CN203874535U - Constant-volume constant-pressure automatic suction filter - Google Patents
Constant-volume constant-pressure automatic suction filter Download PDFInfo
- Publication number
- CN203874535U CN203874535U CN201420266278.9U CN201420266278U CN203874535U CN 203874535 U CN203874535 U CN 203874535U CN 201420266278 U CN201420266278 U CN 201420266278U CN 203874535 U CN203874535 U CN 203874535U
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- China
- Prior art keywords
- piston handle
- liquid storage
- piston
- guide rail
- press mold
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Abstract
The utility model discloses a constant-volume constant-pressure automatic suction filter. The constant-volume constant-pressure automatic suction filter comprises a liquid storage barrel, wherein the top end of the liquid storage barrel is provided with a liquid storage barrel cover, a piston handle is arranged vertically, the lower section of the piston handle stretches into the liquid storage barrel through the liquid storage barrel cover, a piston and a tight piston are both arranged in the liquid storage barrel, the outer sides of the piston and the tight piston are closely attached to the inner side of the liquid storage barrel, the upper section of the piston handle stretches out of the liquid storage barrel cover, a spring sheathes the upper section of the piston handle, the spring pushes against a piston handle cap upwards and pushes against the liquid storage barrel cover downwards, a piston handle guide rail is vertically arranged above the liquid storage barrel cover, the piston handle cap can slide vertically back and forth on the piston handle guide rail, a plurality of volume key holes are formed in the piston handle guide rail in different heights, a guide pipe is communicated with the bottom end of the liquid storage barrel, the lower end of the guide pipe is sequentially provided with a bearing meshed plate, a filter membrane and a pressed membrane ring, an annular bulge is arranged on the upper surface of the pressed membrane ring, an annular groove is formed in the lower surface of the bearing meshed plate, and the edge of the filter membrane is occluded and clamped by the annular groove and the annular bulge in a sealing manner. The constant-volume constant-pressure automatic suction filter has small volume, can achieve automatic suction filtration in a constant-volume constant-pressure manner, has good gas tightness, cannot leak a liquid, and has high efficiency and low cost.
Description
Technical field
The utility model relates to use for laboratory pumping and filtering device technical field, in particular at the automatic nutsch filter of a kind of constant volume level pressure of stablizing under vacuum degree condition.
Background technology
Suction filtration is filter type conventional in laboratory.Require to make not contain insoluble substance or particle in filtrate if filtered, often use filtering with microporous membrane, but near Action of Gravity Field, solution to be filtered is generally difficult to pass through fast miillpore filter.Now, need to above suction filtration liquid, increase pressure or below filter membrane, reduce pressure treating, form the pressure reduction on filter membrane two sides, thereby make solution to be filtered obtain fast filtering, this process is called press filtration or suction filtration.
In the pumping and filtering device in laboratory, conventional pumping and filtering device is the combination of Buchner funnel or sand core funnel and vavuum pump.With regard to these two kinds of pumping and filtering devices, Buchner funnel when in use filter membrane is immersed in solution to be filtered, and the leakage sepage at edge is unavoidable, and this has just affected the accuracy of experiment; And sand core funnel uses core, more difficult cleaning.In addition, these two kinds of pumping and filtering devices have large surface area, need more sample to carry out rinse.And these two kinds of pumping and filtering devices all need extra power set, i.e. vavuum pump, makes operation be subject to electric power and power limit.Another these two kinds of devices are all connected with exhaust tube, after each sample suction filtration completes, also need to load and unload air extractor while taking filtrate, then from contain liquid device, measure the sample of certain volume, and its process is loaded down with trivial details, easily impact experiment accuracy.Suction filtration and move liquid process and separate in each operating process, the many errors of easily introducing of step, operation is inconvenient.In the time using vavuum pump suction filtration, consider that pump can not no-load running, and have the unsettled phenomenon of vacuum.Operating personnel can only look after one group of pumping and filtering device, and glassware also will be handled with care, cause suction filtration efficiency lower.
Utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, provide a kind of volume little, can level pressure constant volume Automatic Extraction filtrate, well not easy-to-leak liquid sepage of air-tightness, can be positioned over the automatic nutsch filter of constant volume level pressure of auto-pumping in solution example.
