CN103089714A - Turbine type gas compressor front end dust remover and filter element thereof - Google Patents
Turbine type gas compressor front end dust remover and filter element thereof Download PDFInfo
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- CN103089714A CN103089714A CN2013100240208A CN201310024020A CN103089714A CN 103089714 A CN103089714 A CN 103089714A CN 2013100240208 A CN2013100240208 A CN 2013100240208A CN 201310024020 A CN201310024020 A CN 201310024020A CN 103089714 A CN103089714 A CN 103089714A
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Abstract
The invention discloses a turbine type gas compressor front end dust remover and a filter element of the turbine type gas compressor front end dust remover. By means of the turbine type gas compressor front end dust remover and the filter element of the turbine type gas compressor front end dust remover, the phenomenon that a turbine type gas compressor is subjected to scaling after being used for a long time can be effectively improved. The front end dust remover comprises an outer shell, the filter element mounted in the outer shell, and a back-blowing dust cleaning device which acts on the filter element. The outer shell is connected with the filter element through a pore plate and forms a first space and a second space which are separated. Transmission of gas to be filtered happens in the first space, and the transmission of filtered gas happens in the second space. The filter element is provided with a filter material which is composed of a porous high-density polyethylene support body and an expanded polytetrafluoroethylene (PTFE) filter film, wherein the expanded PTFE filter film is closely attached to the surface of the porous high-density polyethylene support body. The removal rate of dust with a grain diameter of greater than or equal to 0.5 micrometer in the gas to be filtered by the expanded PTFE filter film is more than 99%. According to the turbine type gas compressor front end dust remover and the filter element of the turbine type gas compressor front end dust remover, the filter material can maintain stable and high filter precision for a long time, and therefore the phenomenon that the turbine type gas compressor is subjected to the scaling after being used for a long time can be effectively improved.
Description
Technical field
The present invention relates to the gas filtration technical field, be specifically related to turbine gas compressor front end deduster and filter element thereof.
Background technique
Gas compressor is broadly divided into positive displacement and the large class of turbine-type two from working principle.Thereby the positive displacement gas compressor relies on mechanical motion directly to make the Volume Changes of gas reach the supercharging purpose, and it is mainly used in the occasion of middle small flow at present.The impeller that at first turbine gas compressor relies on High Rotation Speed improves the flow velocity of gas, thereby and then make high velocity air in Diffuser rapidly reduction of speed reach the supercharging purpose, it is mainly used in the occasion of large flow at present.
That existing turbine gas compressor mainly comprises is centrifugal, axial flow, diagonal flow type and combined type.Usually also be provided with the front end deduster before these turbine gas compressors.The effect of front end deduster is that the gas that is about to enter turbine gas compressor is carried out udst separation, so that the dust content in gas descends, avoids dust exceeding to cause adverse effect to the use of turbine gas compressor.
At present, turbine gas compressor front end deduster almost all adopts filter drum type precipitator or fiber bag precipitator.It is filter element that filter drum type precipitator adopts filter cylinder, and it is filter element that fiber bag precipitator adopts cloth bag.Filter cylinder is to be folded into after wrinkle bonding the one-tenths cylinder of head and the tail again by filtering material, and the inside of cylinder is supported with metal truss, tin fix with top cover and base up and down.Filtering material plays determinant factor to the synthetic filter performance of filter drum type precipitator.Fiber bag precipitator is also like this.
The subject matter of turbine gas compressor is that after long-time the use, the compressor operating vibration values raises, and the cooler heat exchanger efficiency reduces.Find through checking, the parts foulings such as the impeller in compressor, cooler fin and runner are the immediate causes that causes this problem.For this problem, most enterprises have to frequently compressor be overhauled snaking, further cause the useful working life of compressor significantly to shorten, the working service out of control of cost of compressor.
Also someone attempts improving the filtering material that filter cylinder or cloth bag use for this problem.Wherein, common way is to improve the filter precision of filtering material.To those skilled in the art, in order to improve the filter precision of filtering material, film or the direct choosing folding filter precision higher filtering material higher at surface attachment one deck filter precision of filtering material are all feasible ways.But these ways can not effectively be improved scale problems.
Summary of the invention
The present invention aims to provide a kind of turbine gas compressor that can effectively improve and uses for a long time turbine gas compressor front end deduster and the filter element thereof that scale problems occurs.
