A condensation-free air duct structure and fresh air purification ventilator composed of the same

Abstract

The present invention discloses a condensation-free air duct structure and a fresh air purification ventilator composed of the same. The condensation-free air duct structure is an integrally formed structure made of polypropylene plastic foam material, and has a preset wall thickness that can achieve no condensation. The condensation-free air duct structure includes an outdoor fresh air duct structure and an indoor return air duct structure; the fresh air duct structure is used to transport outdoor fresh air, and the indoor return air duct structure is used to transport indoor return air. The condensation-free air duct structure is used on the fresh air purification ventilator, and each device of the fresh air purification ventilator is plugged into the preset position of the condensation-free air duct structure, so that the installation of each device is simpler and more convenient, and the problem of poor sealing after the installation of each device is solved. At the same time, the use of the condensation-free air duct structure can also prevent the condensation phenomenon of the fresh air purification ventilator, thereby improving the performance of the fresh air purification ventilator.

Description

Technical Field

[0001] The invention relates to a condensation-free air duct structure and also to a fresh air purification ventilator comprising the condensation-free air duct structure, belonging to the technical field of fresh air ventilation equipment. Background Art

[0002] Condensation is the phenomenon that high-temperature, high-humidity gas liquefies into liquid on the surface of a low-temperature object when it reaches the dew point temperature. Existing fresh air purification ventilators will have condensation during use, especially at the intersection of the fresh air inlet to the front section of the heat exchanger and the return air outlet after the heat exchanger, and at locations where there may be a temperature difference with the environment.

[0003] There are two main hazards of condensation in fresh air purification ventilators: 1. Condensed water may be blown out from the air outlet and blown into the room, increasing the air humidity, causing discomfort to the human body, and also making the clothes in the room damp and the home moldy; 2. Water accumulates inside the air duct, breeding mold and bacteria. These bacteria, mold and viruses spread throughout the home space with the fresh air, and if inhaled by the human body, it will endanger the health of the family.

[0004] In order to solve the condensation problem of the existing fresh air purification ventilator, a condensate pan and a condensate pipe connected thereto are usually used to discharge the condensation generated inside the fresh air purification ventilator to the outside. However, there are the following disadvantages: 1. The condensate pan is small, so that the condensate pan under the unit cannot completely contain the unit, and the water condensed by the surface cooler will drip outside the pan. In addition, if there is no condensate pan under the manual and electric valves on the fan coil and the cold water pipe connection, condensation is more likely to occur at the valve handle and valve connection. 2. The connection between the condensate pan and the surface cooler is not insulated. Due to the low surface temperature of the surface cooler, if the connection between the condensate pan and the surface cooler is not treated accordingly, a cold bridge will be formed, which is more likely to cause condensation dripping accidents. 3. The slope of the condensate pipe is unreasonable, and the condensate cannot be discharged in time and smoothly, causing the condensate to accumulate more and more in the condensate pan and finally overflow. Summary of the invention

[0005] The primary technical problem to be solved by the present invention is to provide a condensation-free air duct structure.

[0006] Another technical problem to be solved by the present invention is to provide a fresh air purification ventilator including the above-mentioned condensation-free air duct structure.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] According to a first aspect of an embodiment of the present invention, there is provided a condensation-free air duct structure, wherein:

[0009] The non-condensation air duct structure is an integrally formed structure made of polypropylene plastic foam material, and the non-condensation air duct structure has a preset wall thickness that can achieve no condensation;

[0010] The condensation-free air duct structure includes an outdoor fresh air duct structure and an indoor return air duct structure; the fresh air duct structure is used to transport outdoor fresh air, and the indoor return air duct structure is used to transport indoor return air.

[0011] Preferably, the preset wall thickness is calculated based on the cross-sectional area of ​​the preset non-condensation air duct structure and the numerical value of the air volume flowing through the non-condensation air duct structure.

[0012] Preferably, the cross-sectional area of ​​the non-condensation air duct structure includes the cross-sectional area of ​​the outdoor fresh air duct structure and the cross-sectional area of ​​the indoor return air duct structure; the air volume flowing through the non-condensation air duct structure includes the air volume flowing through the outdoor fresh air duct structure and the air volume flowing through the indoor return air duct structure.

[0013] Preferably, the wind speed flowing through the outdoor fresh air duct structure and the wind speed flowing through the indoor return air duct structure are calculated according to the cross-sectional area of ​​the outdoor fresh air duct structure and the air volume flowing through the outdoor fresh air duct structure, and the cross-sectional area of ​​the indoor return air duct structure and the air volume flowing through the indoor return air duct structure; the wind speed flowing through the outdoor fresh air duct structure and the wind speed flowing through the indoor return air duct structure are both expressed as:

[0014]

[0015] Wherein, when v represents the wind speed flowing through the outdoor fresh air duct structure, Q represents the air volume flowing through the outdoor fresh air duct structure, and S represents the cross-sectional area of ​​the outdoor fresh air duct structure;

[0016] When v represents the wind speed flowing through the indoor return air duct structure, Q represents the air volume flowing through the indoor return air duct structure, and S represents the cross-sectional area of ​​the indoor return air duct structure.

