CN211513569U

CN211513569U - Diatom enrichment appearance

Info

Publication number: CN211513569U
Application number: CN201922112729.9U
Authority: CN
Inventors: 胡孙林; 陈秋平; 莫玉叶; 梁剑航
Original assignee: Guangzhou Jingying Scientific Instruments Co ltd
Current assignee: Guangzhou Jingying Scientific Instruments Co ltd
Priority date: 2019-12-01
Filing date: 2019-12-01
Publication date: 2020-09-18
Anticipated expiration: 2029-12-01

Abstract

The utility model discloses a diatom enrichment instrument, which adopts a filtrate direct-discharge vacuum pump; the filter heads are multiple and are arranged at the top of the control box at intervals in a single row along the length direction of the control box; each filter head is provided with a disposable filter cup component; the liquid inlet end of each branch pipe is communicated with one filter head, the liquid outlet end of each branch pipe is communicated to the corresponding liquid inlet end on the trunk, and each branch pipe is provided with an electromagnetic valve which is electrically connected with the circuit controller and displays the on-off state of the branch pipe on the liquid crystal screen through control; a waste liquid discharge joint communicated with the liquid outlet end of the vacuum pump is arranged on the side surface of the control box, one end of a waste liquid discharge pipe is connected with the waste liquid discharge joint, and the other end of the waste liquid discharge pipe extends into the waste liquid collecting barrel; each component is made of acid-resistant material or contains acid-resistant protective material; the vacuum pump has the advantages that the vacuum pump is directly arranged, the filter flask is omitted, the design of the single-row filter head and the large-capacity filter cup is combined, the operation steps are simplified, the automation degree and the suction filtration efficiency are higher, the structure is more compact, and the space is saved.

Description

Diatom enrichment appearance

Technical Field

The utility model relates to a forensic medicine diatom check out test set field especially relates to a diatom enrichment appearance.

Background

In the diatom test of forensic medicine, according to the requirements of the diatom test technical specification (GA/T1662-2019) approved by the national criminal technical standardization committee, the liquid obtained by microwave digestion and dilution of a corpse organ tissue sample or a water sample needs to be subjected to suction filtration, and diatom enriched on a filter membrane is detected by a scanning electron microscope or an optical microscope so as to diagnose drowning or infer the drowning place.

The existing diatom enrichment instrument or vacuum filtration instrument usually utilizes a vacuum pump to pump away air in a filtration bottle to generate negative pressure so as to improve the filtration speed, the used filtration bottle generally adopts a glass triangular flask, the top end of the triangular flask is a filtrate inlet, and the side wall of the triangular flask is provided with a vacuum pump exhaust pipe connecting port.

However, when the existing diatom enrichment apparatus or vacuum filtration apparatus carries out filtration for a long time, if the waste liquid in the filtration bottle is full, the filtration is stopped immediately, the connecting pipeline is disassembled, the waste liquid is transferred into the waste liquid barrel, and after the waste liquid in the filtration bottle is emptied, the pipeline is reconnected to continue filtration; the suction filtration process is complicated, the automation degree is low, the efficiency is low, the equipment structure is not compact enough, and the occupied space is large.

Therefore, there is still a need for improvement and development of the prior art.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a diatom enrichment appearance, its operation process is simple, and degree of automation and suction filtration are efficient, and compact structure and occupation space are few.

The technical scheme of the utility model as follows: a diatom enrichment instrument comprises a control box, a circuit controller, a liquid crystal screen, a key panel, a direct-discharge vacuum pump, a trunk, a branch pipe, an electromagnetic valve, a filter head, a disposable filter cup assembly, a waste liquid discharge pipe and a waste liquid collecting barrel; the circuit controller, the direct-exhaust vacuum pump, the trunk circuit, the branch pipe and the electromagnetic valve are all arranged in the control box; the liquid crystal screen and the key panel are both positioned on the front inclined panel of the control box; the filter heads are arranged in a plurality and are arranged at the top of the control box at intervals in a single-row mode along the length direction of the control box; each filter head is provided with one disposable filter cup component; the liquid crystal screen, the key panel and the direct-discharge vacuum pump are electrically connected with the circuit controller and are used for controlling and displaying the suction filtration state; the liquid inlet end of the vacuum pump is connected with a main liquid outlet end pipeline of the trunk circuit; the liquid inlet end of each branch pipe is communicated with one filter head, the liquid outlet end of each branch pipe is communicated to the corresponding liquid inlet end on the trunk, and each branch pipe is provided with the electromagnetic valve which is electrically connected with the circuit controller and displays the on-off state of the branch pipe on the liquid crystal screen through control; a waste liquid discharge joint communicated with the liquid outlet end of the vacuum pump is arranged on the side surface of the control box; one end of the waste liquid discharge pipe is communicated with the waste liquid discharge joint, and the other end of the waste liquid discharge pipe extends into the waste liquid collecting barrel.

