A fume composite filter and a filter element assembly prepared using the same

Abstract

The present application relates to the technical field of oil fume filtration, in particular to an oil fume composite filter and a filter element assembly prepared using the same. A oil fume composite filter comprises a pleated support frame, wherein the pleated support frame is connected end to end to form a cavity; the cavity is filled with oil fume adsorbent cotton; the oil fume adsorbent cotton is made of hollow adsorbent staple fibers through a non-woven process; the hollow adsorbent staple fibers are made of the following raw materials in percentage by mass: 5-15% molecular sieve filler, 8-25% modified PAN-based carbon fiber chopped fibers, 1-3% dispersant, 1-3% anti-aging agent, and the remainder is a resin composition; the specification of the modified PAN-based carbon fiber chopped fibers is 1-3D, and the length is 0.05-0.2mm. The present application has good antibacterial and mildew-proof, oil fume adsorption effects, and is easy to clean and reuse.

Description

Technical Field

[0001] The present application relates to the technical field of oil fume filtration, and in particular to an oil fume composite filter and a filter element assembly prepared using the same. Background Art

[0002] Oil fume filters are mainly used for air conditioner oil fume filters, range hood oil fume filters, air purifier oil fume filters, etc. The oil fume filters need to be able to absorb oil fume particles and remove ammonia, isovaleric acid and other oil fume odors in the oil fume. In addition, they need to have certain antibacterial and mildew-proof effects so that they can be used for a longer period of time.

[0003] Currently, existing oil fume filters are made from a base mesh material and a post-processing agent. The base mesh material is made from hollow polyester yarns through a non-woven fabric processing process. The post-processing agent contains a binder, porous diatomaceous earth, and an antimicrobial agent. After being impregnated with the post-processing agent, the base mesh material adheres to the diatomaceous earth and antimicrobial agent, providing antibacterial properties, adsorbing oil fume particles, and removing ammonia, isovaleric acid, and other oil fume odors. The applicant's actual production research revealed the following deficiencies: Existing oil fume filters have a low oil fume adsorption capacity per unit volume, barely sufficient for household use but insufficient for industrial use. Maintaining high oil fume removal efficiency through replacement of the oil fume filter results in short maintenance cycles and frequent replacements, impacting production efficiency and resulting in high overall costs. These oil fume filters are only used by companies with stringent workplace environmental requirements. Existing oil fume filters have significant limitations, hindering their development. Summary of the Invention

[0004] In order to solve the above technical problems, the present application provides an oil fume composite filter and a filter element assembly prepared using the same.

[0005] In the first aspect, the present application provides a fume composite filter and a filter element assembly prepared using the same, which are achieved through the following technical solutions:

[0006] A fume composite filter screen comprises a pleated support frame, wherein the pleated support frame is connected end to end to form a cavity; the cavity is filled with fume adsorbent cotton; the fume adsorbent cotton is made of 18-30D hollow adsorbent staple fibers through a non-woven process; the hollow adsorbent staple fibers are made of the following raw materials in percentage by mass: 5-15% molecular sieve filler, 8-25% modified PAN-based carbon fiber chopped fibers, 1-3% dispersant, 1-3% anti-aging agent, and the balance is a resin composition; the modified PAN-based carbon fiber chopped fibers have a specification of 1-3D and a length of 0.05-0.2 mm; the resin composition comprises PP-R resin, EVA resin and PE resin, and the mass ratio of the PP-R resin, EVA resin and PE resin is controlled at (30-50): (5-10): (40-65); the expansion coefficient of the PP-R resin is 9-10.5*10 -5 *K -1 .

[0007] The oil fume filter produced by this application significantly improves the oil fume adsorption capacity per unit volume, meeting the needs of both domestic and industrial use. Its excellent oil fume removal efficiency and high oil fume adsorption capacity effectively extend maintenance cycles, reduce replacement frequency, and effectively minimize the impact on enterprise production efficiency, lowering the actual cost of use for enterprises, thus overcoming the limitations of existing oil fume filters. Furthermore, the PP-R resin in the resin composition has a relatively large expansion coefficient. The resulting oil fume composite filter facilitates the desorption of adsorbed oil fume substances when heated, resulting in rapid desorption efficiency and easy recycling.

[0008] Preferably, the hollow adsorption staple fiber is made of the following raw materials in the following mass percentages: 10-15% molecular sieve filler, 18-20% modified PAN-based carbon fiber chopped, 1-3% dispersant, 1-3% anti-aging agent, and the remainder is polyester chips; the anti-aging agent is at least one of antioxidant 168, antioxidant 1010, and black cubic boron nitride powder; the dispersant is at least one of KH540, KH550, KH560, KH570, and KH590; the hollow adsorption staple fiber is a 4-7 hole hollow adsorption staple fiber.

[0009] By optimizing the formula of hollow adsorption staple fibers, the oil fume adsorption capacity and oil fume removal efficiency per unit volume of the oil fume filter can be improved, which can further extend the maintenance cycle, reduce the replacement frequency, effectively reduce the impact on the company's production efficiency, reduce the company's actual use costs, and break through the limitations of existing oil fume filters.

[0010] Preferably, in the preparation method of the modified PAN-based carbon fiber chopped strands, the PAN-based carbon fiber filaments are subjected to electrochemical oxidation treatment after removing impurities, the PAN-based carbon fiber filaments are used as anodes, 0.5-2% nitrate solution is used as the electrolyte solution, the voltage of the anodic oxidation process is controlled to be 15-18 volts, the electrochemical oxidation treatment time is 5-8 minutes, the strands are taken out and dried, and cut into 0.05-0.2 mm PAN-based carbon fiber chopped strands.

[0011] The surface morphology of PAN (polyacrylonitrile)-based carbon fibers purchased on the market cannot be guaranteed to be consistent, resulting in inconsistent adsorption strength and poor quality stability of the prepared products. Therefore, in this application, the PAN-based carbon fibers are subjected to surface electrochemical oxidation treatment to improve the surface morphology consistency, reduce the adsorption strength difference coefficient, ensure the quality stability of the prepared oil fume composite filter, and improve the oil fume adsorption amount and oil fume removal efficiency per unit volume.

