An exchange core of a fresh air system and a fresh air system

Abstract

The application relates to the technical field of fresh air control, and discloses an exchange core body of a fresh air system and the fresh air system. The exchange core body comprises a plurality of exchange core bodies which are stacked and distributed in a layered manner. The exchange core body comprises a polymer base layer and a flocked layer arranged on at least one side of the polymer base layer. The flocked layer is arranged on the polymer base layer through an adhesive layer. The polymer base layer is internally provided with a first channel for gas exchange. There is a stacking gap between adjacent exchange core bodies, a second channel for passing fluid is formed, and the surface of the flocked layer is in contact with the fluid. According to the application, the flocked layer is obtained by flocking of flocking fibers. The raw materials for preparing the flocking fibers include 100 parts of fibers, 10-30 parts of polylactic acid copolymer and 5-15 parts of mildew-proof agent. The exchange core body can realize air exchange between indoor and outdoor air, realize rapid cooling, has high heat exchange effect, and can avoid great influence of the fluid on indoor humidity.

Description

Technical Field

[0001] This invention relates to the technical field of fresh air control, and more particularly to an exchange core and a fresh air system. Background Technology

[0002] In the current field of indoor air improvement technology, fresh air systems have become an important device for improving indoor air quality. In particular, fresh air systems with heat exchange functions aim to achieve efficient replacement of indoor and outdoor air while minimizing excessive loss of indoor heat and humidity due to air exchange, thereby reducing energy consumption and improving indoor environmental comfort.

[0003] The main component of a fresh air system is the exchange core. By setting up non-intersecting air intake and exhaust channels within the exchange core, indoor air is exhausted to the outside through the exhaust channel, while fresh outdoor air, filtered and introduced into the room through the intake channel, achieves air exchange. Simultaneously, the incoming fresh air absorbs energy from the exhaust air through heat transfer, achieving heat exchange. Currently, fresh air systems can use evaporative cooling technology to achieve both heat and fresh air exchange, demonstrating advantages such as energy efficiency, high efficiency, and environmental friendliness. However, in actual operation, the water evaporation rate is relatively slow, resulting in less than ideal heat exchange efficiency, increased energy consumption, and low efficiency. Furthermore, using the principle of water evaporation to absorb heat and lower the fresh air temperature results in water vapor being mixed into the fresh air during evaporation, inevitably increasing indoor humidity, especially in humid environments, leading to undesirable indoor humidity levels. These issues limit the overall effectiveness of fresh air systems using evaporative cooling technology in improving indoor air quality. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an exchange core and a fresh air system that can perform heat exchange while achieving air exchange, and has high heat exchange efficiency and minimal impact on indoor air humidity.

[0005] To address the aforementioned technical problems, the first aspect of the present invention provides an exchange core for a fresh air system. The fresh air system has a first inlet for introducing fluid and a second inlet for introducing gas. The exchange core is used to filter the gas and fluid introduced into the fresh air system. The exchange core includes a plurality of exchange core bodies stacked in a layered distribution. Each exchange core body includes a polymer base layer and a flocked layer disposed on at least one side of the polymer base layer. The flocked layer is disposed on the polymer base layer through an adhesive layer. The interior of the polymer base layer has a first channel for gas exchange. There are stacking gaps between adjacent exchange core bodies to form a second channel for introducing fluid, so that the surface of the flocked layer is in contact with the fluid. The flocked layer, by weight, is obtained by flocking fibers, and the raw materials for preparing the flocked fibers include 100 parts of fiber, 10-30 parts of polylactic acid copolymer, and 5-15 parts of antifungal agent.

[0006] As an improvement to the above solution, the weight of the flocked layer is 50 g / m². 2 -100g / m 2 The flocked fibers in the flocked layer have a length of 0.2mm-1mm and a fineness of 1D-3D.

[0007] As an improvement to the above solution, in the exchange core, adjacent exchange core bodies are stacked in a direction perpendicular to the airflow path in the first channel; The outlet of the second channel is not connected to the outlet of the first channel, so that the fluid and gas can work independently through different paths.

