CN211964227U - Automatic cleaning device for pipette and pipette - Google Patents

Abstract

The utility model relates to an experimental apparatus technical field discloses an automatic cleaning device for pipette and pipette, including wash bowl, top cap and supporting seat, the wash bowl includes inner bag, shell body and hollow chamber, is provided with baffle and lower baffle in the inner bag, goes up to be provided with the jack on the baffle, sets up jack down on the lower baffle, and the bottom of inner bag and the bottom in hollow chamber communicate each other, and the lateral part of shell body is provided with the liquid feeding pipe in the hollow chamber of intercommunication, and the top cap sets up in the top of wash bowl, and the top edge sealing connection of top cap and wash bowl is provided with the breather pipe of intercommunication inner bag on the top cap, and the exit end of breather pipe is provided with automatic evacuating device, the supporting seat sets up in the bottom of wash bowl. The utility model discloses an automatic cleaning device for pipette and pipette reasonable in design, simple structure, many pipettes of self-cleaning and pipette simultaneously, the sanitization is thoroughly and the cleaning efficiency is high.

Description

Automatic cleaning device for pipette and pipette

Technical Field

The utility model relates to an experimental apparatus technical field, more specifically relates to an automatic cleaning device for pipette and pipette.

Background

In the daily experiment work of a laboratory, a pipette and a pipette are common quantitative experiment instruments and are used for accurately transferring a certain volume of solution, the pipette is a slender glass tube with a large expansion part in the middle, a marking line is engraved at the neck of the upper tube, the pipette is a graduated glass straight tube, and the lower ends of the pipette and the pipette are in a sharp nozzle shape.

Whether the pipette and the pipette are cleaned after use is directly related to the accuracy of the experimental results of the next use. Because the two self structural feature of the two and the requirement of precision, current pipette and pipette mostly carry out manual cleaning through the aurilave when wasing, and not only the cleaning process is slow, need consume the experimenter plenty of time, and the cleaning efficiency is low, and personnel are different moreover, and the cleaning performance difference is also very big, thoroughly clean inadequately, and in addition, the manual cleaning also causes colliding with the damage of pipette and pipette easily, influences next normal use.

It is therefore necessary to provide an automatic washing device for pipettes and pipettes that solves the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model provides an automatic cleaning device for pipette and pipette, mainly used pipette and pipette that mainly used solved present laboratory use mainly adopt the aurilave to carry out manual cleaning, and not only the cleaning process is slow, inefficiency, and not enough clean thoroughly, the cleaning performance is poor and manual cleaning causes pipette and pipette to collide with damaged problem easily moreover.

For solving the technical problem, the utility model discloses the technical scheme who adopts as follows:

the automatic cleaning device for the pipette and the pipette is of a barrel structure and comprises a cleaning barrel, a top cover and a supporting seat;

the cleaning barrel comprises an inner container, an outer shell and a hollow cavity arranged between the inner container and the outer shell, wherein an upper partition plate and a lower partition plate are sequentially arranged in the inner container from top to bottom, a plurality of upper insertion holes are uniformly formed in the upper partition plate, and lower insertion holes vertically corresponding to the upper insertion holes are formed in the lower partition plate;

the bottom of the inner container is communicated with the bottom of the hollow cavity, the hollow cavity is used for storing washing liquid, the washing liquid can flow between the inner container and the hollow cavity, and after the washing is finished, the washing liquid can be stored in the hollow cavity for reuse, so that the use cost of the device is reduced, and the discharge of the washing liquid can be reduced;

a liquid feeding pipe communicated with the hollow cavity is arranged at the side part of the outer shell and used for feeding washing liquid (such as chromic acid washing liquid) into the hollow cavity;

the top cover is arranged at the top of the cleaning barrel and is in sealing connection with the top edge of the cleaning barrel, a vent pipe communicated with the inner container is arranged on the top cover, and an automatic vacuum pumping device is arranged at the outlet end of the vent pipe;

the supporting seat is arranged at the bottom of the cleaning barrel and used for supporting the cleaning barrel, so that the whole device is stably placed.

