Radon-removing daughter particle filter screen

Abstract

The utility model relates to the technical field of air purification, in particular to a radon daughter particulate matter removal filter screen, which aims at solving the technical problem of overcoming the defect of poor radon removal and purification effect in the prior art, and is mainly realized by the following technical scheme: the radon daughter particulate matter removal filter screen comprises a filter frame and a filter part, protective layers are arranged on the two outer sides of the filtering part, the filtering part comprises a front adsorption layer, a treatment layer and a rear adsorption layer, the front adsorption layer comprises a pre-filtering layer and a first adsorption layer, the treatment layer comprises a polymerization layer and a particulate matter filtering layer, each protective layer comprises two protective plates and two connecting plates, each protective plate comprises a V-shaped folded plate and a transverse plate, filtering holes are further formed in the transverse plate, and the filtering holes are communicated with the pre-filtering layer. The front adsorption layer adsorbs radon gas, the processing layer adsorbs radon daughters and radioactive aerosol particles, the rear adsorption layer adsorbs residual radon gas and radioactive iodine, and the filter frame and the protective layer are arranged to avoid ray leakage generated by decay under the condition that the filter effect is not affected.

Description

Technical Field

[0001] The utility model relates to the technical field of air purification, in particular to a radon daughter particle removal filter. Background Art

[0002] Radon is the only radioactive gas that exists naturally in nature. It is colorless and odorless, and accumulates unnoticed in the air where people live and work. It is produced during the decay of radioactive elements such as uranium and thorium, so granite, apatite and diabase rich in uranium and thorium are rich in radon gas. Radon deep in the strata can also diffuse into the atmosphere through geological fault zones and groundwater.

[0003] The harm of radon to human health mainly comes from internal radiation and external radiation. Internal radiation mainly comes from the decay of radioactive radiation in the air, thus forming a radioactive substance radon and its daughters. When acting on the human body, radon will quickly decay into radionuclides that can be absorbed by the human body, enter the human respiratory system, cause radiation damage, and induce lung cancer. External radiation mainly refers to the biological effect produced by the radioactive bodies in natural stone directly irradiating the human body, which will cause damage to the hematopoietic organs, nervous system, reproductive system and digestive system in the human body. At room temperature, radon and its daughters can form radioactive aerosols in the air to pollute the air, and are easily intercepted by the respiratory system, and continue to accumulate in local areas to cause damage to the human body.

[0004] Since radon is an inert gas, it cannot be filtered by catalytic oxidation, chemical adsorption and other methods, and can only be filtered by activated carbon adsorption. In addition, the half-life of radon is 3.8 days. At the same time, the short-lived daughters (218Po to 214Po) produced after radon decay are mainly free ions, which will quickly react with water vapor and air smoke to form small particle molecular clusters, which will then quickly attach to aerosol particles in the air to form combined radioactive aerosol particles. Therefore, in addition to filtering radon gas, the filter also needs to consider filtering radon daughter aerosol particles. Utility Model Content

[0005] Therefore, the technical problem to be solved by the utility model is to overcome the defect of poor radon removal and purification effect in the prior art, thereby providing a radon daughter particle removal filter.

[0006] The above technical objectives of the utility model are achieved through the following technical solutions:

[0007] A radon daughter particle filter net comprises a rectangular filter frame and a filter portion embedded in the filter frame, protective layers are further arranged on both sides of the filter portion, and the protective layers are also embedded in the filter frame, the filter portion comprises a front adsorption layer, a treatment layer and a rear adsorption layer arranged in sequence, the front adsorption layer comprises a pre-filtration layer and a first adsorption layer arranged in sequence, the treatment layer comprises a polymerization layer and a particle filter layer arranged in sequence, the polymerization layer is arranged on a side of the particle filter layer close to the first adsorption layer, and the rear adsorption layer is arranged on a side of the particle filter layer away from the polymerization layer.