[0012] Preferably, in the preparation method of the modified PAN-based carbon fiber chopped strands, the PAN-based carbon fiber filaments are subjected to electrochemical oxidation treatment after impurities are removed, the PAN-based carbon fiber filaments are used as anodes, 0.5-2% nitrate solution is used as the electrolyte solution, the voltage of the anodic oxidation process is controlled to be 15-18 volts, the electrochemical oxidation treatment time is 5-8 minutes, and the PAN-based carbon fiber filaments are taken out and dried. The obtained PAN-based carbon fiber filaments are subjected to chemical vapor deposition or physical vapor deposition to deposit nano-manganese clusters on the surface of the PAN-based carbon fiber filaments, and the PAN-based carbon fiber chopped strands of 0.05-0.2 mm are cut.

[0013] By adopting the above technical solution, the quality stability of the prepared oil fume composite filter is guaranteed, the oil fume adsorption amount and oil fume removal efficiency per unit volume are improved, and the overall antibacterial and mildew-proof performance is further improved. Nano-manganese clusters can catalytically decompose VOC waste gas, which can further improve the oil fume removal efficiency, facilitate use by industrial enterprises, and help solve the problem of waste gas emissions.

[0014] Preferably, the mass ratio of the PP-R resin, EVA resin and PE resin is 40:6:54; the thickness of the oil fume adsorption cotton is 8-20mm, and the gram weight is 40-80g / m 2 .

[0015] By optimizing the mass ratio of PP-R resin, EVA resin and PE resin, the oil fume analysis efficiency can be further improved, which facilitates recycling and reduces the cost of use.

[0016] Preferably, the pleated support skeleton is mainly made of a base cloth and a setting liquid; the base cloth is made of hollow adsorbent staple fibers through a non-woven process; the hollow adsorbent staple fibers used in the base cloth are the same as the hollow adsorbent staple fibers used in the oil fume adsorbent cotton except for the specifications. The specifications of the hollow adsorbent staple fibers used in the base cloth are 3-12D; the specifications of the hollow adsorbent staple fibers used in the oil fume adsorbent cotton are 24-36D; the setting liquid is 20-40% aqueous epoxy resin solution, 3-5% hydroxyethyl acrylate, 5-10% molecular sieve filler, 1-3% nano aluminum nitride, and the balance is deionized water.

[0017] By adopting this technical solution, the pleated support frame not only provides support but also ensures good ventilation throughout the structure. This results in a relatively high total amount of oil fume gas processed per unit time, resulting in high oil fume adsorption efficiency. Furthermore, the pleated support frame itself possesses a certain degree of oil fume adsorption capacity, further enhancing the overall adsorption capacity.

[0018] Preferably, the method for preparing the pleated support frame comprises the following steps:

[0019] Step 1: Preparation of base fabric and setting liquid;

[0020] The base fabric is made of 3-12D hollow adsorption staple fibers through non-woven cotton processing technology;

[0021] Preparation of setting liquid: Disperse accurately measured water-based epoxy resin solution, molecular sieve filler, nano-aluminum nitride and deionized water evenly, then add hydroxyethyl acrylate and stir evenly to obtain setting liquid;

[0022] Step 2: Dip the base fabric into the setting liquid, transfer it to the squeezing roller to squeeze out the excess setting liquid in the base fabric, and then transfer it to the oven for pre-drying at 60-80°C for 20-40 minutes. Transfer it to the shaping roller and bend it to form pleats. After the pleat shaping is completed, cool it at 0-4°C for rapid cooling and shaping to obtain a semi-finished pleated support frame.

[0023] Step 3: Spray 5-8g / m2 on the upper and lower surfaces of the semi-finished pleated support frame after step 2. 2 The setting liquid prepared in step 1 is transferred to an oven and dried at 120-140° C. for 40-60 minutes. The moisture content is detected. When the moisture content is less than 2%, air-cooling is performed at room temperature for 5-10 minutes to obtain a finished pleated support skeleton.

[0024] The preparation method of the present application is relatively simple, easy to implement industrial production, and reduces the use cost.

[0025] In a second aspect, the present application provides a filter element assembly prepared using a fume composite filter screen, which is achieved through the following technical solutions:

[0026] A filter element assembly prepared using a fume composite filter screen includes an outer insulation tube and an inner heat transfer tube, wherein a self-limiting temperature heating layer is filled between the outer insulation tube and the inner heat transfer tube; the self-limiting temperature heating layer is composited from the inside to the outside with glass fiber mesh cloth, heat radiation reflecting metal paper, and porous insulation cotton located between the self-limiting temperature heating layer and the outer insulation tube; the fume composite filter screen is filled in the heat transfer tube.

[0027] By adopting the above-mentioned technical solution, the filter element assembly prepared in the present application not only has a large oil fume adsorption capacity, but also the filter element assembly can quickly analyze the adsorbed oil fume substances under the action of the heat generated by the self-limiting temperature heating layer. The analysis efficiency is relatively fast, which is convenient for recycling, and the analysis operation is relatively simple, which is convenient for users to perform analysis operations, and can effectively reduce the cost of use.

[0028] Preferably, an oil fume collecting assembly is provided in the heat transfer tube; the oil fume composite filter is filled between the oil fume collecting assembly and the inner wall of the heat transfer tube; the oil fume collecting assembly includes a collecting main pipe, a collecting branch pipe group, and a guide collecting pipe, the collecting branch pipe group is vertically fixed and connected to the collecting main pipe; the intervals between adjacent collecting branch pipe groups are equal; a single collecting branch pipe group includes at least four collecting branch pipes, and a plurality of through holes are opened through the surface of the collecting branch pipe; a plurality of guide grooves are opened on the surface of the collecting branch pipe along its own axis; the collecting branch pipes are vertically fixed and connected to the collecting main pipe, and the angles formed by adjacent collecting branch pipes are equal; the collecting branch pipes are in the same plane; one end of the guide collecting pipe is vertically fixed and connected to the middle part of the collecting main pipe, and the other end is successively penetrated by the oil fume composite filter, the inner heat transfer pipe, and the outer insulation pipe to extend to the outside of the outer insulation pipe, and the pipe end of the guide collecting pipe extending to the outside of the outer insulation pipe is connected to an external collecting bottle; the external collecting bottle is connected to an extraction device with a negative pressure extraction function.

