Rainproof sand filtering and salt mist filtering combined device and waterproof sand filter for salt mist filter

Abstract

The embodiment of the utility model relates to the technical field of salt mist treatment, in particular to a rainproof sand filtering and salt mist filtering combined device and a waterproof sand filter for a salt mist filter. The waterproof sand filter comprises a waterproof sand filter box body, a waterproof shutter and a sand filtering device, the waterproof sand filter box body defines a first containing cavity with a first air inlet and a first air outlet, the first air inlet is located at the first end of the waterproof sand filter box body, and the first air outlet is located at the second end of the waterproof sand filter box body; the second end of the waterproof sand filter box body is used for being connected with a salt mist filter; the waterproof shutter is arranged at the first end of the waterproof sand filter box body and is used for preventing external water from entering the first accommodating cavity from the air inlet; and the sand filtering device is used for filtering sand in the gas passing through the sand filtering device. According to the waterproof sand filter provided by the embodiment of the invention, rainwater and sand grains in air can be filtered in advance before salt mist is filtered, so that the service life and the effect of a filter element of a salt mist filter are improved, and the service life of functional equipment such as electrical equipment and mechanical equipment is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of salt fog treatment, and in particular to a rainproof sand filtering and salt fog filtering combined device and a waterproof sand filter for a salt fog filter. Background Art

[0002] The statements herein merely provide background information related to the present application and do not necessarily constitute prior art.

[0003] With the development of the ocean, the number of devices used at sea and sea is increasing; electrical equipment, mechanical equipment and other functions usually require internal cooling, ventilation or dehumidification. In this salt spray environment, salt will enter the functional equipment with the air, and under the mixed effect of water vapor, the components inside the functional equipment will corrode and rust, which will reduce the service life of the functional equipment. Utility Model Content

[0004] A brief overview of the present application is provided below in order to provide a basic understanding of certain aspects of the present application. It should be understood that this overview is not an exhaustive overview of the present application. It is not intended to identify the key or important parts of the present application, nor is it intended to limit the scope of the present application. Its purpose is merely to present certain concepts in a simplified form as a prelude to a more detailed description discussed later.

[0005] A first aspect of an embodiment of the present application provides a waterproof sand filter for a salt spray filter, comprising a waterproof sand filter case, a waterproof shutter and a sand filtering device, the waterproof sand filter case defines a first accommodating chamber having a first air inlet and a first air outlet, the first air inlet is located at the first end of the waterproof sand filter case, the first air outlet is located at the second end of the waterproof sand filter case, and the second end of the waterproof sand filter case is used to connect the salt spray filter; the waterproof shutter is arranged at the first end of the waterproof sand filter case, for blocking external water from entering the first accommodating chamber from the air inlet; the sand filtering device is arranged in the first accommodating chamber for filtering sand in the gas passing through the sand filtering device.

[0006] Furthermore, the waterproof shutter is composed of a plurality of arranged bodies, each of which is provided with a plurality of hook portions, and the hook portions of adjacent bodies are overlapped to form a waterproof structure.

[0007] Furthermore, the waterproof shutter is fixed to the first end of the waterproof sand filter box through a first pressing plate.

[0008] Furthermore, a drainage hole is provided at the bottom of the waterproof sand filter box body and in the area corresponding to the waterproof shutter, and the drainage hole is used to discharge the external water blocked by the waterproof shutter.

[0009] Furthermore, the sand filtering device is composed of a plurality of bent plates arranged in an arrangement, and each bent plate is used to guide the sand in the gas passing through the sand filtering device to the bottom of the waterproof sand filter box.

[0010] Furthermore, a ramp plate is provided at least in part of the bottom of the waterproof sand filter box corresponding to the sand filtering device, and a sand discharge port is provided in the bottom of the waterproof sand filter box corresponding to the bottom end of the ramp plate, and the ramp plate is used to guide the sand received by the sand filtering device to the sand discharge port.

[0011] Furthermore, an openable and closable sand discharge baffle is provided at the sand discharge port.

[0012] The second aspect of the embodiment of the present application provides a rainproof sand filtering and salt mist filtering combination device, including the waterproof sand filter and salt mist filter provided by the first aspect of the embodiment of the present application, the salt mist filter is connected to the second end of the waterproof sand filter box, and is used to filter the salt mist in the gas passing through the salt mist filter.