[0008] By adopting the above technical scheme, when in use, the front adsorption layer can prevent large particles of dust from entering the filter and preliminarily adsorb radon gas. After the radon gas decays, the radon daughters are adsorbed by the treatment layer and aggregated into radioactive aerosol particles, which are adsorbed by the particle filter layer. The rear adsorption layer protects the air outlet surface and can adsorb residual radon gas and radioactive iodine generated by the treatment layer. A filter frame and a protective layer are set to protect the filter, and the radiation leakage generated by decay is avoided without affecting the filtering effect, so as to effectively treat and purify radon gas and radon daughter aerosol particles.

[0009] Furthermore, the pre-filtration layer is a filter cotton layer.

[0010] By adopting the above technical solution, the pre-filter layer uses low-resistance filter cotton, which can effectively block various large dust particles in the air, protect the first adsorption layer at the rear end, and prevent the activated carbon fiber of the first adsorption layer from accumulating too much large dust particles, thereby affecting the adsorption of radon gas.

[0011] Furthermore, the first adsorption layer and the post-adsorption layer are both activated carbon fiber layers.

[0012] By adopting the above technical solution, the microporous structure of the activated carbon fiber is extremely developed and can easily capture radon gas. Therefore, the first adsorption layer is set as the radon gas adsorption layer, and the rear adsorption layer adsorbs the residual radon gas at the outlet. The rear adsorption layer can also adsorb the iodine produced by the polymerization layer to prevent the release of radioactive iodine.

[0013] Furthermore, the polymer layer is a honeycomb activated carbon layer, the thickness of the polymer layer is greater than the thickness of the first adsorption layer, and the polymer layer is also sprayed with a pressure-sensitive adhesive.

[0014] By adopting the above technical solution, the polymer layer is high iodine value activated carbon particles and is filled in the honeycomb with pressure-sensitive adhesive sprayed on the surface. The pressure-sensitive adhesive allows the activated carbon particles to fully adhere to the honeycomb holes and is different from ordinary honeycomb filling. The activated carbon filling is more uniform. The honeycomb structure enables the smaller particle size polymerized radon daughters to collide and agglomerate in the holes of the activated carbon to form larger aerosol particles.

[0015] Furthermore, the particle filter layer is a polytetrafluoroethylene layer, the thickness of the particle filter layer is greater than the thickness of the polymer layer, and the particle filter layer includes a plurality of V-shaped structures connected in sequence, and the V-shaped structures are arranged in an array along the height direction of the particle filter layer.

[0016] By adopting the above technical solution, the particle filter layer arranged in multiple V-shaped structures can completely intercept radioactive aerosol particles.

[0017] Furthermore, the filter frame includes a metal frame and a baffle plate. The metal frame is rectangular and a filter groove is arranged in the middle. The baffle plate is also rectangular and embedded in the metal frame. The baffle plate is a lead plate and has a thickness of 10 mm.

[0018] By adopting the above technical solution, the metal frame and the baffle plate can block the α, β and γ rays generated in the decay process of the enriched radon and radon daughters.

[0019] Furthermore, protective layers are clamped on two opposite sides of the filter tank in the depth direction, and the protective layer on each side includes two protective plates and two connecting plates. The two protective plates are arranged in parallel with a gap between the two protective plates, and the connecting plates are respectively arranged at the top and bottom ends of the protective plates and connect and fix the top and bottom ends of the two protective plates.

[0020] By adopting the above technical solution, a protective layer is provided to protect the air inlet and outlet surfaces of the filter unit, and the protective layer provided with a double-layer structure can effectively block α, β and γ rays.

[0021] Furthermore, each of the protective plates includes a plurality of V-shaped folding plates arranged in an array along the height direction of the protective plates and a plurality of transverse plates arranged in an array along the height direction of the protective plates. The folding plates and the transverse plates are arranged intermittently, and the folding plates on two parallel protective plates are staggered. Filter holes are also provided on the transverse plates, and the filter holes are arranged along the length direction of the transverse plates and their width is less than the width of the transverse plates.

