CN115287770A - Para-aramid spinning solution filter - Google Patents
Para-aramid spinning solution filter Download PDFInfo
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- CN115287770A CN115287770A CN202210672504.2A CN202210672504A CN115287770A CN 115287770 A CN115287770 A CN 115287770A CN 202210672504 A CN202210672504 A CN 202210672504A CN 115287770 A CN115287770 A CN 115287770A
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- filter
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- dope
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D1/00—Treatment of filament-forming or like material
- D01D1/10—Filtering or de-aerating the spinning solution or melt
- D01D1/106—Filtering
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D1/00—Treatment of filament-forming or like material
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- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
Abstract
The invention provides a para-aramid spinning solution filter, which structurally comprises: the device comprises a stock solution inlet device, a plurality of stock solution inlet branch pipelines communicated with the stock solution inlet device, a plurality of filtering assemblies connected with the stock solution inlet branch pipelines, a filtering assembly inlet three-way valve arranged in front of the filtering assemblies, and pressure detection devices arranged at the inlets and the outlets of the filtering assemblies, wherein the outlets of the filtering assemblies are communicated with the stock solution outlet device through filtering stock solution outlet pipelines, and the filtering assemblies are connected in parallel. The invention can detect the working condition of the filtering component in real time by arranging the pressure detection device at the inlet and the outlet of the filtering component, can judge that the filtering component is abnormal when the pressure difference of a specific filtering component is detected, and can realize the interruption of the circulation of stock solution on the component by closing the valves in front of and behind the filtering component, thereby replacing or maintaining the filtering component without influencing the normal operation of other filtering components.
Description
Technical Field
The invention belongs to the technical field of para-aramid fiber preparation, relates to a liquid crystal solution filter, and particularly relates to a para-aramid spinning stock solution filter.
Background
The para-aramid fiber has the characteristics of light weight, no corrosiveness, radiation resistance, good thermal stability, high modulus, high strength and the like, and is widely applied to the fields of building materials, medical treatment, special protection, aerospace, composite materials, military industry and the like. The para-aramid fiber is mainly formed by the working procedures of dissolving poly-p-phenylene terephthamide (PPTA) and concentrated sulfuric acid, defoaming, filtering, spinning, washing, drying and the like.
Before spinning the para-aramid fiber, a filter is adopted to filter out impurities or gel particles in the melt or the slurry. Para-aramid spinning dope adopts concentrated sulfuric acid to dissolve PPTA as the solvent, and PPTA and sulfuric acid dissolve insufficient dope can the caking, in case the thick liquid caking, often blocks up the thick liquid pipeline to influence production, probably influence the life of equipment even, consequently will use the filter to filter PPTA and sulfuric acid dissolve insufficient dope, also filter the dope piece of great granule simultaneously, guarantee that the dope is clean, no granule, can not block up the spinneret.
The problem that the filter that discloses at present exists is when crossing filter core jam or trouble, can't in time discover, in time discover after filtering the trouble, also can't fix a position trouble filter core fast, lead to behind the filter trouble, must shut down the maintenance, cause unable normal production, influence enterprise's whole operational benefits.
For example, chinese patent document "a solution filter convenient to clean" (CN 213610170U) discloses a solution filter, which is simply provided with a filter screen for filtering, and after equipment failure, the whole production system cannot operate normally.
