A cascade recovery pipeline filtration device for an air separation compressor

Abstract

This invention provides a cascade recovery pipeline filtration device for an air separation compressor, relating to the field of filtration equipment technology. It includes a main filter chamber, an outer filter element, and an outer support. The outer filter element is housed inside the main filter chamber, and the outer support is located on the inner side of the outer filter element. A lower slag collection trough is located at the bottom of the main filter chamber, and a middle slag discharge pipe is located at the lowest point of the lower slag collection trough. A main exhaust pipe is connected to one side of the main filter chamber, and an outlet exhaust pipe is axially arrayed and connected to the other side of the main filter chamber. A maintenance cover is fixedly connected to the first end of the main filter chamber. The main exhaust pipe connects to the main air supply pipe, and the outlet exhaust pipe connects to the recovery branch pipes of each pressure level in the cascade recovery system. A single main filter chamber can meet the simultaneous filtration needs of the main air supply pipe and the recovery branch pipes, reducing the number of filtration devices, lowering maintenance workload, and solving the problems of a large number of filtration devices, high maintenance workload, and heavy maintenance burden.

Description

Technical Field

[0001] This invention relates to the field of filtration equipment technology, and in particular to a cascade recovery pipeline filtration device for an air separation compressor. Background Technology

[0002] An air separation compressor is a device that performs multi-stage compression, purification, and transportation of air. It provides a stable and clean high-pressure air source for industrial production. The air supplied by the air separation compressor is also filtered by a filter device to remove solid impurities, ensuring the cleanliness of the air.

[0003] Existing filtration devices generally adopt a single branch single filter configuration mode. The main air supply pipeline of the air separation compressor and each stage recovery branch pipeline need to be equipped with a separate filtration device, which results in a large number of filtration devices, high cost, and scattered filtration device locations. Daily inspection, filter replacement, and troubleshooting need to be performed on each device and point, resulting in a large workload and heavy maintenance burden. Summary of the Invention

[0004] This invention provides a cascade recovery pipeline filtration device for an air separation compressor. The main outlet pipe connects to the main supply pipe, and the outlet pipe connects to the recovery branch pipes of each pressure level in the cascade recovery system. A single main filter chamber can meet the synchronous filtration work of the main supply pipe and the recovery branch pipes, reducing the number of filter devices and solving the problem of high maintenance workload caused by installing filter devices on both the main supply pipe and the recovery branch pipes. By switching the airflow direction when the main outlet pipe and the outlet pipe are in operation, the outer support, the first cleaning disc, the outer cleaning ring, and the inner cleaning ring can be driven to move synchronously and reciprocally along the axial direction. The axial movement of the first cleaning disc, the outer cleaning ring, and the inner cleaning ring realizes the cleaning operation of the outer and inner filter elements, removing the deposits inside the outer and inner filter elements, and extending the service life and maintenance interval of the outer and inner filter elements.

[0005] This invention provides a cascade recovery pipeline filtration device for an air separation compressor, specifically comprising: a main filter chamber, an outer filter element, and an outer support. The outer filter element is disposed inside the main filter chamber, and an outer support is disposed inside the outer filter element. A lower slag collection trough is provided at the lower part of the main filter chamber, and a middle slag discharge pipe is provided at the lowest point of the lower slag collection trough. The middle slag discharge pipe is equipped with a valve for opening and closing to discharge the filtered slag. A main exhaust pipe is connected to one side of the main filter chamber, and an exhaust pipe is axially connected to the other side of the main filter chamber. A maintenance cover is bolted to the flange at the front end of the main filter chamber, allowing for the maintenance and replacement of the main filter chamber and the outer filter element. The rear end of the main filter chamber is bolted to the flange of the air separation compressor, allowing the air from the air separation compressor to directly enter the inner filter element and be filtered by the inner and outer filter elements.

[0006] The top of the outer filter element is fixedly connected to a top positioning block, the lower part of the outer filter element is provided with an outer lower slag discharge groove, the inner side of the outer filter element is fixedly connected to an inner filter element, the lower part of the inner filter element is provided with an inner lower slag discharge groove, and the tail end of the outer filter element is fixedly connected to a tail positioning plate.