[0022] By adopting the above technical solution, the filter holes on the protective plate do not affect the air flow, and the normal use of the filter part can be guaranteed. The staggered filter holes can intensify the collision between radon progeny in the air to produce turbulence, so that the radon-containing particles are further aggregated and facilitate the adsorption of the aggregation layer.

[0023] In summary, the technical solution of the utility model has the following advantages:

[0024] 1. The utility model provides a radon daughter particle removal filter. The front adsorption layer can prevent large dust particles from entering the filter and preliminarily adsorb radon gas. After the radon gas decays, the radon daughters are adsorbed by the treatment layer and aggregated into radioactive aerosol particles, which are adsorbed by the particle filter layer. The rear adsorption layer protects the air outlet surface and can adsorb residual radon gas and radioactive iodine generated by the treatment layer, so as to effectively treat and purify radon gas and radon daughter aerosol particles.

[0025] 2. The radon daughter particle removal filter provided by the utility model is provided with a filter frame and a protective layer to protect the filter, thereby avoiding the leakage of radiation generated by decay without affecting the filtering effect, and ensuring the safety of the filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 This is a schematic diagram of the overall structure of a radon daughter particle removal filter provided in one embodiment of the utility model;

[0028] Figure 2 A cross-sectional view of a radon daughter particle removal filter provided in one embodiment of the utility model;

[0029] Figure 3 A schematic diagram of the partial structure of a protective layer provided in one embodiment of the utility model.

[0030] Description of reference numerals:

[0031] 1. Filter frame; 2. Metal frame; 21. Filter slot; 3. Blocking plate; 4. Filter part; 5. Protective layer; 51. Protective plate; 511. Folding plate; 512. Horizontal plate; 5121. Filter hole; 52. Connecting plate; 6. Front adsorption layer; 61. Pre-filtration layer; 62. First adsorption layer; 7. Treatment layer; 71. Aggregation layer; 72. Particle filtration layer; 721. V-shaped structure; 8. Rear adsorption layer. DETAILED DESCRIPTION

[0032] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0033] A radon daughter particle filter, such as Figure 1 and Figure 2 As shown, it includes a rectangular filter frame 1 and a filter part 4 embedded in the filter frame 1, and a protective layer 5 is also arranged on the left and right sides of the filter part 4, and the protective layer 5 is also embedded in the filter frame 1. The filter part 4 includes a front adsorption layer 6, a processing layer 7 and a rear adsorption layer 8 arranged from left to right, the front adsorption layer 6 includes a pre-filter layer 61 and a first adsorption layer 62, the processing layer 7 includes a polymer layer 71 and a particle filter layer 72, the polymer layer 71 is arranged on the left side of the particle filter layer 72, and the rear adsorption layer 8 is arranged on the right side of the particle filter layer 72. When in use, the front adsorption layer 6 can prevent large particles of dust from entering the filter and preliminarily adsorb radon gas. After the radon gas decays, the radon daughters are adsorbed by the treatment layer 7 and aggregated into radioactive aerosol particles, which are adsorbed by the particle filter layer 72. The rear adsorption layer 8 protects the air outlet surface and can adsorb residual radon gas and radioactive iodine produced by the treatment layer 7. The filter frame 1 and the protective layer 5 are provided to protect the filter, avoid the leakage of radiation produced by decay without affecting the filtering effect, and effectively treat and purify radon gas and radon daughter aerosol particles.

[0034] like Figure 2 As shown, the pre-filter layer 61 is a filter cotton layer. The pre-filter layer 61 uses low-resistance filter cotton, which can effectively block various large dust particles in the air, protect the first adsorption layer 62 at the rear end, and prevent the activated carbon fiber of the first adsorption layer 62 from accumulating too much large dust particles, thereby affecting the adsorption of radon gas.