[0029] During use, the diversion collection tube is sealed and not connected to the external collection bottle, or it can be disconnected from the collection bottle. When analysis is required, the diversion collection tube is connected to the external collection bottle via a control valve switch, or the collection bottle is connected externally, and the extraction device is activated. Under the action of the heat generated by the self-limiting temperature heating layer, the adsorbed oil fume substances can be quickly analyzed and enriched in the external collection bottle through the oil fume collection component for centralized processing. The analysis efficiency is relatively high, which is convenient for recycling. The analysis operation is relatively simple, which is convenient for users to perform analysis operations and can effectively reduce the cost of use.

[0030] Preferably, the end of the diversion collection pipe extending to the outside of the external insulation pipe is connected to a condensation pipe fitting; the condensation pipe fitting is connected to an external collecting bottle; the inner channel of the condensation pipe fitting is a spiral channel; the condensation pipe fitting includes an inner condensation pipe and an outer sleeve, the outer sleeve is detachably connected to the inner condensation pipe, and an interlayer chamber for storing a cooling medium is formed between the outer sleeve and the inner condensation pipe; the outer sleeve is connected to an external pipe for injecting a cooling medium into the interlayer chamber; the external pipe is sealed with a cover.

[0031] By adopting the above technical solution, it is easy to liquefy, collect and analyze the oil fume gas, improve the analysis efficiency, and facilitate recycling.

[0032] In summary, this application has the following advantages:

[0033] 1. The oil fume filter produced by this application has a significantly improved oil fume adsorption capacity per unit volume, which can meet the needs of household and industrial use. The good oil fume removal efficiency and large oil fume adsorption capacity effectively extend the maintenance cycle, reduce the replacement frequency, effectively reduce the impact on the company's production efficiency, and reduce the company's actual use cost, breaking through the limitations of existing oil fume filters.

[0034] 2. The oil fume composite filter prepared in the present application is conducive to the decomposition of the adsorbed oil fume substances under the action of heat, and the decomposition efficiency is relatively fast, which is convenient for recycling.

[0035] 3. The filter element assembly prepared in the present application not only has a large oil fume adsorption capacity, but also the filter element assembly can quickly analyze the adsorbed oil fume substances under the action of the heat generated by the self-limiting temperature heating layer. The analysis efficiency is relatively fast, which is convenient for recycling. The analysis operation is relatively simple, which is convenient for users to perform analysis operations and can effectively reduce the cost of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the overall structure of the oil fume composite filter in Example 1 of the present application.

[0037] Figure 2 It is a structural schematic diagram of the filter element assembly prepared using the oil fume composite filter in Example 1 of the present application.

[0038] Figure 3 This is a diagram showing the cross-sectional structure of the collecting branch pipe in the filter element assembly prepared using the oil fume composite filter in Example 1 of the present application.

[0039] Figure 4 It is a schematic diagram of the connection structure of the diversion collection tube, condensation pipe, external collection bottle, and extraction device in the filter element assembly prepared using the oil fume composite filter in Example 1 of the present application.

[0040] In the figure, 1. Pleated support frame; 11. Pleated support frame A; 12. Pleated support frame B; 2. Fume adsorbent cotton; 21. Fume adsorbent cotton A; 22. Fume adsorbent cotton B; 3. External insulation pipe; 4. Internal heat transfer pipe; 5. Self-limiting temperature heating layer; 51. Fiberglass mesh cloth; 52. Heat radiation reflecting metal paper; 53. Porous insulation cotton; 6. Fume collection assembly; 61. Collection main pipe; 62. Collection branch pipe group; 620. Collection branch pipe; 621. Through hole; 622. Guide wire trough; 63. Guide collection pipe; 7. Condensation pipe fitting; 70. External collecting bottle; 71. Internal condensation pipe; 72. Outer sleeve; 73. External pipe; 74. Sealing cover; 8. Extraction device. DETAILED DESCRIPTION

[0041] The present application is further described in detail below with reference to the accompanying drawings, comparative examples and embodiments.

[0042] Preparation Example

[0043] Preparation Example 1

[0044] The hollow adsorption staple fiber is made of the following raw materials in percentage by mass: 8% 4A molecular sieve powder (average particle size D50 = 0.4-3.0 microns), 8% modified PAN-based carbon fiber chopped short, 1.5% KH570 dispersant, 1% antioxidant 1010, 0.2% antioxidant 168, and the balance is resin composition. The resin composition is made of PP-R resin (with an expansion coefficient of 9 to 10.5*10 -5 *K -1 The mass ratio of PP-R resin, EVA resin and PE resin is 30:5:65.

[0045] The specification of the modified PAN-based carbon fiber chopped strands is 3D, and the length ranges from 0.05 to 0.08 mm.

[0046] The preparation method of hollow adsorption staple fibers comprises the following steps:

[0047] S1, preparation of modified PAN-based carbon fiber chopped strands: first select 3D PAN-based carbon fiber filaments, remove impurities from them, and then perform electrochemical oxidation treatment. The electrochemical oxidation treatment is specifically as follows: PAN-based carbon fiber filaments are used as anodes, 2% nitrate solution is used as electrolyte solution, the voltage of the anodic oxidation process is controlled to be 18V, the treatment time is 400s, the filaments are taken out and dried, and cut and sieved to obtain PAN-based carbon fiber chopped strands with a length of 0.05-0.08mm; at the same time, PP-R resin, EVA resin and PE resin are dried;

[0048] S2: The modified PAN-based carbon fiber chopped obtained in S1 is mixed and dispersed evenly with accurately measured 4A molecular sieve powder and KH570 dispersant, and then the dried PP-R resin, EVA resin, PE resin, antioxidant 168, and antioxidant 1010 are added, mixed and dispersed evenly to obtain a mixture;

[0049] S3, the mixed material is put into a twin-screw extruder, and the five temperature zones of the twin-screw extruder are as follows: the first temperature zone is heated at 130°C, the second temperature zone is heated at 145°C, the third temperature zone is heated at 155°C, the fourth temperature zone is heated at 155°C, and the fifth temperature zone is heated at 155°C, the extrusion die head temperature is 156°C, and the mixed material is extruded, cooled and granulated to obtain spinning masterbatch;

[0050] S4, the spinning masterbatch is put into the twin-screw extruder, the five temperature zones of the twin-screw extruder are as follows: the heating temperature of the first temperature zone is 140°C, the heating temperature of the second temperature zone is 150°C, the heating temperature of the third temperature zone is 165°C, the heating temperature of the fourth temperature zone is 165°C, and the heating temperature of the fifth temperature zone is 165°C. The extrusion die temperature is 165°C, and the molten material is extruded through the special-shaped spinneret with a spinneret hole diameter of 0.18±0.02mm. After cooling, a hollow adsorption staple fiber with a four-hole cross-section is obtained.

