Fresh air purification system for material drying

Abstract

The utility model belongs to the technical field of chemical production equipment, and discloses a fresh air purification system for drying materials, which comprises a fresh air flow channel with an air inlet and an air outlet. A sand separation assembly is arranged at the air inlet, and a filtering assembly is arranged between the air inlet and the air outlet; fresh air sequentially penetrates through the sand isolating assembly and the filtering assembly to be filtered. Ambient air of a production field is adopted as a fresh air source, the air penetrates through the sand separation assembly to enter the purification system, large-size impurities such as winged insects and gravels carried in the air can be removed, then the air penetrates through the filtering assembly, the air can be filtered again, the impurities carried in the air are greatly reduced, and the air purification effect is improved. And the filtered and purified air is sent to corresponding equipment to serve as fresh air for drying the materials, so that the materials can be prevented from being polluted by impurities in the air. Meanwhile, large-particle impurities can be intercepted by the sand isolating assembly and cannot be in contact with the filtering assembly, so that the service life of the filtering assembly can be prolonged.

Description

Technical Field

[0001] This utility model belongs to the field of chemical production equipment, specifically, it relates to a purification system for fresh air used in material drying. Background Technology

[0002] In the chemical industry, there are processes that require drying raw materials or synthesized products. One existing drying process involves introducing air into the corresponding equipment to contact the material. The flowing air carries away the moisture in the material, thereby achieving the purpose of drying.

[0003] Since the materials are in direct contact with the incoming air, the quality of the air directly affects the quality of the product. Typically, ambient air from the production area is drawn in as the source of fresh air for material drying. However, ambient air often carries impurities such as dust. If this air is sent directly into the drying equipment without treatment, these impurities will be introduced, contaminating the materials and affecting product quality.

[0004] In view of the above, this utility model is hereby proposed. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a purification system for fresh air in material drying, which can effectively remove impurities carried in the fresh air, avoid contaminating the material, and extend the replacement cycle of the filter components.

[0006] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by this utility model is as follows:

[0007] A purification system for fresh air used in material drying includes a fresh air duct with an air inlet and an air outlet; a sand-proof component is provided at the air inlet, and a filter component is provided between the air inlet and the air outlet;

[0008] Air passes through the sand-blocking component and the filter component in sequence to achieve filtration.

[0009] Furthermore, the sand-blocking component includes louvers installed at the air inlet and a sand-proof net covering the outside of the louvers.

[0010] Furthermore, the filter assembly and the sand-blocking assembly have a certain distance between them along the airflow direction.

[0011] Furthermore, the filter assembly comprises the following components arranged sequentially along the airflow direction:

[0012] The first filter layer is spaced apart from the sand-blocking component;

[0013] The second filter layer is disposed at an interval from the first filter layer;

[0014] The third filter layer is spaced apart from the second filter layer.

[0015] Furthermore, the first filter layer, the second filter layer, and the third filter layer each include filter cotton with a certain thickness along the airflow direction.

[0016] Furthermore, the fresh air duct includes an air inlet chamber and an air intake chamber that are interconnected;

[0017] The air inlet is provided on the air inlet chamber, and the filter assembly is disposed in the air inlet chamber;

[0018] Air passes through the sand-proof assembly into the air inlet chamber, passes through the filter assembly in the air inlet chamber, and then enters the air intake chamber.

[0019] Furthermore, the air intake chamber contains water at a certain level to absorb dust from the air.

[0020] Furthermore, a heater is installed in the fresh air duct to heat the air flowing through it.

[0021] Furthermore, the heater is disposed between the filter assembly and the air outlet;

[0022] The fresh air flow channel includes a supply air duct, the inlet end of which is connected to the outlet end of the heater, and the outlet end of the supply air duct forms the outlet of the fresh air flow channel.

[0023] Furthermore, the purification system includes a filter connected to the air outlet, and air that passes through the sand-proof component and the filter component in sequence enters the filter for further filtration.

[0024] By adopting the above technical solution, this utility model has the following beneficial effects compared with the prior art.

[0025] In this invention, the purification system is sequentially equipped with a sand-blocking component and a filter component along the airflow direction. Air first passes through the sand-blocking component, where it intercepts large impurities such as flying insects and sand. It then passes through the filter component, which further filters out smaller impurities. The purified air serves as fresh air for drying materials, effectively preventing material contamination. Furthermore, because large particles are intercepted by the sand-blocking component and do not come into contact with the filter component, the lifespan of the filter component is extended.

