Nuclear power station air filtering device and air filtering unit thereof

Abstract

The utility model discloses a nuclear power station air filtering device and an air filtering unit thereof, the air filtering unit comprises a shell, and a dirt holding layer and a filtering layer which are sequentially arranged in the shell, two opposite sides of the shell are respectively provided with an air inlet and an air outlet, the dirt holding layer is close to the air inlet, and the filtering layer is close to the air outlet; the filtering layer comprises at least two filtering pieces which are sequentially arranged in the airflow direction, and each filtering piece comprises a metal filtering piece; a plurality of filtering holes communicated with the air inlet and the air outlet are formed in the metal filtering sheet; the air filtering device of the nuclear power station comprises a shell and the air filtering units, the number of the air filtering units is at least two, and the at least two air filtering units are arranged in the shell in an array mode. According to the air purifier, effective air filtration can be achieved, the filter piece comprises the metal filter piece, repeated use can be achieved through cleaning, and the air purifier is easy to produce, lower in cost and more environmentally friendly.

Description

Technical Field

[0001] The utility model relates to the technical field of nuclear power plant air purification, in particular to an air filtering device and an air filtering unit thereof for a nuclear power plant. Background Art

[0002] The filters currently used in the air supply system of nuclear power plants are of plate and frame type, which are mainly used to filter large particles and flocculent matter. The filter elements are mostly non-woven fabrics made of polymer fibers or other fiber materials. This material is not reusable and is used in large quantities. The existing filters are replaced and scrapped after reaching the final resistance in actual use. The fiber filter elements need to be landfilled, which increases the pressure on environmental protection and consumes economic costs. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide an air filter device for a nuclear power plant and an air filter unit thereof.

[0004] The utility model solves the technical problem by adopting the following technical solution: an air filter unit comprises a housing, a dirt-receiving layer and a filter layer sequentially arranged in the housing, an air inlet and an air outlet are respectively arranged on opposite sides of the housing, the dirt-receiving layer is close to the air inlet, and the filter layer is close to the air outlet;

[0005] The filter layer comprises at least two filter elements arranged in sequence along the air flow direction, and the filter element comprises a metal filter sheet; the metal filter sheet is provided with a plurality of filter holes communicating with the air inlet and the air outlet.

[0006] In some embodiments, the pore size of the filter element near the air inlet is larger than the pore size of the filter element near the air outlet; and the metal filter sheet of the filter element is a mesh wire structure.

[0007] In some embodiments, the filter layer includes a first filter element near the air inlet and a second filter element near the air outlet. In the first filter element, the mesh number of the metal filter is 50-150 mesh, and the wire diameter of the metal wire of the metal filter is 200-400 μm; in the second filter element, the mesh number of the metal filter is 200-300 mesh, and the wire diameter of the metal wire of the metal filter is 10-150 μm.

[0008] In some embodiments, the metal filter of the filter element is formed by interlacing and weaving a plurality of metal wires, and the cross-section of the metal filter is wavy; the cross-sections of adjacent metal filter sheets are the same, or the cross-sections of adjacent metal filter sheets are symmetrically arranged.

[0009] In some embodiments, the air filtration unit also includes an isolation layer arranged in the shell, the isolation layer includes a plurality of isolation members arranged along the air flow direction, and the isolation members are provided with a plurality of through holes connecting the air inlet and the air outlet; among the air inlet, the dirt receiving layer, at least two filter members and the air outlet, an isolation member is provided between any two adjacent ones.

[0010] In some embodiments, the spacer is a metal mesh spacer made of metal rods, and the mesh shape of the spacer is diamond, rectangular or circular.

[0011] In some embodiments, the dirt-receiving layer is composed of 5 to 15 stacked metal filter screens, and the filter mesh holes of adjacent metal filter screens are staggered.

[0012] In some embodiments, the air filter unit also includes two support members, which are respectively arranged on the air inlet and air outlet of the shell; the support members include a plurality of support bars, which are arranged at intervals or crosswise, and the two ends of the support bars are connected to the outer edge of the air inlet or air outlet.

[0013] In some embodiments, the air filter unit is mounted on a wall, and a plurality of vents are provided on the wall, and the air inlet or outlet corresponds to the vents;

[0014] The air filter unit further comprises a sealing member, which is arranged on the outer edge of one side of the shell body and contacts the wall body to seal the space between the air filter unit and the wall body.

[0015] The utility model also proposes an air filtration device for a nuclear power plant, comprising a housing and the above-mentioned air filtration units. The number of the air filtration units is at least two, and the at least two air filtration units are arranged in an array within the housing.