[0051] Preparation Example 2

[0052] The difference between Preparation Example 2 and Preparation Example 1 is that the mass ratio of PP-R resin, EVA resin and PE resin is 40:6:54.

[0053] Preparation Example 3

[0054] The difference between Preparation Example 3 and Preparation Example 1 is that the mass ratio of PP-R resin, EVA resin and PE resin is 50:10:40.

[0055] Preparation Example 4

[0056] The difference between Preparation Example 4 and Preparation Example 1 is that the hollow adsorption staple fiber is made of the following raw materials in the following mass percentages: 8% 4A molecular sieve powder, 16% modified PAN-based carbon fiber chopped fibers, 1.5% KH570 dispersant, 1% antioxidant 1010, 0.2% antioxidant 168, and the remainder is a resin composition.

[0057] Preparation Example 5

[0058] The difference between Preparation Example 5 and Preparation Example 1 is that the hollow adsorption staple fiber is made of the following raw materials in the following mass percentages: 8% 4A molecular sieve powder (average particle size D50 = 0.4-3.0 microns), 25% modified PAN-based carbon fiber chopped fibers, 1.5% KH570 dispersant, 1% antioxidant 1010, 0.2% antioxidant 168, and the remainder is a resin composition.

[0059] Preparation Example 6

[0060] The difference between Preparation Example 6 and Preparation Example 1 is that the hollow adsorption staple fiber is made of the following raw materials in the following mass percentages: 12% 4A molecular sieve powder, 20% modified PAN-based carbon fiber chopped, 1.8% KH570 dispersant, 1% antioxidant 1010, 0.2% antioxidant 168, 0.5% black cubic boron nitride powder, and the remainder is a resin composition.

[0061] Preparation Example 7

[0062] The difference between Preparation Example 7 and Preparation Example 1 is that the hollow adsorption staple fiber is made of the following raw materials in the following mass percentages: 8% 4A molecular sieve powder, 5% modified PAN-based carbon fiber chopped fibers, 1.5% KH570 dispersant, 1% antioxidant 1010, 0.2% antioxidant 168, and the remainder is a resin composition.

[0063] Preparation Example 8

[0064] The difference between Preparation Example 8 and Preparation Example 1 is that the hollow adsorption staple fiber is made of the following raw materials in the following mass percentages: 8% 4A molecular sieve powder, 28% modified PAN-based carbon fiber chopped fibers, 1.5% KH570 dispersant, 1% antioxidant 1010, 0.2% antioxidant 168, and the remainder is a resin composition.

[0065] Preparation Example 9

[0066] The difference between Preparation Example 9 and Preparation Example 1 is that the mass ratio of PP-R resin, EVA resin and PE resin is 20:4:76.

[0067] Preparation Example 10

[0068] The difference between Preparation Example 10 and Preparation Example 1 is that the mass ratio of PP-R resin, EVA resin and PE resin is 60:12:28.

[0069] Example

[0070] Example 1

[0071] refer to Figure 1 A fume composite filter screen comprises a pleated support frame 1, which is connected end to end to form a cavity, and the cavity is filled with fume adsorbent cotton 2. The fume adsorbent cotton 2 is made of the hollow adsorbent staple fibers in Preparation Example 1 through a non-woven process. The fume adsorbent cotton 2 has a thickness of 20 mm and a weight of 50 g / m2. 2 .

[0072] The pleated support frame 1 is made of a base fabric and a setting liquid. The base fabric is made of hollow adsorbent staple fibers using a non-woven process. The hollow adsorbent staple fibers used in the base fabric are identical to those used in the fume absorbent cotton 2 in Preparation Example 1, except for their specifications. The only difference is that the spinneret orifice diameter of the S4 special-shaped spinneret is 0.10±0.01 mm. The setting liquid is a 30% aqueous epoxy resin solution, 4% hydroxyethyl acrylate, 8% molecular sieve filler, 2% nano-aluminum nitride, and the balance is deionized water.

[0073] The preparation method of the pleat-shaped support frame 1 comprises the following steps:

[0074] Step 1: Preparation of base fabric and setting liquid;

[0075] The base fabric is hollow adsorbent staple fibers prepared by a special-shaped spinneret with a spinneret hole diameter of 0.10±0.01mm through a non-woven cotton processing process. The non-woven cotton processing process is the same as that for preparing oil fume adsorbent cotton.

[0076] Preparation of setting liquid: Disperse accurately measured water-based epoxy resin solution, molecular sieve filler, nano-aluminum nitride and deionized water evenly, then add hydroxyethyl acrylate and stir evenly to obtain setting liquid;

[0077] Step 2: The base fabric is dipped into the setting liquid, transferred through the extrusion roller, and hot extruded to set the thickness from 10 mm to 2 mm. At the same time, the excess setting liquid in the base fabric is squeezed out, and then transferred to the oven, pre-dried at 60 ° C for 30 minutes, and transferred to the shaping roller, bent to form pleats. After the pleat shaping is completed, it is cooled at 0-4 ° C for rapid cooling and setting to obtain a semi-finished pleated support frame;

[0078] Step 3: Spray 6g / m2 on the upper and lower surfaces of the semi-finished pleated support frame after step 2. 2 The setting liquid prepared in step 1 is transferred to an oven and dried at 128-130° C. for 60 min. The moisture content is detected. When the moisture content is less than 2%, air-cooling is performed at room temperature for 5 min to obtain a finished pleated support skeleton.