The utility model discloses a theory of operation for automatic cleaning device of pipette and pipette does: firstly, respectively penetrating the tip end of a pipette or a pipette through an upper insertion hole of an upper partition plate and a lower insertion hole of a lower partition plate, so that after the pipette or the pipette is vertically fixed, a top cover is covered on the top of a cleaning cylinder, and a closed space is formed in the inner container of the cleaning cylinder above the lower partition plate; then add lotion in the cavity, then, start automatic vacuum pumping device and carry out intermittent type circulation formula evacuation to the inner bag of wash bowl, lotion in the cavity will be circulated the inner bag of inhaling or discharge wash bowl, when evacuating, form vacuum environment in the inner bag, lotion is inhaled the inner bag, and from getting into pipette or pipette inside from the tip portion from bottom to top, when putting under the atmospheric pressure effect during the evacuation, lotion descends from the pipette to flow back to the cavity finally, circulation operation so, can carry out reciprocal washing to the pipette inside, clean thoroughly, and cleaning efficiency is high, labour saving and time saving.

Furthermore, the shape of the upper baffle is inverted cone, the bottom of the upper baffle is provided with a downcomer connected with the lower baffle, and a check valve is arranged in the downcomer, so that when the pipette and the pipette are cleaned, the inverted cone-shaped upper baffle is beneficial to intensively recycling the washing liquid overflowing from the top ends of the pipette and the pipette, and the washing liquid flows back to the bottom of the liner of the cleaning barrel through the downcomer.

Further, the lower jack bottom of baffle all corresponds and is provided with the gasket down, and the diameter of gasket is greater than the aperture of lower jack, and the gasket adopts silica gel to make, and one of them section at gasket edge and for the baffle down glue bond or hot melt adhesive welded fastening, the gasket can be relative down the baffle open or closed. Set up the aim at of gasket, if need abluent pipette and pipette quantity less, can not insert the lower jack of baffle down, thereby the gasket can paste closely down the baffle and seal the lower jack of vacant, can not influence the vacuum when the evacuation like this, can shorten the evacuation time, improves the cleaning efficiency.

Furthermore, the top cap is connected with the top of wash bowl through adjusting screw, and the top cap is provided with the sealing washer with the top junction of wash bowl, is favorable to improving the inside gas tightness of wash bowl like this, is favorable to improving evacuation efficiency.

Furthermore, the lateral part of shell body still is provided with the inlet tube of intercommunication inner bag for wash water (can adopt running water or distilled water) is added in for the inner bag, the one end that the inlet tube stretches into the inner bag is provided with the nozzle that the direction is down, adopts the lotion to wash back to pipette and pipette, closes automatic evacuating device, makes the inner bag and external atmosphere intercommunication, adds washing water in giving the inner bag through the inlet tube, wash water and spray to last baffle after nozzle distribution, can further wash pipette and pipette, also can wash remaining lotion on the last baffle.

Furthermore, a three-way switching valve is arranged at the communication position of the bottom of the inner container and the bottom of the hollow cavity, a liquid inlet of the three-way switching valve is communicated with the hollow cavity, a first outlet of the three-way switching valve is communicated with the bottom of the inner container, a second outlet of the three-way switching valve extends to the outside of the cleaning barrel, and the three-way switching valve can be a manual adjusting valve or an electromagnetic valve.

Furthermore, the upper insertion hole and the lower insertion hole are provided with holes with different apertures, and the aperture range of the upper insertion hole and the aperture range of the lower insertion hole are 2-10 mm, so that the pipette or the pipette with different specifications can be inserted conveniently, and the application range of the device is expanded.

Further, the supporting seat comprises a hoop and supporting legs, the bottom of the cleaning barrel is sleeved with the hoop, and the supporting legs are evenly distributed at the bottom of the hoop, so that the cleaning barrel is supported, and the stability of the whole device is improved.

Further, the automatic vacuum pumping device comprises an electromagnetic three-way valve, a vacuum pump and a controller;

the electromagnetic three-way valve is arranged on the vent pipe, an air suction port of the electromagnetic three-way valve is fixedly connected with the vent pipe, two outlets of the electromagnetic three-way valve comprise a vacuum pump connecting port and a vent port, the vacuum pump connecting port is communicated with an inlet of the vacuum pump, and the vent port is communicated with the outside;

the controller is arranged on the outer wall of the cleaning barrel, is respectively connected with the electromagnetic three-way valve and the vacuum pump through power signal lines and is used for controlling the switching of a valve core flow passage of the electromagnetic three-way valve and the starting and stopping of the vacuum pump.

Further, wash bowl and top cap adopt organic glass or polytetrafluoroethylene to make, preferred organic glass, and the transparency is high, easily observes the inside behavior of device, and intensity is high, and has good corrosion resisting property, easily processing, low in manufacturing cost.