[0016] Beneficial effects of the utility model:

[0017] The utility model relates to an air filter device for a nuclear power plant and an air filter unit thereof. Air enters the air filter unit from an air inlet, passes through a dirt-receiving layer and a filter layer in sequence, and is then discharged from an air outlet. The filter layer includes at least two filter elements, which can achieve effective filtration on the one hand and increase the service life of the air filter unit on the other hand, so that the air is in full contact with the filter layer and the filtering effect is improved. The filter element includes a metal filter sheet, which can be reused by cleaning, and is simple to produce, has a lower cost, and is more environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0019] Figure 1 is a front view of an air filter unit in some embodiments of the present invention;

[0020] Figure 2 is a cross-sectional view of an air filter unit in some embodiments of the present invention;

[0021] Figure 3 yes Figure 2 A partial enlarged view of point A in the middle;

[0022] Figure 4 is a front view of an air filtration device for a nuclear power plant in some embodiments of the present utility model;

[0023] The numbers in the accompanying drawings are as follows: 1. Filter unit; 11. Pollution-receiving layer; 12. Filter layer; 121. First filter element; 122. Second filter element; 13. Isolation layer; 131. Isolation element; 14. Shell; 15. Support member; 16. Sealing member; 17. Air inlet; 18. Air outlet; 2. Outer casing. DETAILED DESCRIPTION

[0024] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific embodiments of the present invention are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "up", "down", "left", "right", "longitudinal", "horizontal", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc. are based on the directions or positional relationships shown in the accompanying drawings and are constructed and operated in specific directions. They are only for the convenience of describing the present technical solution and do not indicate that the devices or components referred to must have specific directions. Therefore, they should not be understood as limiting the present invention.

[0025] It should also be noted that, unless otherwise clearly specified and limited, terms such as "installed", "connected", "connected", "fixed", and "set" should be understood in a broad sense. For example, they can be fixedly connected, detachably connected, or integrated; they can be mechanically connected or electrically connected; they can be directly connected or indirectly connected through an intermediate medium, and they can be internal connections between two elements or interactions between two elements. When an element is referred to as being "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or there may be one or more intervening elements. The terms "first", "second", and "third" are only used to facilitate the description of the present technical solution and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", and "third" can explicitly or implicitly include one or more of these features. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0026] Figures 1 to 3The air filter unit 1 in some embodiments of the present invention is shown, which is installed in an air filter device and is used for air purification in a nuclear power plant. Figure 2 As shown, Figure 2 This is a cross-sectional view of an air filter unit 1, which includes a housing 14, a dirt-receiving layer 11, and a filter layer 12, which are sequentially disposed within the housing 14. An air inlet 17 and an air outlet 18 are provided on opposite sides of the housing 14, respectively. The dirt-receiving layer 11 is located near the air inlet 17, and the filter layer 12 is located near the air outlet 18. The dirt-receiving layer 11 and the filter layer 12 form the filter element of the air filter unit 1. The housing 14 wraps around the edges of the filter element, providing protection, support, and preventing air from escaping from the edges of the filter element.

[0027] In some embodiments, the dirt-receiving layer 11 is composed of 5 to 15 stacked metal screens, the number of which can be 5, 8, 10, 12, 15, etc., with the filter meshes of adjacent metal screens arranged in a staggered pattern. The dirt-receiving layer 11 is used to isolate large particles, flying catkins, insects, etc. from the air.

[0028] like Figure 3 As shown, Figure 3 for Figure 2 In the partially enlarged view at point A, the filter layer 12, which plays the main filtering role, includes at least two filter elements arranged in sequence along the airflow direction. The filter element includes a metal filter plate, and the metal filter plate is provided with a number of filter holes (not shown) connecting the air inlet 17 and the air outlet 18. If there is only one filter element, all pollutants are blocked by the filter element, and its filter holes are blocked quickly, causing the air filter unit 1 to reach the final resistance prematurely. Furthermore, among the at least two filter elements, the pore size of the filter element near the air inlet 17 is larger than the pore size of the filter element near the air outlet 18, thereby performing graded blocking of substances of different sizes in the air. Large-sized substances are blocked by the filter element located upstream in the airflow direction, and small-sized substances are blocked by the filter element located downstream in the airflow direction. In this way, on the one hand, effective filtration can be achieved, and on the other hand, the service life of the air filter unit 1 can be increased, so that the air is fully in contact with the filter element, thereby more effectively capturing smaller particle dust and various suspended matter in the air, thereby improving the filtration accuracy.

[0029] The metal filter of the filter element can be a mesh wire structure, formed by interlacing multiple wires. The metal filter has a wavy cross-section, which increases its surface area, increases air flow, and can accommodate more filter material. Adjacent metal filter sheets have the same cross-sectional shape, or are arranged symmetrically.