[0026] In this invention, the filter assembly and the sand-barrier assembly are spaced apart, which can reduce air resistance and improve filtration efficiency to a certain extent. The filter assembly includes three spaced-apart filter layers, enabling layer-by-layer filtration of air, thus achieving a higher removal rate of impurities in the air. In addition, the gaps between the filter assembly and the sand-barrier assembly, as well as between adjacent filter layers, provide operational space for cleaning or replacing the filter layers.

[0027] In this invention, a certain amount of water is placed inside the air intake chamber to form a dust-settling water seal. Air flows through the space above the liquid surface in the air intake chamber and comes into contact with the liquid surface. The fine dust carried in the air can be adsorbed into the water, thereby further reducing the impurity content in the air, especially the content of fine dust.

[0028] In this invention, by setting a heater, the air can be heated during the process of passing through the purification system, thereby increasing the outlet air temperature. The air discharged from the purification system is hot air heated to a certain temperature and sent into the material drying equipment, which can improve the drying efficiency of the material.

[0029] In this invention, air is filtered by the sand-separating component and the filter component before being sent to the filter for further filtration to remove even finer impurities, significantly improving the cleanliness of the exhaust air and preventing contamination of dry materials. Simultaneously, because the air passes through the sand-separating component and the filter component before reaching the filter, the filter will not come into contact with larger impurities, extending the service life of the filter media and reducing the frequency of cleaning or replacement.

[0030] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings. Attached Figure Description

[0031] The accompanying drawings, as part of this utility model, are used to provide a further understanding of the present utility model. The illustrative embodiments and descriptions of the present utility model are used to explain the present utility model, but do not constitute an undue limitation of the present utility model. Obviously, the drawings described below are merely some embodiments; those skilled in the art can obtain other drawings based on these drawings without creative effort. In the drawings:

[0032] Figure 1 This is an exploded view of the structure of the fresh air purification system for material drying in this utility model.

[0033] In the diagram: 100, Fresh air duct; 101, Air inlet; 102, Air outlet; 110, Air intake chamber; 120, Suction chamber; 121, Dust settling water seal; 122, Air window; 130, Supply air duct; 200, Filter; 300, Sand barrier assembly; 310, Louver; 320, Sandproof net; 400, Filter assembly; 410, First filter layer; 420, Second filter layer; 430, Third filter layer; 500, Heater.

[0034] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the present invention in any way, but rather to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0036] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0037] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0038] like Figure 1 As shown, an embodiment of this utility model provides a purification system for fresh air used in material drying. Specifically, the purification system can draw in outside air and intercept impurities carried by the air as it passes through the system, thereby obtaining clean fresh air that is essentially free of impurities. The fresh air discharged from the purification system can be delivered to the material drying equipment for drying the material.

[0039] In this embodiment, the purification system includes a fresh air duct 100 with an air inlet 101 and an air outlet 102. A sand-filtering component 300 is provided at the air inlet 101, and a filter component 400 is provided between the air inlet 101 and the air outlet 102. When the purification system is in operation, external air passes sequentially through the sand-filtering component 300 and the filter component 400, thereby achieving air filtration.

[0040] In one specific implementation, a fan (not shown in the figure) is provided in the area near the end of the fresh air flow duct 100. The fan generates negative pressure within the fresh air flow duct 100, thereby drawing outside air into the fresh air flow duct 100 through the air inlet 101. More specifically, the outside air passes through the sand-proof assembly 300, enters the fresh air flow duct 100 through the air inlet 101, flows along the fresh air flow duct 100, passes through the filter assembly 400, and is finally discharged through the air outlet 102.

[0041] In the above scheme, ambient air from the production site is directly used as the source of fresh air. The air first passes through the sand-blocking component 300, where large impurities such as flying insects and sand are intercepted. Then, it passes through the filter component 400 inside the fresh air flow channel 100, achieving a second filtration effect. This significantly reduces the impurities carried in the air, allowing the filtered and purified air to be used as fresh air for drying materials, thus avoiding the problem of materials being contaminated by impurities in the air.