[0013] Furthermore, the salt spray filter includes a salt spray filter housing, which defines a second accommodating chamber having a second air inlet and a second air outlet, the second air inlet being connected to the first air outlet of the waterproof sand filter, and a salt spray filter primary filter element and a salt spray filter advanced filter element are arranged in the second accommodating chamber, and the size of the minimum salt spray that can be filtered by the salt spray filter advanced filter element is smaller than the size of the minimum salt spray that can be filtered by the salt spray filter primary filter element.

[0014] Furthermore, the rainproof, sand-filtering and salt-fog-filtering combined device also includes a fan, which is connected to the salt-fog filter housing, the air inlet of the fan is connected to the second air outlet, the fan is connected to a motor, and the fan rotates when driven by the motor to discharge the air received by the air inlet to the equipment to be cooled through the air outlet of the fan.

[0015] The rainproof sand filter and salt mist filter combination device and the waterproof sand filter for the salt mist filter provided by the present application can filter out rainwater and sand in the air before filtering the salt mist, so as to prevent the sand from clogging the filter screen of the salt mist filter element and improve the service life and effect of the salt mist filter element. Thereby, the functions of electrical equipment, mechanical equipment, etc. usually require internal cooling ventilation or dehumidification to ensure the service life of these functional equipment. The rainproof sand filter and salt mist filter combination device and the waterproof sand filter for the salt mist filter provided by the present application are compact in structure, meet the harsh use environment, and are very suitable for cooling equipment in the seaside desert environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Other objects and advantages of the present application will be apparent from the following description of the present application with reference to the accompanying drawings, which will help to provide a comprehensive understanding of the present application.

[0017] Figure 1It is a structural schematic diagram of a rainproof, sand-filtering and salt-fog-filtering combined device provided according to some embodiments of the present application;

[0018] Figure 2 is an exploded view of a rainproof, sand-filtering, and salt-fog-filtering combined device provided according to some embodiments of the present application;

[0019] Figure 3 It is a cross-sectional view of a rainproof, sand-filtering, and salt-fog-filtering combined device provided according to some embodiments of the present application.

[0020] In the figure, 10 is a rainproof sand filter and salt spray filter combined device, 100 is a waterproof sand filter, 110 is a waterproof sand filter box, 120 is a waterproof shutter, 130 is a sand filter device, 140 is a sand discharge baffle, 200 is a salt spray filter, 210 is a salt spray filter box, 220 is a salt spray filter primary filter element, 230 is a salt spray filter advanced filter element, 300 is a fan, and 400 is a motor. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in conjunction with the drawings of the embodiments of the present application. Obviously, the described embodiment is one embodiment of the present application, not all embodiments. Based on the described embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0022] Unless otherwise defined, technical or scientific terms used in this application should have the common meanings understood by persons having ordinary skills in the field to which this application belongs.

[0023] From the perspective of atmospheric cloud physics, salt fog is a salt core that exists in the atmosphere and is in the form of wet particles. It is a dispersion system composed of fine droplets containing salt. Whether at the seaside or more than 50 km from the sea, more than 90% of the salt fog (salt core) particles are smaller than 5μm. Another study believes that 98% of the primary ecological salt fog at sea is composed of particles with a diameter greater than 1.6μm. Because obstacles have a blocking effect on salt cores, the content and deposition of indoor salt fog are less than those outdoors. After a period of time, some of the salt fog that invades the room under the salt fog environment will settle to the ground or the surface of objects under the influence of gravity; some of the large droplets will shrink into small droplets or form dry salt particles (the critical humidity of salt fog equilibrium is 76%RH) as the atmospheric moisture evaporates; some of them will still float in the air. Functional equipment such as electrical equipment and mechanical equipment usually require internal components to be ventilated (using ventilation equipment) or dehumidified (using dehumidification equipment). If the salt fog air in the salt fog environment directly enters the functional equipment, the internal components are very susceptible to corrosion, which will reduce the service life of the functional equipment; of course, it will also reduce the service life of the ventilation equipment or dehumidification equipment.

[0024] In the related art, a salt mist filter box is used to filter out the salt in the salt mist air, so that the salt in the air entering the ventilation equipment or dehumidification equipment is basically filtered out, so that the salt content of the air entering the functional equipment is extremely low, or even zero, thereby increasing the service life of the ventilation equipment or dehumidification equipment, and related functional equipment.

