A device for multi-stage filtering of impurities in a mine air duct

Abstract

The utility model discloses a device is carried out multistage filtration to the impurity in roadway pressure wind pipeline, including filter outer casing, filter outer casing is cylindrical, the side surface of filter outer casing is close to the bottom and is provided with the air inlet, and the top of filter outer casing is provided with upper end cover, and the center of upper end cover is provided with the air outlet, the inner wall of filter outer casing is provided with annular adsorption magnet, and annular adsorption magnet is cylindrical, and the outer diameter of annular adsorption magnet is equal with the inner diameter of filter outer casing, and annular adsorption magnet sets up the top of air inlet, the top of annular adsorption magnet is provided with filter core, and filter core sets up the bottom of upper end cover, the utility model guarantees the normal use of wind equipment, and the whole structure is simple and compact, can effectively avoid the component wear and tear, failure problem caused by the impurity into the wind equipment, prolongs the service life of equipment, reduces maintenance cost and shutdown frequency.

Description

Technical Field

[0001] This utility model belongs to the field of filtration device technology, specifically relating to a device for multi-stage filtration of impurities in compressed air pipelines in tunnels. Background Technology

[0002] In industries such as coal mining and metallurgy, compressed air pipelines, as the core conveying carrier of compressed air systems, play a crucial role in delivering compressed air generated by air compressors to pneumatic tools, valves, and other air-using equipment, directly supporting core production processes. However, most current compressed air pipelines are made of carbon steel. During long-term operation, they are susceptible to oxidation from the high humidity environment underground, residual welding slag and debris from installation and maintenance, and wear and tear from airflow. As a result, rust, iron filings, and other impurities easily accumulate inside. These impurities, when introduced into the air-using equipment along with the compressed air, exacerbate the wear of components such as cylinders and seals, leading to air leakage and reduced power. They can also clog precision sensors and solenoid valves, causing equipment failure and a series of other problems. This significantly shortens component replacement cycles, increases downtime frequency, and ultimately reduces the overall lifespan of the equipment. Utility Model Content

[0003] The purpose of this invention is to provide a device for multi-stage filtration of impurities in compressed air pipelines in roadways. By setting an annular adsorption magnet on the inner wall of the filter housing and setting a filter element on the top cover, the gas in the compressed air pipeline is filtered to remove rust, iron filings and other impurities from the gas, ensuring the normal operation of the air-using equipment.

[0004] The present invention adopts the following technical solution: A device for multi-stage filtration of impurities in a roadway compressed air pipeline includes a filter housing, which is cylindrical. An air inlet is provided on the side of the filter housing near the bottom, and an upper cover is provided on the top of the filter housing. An air outlet is provided at the center of the upper cover. The inner wall of the filter housing is provided with a ring-shaped adsorption magnet. The ring-shaped adsorption magnet is cylindrical, and its outer diameter is equal to the inner diameter of the filter housing. The ring-shaped adsorption magnet is located above the air inlet. A filter element is placed above the annular adsorption magnet, and the filter element is located at the bottom of the upper cover.

[0005] Furthermore, a lower end cover is provided at the bottom of the filter housing, and a spiral guide plate is fixedly connected to the upper surface of the lower end cover. The spiral guide plate is a blade-shaped structure that spirals upward from bottom to top. The outer diameter of the spiral guide plate is less than or equal to the inner diameter of the annular adsorption magnet, and the top of the spiral guide plate is located close to the top of the annular adsorption magnet.

[0006] Furthermore, a pre-filter is provided between the annular adsorption magnet and the filter element, and the diameter of the pre-filter is equal to the inner diameter of the filter housing.

[0007] Furthermore, the filter element includes an outer primary filter element and an inner secondary filter element disposed inside the outer primary filter element, with the outer primary filter element and the inner secondary filter element being coaxially arranged.

[0008] Furthermore, both the outer primary filter element and the inner secondary filter element are cylindrical. The outer diameter of the outer primary filter element is smaller than the inner diameter of the filter housing, while the inner diameter of the inner secondary filter element is greater than or equal to the diameter of the air outlet.

[0009] Furthermore, the upper cover, filter element, pre-filter, spiral guide plate, annular adsorption magnet, and lower cover are all coaxially arranged.

[0010] Furthermore, a waste discharge port is provided on the side of the filter housing near the bottom.

[0011] Furthermore, the height of the annular adsorption magnet is greater than the diameter of the air inlet, and several grooves are provided on the inner wall of the annular adsorption magnet.

[0012] Furthermore, the bottom of the upper cover has a mounting groove.