[0079] refer to Figure 2A filter element assembly using a fume composite filter screen includes an outer insulation tube 3 and an inner heat transfer tube 4. A self-limiting heating layer 5 is placed between the outer insulation tube 3 and the inner heat transfer tube 4. The self-limiting heating layer 5 can be made of a commercially available self-limiting heating cable or a self-limiting electric heating film developed by Wuxi Sangpu Electrical Technology Development Co., Ltd. In this embodiment, a commercially available self-limiting heating cable is preferred. The outer insulation tube 3 has a thickness of 0.8-1.5 mm and is made of polytetrafluoroethylene or Teflon. The inner heat transfer tube 4 has a thickness of 0.5-1 mm and is made of aluminum alloy. The inner diameter D can be adjusted based on the application. In this embodiment, the inner heat transfer tube 4 has an inner diameter D of 62 mm and an outer diameter D of 63 mm, with a length of 240 mm. In this embodiment, the outer insulation tube 3 has an inner diameter D of 76 mm and an outer diameter D of 77.3-77.5 mm, with a length of 240 mm.

[0080] refer to Figure 2 The self-limiting heating layer 5 is composed of a composite structure consisting of a fiberglass mesh 51, heat-reflecting metal paper 52, and porous insulation cotton 53, located between the inner heat transfer tube 4 and the outer insulation tube 3. The heat-reflecting metal paper 52 is 10-20 micron aluminum foil, which reflects heat radiation. The porous insulation cotton 53 is 8-12 mm thick polyurethane foam, which provides thermal insulation. A composite oil fume filter is placed inside the inner heat transfer tube 4.

[0081] refer to Figure 2 In this embodiment, the structure of the oil smoke composite filter filled in the inner heat transfer tube 4 is as follows:

[0082] The oil fume absorbent cotton 2 consists of oil fume absorbent cotton A21 and oil fume absorbent cotton B22. Oil fume absorbent cotton A21 has an outer diameter of 60 mm and an inner diameter of 60 mm, while oil fume absorbent cotton B22 has an outer diameter of 28 mm and an inner diameter of 12 mm. The pleated support frame 1 comprises pleated support frames A11 and B12, each 2 mm thick. Oil fume absorbent cotton B22 is sleeved onto the outer wall of the main collection pipe 61, with pleated support frame A11 wrapping around the outer surface of oil fume absorbent cotton A21, which in turn wraps around pleated support frame A11, and pleated support frame B12 wrapping around the outer surface of oil fume absorbent cotton B22.

[0083] refer to Figure 2 An oil fume collecting assembly 6 is provided in the inner heat transfer tube 4, and an oil fume composite filter is filled between the oil fume collecting assembly 6 and the inner wall of the inner heat transfer tube 4 to analyze the adsorbed oil fume particles and realize recycling.

[0084] refer to Figure 2The oil fume collection assembly 6 comprises a main collection pipe 61, three collection branch pipes 62, and a diversion collection pipe 63. The main collection pipe 61 is coaxial with the inner heat transfer pipe 4 and is sealed at both ends. The main collection pipe 61 is the same length as the inner heat transfer pipe 4, with an inner diameter D of 10 mm and an outer diameter D of 11 mm. It is made of polytetrafluoroethylene (PTFE) tubing. The collection branch pipes 62 are fixed perpendicularly to and connected to the main collection pipe 61 along its circumference. Adjacent collection branch pipes 62 are spaced evenly apart, with a spacing of 60 mm.

[0085] refer to Figure 2 Each branch collection tube group 62 contains six branch collection tubes 620, all located in the same plane. Branch collection tubes 620 are vertically fixed and connected to the main collection tube 61, and the angle (60°) formed by adjacent branch collection tubes 620 is equal. Branch collection tubes 620 have an inner diameter D = 5 mm, an outer diameter D = 6 mm, and a length of 26 mm.

[0086] refer to Figure 2 and Figure 3 To enhance the collection of desorbed gas, multiple through-holes 621 are formed on the surface of the collection branch pipe 620. Multiple guide grooves 622 are also formed along the axial direction of the collection branch pipe 620. One end of the guide grooves 622 is connected to the through-holes 621, facilitating the flow of desorbed gas or desorbed gas condensate into the collection main pipe 61.

[0087] refer to Figure 2 and Figure 4 One end of the diversion and collection pipe 63 is vertically fixed and connected to the middle of the main collection pipe 61. The other end of the diversion and collection pipe 63 passes through the oil fume composite filter, the inner heat transfer pipe 4, and the outer insulation pipe 3 in sequence, extending to the outside of the outer insulation pipe 3. During use, the diversion and collection pipe 63 extending outside the outer insulation pipe 3 is sealed with a sealing plug, or the end of the diversion and collection pipe 63 extending outside the outer insulation pipe 3 is connected to the condensation pipe 7, which has a control valve. The control valve is closed during use.

[0088] refer to Figure 2 and Figure 4 Condensation pipe 7 is fixedly connected to an external collecting bottle 70. The size of external collecting bottle 70 is customized according to actual needs. It stores a solvent for dissolving and analyzing oil fumes. The top of external collecting bottle 70 is connected to an extraction device 8 with a negative pressure extraction function. Extraction device 8 primarily performs negative pressure extraction on the oil fume collection assembly 6, transferring the oil fume analyzed by the oil fume composite filter in the internal heat transfer tube 4 to external collecting bottle 70. The specific type of extraction device 8 is not limited and can be selected according to actual design requirements.

[0089] refer to Figure 2 and Figure 4To facilitate the liquefaction, collection, and analysis of cooking fume, improving analysis efficiency, the inner channel of the condenser tube 7 is a spiral channel. This streamlines the flow of cooking fume within the condenser tube 7, effectively removing cooking fume particles. The condenser tube 7 comprises an inner condenser tube 71 and an outer sleeve 72 detachably connected to the inner condenser tube 71. When connected, the outer sleeve 72 and the inner condenser tube 71 form an interlayer chamber for storing cooling medium. The outer sleeve 72 is connected to an outer pipe 73 for injecting cooling medium into the interlayer chamber. The outer pipe 73 is sealed with a cap 74.