[0007] Furthermore, the inner lower slag discharge trough is fixed inside the outer lower slag discharge trough, and the outer wall of the inner lower slag discharge trough and the inner wall of the outer lower slag discharge trough are spaced apart. The space between the outer wall of the inner lower slag discharge trough and the inner wall of the outer lower slag discharge trough serves as a channel for filtered impurities to fall inside the outer lower slag discharge trough.

[0008] Furthermore, the top positioning block is slidably attached to the top of the inner side of the main filter chamber, and the lower end of the outer lower slag discharge trough is slidably attached to the inner side of the main filter chamber. The outer lower slag discharge trough and the lower slag collection trough are aligned and connected. The filter impurities inside the outer filter screen and the inner filter screen enter the lower slag collection trough through the inner lower slag discharge trough and the outer lower slag discharge trough. The filter impurities are uniformly settled and collected in the lower slag collection trough and discharged centrally through the middle slag discharge pipe.

[0009] Furthermore, the first end of the outer support is fixedly connected to a first cleaning disc, the middle and the tail ends of the outer support are fixedly connected to outer cleaning rings, the center of the first cleaning disc is fixedly connected to the first end of the inner connecting slide, and the middle and the tail ends of the inner connecting slide are fixedly connected to inner cleaning rings.

[0010] Furthermore, the outer walls of the first cleaning disc and the outer cleaning ring are equipped with rubber rings that slide and fit against the inner wall of the outer filter element. The outer cleaning ring surrounds the outer side of the inner filter element, and the outer cleaning ring and the inner filter element are spaced apart. The outer cleaning ring and the inner cleaning ring form a stable blocking and diversion effect on the airflow in the filter cavity.

[0011] Furthermore, the inner connecting slide column and the inner filter screen are slidably connected. The outer wall of the inner cleaning ring is provided with a rubber ring that slides and fits inside the inner filter screen. By utilizing the change in airflow direction when switching between the main air outlet and the outlet air outlet, the outer support, the first cleaning disc, the outer cleaning ring and the inner cleaning ring are driven to move synchronously back and forth along the axial direction, thereby realizing the reciprocating scraping and cleaning of the outer filter screen and the inner wall of the inner filter screen, effectively removing the filter cake and dust adhering to the inner wall of the filter screen.

[0012] Furthermore, the tail end of the inner filter element is connected to the central through hole of the tail positioning plate, the tail positioning plate and the tail end groove of the main filter compartment are inserted into each other, the tail end of the main filter compartment is connected to the air outlet pipe of the air separation compressor, and the airflow of the air separation compressor passes through the central through hole of the tail positioning plate from the tail end of the main filter compartment and enters the inner filter element.

[0013] This invention provides a cascade recovery pipeline filtration device for an air separation compressor, which has the following beneficial effects: The main exhaust pipe connects to the main air supply pipe, and the exhaust pipe connects to the recovery branch pipes of each pressure level in the cascade recovery system. A single main filter chamber can meet the synchronous filtration work of the main air supply pipe and the recovery branch pipes, reducing the number of filter devices and avoiding the problem of large maintenance workload caused by installing filter devices on both the main air supply pipe and the recovery branch pipes, thus reducing the maintenance burden.

[0014] The outer and inner filter elements work together to achieve dual filtration, improving the filtration and purification effect. The impurities filtered by the outer and inner filter elements fall into the lower slag collection tank through the outer and inner lower slag discharge troughs, realizing the unified collection and discharge of the filtered impurities, avoiding the accumulation and blockage of filter residue inside the filter screen, and reducing the maintenance pressure of the outer and inner filter elements.

[0015] The outer and inner cleaning rings block and divert the airflow inside the outer and inner filter elements, achieving a uniform axial distribution of airflow within them. This prevents airflow from concentrating at the nearest outlet, which can lead to uneven axial filtration load and reduced overall filtration efficiency. It also improves the uniformity of axial airflow in the outer and inner filter elements, fully utilizing the entire effective filtration area of ​​the filter, thus increasing filtration efficiency and extending the filter's lifespan.