[0035] The first adsorption layer 62 and the rear adsorption layer 8 are both activated carbon fiber layers. The microporous structure of activated carbon fiber is extremely developed and can easily capture radon gas. Therefore, the first adsorption layer 62 is set as the radon gas adsorption layer, and the rear adsorption layer 8 adsorbs the residual radon gas at the outlet. The rear adsorption layer 8 can also adsorb the iodine produced by the polymer layer 71 to prevent the release of radioactive iodine.

[0036] The polymer layer 71 is a honeycomb activated carbon layer, the thickness of the polymer layer 71 is greater than the thickness of the first adsorption layer 62, and the polymer layer 71 is also sprayed with a pressure-sensitive adhesive. The polymer layer 71 is high-iodine activated carbon particles and is filled in a honeycomb with a pressure-sensitive adhesive sprayed on the surface. The pressure-sensitive adhesive allows the activated carbon particles to fully adhere to the honeycomb holes and is different from ordinary honeycomb fillings. The activated carbon filling is more uniform. The honeycomb structure enables the polymerized radon daughters with smaller particle sizes to collide and agglomerate in the holes of the activated carbon to form larger aerosol particles.

[0037] The particle filter layer 72 is a polytetrafluoroethylene layer, the thickness of the particle filter layer 72 is greater than the thickness of the polymer layer 71, and the particle filter layer 72 includes a plurality of V-shaped structures 721 connected in sequence, and the V-shaped structures 721 are arranged in an array along the height direction of the particle filter layer 72. The particle filter layer 72 provided with a plurality of V-shaped structures 721 can completely intercept radioactive aerosol particles.

[0038] like Figure 1 and Figure 2 As shown, the filter frame 1 includes a metal frame 2 and a baffle plate 3. The metal frame 2 is rectangular and has a filter slot 21 extending through the middle. The baffle plate 3 is also rectangular and embedded in the metal frame 2. The baffle plate 3 is a lead plate with a thickness of 10 mm. Both the metal frame 2 and the baffle plate 3 can block the α, β and γ rays generated during the decay of the enriched radon and radon daughters.

[0039] like Figure 2 and Figure 3 As shown, the two sides opposite to each other in the depth direction of the filter tank 21 are connected with a protective layer 5, and each side of the protective layer 5 includes two protective plates 51 and two connecting plates 52. The two protective plates 51 are arranged vertically and parallelly with a gap between the two protective plates 51. The connecting plate 52 is respectively provided with the top and bottom ends of the protective plates 51 and connects and fixes the top and bottom ends of the two protective plates 51. The protective layer 5 is provided to protect the air inlet and outlet surfaces of the filter part 4. The protective layer 5 provided with a double-layer structure can effectively block α, β and γ rays.

[0040] Each protective plate 51 includes a plurality of V-shaped folding plates 511 arranged in an array along the height direction of the protective plate 51 and a plurality of transverse plates 512 arranged in an array along the height direction of the protective plate 51. The folding plates 511 and the transverse plates 512 are arranged intermittently, and the folding plates 511 on the two parallel protective plates 51 are staggered, that is, the folding plates 511 of the left protective plate 51 correspond to the transverse plates 512 of the right protective plate 51. Filter holes 5121 are provided on the transverse plates 512. The filter holes 5121 are arranged along the length direction of the transverse plates 512 and the width is less than the width of the transverse plates 512. The filter holes 5121 on the protective plate 51 do not affect the air flow, and can ensure the normal use of the filter unit 4. The staggered filter holes 5121 can intensify the collision between radon progeny in the air to produce turbulence, so that the radon-containing particles are further aggregated and facilitate the adsorption of the polymer layer 71.

[0041] The working principle and use method of the radon daughter particle filter net are as follows: the filter part 4 is fixed with a metal frame 2 and a two-component glue package is added to ensure the sealing of the filter as a whole; the pre-filter layer 61 is a low-resistance filter cotton layer, which can effectively block various large dust particles in the air and protect the first adsorption layer 62 at the rear end, so as to avoid the first adsorption layer 62 accumulating too many large dust particles and thus affecting the adsorption of radon gas; after the radon gas decays into radon daughters and is released, the polymerization layer 71 can aggregate the radon daughter molecules into release The particulate filter layer 72 is a polytetrafluoroethylene layer that can filter particulate matter efficiently and completely intercept radioactive aerosol particles. The rear adsorption layer 8 is added at the air outlet surface to adsorb residual radon gas at the outlet. The α, β and γ rays generated during the decay of the enriched radon and radon daughters are blocked and protected by the filter frame surrounding the filter part 4 and the protective layer 5 arranged on both sides of the filter part 4.