[0025] However, in the seaside desert environment, the wind and sand are strong, which seriously affects the use effect of the salt spray filter. Sand particles block the filter screen of the salt spray filter element, which will shorten the service life of the filter element. In serious cases, it will affect the safe operation of the equipment.

[0026] Therefore, this embodiment provides a waterproof sand filter for a salt mist filter and a rainproof sand filter and salt mist filter combined device having the waterproof sand filter. Figure 1 is a structural schematic diagram of a rainproof, sand-filtering, and salt-fog-filtering combined device 10 provided according to some embodiments of the present application; Figure 2 is an exploded view of a rainproof, sand-filtering, and salt-fog-filtering combined device 10 provided according to some embodiments of the present application; Figure 3 It is a cross-sectional view of a rainproof, sand-filtering, and salt-fog-filtering combined device 10 provided according to some embodiments of the present application.

[0027] The waterproof sand filter 100 includes a waterproof sand filter housing 110, a waterproof shutter 120, and a sand filter device 130. The waterproof sand filter housing 110 defines a first accommodating chamber having a first air inlet and a first air outlet, wherein the first air inlet is located at a first end of the waterproof sand filter housing 110, and the first air outlet is located at a second end of the waterproof sand filter housing 110, and the second end of the waterproof sand filter housing 110 is used to connect a salt spray filter 200. The waterproof shutter 120 is disposed at the first end of the waterproof sand filter housing 110, and is used to prevent external water from entering the first accommodating chamber from the air inlet. The sand filter device 130 is disposed in the first accommodating chamber, and is used to filter sand in the gas passing through the sand filter device 130.

[0028] The waterproof sand filter 100 may also be referred to as an integrated sand filter, and the waterproof sand filter housing 110 may also be referred to as an integrated sand filter housing.

[0029] The waterproof shutter 120 is composed of a plurality of arranged bodies, each of which is provided with a plurality of hooks, and the hooks of adjacent bodies are overlapped to form a waterproof structure.

[0030] The waterproof shutter 120 can be made of special-shaped aluminum profiles. The special-shaped aluminum profile body has several layers of hooks. By arranging the aluminum profiles as required and overlapping the hooks of adjacent aluminum profiles, a multi-layer rainproof structure can be formed.

[0031] In some embodiments, the waterproof shutter 120 is fixed to the first end of the waterproof sand filter housing 110 by a first pressing plate. Specifically, the waterproof shutter 120 can be blocked in the integrated sand filter housing by bolts and pressing plates, thereby ensuring the stability of the installation. Bolt connections usually do not require special tools or skills for installation and removal. This makes the operation more convenient and flexible when repairing, replacing parts or making adjustments.

[0032] The bottom of the waterproof sand filter box 110 and the area corresponding to the waterproof shutter 120 are provided with drainage holes, which are used to discharge the external water blocked by the waterproof shutter 120. In this way, the external rainwater flows out through the drainage holes on the lower side of the box after being blocked by the aluminum profile hook, avoiding the accumulation of rainwater.

[0033] Specifically, the waterproof shutter 120 structure includes a window frame, a plurality of shutters are fixedly connected to the middle of the inner wall at the bottom end of the window frame, a second hook is fixedly connected to the front side of the right end of the shutter, a third hook is fixedly connected to the middle of the right end of the shutter, a first hook is fixedly connected to the rear side of the left end of the shutter, and the middle of the top of the shutter is fixedly connected to the inner wall at the top of the window frame to form a multi-layer hidden waterproof structure, which greatly improves the protection effect through multi-layer blocking without affecting the air intake. A plurality of drainage holes are provided at the bottom of the window frame to drain water out of the window frame, and the upper and lower parts of the rear sides of the left and right ends of the window frame are fixedly connected to the top of the window frame. A mounting seat is connected to facilitate the installation of the window frame. A first hook, a second hook, a third hook and a dustproof net are arranged on the louver to form a multi-layer concealed waterproof and sand-proof structure. The protection effect is greatly improved through multi-layer blocking without affecting the air intake. A first baffle and a second baffle are arranged to form a drainage groove, and water can be discharged out of the window frame through the drainage hole. A mounting seat and a threaded hole are arranged on the edge of the window frame to facilitate the installation of the window frame and improve the installation efficiency. A stainless steel sheet is arranged on the outside of the window frame, the structure is simple and light, the anti-corrosion effect is good, and the service life of the window frame is extended.