The inventor finds, causes the main cause of turbine gas compressor fouling both relevant with the filter precision of front end deduster, and is simultaneously relevant with the anti-deformation of filtering material in filter element again.The filtering material that uses due to filter cylinder and cloth bag all has larger flexibility, simultaneously, filter cylinder and cloth bag can't provide enough Area of bearing to its filtering material again, therefore, when being in, filters and lower time of working state of the frequent switching of blowback filter element, filtering material will repeated deformation finally causes the fiber fatigue failure in filtering material along with the air-flow break-in, and filter precision descends.At this moment, also reach far away its theoretical working life the service time of filter cylinder/cloth bag, and it is in appearance also without significant change, although cause the strainability of filter cylinder/cloth bag to descend and to be discovered by the user, just caused a large amount of dust to enter turbine gas compressor and then caused scale problems under continuing to use.
In view of this, turbine gas compressor front end deduster of the present invention has adopted following technological scheme: the back-blowing dust removing device that turbine gas compressor front end deduster comprises shell, is arranged on the filter element in shell and acts on filter element, described shell is connected and forms the first space and the second space of separation by orifice plate with filter element, the transmission of gas to be filtered occurs in the first space, and the transmission of filtering gas occurs in second space; Filter element has the filtering material that is made of at the expanded PTFE filtration membrane of high density porous polyethylene supporting body surface high density porous polyethylene support and close attachment; Described expanded PTFE filtration membrane is treated the eliminating rate of dust of particle diameter in filtering gas 〉=0.5 μ m more than 99%.
The present invention is based on the filtering material repeated deformation, to cause the fiber fatigue failure be the understanding of turbine gas compressor fouling root, therefore adopt the filtering material that is made of at the expanded PTFE filtration membrane of high density porous polyethylene supporting body surface high density porous polyethylene support and close attachment.Wherein, the expanded PTFE filtration membrane itself has very high filter precision (treating the eliminating rate of dust of particle diameter in filtering gas 〉=0.5 μ m more than 99%), simultaneously, the expanded PTFE filtration membrane embodies again stronger rigidity under the support of high density porous polyethylene support, therefore can be because of air-flow break-in repeated deformation in filtration and the frequent switching of blowback, therefore, filtering material of the present invention can stable for extended periods of time high filtering precision, thereby the scale formation under improving effectively that turbine gas compressor is long-time and using.
It is pointed out that the expanded PTFE filtration membrane of indication in the present invention, be a kind of by tensile buckling (i.e. the implication of " varicosity ") thus form the film of fibrous blind hole on polytetrafluoroethylmaterial material.This film itself also has extremely strong hydrophobicity and not sticking grey characteristics, therefore, all is difficult for producing dewfall and sticks with paste the film phenomenon under various weather conditions, and can realize easily the purifying regeneration of film by back-blowing dust removing device.Also will particularly point out, filtering material of the present invention can adopt first by mould-forming high density porous polyethylene support, and then prepares in the method that its surface heat covers one deck expanded PTFE filtration membrane.As long as the adhesion between high density porous polyethylene support and expanded PTFE filtration membrane is the peeling force of air-flow to the expanded PTFE filtration membrane during greater than reverse gas cleaning, namely reached in the present invention the requirement to close attachment between high density porous polyethylene support and expanded PTFE filtration membrane.
A kind of concrete structure as filter element in the above-mentioned turbine gas compressor front end of the present invention deduster, described filter element comprises the chimney filter of many end openings and the other end sealing, the opening end of these chimney filters is positioned at second space, the external tube layer that each chimney filter comprises the inner tube layer that is made of the high density porous polyethylene support and is attached on described inner tube outer surface and is made of the expanded PTFE filtration membrane.
As the improvement to said structure, but described filter element comprises at least one group of integral installation filter element in shell, every group of filter element comprises many described chimney filters, and each chimney filter in same group of filter element connects as one by the first termination link and the second termination link; Described the first termination link is arranged on described orifice plate and is provided with respectively vent with the opening end conducting of described each chimney filter.Because this improvement structure connects into one group of filter element with many chimney filters, therefore improved the convenience that filter element is installed.