[0008] As an improvement to the above solution, the fluid is water and air, and the fiber is a hydrophilic fiber, which is one or more of bamboo fiber, cotton fiber, silk fiber, viscose fiber, and polyamide fiber. The polylactic acid copolymer is one or more of the following: polyvinyl alcohol-polylactic acid copolymer, polylactic acid-polyglycolic acid copolymer, polylactic acid-polyethylene glycol-polylactic acid triblock copolymer, polylactic acid-polycaprolactone copolymer, and polylactic acid-polyamino acid copolymer. The antifungal agent is one or more of silver ions, chitosan, chitosan derivatives, and quaternary ammonium salts.

[0009] As an improvement to the above scheme, the hydrophilic fiber is bamboo fiber and polyamide fiber, and the weight ratio of bamboo fiber to polyamide fiber is 0.05:1-0.3:1; The polylactic acid copolymer is a polyvinyl alcohol-polylactic acid copolymer; The antifungal agent is a quaternary ammonium salt, which is a quaternary ammonium salt containing halogenated hydrocarbons.

[0010] As an improvement to the above solution, the method for preparing the flocked fibers includes: The polylactic acid copolymer and the antifungal agent were mixed in an organic solvent, a catalyst was added, and the temperature was maintained at 40℃-80℃ for 12h-48h to obtain the modified polylactic acid copolymer. Hydrophilic fibers are mixed with modified polylactic acid copolymers to obtain a preparation solution for flocking layers, which is then spun into flocking fibers.

[0011] As an improvement to the above scheme, the organic solvent is one or more of anhydrous dimethyl sulfoxide, N,N-dimethylamide, tetrahydrofuran, and acetone; The catalyst is one or more of potassium carbonate, sodium carbonate, triethylamine, and pyridine; The thickness of the adhesive layer is 0.03%-0.07% of the thickness of the polymer base layer; The adhesive layer is a polyurethane adhesive layer.

[0012] As an improvement to the above solution, the flocking layer is disposed on the polymer base layer via an adhesive layer, comprising: The surface of the polymer base layer is modified to obtain a modified surface, and then an adhesive layer and a flocking layer are formed on the modified surface. The modification treatment is either PP water treatment or corona treatment.

[0013] As an improvement to the above solution, the treatment temperature of the PP water is 45℃-55℃, the mass concentration of the PP water is 5%-10%, and the treatment time is 40s-90s. The corona treatment was performed at a temperature of 20℃-35℃, a linear velocity of 15m / min-30m / min, and a corona value of 10W·min / m. 2 -50W·min / m 2 .

[0014] A second aspect of the present invention also provides a fresh air system, including the aforementioned exchange core.

[0015] Implementing this invention has the following beneficial effects: In this application, a flocked layer is provided on a polymer base layer. The polymer base layer has a first channel for gas exchange inside, and there is a stacking gap between adjacent exchange core bodies to form a second channel for fluid to enter. This allows the surface of the flocked layer to contact the fluid. The flocked structure on the flocked layer can be used to increase the contact area between the fluid and the flocked layer, which is conducive to the rapid evaporation of the fluid on the flocked layer, achieving a rapid cooling effect. The heat exchange efficiency is high, and it also avoids the fluid and gas using the same channel to enter the room. The fluid and fresh air work independently through different paths, effectively reducing the impact of the fluid on the indoor humidity. Attached Figure Description

[0016] Figure 1 : A schematic diagram of the structure of a switching core in this invention; Figure 2: A physical image of a switching core according to the present invention; Figure 3: A schematic diagram of the structure of a switching core body in this invention.

[0017] Figure label: 10-Exchange core body; 110-Polymer base layer; 120-Flocking layer; 130-Adhesive layer; 140-First channel; 150-Second channel. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the present invention clearer, specific embodiments will be described in further detail below.

[0019] In the description of this application, it is necessary to understand that the orientation or positional relationship indicated by terms such as "upper", "lower", "top", "bottom", "inner", and "outer" are based on the orientation or positional relationship shown in the accompanying drawings. The purpose is only to facilitate the description of the present invention and to simplify the description, and is not intended to indicate or imply that the component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the invention.