The diatom enrichment apparatus, wherein: the control box, the circuit controller, the liquid crystal display, the key panel, the vacuum pump, the trunk circuit, the branch pipe, the electromagnetic valve, the filter head, the disposable filter cup component, the waste liquid discharge pipe and the waste liquid collecting barrel are all made of acid-resistant materials or contain acid-resistant protective materials.

The diatom enrichment apparatus, wherein: the vacuum pump is a direct-discharge vacuum pump, so that a filter flask is not needed, and the filtered liquid directly passes through the pump.

The diatom enrichment apparatus, wherein: the disposable filter cup component consists of a base, a porous supporting pad, a filter membrane, a filter cup and a cup cover; the bowl cover lock is in the mouth of a river department of filter bowl, the base lock is in the end opening department of filter bowl, porous supporting pad installs on the base, the filter membrane presss from both sides between the end opening department of base and filter bowl, and is located on the porous supporting pad.

The diatom enrichment apparatus, wherein: the capacity of the filter cup is not less than 400 ml.

The diatom enrichment apparatus, wherein: a circle of inner clamping edge is arranged at the upper opening of the filter cup, and a circle of outer clamping edge matched with the outer side of the inner clamping edge is arranged at the periphery of the bottom surface of the cup cover; the lower edge of the outer clamping edge is provided with a plurality of semicircular notches at intervals and is used for forming a small gap which only allows air to enter with the inner clamping edge of the filter cup.

The diatom enrichment apparatus, wherein: the bottom surface of the base is provided with a stepped counter bore cavity which is matched and sleeved on the head part of the filter head, and the center of the inner top surface of the counter bore cavity extends downwards along the axial direction to form a cylindrical core with a through hole, and the cylindrical core is used for being inserted into the upper part of the central hole of the filter head during assembly; a circle of support surface extends outwards from the lower opening of the filter cup, a circle of bayonet wall extends downwards from the edge of the support surface, and symmetrical clamping ribs are transversely arranged on the outer side surface of the bayonet wall in a protruding mode; the filter cup is characterized in that a circle of clamping groove wall extends upwards from the step surface of the step type outer side wall of the base, a circle of clamping groove wall matched with the clamping opening wall of the filter cup is formed between the clamping groove wall and the step type outer side wall, and symmetrical blocking ribs are transversely convexly arranged on the inner side surface of the clamping groove wall and used for clamping the clamping ribs on the clamping opening wall of the filter cup through rotating the filter cup during assembly so as to connect and fix the filter cup and the base.

The diatom enrichment apparatus, wherein: the top surface of the base is provided with a counter bore matched with the porous supporting pad, and the counter bore is communicated with the through hole in the cylindrical core through the stepped taper hole.

The diatom enrichment apparatus, wherein: the outer side wall of the upper part of the filter head is also provided with a circle of sealing ring grooves for placing O-shaped sealing rings; the lateral wall on filter head upper portion is provided with the convex limit platform of round, the sealing washer recess is located the top of limit platform.

The diatom enrichment apparatus, wherein: the membrane extraction device is characterized in that a plurality of membrane extraction notches are arranged on the periphery of the top surface of the base at intervals and are located right below the edge of the filter membrane.

The diatom enrichment apparatus, wherein: the liquid crystal screen is a liquid crystal touch screen and is used for controlling the pumping filtration operation process in a mode of touching the screen.

The diatom enrichment apparatus, wherein: the circuit controller is internally provided with a timing module and an alarm module and is used for setting the pumping filtration time through a key panel and realizing the sound and light alarm function through a liquid crystal screen or a light emitting diode and a buzzer after the pumping filtration time is reached.

Aiming at the characteristic that the sample to be filtered is strong in acidity in the forensic diatom inspection, each part of the diatom enrichment instrument provided by the utility model is made of acid-resistant material or contains acid-resistant protective material; the vacuum pump has the advantages that the vacuum pump is directly arranged, the filter flask is omitted, the design of the single-row filter head and the large-capacity filter cup is combined, the operation steps are simplified, the automation degree and the suction filtration efficiency are higher, the structure is more compact, and the space is saved.