[0016] By utilizing the change in airflow direction when switching between the main outlet pipe and the outlet pipe, the outer support, the first cleaning disc, the outer cleaning ring, and the inner cleaning ring can be driven to move synchronously back and forth along the axial direction. The axial movement of the first cleaning disc, the outer cleaning ring, and the inner cleaning ring realizes the cleaning operation of the outer and inner filter elements, removes the deposits inside the outer and inner filter elements, avoids the problems of increased pressure difference and reduced flow capacity caused by filter clogging, extends the service life and maintenance interval of the outer and inner filter elements, and reduces maintenance costs. Attached Figure Description

[0017] To more clearly illustrate the technical solution of the present invention, the accompanying drawings of the present invention will be briefly described below.

[0018] The accompanying drawings described below are only related to some embodiments of the invention and are not intended to limit the invention.

[0019] In the attached diagram: Figure 1 A schematic diagram of the overall structure of this application is shown; Figure 2 This invention provides a structural schematic diagram of the cross-sectional view of the main filter chamber. Figure 3 This invention provides a schematic diagram of the cross-sectional structure of the outer filter element. Figure 4 A schematic diagram of the structure of the lower slag discharge trough of this application is shown; Figure 5A structural schematic diagram of the transverse cross-section of the internal filter element of this application is shown; Figure 6 This invention provides a structural schematic diagram showing the longitudinal cross-section of the outer filter element and the inner filter element. Figure 7 A schematic diagram of the lower slag collection tank of this application is shown; Figure 8 A schematic diagram of the structure of the outer filter element and the main filter chamber of this application in a separated state is shown.

[0020] Figure label: 1. Main filter chamber; 101. Lower slag collection trough; 102. Middle slag discharge pipe; 103. Main air outlet pipe; 104. Outlet air pipe; 105. Inspection cover plate; 2. Outer filter screen; 201. Top positioning block; 202. Lower outer slag discharge trough; 203. Inner filter screen; 204. Lower inner slag discharge trough; 205. Tail positioning plate; 3. Outer support; 301. First cleaning plate; 302. Outer cleaning ring; 303. Inner connecting slide; 304. Inner cleaning ring. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0022] Example 1: Please refer to... Figures 1 to 8 : This invention proposes a cascade recovery pipeline filtration device for an air separation compressor, comprising a main filter chamber 1, an outer filter element 2, and an outer support 3. A lower slag collection trough 101 is provided at the lower part of the main filter chamber 1, and a middle slag discharge pipe 102 is provided at the lowest point of the lower slag collection trough 101. The middle slag discharge pipe 102 is equipped with a valve for opening and closing to discharge filter slag. A main exhaust pipe 103 is connected to one side of the main filter chamber 1, and an exhaust pipe 104 is axially connected to the other side of the main filter chamber 1. A maintenance cover 105 is bolted to the flange at the front end of the main filter chamber 1, allowing for the maintenance and replacement of the main filter chamber 1 and the outer filter element 2. The rear end of the main filter chamber 1 is bolted to the flange of the air separation compressor. With the gas from the air separation compressor directly entering the inner filter element 203 and being filtered by both the inner filter element 203 and the outer filter element 2, the main outlet pipe 103 is connected to the high-pressure gas storage tank. Multiple outlet pipes 104 are connected to low-pressure gas storage tanks of various pressure levels through pipelines to recover excess gas. It can simultaneously connect to the main gas supply network and the recovery branch pipes of various pressure levels of the cascade recovery system. A single filter device can achieve synchronous filtration and purification of the main gas supply airflow and the excess recovery airflow, solving the problem of scattered equipment locations, large number of configurations, and large maintenance workload caused by the need to set up filter devices independently for the main gas supply pipeline and each recovery branch. This further reduces the burden of daily maintenance and the cost of full-cycle maintenance. The main filter chamber 1 is equipped with an outer filter element 2. A top positioning block 201 is fixedly connected to the top of the outer filter element 2. An outer lower slag discharge trough 202 is provided at the bottom of the outer filter element 2. Inner filter elements 203 are fixedly connected to the inner side of the outer filter element 2 at intervals. Both the outer filter element 2 and the inner filter element 203 are cylindrical mesh structures. An inner lower slag discharge trough 204 is provided at the bottom of the inner filter element 203 and is fixed inside the outer lower slag discharge trough 202. A tail positioning plate 205 is fixedly connected to the tail end of the outer filter element 2. The tail positioning plate 205 is fixedly connected to the tail end of the inner filter element 203. The outer filter element 2 and the inner filter element 203 form a two-stage filtration structure, which improves the filtration accuracy and purification effect. The tail end of the inner filter element 203 is connected to the central through hole of the tail positioning plate 205. The tail positioning plate 205 and the tail end groove of the main filter chamber 1 are inserted into each other. The tail end of the main filter chamber 1 is connected to the air outlet pipe of the air separation compressor. The airflow of the air separation compressor passes through the central through hole of the tail positioning plate 205 from the tail end of the main filter chamber 1 and enters the inner filter element 203 to achieve air filtration. An outer support 3 is provided on the inner side of the outer filter element 2. The first cleaning plate 301 is fixedly connected to the first end of the outer support 3. The middle and tail ends of the outer support 3 are fixedly connected to the outer cleaning ring 302. The center of the first cleaning plate 301 is fixedly connected to the first end of the inner connecting slide column 303. The middle and tail ends of the inner connecting slide column 303 are fixedly connected to the inner cleaning ring 304.