The utility model is achieved through the following technical solutions:
The automatic nutsch filter of a kind of constant volume level pressure, comprise liquid storage cylinder, piston handle, piston, encrypt piston, spring, piston handle guide rail, conduit, supporting web plate, filter membrane, press mold ring and geometrical clamp, described liquid storage cylinder top is provided with a liquid storage cover, in the middle of described liquid storage cover, be provided with a circular hole, described piston handle vertically arranges and its hypomere stretches in described liquid storage cylinder by the circular hole in the middle of described liquid storage cover, described piston is arranged at the bottom of described piston handle, described encryption piston is arranged on the hypomere of described piston handle, described piston and encryption piston are all positioned at described liquid storage cylinder and setting is all close to described liquid storage cylinder inner seal in its outside, described piston handle epimere stretches out cover on described liquid storage cover and on it described spring, described piston handle top is provided with the piston handle cap that diameter is greater than described piston handle, on described spring, support piston handle cap, support down liquid storage cover, what described piston handle guide rail was vertical is located on described liquid storage cover, described piston handle cap can vertically slidably reciprocate on described piston handle guide rail, described piston handle guide rail is provided with many row's volume keyholes on differing heights, described volume keyhole is for interting volume bolt so that the extreme higher position of described piston handle cap is positioned, described liquid storage cylinder bottom arranges described conduit, and described liquid storage cylinder is communicated with described conduit, described conduit lower end sets gradually described supporting web plate, filter membrane and press mold ring, described supporting web plate and the sealing of junction, described conduit lower end, described press mold ring upper surface is provided with annular protrusion, described supporting web plate lower surface correspondence position is provided with the annular groove of the annular protrusion on press mold ring described in interlock, and the outer rim of described filter membrane is clamped by the annular protrusion sealing interlock on the annular groove on described supporting web plate and described press mold ring, on described supporting web plate, in the region taking described annular groove as boundary, be provided with multiple mesh, described press mold ring is fixed on described conduit by described geometrical clamp, described press mold ring lower end is provided with the feet stretching out downwards.
As wherein a kind of preferred embodiment of piston handle guide rail in technique scheme, described piston handle guide rail is cylindrical shape, the diameter of described piston handle cap matches with columnar piston handle guide rail internal diameter, and described piston handle cap outside can vertically slidably reciprocate on described columnar piston handle guide rail inner side.
As the another kind of preferred embodiment of piston handle guide rail in technique scheme, described piston handle guide rail comprises two pieces points of guide rails, match with the diameter of described piston handle cap in gap between described two pieces points of guide rails, described piston handle cap outside can vertically slidably reciprocate between described two pieces points of guide rails.
As the preferred embodiment of technique scheme, described in described piston arrives when the bottom position of liquid storage cylinder, described piston handle cap just arrive on piston handle guide rail, be positioned at its lowest position descend row's volume keyhole place most.
As the preferred embodiment of technique scheme, there is volume scale in described piston handle guide rail outside at the other all marks of described many row's volume keyholes.
As the preferred embodiment of technique scheme, described geometrical clamp comprises two points of geometrical clamps in left and right, and described point of geometrical clamp upper end is vertical shape and is fixed on the outside of described conduit, and it is hook-shaped and by being pressed on described press mold ring lower surface that described point of geometrical clamp lower end is.
As the preferred embodiment of technique scheme, the cross sectional shape of the annular protrusion on the annular groove on described supporting web plate and described press mold ring is circular arc.
As the preferred embodiment of technique scheme, described piston lower end is up big and down small round table-like, described liquid storage cylinder lower end be with described piston lower end match up big and down small round table-like.
As the preferred embodiment of technique scheme, described press mold ring lower end is provided with three feets that stretch out uniformly downwards.