Drawings

FIG. 1 is a perspective view of the diatom enrichment apparatus of the present invention;

FIG. 2 is a perspective view of the internal structure of an embodiment of the diatom enrichment device (with the control box and the disposable bowl assembly removed);

FIG. 3 is a front view of the diatom enrichment apparatus of the present invention;

FIG. 4 is an enlarged exploded view of the disposable filter bowl assembly of the diatom enrichment device of the present invention;

figure 5 is an enlarged view of the disposable bowl assembly and filter head of the diatom enrichment apparatus of the present invention in partial longitudinal cross-section.

Detailed Description

The following detailed description and examples of the present invention are provided in connection with the accompanying drawings, which are set forth for the purpose of illustration only and are not intended to limit the invention.

As shown in fig. 1, fig. 1 is a perspective view of the diatom enrichment apparatus of the present invention, which comprises a control box 110, a liquid crystal screen 120, a key panel 130, a filter head 140 and a disposable filter cup assembly 200; the liquid crystal screen 120 and the key panel 130 are both positioned on the front inclined panel of the control box 110; the filter heads 140 are provided with a plurality of filter heads, such as 3, 4, 5, 6, 7, 8, 9, etc., the embodiment shown in fig. 1 only shows the diatom enrichment device with 6 filter heads 140, and all the filter heads 140 are arranged at the top of the control box 110 at intervals in a row or a single row along the length direction of the control box 110; a disposable bowl assembly 200 can be mounted on each filter head 140; when adding sample solution to each disposable filter cup assembly 200, the single row design can be non-interfering, and the sample addition process is more convenient and rapid.

Referring to fig. 2, fig. 2 is a perspective view of the internal structure of the embodiment of the diatom enrichment apparatus of the present invention (with the control box and the disposable filter cup assembly removed), wherein a circuit controller 150, an inline vacuum pump 160 and a main circuit 170 are disposed inside the control box 110 of fig. 1; the circuit controller 150 is electrically connected to the key panel 130 and the lcd 120 shown in fig. 1, and is configured to control the pumping filtration operation process; the direct-exhaust vacuum pump 160 is electrically connected with the circuit controller 150, and controls and displays the suction filtration state through the key panel 130 and the liquid crystal screen 120 in fig. 1, a liquid inlet end (not shown) of the direct-exhaust vacuum pump 160 is connected with a main liquid outlet end 171 of the trunk 170 through a pipeline (not shown), and some of the trunk 170 is provided with another spare main liquid outlet end 172; meanwhile, the trunk 170 is provided with a plurality of liquid inlet ends 173 having the same number as the filter heads 140, each liquid inlet end 173 is communicated with the liquid outlet end 141 of the corresponding filter head 140 through a branch pipe 180, each branch pipe 180 is provided with an electromagnetic valve 190 for controlling the on-off of the branch pipe 180, the electromagnetic valve 190 is electrically connected with the circuit controller 150, and the on-off state of the branch pipe 180 is controlled and displayed through the key panel 130 and the liquid crystal display 120 shown in fig. 1.

Referring to fig. 3, fig. 3 is a complete front view of an embodiment of the diatom enrichment apparatus of the present invention, a waste liquid discharge joint 111 connected to the liquid outlet 162 of the inline vacuum pump 160 of fig. 2 is disposed on a side of the control box 110, the waste liquid discharge joint 111 is connected to one end of a waste liquid discharge pipe 310, and the other end of the waste liquid discharge pipe 310 is connected to the waste liquid collecting barrel 300.

Preferably, a timing module (not shown) and an alarm module (not shown) are arranged in the circuit controller 150, and are used for setting the pumping time through the key panel 130 of fig. 1, and implementing an audible and visual alarm function through the liquid crystal display 120 or the light emitting diode and the buzzer of fig. 1 after the pumping time is reached, so that no personnel is required to watch the pumping process for a long time.

Preferably, the direct-discharge vacuum pump 160 is an oil-free, low-noise, and low-vibration direct-discharge pump, and the working noise during load suction filtration is preferably less than or equal to 60dB (A), so that the working environment of the operator is quieter and more comfortable.

Preferably, the liquid crystal screen 120 can be a liquid crystal touch screen, and has a function of controlling the pumping filtration operation process as the key panel 130; in addition to the key control method on the key panel 130, there is also a touch control method of a liquid crystal touch screen, and thus the operation is also simpler and more intuitive.