[0090] When the analysis operation is required, pull out the sealing plug on the diversion collection pipe 63 extending to the outside of the outer insulation pipe 3, connect the condensation pipe 7 to the diversion collection pipe 63, open the control valve on the condensation pipe 7, connect the condensation pipe 7 to the diversion collection pipe 63, connect the self-limiting temperature heating layer 5 to the power supply and heat it to 120-140°C, turn on the extraction device 8, and the oil fume composite filter can quickly analyze the adsorbed oil fume substances under the action of the heat generated by the self-limiting temperature heating layer 5, and enrich them in the external collection bottle 70 for centralized treatment through the oil fume collection component 6.

[0091] When the analysis operation is required, the condensation pipe 7 and the diversion collection pipe 63 are already connected. It is only necessary to open the control valve, connect the power supply to the self-limiting temperature heating layer 5 and heat it to 80°C, turn on the extraction device 8, and the oil fume composite filter can quickly analyze the adsorbed oil fume substances under the action of the heat generated by the self-limiting temperature heating layer 5, and enrich them in the external collection bottle 70 for centralized treatment through the oil fume collection component 6.

[0092] The above two modes respond to different application scenarios, and products can be designed according to actual needs.

[0093] Example 2

[0094] The difference between Example 2 and Example 1 is: S1, preparation of modified PAN-based carbon fiber chopped strands: first select 3D PAN-based carbon fiber filaments, perform impurity removal treatment, and then perform electrochemical oxidation treatment. The electrochemical oxidation treatment is specifically as follows: PAN-based carbon fiber filaments are used as anodes, 2% nitrate solution is used as electrolyte solution, the voltage of the anodic oxidation process is controlled to be 18V, the treatment time is 400s, and the PAN-based carbon fiber filaments are taken out and dried. The obtained PAN-based carbon fiber filaments are subjected to physical vapor deposition technology to deposit nano-manganese clusters on the surface of the PAN-based carbon fiber filaments. The deposition amount of nano-manganese clusters is controlled to be 2% of the total mass of the PAN-based carbon fiber filaments. PAN-based carbon fiber chopped strands with a length of 0.05-0.08mm are obtained by cutting and screening.

[0095] Example 3

[0096] The difference between Example 3 and Example 1 is that the hollow adsorbent staple fibers in Preparation Example 1 are replaced by the hollow adsorbent staple fibers in Preparation Example 2.

[0097] Example 4

[0098] The difference between Example 4 and Example 1 is that the hollow adsorbent staple fibers in Preparation Example 1 are replaced by the hollow adsorbent staple fibers in Preparation Example 3.

[0099] Example 5

[0100] The difference between Example 5 and Example 1 is that the hollow adsorbent staple fibers in Preparation Example 1 are replaced by the hollow adsorbent staple fibers in Preparation Example 4.

[0101] Example 6

[0102] The difference between Example 6 and Example 1 is that the hollow adsorption staple fibers in Preparation Example 1 are replaced by the hollow adsorption staple fibers in Preparation Example 5.

[0103] Example 7

[0104] The difference between Example 7 and Example 1 is that the hollow adsorbent staple fibers in Preparation Example 1 are replaced by the hollow adsorbent staple fibers in Preparation Example 6.

[0105] Comparative Example

[0106] The difference between Comparative Example 1 and Example 1 is that the hollow adsorbent staple fibers in Preparation Example 1 are replaced by the hollow adsorbent staple fibers in Preparation Example 7.

[0107] The difference between Comparative Example 2 and Example 1 is that the hollow adsorbent staple fibers in Preparation Example 1 are replaced by the hollow adsorbent staple fibers in Preparation Example 8.

[0108] The difference between Comparative Example 3 and Example 1 is that the hollow adsorbent staple fibers in Preparation Example 1 are replaced by the hollow adsorbent staple fibers in Preparation Example 9.

[0109] The difference between Comparative Example 4 and Example 1 is that the hollow adsorbent staple fibers in Preparation Example 1 are replaced by the hollow adsorbent staple fibers in Preparation Example 10.

[0110] Comparative Example 5

[0111] The difference between Comparative Example 5 and Example 1 is that the oil fume adsorbent cotton 2 is replaced by a conventionally prepared oil fume filter. The oil fume filter is made of a base mesh material and a post-finishing agent. The base mesh material is made of 3D hollow polyester yarn through a non-woven fabric processing technology. The thickness and gram weight of the conventional oil fume filter are the same as those of the oil fume adsorbent cotton 2. The post-finishing agent is 25% aqueous polyurethane emulsion, 10% diatomaceous earth with a porous structure, 1% antibacterial agent-2-n-octyl-4-isothiazoline-3-one, and the balance is deionized water. The method of treating the base mesh material with the post-finishing agent is similar to steps two and three in the preparation method of the pleated support skeleton in this application.

[0112] Performance testing

[0113] Detection method / test method

[0114] 1. Adsorption Strength Test: A unit volume of oil fume composite filter was assembled into a filter element assembly. Specifications for the filter element assembly are as follows: the inner heat transfer tube 4 has an inner diameter (D) of 62 mm and an outer diameter (D) of 63 mm, with a length of 240 mm. The outer insulation tube 3 has an inner diameter (D) of 76 mm and an outer diameter (D) of 77.3-77.5 mm, with a length of 240 mm. The fiberglass mesh 51 is 1 mm thick; the heat radiation reflective metal paper 52 is 12-micron aluminum foil; and the porous insulation cotton 53 is 12 mm thick polyurethane foam. The main collecting pipe 61 is the same length as the inner heat transfer tube 4, with an inner diameter (D) of 10 mm and an outer diameter (D) of 11 mm, and is made of polytetrafluoroethylene (PTFE). The branch collecting pipe 620 has an inner diameter (D) of 5 mm, an outer diameter (D) of 6 mm, and a length of 26 mm, and is made of polytetrafluoroethylene (PTFE). Adjacent branch collecting pipes 62 are spaced 60 mm apart. The volume of oil smoke adsorption cotton 2 is 616.3cm 3 (The volume occupied by the collecting branch pipe group 62 is excluded from the calculation).