[0020] To address the aforementioned problems, the first aspect of this invention provides an exchange core for a fresh air system. The fresh air system has a first inlet for introducing fluid and a second inlet for introducing gas. The exchange core is used to filter the gas and fluid introduced into the fresh air system. (See also...) Figure 1 - Figure 3 shows that the exchange core includes a plurality of exchange core bodies 10 stacked in a layered distribution. Each exchange core body 10 includes a polymer base layer 110 and a flocked layer 120 disposed on at least one side of the polymer base layer 110. The flocked layer 120 is disposed on the polymer base layer 110 through an adhesive layer 130. The interior of the polymer base layer 110 has a first channel 140 for gas exchange. There are stacking gaps between adjacent exchange core bodies 10 to form a second channel 150 for fluid to pass through, so that the surface of the flocked layer 120 is in contact with the fluid.

[0021] In this application, a flocked layer 120 is provided on a polymer base layer 110. The polymer base layer 110 has a first channel 140 for gas exchange inside. There is a stacking gap between adjacent exchange core bodies 10 to form a second channel 150 for fluid to enter, so that the surface of the flocked layer 120 is in contact with the fluid. The flocked structure on the flocked layer 120 can be used to increase the contact area between the fluid and the flocked layer, which is conducive to the rapid evaporation of the fluid on the flocked layer 120, achieving a rapid cooling effect. The heat exchange effect is high, and it also avoids the fluid and gas using the same channel to enter the room. The fluid and fresh air work independently through different paths, effectively reducing the impact of the fluid on the indoor humidity.

[0022] Furthermore, flocked layers 120 are provided on both sides of the polymer base layer 110. In the exchange core, adjacent exchange core bodies 10 are stacked in a direction perpendicular to the airflow path in the first channel 140, so that the gas in the first channel 140 of the spaced-apart exchange core bodies 10 has the same airflow path, and the inlet of the first channel 140 of the spaced-apart exchange core bodies 10 is connected to the second inlet, so that the fresh air entering the room and the air exhausted from the room are parallel and do not intersect. It can be understood that multiple parallel baffles can be equally spaced in the first channel 140 to form multiple ventilation channels in the first channel 140, which improves the energy exchange efficiency and the uniformity of airflow distribution, and also enhances the structural strength, reduces the pressure drop, and improves the energy exchange performance and durability of the exchange core.

[0023] Furthermore, the inlet of the second channel 150 is connected to the first inlet, while the outlet of the second channel 150 is not connected to the outlet of the first channel 140. This allows the fluid and gas to operate independently through different pathways, preventing fluid from entering the room and further reducing the fluid's impact on indoor humidity. Preferably, the fluid is water, which has good temperature regulation performance. Understandably, a small amount of air can also be introduced into the second channel 150 to facilitate rapid fluid penetration into the flocked layer 120.

[0024] Preferably, the polymer base layer 110 has good mechanical properties to ensure the structural integrity and stability of the exchange core under external forces, different temperatures, and different humidity conditions. The material of the polymer base layer 110 includes, but is not limited to, polypropylene (PP). An adhesive layer 130 is provided between the polymer base layer 110 and the flocked layer 120, so that the flocked layer 120 is disposed on the polymer base layer 110 through the adhesive layer 130. This increases the bonding strength between the polymer base layer 110 and the flocked layer 120, preventing the flocked fibers of the flocked layer 120 from falling off under external forces.

[0025] Further, the flocking layer 120 being disposed on the polymer base layer 110 via the adhesive layer 130 includes: modifying the surface of the polymer base layer 110 to obtain a modified surface, and then disposing the adhesive layer 130 and the flocking layer 120 on the modified surface. Since the polymer base layer 110 has a low surface energy, modifying its surface introduces active groups and increases surface roughness, which helps to increase the penetration and bonding of the adhesive in the adhesive layer 130 on the surface, thereby increasing the adhesion of the adhesive layer 130 to the polymer base layer 110. Optionally, the modification treatment can be performed using PP water treatment or corona treatment. For example, when using PP water treatment, the treatment temperature is 45℃-55℃, the PP water mass concentration is 5%-10%, and the treatment time is 40s-90s; when using corona treatment, the temperature is 20℃-35℃, the linear velocity is 15m / min-30m / min, and the corona value is 10W·min / m. 2 -50W·min / m 2 .