[0023] In this embodiment, the inner lower slag discharge trough 204 is fixed inside the outer lower slag discharge trough 202. The outer wall of the inner lower slag discharge trough 204 and the inner wall of the outer lower slag discharge trough 202 are spaced apart. The space between the outer wall of the inner lower slag discharge trough 204 and the inner wall of the outer lower slag discharge trough 202 serves as a channel for filtered impurities to fall into the outer lower slag discharge trough 202. The filtered impurities are uniformly settled and collected in the lower slag collection trough 101 and discharged centrally through the middle slag discharge pipe 102. There is no need to disassemble and open the chamber for slag cleaning, which reduces the daily maintenance pressure of the filter screen.

[0024] In this embodiment, the top positioning block 201 is slidably attached to the top of the inner side of the main filter chamber 1, and the lower end of the outer lower slag discharge trough 202 is slidably attached to the inner side of the main filter chamber 1. The outer lower slag discharge trough 202 and the lower slag collection trough 101 are aligned and connected. The filter impurities inside the outer filter screen 2 and the inner filter screen 203 enter the lower slag collection trough 101 through the inner lower slag discharge trough 204 and the outer lower slag discharge trough 202. The filter impurities are uniformly settled and collected in the lower slag collection trough 101 and discharged centrally through the middle slag discharge pipe 102 to avoid the filter residue from accumulating and clogging inside the filter screen.

[0025] In this embodiment, the outer walls of the first cleaning disc 301 and the outer cleaning ring 302 are provided with rubber rings that slide and fit against the inner wall of the outer filter element 2. The outer cleaning ring 302 surrounds the outer side of the inner filter element 203. The outer cleaning ring 302 and the inner filter element 203 are spaced apart. The outer cleaning ring 302 and the inner cleaning ring 304 form a stable blocking and diversion effect on the airflow in the filter cavity, forcing the airflow to be evenly distributed along the filter axis. This avoids the situation where, when air is discharged from the main air outlet pipe 103, the air volume of the outer filter element 2 is the largest on the side closer to the main air outlet pipe 103 and the air volume of the outer filter element 2 further away from the main air outlet pipe 103 is small, resulting in uneven filtration of the outer filter element 2 and low filtration efficiency.

[0026] In this embodiment, the inner connecting slide column 303 and the inner filter screen 203 are slidably connected. The outer wall of the inner cleaning ring 304 is provided with a rubber ring that slides and fits inside the inner filter screen 203. By utilizing the change in airflow direction when the main air outlet pipe 103 and the outlet air outlet pipe 104 switch ventilation, the outer support 3, the first cleaning disc 301, the outer cleaning ring 302 and the inner cleaning ring 304 are pushed to move synchronously along the axial direction, thereby realizing the reciprocating scraping and cleaning of the outer filter screen 2 and the inner wall of the inner filter screen 203, effectively removing the filter cake and dust adhering to the inner wall of the filter screen.

[0027] In this second embodiment, based on the first embodiment, a spiral tension spring is provided between the first cleaning disc 301 and the inner filter screen 203. When the main exhaust pipe 103 is closed and the outlet pipe 104 is opened for excess gas recovery, the spiral tension spring pulls the first cleaning disc 301 quickly toward the outlet pipe 104, accelerating the movement and reset speed of the outlet pipe 104.