[0013] The beneficial effects of this utility model are as follows: The cylindrical filter housing and the positions of the inlet and outlet are designed so that compressed air enters from the bottom side and flows upward along the inner wall of the filter housing; the cylindrical annular adsorption magnet is adapted to the inner diameter of the filter housing, fully covering the compressed air flow section, ensuring that the compressed air entering from the inlet is fully adsorbed by the magnet, improving the removal efficiency of magnetic impurities such as rust and iron filings; the filter element is positioned above the magnet, further intercepting non-ferrous particles; the overall structure of this utility model is simple and compact, effectively avoiding component wear and failure caused by impurities entering the air-using equipment, extending equipment lifespan, and reducing maintenance costs and downtime frequency. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a cross-sectional view of the present invention; Figure 3 This is a schematic diagram of the internal structure of the present invention; Figure 4 This is a schematic diagram of the structure of the filter screen in this utility model; Figure 5 This is a schematic diagram of the spiral guide plate in this utility model; Figure 6 This is a schematic diagram of the structure of the pre-filter of this utility model; The components include: 1. Filter housing, 2. Air inlet, 3. Top cover, 4. Air outlet, 5. Ring-shaped adsorption magnet, 6. Filter element, 6-1. Outer primary filter element, 6-2. Inner secondary filter element, 7. Bottom cover, 8. Spiral guide plate, 9. Pre-filter, and 10. Impurity discharge port. Detailed Implementation

[0015] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0016] A device for multi-stage filtration of impurities in compressed air pipelines in tunnels, such as... Figure 1 and Figure 2 As shown, it includes a filter housing 1, which is cylindrical. An air inlet 2 is provided on the side of the filter housing 1 near the bottom. An upper cover 3 is provided on the top of the filter housing 1, and an air outlet 4 is provided at the center of the upper cover 3. The inner wall of the filter housing 1 is provided with an annular adsorption magnet 5. The annular adsorption magnet 5 is cylindrical, and the outer diameter of the annular adsorption magnet 5 is equal to the inner diameter of the filter housing 1. The annular adsorption magnet 5 is located above the air inlet 2. A filter element 6 is disposed above the annular adsorption magnet 5, and the filter element 6 is disposed at the bottom of the upper cover 3.

[0017] This invention utilizes a cylindrical filter housing 1 with a bottom side air inlet 2 and a top center air outlet 4 to ensure smooth upward flow of compressed air along the inner wall of the filter housing 1, significantly reducing airflow resistance and pressure loss. A cylindrical annular magnet 5 perfectly matches the inner diameter of the filter housing 1, fully covering the compressed air flow cross-section. This ensures that the compressed air, upon entering through the air inlet 2, is first fully attracted by the magnet to remove magnetic impurities such as iron filings and rust, improving the removal efficiency of magnetic impurities. The filter element 6 and the annular magnet 5 form a graded purification structure of "first magnetic attraction to remove iron, then filtration to remove impurities," further intercepting non-ferrous particles and providing double protection for the cleanliness of the compressed air. The design of the upper cover 3 not only seals the filter housing 1 but also provides a stable installation base for the filter element 6, resulting in a compact and simple overall structure. This effectively prevents wear and failure of air-using equipment components caused by impurities, extending equipment lifespan and reducing maintenance costs and production downtime frequency.

[0018] like Figure 3 As shown, a lower end cover 7 is provided at the bottom of the filter housing 1, and a spiral guide plate 8 is fixedly connected to the upper surface of the lower end cover 7. The spiral guide plate 8 is a blade-shaped structure that spirals upward from bottom to top. The outer diameter of the spiral guide plate 8 is less than or equal to the inner diameter of the annular adsorption magnet 5, and the top of the spiral guide plate 8 is located close to the top of the annular adsorption magnet 5.

[0019] The lower end cap 7 in this invention not only seals the bottom of the filter housing 1 but also provides a stable mounting carrier for the spiral guide plate 8. The spiral guide plate 8 is adapted to the inner diameter of the annular adsorption magnet 5 and its top is attached to the inner wall of the annular adsorption magnet 5. This guides the compressed air to form a spiral vortex, prolonging the contact time between the compressed air and the annular adsorption magnet 5, allowing ferrous impurities to be fully adsorbed and improving magnetic adsorption efficiency. At the same time, the centrifugal force generated by the vortex can cause some large particles of impurities to settle to the bottom, preventing impurities from directly impacting subsequent filter components. The coaxial installation design of the spiral guide plate 8 ensures uniform airflow without any dead angles, optimizes the compressed air flow path, and improves the overall stability and reliability of filtration and purification.

[0020] like Figure 6 As shown, a pre-filter 9 is provided between the annular adsorption magnet 5 and the filter element 6. The diameter of the pre-filter 9 is equal to the inner diameter of the filter housing 1.