[0042] On the other hand, the filtration accuracy of filter component 400 is higher than that of sand-separating component 300. Large impurities are intercepted by sand-separating component 300 and do not come into contact with filter component 400, while filter component 400 mainly intercepts relatively small impurities. This helps to extend the service life of filter component 400, avoids the trouble of frequently cleaning or replacing filter component 400, and saves labor costs.

[0043] Furthermore, the purification system of this embodiment has a filter 200 connected to the air outlet 102 of the fresh air duct 100. Air that passes sequentially through the sand-absorbing assembly 300 and the filter assembly 400 in the fresh air duct 100 is sent into the filter 200 for further filtration. In this way, even finer impurities in the air can be collected in the filter 200, significantly improving the cleanliness of the air. The air discharged from the filter 200 can be directly delivered to the material drying equipment, serving as fresh air for drying the materials and coming into direct contact with them without contaminating the materials due to impurities carried in the fresh air.

[0044] In one specific embodiment, the filter 200 includes a three-stage filtration device, specifically comprising a pre-filter, a medium-efficiency filter, and a high-efficiency filter arranged sequentially along the airflow direction. The filtration accuracy of the pre-filter, medium-efficiency filter, and high-efficiency filter increases sequentially, and the filtration accuracy of the pre-filter is higher than that of the filter assembly 400.

[0045] The air, after initial filtration by the sand-separating component 300 and the filter component 400, undergoes a three-stage filtration process—pre-filter, medium-efficiency filter, and high-efficiency filter—at the filter 200. This more thoroughly removes any impurities that may be carried in the air, preventing contamination of the dried materials. Before entering the filter 200, the air has already had some impurities removed by the sand-separating component 300 and the filter component 400. The filter 200 only collects small-sized impurities, preventing larger impurities from entering and quickly clogging the filter media. This extends the lifespan of the filter media in the filter 200 and reduces the frequency of manual cleaning or replacement.

[0046] In a further embodiment, the sand-blocking component 300 includes louvers 310 and a sand-proof net 320. The louvers 310 are installed on the air inlet 101, and the sand-proof net 320 covers and is disposed on the outside of the louvers 310. The louvers 310 provide some support for the sand-proof net 320, which effectively intercepts large-sized impurities such as flying insects and sand from the outside, preventing these impurities from entering the fresh air duct 100.

[0047] In the above solution, the sand-proof net 320 is placed on the outside of the louver 310. This allows impurities to be intercepted on the outermost side of the sand-blocking component 300, and the intercepted impurities can fall directly onto the outside ground. However, if the sand-proof net 320 is placed on the inside of the louver 310, although it can also achieve the purpose of intercepting impurities, some impurities may fall into the gap between the louver 310 and the sand-proof net 320, making cleaning more troublesome.

[0048] In a further embodiment, the filter assembly 400 and the sand-barrier assembly 300 are spaced apart along the airflow direction. That is, after the air passes through the sand-barrier assembly 300, it can enter a buffer space of a certain size before coming into contact with the filter assembly 400.

[0049] The aforementioned structure allows air to pass through the filter assembly 400 in a more even distribution, reducing air resistance and improving filtration efficiency. Furthermore, the space between the filter assembly 400 and the sand-proof assembly 300 provides operational space for manual replacement or cleaning of the filter assembly 400.

[0050] In a further embodiment, the filter assembly 400 includes a first filter layer 410, a second filter layer 420, and a third filter layer 430 arranged sequentially along the airflow direction. The first filter layer 410 is spaced apart from the sand-blocking assembly 300, the second filter layer 420 is spaced apart from the first filter layer 410, and the third filter layer 430 is spaced apart from the second filter layer 420.

[0051] In one specific embodiment, the filtration accuracy of the first filter layer 410 is higher than that of the sand-proof net 320, the filtration accuracy of the second filter layer 420 is not lower than that of the first filter layer 410, and the filtration accuracy of the third filter layer 430 is not lower than that of the second filter layer 420.

[0052] In the preferred embodiment, the filtration accuracy of the first filter layer 410, the second filter layer 420, and the third filter layer 430 increases sequentially.

[0053] In the above scheme, the filter assembly 400 includes three filter layers arranged at intervals in sequence, filtering the passing air layer by layer. This results in higher interception efficiency for impurities in the air and also helps to extend the service life of each filter layer. The intervals between the filter layers allow air to be buffered between adjacent filter layers, enabling it to pass through the filter layer's coverage area more evenly, preventing impurities from concentrating in localized areas of the filter layer, and reducing air resistance as it passes through the filter layer.