"a slurry filter for spinning aramid 1414 fibers" (CN 202323126U) discloses a solution filter, one filter cartridge being independently cleanable or ready to use while the other filter cartridge is in operation. The switching valve can conveniently switch one working cavity to another standby cavity so as to continuously work. But the device can't be used for a large amount of para-aramid stostes to filter to can't in time judge the filter trouble, and when a cartridge filter trouble, only have another cartridge filter to carry out filtering operation and must can't satisfy normal production demand, and the spinning stoste belongs to the liquid crystal state, and it is great to strain a section of thick bamboo volume, has the dead angle, can't effectively clear up all filtrating in time fast, and the clearing time is longer moreover, and required personnel are more.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a para-aramid spinning solution filter, which comprises the following specific structures: the device comprises a stock solution inlet device, a plurality of stock solution inlet branch pipelines communicated with the stock solution inlet device, a plurality of filtering components connected with the stock solution inlet branch pipelines, a filtering component inlet three-way valve arranged between the filtering components and the stock solution inlet branch pipelines, a first pressure detection device arranged at the inlet of the filtering components, and a second pressure detection device arranged at the outlet of the filtering components, wherein the outlets of the filtering components are communicated with the stock solution outlet device through filtering stock solution outlet pipelines, the filtering components are connected with the filtering stock solution outlet pipelines through filtering component outlet three-way pipes, the filtering component outlet three-way valves are arranged on the filtering component outlet three-way pipes, heat-insulating interlayers are arranged on the outer sides of the stock solution inlet branch pipelines, the filtering components and the filtering stock solution outlet pipelines, temperature detection devices are arranged in the heat-insulating interlayers, and the plurality of filtering components are connected in parallel.
According to the invention, a plurality of filtering assemblies are connected in parallel, pressure detection devices are arranged at the stock solution inlet and outlet of the filtering assemblies, the working condition of the filtering assemblies can be detected in real time, when the pressure and the pressure difference of a specific filtering assembly are detected, the filtering assembly can be judged to be abnormal, and the circulation of the para-aramid spinning stock solution on the assembly can be interrupted by closing the valves in front of and behind the filtering assembly, so that the filtering assembly is replaced or maintained under the condition of not influencing the normal operation of other filtering assemblies, and the problem that the whole filter stops operating due to the damage of a filter element is avoided.
The filter assembly comprises a filter cylinder body and a filter element arranged inside the filter cylinder body, a gap between the filter cylinder body and the filter element is a filter cavity, a space formed by the filter element is a solution cavity, and the filter element is arranged on a filter element seat.
The filter element seat is connected with the filter element flange through threads.
In order to improve the maintenance efficiency or replacement efficiency of the filter element, the filter element is designed to be in threaded connection with the flange, and when the filter element needs to be removed, the filter element can be rapidly removed and replaced in a rotating mode, so that the maintenance cost of the filter is further reduced.
The stock solution inlet branch pipeline, the filtering component inlet three-way valve and the filtering stock solution outlet pipeline are connected through flanges. The invention connects each pipeline or assembly in a flange connection mode, and is convenient for replacing or maintaining each independent assembly.
In order to ensure that the para-aramid spinning solution is in a molten state and prevent the para-aramid spinning solution from being solidified at low temperature or decomposed at high temperature, the temperature of the heat-insulating interlayer is 80-90 ℃, and the heat-insulating medium added in the heat-insulating interlayer is water or oil. And the normal state of the para-aramid spinning solution in the pipeline is ensured by controlling the temperature of the heat-insulating interlayer.
The temperature detection device is arranged in the heat preservation interlayer, the temperature of the heat preservation medium in the temperature interlayer is detected through the temperature detection device, and when the temperature detection device detects that the temperature of the heat preservation medium is higher or lower, the temperature of the heat preservation medium introduced into the interlayer is adjusted to be 80-90 ℃.
12 is no less than to filtering component's quantity, in order to improve the filtration efficiency of para-aramid spinning dope, filterable subassembly is not less than 12, the concrete setting of the subassembly quantity of filter is confirmed according to the whole flow and the velocity of flow that let in the dope, when reason flow is too little, pressure for preventing the filter core is too little, through closing some filtering component, make para-aramid spinning dope only filter in appointed several filtering component, thereby can prevent para-aramid spinning dope because of the unable filterable problem of pressure undersize.
The filtering component inlet three-way valve and/or the three-way valve is a plug valve. The circulation introduced into the filter is the para-aramid spinning solution, the para-aramid spinning solution is in a molten state, and the valve needs to be opened and closed frequently, so that the valve is selected to have the characteristics of good sealing performance, small fluid resistance, and quick and light opening and closing, and therefore the valve is preferably used as the valve.