As the improvement to said structure, the surface that contacts with orifice plate on described the first termination link also is provided with the annular sealing strip that surrounds simultaneously all vents.This annular sealing strip can be realized the sealing between each chimney filter and orifice plate simultaneously, has simplified sealing configuration.
As the improvement to said structure, described the second termination link is consisted of by the sealing plate that doubles as described each chimney filter closed end.Thus, can simplify the structure of filter element, be conducive to the making of filter element.
As the improvement to said structure, the hole density of described expanded PTFE filtration membrane is 5 * 10
8Individual/cm
2To 30 * 10
8Individual/cm
2Expanded PTFE filtration membrane with above-mentioned hole density can obtain comparatively desirable filtration flux during as the filtering material of existing turbine gas compressor front end deduster.
As the improvement to said structure, described expanded PTFE filtration membrane is treated the eliminating rate of dust of particle diameter in filtering gas 〉=0.1 μ m more than 99%.Thus, further improved the filter precision of expanded PTFE filtration membrane.
The filter element that is used for the above-mentioned turbine gas compressor front end of the present invention deduster, this filter element have the filtering material that is made of at the expanded PTFE filtration membrane of high density porous polyethylene supporting body surface high density porous polyethylene support and close attachment; Described expanded PTFE filtration membrane is treated the eliminating rate of dust of particle diameter in filtering gas 〉=0.5 μ m more than 99%.
As the improvement to said structure, described filter element comprises chimney filter, the external tube layer that described chimney filter comprises the inner tube layer that is made of the high density porous polyethylene support and is attached on described inner tube outer surface and is made of the expanded PTFE filtration membrane.
As the improvement to said structure, described filter element comprises filter element, and described filter element comprises many described chimney filters, and wherein each chimney filter connects as one by the first termination link and the second termination link; Described the first termination link is provided with respectively the vent with the opening end conducting of described each chimney filter.
The present invention is described further below in conjunction with the drawings and specific embodiments.The aspect that the present invention adds and advantage part in the following description provide, and part will become obviously from the following description, or recognize by practice of the present invention.
Description of drawings
Fig. 1 is the structural representation of turbine gas compressor front end deduster of the present invention.
Fig. 2 is the structural representation of filter element in turbine gas compressor front end deduster of the present invention.
Fig. 3 be in Fig. 2 A to schematic diagram.
Fig. 4 be in Fig. 2 B to schematic diagram.
Fig. 5 is the partial enlarged drawing at C place in Fig. 3.
Fig. 6 is the cross section micrograph of the filtering material that uses of the specific embodiment of the invention.
Fig. 7 is expanded PTFE filtration membrane surface micrograph in the filtering material that uses of the specific embodiment of the invention.
Embodiment
as shown in Fig. 1 to 5, be provided with the front end deduster before turbine gas compressor 8, this front end deduster comprises shell 3, the back-blowing dust removing device 1 that is arranged on the filter element 4 on shell 3 and acts on filter element 4, described shell 3 is connected and forms the first space and the second space of separation by orifice plate 2 with filter element 4, the transmission of gas to be filtered occurs in the first space, the transmission of filtering gas occurs in second space, described filter element 4 has the filtering material that is made of high density porous polyethylene support 401b and the close attachment expanded PTFE filtration membrane 401a on high density porous polyethylene support 401b surface, described expanded PTFE filtration membrane 401a treats the eliminating rate of dust of particle diameter in filtering gas 〉=0.5 μ m more than 99%.The high density porous polyethylene support 401b that uses due to filter element 4 in the front end deduster has higher strength and stiffness, after adhering to expanded PTFE filtration membrane 401a on it, expanded PTFE filtration membrane 401a is subject to the surface support of high density porous polyethylene support 401b, makes soft expanded PTFE filtration membrane 401a own significantly distortion can not occur under filtration and blowback airflow function.