In the preferred embodiment of the diatom enrichment device of the present invention, as shown in fig. 4, fig. 4 is an exploded and enlarged view of the disposable filter bowl assembly used in the diatom enrichment device of the present invention, and the disposable filter bowl assembly 200 is composed of a base 250, a porous supporting pad 240, a filter membrane 230, a filter bowl 220 and a cup cover 210; the cap 210 is fastened at the upper opening of the filter bowl 220, the base 250 is fastened at the lower opening of the filter bowl 220, the porous support pad 240 is installed on the base 250, and the filter membrane 230 is clamped between the base 250 and the lower opening of the filter bowl 220 and is located on the porous support pad 240.

In order to avoid cross contamination in the diatom inspection process, the diatom enrichment instrument adopts a disposable filter cup component 200, and as the maximum capacity of a filter cup of the disposable filter cup component in the prior art is only 250ml and is small, repeated sample adding and water adding dilution are needed, the operation process is complicated, and personnel are needed to watch during the suction filtration period; preferably, the utility model discloses the used disposable filter bowl subassembly 200's of diatom enrichment appearance filter bowl 220 is the large capacity filter bowl, and its capacity is not less than 400ml, for example 500ml, from this only need the application of sample can, need not to relapse the multiple application of sample and add water dilution, and operation process is simple, and also need not personnel on duty during the suction filtration.

A circle of inner clamping edge 221 is arranged at the upper opening of the filter cup 220, and a circle of outer clamping edge 211 matched with the outer side of the inner clamping edge 221 is arranged at the periphery of the bottom surface of the cup cover 210; preferably, the lower edge of the outer clamping edge 211 is provided with a plurality of semicircular notches 212 at intervals for forming a micro gap which can only allow air to enter with the inner clamping edge 211 of the filter bowl 220, so that the long-time suction filtration effect and efficiency are not influenced, and pollutants such as particles suspended in the air can be prevented from entering the filter bowl 220 and being sucked onto the filter membrane 230 to cause pollution of the filter membrane 230 and interfere with diatom detection.

Referring to fig. 5, fig. 5 is an enlarged view of a part of a longitudinal cross-section of the disposable filter bowl assembly and the filter head used in the diatom enrichment apparatus of the present invention, the bottom surface of the base 250 is provided with a stepped counterbore cavity 251 adapted to be fitted on the head of the filter head 140, and the center of the inner top surface of the counterbore cavity 251 extends downwards along the axial direction thereof to form a cylindrical core 252 with a through hole 253 for being inserted into the upper part of the central hole 142 of the filter head 140 during assembly; a circle of support surface 223 extends outwards from the lower opening of the filter cup 220, a circle of bayonet wall 224 extends downwards from the edge of the support surface 223, and symmetrical clamping ribs 225 are transversely arranged on the outer side surface of the bayonet wall 224 in a protruding manner; a circle of clamping groove walls 254 extend upwards from the step surface of the step-type outer side wall of the base 250, a circle of clamping grooves 256 which are matched with the clamping walls 224 of the filter cup 220 and are inserted into are formed between the clamping groove walls and the step-type outer side wall of the base 250, and symmetrical blocking ribs 255 are transversely convexly arranged on the inner side surface of the clamping groove walls 254 and used for clamping the clamping ribs 225 on the clamping walls 224 of the filter cup 220 through rotation during assembly so as to connect and fix the filter cup 220 and the base 250.

Specifically, a counter bore 257 adapted to be placed in the porous support pad 240 is arranged on the top surface of the base 250, and the counter bore 257 is communicated with the through hole 253 inside the cylindrical core 252 through a stepped taper hole 258; preferably, the porous supporting pad 240 is in the shape of a circular disc, and a plurality of small holes communicating the upper end surface with the lower end surface are densely distributed on the end surface; the filter membrane 230 is circular and is assembled to be sandwiched between the support surface 223 at the lower opening of the bowl 220 and the top surface of the base 250 and supported on the porous support pad 240.

Preferably, the outer side wall of the upper part of the filter head 140 is provided with a ring of convex side platforms 144 to increase the gravity range of the filter bowl 220 installed above the filter head 140 for further preventing the filter bowl 220 from toppling; the outer side wall of the upper part of the filter head 140 is further provided with a ring of sealing ring groove for placing at least one O-ring 143 to further seal the upper port of the central hole 142 of the filter head 140, and the sealing ring groove is positioned above the side table 144.