The invention has the outstanding technical effects that:
1. according to the invention, a plurality of filtering assemblies are connected in parallel, the working conditions of the filtering assemblies can be detected in real time by arranging the pressure detection devices at the stock solution inlet and the outlet of the filtering assemblies, the using condition of the filter element is judged by pressure difference, when the pressure and the pressure difference of a specific filtering assembly are detected, the filtering assembly can be judged to be abnormal, and the circulation of the para-aramid spinning stock solution on the assembly can be interrupted by closing the valves in front of the filtering assembly and behind the filtering assembly, so that the filtering assembly is replaced or maintained under the condition of not influencing the normal operation of other filtering assemblies, and the problem that the whole filter stops operating due to the damage of the filtering core is avoided.
2. In order to improve the maintenance efficiency or replacement efficiency of the filter element, the filter element is designed to be in threaded connection with the flange, and when the filter element needs to be removed, the filter element can be rapidly removed and replaced in a rotating mode, so that the maintenance cost of the filter is further reduced. The traditional cylinder filter needs 3-5 persons for finishing work within 1 hour at least, and the whole filter is heavy, while the filter of the invention is adopted firstly, and the process of replacing the filter element to be normally used can be finished within 2 persons and a half hour, and the normal use of other filter components is not influenced.
3. In order to ensure that the para-aramid spinning solution is in a molten state and prevent the para-aramid spinning solution from being solidified at low temperature or decomposed at high temperature, the invention is provided with the heat-insulating interlayer, the temperature of the heat-insulating interlayer is controlled to be 80-90 ℃, the para-aramid spinning solution is prevented from being solidified at low temperature or decomposed at high temperature through the temperature control of the heat-insulating interlayer, and the normal state of the para-aramid spinning solution in a pipeline is ensured.
4. After the conventional filter fails, the filter element needs to be replaced integrally. The larger the amount of the spinning production body is, the longer the time needing to be recovered is, the spinning solution belongs to liquid crystal solution, the filter element is replaced in a bin cutting mode, the crusting is generated in the filter due to the long replacement time, dead materials are formed in the cavity, the service life of the filter element is influenced, or a spinneret plate is blocked, and the subsequent production is influenced. The filter is designed to be more than 12 filter assemblies which are connected in parallel, the filter element is connected with the cylinder of the filter assemblies through threads, each filter assembly is provided with the three-way pipe and the three-way valve, and all the components are connected through a flange connection mode, so that the filter assemblies or the filter elements can be quickly replaced.
Drawings
FIG. 1 is an isometric view of a para-aramid dope filter of the present invention;
FIG. 2 is a front view of a para-aramid dope filter of the present invention;
FIG. 3 isbase:Sub>A cross-sectional view taken along plane A-A of FIG. 2;
fig. 4 is an enlarged view of the region B in fig. 3.
In the figure: 1. the device comprises a raw liquid inlet device, 2 a raw liquid inlet branch pipeline, 3 a filtering assembly, 4 a filtering assembly inlet three-way valve, 5 a first pressure detection device, 6 a second pressure detection device, 7 a filtering raw liquid outlet pipeline, 8 a raw liquid outlet device, 9 a filtering assembly inlet three-way pipe, 10 a filtering assembly outlet three-way pipe, 11 a filtering assembly outlet three-way valve, 12 a heat insulation interlayer, 13 a temperature detection device, 31 a filtering cylinder, 32 a filtering core, 33 a filtering cavity, 34 a solvent cavity, 35 a filtering core seat, 36 a cylinder flange and 37 a filtering core flange.
Detailed Description
The para-aramid spinning stock solution filter provided by the invention is used for filtering para-aramid spinning stock solution.
The invention specifically comprises the following steps:
fig. 1 is a perspective view of one embodiment of the para-aramid dope filter of the present invention, fig. 1 is a front view,
the structure of the para-aramid dope filter as illustrated in fig. 1 and 2 includes: the device comprises a raw liquid inlet device 1, a plurality of raw liquid inlet branch pipelines 2 communicated with the raw liquid inlet device 1, a plurality of filtering components 3 connected with the raw liquid inlet branch pipelines, a filtering component inlet three-way valve 4 arranged between the filtering components 3 and the raw liquid inlet branch pipelines 2, a first pressure detection device 5 arranged at the inlet of the filtering components 3, a second pressure detection device 6 arranged at the outlet of the filtering components 3, a plurality of filtering component 3 outlets communicated with a raw liquid outlet device 8 through a filtering raw liquid outlet pipeline 7, the filtering components 3 and the filtering raw liquid outlet pipeline 7 are connected through a filtering component outlet three-way pipe 10, a filtering component outlet three-way valve 11 is arranged on the filtering component outlet three-way pipe 10, the plurality of filtering components 3 are in parallel connection, and 12 filtering components 3 are in parallel connection. The temperature of the heat-preservation interlayer is 80-90 ℃.