[0028] The working principle of this invention is as follows: The main filter chamber 1 has one end with an inspection cover 105 as its head end and the other end connected to the air supply pipeline of the air separation compressor as its tail end. The side closer to the central axis of the main filter chamber 1 is the inner side, and the side farther from the central axis is the outer side. The direction along the central axis of the main filter chamber 1 is the axial direction. The main outlet pipe 103 and multiple sets of axially arrayed outlet pipes 104 are integrated on the main filter chamber 1. The main outlet pipe 103 is connected to the high-pressure gas storage tank. The multiple sets of outlet pipes 104 are connected to low-pressure gas storage tanks of various pressure levels through pipelines to recover excess gas. It can simultaneously connect to the main gas supply pipeline and the recovery branch pipes of various pressure levels of the cascade recovery. The main gas supply airflow and the excess recovery airflow can be simultaneously filtered and purified by a single set of filter devices. This solves the industry pain points of the prior art, which requires separate filter devices for the main gas supply pipeline and each recovery branch, resulting in scattered equipment locations, a large number of configurations, high investment costs, and a large workload of operation and maintenance. It reduces the burden of daily maintenance and the cost of operation and maintenance throughout the entire cycle. The airflow from the air separation compressor passes through the central through-hole of the tail positioning plate 205 from the tail end of the main filter chamber 1 and enters the inner filter screen 203. The airflow is then filtered by the inner filter screen 203 and the outer filter screen 2. The outer filter screen 2 and the inner filter screen 203, which are coaxially nested, form a two-stage filtration structure, which improves the filtration accuracy and purification effect and ensures the cleanliness of the air source in the main air supply network and each recovery branch. With the inner lower slag discharge trough 204 and the outer lower slag discharge trough 202 correspondingly set at the bottom of the outer filter screen 2 and the inner filter screen 203, as well as the lower slag collection trough 101 at the bottom of the main filter chamber 1, the filtered impurities are uniformly settled and collected in the lower slag collection trough 101 and discharged centrally through the middle slag discharge pipe 102, which avoids the accumulation and blockage of filter residue inside the filter screen. At the same time, there is no need to disassemble and open the two-stage filter screen separately for slag removal, which greatly reduces the daily maintenance pressure of the filter screen. The outer cleaning ring 302 and inner cleaning ring 304, which are spaced apart on the outer support 3, can form a stable obstruction and diversion effect on the airflow in the filter cavity, forcing the airflow to be evenly distributed along the filter axis. This solves the problem that when the existing filter device is venting through a single branch, the air volume of the outer filter element 2 is the largest on the side closer to the main air outlet pipe 103 when air is discharged from the main air outlet pipe 103, while the air volume of the outer filter element 2 further away from the main air outlet pipe 103 is smaller. This uneven filtration of the outer filter element 2 reduces the filtration efficiency of the outer filter element 2. At the same time, it is compatible with the full-condition operation mode of the main air outlet pipe 103 supplying air alone and multiple sets of outlet pipes 104 recovering excess gas separately. This ensures the uniformity of axial flow of the outer filter element 2 and the inner filter element 203 throughout the entire section under different air discharge modes, making full use of the entire effective filtration area of ​​the filter, improving filtration efficiency and filter life. When the main outlet pipe 103 is closed and the outlet pipe 104 is opened for excess gas recovery, the change in airflow direction will push the outer support 3, the first cleaning plate 301, the outer cleaning ring 302, and the inner cleaning ring 304 to move synchronously towards the outlet pipe 104. After the main outlet pipe 103 is opened and the outlet pipe 104 is closed, the outer support 3, the first cleaning plate 301, the outer cleaning ring 302, and the inner cleaning ring 304 will be pushed back to their original positions by the airflow. By utilizing the change in airflow direction when the main outlet pipe 103 and the outlet pipe 104 switch ventilation, the outer support 3, the first cleaning plate 301, the outer cleaning ring 302, and the inner cleaning ring 304 can be pushed to move synchronously back and forth along the axial direction, without the need for By adding electric or pneumatic drive mechanisms, the outer filter element 2 and the inner wall of the inner filter element 203 can be reciprocated for cleaning. This effectively removes filter cake and dust adhering to the inner wall of the filter, avoiding problems such as increased pressure difference and decreased flow capacity caused by filter clogging. Filter cleaning can be completed without stopping the machine, extending the service life and maintenance interval of the filter, reducing the frequency of manual cleaning and filter replacement, lowering equipment operation and maintenance costs and unplanned downtime, and adapting to the long-term continuous and stable operation requirements of air separation units. After the inspection cover 105 is removed, the outer filter element 2 can be taken out from inside the main filter chamber 1 to the outside for maintenance of the outer filter element 2 and the inner filter element 203.