In front end deduster shown in Figure 1, in fact the first above-mentioned space refers to be positioned in shell 3 chamber of orifice plate 2 belows; In fact above-mentioned second space refers to be positioned in shell 3 chamber of orifice plate 2 tops.Obviously, for realizing the transmission of gas, the first space must communicate with gas source to be filtered, and second space must communicate with the suction port of turbine gas compressor 8.Specifically, front end deduster shown in Figure 1 is one and is arranged on outdoor air dust remover, and this deduster supports on the ground by support 5, and the bottom of its shell 3 is directly to open wide; Because the bottom of its shell 3 is directly opened wide, consider necessary protection, the bottom of this deduster also is provided with purse seine 6.Obviously, for this air dust remover, air to be filtered directly enters the first space from the bottom of its shell 3, after filtering through filter element 4, clean air discharges and enters by pipeline 7 suction port of turbine gas compressor 8 again from second space, airborne dust to be filtered is blocked in the expanded PTFE filtration membrane 401a outside of filter element 4.And for back-blowing dust removing device 1, as shown in Figure 1, it mainly comprises pulse backblowing generating means 101 and injection tube 102.Winding-up mouth on injection tube 102 is corresponding with the opening end of each chimney filter 401 respectively.
As shown in Fig. 1 to 5, for enough large filter area is provided, guarantee the filtration flux of front end deduster, filter element 4 in the front end deduster comprises the chimney filter 401 of many end openings and the other end sealing, the opening end of these chimney filters 401 is positioned at second space one side, the external tube layer that each chimney filter 401 comprises the inner tube layer that is made of high density porous polyethylene support 401b and is attached on described inner tube outer surface and is made of expanded PTFE filtration membrane 401a.For such filter element, the quantity of chimney filter 401 is more, and the filter area of deduster is just larger.
If the huge chimney filter 401 of quantity can only be installed separately, certainly will cause the use inconvenience of front end deduster.For this reason, but described filter element 4 comprises the filter element of at least one group of integral installation in shell 3, every group of filter element comprises many described chimney filters 401, and each chimney filter 401 in same group of filter element connects as one by the first termination link 402 and the second termination link 403; Described the first termination link 402 is arranged on described orifice plate 2 and is provided with respectively vent 402a with the opening end conducting of described each chimney filter 401.As shown in Figure 1, the first termination link 402 of filter element specifically is pressed on orifice plate 2 tops by pressing plate 9.
The first above-mentioned termination link 402 and the second termination link 403 preferably adopt polyvinyl plastics or the other materials close with polyvinyl plastics character, so that the mode by heating realizes being connected of the second termination link 403 and the first termination link 402 and chimney filter 401.In addition, as shown in Fig. 2 to 5, the surface that contacts with orifice plate 2 on the first termination link 402 also is provided with the annular sealing strip 402b that surrounds simultaneously all vent 402a, realizes the integral sealing of orifice plate 2 with same filter element.In addition, the second termination link 403 is consisted of by the sealing plate that doubles as the closed end of described each chimney filter 401.
The above-mentioned front end deduster of the present invention is to produce negative pressure by turbine gas compressor 8 to make Air Flow.Under normal filtration condition, air to be filtered enters the first space from the bottom of front end outer case of dust remover 3, after filtering through filter element 4, clean air discharges and enters by pipeline 7 suction port of turbine gas compressor 8 again from second space, airborne dust to be filtered is blocked in the expanded PTFE filtration membrane 401a outside of filter element 4; After back-blowing dust removing device 1 starts, by the pulse backblowing air-flow, expanded PTFE filtration membrane 401a is carried out reverse deashing.Embody stronger rigidity under the support of high density porous polyethylene support due to the expanded PTFE filtration membrane, can't be because filtering and blowback is frequently switched with air-flow break-in repeated deformation, thus overcome the shortcoming of flexible filtering material.
The filtering material that uses in the above-mentioned embodiment of the present invention, it is the mode close attachment (this film mulching method is prior art) on high density porous polyethylene support 401b that expanded PTFE filtration membrane 401a is covered by heat, because expanded PTFE filtration membrane 401a and high density porous polyethylene support 401b are close polymer, therefore both associativities are very good.As seen in Figure 6, by high density porous polyethylene support 401b and close attachment in the filtering material that the expanded PTFE filtration membrane 401a on high density porous polyethylene support 401b surface consists of, the aperture of the expanded PTFE filtration membrane 401a on upper strata is far smaller than the high density porous polyethylene support 401b of lower floor, therefore, high density porous polyethylene support 401b only plays a supportive role, and does not participate in filtering.As seen in Figure 7, expanded PTFE filtration membrane 401a has formed fibrous blind hole after by tensile buckling on polytetrafluoroethylmaterial material.Wherein, can control the hole density of expanded PTFE filtration membrane 401a according to the amount of tension to polytetrafluoroethylmaterial material.
