CN218221693U - Unpowered salt fog filter equipment - Google Patents

Abstract

The utility model discloses an unpowered salt spray filtering device, which relates to the technical field of salt spray filtering and comprises a shell, a water tray component arranged at the lower end of the shell, and a water blocking module, an ultramicro filter screen, a tension structure net, a first filter and a second filter which are sequentially arranged inside the shell; one end of the shell is provided with an air inlet, the other end of the shell is provided with an air outlet, the ultramicro filter screen comprises a plurality of filter screen layers which are stacked, and the meshes of the filter screen layers are staggered; the apertures of the mesh openings of the tension structure mesh are larger than the apertures of the mesh openings of the ultra-micro filter screen to reduce the flow rate of fluid passing through the ultra-micro filter screen while flowing through the tension structure mesh. The defects that a large amount of fresh water is needed and dehumidification power consumption is consumed due to adoption of wet-type salt mist removal are overcome; the effects of water saving and energy saving can be achieved, the problem that dry-type salt mist removal is carried out only by using a physical filter to remove salt mist, hardening failure is easy, and frequent replacement is needed is solved, the use amount of the physical filter is reduced, and the maintenance cost is saved for a user.

Description

Unpowered salt fog filter equipment

Technical Field

The utility model relates to salt fog filters technical field, especially involves an unpowered salt fog filter equipment.

Background

Under high salt fog conditions at or near sea, the plant mainly causes three adverse effects: electrochemical corrosion, accelerated stress corrosion and corrosion of acid/base solutions formed after ionization of salts in water are generated; damage to electronic equipment, corrosion of insulating materials and metals due to salt deposition; blocking or sticking of moving parts of mechanical parts and assemblies, blistering of paint layers caused by electrolytic action, etc.

The salt mist filtering devices on the market at present basically have two forms, one is a wet salt mist filtering device which passes through spray water, the other is a dry salt mist filtering device which adopts a physical filter, or the combination of the two. The wet salt mist filtering device is usually used for treating the humidity of airflow through a dehumidifier after wet treatment, so that the reduction of salt mist prevention grade caused by the increase of the humidity is avoided, a large amount of fresh water is consumed, and the wet salt mist filtering device belongs to a water and energy consumption product and can not be used on seasides and offshore platforms. The dry salt mist filtering device adopting the physical filter needs to frequently replace the physical filter, increases the labor cost for replacement and the solid waste treatment cost, and is easy to damp and agglomerate due to salt attached to the physical filter in humid weather, so that the physical filter is blocked, and the machine is stopped.

In some occasions, because all exhaust fans are in the places where the equipment is located or more power is inconvenient to increase, a salt mist removing device which can ventilate and remove salt mist without power needs to be provided.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an unpowered salt fog filter equipment for solve above-mentioned technical problem.

The utility model adopts the technical scheme as follows:

an unpowered salt mist filtering device comprises a shell, a water tray assembly arranged at the lower end of the shell, and a water blocking module, an ultramicro filter screen, a tension structure net, a first filter and a second filter which are sequentially arranged in the shell;

the first filter is a membrane structure filter, and the second filter is a medium-efficiency filter or a high-efficiency filter;

an air inlet is formed in one end of the shell, an air outlet is formed in the other end of the shell, the water blocking module is arranged close to the air inlet, and the second filter is arranged close to the air outlet;

the ultramicro filter screen comprises a plurality of filter screen layers which are stacked, and meshes of each filter screen layer are arranged in a staggered mode;

the pore size of the mesh of the tension structure net is larger than that of the mesh of the ultra-micro filter screen so as to reduce the flow velocity of the fluid passing through the ultra-micro filter screen when flowing through the tension structure net;

the water disc assembly is communicated with the shell and is right opposite to the water blocking module, the ultramicro filter screen, the tension structure net and the first filter.

Preferably, each of the filter layers includes: first and second screen filaments arranged to cross each other;

wherein each of said first screen filaments and at least one of said second screen filaments intersect to form an intersection;

wherein, the meshes of the filter screen layer are enclosed between every two adjacent first filter screen filaments and two adjacent second filter screen filaments;

the mesh of one of the screen layers is aligned with the intersection of the other of the screen layers.