[0054] Because the filter layer will become clogged with impurities after long-term use and needs to be manually cleaned or replaced, there is a gap between adjacent filter layers, which also provides operating space for cleaning and replacement of the filter layer.

[0055] In one specific embodiment of this example, the sand-blocking component 300, the first filter layer 410, the second filter layer 420, and the third filter layer 430 are arranged in a substantially parallel manner, with their arrangement direction substantially perpendicular to the airflow direction. More specifically, the spacing between the sand-blocking component 300 and the first filter layer 410, and the spacing between any two adjacent filter layers in the first filter layer 410, the second filter layer 420, and the third filter layer 430, are three to six meters, respectively.

[0056] As a specific embodiment, the first filter layer 410, the second filter layer 420, and the third filter layer 430 each include filter cotton with a certain thickness along the airflow direction. More specifically, in this embodiment, the first filter layer 410, the second filter layer 420, and the third filter layer 430 are each formed of non-woven filter cotton.

[0057] In a further embodiment, the fresh air duct 100 includes an air inlet chamber 110 and an air intake chamber 120 that are interconnected, wherein the air intake chamber 120 is located downstream of the air inlet chamber 110 along the air flow direction. An air inlet 101 is located on the side wall of the air inlet chamber 110, and a filter assembly 400 is located inside the air inlet chamber 110.

[0058] When the purification system is working, outside air passes through the sand-blocking component 300 at the air inlet 101 and enters the air inlet chamber 110. Inside the air inlet chamber 110, it passes through the filter component 400 and then enters the air intake chamber 120.

[0059] In one specific embodiment, the air inlet chamber 110 and the air intake chamber 120 each have a certain length along the airflow direction. One end of the air inlet chamber 110 is provided with an air inlet 101, and the other end is connected to the air intake chamber 120. The end of the air intake chamber 120 near the air inlet chamber 110 has an air vent 122, and the air inlet chamber 110 and the air intake chamber 120 are connected through the air vent 122. The third filter layer 430 is disposed at the location of the air vent 122.

[0060] It should be noted that, Figure 1 In order to show the structure of the air inlet chamber 110 and the air intake chamber 120 more clearly, the connection between the two is shown separately. However, in the actual design, the left end of the air inlet chamber 110 and the right end of the air intake chamber 120 are directly connected. That is, the position of the third filter cotton 430 and the air window 122 basically coincides.

[0061] In one specific structure, the areas of the louvers 310 and the sand screen 320 are basically the same as the opening area of ​​the air inlet 101, and the opening area of ​​the air inlet 101 is also basically the same as the end wall area of ​​the air inlet chamber 110 away from the suction chamber 120. The areas of the first filter layer 410, the second filter layer 420, and the third filter layer 430 are basically the same as the cross-sectional area of ​​the air inlet chamber 110, maximizing the filtration area and improving the filtration capacity. The outer periphery of the air vent 122 is close to the side wall of the suction chamber 120, maximizing the opening area of ​​the air vent 122.

[0062] By maximizing the opening area of ​​the air inlet 101 and the vent 122, the suction area is increased. With the working power of the fan at the end of the fresh air duct 100 remaining basically unchanged, the negative pressure generated in the air inlet chamber 110 and the suction chamber 120 can be reduced, which helps to reduce the problem of external dust entering the suction chamber 120 due to excessive negative pressure.

[0063] In one specific embodiment, the purification system can be modified from the existing structure at the production site.

[0064] Specifically, existing devices for filtering air to form fresh air for material drying include an air intake chamber 120, with filter cotton covering the air vent 122 of the air intake chamber 120. In this embodiment, an air inlet chamber 110 is added to the front end of the air intake chamber 120 to provide installation space for installing a multi-layer filter cotton structure. Simultaneously, a sand-proof net 320, capable of intercepting large-sized impurities, is added to the air inlet 101 of the air inlet chamber 110. Through the structural cooperation of the sand-proof net 320 and the multi-layer filter cotton, preliminary filtration is performed before the air enters the filter 200, reducing the entry of larger-sized impurities into the filter 200 and extending the service life of the filter consumables in the filter 200.