[0026] Furthermore, the thickness of the adhesive layer 130 is 0.03%-0.07% of the thickness of the polymer base layer 110. The flocked layer 120 has good adhesion to the polymer base layer 110, is not easy to fall off, and has minimal energy transfer loss between the flocked layer 120 and the polymer base layer 110. In some specific and preferred embodiments, the thickness of the polymer base layer 110 is 20mm-40mm, and the thickness of the adhesive layer 130 is 10μm-20μm.

[0027] Optionally, the adhesive layer 130 is a polyurethane adhesive layer, which can be applied to the polymer base layer 110 by spraying, brushing, or other means. Polyurethane adhesives have good affinity with the polymer base layer 110 and the flocked fibers, resulting in high bonding strength. More importantly, the surface of the polymer base layer 110 and the flocked fibers will absorb water and swell under long-term humid conditions, causing dimensional changes. The polyurethane adhesive can buffer the stress caused by these dimensional changes, reducing the risk of flocked fibers falling off.

[0028] Preferably, the flocked layer 120 is obtained by flocking flocked fibers, and the weight of the flocked layer 120 is 50 g / m². 2 -100g / m 2 The flocked layer 120 has a large specific surface area, which promotes fluid evaporation and rapid heat exchange. It also exhibits good adhesion to the polymer base layer 110, strong resistance to fluids and gases, and good durability. If the basis weight of the flocked layer 120 is less than 50 g / m²... 2If the flocked fibers in the flocked layer 120 are relatively sparse or short, the evaporation area provided is relatively small, resulting in low heat exchange efficiency; if the basis weight of the flocked layer 120 is greater than 100 g / m², the evaporation area provided is relatively small. 2 High density or long length of flocked fibers can increase the contact area with the fluid, allowing for more complete evaporation and the absorption or release of more heat. However, this also increases the fluid flow resistance, negatively impacting the overall heat exchange efficiency. More preferably, the flocked layer 120 has a basis weight of 70 g / m². 2 -80g / m 2 .

[0029] Furthermore, the flocked fibers in the flocked layer 120 have a length of 0.2mm-1mm and a fineness of 1D-3D, resulting in low wind resistance and a large specific surface area. This facilitates rapid evaporation and cooling of the fluid, reducing indoor and outdoor temperatures. It also prevents a large amount of fluid from accumulating in the flocked layer 120 and being transferred to the polymer base layer 110 through the adhesive layer 130, thus avoiding a significant increase in indoor humidity. It should be noted that the fineness of the flocked fibers in this invention refers to the weight (g) of a 1000-meter-long flocked fiber; that is, a flocked fiber fineness of 1D-3D means that a 1000-meter-long flocked fiber weighs 1g-3g.

[0030] The fluid used in this invention is water, which can be flowing water or water vapor. Driven by introduced air, it passes uniformly through the flocked layer 120. However, prolonged contact between the flocked layer 120 and the fluid easily breeds bacteria, mold, and other microorganisms. Furthermore, under the impact of the fluid, it can detach from the polymer base layer 110, reducing heat exchange efficiency and shortening the service life of the exchange core. Therefore, the raw materials of the flocked layer 120 need to be optimized. Preferably, by weight, the raw materials for preparing the flocked fiber include 100 parts fiber, 10-30 parts polylactic acid copolymer, and 5-15 parts antifungal agent. The synergistic effect of the fiber, polylactic acid copolymer, and antifungal agent can increase the hydrophilicity and antibacterial properties of the flocked layer 120, promote the penetration and wetting of the fluid on the flocked layer 120, thereby increasing the evaporation area of ​​the fluid and extending the service life of the exchange core.