Because high density porous polyethylene support 401b does not participate in filtering, therefore, the strainability to the front end deduster of expanded PTFE filtration membrane 401a plays a decisive role.The specific embodiment of the present invention requires expanded PTFE filtration membrane 401a to reach the eliminating rate of the dust for the treatment of particle diameter in filtering gas 〉=0.1 μ m at the filter precision more than 99%.Find by actual verification, the eliminating rate of the dust of particle diameter in treating filtering gas 〉=0.1 μ m is under the filter precision more than 99%, and turbine gas compressor is not found scale formation in operation after 1 year.In addition, angle from practical application, for under the prerequisite that guarantees than high filtering precision, produce larger filtration flux with less filter pressure, the specific embodiment of the present invention also further is set as 5 * 10 with the hole density of expanded PTFE filtration membrane 401a
8Individual/cm
2To 30 * 10
8Individual/cm
2Be set in above-mentioned scope by the hole density with expanded PTFE filtration membrane 401a, can make the filter efficiency of expanded PTFE filtration membrane 401a reach more satisfactory degree.
Test finds, in the situation that the porosity ratio of high density porous polyethylene support 401b is all 30%, when the hole density of expanded PTFE filtration membrane 401a is 15 * 10
8Individual/cm
2, when filtration pressure difference equaled 190 handkerchief, filtration flux was 2m
3/ m
2Min.Keep in the constant situation of filtration flux, the hole density of expanded PTFE filtration membrane 401a is further improved, filtration pressure difference can reduce.On the contrary, keep in the constant situation of filtration flux, with the hole density reduction of expanded PTFE filtration membrane 401a, filtration pressure difference can raise.Density is reduced to 5 * 10 when the hole
8Individual/cm
2The time, filtration pressure difference is elevated to 500 about handkerchiefs, near turbine gas compressor institute capacity limit, therefore the hole density of expanded PTFE filtration membrane 401a is defined as 5 * 10
8Individual/cm
2Above.According to the preparation process of present expanded PTFE filtration membrane 401a, the hole density of expanded PTFE filtration membrane 401a is defined as 30 * 10
8Individual/cm
2Below.
Table 1 is for keeping filtration flux at 2m
3/ m
2During min, the hole density of expanded PTFE filtration membrane 401a and the relation of filtration pressure difference (porosity ratio of high density porous polyethylene support 401b is all 30%).Therefrom can find out, when the hole density of expanded PTFE filtration membrane 401a from 5 * 10
8Individual/cm
2Become 10 * 10
8Individual/cm
2The time, filtration pressure difference obviously reduces; When the hole density of expanded PTFE filtration membrane 401a from 10 * 10
8Individual/cm
2Become 25 * 10
8Individual/cm
2Process in, what filtration pressure difference was comparatively mild is reduced to 160 handkerchiefs from 235 handkerchiefs; When the hole density of expanded PTFE filtration membrane 401a further from 25 * 10
8Individual/cm
2Become 30 * 10
8Individual/cm
2The time, the variation of filtration pressure difference is very little.Therefore, preferably the hole density of expanded PTFE filtration membrane 401a is set as 10 * 10
8Individual/cm
2To 25 * 10
8Individual/cm
2
Table 1
Above-mentioned test is in the situation that the porosity ratio of high density porous polyethylene support 401b is all 30% carries out.The porosity ratio of high density porous polyethylene support 401b can be set between 25% to 70%, is preferably between 30% to 60%.
Claims (10)
1. turbine gas compressor front end deduster, comprise shell (3), the back-blowing dust removing device (1) that is arranged on the filter element (4) in shell (3) and acts on filter element (4), described shell (3) is connected and forms the first space and the second space of separation by orifice plate (2) with filter element (4), the transmission of gas to be filtered occurs in the first space, the transmission of filtering gas occurs in second space, it is characterized in that: described filter element (4) has the filtering material that is made of at the surperficial expanded PTFE filtration membrane (401a) of high density porous polyethylene support (401b) high density porous polyethylene support (401b) and close attachment, described expanded PTFE filtration membrane (401a) is treated the eliminating rate of dust of particle diameter in filtering gas 〉=0.5 μ m more than 99%.