[0065] In a further embodiment, water with a certain liquid level is placed in the air intake chamber 120 to form a dust-absorbing water seal 121 that can adsorb dust in the air.

[0066] Specifically, the air entering the suction chamber 120 passes through the space above the liquid surface and comes into contact with the liquid surface. The fine dust carried in the air can be adsorbed into the water, so that some of the fine dust that can pass through the filter assembly 400 can be intercepted in the suction chamber 120, further reducing the amount of dust entering the filter 200, thereby further extending the service life of the filter consumables in the filter 200.

[0067] In one specific implementation, the end wall of the air intake chamber 120 has a water baffle (not shown in the figure) of a certain height below the air window 122. The liquid level of the dust settling water seal 121 is not higher than the water baffle, ensuring that water will not overflow into the air intake chamber 110 and preventing the filter cotton, which serves as the filter layer, from being soaked by water.

[0068] In a more specific structure, the suction chamber 120 is equipped with a water inlet for connecting an external water source to inject water into the suction chamber 120 to form a dust settling water seal 121. The floor of the suction chamber 120 is equipped with a drain outlet for draining water outwards. The drain outlet can be opened periodically to drain the water that has absorbed a lot of dust, and then replace it with cleaner water to form the dust settling water seal 121.

[0069] To improve the efficiency of material drying, the fresh air supplied to the drying equipment is usually hot air with a certain temperature. Therefore, in a further embodiment, a heater 500 is installed in the fresh air duct 100 to heat the flowing air, thereby increasing the outlet air temperature of the purification system.

[0070] In one specific embodiment, the heater 500 is a heat exchanger that uses steam as the heat exchange medium. When the purification system is working, high-temperature steam is continuously introduced into the heater 500, and the air is heated by exchanging heat with the steam as it passes through the heater 500.

[0071] Furthermore, the heater 500 is positioned between the filter assembly 400 and the air outlet 102. After the outside air is filtered by the sand-proof assembly 300 and the filter assembly 400, it enters the area where the heater 500 is located, which can prevent dust or other impurities in the air from remaining in the heater 500.

[0072] In one specific implementation, the fresh air duct 100 includes a supply air duct 130, the inlet end of which is connected to the outlet end of the heater 500, and the outlet end of the supply air duct 130 forms the outlet 102 of the fresh air duct 100.

[0073] More specifically, the heater 500 is disposed between the air intake chamber 120 and the air supply duct 130, and the air inlet of the heater 500 is connected to the air intake chamber 120. In one specific structure, a baffle plate of a certain height is also provided at the bottom of the air intake chamber 120 on the side near the heater 500 to prevent water from overflowing and contacting the heater 500.

[0074] In one specific embodiment, the side wall of the suction chamber 120 is provided with an openable and closable door, so that operators can enter the suction chamber 120 for maintenance or other operations when necessary. A baffle plate is also provided at the bottom of the door to prevent water from overflowing at the door location.

[0075] In the above-described scheme of this embodiment, the air vent 122 is located on the right end wall of the air intake chamber 120, and the air inlet chamber 110, air intake chamber 120, heater 500, and air supply duct 130 are arranged basically along the same straight line. The air outlet 102 at the right end of the air supply duct 130 is connected to the filter 200 through an air delivery pipeline, thereby sending the pre-filtered and heated air into the filter 200 for further filtration.

[0076] Specifically, the direction of air flow is as follows Figure 1 As indicated by the arrows, outside air first passes through the sand-proof net 320, intercepting large impurities, and then passes through the louvers 310 into the air inlet 101 into the air inlet chamber 110. The air continues to flow to the left within the air inlet chamber 110, passing sequentially through the first filter layer 410, the second filter layer 420, and the third filter layer 430, further removing smaller impurities. The air passing through the third filter layer 430 enters the suction chamber 120 through the air vent 122, where the dust-collecting water seal 121 at the bottom of the suction chamber 120 adsorbs and removes even finer dust particles. It then enters the heater 500's designated area and is heated to a certain temperature. The heated air flows along the air supply duct 130, exits through the air outlet 102, and is then sent to the filter 200 for further filtration with greater precision, resulting in essentially impurity-free hot air. This hot air can be supplied to drying equipment as fresh air for drying materials, directly contacting the materials without causing contamination.