[0030] In some embodiments, there are two filter elements, and the filter layer 12 includes a first filter element 121 near the air inlet 17 and a second filter element 122 near the air outlet 18. In the first filter element 121, the mesh size of the metal filter is 50-150 mesh, for example, 50 mesh, 80 mesh, 100 mesh, 120 mesh, 150 mesh, etc., and the wire diameter of the metal filter is 200-400 μm, for example, 200 μm, 250 μm, 300 μm, 350 μm, 400 μm, etc. The first filter element 121 is used to filter smaller particulate matter. In the second filter element 122, the metal filter has a mesh size of 200-300, such as 200, 230, 250, 270, or 300. The wire diameter of the metal filter is 10-150 μm, such as 10 μm, 50 μm, 100 μm, 120 μm, or 150 μm. The second filter element 122 is used to filter fine particulate matter. The two filter elements effectively filter particulate matter in the air.

[0031] The air filter unit 1 further comprises an isolation layer 13 disposed in the housing 14. The isolation layer 13 comprises a plurality of isolation members 131 arranged along the air flow direction. The isolation members 131 are provided with a plurality of through holes communicating with the air inlet 17 and the air outlet 18. Specifically, Figure 3 As shown, among the air inlet 17, the dirt-receiving layer 11, at least two filter elements and the air outlet 18, an isolating member 131 is provided between any two adjacent ones, that is, an isolating member 131 is provided between the air inlet 17 and the dirt-receiving layer 11, an isolating member 131 is provided between the dirt-receiving layer 11 and the filter element closest to the air inlet 17, an isolating member 131 is provided between any two adjacent filter elements, and an isolating member 131 is provided between the filter element closest to the air outlet 18 and the air outlet 18. Several isolating members 131 play a role in protecting and supporting the filter element of the air filter unit 1, and can prevent the air filter unit 1 from vibrating during operation and causing friction between the dirt-receiving layer 11 and the filter elements, while avoiding static electricity generated by friction. In some embodiments, as Figure 1 As shown, the isolation member 131 is a metal mesh partition, which is made of metal rods. The mesh shape of the isolation member 131 is diamond, rectangular or circular.

[0032] The air filter unit 1 further comprises two support members 15, which are respectively arranged on the air inlet 17 and the air outlet 18 of the housing 14. Specifically, the support member 15 comprises a plurality of support bars, which are arranged at intervals or crosswise, and the two ends of the support bars are connected to the outer edge of the air inlet 17 or the air outlet 18. In some embodiments, as Figure 1As shown, the support member 15 includes two support bars, which are cross-arranged on the air outlet 18. The two ends of the support bars are respectively connected to the corners at the diagonal positions of the inner edge of the housing 14 to form a triangular stabilization structure, thereby enhancing the stability of the air filter unit 1. In other embodiments, the two support bars can be cross-arranged on the air outlet 18 or the air inlet 17, and the two ends of the support bars are connected to the inner edge of the housing 14.

[0033] In some embodiments, air filter unit 1 is mounted on a wall having a plurality of reserved ventilation holes (not shown). Air inlet 17 or outlet 18 of air filter unit 1 corresponds to the plurality of ventilation holes. A metal mounting frame is provided around the ventilation holes on the wall. Air filter unit 1 is mounted within the metal mounting frame using fasteners. Thus, air filter unit 1 contacts the wall through the metal mounting frame, forming an indirect ground connection, thereby preventing the generation of static electricity.

[0034] The air filter unit 1 also includes a seal 16, which is arranged on the outer edge of one side of the shell 14, that is, the seal 16 surrounds the outer periphery of the air inlet 17 or the air outlet 18 arranged on the shell 14, and the inner side of the seal 16 is fixed to the shell 14. When the air filter unit 1 is installed on the wall, the outer side of the seal 16 contacts the wall to seal the space between the air filter unit 1 and the wall, which can prevent the air flow from passing through the area outside the air filter unit 1, thereby improving the filtration efficiency. Specifically, if the air filter unit 1 is installed in front of the wall, at this time, the air outlet 18 of the air filter unit 1 is facing the wall, then the seal 16 is set on the side of the air outlet 18, such as Figure 1 As shown, the air flow flows out from the air outlet 18 and then enters the vent; if the air filter unit 1 is installed behind the wall, the air inlet 17 of the air filter unit 1 is facing the wall, and the seal 16 is set on one side of the air inlet 17, so that the air flow enters the air inlet 17 through the vent.

[0035] The entire air filter unit 1 is made of metal. Compared to existing nuclear power plant air filters, which are made of fiber, metal is insoluble in water. When the air filter unit 1 reaches its final resistance, its components can be disassembled, cleaned, and reused, effectively reducing environmental pressure and lowering production costs. In some embodiments, the air filter unit 1 can be entirely made of 316 stainless steel.