[0031] Preferably, the fiber is a hydrophilic fiber. Hydrophilic fibers can further increase the evaporation area of ​​the fluid on the flocked layer 120, and also play a certain role in regulating indoor humidity. The hydrophilic fiber is one or more of bamboo fiber, cotton fiber, silk fiber, viscose fiber, polyamide (PA) fiber, polyacrylonitrile fiber, and polyester fiber; more preferably, the hydrophilic fiber is bamboo fiber and polyamide fiber. Bamboo fiber has certain antibacterial properties, which can reduce the growth of bacteria and mold in the flocked layer 120, while polyamide fiber has high strength and wear resistance, ensuring the stability of the flocked fiber. The combination of bamboo fiber and polyamide fiber as the main body of the flocked fiber not only has good hydrophilicity, allowing more fluid to wet the flocked layer 120 and evaporate quickly, rapidly transferring temperature to the polymer base layer 110, effectively reducing the temperature of the air in the polymer base layer 110, achieving a rapid decrease in indoor temperature, reducing the moisture that penetrates into the room through the flocked layer 120, maintaining indoor humidity within a small range, and also maintaining good mechanical properties, and has antibacterial function. Optionally, the polyamide fibers may be, for example, PA1010, PA6, PA66, PA610, PA11, PA12, PA612, etc.

[0032] Furthermore, the weight ratio of bamboo fiber to polyamide fiber is 0.05:1-0.3:1. If the amount of bamboo fiber added is too small, it will reduce the hydrophilicity of the flocking layer 120, reduce the temperature exchange efficiency of the fresh air system, and increase the probability of mold and bacteria growing on the flocking layer 120. However, if the amount of bamboo fiber added is too large, it will cause the flocking fiber to be unable to be successfully adsorbed onto the surface of the flocked object during the flocking process, and reduce the quality of the flocking layer 120.

[0033] In this invention, the polylactic acid copolymer is compounded with hydrophilic fibers to adjust the size and distribution of pores, forming a suitable pore network. This facilitates rapid fluid transport within the pores, replenishes evaporated water, and maintains a continuous cooling effect. Preferably, the polylactic acid copolymer is a copolymer with hydrophilic segments, making the surface of the flocked layer 120 easier to wet with water, forming a uniform water film. This helps water spread and evaporate rapidly on the surface of the flocked layer 120, thereby improving evaporative cooling efficiency. The polylactic acid copolymer is selected from one or more of polyvinyl alcohol-polylactic acid copolymer, polylactic acid-polyglycolic acid copolymer, polylactic acid-polyethylene glycol-polylactic acid triblock copolymer, polylactic acid-polycaprolactone copolymer, and polylactic acid-polyamino acid copolymer.

[0034] Furthermore, the polylactic acid copolymer is a polyvinyl alcohol-polylactic acid copolymer. The polyvinyl alcohol (PVA) segments can interact with water molecules, making the entire copolymer hydrophilic, while the polylactic acid (PLA) segments exhibit certain hydrophobicity, which facilitates combination with antifungal agents and improves the antibacterial properties of the flocked layer 120.

[0035] Furthermore, the antifungal agent is one or more of silver ions, chitosan, chitosan derivatives, and quaternary ammonium salts; preferably, the antifungal agent is a quaternary ammonium salt, more preferably a quaternary ammonium salt containing halogenated hydrocarbons. The quaternary ammonium salt containing halogenated hydrocarbons can be bonded to the polyvinyl alcohol-polylactic acid copolymer through multiple active sites such as -OH and -COOH contained in the polyvinyl alcohol-polylactic acid copolymer. Simultaneously, it can also be adsorbed onto the polyvinyl alcohol-polylactic acid copolymer using electrostatic interactions, allowing the polylactic acid copolymer to exhibit a certain encapsulation and protective effect on the quaternary ammonium salt, forming an antibacterial slow-release effect, further extending the service life of the exchange core in the fresh air system. Furthermore, the addition of quaternary ammonium salts to the system imparts a positive charge to the surface of the bamboo fibers, promoting their suspension and directional movement in an electrostatic field. This allows the fibers to be better adsorbed onto the adhesive layer 130 according to the direction of the electric field, thereby improving the operability of the bamboo fibers during the electrostatic flocking process. It also reduces microbial contamination between the flocking layer 120 and the polymer base layer 110 or the adhesive layer 130, resulting in more firmly attached fibers to the adhesive layer 130 after flocking. Examples of the quaternary ammonium salts containing halogenated hydrocarbons include benzyltrimethylammonium chloride, hexadecyltrimethylammonium bromide, dodecyldimethylbenzylammonium chloride, and dioctadecyldimethylammonium chloride, but these are not limited to these.