[0077] In another specific embodiment of this invention, the air vent can also be located on the front or rear side wall of the air intake chamber, so that the airflow direction within the air intake chamber is substantially perpendicular to the airflow direction from the air intake chamber to the air supply duct. With the above structure, the air inlet is located on the side of the air intake chamber opposite to the air vent of the air intake chamber, and the first, second, and third filter layers are all arranged parallel to the front side wall of the air intake chamber.

[0078] In another specific embodiment of this invention, air vents can be opened on the right end wall, front side wall, and rear side wall of the air intake chamber, and each air vent corresponds to an air inlet chamber. That is, the air intake chamber is connected to three air inlet chambers simultaneously, and the entire purification system draws in air through three air inlets at the same time. In this way, the air intake area can be further increased and the negative pressure inside the system can be reduced.

[0079] It is understood that the purification system provided in this embodiment may, depending on actual needs and the actual space conditions of the production site, have air vents opened on only two of the right end wall, front side wall, and rear side wall of the suction chamber, and these vents will be connected to the corresponding air inlet chambers. That is, one suction chamber is connected to two air inlet chambers simultaneously, and the purification system receives air from two air inlets at the same time.

[0080] The purification system for fresh air used in material drying provided in this embodiment has a sand-blocking component 300 and a filter component 400 arranged sequentially in the airflow direction at the front end of the filter 200. Through the preliminary filtration of external air by the sand-blocking component 300 and the filter component 400, dust and other impurities can be reduced from entering the filter 200, effectively extending the service life of the filter consumables inside the filter 200, reducing the frequency of manual cleaning or replacement, and saving labor costs.

[0081] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A purification system for fresh air used in material drying, characterized in that, It includes a fresh air duct with an air inlet and an air outlet; a sand-proof component is provided at the air inlet, and a filter component is provided between the air inlet and the air outlet; air passes through the sand-proof component and the filter component in sequence to achieve filtration treatment; The sand-blocking component includes louvers installed at the air inlet and a sand-proof net covering the outside of the louvers; the filter component includes a first filter layer, a second filter layer and a third filter layer arranged sequentially and spaced apart along the airflow direction, and the first filter layer and the sand-blocking component have a certain distance between them along the airflow direction. The fresh air duct includes an air inlet chamber and an air intake chamber that are interconnected. Along the air flow direction, the air intake chamber is located downstream of the air inlet chamber, and the filter assembly is located inside the air inlet chamber. Air passes through the filter assembly in the air inlet chamber and then enters the air intake chamber. The air intake chamber contains water at a certain liquid level to form a dust settling water seal for adsorbing dust in the air.

2. The purification system for fresh air used in material drying according to claim 1, characterized in that, The distance between the first filter layer and the sand-blocking component, and the distance between two adjacent filter layers in the first, second and third filter layers are three to six meters, respectively.

3. The purification system for fresh air used in material drying according to claim 2, characterized in that, The first filter layer, the second filter layer and the third filter layer each include filter cotton with a certain thickness along the airflow direction; The filtration accuracy of the first filter layer is higher than that of the sand-proof net, the filtration accuracy of the second filter layer is not lower than that of the first filter layer, and the filtration accuracy of the third filter layer is not lower than that of the second filter layer.

4. The purification system for fresh air used in material drying according to any one of claims 1-3, characterized in that, The air inlet is provided on the air inlet chamber, and air enters the air inlet chamber through the sand-proof component; The air intake chamber has a vent at one end near the air inlet chamber, and the air inlet chamber and the air intake chamber are connected through the vent. The third filter layer is disposed at the location of the vent.

5. The purification system for fresh air used in material drying according to any one of claims 1-3, characterized in that, A heater is installed in the fresh air duct to heat the air flowing through it.

6. The purification system for fresh air used in material drying according to claim 5, characterized in that, The heater is disposed between the filter assembly and the air outlet; The fresh air flow channel includes a supply air duct, the inlet end of which is connected to the outlet end of the heater, and the outlet end of the supply air duct forms the outlet of the fresh air flow channel.

7. The purification system for fresh air used in material drying according to any one of claims 1-3, characterized in that, The purification system includes a filter connected to the air outlet. Air that passes through the sand-proof component and the filter component in sequence enters the filter for further filtration.

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