[0115] i: Test gas containing oil smoke and oil smoke particles is continuously introduced into the filter element assemblies of Examples 1-7 and Comparative Examples 1-5. The oil smoke content in the test gas is 38-40 mg / m 3 The content of oil smoke particles is 78-80mg / m 3 When the oil smoke content in the filtered gas is greater than 1mg / m 3 Or the oil smoke particle content is greater than 3mg / m 3 , it is considered that the test filter element component is adsorbed saturated, and the weight difference ΔM before and after the test filter element component is adsorbed saturated.

[0116] ΔM = mass M2 of the saturated filter element assembly after adsorption - mass M1 of the filter element assembly before adsorption.

[0117] ii: The oil smoke content in the test gas containing oil smoke and oil smoke particles is 18-20mg / m 3 The content of oil smoke particles is 28-30mg / m 3 , continue to introduce the above-mentioned gas into the filter element components of Examples 1-7 and Comparative Examples 1-5, with a total amount of 20m 3 , the gas flow rate is 2m / s, and the oil fume content A and oil fume particle content B of the filtered gas are detected.

[0118] iii: Test gas containing oil smoke and oil smoke particles. The oil smoke content is 18-20mg / m 3 The content of oil smoke particles is 28-30mg / m 3 , continue to introduce the above-mentioned gas into the filter element components of Examples 1-7 and Comparative Examples 1-5, with a total amount of 20m 3, the gas flow rate is 4m / s, and the oil fume content a and oil fume particle content b of the filtered gas are detected.

[0119] 2. Desorption performance test: After 20 desorption cycles, test the overall adsorption strength again. For adsorption strength, refer to the adsorption strength test in test method 1.

[0120] Data Analysis

[0121] Table 1 is the test parameters of Examples 1-7 and Comparative Examples 1-5 before analysis

[0122]

[0123] Table 2 is the adsorption intensity test parameters of Examples 1-7 and Comparative Examples 1-5 after 20 analyses

[0124]

[0125]

[0126] Combining Examples 1-7 and Comparative Examples 1-5 and Table 1-2, it can be seen that the adsorption performance of Example 1 is better than that of Comparative Example 5, and after 20 analyses, Example 1 still has good adsorption performance, but Comparative Example 5 still cannot meet the detection standards and is a substandard product. Therefore, the filter element assembly prepared in this application has a good oil fume adsorption effect, is easy to clean and repeatedly recycled, and reduces the cost of use.

[0127] Combining Examples 1-7 and Comparative Examples 1-5 and Table 1-2, it can be seen that the initial performance of Example 1 is similar to that of Example 2 from the comparison of Example 1 and Example 2; from the comparison of the ΔM data after 20 analyses, Example 2 is superior, and the B and b test contents of Example 2 are also relatively reduced. Therefore, the oil fume adsorption cotton prepared by depositing nano-manganese clusters on the surface of PAN-based carbon fiber filaments has good antibacterial and mildew-proof properties and good oil fume adsorption effect, and is easy to analyze, clean and repeatedly reuse, and after 20 analyses, the oil fume adsorption cotton still has a good oil fume adsorption effect.

[0128] Combining Examples 1-7 with Comparative Examples 1-5 and Table 1-2, it can be seen that the initial performance of Examples 1, 3-4 is similar to that of Comparative Examples 3-4. However, after 20 desorption cycles, the adsorption performance of Examples 1, 3-4 is superior to that of Comparative Examples 3-4. Therefore, the overall performance of the oil fume adsorption cotton prepared by controlling the mass ratio of PP-R resin, EVA resin, and PET resin within 30-50:5-10:40-65 is superior. The preferred embodiment is a mass ratio of PP-R resin, EVA resin, and PET resin of 40:6:54.

[0129] Combining Examples 1-7 with Comparative Examples 1-5 and Table 1-2, it can be seen that the adsorption performance of Example 6 is greater than that of Example 5, which is greater than that of Example 1, which is greater than that of Comparative Example 1. Although the adsorption performance of Example 6 is slightly lower than that of Comparative Example 2, the difference between the two is small. The adsorption performance of Example 6 is also not much different from that of Example 1. Therefore, considering the overall cost and adsorption performance, the oil fume adsorption cotton produced by 8-25% modified PAN-based carbon fiber chopped fibers has better overall performance. The preferred solution is 18-20% modified PAN-based carbon fiber chopped fibers.

[0130] Combining Examples 1-7 and Comparative Examples 1-5 and Table 1-2, it can be seen that the adsorption performance of Example 7 is better than that of Examples 5-6, and after 20 analyses, Example 7 can still maintain a good adsorption effect. Therefore, the technical solution of Example 7 is the best implementation scheme.

[0131] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A composite oil fume filter, characterized by: The invention comprises a pleated support frame (1), wherein the pleated support frame (1) is connected end to end to form a cavity; the cavity is filled with oil fume adsorption cotton (2); the oil fume adsorption cotton (2) is made of hollow adsorption staple fibers through a non-woven process; the hollow adsorption staple fibers are made of the following raw materials in percentage by mass: 5-15% molecular sieve filler, 8-25% modified PAN-based carbon fiber short chops, 1-3% dispersant, 1-3% anti-aging agent, and the remainder is a resin composition; the specification of the modified PAN-based carbon fiber short chops is 1-3D, and the length is 0.05-0.2mm; the resin composition comprises PP-R resin, EVA resin and PE resin, and the mass ratio of the PP-R resin, EVA resin and PE resin is controlled to be (30-50): (5-10): (40-65); the expansion coefficient of the PP-R resin is 9-10.5*10 -5 *K -1 .

2. The oil fume composite filter according to claim 1, characterized in that: The modified PAN-based carbon fiber chopped strands are prepared by removing impurities from the PAN-based carbon fiber filaments and then subjecting them to electrochemical oxidation treatment. The PAN-based carbon fiber filaments serve as anodes, a 0.5-2% nitrate solution serves as an electrolyte, and the voltage of the anodic oxidation process is controlled at 15-18 volts. The electrochemical oxidation treatment lasts for 5-8 minutes. The strands are then taken out, dried, and cut into 0.05-0.2 mm PAN-based carbon fiber chopped strands.