Preferably, the shape of the air inlet is consistent with that of the water blocking module, and the shape of the air outlet is consistent with that of the medium-efficiency filter or the high-efficiency filter.

Preferably, the outer peripheral wall of the water blocking module is in sealing fit with the inner peripheral wall of the air inlet;

the outer peripheral wall of the middle-effect or high-efficiency filter is in sealing fit with the inner peripheral wall of the air outlet.

Preferably, a certain interval is arranged between the ultramicro filter screen and the water blocking module;

the tension structure net is closely contacted with one side of the ultramicro filter screen far away from the water blocking module;

certain intervals are arranged between the tension structure net and the membrane structure filter, between the membrane structure filter and the middle-effect filter or the high-effect filter, or the tension structure net and the membrane structure filter, and between the membrane structure filter and the middle-effect filter or the high-effect filter are in mutual close contact.

Preferably, the aperture of the meshes of each filter screen layer is less than 0.1mm;

the aperture of the mesh of the tension structure net is 3-10 times of that of the ultra-micro filter screen.

Preferably, the water blocking module, the ultramicro filter screen and the tension structure screen are all made of hydrophilic materials or materials with hydrophilic coatings;

the membrane structure filter is made of water-absorbing materials.

Preferably, the water tray assembly comprises a water tray shell and a drawer which is arranged in the water tray shell in a drawing mode;

an overflow port is arranged at the upper end of one side of the water tray shell and is positioned at the upper side of the drawer;

the height of the inner wall of the lower side of the overflow port is the same as that of the upper surface of the drawer.

Preferably, the ultramicro filter screen, the tension structure screen and the membrane structure filter are detachably arranged in the shell;

the ultramicro filter screen, the tension structure net and the membrane structure filter are respectively connected with the inner wall of the shell in a clamping manner.

An unpowered salt mist filtering device comprises a shell, a water tray assembly arranged at the lower end of the shell, and a water blocking module, an ultramicro filter screen, a tension structure net, a first filter and a second filter which are sequentially arranged in the shell, wherein the first filter is a membrane structure filter, the second filter is a medium-efficiency filter or a high-efficiency filter,

the water-blocking module has walls with hydrophilic properties for blocking large saline droplets in the fluid;

the ultramicro filter screen is provided with hydrophilic filter screen filaments, and the filter screen filaments of the ultramicro filter screen can make liquid spread along the ultramicro filter screen and fall into the water tray component due to gravity;

the tension structure net has hydrophilicity, and the pore diameter of the mesh of the tension structure net is larger than that of the mesh of the ultra-micro filter screen so as to reduce the flow velocity of fluid passing through the ultra-micro filter screen when flowing through the tension structure net;

the first filter is used for absorbing mist water drops containing salt and precipitating the salt in the mist water drops on the first filter;

the second filter is for blocking salt particles in the fluid from escaping from the first filter due to weathering.

The use method of the unpowered salt mist filtering device comprises a shell, a water tray assembly arranged at the lower end of the shell, and a water blocking module, an ultramicro filter screen, a tension structure screen, a first filter and a second filter which are sequentially arranged in the shell, wherein the first filter is a membrane structure filter, the second filter is a medium-efficiency filter or a high-efficiency filter, and the method comprises the following steps:

fluid passes through the air inlet of the shell, sequentially passes through the water blocking module, the ultramicro filter screen, the tension structure net, the first filter and the second filter, and enters the room through the air outlet of the shell;

large saline droplets in the fluid are blocked by the hydrophilic walls of the water-blocking module and enter the underlying water tray assembly by gravity;

the droplets in the fluid contact with and spread along the hydrophilic screen filaments of the ultra-micro screen and enter the water tray assembly below due to gravity;

the pore diameter of the mesh of the tension structure net with hydrophilicity is larger than that of the mesh of the ultra-micro filter screen, the flow speed of partial water drops in the fluid is reduced when the partial water drops pass through the tension structure net, and the partial water drops in the fluid are captured by the tension structure net due to tension and enter the water tray component positioned below due to gravity;

mist water droplets containing salts in the fluid contact the first filter, are absorbed and spread out, and evaporate to follow the fluid away, the salts in the mist water droplets precipitating on the first filter;

salt particles in the fluid escaping from the first filter due to weathering are blocked by the second filter.