[0034] There are threaded holes in the middle of the mounting seat to facilitate the installation of the window frame and improve the installation efficiency. The front side of the inner wall of the bottom end of the window frame is fixedly connected with a first baffle, and the rear side of the inner wall of the bottom end of the window frame is fixedly connected with a second baffle to form a drainage groove, and then the water can be discharged out of the window frame through the drainage holes. A dustproof net is fixedly connected to the front end of the window frame to isolate large particles of impurities from the outside. A stainless steel thin plate is fixedly connected to the outside of the window frame, which has good anti-corrosion effect and extends the service life of the window frame. Bosses are fixedly connected to the front and rear ends of the louver fan to facilitate air intake.

[0035] By arranging a mounting seat and a threaded hole on the side of the window frame, the installation of the window frame is facilitated and the installation efficiency is improved. By arranging a first hook, a second hook, a third hook and a dustproof net on the louver, a multi-layer concealed waterproof and sand-proof structure is formed. The protection effect is greatly improved through multi-layer blocking without affecting the air intake. By arranging a first baffle and a second baffle, a drainage groove is formed, and water and sand can be discharged out of the window frame through the drainage hole. By arranging a stainless steel sheet on the outside of the window frame, the structure is simple and light, the anti-corrosion effect is good, and the service life of the window frame is extended.

[0036] It is understandable that the above-mentioned shutters are only for illustrative purposes. In other embodiments, other types of shutters may be used as long as they can block water. For example, the waterproof shutter 120 is composed of a series of parallel shutters, each of which has a certain inclination angle. This design enables the shutter to effectively block the inflow of rainwater. The inclination angle of the shutter is to allow rainwater to flow down the surface of the shutter and eventually drain into the sump under the window frame. This design helps to maintain ventilation performance while preventing rainwater from seeping in. The waterproof shutter 120 can use special sealing technology to enhance its waterproof performance. Rubber sealing strips are provided at both ends of each shutter. When the waterproof shutter 120 is closed, these sealing strips will fit tightly with the window frame to form a perfect seal, thereby preventing rainwater from seeping in through the gaps between the shutters.

[0037] The sand filtering device 130 is composed of a plurality of bent plates arranged in an array, and each bent plate is used to guide the sand in the gas passing through the sand filtering device 130 to the bottom of the waterproof sand filter box 110 .

[0038] The interior of the inner sand filter device 130 is composed of multiple layers of bent plates arranged according to the required size and welded in the integrated sand filter box. Specifically, the cross-section of the bent plate is in the shape of "<", and the open end is facing the lower right. It can be understood that the above-mentioned sand filter device 130 is only for schematic illustration. In other embodiments, other types of sand filter devices 130 can be used as long as they can hinder the sand.

[0039] At least a portion of the bottom of the waterproof sand filter housing 110 corresponding to the sand filter device 130 is provided with a ramp plate, and a sand discharge port is provided at the bottom of the waterproof sand filter housing 110 corresponding to the bottom end of the ramp plate, and the ramp plate is used to guide the sand received by the sand filter device 130 to the sand discharge port. There can be multiple ramp plates, and the inclination angle of the ramp plate can be determined according to experimental conditions, which will not be described in detail here.

[0040] The sand discharge port is provided with an openable and closable sand discharge baffle 140, thereby preventing sand from accumulating in the first accommodating chamber. When the sand accumulated in the first accommodating chamber reaches a certain level, the user can open the sand baffle to discharge the sand.

[0041] The working principle of the integrated sand filter provided in this embodiment is as follows: when outside air enters the integrated sand filter, the rainwater in the air is first blocked by the waterproof shutters 120, and then flows out through the drainage holes on the lower side of the waterproof sand filter box 110 after being blocked by the aluminum profile hooks. Then, the sand particles in the air are blocked by the densely distributed multi-layer curved plates in the sand filtering device 130 and fall onto the slope plate at the bottom of the waterproof sand filter box 110. Due to their own weight, the sand particles will roll down to the sand discharge port on the waterproof sand filter box 110 at the tail of the slope plate, and the sand discharge baffle 140 is opened regularly to discharge the sand.