[0036] In some specific and preferred embodiments, the method for preparing the flocked fibers includes: (1) Mix polylactic acid copolymer and antifungal agent in organic solvent, add catalyst, maintain temperature at 40℃-80℃ and react for 12h-48h to obtain modified polylactic acid copolymer; (2) The hydrophilic fiber is mixed with the modified polylactic acid copolymer to obtain the preparation solution of flocking layer 120, and flocking fiber is formed by spinning.

[0037] Optionally, the organic solvent in step (1) is one or more of anhydrous dimethyl sulfoxide (DMSO), N,N-dimethylamide (DMF), tetrahydrofuran (THF), and acetone, and the mass ratio of the polylactic acid copolymer to the organic solvent is 1:(7-12).

[0038] Optionally, the catalyst in step (1) is selected from one or more of potassium carbonate, sodium carbonate, triethylamine, and pyridine, and the mass ratio of the catalyst to the quaternary ammonium salt is 1:(0.1-0.3).

[0039] The present invention will be further described below with reference to specific embodiments: Example 1 This embodiment provides an exchange core for a fresh air system. The fresh air system has a first inlet for fluid and a second inlet for gas. The exchange core filters the gas and fluid introduced into the fresh air system. The exchange core includes multiple exchange core bodies stacked in a layered distribution. Each exchange core body includes a polymer base layer and flocked layers disposed on both sides of the polymer base layer. The flocked layers are attached to the polymer base layer by an adhesive layer. The polymer base layer has a first channel for gas exchange inside. There are stacking gaps between adjacent exchange core bodies, forming a second channel for fluid to enter, so that the surface of the flocked layers is in contact with the fluid. In the exchange core, adjacent exchange core bodies are stacked in a direction perpendicular to the airflow path in the first channel. The outlet of the second channel is not connected to the outlet of the first channel. The fluid is water.

[0040] The polymer base layer is a PP layer with a thickness of 30mm. The adhesive layer is a polyurethane adhesive layer (Felix-2260, Panjin Yilikaitai New Material Co., Ltd.) with a thickness of 15μm. The flocked fibers in the flocked layer have a length of 0.5mm, a fineness of 1.5D, and a basis weight of 75g / m². 2 .

[0041] The flocking layer is disposed on the polymer base layer by means of an adhesive layer: the surface of the PP layer is modified by PP water to obtain a modified surface, then an adhesive layer is disposed on the modified surface, and finally flocking fibers are electrostatically flocked on the adhesive layer to obtain the flocking layer.

[0042] The raw materials for preparing the flocked fiber, by weight, include 100 parts of fiber, 10 parts of polylactic acid copolymer, and 5 parts of antifungal agent. The fiber is PA66 fiber, the polylactic acid copolymer is polyethylene glycol-polylactic acid copolymer, and the antifungal agent is silver ions.

[0043] It is prepared by the following method: (1) The polylactic acid copolymer and the antifungal agent were mixed in anhydrous dimethyl sulfoxide, a catalyst was added, the temperature was kept at 65°C and the reaction was carried out for 24 hours to obtain the modified polylactic acid copolymer. (2) PA66 fiber is mixed with modified polylactic acid copolymer to obtain the preparation solution for flocking layer, and flocking fiber is formed by spinning; This embodiment also provides a fresh air system, including the aforementioned exchange core.