The utility model has the following advantages compared to existing technology:
The automatic nutsch filter of a kind of constant volume level pressure that the utility model provides, thereby in use filter membrane suction filtration process, form vacuum state by compressed spring reset and realize the automatic suction filtration of suck-back, avoid using extra power set, broken away from electric power and manpower restriction, can realize batch operation.In addition, this nutsch filter filter membrane be supported annular protrusion on annular groove and the press mold ring on web plate sealing interlock, and fixedly press press mold ring by geometrical clamp and realize fixing, each assembly can be fixed fast, and press mold ring and filter membrane are all difficult for producing slide displacement, there is good air-tightness, not easy-to-leak liquid sepage.In suction filtration process, can be by selecting the spring push-pull piston handle cap of different coefficient of elasticity, and then push-and-pull piston is realized different vacuum in order to suction filtration with encryption piston, and in spring deformation range, spring can provide stable elastic force, thereby for suction filtration provides stable vacuum, there is level pressure suction filtration; Simultaneously, the position that this nutsch filter can control piston handle gos up by inserting volume bolt in the volume keyhole on the differing heights on piston handle guide rail, thereby the position that control piston gos up, reaches the object of controlling suction filtration liquid volume, has advantages of constant volume suction filtration.In addition, press piston handle to liquid storage cylinder bottom choosing behind spring and volume bolt position, install after filter membrane, the lower end of whole nutsch filter directly can be immersed in and treat in drawing liquid body, keep an eye on without manpower, can realize automatic suction filtration to settable volume, one can operate multiple simultaneously, save manpower, greatly improve suction filtration speed.After suction filtration completes, the liquid in nutsch filter directly can be released, due to set volume before, without quantitatively pipetting with liquid-transfering device again, realize suction filtration and moved having synchronizeed of liquid, simplify experimental procedure, further improve efficiency.The combination unit that the structure of this nutsch filter is connected with funnel than numerous and diverse vavuum pump is simpler, light and flexible, and cost is low, and cost performance is high, and simple to operation, time saving and energy saving, and efficiency is high, is suitable for applying on a large scale.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model.
Fig. 2 is lower end of the present utility model partial enlarged drawing.
Fig. 3 is supporting web plate upward view.
Fig. 4 is press mold ring front view.
Fig. 5 is the top view of Fig. 4.
Detailed description of the invention
Below embodiment of the present utility model is elaborated; the present embodiment is implemented under taking technical solutions of the utility model as prerequisite; provided detailed embodiment and concrete operating process, but protection domain of the present utility model is not limited to following embodiment.
Referring to Fig. 1 to Fig. 5, the automatic nutsch filter of a kind of constant volume level pressure that the utility model provides, comprise liquid storage cylinder 4, piston handle 13, piston 6, encrypt piston 5, spring 14, piston handle guide rail 1, conduit 12, supporting web plate 7, filter membrane, press mold ring 10 and geometrical clamp 11, liquid storage cylinder 4 tops are provided with a liquid storage cover 16, in the middle of liquid storage cover 16, be provided with a circular hole, piston handle 13 vertically arranges and its hypomere stretches in liquid storage cylinder 4 by the circular hole in the middle of liquid storage cover 16, piston 6 is arranged at the bottom of piston handle 13, encrypting piston 5 is arranged on the hypomere of piston handle 13, piston 6 and encryption piston 5 are all positioned at liquid storage cylinder 4 and setting is all close to liquid storage cylinder 4 inner seals in its outside, piston 6 lower ends are up big and down small round table-like, liquid storage cylinder 4 lower ends be with piston 6 lower ends match up big and down small round table-like, piston handle 13 epimeres stretch out cover on liquid storage cover 16 and on it spring 14, piston handle 13 tops are provided with the piston handle cap 15 that diameter is greater than piston handle 13, on spring 14, support piston handle cap 15, support down liquid storage cover 16, what piston handle guide rail 1 was vertical is located on liquid storage cover 16, piston handle cap 15 can vertically slidably reciprocate on piston handle guide rail 1, piston handle guide rail 1 is provided with many row's volume keyholes 2 on differing heights, there is volume scale in piston handle guide rail 1 outside at the other all marks of many row's volume keyholes 2, volume keyhole 2 is for