 is arranged between the waste liquid tank 1 and the evaporation tank 21, one end of the liquid inlet pipe 4 is fixedly connected to the lower end of the waste liquid tank 1, the other end of the liquid inlet pipe 4 is fixedly connected with the evaporation tank 21, the waste liquid tank 1 and the evaporation tank 21 are communicated through the liquid inlet pipe 4, a liquid suction pump 41 is arranged on the liquid inlet pipe 4, a stirring mechanism 5 is arranged on the evaporation tank 21, a liquid outlet pipe 211 is arranged at the lower end of the evaporation tank 21, a valve 2111 is arranged on the liquid outlet pipe 211, the heating element 22 is an electric heating plate, the electric heating plate is placed below the evaporation tank 21, the condensation mechanism 23 is arranged at one side of the evaporation tank 21, the condensation mechanism 23 is communicated with the upper end of the evaporation tank 21, the liquid outlet of the condensation mechanism 23 is arranged at one side of the liquid collection tank 3, a neutralization tank 6 with an open-shaped upper end is arranged at one side of the collection tank 3, an exhaust pipe 7 is arranged between the neutralization tank 6 and the collection tank 3, one end of the exhaust pipe 7 is fixedly connected to the upper end of the liquid collecting tank 3 and communicated with the liquid collecting tank 3, a buffer solution is added into the neutralizing tank 6, and the other end of the exhaust pipe 7 extends into the buffer solution in the neutralizing tank 6.

Referring to fig. 1 and 2, the stirring mechanism 5 includes a connecting block 51 vertically rotatably disposed at an upper end in the evaporation box 21, the cross section of the connecting block 51 is circular and made of teflon, a gap is left between an upper end surface of the connecting block 51 and an inner top wall of the evaporation box 21, a driving motor 52 is disposed at a top of the evaporation box 21, an output end of the driving motor 52 is fixedly connected to the connecting block 51, two opposite outer side walls of the connecting block 51 are respectively provided with vertically disposed chutes 511, two sliders 54 are respectively slidably mounted in the chutes 511, the sliders 54 are made of teflon, two stirring rods 53 are respectively disposed on the sliders 54, the stirring rods 53 are made of teflon, one ends of the two stirring rods 53 close to the connecting block 51 are respectively hinged to the two sliders 54 and have horizontal hinge axes, one end of the stirring rod 53 far from the connecting block 51 is fixedly connected to a stirring portion 531, the stirring portion 531 is spherical, the periphery side of stirring portion 531 is laminated with the inner bottom wall of evaporation case 21 all the time, has increased the area of contact of puddler 53 and the interior experiment waste liquid of evaporation case 21 through stirring portion 531, makes puddler 53 higher to the stirring efficiency of experiment waste liquid.

Referring to fig. 2 and 3, a driving assembly 55 is disposed between the evaporation box 21 and the connection block 51, and the driving assembly 55 is used for driving the two sliders 54 to slide vertically at the same time.

The drive assembly 55 includes: screw 551, gear 552, and connector 553; the number of the screw rods 551 is two, the two screw rods 551 are vertically and rotatably installed in the two sliding grooves 511 respectively, the two sliders 54 are assembled on the two screw rods 551 in a threaded mode respectively, the upper ends of the two screw rods 551 penetrate through the sliding grooves 511 respectively and protrude out of the upper end face of the connecting block 51, and the upper ends of the two screw rods 551 are fixedly connected with the horizontally arranged gears 552 coaxially and fixedly respectively. The connecting piece 553 is arranged on the evaporation box 21, the connecting piece 553 is a gear ring 5531, two vertically arranged booms 8 are fixedly connected to the inner top wall of the evaporation box 21 at intervals, the gear ring 5531 is horizontally arranged, the lower ends of the two booms 8 are fixedly connected with the upper end face of the gear ring 5531, the gear ring 5531 is coaxially arranged with the output end of the driving motor 52, and the two gears 552 are all meshed with the gear ring 5531.

The driving motor 52 drives the connecting block 51 to rotate forward, so as to drive the two gears 552 to rotate, and since the gears 552 are meshed with the gear ring 5531, the two gears 552 can synchronously rotate, so as to drive the two screw rods 551 to rotate, and since the sliding block 54 is vertically assembled with the sliding groove 511 in a sliding manner, the sliding block 54 drives the stirring rod 53 to continuously rise along the vertical direction, so that the stirring rod 53 gradually moves from two sides of the evaporation box 21 to the center; the driving motor 52 drives the connecting block 51 to rotate reversely, so that the stirring rod 53 can gradually move to two sides from the center of the evaporation box 21, and the circulation is performed, thereby fully stirring the experimental waste liquid in the evaporation box 21.

Referring to fig. 1 and 4, the condensing mechanism 23 includes: a distilled water pipe 231 and a condensed water pipe 232; the upper end of one side of the evaporation box 21 is fixedly connected with an air duct 212, one end of the distilled water pipe 231 is communicated with one end of the air duct 212 far away from the evaporation box 21, the other end of the distilled water pipe 231 is communicated with the liquid collecting box 3, and the distilled water pipe 231 is obliquely arranged and obliquely arranged downwards from one side of the evaporation box 21 to one side of the liquid collecting box 3; the condensate pipe 232 is sleeved on the distilled water pipe 231, a condensation cavity 233 is formed between the outer peripheral wall of the distilled water pipe 231 and the inner peripheral wall of the condensate pipe 232, the distilled water pipe 231 located in the condensation cavity 233 is spirally arranged, two ends of the condensate pipe 232 are fixedly connected with the distilled water pipe 231, the condensate pipe 232 and the distilled water pipe 231 are integrally formed, one end of the condensate pipe 232 close to the evaporation box 21 is fixedly connected with a water inlet pipe 2321 communicated with the condensation cavity 233, and one end of the condensate pipe 232 close to the liquid collecting box 3 is fixedly connected with a water outlet pipe 2322 communicated with the condensation cavity 233.

The water vapor in the evaporation tank 21 enters the distilled water pipe 231 through the air duct 212, and at this time, cold water is injected into the condensation cavity 233 through the water inlet pipe 2321, so that the water vapor in the distilled water pipe 231 is condensed and liquefied and then flows into the liquid collecting tank 3; cold water continuously flows into the condensation cavity 233 from the water inlet pipe 2321 and is discharged from the water outlet pipe 2322, so that the water vapor in the distilled water pipe 231 is fully condensed and liquefied, and the concentration efficiency of the experimental waste liquid is improved.

The implementation principle of laboratory waste liquid enrichment facility of the embodiment of this application is: the during operation, close valve 2111 on the drain pipe 211, waste liquid case 1 is poured into to the waste liquid that the experiment produced, experiment waste liquid suction evaporation case 21 in with waste liquid case 1 through drawing liquid pump 41, through the experiment waste liquid heating of electric heating board in to evaporation case 21, make the moisture in the experiment waste liquid become vapor, will experiment more moisture in the waste liquid isolate, vapor gets into condensing mechanism 23, condensing mechanism 23 carries out the condensation liquefaction back and derives to collecting tank 3 to vapor, thereby obtain concentrated experiment waste liquid in evaporation case 21, concentrated experiment waste liquid can discharge through drain pipe 211.

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.