[0042] The waterproof sand filter 100 provided in this embodiment can filter out rainwater and sand in the air before filtering salt mist, so as to prevent sand from clogging the filter screen of the filter element of the salt mist filter 200 and improve the service life and effect of the filter element of the salt mist filter 200. Thus, the functions of electrical equipment, mechanical equipment, etc. usually require internal cooling ventilation or dehumidification to ensure the service life of these functional equipment. The rainproof sand filter and salt mist filter combination device 10 and the waterproof sand filter 100 for the salt mist filter provided in this application are compact in structure, meet the harsh use environment, and are very suitable for cooling equipment in the seaside desert environment.

[0043] The present embodiment also provides a rainproof sand filtering and salt mist filtering combination device 10, which includes any of the above-mentioned waterproof sand filters 100 and a salt mist filter 200. The salt mist filter 200 is connected to the second end of the waterproof sand filter box 110 and is used to filter the salt mist in the gas passing through the salt mist filter 200.

[0044] The salt spray filter 200 includes a salt spray filter housing 210, which defines a second accommodating chamber having a second air inlet and a second air outlet. The second air inlet is connected to the first air outlet of the waterproof sand filter 100. A salt spray filter primary filter element 220 and a salt spray filter advanced filter element 230 are arranged in the second accommodating chamber. The size of the minimum salt spray that can be filtered by the salt spray filter advanced filter element 230 is smaller than the size of the minimum salt spray that can be filtered by the salt spray filter primary filter element 220.

[0045] Specifically, the component structure of the salt spray filter 200 is composed of a salt spray filter primary filter element 220, a salt spray filter advanced filter element 230, and a salt spray filter housing 210. The salt spray filter primary filter element 220 uses an imported filter element to filter dust and solid particles containing salt spray in the air with a diameter greater than 0.5 mm; the salt spray filter advanced filter element 230 uses an imported filter element to filter salt spray and impurities in the air with a diameter greater than 5 μm; the salt spray filter primary filter element 220 and the salt spray filter advanced filter element 230 are both fixed in the salt spray filter housing 210 by baffles and bolts. Working principle of the salt spray filter 200: The external air passes through the primary filter element and the advanced filter element to filter out fine impurities and salt spray particles.

[0046] In some embodiments, the rainproof, sand-filtering and salt-fog-filtering combination device 10 also includes a fan 300, which is connected to the salt-fog filter housing 210, and the air inlet of the fan 300 is connected to the second air outlet. The fan 300 is connected to a motor 400, and the fan 300 rotates when driven by the motor 400 to discharge the air received by the air inlet to the equipment to be cooled through the air outlet of the fan 300.

[0047] The working principle of the rainproof sand filter and salt mist filter combined device 10 of this embodiment is as follows: the external air passes through the integrated sand filter to filter out rainwater and sand particles, and then passes through the salt mist filter 200 to filter out salt mist and impurities, and then passes through the fan 300 to introduce the filtered air into the device to cool the device. The integrated sand filter, the salt mist filter 200, the fan 300, and the motor 400 (which can be an explosion-proof three-phase asynchronous motor 400) are fixed together by bolts and nuts.

[0048] This embodiment provides a combined structure that integrates functions such as rain protection, sand filtering, and salt fog filtering. Through this inventive structure, sand particles and salt fog in the air are filtered, and then the filtered air is introduced into the equipment through the fan 300 for cooling. This embodiment combines several components, including a waterproof shutter 120, a sand filtering device 130, and a salt fog filtering primary filter element 220 and a high-level filter element. All metal parts of the structure are made of stainless steel 316L, which has very good anti-corrosion performance. The outside air is filtered through several layers of devices in the box to meet the needs of the cooling equipment. The rainproof sand filter and salt spray filter combined device 10 is composed of four components: an integrated sand filter, a salt spray filter 200, a fan 300, and an explosion-proof three-phase asynchronous motor 400. The components are fixed by bolts, and each component is composed of waterproof shutters 120, a sand filter device 130, a salt spray filter primary filter element 220, a salt spray filter advanced filter element 230, a sand discharge baffle 140, an integrated sand filter box, a salt spray filter box 210 and other parts. The combined structure can meet multiple functions such as rainproof, sand filtering, and salt spray filtering. In some embodiments, waterproof sand filters 100 are respectively arranged at both ends of the salt spray filter box 210 to improve efficiency.