Fig. 3 isbase:Sub>A cross-sectional view ofbase:Sub>A planebase:Sub>A-base:Sub>A of the p-aramid dope filter illustrated in fig. 2, and fig. 4 is an enlarged view ofbase:Sub>A region B of fig. 3, and the p-aramid dope filter illustrated in fig. 3, wherein the filter assembly 3 includesbase:Sub>A filter cylinder 31,base:Sub>A filter element 32 disposed inside the filter cylinder 31,base:Sub>A gap between the filter cylinder 31 and the filter element 32 isbase:Sub>A filter chamber 33,base:Sub>A space formed by the filter element 32 isbase:Sub>A solvent chamber 34, and the filter element 32 is disposed onbase:Sub>A filter element holder 35. Referring to fig. 4, the filter element seat 35 and the filter element flange 37 of the present invention are connected by screw threads, and the filter element can be quickly disassembled and assembled by the screw thread connection of the filter element seat on the flange. The stock solution inlet branch pipeline 2, the filtering component 3, the filtering component inlet three-way valve 4 and the filtering stock solution outlet pipeline 7 are connected through flanges. The heat preservation medium added in the heat preservation interlayer is water or oil.
The specific working process of the para-aramid spinning solution filter is as follows: the para-aramid spinning dope filter is fed into the para-aramid spinning dope filter through a dope feeding device 1, and is respectively fed into each filtering component 3 through a plurality of dope inlet branch pipelines 2, the para-aramid dope is removed from impurities in the para-aramid dope through a filter element 32, the para-aramid dope passes through the filter element and then enters a solution cavity 34, and is converged into a dope outlet device 8 through a filtering dope outlet pipeline 7, the filtration of the spinning dope is realized, the dope is in a molten state for ensuring, the problem of low-temperature solidification or high-temperature decomposition of the dope is prevented, a temperature detection device is arranged in a heat preservation interlayer, the temperature of a heat preservation medium in the temperature interlayer is detected through the temperature detection device, when the temperature of the heat preservation medium is detected by the temperature detection device to be higher or lower, the temperature of the heat preservation medium is fed into the interlayer through fine adjustment, and the temperature of the heat preservation medium is between 80 ℃ and 90 ℃.
When one of the filter assemblies is in failure or the service life of the filter assembly reaches the end limit, the pressure of the first pressure detection device 5 arranged at the inlet of the filter assembly 3 and the pressure of the second pressure detection device 6 arranged at the outlet of the filter assembly 3 are abnormal, the pressure difference between the first pressure detection device 5 and the second pressure detection device 6 is abnormal, the filter assembly needs to be replaced or maintained, and the filter element can also be replaced or maintained.
One embodiment of the present invention is to replace the filter element, the replacement process is as follows: observing the pressure conditions of the first pressure detection device 5 and the second pressure detection device 6, closing the outlet of the abnormal filter component 3 by slowly rotating the filter component outlet three-way valve 11, closing the inlet of the abnormal filter component 3 by rotating the filter component inlet three-way valve 4, simultaneously opening the drain valve at the inlet of the abnormal filter component 3 by rotating the filter component inlet three-way valve 4, opening the drain valve at the outlet of the abnormal filter component 3 by rotating the filter component outlet three-way valve 11, discharging the para-aramid spinning stock solution in the abnormal filter component 3 from the filter component inlet three-way pipe 9, after the stock solution is completely discharged, dismounting the filter core seat 35 in threaded connection with the filter core flange 37 by dismounting the filter core flange 37 to achieve the purpose of dismounting the filter core 32, when replacing a new filter core, only needing to directly place the filter core 32 newly arranged on the filter core flange 37 on the flange 36, and then fixing the filter core flange 37 and the cylinder flange 36, mounting the new filter core 32, and the preferred implementation process can add flange gasket between the flanges, the process of replacing the filter core is very simple and convenient, and the filter core replacing process can be realized.