[0029] The following points should be noted in this article: 1. The accompanying drawings of the embodiments disclosed herein only involve structures relevant to the embodiments disclosed herein; other structures may refer to general designs.

[0030] 2. Where there is no conflict, the embodiments of this disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.

[0031] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A cascade recovery pipeline filtration device for an air separation compressor, comprising: The main filter chamber (1), the outer filter screen (2) and the outer support (3) are characterized in that the main filter chamber (1) is provided with an outer filter screen (2) inside, and an outer support (3) is provided on the inner side of the outer filter screen (2). The lower part of the main filter chamber (1) is provided with a lower slag collection trough (101), and the lowest point of the lower slag collection trough (101) is provided with a middle slag discharge pipe (102). One side of the main filter chamber (1) is connected to a main air outlet pipe (103), and the other side of the main filter chamber (1) is axially connected to an exhaust pipe (104). The head end of the main filter chamber (1) is fixedly connected to a maintenance cover plate (105).

2. The cascade recovery pipeline filtration device for an air separation compressor according to claim 1, characterized in that, The top of the outer filter element (2) is fixedly connected to a top positioning block (201), the lower part of the outer filter element (2) is provided with an outer lower slag discharge groove (202), the inner side of the outer filter element (2) is fixedly connected to an inner filter element (203), the lower part of the inner filter element (203) is provided with an inner lower slag discharge groove (204), and the tail end of the outer filter element (2) is fixedly connected to a tail positioning plate (205).

3. The cascade recovery pipeline filtration device for an air separation compressor according to claim 2, characterized in that, The inner lower slag discharge trough (204) is fixed inside the outer lower slag discharge trough (202), and the outer wall of the inner lower slag discharge trough (204) and the inner wall of the outer lower slag discharge trough (202) are spaced apart.

4. The cascade recovery pipeline filtration device for an air separation compressor according to claim 3, characterized in that, The top positioning block (201) is slidably attached to the top of the inner side of the main filter chamber (1), and the lower end of the outer lower slag discharge trough (202) is slidably attached to the inner side of the main filter chamber (1). The outer lower slag discharge trough (202) and the lower slag collection trough (101) are aligned and connected.

5. A cascade recovery pipeline filtration device for an air separation compressor according to claim 2, characterized in that, The first end of the outer support (3) is fixedly connected to the first cleaning plate (301), and the middle and tail ends of the outer support (3) are fixedly connected to the outer cleaning ring (302). The center of the first cleaning plate (301) is fixedly connected to the first end of the inner connecting slide (303), and the middle and tail ends of the inner connecting slide (303) are fixedly connected to the inner cleaning ring (304).

6. A cascade recovery pipeline filtration device for an air separation compressor according to claim 5, characterized in that, The outer walls of the first cleaning disc (301) and the outer cleaning ring (302) and the inner wall of the outer filter element (2) slide together. The outer cleaning ring (302) surrounds the outer side of the inner filter element (203), and the outer cleaning ring (302) and the inner filter element (203) are spaced apart.

7. A cascade recovery pipeline filtration device for an air separation compressor according to claim 6, characterized in that, The inner connecting slide column (303) and the inner filter screen (203) are slidably connected through each other, and the outer wall of the inner cleaning ring (304) and the inside of the inner filter screen (203) are slidably fitted together.

8. A cascade recovery pipeline filtration device for an air separation compressor according to claim 7, characterized in that, The tail end of the inner filter element (203) is connected to the central through hole of the tail positioning disk (205), and the tail positioning disk (205) is inserted into the tail end of the main filter chamber (1).

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