[0049] The rainproof sand filter and salt mist filter combined device 10 provided in this embodiment can filter out rainwater and sand in the air before filtering salt mist, so as to prevent sand from clogging the filter screen of the filter element of the salt mist filter 200, and improve the service life and effect of the filter element of the salt mist filter 200. Thereby, the functions of electrical equipment, mechanical equipment, etc. usually require internal cooling ventilation or dehumidification to ensure the service life of these functional equipment. The rainproof sand filter and salt mist filter combined device 10 and the waterproof sand filter 100 for the salt mist filter provided in this application are compact in structure, meet the harsh use environment, and are very suitable for cooling equipment in the seaside desert environment.

[0050] Regarding the embodiments of the present application, it should also be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other to obtain new embodiments.

[0051] The above are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. The protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A waterproof sand filter for a salt spray filter, characterized in that: include: A waterproof sand filter box, wherein the waterproof sand filter box defines a first accommodating cavity having a first air inlet and a first air outlet, wherein the first air inlet is located at a first end of the waterproof sand filter box, and the first air outlet is located at a second end of the waterproof sand filter box, and the second end of the waterproof sand filter box is used to connect the salt spray filter; A waterproof shutter, arranged at the first end of the waterproof sand filter housing, for preventing external water from entering the first accommodating chamber through the air inlet; The sand filter device is arranged in the first accommodating chamber and is used for filtering sand in the gas passing through the sand filter device.

2. The waterproof sand filter according to claim 1, characterized in that: The waterproof shutter is composed of a plurality of arranged main bodies, each of which is provided with a plurality of hooks, and the hooks of adjacent main bodies are overlapped to form a waterproof structure.

3. The waterproof sand filter according to claim 1, characterized in that: The waterproof shutter is fixed to the first end of the waterproof sand filter box through a first pressing plate.

4. The waterproof sand filter according to claim 1, characterized in that: A drainage hole is arranged at the bottom of the waterproof sand filter box and in an area corresponding to the waterproof shutter, and the drainage hole is used to discharge the external water blocked by the waterproof shutter.

5. The waterproof sand filter according to claim 1, characterized in that: The sand filter device is composed of a plurality of arranged curved plates, each of which is used to guide the sand in the gas passing through the sand filter device to the bottom of the waterproof sand filter box.

6. The waterproof sand filter according to claim 5, characterized in that: A ramp plate is provided at least in part of the bottom of the waterproof sand filter box corresponding to the sand filtering device, and a sand discharge port is provided in the bottom of the waterproof sand filter box corresponding to the bottom end of the ramp plate. The ramp plate is used to guide the sand received by the sand filtering device to the sand discharge port.

7. The waterproof sand filter according to claim 6, characterized in that: The sand discharge port is provided with an openable and closable sand discharge baffle.

8. A rainproof, sand-filtering and salt-fog-filtering combined device, characterized in that: include: The waterproof sand filter according to any one of claims 1 to 7; The salt mist filter is connected to the second end of the waterproof sand filter housing and is used for filtering the salt mist in the gas passing through the salt mist filter.

9. The rainproof, sand-filtering and salt-fog-filtering combined device according to claim 8, characterized in that: The salt spray filter comprises a salt spray filter housing, which defines a second accommodating chamber having a second air inlet and a second air outlet, wherein the second air inlet is communicated with the first air outlet of the waterproof sand filter, and a salt spray filter primary filter element and a salt spray filter advanced filter element are arranged in the second accommodating chamber, wherein the size of the minimum salt spray that can be filtered by the salt spray filter advanced filter element is smaller than the size of the minimum salt spray that can be filtered by the salt spray filter primary filter element.

10. The rainproof, sand-filtering and salt-fog-filtering combined device according to claim 9, characterized in that: The rainproof, sand-filtering and salt-fog-filtering combined device also includes a fan, which is connected to the salt-fog filter housing, an air inlet of the fan is communicated with the second air outlet, and the fan is connected to a motor. The fan rotates when driven by the motor to discharge the air received by the air inlet to the equipment to be cooled via the air outlet of the fan.

Images