Furthermore, the upper partition plate and the lower partition plate are made of polytetrafluoroethylene, and the polytetrafluoroethylene is high in strength, good in corrosion resistance, easy to machine and form and low in manufacturing cost.

Compared with the prior art, the utility model discloses technical scheme's beneficial effect is:

1. the automatic cleaning device for the pipette and the pipette has the advantages of reasonable design, simple and compact structure, concise and attractive appearance, good assembly coordination of all parts, low manufacturing cost and contribution to popularization and application;

2. the utility model has high practicability, the automatic cleaning device of the utility model can clean a plurality of pipettes and pipettes at the same time, adopts automatic circulation type cleaning, has clean and thorough cleaning effect and high cleaning efficiency;

3. the automatic cleaning device has the advantages that the use is convenient, the automatic cleaning device does not need more manual operation and continuous monitoring, time and labor are saved, the automatic circulating cleaning is carried out after the pipette and the pipette are fixed by the upper baffle and the lower baffle, and the damage to the pipette and the pipette caused by manual cleaning can be avoided;

4. the utility model discloses an automatic cleaning device washs pipette and pipette in the enclosure space, need not staff direct contact lotion, has improved the security of use, avoids the staff to be corroded, and the lotion can be circulated once more moreover and use, can reduce environmental pollution.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic view of the structure of the automatic cleaning device of the present invention;

FIG. 2 is a schematic view of the external structure of the automatic cleaning device of the present invention;

fig. 3 is a side view of the upper baffle plate of the present invention;

fig. 4 is a top view of the upper baffle plate of the present invention;

FIG. 5 is a top perspective view of the lower baffle of the present invention;

fig. 6 is a bottom perspective view of the lower baffle plate of the present invention.

In the figure: 1-cleaning cylinder, 11-inner container, 12-outer shell, 121-liquid adding pipe, 122-water inlet pipe, 1221-nozzle, 13-hollow cavity, 131-chromic acid washing liquid, 2-top cover, 21-vent pipe, 22-adjusting screw, 23-sealing ring, 3-supporting seat, 31-hoop, 32-support leg, 4-upper partition plate, 41-upper jack, 42-down pipe, 421-one-way valve, 5-lower partition plate, 51-lower jack, 52-sealing piece, 6-automatic vacuum pumping device, 61-electromagnetic three-way valve, 611-air suction port, 612-vacuum pump connecting port, 613-vent port, 62-vacuum pump, 63-controller, 7-three-way switching valve, 71-liquid inlet, 72-first outlet, 73-second outlet, 8-pipette, 9-pipette.

Detailed Description

The drawings are for illustrative purposes only and are not to be construed as limiting the patent; for better illustration of the present embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

The description of "first" and "second" referred to in the embodiments of the present invention is for descriptive purposes only and is not to be construed as indicating or implying any relative importance or implicit indication of the number of technical features indicated, whereby the features defined as "first" and "second" may explicitly or implicitly include at least one such feature.

Also, the terms "upper", "lower", "front", "rear", "inner", "outer", "lateral", "vertical", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "mounted" and "connected" and the like are to be interpreted broadly, and may be, for example, a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, or through both elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

For the purpose of clearly understanding the technical features, objects, and effects of the present invention, the detailed description of the embodiments of the present invention will be given with reference to the accompanying drawings, but the embodiments of the present invention are not limited thereto.

Example (b):

as shown in fig. 1 to 6, an automatic cleaning device for pipettes and pipettes is a barrel structure including a cleaning barrel 1, a top cover 2 and a support base 3;

the cleaning barrel 1 comprises an inner container 11, an outer shell 12 and a hollow cavity 13 arranged between the inner container 11 and the outer shell 12, an upper partition plate 4 and a lower partition plate 5 are sequentially arranged in the inner container 11 from top to bottom, a plurality of upper insertion holes 41 are uniformly formed in the upper partition plate 4, lower insertion holes 51 which correspond to the upper insertion holes 41 in a vertical mode are formed in the lower partition plate 5, and in order to ensure that a pipette 8 and a pipette 9 are stably installed on the upper partition plate 4 and the lower partition plate 5, silica gel lining rings can be arranged on the inner sides of the upper insertion holes 41 and the lower insertion holes 51 respectively, so that the outer walls of the pipette 8 and the pipette 9 can be tightly attached to the inner walls of the upper insertion holes 41 and the lower insertion holes 51;