As a further preference, after the unpowered salt fog filtering device operates for a preset time, salt hardened or scaled on the first filter is cleaned.

As a further preference, the pressure difference across the second filter is monitored and the second filter is replaced when the pressure difference exceeds a preset range.

The technical scheme has the following advantages or beneficial effects:

(1) The utility model solves the disadvantages of the adoption of wet type salt fog removal, the need of a large amount of fresh water and the power consumption of dehumidification; the effects of water and energy saving can be achieved;

(2) The utility model discloses in, solved the dry-type and removed salt fog with physical filter alone, the easy problem that frequently changes that hardens the inefficacy needs. The use amount of the physical filter is greatly reduced, and the maintenance cost is saved for a user;

(3) The salt mist filtering device can block most of water mist from entering, greatly reduces the humidity of entering air flow, correspondingly improves the salt mist prevention grade, does not need to arrange a dehumidifier indoors, and is simple and energy-saving;

(4) The utility model discloses in, adopted unpowered setting, the installation does not take up an area of, can directly imbed the wall body, need not the power supply, and easy to assemble greatly is maintained with the use.

Drawings

FIG. 1 is a schematic view of the internal structure of the unpowered salt fog filtering device of the present invention;

fig. 2 is a schematic structural diagram of the working state of the unpowered salt fog filtering device of the present invention.

In the figure: 1. a housing; 2. a water blocking module; 3. an ultramicro filter screen; 4. a network of tensile structures; 5. a first filter; 6. a second filter; 7. an air inlet; 8. an air outlet; 9. a water tray assembly; 91. a water tray housing; 92. a drawer; 93. an overflow port.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that, as the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the indicated orientation or positional relationship thereof is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, but does not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" as appearing herein are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" should be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

FIG. 1 is a schematic view of the internal structure of the unpowered salt fog filtering device of the present invention; fig. 2 is a schematic structural diagram of the operation state of the unpowered salt mist filtering device of the present invention, please refer to fig. 1 to 2, which illustrate two preferred embodiments.

Example one

An unpowered salt mist filtering device comprises a shell 1, a water tray assembly 9 arranged at the lower end of the shell 1, a water blocking module 2, an ultramicro filter screen 3, a tension structure net 4, a first filter 5 and a second filter 6 which are sequentially arranged in the shell 1;

the first filter 5 is a membrane structure filter, and the second filter 6 is a medium-efficiency filter or a high-efficiency filter;

an air inlet 7 is formed in one end of the shell 1, an air outlet 8 is formed in the other end of the shell 1, the water blocking module 2 is arranged close to the air inlet 7, and the second filter 6 is arranged close to the air outlet 8;

the ultramicro filter screen 3 comprises a plurality of filter screen layers which are stacked, and the meshes of each filter screen layer are staggered;

the aperture of the mesh of the tension structure net 4 is larger than that of the mesh of the ultra-micro filter screen 3, so as to reduce the flow velocity of the fluid passing through the ultra-micro filter screen 3 when flowing through the tension structure net 4;