[0021] In this invention, a pre-filter 9 is added between the annular adsorption magnet 5 and the filter element 6. Its diameter is equal to the inner diameter of the filter housing 1. This pre-filter effectively intercepts large particles of impurities remaining in the compressed air after being adsorbed by the magnet, preventing these particles from directly entering the filter element 6 and causing blockage. This protects the filter element 6 and extends its replacement cycle. Simultaneously, the pre-filter 9 shares the filtration pressure of the filter element 6, forming a three-stage purification structure of "magnetic adsorption → pre-filtration → fine filtration." This further improves the purification accuracy of the compressed air, ensuring cleaner output air and meeting the needs of precision air-conditioning equipment. like Figure 4 As shown, the filter element 6 includes an outer primary filter element 6-1 and an inner secondary filter element 6-2 disposed inside the outer primary filter element 6-1. The outer primary filter element 6-1 and the inner secondary filter element 6-2 are coaxially arranged.

[0022] In this utility model, the filter element 6 is composed of two layers of filter screens, which greatly increases the filtration area and filtration levels. It can intercept impurities of different particle sizes separately, realize graded filtration, and significantly improve the compressed air purification accuracy. The coaxial structure ensures that the airflow passes evenly through the two filter elements, avoiding filtration dead zones. At the same time, the dual filter element structure allows one of the filter elements to be replaced individually according to actual usage needs, reducing filter element replacement costs and improving maintenance flexibility.

[0023] Both the outer primary filter element 6-1 and the inner secondary filter element 6-2 are cylindrical. The outer diameter of the outer primary filter element 6-1 is smaller than the inner diameter of the filter housing 1, and the inner diameter of the inner secondary filter element 6-2 is greater than or equal to the diameter of the air outlet 4.

[0024] In this utility model, both the outer primary filter element 6-1 and the inner secondary filter element 6-2 are designed in a cylindrical shape. The outer diameter of the outer primary filter element 6-1 is smaller than the inner diameter of the filter housing 1, and the inner diameter of the inner secondary filter element 6-2 is not smaller than the diameter of the air outlet 2. This size adaptation design can form a reasonable airflow channel between the outer primary filter element 6-1 and the filter housing 1, and between the inner secondary filter element 6-2 and the air outlet 2, avoiding airflow congestion and ensuring ventilation efficiency. At the same time, the cylindrical structure facilitates precise installation with components such as the upper end cover 3 and the pre-filter 9, improving the assembly accuracy and sealing of the overall structure.

[0025] The upper end cover 3, filter element 6, pre-filter 9, spiral guide plate 8, annular adsorption magnet 5 and lower end cover 7 are all coaxially arranged.

[0026] The coaxial design in this invention ensures precise installation and positioning of all core components, avoiding problems such as airflow deviation, uneven filtration, and incomplete magnetic attraction caused by component misalignment. The coaxial structure allows compressed air to flow smoothly along the central axis without obstruction, further reducing pressure loss. At the same time, it makes the fit between components tighter, reduces gap leakage, and prevents unfiltered compressed air from directly entering the air outlet, improving purification effect and structural stability. It also simplifies the assembly process and reduces assembly errors.

[0027] The filter housing 1 has a discharge port 10 on its side near the bottom.

[0028] This utility model provides a discharge port 10 on the bottom side of the filter housing 1, which can conveniently and quickly discharge the impurities and moisture that have settled inside the filter. There is no need to disassemble the entire filter; simply opening the discharge port 10 is sufficient to clean the impurities and moisture, greatly reducing maintenance difficulty and downtime. At the same time, timely discharge can prevent impurities from accumulating inside the filter, prevent impurities from being mixed into the compressed air and affecting the purification effect, keep the inside of the filter clean, and ensure that the filtration and magnetic adsorption functions can be performed stably for a long time.

[0029] The height of the annular magnet 5 is greater than the diameter of the air inlet 2, and several grooves are provided on the inner wall of the annular magnet 5.

[0030] In this invention, the height of the annular adsorption magnet 5 is greater than the diameter of the air inlet 2, which prolongs the contact path and time between the compressed air and the magnet, allowing more time for iron impurities in the compressed air to be adsorbed, thus improving the magnetic adsorption efficiency. The several grooves provided on the inner wall of the annular adsorption magnet 5 not only increase the adsorption surface area of ​​the magnet, but also allow the adsorbed iron impurities to adhere to the grooves, preventing them from being washed away by the airflow.

[0031] The bottom of the upper cover 3 has a mounting groove.

[0032] The design of the mounting groove in this utility model simplifies the assembly process of the filter element 6, facilitates the replacement and cleaning of the filter element 6, and improves the convenience of maintenance.