And after suction filtration, the filter membrane is taken out, and then the diatom detection is carried out on the filter membrane by using a scanning electron microscope or an optical microscope, wherein the taken-out membrane is required to be flat, otherwise, the detection is influenced. Because the filter membrane is tightly attached to the porous support pad 240, the filter membrane 230 is conveniently taken and placed by using tools such as tweezers, and the like, so that the filter membrane 230 is prevented from being folded or damaged, preferably, a plurality of membrane taking notches 259 are further arranged at intervals on the periphery of the top surface of the stepped outer side wall of the base 250 in fig. 4, and the membrane taking notches 259 are positioned right below the edge of the filter membrane 230 and used for clamping the edge of the filter membrane 230 by using tools such as tweezers, and placing the edge on the top surface of the base 250 or taking the edge out of the top surface of the base 250 before and after suction.

The utility model discloses the theory of operation of diatom enrichment appearance is: starting the direct-exhaust vacuum pump 160, wherein the main path 170 communicated with the direct-exhaust vacuum pump 160 is in a vacuum state because the air in the main path is pumped away; the electromagnetic valve 190 on the branch pipe 180 communicated with the main road 170 is opened through the circuit control device 150, and at the moment, the branch pipe 180 is communicated with the main road 170 and is in a vacuum state; each bypass pipe 180 is in communication with the corresponding filter head 140, so that the sample liquid loaded in the disposable bowl assembly 200 on the filter head 140 enters the bypass pipe 180 through the filter membrane 230 and the porous support pad 240 under the vacuum action, then enters the dry circuit 170, and finally enters the waste liquid collecting barrel 300 through the inline vacuum pump 160 and the waste liquid discharging pipe 310 under the action of the inline vacuum pump 160, wherein diatoms and other suspended particles are trapped and concentrated on the filter membrane 230.

The utility model discloses the operation process of diatom enrichment appearance is: an operator can install a plurality of disposable bowl assemblies 200 on the corresponding filter heads 140 as desired and tighten them; taking off the cup cover 210 of a certain disposable filter cup assembly 200, firstly pouring about 400ml of pure water or ultrapure water into the filter cup 220, then adding about 100ml of sample liquid (namely the visceral organ tissue sample or the liquid obtained by microwave digestion and dilution of the water sample), and then covering the cup cover 210; starting a power supply of the device, setting suction filtration time (for example, 30min), controlling the electromagnetic valves 190 corresponding to the plurality of filter heads 140 through the liquid crystal touch screen or the key panel 130 to realize simultaneous suction filtration or single suction filtration of the plurality of filter heads 140, and allowing filtrate after suction filtration to enter the waste liquid collecting barrel 300 through the waste liquid discharge pipe 310; after the suction filtration time is reached, the equipment sends out an alarm prompt, at the moment, an operator observes whether the suction filtration of the sample mixed liquid in the filter cup 220 is finished or not, and if the sample mixed liquid still remains, the suction filtration is continued; in the whole suction filtration process, an operator can stop or terminate the suction filtration process at any time through the liquid crystal touch screen or the key panel 130; after the sample mixed liquid in the filter bowl 220 is filtered, adding 50ml of pure water or ultrapure water into the filter bowl 220 for continuous filtration so as to enable the pH value of the filter membrane 230 to be close to neutral; then, the suction filtration process is finished, the operator takes down the cup cover 210 and the filter cup 220, clamps the edge of the filter membrane 230 from a certain membrane taking notch 259 at the edge of the base 250 by using tweezers, uncovers and takes out the filter membrane 230 from the porous support pad 240, and flatly sticks the filter membrane on a sample seat or a slide of a scanning mirror for the inspection of a scanning electron microscope or an optical microscope; finally, the power supply of the equipment is turned off, and the waste liquid collecting barrel 300 is cleaned.

From this, compare with the diatom enrichment appearance among the prior art, the utility model discloses a suction flask has been given up to the inline vacuum pump, combines the design of single-row formula filter head and large capacity filter bowl, has simplified operating procedure, and degree of automation and suction filtration efficiency are higher, and the structure is compacter, more saves space.

It should be understood that the above-mentioned embodiments are only preferred embodiments of the present invention, and are not intended to limit the technical solutions of the present invention, and those skilled in the art can add, subtract, replace, change or modify the above-mentioned embodiments within the spirit and principle of the present invention, and all such additions, substitutions, changes or modifications should fall within the scope of the appended claims.