the water disc component 9 is communicated with the shell 1 and is just opposite to the water blocking module 2, the ultra-micro filter screen 3, the tension structure net 4 and the first filter 5. When the salt mist water-saving device is used, salt mist airflow sequentially passes through the air inlet 7, the water blocking module 2, the ultra-micro filter screen 3, the tension structural net 4, the first filter 5 (a membrane structure filter), the second filter 6 (a middle-effect filter or a high-efficiency filter) and the air outlet 8, large salt-containing water drops in salt mist fluid can be blocked by the water blocking module 2, small salt-containing water drops can be blocked by the ultra-micro filter screen 3, when water drops on the ultra-micro filter screen 3 are blown out due to high air speed, the blown water drops can reach the tension structural net 4, due to the fact that the air speed is greatly reduced, the water drops falling on the tension structural net 4 cannot be easily blown out due to the hydrophilic filter screen filaments of the tension structural net 4 and the tension of the water drops, and the water drops flow downwards along the hydrophilic filter screen filaments of the tension structural net 4 according to the gravity and finally are gathered to the water disc assembly 9. The membrane structure filter can realize the separation of salt and water, and the medium-efficiency filter or the high-efficiency filter mainly plays a role in blocking few salt particles which escape from the membrane structure filter due to weathering. Wherein, the water drops on the water blocking module 2 and the ultramicro-force structure net can enter the water disc component 9 under the action of self gravity and are collected by the water disc component 9 uniformly.

In this embodiment, the inertia principle is mainly used to separate the large water droplets, and then the hydrophilic filter screen filaments in the material and the hydrophilic filter screen filaments in the ultra-micro filter screen 3, the hydrophilic filter screen filaments in the tension structure screen 4, and the water droplet tension are used to separate the salt mist in the air flow, and finally the middle-effect filter or the high-efficiency filter is used as the final guarantee to solve the problem of salt mist filtration. The problem that salt fog is removed by a physical filter only, hardening is easy, failure is caused, and the physical filter needs to be replaced frequently is solved, and the using amount of the physical filter is greatly reduced. Meanwhile, as the water mist is blocked well, the humidity of the inlet air is greatly reduced, and the protection level of the salt mist is correspondingly provided.

In this embodiment, the water blocking module 2 is a water blocking device, which blocks large water droplets containing salt by inertia, attaches to the wall of the water blocking device according to the hydrophilic property of the wall of the water blocking device, flows downward under the action of gravity, and finally converges to the water disc assembly 9.

Further, as a preferred embodiment, each of the filter layers includes: first and second screen filaments arranged to cross each other;

wherein each first screen filament crosses at least one second screen filament to form a crossover point;

wherein, the meshes of the filter screen layer are enclosed between every two adjacent first filter screen filaments and two adjacent second filter screen filaments;

the mesh of one screen layer is aligned with the intersection of the other screen layer. In this embodiment, the meshes of two adjacent filter layers are staggered, that is, the mesh of the previous filter layer is arranged opposite to the intersection of the next filter layer, which is convenient for the tiny fog drops containing salt fog to spread on the filter layers and enter the water tray assembly 9 under the action of self gravity.

Further, as a preferred embodiment, the shape of the air inlet 7 is consistent with the shape of the water blocking module 2, and the shape of the air outlet 8 is consistent with the shape of the medium-efficiency filter or the high-efficiency filter.

Further, as a preferred embodiment, the outer peripheral wall of the water blocking module 2 is in sealing fit with the inner peripheral wall of the air inlet 7;

the outer peripheral wall of the medium-efficiency or high-efficiency filter is in sealing fit with the inner peripheral wall of the air outlet 8. The water blocking module 2 is in sealing fit with the inner wall of the air inlet 7, so that large water drops containing salt can be prevented from permeating into the ultramicro filter screen 3 from the space between the water blocking module 2 and the inner peripheral wall of the air inlet 7. In this embodiment, the outer walls of the water blocking module 2 and the medium-efficiency filter or the high-efficiency filter have certain elasticity, the water blocking module 2 can be installed in the air inlet 7 in a forced pressing mode, the medium-efficiency filter or the high-efficiency filter is installed in the air outlet 8, then sealing strips are arranged on the periphery of the medium-efficiency or the high-efficiency filter and the periphery of the water blocking module 2, and sealing matching of the water blocking module 2 and the air inlet 7 and sealing matching of the medium-efficiency or the high-efficiency filter and the air outlet 8 are achieved. Referring to fig. 1, the inner peripheral wall of the air inlet 7 refers to the inner peripheral wall of one end of the housing 1, and the inner peripheral wall of the air outlet 8 refers to the inner peripheral wall of the other end of the housing 1.