[0036] The utility model also proposes an air filtration device for a nuclear power plant, such as Figure 4 As shown, Figure 4This is the air inlet 17 side of a nuclear power plant air filtration device. The air filtration device includes a housing 2 and the aforementioned air filtration units 1. There are at least two air filtration units 1 arranged in an array within the housing 2. When the air filtration device is mounted on a wall, the housing 2 is detachably connected to a metal mounting frame on the wall using fasteners. The air inlet 17 or air outlet 18 of the air filtration device corresponds to the vents in the wall.

[0037] In the nuclear power plant air filtration device and its air filtration unit 1 of the present invention, air enters the air filtration unit 1 from the air inlet 17, passes through the dirt-receiving layer 11 and the filter layer 12 in sequence, and is then discharged from the air outlet 18. The filter layer 12 includes at least two filter elements, which can achieve effective filtration on the one hand and increase the service life of the air filtration unit 1 on the other hand, so that the air is in full contact with the filter layer 12, thereby improving the filtration effect; the filter element includes a metal filter sheet, which can be reused by cleaning, and is simple to produce, lower in cost, and more environmentally friendly.

[0038] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0039] It can be understood that the above embodiments only express the preferred implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the present invention. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can be made, all of which fall within the scope of protection of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should fall within the scope of coverage of the claims of the present invention.

Claims

1. An air filter unit, characterized in that: The invention comprises a housing (14), and a dirt-receiving layer (11) and a filter layer (12) sequentially arranged in the housing (14); an air inlet (17) and an air outlet (18) are respectively provided on opposite sides of the housing (14); the dirt-receiving layer (11) is close to the air inlet (17), and the filter layer (12) is close to the air outlet (18); The filter layer (12) comprises at least two filter elements arranged in sequence along the air flow direction, wherein the filter element comprises a metal filter plate; the metal filter plate is provided with a plurality of filter holes communicating with the air inlet (17) and the air outlet (18).

2. The air filter unit according to claim 1, characterized in that The pore size of the filter pores of the filter element near the air inlet (17) is larger than the pore size of the filter pores of the filter element near the air outlet (18); and the metal filter sheet of the filter element is a mesh metal wire structure.

3. The air filter unit according to claim 2, characterized in that The filter layer (12) comprises a first filter element (121) close to the air inlet (17) and a second filter element (122) close to the air outlet (18); in the first filter element (121), the mesh number of the metal filter is 50-150 meshes, and the wire diameter of the metal wire of the metal filter is 200-400 μm; in the second filter element (122), the mesh number of the metal filter is 200-300 meshes, and the wire diameter of the metal wire of the metal filter is 10-150 μm.

4. The air filter unit according to claim 1, characterized in that The metal filter of the filter element is formed by interlacing and weaving a plurality of metal wires, and the cross section of the metal filter is wavy; the cross sections of adjacent metal filter sheets are the same, or the cross sections of adjacent metal filter sheets are symmetrically arranged.

5. The air filter unit according to claim 1, characterized in that The air filter unit (1) further comprises an isolation layer (13) disposed within the housing (14), the isolation layer (13) comprising a plurality of isolation members (131) arranged along the airflow direction, the isolation members (131) being provided with a plurality of through holes communicating with the air inlet (17) and the air outlet (18); the isolation member (131) is provided between any two adjacent ones of the air inlet (17), the dirt-receiving layer (11), at least two of the filter members, and the air outlet (18).

6. The air filter unit according to claim 5, characterized in that The isolating member (131) is a metal mesh partition plate, which is made of metal rods. The mesh shape of the isolating member (131) is rhombus, rectangle or circle.

7. The air filter unit according to claim 1, characterized in that The pollution-receiving layer (11) is composed of 5 to 15 stacked metal filter screens, and the filter mesh holes of adjacent metal filter screens are arranged in a staggered manner.

8. The air filter unit according to claim 1, characterized in that The air filter unit (1) further comprises two support members (15), the two support members (15) being respectively arranged on the air inlet (17) and the air outlet (18) of the housing (14); the support member (15) comprises a plurality of support bars, the plurality of support bars being arranged at intervals or crosswise, and the two ends of the support bars being connected to the outer edge of the air inlet (17) or the air outlet (18).

9. The air filter unit according to claim 1, wherein: The air filter unit (1) is mounted on a wall, and a plurality of vents are provided on the wall, wherein the air inlet (17) or the air outlet (18) corresponds to the vents; The air filter unit (1) further comprises a sealing member (16), which is arranged on an outer edge of one side of the housing (14), and the sealing member (16) contacts the wall to seal the space between the air filter unit (1) and the wall.

10. An air filtration device for a nuclear power plant, characterized in that: It comprises a housing (2) and an air filter unit (1) according to any one of claims 1 to 9, wherein the number of the air filter units (1) is at least two, and at least two of the air filter units (1) are arranged in an array within the housing (2).

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