The new filter element is fully placed in a steam heat preservation device before replacement, so that the temperature of the filter element is between 80 and 90 ℃, and the filter element is firstly subjected to purging treatment before installation.
After the filter element 32 is replaced and installed, the stock solution is utilized to clean the filter assembly and the filter element, and the method specifically comprises the following steps:
open filter assembly entry inlet through rotary filter assembly entry three way valve 4, make counterpoint aramid fiber spinning dope enter into filter assembly, wash the filter core with counterpoint aramid fiber spinning dope earlier, then discharge behind the filter assembly export three way pipe through rotary filter assembly export three way valve 11 letting counterpoint aramid fiber spinning dope, treat the normal back of counterpoint aramid fiber spinning dope state in the filter assembly, make counterpoint aramid fiber spinning dope get into through rotary filter assembly export three way valve 11 and filter dope outlet line, finally get into the main pipeline.
Another embodiment of the present invention is a replacement filter assembly, comprising the following steps: observe the pressure condition of first pressure measurement device 5 and the 6 pressure circumstances of second pressure measurement device, export the export of unusual filter assembly 3 through slow rotatory filter assembly export three way valve 11 closure, the entry of unusual filter assembly 3 is closed to rethread rotatory filter assembly entry three way valve 4, simultaneously through rotatory filter assembly entry three way valve 4, open the flowing back valve of unusual filter assembly 3's entry, the flowing back valve of unusual filter assembly 3's export is opened to rethread rotatory filter assembly export three way valve 11, the stock solution is discharged from filter assembly entry three-way pipe 9 to the para-aramid fiber spinning stock solution in unusual filter assembly 3, after the stock solution discharges completely, dismantle filter assembly 3 through dismantling the flange at unusual filter assembly 3 both ends. New filter assembly fully stews in heat preservation device before changing, make filter assembly's temperature between 80 ℃ -90 ℃, sweep the processing to filter assembly before the installation, the process of installation filter assembly is connected filter assembly in the filter assembly position of being replaced through the flange at 3 both ends of filter assembly, filter assembly 3 replacement is installed the back, open filter assembly entry inlet through rotary filter assembly entry three way valve 4, make para-aramid spinning dope enter into filter assembly, wash the filter core with para-aramid spinning dope earlier, then let para-aramid spinning dope discharge behind filter assembly export three way pipe through rotary filter assembly export three way valve 11, treat after the normal back of para-aramid spinning dope state in the filter assembly, make para-aramid spinning dope enter into filtration dope outlet pipeline through rotary filter assembly export three way valve 11, finally get into total pipeline.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and these modifications or substitutions do not depart from the scope of the embodiments of the present invention in nature.
Claims (9)
1. The utility model provides a para-aramid spinning dope filter which characterized in that, the structure includes: the device comprises a stock solution inlet device (1), a plurality of stock solution inlet branch pipelines (2) communicated with the stock solution inlet device (1), a plurality of filter assemblies (3) connected with the stock solution inlet branch pipelines, a filter assembly inlet three-way valve (4) arranged between the filter assemblies (3) and the stock solution inlet branch pipelines (2), a first pressure detection device (5) arranged at the inlet of the filter assemblies (3), and a second pressure detection device (6) arranged at the outlet of the filter assemblies (3), wherein the outlets of the plurality of filter assemblies (3) are communicated with a stock solution outlet device (8) through a filter stock solution outlet pipeline (7), the filter assemblies (3) and the filter stock solution outlet pipeline (7) are connected through a filter assembly outlet three-way pipe (10), a filter assembly outlet three-way valve (11) is arranged on the filter assembly outlet three-way pipe (10), and the plurality of filter assemblies (3) are connected in parallel.