Further, as a preferred embodiment, a certain interval is arranged between the ultramicro filter screen 3 and the water blocking module 2;

the tension structure net 4 is closely contacted with one side of the ultramicro filter screen 3 far away from the water blocking module 2;

certain intervals are arranged between the tension structure net 4 and the membrane structure filter, between the membrane structure filter and the middle-effect filter or the high-effect filter, or the tension structure net 4 and the membrane structure filter, and between the membrane structure filter and the middle-effect filter or the high-effect filter are in mutual close contact. In this embodiment, as shown in fig. 1, the water blocking module 2 is widened, so that the stroke of the airflow in the water blocking module 2 can be increased, and the large water drops containing salt in the airflow can be effectively blocked. The water-blocking module 2 itself is made of a hydrophilic material, so that large water droplets that are blocked off will adhere to the water-blocking module 2 and automatically enter the drawer 92 in the water tray under the influence of the gravity of the water droplets themselves. And the unfiltered micro fog drops pass through the water blocking module 2 and enter the ultra-fine filter screen 3.

Further, as a preferred embodiment, the aperture of the mesh of each filter screen layer is less than 0.1mm;

the aperture of the mesh of the tension structure net 4 is 3-10 times of that of the ultra-micro filter net 3. In this embodiment, the mesh of the mesh layer is a small mesh, and the mesh of the tension structure net 4 is a large mesh, which is larger than the mesh of the ultra-fine filter net 3, so that the speed of the fluid flowing through the tension structure net 4 is reduced. When the water drops on the ultra-micro filter screen 3 are blown out of the ultra-micro filter screen 3 due to high wind speed and reach the tension structure net 4, the wind speed is reduced, the water drops falling on the tension structure net 4 are not easily blown out due to the tension of the hydrophilic filter screen filaments and the water drops in the tension structure net 4, and the water drops flow downwards along the hydrophilic filter screen filaments in the tension structure net 4 according to the gravity and finally are gathered to the water disc assembly 9. In this embodiment, the mesh size of the tension structure net 4 is selected to be 5 times the mesh size of the filter net.

Further, as a preferred embodiment, the water-blocking module 2, the ultra-fine filter screen 3 and the tension structure screen 4 are made of hydrophilic materials or materials with hydrophilic coatings;

the membrane structure filter is made of water absorption materials.

Further, as a preferred embodiment, the water tray assembly 9 includes a water tray housing 91 and a drawer 92 drawably disposed inside the water tray housing 91;

an overflow port 93 is arranged at the upper end of one side of the water tray shell 91, and the overflow port 93 is positioned at the upper side of the drawer 92;

the lower inner wall of the overflow port 93 is at the same height as the upper surface of the drawer 92. In this embodiment, water drops blocked by the water blocking module 2, the ultra-micro filter screen 3 and the tension structure screen 4 are gathered in the drawer 92 in the water tray housing 91, and the drawer 92 is partially located outside the water tray housing 91, so that the drawer 92 is pulled or pushed conveniently, and the drawer 92 is separated from the water tray housing 91 or enters the water tray housing 91. When the water in the drawer 92 is full, the water in the drawer 92 can overflow from the overflow port 93, and the drawer 92 can be pulled out, so that the water in the drawer 92 is poured out and cleaned.

Further, as a preferred embodiment, the ultramicro filter net 3, the tension structure net 4 and the membrane structure filter are detachably arranged in the shell 1;

the ultramicro filter screen 3, the tension structure screen 4 and the membrane structure filter are respectively connected with the inner wall of the shell 1 in a clamping way. In this embodiment, can be equipped with a plurality of draw-in grooves on the internal perisporium of casing 1, the periphery wall of ultramicro filter screen 3, the periphery wall of tension structure net 4 and the periphery wall of membrane structure filter screen block respectively in a draw-in groove, realize the dismantlement between ultramicro filter screen 3, tension structure net 4 and the membrane structure filter screen and the casing 1 and be connected, be convenient for change, maintain or wash.