[0044] Example 2 This embodiment provides an exchange core for a fresh air system, which is basically the same as that in Embodiment 1, except that: The raw materials for preparing the flocked fiber include 100 parts of hydrophilic fiber, 20 parts of polylactic acid copolymer, and 10 parts of mildew inhibitor. The hydrophilic fiber is bamboo fiber and PA66 fiber, with a ratio of 0.15:1 between the bamboo fiber and PA66 fiber.

[0045] The antifungal agent is a quaternary ammonium salt, and the quaternary ammonium salt is dioctadecyldimethylammonium chloride.

[0046] This embodiment also provides a fresh air system, including the aforementioned exchange core.

[0047] Example 3 This embodiment provides an exchange core for a fresh air system, which is basically the same as that in Embodiment 2, except that: The adhesive layer has a thickness of 10 μm, the flocked fibers in the flocked layer have a length of 1 mm, a fineness of 1D, and a basis weight of 50 g / m². 2 .

[0048] This embodiment also provides a fresh air system, including the aforementioned exchange core.

[0049] Comparative Example 1 This comparative example provides an exchange core for a fresh air system, which is basically the same as that in Example 1, except that: The raw materials for preparing the flocked fiber, by weight, include 100 parts of hydrophilic fiber and 10 parts of antifungal agent.

[0050] This comparative example also provides a fresh air system, including the aforementioned exchange core.

[0051] Performance testing 1. Place the exchange core (306.5mm*306.5mm*3.0mm) obtained in the examples and comparative examples into the equipment, and test the temperature and relative humidity of the air flowing out of the exchange core. The test conditions include intermittent water spraying in the second channel, with each spray lasting 2 minutes and an interval of 17 minutes; the actual air volume is 150m³ / h. 3 / h, actual exhaust air volume is 300m³ / h. 3 / h.

[0052] The test results are shown in Table 1 below.

[0053] Table 1. Test results of heat exchange in the examples and comparative examples.

[0054] As can be seen from the above results, the exchange core includes multiple exchange core bodies stacked in a layered distribution. Gas exchange is achieved in the first channel in the polymer base layer. There are stacking gaps between adjacent exchange core bodies to form a second channel for fluid to enter, so that the surface of the flocked layer comes into contact with the fluid. This facilitates the rapid evaporation of the fluid on the flocked layer, achieving a rapid cooling effect and improving the heat exchange efficiency.

[0055] 2. The anti-mold performance and flocking fastness of the exchange cores obtained in the examples and comparative examples were tested. The test results are shown in Table 2.

[0056] Anti-mildew performance: The suspension method in GB / T 24346-2009 "Evaluation of anti-mildew performance of textiles" was used. After inoculation, the sample to be tested was suspended in a constant temperature and humidity chamber (60% humidity, 27℃). After 28 days of cultivation, the growth of mold was observed and rated according to the area of ​​mold growth on the sample surface. Flocking fastness: Characterized by abrasion resistance performance, in accordance with GB / T21196.2-2007 "Textiles - Martindale Method - Determination of Abrasion Resistance of Fabrics - Part 2: Test for Specimen Breakage".

[0057] Table 2. Test results of antibacterial and adhesive properties of the examples and comparative examples.

[0058] The results above show that the exchange core includes multiple exchange core bodies stacked in a layered distribution. Gas exchange is achieved in the first channel in the polymer base layer. There are stacking gaps between adjacent exchange core bodies to form a second channel for fluid to enter, so that the surface of the flocked layer comes into contact with the fluid. Optimizing the raw materials, length, fineness and weight of the flocked fibers in the flocked layer can significantly improve the anti-mildew performance of the flocked layer, increase the flocking firmness of the flocked layer on the adhesive layer, make it less likely to fall off under external impact, and extend the durability of the exchange core.

[0059] The above description is merely a preferred embodiment of the present invention and should not be construed as limiting the scope of the invention. Therefore, any equivalent variations made in accordance with the claims of the present invention are still within the scope of the present invention.