the bottom of the inner container 11 is communicated with the bottom of the hollow cavity 13, the hollow cavity 13 is used for storing chromic acid washing liquid 131, the chromic acid washing liquid 131 can flow between the inner container 11 and the hollow cavity 13, and after washing is finished, the chromic acid washing liquid 131 can be stored in the hollow cavity 13 for reuse, and because chromic acid is not easy to degrade, the environmental pollution can be reduced by recycling the chromic acid washing liquid 13, and the use cost of the device is also reduced;

a liquid feeding pipe 121 communicated with the hollow cavity 13 is arranged at the side part of the outer shell 12 and used for feeding chromic acid washing liquid 131 into the hollow cavity 13;

the top cover 2 is arranged at the top of the cleaning barrel 1, the top cover 2 is hermetically connected with the top edge of the cleaning barrel 1, the top cover 2 is provided with a vent pipe 21 communicated with the inner container 11, and the vent pipe 21 is provided with an automatic vacuum pumping device 6;

the supporting seat 3 is arranged at the bottom of the cleaning cylinder 1 and used for supporting the cleaning cylinder 1 and ensuring that the whole device is stably placed.

The shape of the upper baffle plate 4 is inverted cone, the bottom of the upper baffle plate 4 is provided with a downcomer 42 connected with the lower baffle plate 5, and a one-way valve 421 is arranged in the downcomer 42, so that when the pipette 8 and the pipette 9 are cleaned, the inverted cone-shaped upper baffle plate 4 is beneficial to intensively recycling chromic acid washing liquid 131 overflowing from the top ends of the pipette 8 and the pipette 9 and reflows to the bottom of the inner container 11 of the cleaning barrel 1 through the downcomer 42, and the liquid can only flow downwards but not upwards due to the one-way valve 421 arranged in the downcomer 42, so that the chromic acid washing liquid 131 can only enter the pipette 8 and the pipette 9 without rising from the downcomer 42 during vacuum pumping, the vacuum pumping time is shortened, and the cleaning efficiency is improved.

The bottom of the lower insertion hole 51 of the lower partition plate 5 is correspondingly provided with a sealing sheet 52, the diameter of the sealing sheet 52 is larger than the aperture of the lower insertion hole 51, the sealing sheet 52 is made of silica gel, one section of the edge of the sealing sheet 52 and the lower partition plate 5 are welded and fixed through hot melt adhesive, and the sealing sheet 52 can be opened or closed relative to the lower partition plate 5. The sealing sheet 52 is provided to seal the empty lower insertion hole 51 by adhering to the lower partition plate 5 if the pipettes 8 and 9 to be cleaned are not inserted into the lower insertion hole 51 of the lower partition plate 5 because the number of pipettes 8 and 9 to be cleaned is small, so that the vacuum degree is not affected during vacuum pumping, the vacuum pumping time is shortened, and the cleaning efficiency is improved.

The top cap 2 is connected with the top of the cleaning barrel 1 through the adjusting screw 22, and the sealing ring is arranged at the joint of the top cap 2 and the top of the cleaning barrel 1, so that the air tightness inside the cleaning barrel 1 is improved, and the vacuumizing efficiency is improved.

The side of the outer shell 12 is further provided with a water inlet pipe 122 communicated with the inner container 11, and is used for adding tap water (or distilled water) as cleaning water into the inner container 11, one end of the water inlet pipe 122 extending into the inner container 11 is provided with a nozzle 1221 in a downward direction, after the pipette 8 and the pipette 9 are cleaned by using chromic acid cleaning solution 131, the automatic vacuum-pumping device 6 is closed, so that the inner container 11 is communicated with the outside atmosphere, the water is added into the inner container 11 through the water inlet pipe 122, and the cleaning water is distributed by the nozzle 1221 and then sprayed to the upper partition plate 4, so that the pipette 8 and the pipette 9 can be further cleaned, and the chromic acid cleaning solution 131 remained on the upper partition plate 4 can also be cleaned.

The bottom of the inner container 11 is provided with a three-way switching valve 7 at the bottom communication position with the hollow cavity 13, a liquid inlet 71 of the three-way switching valve 7 is communicated with the hollow cavity 13, a first outlet 72 of the three-way switching valve 7 is communicated with the bottom of the inner container 11, a second outlet 73 of the three-way switching valve 7 extends to the outside of the cleaning barrel 1, and the three-way switching valve 7 adopts a manual three-way plug valve.