[0033] The working principle of this utility model is as follows: Gas enters the filter from the air inlet 2, and then rises spirally under the guidance of the spiral guide plate 8. During this process, the contact time with the annular adsorption magnet 5 is increased, so that iron impurities can be fully adsorbed in the groove of the annular adsorption magnet 5 and are not easily carried away by the airflow. When the gas flows through the pre-filter 9, the pre-filter 9 performs preliminary purification of the gas, filtering out larger non-magnetic impurities. After passing through the filter element 6 to filter out smaller non-magnetic impurities, the gas is discharged from the air outlet 4. When the filter needs to be cleaned, the impurity discharge port 10 can be opened to pour out the impurities and water deposited at the bottom. At the same time, the lower end cover 7 and the upper end cover 3 can be opened to clean the spiral guide plate 8, the filter element 6 and the inside of the filter respectively.

[0034] In summary, the filter of this utility model guides the smooth flow of airflow based on a coaxial layout, extends the contact time between the compressed air and the double magnetic attraction structure through spiral airflow guidance, and enhances the adsorption of ferrous impurities by combining the inner wall grooves. It intercepts impurities of multiple particle sizes through a three-stage synergistic mechanism of "magnetic attraction → pre-filtration → double filter element fine filtration". The size-adaptive design optimizes airflow and sealing performance, and the impurity discharge port and installation groove enable convenient maintenance. In principle, it efficiently purifies compressed air, avoids equipment damage and reduces costs.

Claims

1. A device for multi-stage filtration of impurities in compressed air pipelines in roadways, characterized in that, Includes a filter housing (1), which is cylindrical. An air inlet (2) is provided on the side of the filter housing (1) near the bottom. An upper cover (3) is provided on the top of the filter housing (1), and an air outlet (4) is provided at the center of the upper cover (3). The inner wall of the filter housing (1) is provided with an annular adsorption magnet (5). The annular adsorption magnet (5) is cylindrical. The outer diameter of the annular adsorption magnet (5) is equal to the inner diameter of the filter housing (1). The annular adsorption magnet (5) is located above the air inlet (2). A filter element (6) is provided above the annular adsorption magnet (5), and the filter element (6) is located at the bottom of the upper end cover (3).

2. The device for multi-stage filtration of impurities in a roadway compressed air pipeline according to claim 1, characterized in that, The bottom of the filter housing (1) is provided with a lower end cover (7), and a spiral guide plate (8) is fixedly connected to the upper surface of the lower end cover (7). The spiral guide plate (8) is a blade-shaped structure that spirals upward from bottom to top. The outer diameter of the spiral guide plate (8) is less than or equal to the inner diameter of the annular adsorption magnet (5). The top of the spiral guide plate (8) is located close to the top of the annular adsorption magnet (5).

3. The device for multi-stage filtration of impurities in a roadway compressed air pipeline according to claim 2, characterized in that, A pre-filter (9) is provided between the annular adsorption magnet (5) and the filter element (6), and the diameter of the pre-filter (9) is equal to the inner diameter of the filter housing (1).

4. The device for multi-stage filtration of impurities in a roadway compressed air pipeline according to claim 3, characterized in that, The filter element (6) includes an outer primary filter element (6-1) and an inner secondary filter element (6-2) disposed inside the outer primary filter element (6-1), wherein the outer primary filter element (6-1) and the inner secondary filter element (6-2) are coaxially arranged.

5. The device for multi-stage filtration of impurities in a roadway compressed air pipeline according to claim 4, characterized in that, Both the outer primary filter element (6-1) and the inner secondary filter element (6-2) are cylindrical. The outer diameter of the outer primary filter element (6-1) is smaller than the inner diameter of the filter housing (1), and the inner diameter of the inner secondary filter element (6-2) is greater than or equal to the diameter of the air outlet (4).

6. The device for multi-stage filtration of impurities in a roadway compressed air pipeline according to claim 5, characterized in that, The upper end cover (3), filter element (6), pre-filter (9), spiral guide plate (8), annular adsorption magnet (5) and lower end cover (7) are all coaxially arranged.

7. The device for multi-stage filtration of impurities in a roadway compressed air pipeline according to claim 6, characterized in that, The filter housing (1) has a discharge port (10) on the side near the bottom.

8. The device for multi-stage filtration of impurities in a roadway compressed air pipeline according to claim 7, characterized in that, The height of the annular adsorption magnet (5) is greater than the diameter of the air inlet (2), and the inner wall of the annular adsorption magnet (5) is provided with several grooves.

9. The device for multi-stage filtration of impurities in a roadway compressed air pipeline according to claim 8, characterized in that, The bottom of the upper cover (3) has a mounting groove.

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