Example two

An unpowered salt fog filtering device comprises a shell 1, a water tray component 9 arranged at the lower end of the shell 1, a water blocking module 2, an ultramicro filter screen 3, a tension structure net 4, a first filter 5 and a second filter 6 which are sequentially arranged in the shell 1, wherein the first filter 5 is a membrane structure filter, the second filter 6 is a middle-effect filter or a high-effect filter,

the water blocking module 2 has walls with hydrophilicity for blocking large saline water droplets in the fluid;

the ultramicro filter screen 3 is provided with hydrophilic filter screen filaments, and the filter screen filaments of the ultramicro filter screen 3 can make liquid spread along the ultramicro filter screen and fall into the water tray component 9 due to gravity;

the tension structure net 4 has hydrophilicity, the aperture of the mesh of the tension structure net 4 is larger than that of the mesh of the ultra-micro filter screen 3, so as to reduce the flow velocity when the fluid passing through the ultra-micro filter screen 3 flows through the tension structure net 4;

the first filter 5 is used for absorbing mist water drops containing salt and precipitating the salt in the mist water drops on the first filter 5;

the second filter 6 is used to block salt particles in the fluid that escape from the first filter 5 due to weathering.

The following describes preferred methods of use of the present application:

a using method of an unpowered salt spray filtering device comprises a shell 1, a water tray assembly 9 arranged at the lower end of the shell 1, a water blocking module 2, an ultramicro filter screen 3, a tension structure net 4, a first filter 5 and a second filter 6 which are sequentially arranged inside the shell 1, wherein the first filter 5 is a membrane structure filter, the second filter 6 is a medium-efficiency filter or a high-efficiency filter, and the method comprises the following steps:

fluid passes through an air inlet 7 of the shell 1, sequentially passes through a water blocking module 2, an ultra-micro filter screen 3, a tension structure net 4, a first filter 5 and a second filter 6, and enters a room through an air outlet 8 of the shell 1;

the large saline droplets in the fluid are blocked by the hydrophilic walls of the water-blocking module 2 and enter the underlying water tray assembly 9 by gravity;

the small fog drops in the fluid contact with the hydrophilic filter screen filaments of the ultra-micro filter screen 3, spread along the hydrophilic filter screen filaments of the ultra-micro filter screen 3 and enter the water tray component 9 positioned below due to gravity;

the pore diameter of the mesh of the tension structure net 4 with hydrophilicity is larger than that of the mesh of the ultra-micro filter screen 3, the flow speed of partial water drops in the fluid when passing through the tension structure net 4 is reduced, and partial water drops in the fluid are captured by the tension structure net 4 due to tension and enter a water tray assembly 9 positioned below due to gravity;

the mist water drops containing salt in the fluid contact with the first filter 5, are absorbed and spread out, and are evaporated to follow the fluid to leave, and the salt in the mist water drops is separated out on the first filter 5;

salt particles in the fluid escaping from the first filter 5 due to weathering are blocked by the second filter 6.

Further, as a preferred embodiment, after the unpowered salt spray filtering device operates for a preset time, salt hardened or scaled on the first filter 5 is cleaned.

Further, as a preferred embodiment, the pressure difference across the second filter 6 is monitored, and the second filter 6 is replaced when the pressure difference exceeds a predetermined range.

The above description is only an example of the preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and those skilled in the art should be able to realize the equivalent alternatives and obvious variations of the present invention.

Claims (10)

1. An unpowered salt mist filtering device is characterized by comprising a shell, a water tray assembly arranged at the lower end of the shell, and a water blocking module, an ultramicro filter screen, a tension structure screen, a first filter and a second filter which are sequentially arranged in the shell;

the first filter is a membrane structure filter, and the second filter is a medium-efficiency filter or a high-efficiency filter;

an air inlet is formed in one end of the shell, an air outlet is formed in the other end of the shell, the water blocking module is arranged close to the air inlet, and the second filter is arranged close to the air outlet;

the ultramicro filter screen comprises a plurality of filter screen layers which are stacked, and meshes of each filter screen layer are arranged in a staggered mode;

the pore size of the mesh of the tension structure net is larger than that of the mesh of the ultra-micro filter screen so as to reduce the flow velocity of the fluid passing through the ultra-micro filter screen when flowing through the tension structure net;

the water disc assembly is communicated with the shell and is right opposite to the water blocking module, the ultramicro filter screen, the tension structure net and the first filter.