interting volume bolt 3 so that the extreme higher position of piston handle cap 15 is positioned, by volume bolt 3 being inserted in the volume keyhole 2 of differing heights, can control the height that piston handle 13 rises, thereby control the volume of suction filtration liquid, reach the object of constant volume suction filtration.Liquid storage cylinder 4 bottoms arrange conduit 12, and liquid storage cylinder 4 is communicated with conduit 12, conduit 12 lower ends set gradually supporting web plate 7, filter membrane and press mold ring 10, supporting web plate 7 and conduit 12 junction, lower end sealings, press mold ring 10 upper surfaces are provided with annular protrusion 17, supporting web plate 7 lower surface correspondence positions are provided with the annular groove 8 of the annular protrusion 17 on interlock press mold ring 10, and the outer rim of filter membrane is supported annular protrusion 17 on annular groove 8 and the press mold ring 10 on web plate 7 and seals interlock and clamp.The cross sectional shape of the annular groove 8 on supporting web plate 7 and the annular protrusion 17 on press mold ring 10 is preferably circular arc.On supporting web plate 7, in the region taking annular groove 8 as boundary, be provided with multiple mesh 18, press mold ring 10 is fixed on conduit 12 by geometrical clamp 11, geometrical clamp 11 comprises two points of geometrical clamps 11 in left and right, point geometrical clamp 11 upper ends are vertical shape and are fixed on the outside of conduit 12, and it is hook-shaped and by being pressed on press mold ring 10 lower surfaces that point geometrical clamp 11 lower ends are.Press mold ring 10 lower ends are provided with three feets that stretch out 9 uniformly downwards.
Wherein, piston handle guide rail 1 has two kinds of structures, and the first structure is cylindrical shape, and the diameter of piston handle cap 15 matches with columnar piston handle guide rail 1 internal diameter, and piston handle cap 15 outsides can vertically slidably reciprocate on columnar piston handle guide rail 1 inner side; The second structure comprises two pieces points of guide rails, matches with the diameter of piston handle cap 15 in the gap between two pieces points of guide rails, and piston handle cap 15 outsides can vertically slidably reciprocate between two pieces points of guide rails.In this nutsch filter, spring 14 is metal material, and encrypting piston 5 and piston 6 is quality of rubber materials, and remainder is plastic material.
Before use, need first this nutsch filter to be installed.
First mounting spring 14 make piston handle 13 reach extreme lower position, its detailed process is: extract volume bolt 3, by piston handle 13 together with piston 6 and encrypt piston 5 and together extract.According to the needs of suction filtration vacuum, select the supporting spring 14 of suitable coefficient of elasticity, spring 14 is inserted in to piston handle 13 from piston handle 13 with one end of piston 6, until touch piston handle cap 15 one end.Piston handle 13 hypomeres of cover upper spring 14 are got back into liquid storage cylinder 4 again, now on spring 14, support piston handle cap 15, support down liquid storage cover 16, because spring 14 contacts with the liquid storage cover 16 of liquid storage cylinder 4 upper ends, can hinder piston handle 13 continues to fill in, now need piston handle cap 15 to press, spring 14 pressurizeds shrink, piston 6 can be filled in the bottom of liquid storage cylinder 4, piston handle 13 is pressed into after extreme lower position, piston handle cap 15 just arrive on piston handle guide rail 1, be positioned at extreme lower position descend row's volume keyhole 2 most, now descending most in row's volume keyhole 2 to insert volume bolt 3, volume bolt 3 block piston handle cap 15 and piston handle 13 on move, spring 14 is compressive state.
Then filter membrane is installed, and its detailed process is as follows: nutsch filter is inverted, is outwards moved gently in two points of geometrical clamps 11 barbed end of any one, press mold ring 10 surfaces lose pressing of point geometrical clamp 11, can easily take off press mold ring 10.After press mold ring 10 takes off, filter membrane entirely can be placed on supporting web plate 7, then will divide geometrical clamp 11 to break into two with one's hands laterally gently, put press mold ring 10, divide geometrical clamp 11 because flexible meeting automatically restores to origin-location, thereby press press mold ring 10, ensure that press mold ring 10 is pressed on supporting web plate 7.On press mold ring 10, there is annular protrusion 17, supporting on web plate 7 there being annular groove 8, on press mold ring 10, annular protrusion 17 can interlock also seal and clamp filter membrane with annular groove 8 corresponding on supporting web plate 7, can either seal and can prevent that displacement from appearring in filter membrane and press mold ring 10, prevent press mold ring 10 and slide filter membrane, make the mesh 18 on filter membrane sealing supporting web plate 7, ensure no leakage.