3. The oil fume composite filter according to claim 1, characterized in that: The modified PAN-based carbon fiber chopped strands are prepared by electrochemically oxidizing the PAN-based carbon fiber filaments after removing impurities. The PAN-based carbon fiber filaments serve as anodes, and a 0.5-2% nitrate solution is used as an electrolyte. The voltage of the anodic oxidation process is controlled at 15-18 volts. The electrochemical oxidation treatment lasts for 5-8 minutes. The PAN-based carbon fiber filaments are then removed and dried. Nanomanganese clusters are deposited on the surface of the PAN-based carbon fiber filaments through chemical vapor deposition or physical vapor deposition, and the PAN-based carbon fiber chopped strands are cut to obtain 0.05-0.2 mm PAN-based carbon fiber filaments.

4. The oil fume composite filter according to claim 2 or 3, characterized in that: The mass ratio of the PP-R resin, EVA resin and PE resin is 40:6:54; the thickness of the oil smoke adsorption cotton (2) is 8-20mm, and the gram weight is 40-80g / m 2 .

5. The oil fume composite filter according to claim 4, characterized in that: The pleated support frame (1) is mainly made of a base fabric and a setting liquid; the base fabric is made of hollow adsorbent staple fibers through a non-woven process; the hollow adsorbent staple fibers used in the base fabric are the same as the hollow adsorbent staple fibers used in the oil fume adsorbent cotton (2) except for the specifications. The specifications of the hollow adsorbent staple fibers used in the base fabric are 3-12D; the specifications of the hollow adsorbent staple fibers used in the oil fume adsorbent cotton (2) are 24-36D; the setting liquid is 20-40% of an aqueous epoxy resin solution, 3-5% of hydroxyethyl acrylate, 5-10% of a molecular sieve filler, 1-3% of nano-aluminum nitride, and the balance is deionized water.

6. The oil fume composite filter according to claim 5, characterized in that: The preparation method of the pleated support frame (1) comprises the following steps: Step 1: Preparation of base fabric and setting liquid; The base fabric is made of 3-12D hollow adsorption staple fibers through non-woven cotton processing technology; Preparation of setting liquid: Disperse accurately measured water-based epoxy resin solution, molecular sieve filler, nano-aluminum nitride and deionized water evenly, then add hydroxyethyl acrylate and stir evenly to obtain setting liquid; Step 2: Dip the base fabric into the setting liquid, transfer it to the squeezing roller to squeeze out the excess setting liquid in the base fabric, and then transfer it to the oven for pre-drying at 60-80°C for 20-40 minutes. Transfer it to the shaping roller and bend it to form pleats. After the pleat shaping is completed, cool it at 0-4°C for rapid cooling and shaping to obtain a semi-finished pleated support frame. Step 3: Spray 5-8g / m2 on the upper and lower surfaces of the semi-finished pleated support frame after step 2. 2 The setting liquid prepared in step 1 is transferred to an oven and dried at 120-140°C for 40-60 minutes. The moisture content is detected. When the moisture content is less than 2%, it is air-cooled at room temperature for 5-10 minutes to obtain a finished pleated support skeleton.

7. A filter element assembly prepared using the oil fume composite filter according to any one of claims 1 to 6, characterized in that: The invention comprises an outer heat-insulating tube (3) and an inner heat-transfer tube (4); a self-limiting temperature heating layer (5) is filled between the outer heat-insulating tube (3) and the inner heat-transfer tube (4); the self-limiting temperature heating layer (5) is composited from the inside to the outside with a glass fiber mesh cloth (51), a heat radiation reflecting metal paper (52), and a porous heat-insulating cotton (53) located between the inner heat-transfer tube (4) and the outer heat-insulating tube (3); and the oil fume composite filter according to any one of claims 1 to 6 is filled in the inner heat-transfer tube (4).

8. The filter element assembly according to claim 7, characterized in that: An oil fume collecting assembly (6) is provided in the inner heat transfer tube (4); the oil fume composite filter according to any one of claims 1 to 6 is filled between the oil fume collecting assembly (6) and the inner wall of the inner heat transfer tube (4); the oil fume collecting assembly (6) comprises a collecting main pipe (61), a collecting branch pipe group (62), and a diversion collecting pipe (63); the collecting branch pipe group (62) is vertically fixed and connected to the collecting main pipe (61); the intervals between adjacent collecting branch pipe groups (62) are equal; a single collecting branch pipe group (62) comprises at least four collecting branch pipes (620), and a plurality of through holes (621) are opened through the surface of the collecting branch pipe (620); the surface of the collecting branch pipe (620) is provided with a plurality of through holes (621); the surface of the collecting branch pipe (620) is provided with a plurality of through holes (621) A plurality of guide grooves (622) are provided in the axial direction of the pipe itself; the collecting branch pipe (620) is vertically fixed and connected to the collecting main pipe (61), and the angles formed by adjacent collecting branch pipes (620) are equal; the collecting branch pipes (620) are in the same plane; one end of the guide collecting pipe (63) is vertically fixed and connected to the middle of the collecting main pipe (61), and the other end is successively penetrated by the oil fume composite filter, the inner heat transfer pipe (4), and the outer insulation pipe (3) and extends to the outside of the outer insulation pipe (3); the pipe end of the guide collecting pipe (63) extending to the outside of the outer insulation pipe (3) is connected to an external collecting bottle (70); the external collecting bottle (70) is connected to an extraction device (8) with a negative pressure exhaust function.

9. The filter element assembly according to claim 8, characterized in that: The end of the guide collecting pipe (63) extending to the outside of the external insulation pipe (3) is connected to a condensing pipe fitting (7); the condensing pipe fitting (7) is connected to the external collecting bottle (70); the inner channel of the condensing pipe fitting (7) is a spiral channel; the condensing pipe fitting (7) includes an inner condensing pipe (71) and an outer sleeve (72), the outer sleeve (72) is detachably connected to the inner condensing pipe (71), and an interlayer chamber for storing a cooling medium is formed between the outer sleeve (72) and the inner condensing pipe (71); the outer sleeve (72) is connected to an external pipe (73) for injecting a cooling medium into the interlayer chamber; the external pipe (73) is sealed and connected to a cover (74).

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