The upper insertion hole 41 and the lower insertion hole 51 are provided with holes with different apertures, and the aperture range of the upper insertion hole 41 and the aperture range of the lower insertion hole 51 are 2-10 mm, so that pipettes and pipettes with different specifications can be inserted conveniently, and the application range of the device is expanded.

Supporting seat 3 includes hoop 31 and stabilizer blade 32, the bottom that is fixed in wash bowl 1 is established to hoop 31 cover, and stabilizer blade 32 evenly distributed is in the bottom of hoop 31 to support wash bowl 1, improve the stationarity of integrated device.

The automatic vacuum pumping device 6 includes an electromagnetic three-way valve 61, a vacuum pump 62, and a controller 63:

the electromagnetic three-way valve 61 is installed on the breather pipe 21, the air suction port 611 of the electromagnetic three-way valve 61 is communicated and fixedly connected with the breather pipe 21, two outlets of the electromagnetic three-way valve 61 comprise a vacuum pump connecting port 612 and a vent port 613, the vacuum pump connecting port 612 is communicated with an inlet of the vacuum pump 62, and the vent port 613 is communicated with the outside;

the controller 63 is disposed on the outer wall of the cleaning barrel 1, the controller 63 is connected to a power supply, and the controller 63 is respectively connected to the three-way solenoid valve 61 and the vacuum pump 62 via power supply signal lines (not shown), so that the controller 63 can control the switching of the valve core flow path of the three-way solenoid valve 61 and the start and stop of the vacuum pump 62 while supplying power to the three-way solenoid valve 61 and the vacuum pump 62.

The cleaning cylinder 1 and the top cover 2 are made of organic glass, the transparency of the organic glass is high, the internal operation condition of the device is easy to observe, the strength is high, the cleaning cylinder has good corrosion resistance, the cleaning cylinder is easy to process, and the manufacturing cost is low.

The upper partition plate 4 and the lower partition plate 5 are made of polytetrafluoroethylene, and the polytetrafluoroethylene is high in strength, good in corrosion resistance, easy to machine and form and low in manufacturing cost.

When the automatic cleaning device is used, the top cover 2 on the cleaning barrel 1 is firstly opened, the pipette 8 and the pipette 9 are vertically inserted downwards and sequentially penetrate through the upper insertion hole 41 of the upper partition plate 4 and the lower insertion hole 51 of the lower partition plate 5, the sharp mouth parts of the pipette 8 and the pipette 9 prop open the sealing sheet 52 at the bottom of the lower partition plate 5, the outer walls of the pipette 8 and the pipette 9 are tightly attached to the inner wall of the lower insertion hole 51, the upper parts and the lower parts of the pipette 8 and the pipette 9 are reliably fixed, then the top cover 2 is covered, and the top cover 2 and the cleaning barrel 1 are tightly pressed and sealed through the adjusting screw 22;

then, adjusting the three-way switching valve 7 to form a smooth flow channel between the liquid inlet 71 and the first outlet 72, so that the hollow cavity 13 is communicated with the liner 11, adding chromic acid washing liquid 131 into the hollow cavity 13 through the liquid adding pipe 121, and enabling the chromic acid washing liquid 131 to enter the liner 11;

then, the controller 63 adjusts the electromagnetic three-way valve 61 to enable the air suction port 611 and the vacuum pump connecting port 612 to form a smooth air passage, the controller 63 starts the vacuum pump 62 to vacuumize the liner 11 of the cleaning barrel 1, the chromic acid cleaning solution 131 in the hollow cavity 13 is sucked into the liner 11 and further sucked into the pipette 8 and the pipette 9 to soak and clean the pipette 8 and the pipette 9, after the vacuum is sucked for a certain time, the controller 63 switches the electromagnetic three-way valve 61 to enable the air suction port 611 and the vent 613 to form the smooth air passage, external air enters the liner 11 to destroy the vacuum degree, and the chromic acid cleaning solution 131 descends by self gravity, flows out of the pipette 8 and the pipette 9 and returns to the hollow cavity 13; the inner container 11 is circularly vacuumized and emptied by setting the switching time of the electromagnetic three-way valve 61 on the controller 63, so that the pipette 8 and the pipette 9 can be automatically and repeatedly cleaned until the inner container is cleaned;