[0042] The above description shows and describes the preferred embodiments of the utility model. As mentioned above, it should be understood that the utility model is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the utility model concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not depart from the spirit and scope of the utility model, and should be within the scope of protection of the claims attached to the utility model.

Claims

1. A radon daughter particle removal filter, characterized in that: The invention comprises a rectangular filter frame (1) and a filter part (4) embedded in the filter frame (1); protective layers (5) are further arranged on both sides outside the filter part (4); the protective layers (5) are also embedded in the filter frame (1); the filter part (4) comprises a front adsorption layer (6), a treatment layer (7) and a rear adsorption layer (8) which are arranged in sequence; the front adsorption layer (6) comprises a pre-filtration layer (61) and a first adsorption layer (62) which are arranged in sequence; the treatment layer (7) comprises a polymer layer (71) and a particle filter layer (72) which are arranged in sequence; the polymer layer (71) is arranged on a side of the particle filter layer (72) close to the first adsorption layer (62); and the rear adsorption layer (8) is arranged on a side of the particle filter layer (72) away from the polymer layer (71).

2. A radon daughter particle removal filter according to claim 1, characterized in that: The pre-filter layer (61) is a filter cotton layer.

3. A radon daughter particle removal filter according to claim 2, characterized in that: The first adsorption layer (62) and the rear adsorption layer (8) are both activated carbon fiber layers.

4. A radon daughter particle removal filter according to claim 3, characterized in that: The polymer layer (71) is a honeycomb activated carbon layer. The thickness of the polymer layer (71) is greater than the thickness of the first adsorption layer (62). The polymer layer (71) is also sprayed with a pressure-sensitive adhesive.

5. A radon daughter particle removal filter according to claim 4, characterized in that: The particle filter layer (72) is a polytetrafluoroethylene layer, the thickness of the particle filter layer (72) is greater than the thickness of the polymer layer (71), the particle filter layer (72) comprises a plurality of V-shaped structures (721) connected in sequence, and the V-shaped structures (721) are arranged in an array along the height direction of the particle filter layer (72).

6. The radon daughter particle removal filter according to claim 1, characterized in that: The filter frame (1) comprises a metal frame (2) and a baffle plate (3); the metal frame (2) is rectangular and has a filter slot (21) arranged in the middle; the baffle plate (3) is also rectangular and is embedded in the metal frame (2); the baffle plate (3) is a lead plate and has a thickness of 10 mm.

7. A radon daughter particle removal filter according to claim 6, characterized in that: The filter tank (21) is provided with protective layers (5) on opposite sides in the depth direction, each side of the protective layer (5) comprises two protective plates (51) and two connecting plates (52), the two protective plates (51) are arranged in parallel and a gap is left between the two protective plates (51), and the connecting plates (52) are respectively provided with the top and bottom ends of the protective plates (51) and connect and fix the top and bottom ends of the two protective plates (51).

8. The radon daughter particle removal filter according to claim 7, characterized in that: Each of the protective plates (51) comprises a plurality of V-shaped folding plates (511) arranged in an array along the height direction of the protective plate (51) and a plurality of transverse plates (512) arranged in an array along the height direction of the protective plate (51); the folding plates (511) and the transverse plates (512) are arranged intermittently; the folding plates (511) on two parallel protective plates (51) are arranged in a staggered manner; and filtering holes (5121) are also provided on the transverse plates (512); the filtering holes (5121) are arranged along the length direction of the transverse plates (512) and have a width smaller than the width of the transverse plates (512).

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