2. The para-aramid dope filter according to claim 1, wherein the filter assembly (3) comprises a filter cylinder (31), a filter element (32) disposed inside the filter cylinder (31), a space between the filter cylinder (31) and the filter element (32) is a filter chamber (33), a space formed by the filter element (32) is a melt chamber (34), and the filter element (32) is disposed on a filter element seat (35).
3. The para-aramid dope filter of claim 2, wherein the cartridge seat (35) is threadably connected to the cartridge flange (37).
4. The para-aramid spinning dope filter according to claim 1, wherein the dope inlet branch line (2), the filtration module (3), the filtration module inlet three-way valve (4), and the filtered dope outlet line (7) are connected by flanges.
5. The para-aramid spinning dope filter according to claim 1, wherein the outer sides of the dope inlet branch pipeline (2), the filtering assembly (3) and the filtered dope outlet pipeline (7) are provided with heat insulating interlayers (12).
6. The para-aramid dope filter of claim 5, wherein the added insulating medium in the insulating interlayer (12) is water or oil.
7. The para-aramid spinning dope filter of claim 5, wherein a temperature detection device is arranged in the heat-insulating interlayer (12).
8. The para-aramid dope filter of claim 1, wherein the number of filter modules is not less than 12.
9. The para-aramid spinning dope filter of claim 1, wherein the filter assembly inlet three-way valve (4) and/or the filter assembly outlet three-way valve (11) are plug valves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210672504.2A CN115287770A (en) | 2022-06-14 | 2022-06-14 | Para-aramid spinning solution filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202210672504.2A CN115287770A (en) | 2022-06-14 | 2022-06-14 | Para-aramid spinning solution filter |
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| CN115287770A true CN115287770A (en) | 2022-11-04 |
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| CN202210672504.2A Pending CN115287770A (en) | 2022-06-14 | 2022-06-14 | Para-aramid spinning solution filter |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1462232A (en) * | 2001-02-21 | 2003-12-17 | 恩卡技术股份有限公司 | Process and filter system for continuous filtration of liquids |
| CN203049107U (en) * | 2012-12-25 | 2013-07-10 | 杭州九隆芳纶有限公司 | On-line switching before-spinning raw liquid filter |
| CN204097605U (en) * | 2014-09-24 | 2015-01-14 | 山东英利实业有限公司 | A kind of fiber spinning dope filter |
| CN104785001A (en) * | 2015-04-10 | 2015-07-22 | 深圳市阿尔法特网络环境有限公司 | Liquid filtering device |
| CN207056074U (en) * | 2017-07-10 | 2018-03-02 | 四川普什醋酸纤维素有限责任公司 | Stoste recycle device |
| CN214344775U (en) * | 2020-11-23 | 2021-10-08 | 中环信环保有限公司 | Impurity-containing waste liquid filtering device |
| CN215742137U (en) * | 2021-05-20 | 2022-02-08 | 恒力石化（大连）炼化有限公司 | Oil refining device raw oil filter cleaning system |
-
2022
- 2022-06-14 CN CN202210672504.2A patent/CN115287770A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1462232A (en) * | 2001-02-21 | 2003-12-17 | 恩卡技术股份有限公司 | Process and filter system for continuous filtration of liquids |
| CN203049107U (en) * | 2012-12-25 | 2013-07-10 | 杭州九隆芳纶有限公司 | On-line switching before-spinning raw liquid filter |
| CN204097605U (en) * | 2014-09-24 | 2015-01-14 | 山东英利实业有限公司 | A kind of fiber spinning dope filter |
| CN104785001A (en) * | 2015-04-10 | 2015-07-22 | 深圳市阿尔法特网络环境有限公司 | Liquid filtering device |
| CN207056074U (en) * | 2017-07-10 | 2018-03-02 | 四川普什醋酸纤维素有限责任公司 | Stoste recycle device |
| CN214344775U (en) * | 2020-11-23 | 2021-10-08 | 中环信环保有限公司 | Impurity-containing waste liquid filtering device |
| CN215742137U (en) * | 2021-05-20 | 2022-02-08 | 恒力石化（大连）炼化有限公司 | Oil refining device raw oil filter cleaning system |
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