2. The unpowered salt spray filter of claim 1 wherein each of the screen layers comprises: first and second screen filaments arranged to cross each other;

wherein each of said first screen filaments and at least one of said second screen filaments intersect to form an intersection;

wherein, the meshes of the filter screen layer are enclosed between every two adjacent first filter screen filaments and two adjacent second filter screen filaments;

the mesh of one of the screen layers is aligned with the intersection of the other of the screen layers.

3. The unpowered salt fog filtering device of claim 1, wherein the air inlet is shaped to conform to the shape of the water blocking module, and the air outlet is shaped to conform to the shape of the medium-efficiency filter or the high-efficiency filter.

4. The unpowered salt spray filtering device of claim 1, wherein an outer peripheral wall of the water blocking module is in sealing engagement with an inner peripheral wall of the air inlet;

the outer peripheral wall of the middle-effect or high-efficiency filter is in sealing fit with the inner peripheral wall of the air outlet.

5. The unpowered salt fog filtering device of claim 1, wherein a space is provided between the ultra-micro filter screen and the water blocking module;

the tension structure net is closely contacted with one side of the ultramicro filter screen far away from the water blocking module;

certain intervals are arranged between the tension structure net and the membrane structure filter, between the membrane structure filter and the middle-effect filter or the high-effect filter, or the tension structure net and the membrane structure filter, and between the membrane structure filter and the middle-effect filter or the high-effect filter are in mutual close contact.

6. The unpowered salt fog filter device of claim 1, wherein the mesh openings of each of the filter layers are less than 0.1mm in diameter;

the aperture of the mesh of the tension structure net is 3-10 times of that of the ultra-micro filter screen.

7. The unpowered salt spray filtering device of claim 1, wherein the water blocking module, the ultra-micro filter screen, and the tension structure screen are all made of hydrophilic materials or materials with hydrophilic coatings;

the membrane structure filter is made of water-absorbing materials.

8. The unpowered salt spray filter of claim 1 wherein the water tray assembly includes a water tray housing and a drawer drawably disposed within the water tray housing;

an overflow port is formed in the upper end of one side of the water tray shell and is positioned on the upper side of the drawer;

the height of the inner wall of the lower side of the overflow port is the same as that of the upper surface of the drawer.

9. The unpowered salt spray filtration device of claim 1 wherein the microminiature filter screen, the tension structure screen, and the membrane structure filter are removably disposed within the housing;

the ultramicro filter screen, the tension structure net and the membrane structure filter are respectively connected with the inner wall of the shell in a clamping manner.

10. An unpowered salt mist filtering device is characterized by comprising a shell, a water tray assembly arranged at the lower end of the shell, a water blocking module, an ultramicro filter screen, a tension structure screen, a first filter and a second filter which are sequentially arranged in the shell, wherein the first filter is a membrane structure filter, the second filter is a medium-effect filter or a high-efficiency filter,

the water-blocking module has walls with hydrophilicity for blocking saline large water droplets in the fluid;

the ultramicro filter screen is provided with hydrophilic filter screen filaments, and the filter screen filaments of the ultramicro filter screen can make liquid spread along the ultramicro filter screen and fall into the water tray component due to gravity;

the tension structure net has hydrophilicity, and the pore diameter of the mesh of the tension structure net is larger than that of the mesh of the ultra-micro filter screen so as to reduce the flow velocity of fluid passing through the ultra-micro filter screen when flowing through the tension structure net;

the first filter is used for absorbing mist water drops containing salt and separating out the salt in the mist water drops on the first filter;

the second filter is for blocking salt particles in the fluid from escaping from the first filter due to weathering.

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