2. turbine gas compressor front end deduster as claimed in claim 1, it is characterized in that: described filter element (4) comprises the chimney filter (401) of many end openings and the other end sealing, the opening end of these chimney filters (401) is positioned at second space one side, the external tube layer that each chimney filter (401) comprises the inner tube layer that is made of high density porous polyethylene support (401b) and is attached on described inner tube outer surface and is made of expanded PTFE filtration membrane (401a).
3. turbine gas compressor front end deduster as claimed in claim 2, it is characterized in that: described filter element (4) but comprise the filter element of at least one group of integral installation in shell (3), every group of filter element comprises many described chimney filters (401), and each chimney filter (401) in same group of filter element connects as one by the first termination link (402) and the second termination link (403); Described the first termination link (402) is arranged on described orifice plate (2) and goes up and be provided with respectively vent (402a) with the opening end conducting of described each chimney filter (401).
4. turbine gas compressor front end deduster as claimed in claim 3 is characterized in that: described the first termination link (402) upper surface that contacts with orifice plate (2) is provided with the annular sealing strip (402b) that surrounds simultaneously all vents (402a).
5. turbine gas compressor front end deduster as claimed in claim 3 is characterized in that: described the second termination link (403) is consisted of by the sealing plate that doubles as described each chimney filter (401) closed end.
6. as the described turbine gas compressor front end of any one claim deduster in claim 1 to 5, it is characterized in that: the hole density of described expanded PTFE filtration membrane (401a) is 5 * 10
8Individual/cm
2To 30 * 10
8Individual/cm
2
7. as the described turbine gas compressor front end of any one claim deduster in claim 1 to 5, it is characterized in that: described expanded PTFE filtration membrane (401a) is treated the eliminating rate of dust of particle diameter in filtering gas 〉=0.1 μ m more than 99%.
8. be used for the filter element of the described turbine gas compressor front end of claim 1 to 7 any one claim deduster, it is characterized in that: this filter element (4) has the filtering material that is made of at the surperficial expanded PTFE filtration membrane (401a) of high density porous polyethylene support (401b) high density porous polyethylene support (401b) and close attachment; Described expanded PTFE filtration membrane (401a) is treated the eliminating rate of dust of particle diameter in filtering gas 〉=0.5 μ m more than 99%.
9. filter element as claimed in claim 8, it is characterized in that: described filter element (4) comprises chimney filter (401), the external tube layer that described chimney filter (401) comprises the inner tube layer that is made of high density porous polyethylene support (401b) and is attached on described inner tube outer surface and is made of expanded PTFE filtration membrane (401a).
10. filter element as claimed in claim 9, it is characterized in that: described filter element (4) comprises filter element, described filter element comprises many described chimney filters (401), and wherein each chimney filter (401) connects as one by the first termination link (402) and the second termination link (403); Described the first termination link (402) is provided with respectively the vent (402a) with the opening end conducting of described each chimney filter (401).
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|---|---|---|---|
| CN201310024020.8A CN103089714B (en) | 2013-01-23 | 2013-01-23 | Turbine gas compressor front end deduster and filter element thereof |
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| CN201310024020.8A CN103089714B (en) | 2013-01-23 | 2013-01-23 | Turbine gas compressor front end deduster and filter element thereof |
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Cited By (4)
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| CN111672226A (en) * | 2020-02-25 | 2020-09-18 | 成都瑞柯林工程技术有限公司 | Device for preventing dew condensation on surface of filter element and filter system using same |
| WO2021074139A1 (en) * | 2019-10-15 | 2021-04-22 | Herding Gmbh Filtertechnik | Filter element, filter element holder for a filter element, a filter device and a method for producing a filter element |
| CN114855232A (en) * | 2022-04-14 | 2022-08-05 | 南通盛杰拉链有限公司 | Metal zipper gold plating device based on automatic circulation |
| US11883763B2 (en) | 2019-09-13 | 2024-01-30 | Donaldson Company, Inc. | Air filter systems, filter bag assemblies, filter bags and methods |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11883763B2 (en) | 2019-09-13 | 2024-01-30 | Donaldson Company, Inc. | Air filter systems, filter bag assemblies, filter bags and methods |
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| CN114855232A (en) * | 2022-04-14 | 2022-08-05 | 南通盛杰拉链有限公司 | Metal zipper gold plating device based on automatic circulation |
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