Claims

1. A diatom enrichment instrument is characterized by comprising a control box, a circuit controller, a liquid crystal screen, a key panel, a direct-discharge vacuum pump, a trunk, a branch pipe, an electromagnetic valve, a filter head, a disposable filter cup assembly, a waste liquid discharge pipe and a waste liquid collecting barrel; the circuit controller, the direct-exhaust vacuum pump, the trunk circuit, the branch pipe and the electromagnetic valve are all arranged in the control box; the liquid crystal screen and the key panel are both positioned on the front inclined panel of the control box; the filter heads are arranged in a plurality and are arranged at the top of the control box at intervals in a single-row mode along the length direction of the control box; each filter head is provided with one disposable filter cup component; the liquid crystal screen, the key panel and the direct-discharge vacuum pump are electrically connected with the circuit controller and are used for controlling and displaying the suction filtration state; the liquid inlet end of the vacuum pump is connected with the total liquid outlet end pipeline of the trunk circuit; the liquid inlet end of each branch pipe is communicated with one filter head, the liquid outlet end of each branch pipe is communicated to the corresponding liquid inlet end on the trunk, and each branch pipe is provided with the electromagnetic valve which is electrically connected with the circuit controller and displays the on-off state of the branch pipe on the liquid crystal screen through control; a waste liquid discharge joint communicated with the liquid outlet end of the vacuum pump is arranged on the side surface of the control box; one end of the waste liquid discharge pipe is communicated with the waste liquid discharge joint, and the other end of the waste liquid discharge pipe extends into the waste liquid collecting barrel.

2. The diatom enrichment apparatus of claim 1, wherein: the disposable filter cup component consists of a base, a porous supporting pad, a filter membrane, a filter cup and a cup cover; the bowl cover lock is in the mouth of a river department of filter bowl, the base lock is in the end opening department of filter bowl, porous supporting pad installs on the base, the filter membrane presss from both sides between the end opening department of base and filter bowl, and is located on the porous supporting pad.

3. The diatom enrichment apparatus of claim 2, wherein: the capacity of the filter cup is not less than 400 ml.

4. The diatom enrichment apparatus of claim 2, wherein: a circle of inner clamping edge is arranged at the upper opening of the filter cup, and a circle of outer clamping edge matched with the outer side of the inner clamping edge is arranged at the periphery of the bottom surface of the cup cover; the lower edge of the outer clamping edge is provided with a plurality of semicircular notches at intervals and is used for forming a small gap which only allows air to enter with the inner clamping edge of the filter cup.

5. The diatom enrichment apparatus of claim 2, wherein: the bottom surface of the base is provided with a stepped counter bore cavity which is matched and sleeved on the head part of the filter head, and the center of the inner top surface of the counter bore cavity extends downwards along the axial direction to form a cylindrical core with a through hole, and the cylindrical core is used for being inserted into the upper part of the central hole of the filter head during assembly; a circle of support surface extends outwards from the lower opening of the filter cup, a circle of bayonet wall extends downwards from the edge of the support surface, and symmetrical clamping ribs are transversely arranged on the outer side surface of the bayonet wall in a protruding mode; the filter cup is characterized in that a circle of clamping groove wall extends upwards from the step surface of the step type outer side wall of the base, a circle of clamping groove wall matched with the clamping opening wall of the filter cup is formed between the clamping groove wall and the step type outer side wall, and symmetrical blocking ribs are transversely convexly arranged on the inner side surface of the clamping groove wall and used for clamping the clamping ribs on the clamping opening wall of the filter cup through rotating the filter cup during assembly so as to connect and fix the filter cup and the base.

6. The diatom enrichment apparatus of claim 2, wherein: the membrane extraction device is characterized in that a plurality of membrane extraction notches are arranged on the periphery of the top surface of the base at intervals and are located right below the edge of the filter membrane.

7. The diatom enrichment apparatus of claim 1, wherein: the liquid crystal screen is a liquid crystal touch screen and is used for controlling the pumping filtration operation process in a mode of touching the screen.

8. The diatom enrichment apparatus of claim 1, wherein: the circuit controller is internally provided with a timing module and an alarm module and is used for setting the pumping filtration time through a key panel and realizing the sound and light alarm function through a liquid crystal screen or a light emitting diode and a buzzer after the pumping filtration time is reached.