After this nutsch filter is installed, just suction filtration operation can be carried out.The lower end of nutsch filter is put into and filled the container for the treatment of suction filtration liquid, guarantee that part below the filter membrane of nutsch filter immerses to treat below suction filtration liquid liquid level.Now, from the volume keyhole 2 on top, extract volume bolt 3 out, the volume of suction filtration liquid is selected mark the volume keyhole 2 of corresponding volume scale and insert volume bolt 3 on piston handle guide rail 1 as required.Because filter membrane has certain filtration flux, and generally miillpore filter is under rational vacuum, and suction filtration speed is also slower.By compressed spring 14 lifting piston handles 13, but piston handle 13 only can rising, owing to encrypting piston 5 and the acting in conjunction of piston 6 and the guide effect of piston handle guide rail 1, can keep the stable rising of piston handle 13 can not tilt to cause leakage.Due to spring 14 elasticity stable, suction filtration reaches after set volume, and piston handle cap 15 is blocked by the volume bolt 3 on it, and piston handle 13 can not rise again, and suction filtration process can stop automatically.Therefore, the nutsch filter that installs filter membrane and setting and take out filtrate volume can be placed on and treat in suction filtration liquid suction filtration voluntarily, not need artificial nurse, so a people can use multiple nutsch filters simultaneously, greatly improve the operating efficiency of suction filtration.The effect of this nutsch filter lower end feet 9 is can ensure filter membrane apart from treating that there is certain altitude suction filtration liquid container bottom surface, when suction filtration, filter membrane is positioned at the top for the treatment of suction filtration liquid, filter membrane does not contact the bottom surface for the treatment of suction filtration liquid container, has avoided treating that sediment in suction filtration liquid etc. is deposited on filter membrane and then causes filter membrane shutoff or destruction; And filter membrane edge by annular protrusion 17 on press mold ring 10 and supporting on web plate 7 corresponding annular groove 8 interlocks sealings clamp, good airproof performance, can effectively avoid the leakage sepage problem at filter membrane edge, has ensured the accuracy that suction filtration is tested.Treat the complete direct taking-up nutsch filter of suction filtration, the filtrate of suction filtration is stored in liquid storage cylinder 4 and is arranged under piston 6 and conduit 12., after suction filtration completes, the liquid in nutsch filter directly can be released, owing to having set the volume of suction filtration filtrate before suction filtration, so avoided again quantitatively moving liquid, by suction filtration with move liquid and synchronizeed, simplified experimental procedure, further improved operating efficiency.The combination unit that the structure of this nutsch filter is connected with funnel than numerous and diverse vavuum pump is simpler, light and flexible, and cost is low, and cost performance is high, and simple to operation, time saving and energy saving, and efficiency is high, is suitable for applying on a large scale.
These are only preferred embodiment of the present utility model, not in order to limit the utility model, all any amendments of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection domain of the present utility model.
Claims (9)
1. the automatic nutsch filter of constant volume level pressure, it is characterized in that: comprise liquid storage cylinder, piston handle, piston, encrypt piston, spring, piston handle guide rail, conduit, supporting web plate, filter membrane, press mold ring and geometrical clamp, described liquid storage cylinder top is provided with a liquid storage cover, in the middle of described liquid storage cover, be provided with a circular hole, described piston handle vertically arranges and its hypomere stretches in described liquid storage cylinder by the circular hole in the middle of described liquid storage cover, described piston is arranged at the bottom of described piston handle, described encryption piston is arranged on the hypomere of described piston handle, described piston and encryption piston are all positioned at described liquid storage cylinder and setting is all close to described liquid storage cylinder inner seal in its outside, described piston handle epimere stretches out cover on described liquid storage cover and on it described spring, described piston handle top is provided with the piston handle cap that diameter is greater than described piston handle, on described spring, support piston handle cap, support down liquid storage cover, what described piston handle guide rail was vertical is located on described liquid storage cover, described piston handle cap can vertically slidably reciprocate on described piston handle guide rail, described piston handle guide rail is provided with many row's volume keyholes on differing heights, described volume keyhole is for interting volume bolt so that the extreme higher position of described piston handle cap is positioned, described liquid storage cylinder bottom arranges described conduit, and described liquid storage cylinder is communicated with described conduit, described conduit lower end sets gradually described supporting web plate, filter membrane and press mold ring, described supporting web plate and the sealing of junction, described conduit lower end, described press mold ring upper surface is provided with annular protrusion, described supporting web plate lower surface correspondence position is provided with the annular groove of the annular protrusion on press mold ring described in interlock, and the outer rim of described filter membrane is clamped by the annular protrusion sealing interlock on the annular groove on described supporting web plate and described press mold ring, on described supporting web plate, in the region taking described annular groove as boundary, be provided with multiple mesh, described press mold ring is fixed on described conduit by described geometrical clamp, described press mold ring lower end is provided with the feet stretching out downwards.