finally, after the pipette 8 and the pipette 9 are cleaned by the chromic acid cleaning solution 131, the vacuum pump 62 is stopped, the electromagnetic three-way valve 61 is switched to the air suction port 611 to be communicated with the air discharge port 613, after the chromic acid cleaning solution 131 flows back into the hollow cavity 13, the three-way switching valve 7 is adjusted and switched to form a smooth flow channel between the first outlet 72 and the second outlet 73, cleaning water is added into the inner container 11 through the water inlet pipe 122, the cleaning water is distributed through the nozzle 1221 and then sprayed to the upper partition plate 4 and the top openings of the pipette 8 and the pipette 9, not only can the pipette 8 and the pipette 9 be further cleaned, but also the chromic acid cleaning solution 131 remained on the upper partition plate 4 can be washed, and the cleaning water is collected at the bottom of the inner container 11 and discharged to the outside of the cleaning barrel 1 through the first outlet 72 and the second outlet 73 of the three-.

In the drawings, the positional relationship is described for illustrative purposes only and is not to be construed as limiting the present patent; it is to be understood that the above-described embodiments of the present invention are merely examples provided for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. An automatic cleaning device for pipettes and pipettes is characterized by comprising a cleaning barrel, a top cover and a supporting seat;

the cleaning barrel comprises an inner container, an outer shell and a hollow cavity arranged between the inner container and the outer shell, wherein an upper partition plate and a lower partition plate are arranged in the inner container, a plurality of upper insertion holes are formed in the upper partition plate, and lower insertion holes vertically corresponding to the upper insertion holes are formed in the lower partition plate;

the bottom of the inner container is communicated with the bottom of the hollow cavity;

a liquid feeding pipe communicated with the hollow cavity is arranged on the side part of the outer shell and used for feeding lotion into the hollow cavity;

the top cover is arranged at the top of the cleaning barrel and is in sealing connection with the top edge of the cleaning barrel, a vent pipe communicated with the inner container is arranged on the top cover, and an automatic vacuum pumping device is arranged at the outlet end of the vent pipe;

the supporting seat is arranged at the bottom of the cleaning barrel.

2. The automatic cleaning device for pipettes and pipettes of claim 1, wherein the upper partition plate is shaped as an inverted cone, the bottom of the upper partition plate is provided with a downcomer connected with the lower partition plate, and a check valve is installed in the downcomer.

3. The automatic washing device for pipettes and pipettes of claim 2, wherein the bottom of the lower insertion hole of the lower partition is correspondingly provided with a sealing sheet which can be opened and closed relative to the lower partition.

4. The automatic washing device for pipettes and pipettes of claim 3, wherein the top cover is connected with the top end of the washing cylinder through an adjusting screw, and a sealing ring is arranged at the joint of the top cover and the top end of the washing cylinder.

5. The automatic washing device for pipettes and pipettes of claim 4, wherein the side portion of the outer casing is further provided with a water inlet pipe communicated with the inner container for adding washing water to the inner container.

6. The automatic washing device for pipettes and pipettes of claim 5 wherein the end of the inlet tube extending into the inner container is provided with a nozzle directed downwardly.

7. The automatic cleaning device for pipettes and pipettes of claim 6, wherein a three-way switching valve is disposed at a position where the bottom of the inner container is communicated with the bottom of the hollow cavity, a liquid inlet of the three-way switching valve is communicated with the hollow cavity, a first outlet of the three-way switching valve is communicated with the inner container, and a second outlet of the three-way switching valve extends to the outside of the cleaning barrel.

8. The automatic cleaning device for pipettes and pipettes of claim 1, wherein holes of different diameters are provided in each of the upper and lower insertion holes, and the diameters of the upper and lower insertion holes range from 2 to 10 mm.

9. The automatic cleaning device for pipettes and pipettes of claim 1, wherein the support base comprises a ferrule and support legs, the ferrule is sleeved on the bottom of the cleaning barrel, and the support legs are evenly distributed on the bottom of the ferrule.

10. The automatic cleaning device for pipettes and pipettes of any one of claims 1 to 9, wherein the automatic vacuum pumping device comprises an electromagnetic three-way valve, a vacuum pump, and a controller;

the electromagnetic three-way valve is arranged on the vent pipe, an air suction port of the electromagnetic three-way valve is fixedly connected with the vent pipe, two outlets of the electromagnetic three-way valve comprise a vacuum pump connecting port and a vent port, the vacuum pump connecting port is communicated with an inlet of the vacuum pump, and the vent port is communicated with the outside;

the controller is arranged on the outer wall of the cleaning barrel and is connected with the electromagnetic three-way valve and the vacuum pump, and the controller is used for controlling the electromagnetic three-way valve and the vacuum pump.

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