Claims

1. An exchange core for a fresh air system, the fresh air system having a first inlet for introducing fluid and a second inlet for introducing gas, the exchange core being used to filter the gas and fluid introduced into the fresh air system, characterized in that, The exchange core includes multiple exchange core bodies stacked in a layered distribution. Each exchange core body includes a polymer base layer and a flocked layer disposed on at least one side of the polymer base layer. The flocked layer is disposed on the polymer base layer through an adhesive layer. The interior of the polymer base layer is provided with a first channel for gas exchange. There are stacking gaps between adjacent exchange core bodies to form a second channel for fluid to enter, so that the surface of the flocked layer is in contact with the fluid. The flocked layer, by weight, is obtained by flocking fibers, and the raw materials for preparing the flocked fibers include 100 parts of fiber, 10-30 parts of polylactic acid copolymer, and 5-15 parts of antifungal agent.

2. The exchange core of the fresh air system as described in claim 1, characterized in that, The flocked layer has a weight of 50 g / m². 2 -100g / m 2 The flocked fibers in the flocked layer have a length of 0.2mm-1mm and a fineness of 1D-3D.

3. The exchange core of the fresh air system as described in claim 1, characterized in that, In the exchange core, adjacent exchange core bodies are stacked in a direction perpendicular to the airflow path in the first channel; The outlet of the second channel is not connected to the outlet of the first channel, so that the fluid and gas can work independently through different paths.

4. The exchange core of the fresh air system as described in claim 1, characterized in that, The fiber is a hydrophilic fiber, which is one or more of bamboo fiber, cotton fiber, silk fiber, viscose fiber, and polyamide fiber. The polylactic acid copolymer is one or more of the following: polyvinyl alcohol-polylactic acid copolymer, polylactic acid-polyglycolic acid copolymer, polylactic acid-polyethylene glycol-polylactic acid triblock copolymer, polylactic acid-polycaprolactone copolymer, and polylactic acid-polyamino acid copolymer. The antifungal agent is one or more of silver ions, chitosan, chitosan derivatives, and quaternary ammonium salts.

5. The exchange core of the fresh air system as described in claim 4, characterized in that, The hydrophilic fiber is bamboo fiber and polyamide fiber, and the weight ratio of bamboo fiber to polyamide fiber is 0.05:1-0.3:1; The polylactic acid copolymer is a polyvinyl alcohol-polylactic acid copolymer; The antifungal agent is a quaternary ammonium salt, which is a quaternary ammonium salt containing halogenated hydrocarbons.

6. The exchange core of the fresh air system as described in claim 4 or 5, characterized in that, The method for preparing the flocked fibers includes: The polylactic acid copolymer and the antifungal agent were mixed in an organic solvent, a catalyst was added, and the temperature was maintained at 40℃-80℃ for 12h-48h to obtain the modified polylactic acid copolymer. Hydrophilic fibers are mixed with modified polylactic acid copolymers to obtain a preparation solution for flocking layers, which is then spun into flocking fibers.

7. The exchange core of the fresh air system as described in claim 1, characterized in that, The organic solvent is one or more selected from anhydrous dimethyl sulfoxide, N,N-dimethylamide, tetrahydrofuran, and acetone; The catalyst is one or more of potassium carbonate, sodium carbonate, triethylamine, and pyridine; The thickness of the adhesive layer is 0.03%-0.07% of the thickness of the polymer base layer; The adhesive layer is a polyurethane adhesive layer.

8. The exchange core of the fresh air system as described in claim 7, characterized in that, The flocked layer is disposed on the polymer base layer via an adhesive layer, comprising: The surface of the polymer base layer is modified to obtain a modified surface, and then an adhesive layer and a flocking layer are formed on the modified surface. The modification treatment is either PP water treatment or corona treatment.

9. The exchange core of the fresh air system as described in claim 8, characterized in that, The treatment temperature for the PP water is 45℃-55℃, the mass concentration of the PP water is 5%-10%, and the treatment time is 40s-90s. The corona treatment was performed at a temperature of 20℃-35℃, a linear velocity of 15m / min-30m / min, and a corona value of 10W·min / m. 2 -50W·min / m 2 .

10. A fresh air system, characterized in that, Includes the switching core as described in any one of claims 1-9.

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