2. the automatic nutsch filter of a kind of constant volume level pressure as claimed in claim 1, it is characterized in that: described piston handle guide rail is cylindrical shape, the diameter of described piston handle cap matches with columnar piston handle guide rail internal diameter, and described piston handle cap outside can vertically slidably reciprocate on described columnar piston handle guide rail inner side.
3. the automatic nutsch filter of a kind of constant volume level pressure as claimed in claim 1, it is characterized in that: described piston handle guide rail comprises two pieces points of guide rails, match with the diameter of described piston handle cap in gap between described two pieces points of guide rails, described piston handle cap outside can vertically slidably reciprocate between described two pieces points of guide rails.
4. the automatic nutsch filter of a kind of constant volume level pressure as claimed in claim 1, is characterized in that: described in described piston arrives when the bottom position of liquid storage cylinder, described piston handle cap just arrive on piston handle guide rail, be positioned at its lowest position descend row's volume keyhole place most.
5. the automatic nutsch filter of a kind of constant volume level pressure as claimed in claim 1, is characterized in that: there is volume scale in described piston handle guide rail outside at the other all marks of described many row's volume keyholes.
6. the automatic nutsch filter of a kind of constant volume level pressure as claimed in claim 1, it is characterized in that: described geometrical clamp comprises two points of geometrical clamps in left and right, described point of geometrical clamp upper end is vertical shape and is fixed on the outside of described conduit, and it is hook-shaped and by being pressed on described press mold ring lower surface that described point of geometrical clamp lower end is.
7. the automatic nutsch filter of a kind of constant volume level pressure as claimed in claim 1, is characterized in that: the cross sectional shape of the annular protrusion on the annular groove on described supporting web plate and described press mold ring is circular arc.
8. the automatic nutsch filter of a kind of constant volume level pressure as claimed in claim 1, is characterized in that: described piston lower end is up big and down small round table-like, described liquid storage cylinder lower end be with described piston lower end match up big and down small round table-like.
9. the automatic nutsch filter of a kind of constant volume level pressure as claimed in claim 1, is characterized in that: described press mold ring lower end is provided with three feets that stretch out uniformly downwards.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420266278.9U CN203874535U (en) | 2014-05-22 | 2014-05-22 | Constant-volume constant-pressure automatic suction filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420266278.9U CN203874535U (en) | 2014-05-22 | 2014-05-22 | Constant-volume constant-pressure automatic suction filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203874535U true CN203874535U (en) | 2014-10-15 |
Family
ID=51675081
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420266278.9U Withdrawn - After Issue CN203874535U (en) | 2014-05-22 | 2014-05-22 | Constant-volume constant-pressure automatic suction filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203874535U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103961917A (en) * | 2014-05-22 | 2014-08-06 | 安徽理工大学 | Volume-constant pressure-constant automatic suction filter |
-
2014
- 2014-05-22 CN CN201420266278.9U patent/CN203874535U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103961917A (en) * | 2014-05-22 | 2014-08-06 | 安徽理工大学 | Volume-constant pressure-constant automatic suction filter |
| CN103961917B (en) * | 2014-05-22 | 2015-07-29 | 安徽理工大学 | The automatic nutsch filter of a kind of constant volume level pressure |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20141015 Effective date of abandoning: 20150729 |
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| RGAV | Abandon patent right to avoid regrant |