[0017] Preferably, the minimum wall thickness of the outdoor fresh air duct structure to achieve no condensation and the minimum wall thickness of the indoor return air duct structure to achieve no condensation are expressed as:

[0018] L=0.6v 2 -7v+33

[0019] Wherein, v represents the wind speed flowing through the outdoor fresh air duct structure corresponding to the minimum wall thickness of the outdoor fresh air duct structure to achieve no condensation; or v represents the wind speed flowing through the indoor return air duct structure corresponding to the minimum wall thickness of the indoor return air duct structure to achieve no condensation;

[0020] Among the values ​​of the minimum wall thickness for achieving condensation-free outdoor fresh air duct structure and the minimum wall thickness for achieving condensation-free indoor return air duct structure, the largest value of the minimum wall thickness is selected as the preset wall thickness of the condensation-free duct structure.

[0021] According to a second aspect of an embodiment of the present invention, a fresh air purification ventilator is provided, comprising a box body made of polypropylene plastic foam material, the condensation-free air duct structure is arranged inside the box body, the condensation-free air duct structure is arranged inside a primary filter, a return air primary filter, a heat exchanger, a high-efficiency filter, an exhaust fan, a return air fan, and a main control device, and the exhaust fan and the return air fan are respectively connected to the main control device.

[0022] Preferably, the non-condensation air duct structure is internally provided with a first volute structure and a second volute structure made of polypropylene plastic foam material, which are used to install the exhaust fan and the return air fan respectively.

[0023] Preferably, a PM2.5 filter, a PM2.5 sensor, and a temperature sensor are further provided inside the non-condensation air duct structure, and the PM2.5 sensor and the temperature sensor are respectively connected to the main control device;

[0024] The box body is provided with a fresh air inlet, a return air outlet, a return air inlet, and a fresh air outlet; the fresh air inlet and the fresh air outlet are correspondingly connected to the outdoor fresh air duct structure, so that the outdoor fresh air enters the outdoor fresh air duct structure from the fresh air inlet, passes through the primary filter, the PM2.5 filter, and then passes through the heat exchanger and the high-efficiency filter in sequence, and is discharged from the fresh air outlet to the room;

[0025] The return air outlet and the return air inlet are correspondingly connected to the indoor return air duct structure, so that the indoor return air enters the indoor return air duct structure from the return air inlet, passes through the return air primary filter and the heat exchanger in sequence, and is discharged to the outside from the return air outlet.

[0026] Preferably, the primary filter, the PM2.5 filter, the return air primary filter, the high efficiency filter and the main control device are respectively installed at preset positions of the non-condensing air duct structure through a plurality of slideways;

[0027] The heat exchanger is installed at a preset position of the non-condensation air duct structure through a plurality of slide grooves;

[0028] The plurality of slideways and the slide grooves are respectively connected to the non-condensation air duct structure as one body, and the wall thickness and material of the plurality of slideways and the slide grooves are the same as those of the non-condensation air duct structure.

[0029] Preferably, the heat exchanger is a cross-flow plate-fin type total heat exchanger, which includes an air supply channel and an air exhaust channel, wherein the air supply channel is connected to the indoor return air duct structure, and the exhaust channel is connected to the outdoor fresh air duct structure.

[0030] The condensation-free air duct structure provided by the present invention and the fresh air purification ventilator composed of the same, on the one hand, adopts polypropylene plastic foam material to make the condensation-free air duct structure with a preset wall thickness, and utilizes the wall thickness of the condensation-free air duct structure to achieve condensation-free. On the other hand, the condensation-free air duct structure is used on the fresh air purification ventilator, and each device of the fresh air purification ventilator is plugged into the preset position of the condensation-free air duct structure, so that the installation of each device is simpler and more convenient, and the problem of poor sealing after the installation of each device is solved. At the same time, the use of the condensation-free air duct structure can also prevent the condensation phenomenon of the fresh air purification ventilator, thereby improving the performance of the fresh air purification ventilator. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A schematic diagram of a condensation-free air duct structure provided by the present invention;

[0032] Figure 2 A schematic diagram of the non-condensation air duct structure provided by the present invention being installed in an enthalpy difference laboratory;

[0033] Figure 3 A curve diagram of the minimum wall thickness of the B plate when no condensation occurs at each air volume in the non-condensation air duct structure provided by the present invention and the corresponding wind speed of the fresh air flowing through the outdoor fresh air duct structure;

[0034] Figure 4 This is a schematic diagram of the structure of the fresh air purification ventilator provided by the present invention;

[0035] Figure 5 This is a schematic diagram of the condensation-free air duct structure in the fresh air purification ventilator provided by the present invention. DETAILED DESCRIPTION

[0036] The technical content of the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0037] The non-condensation air duct structure provided by the present invention improves the air duct structure of the existing fresh air purification ventilator according to the characteristics of EPP (Expanded polypropylene-EPP, polypropylene plastic foam material), and effectively prevents condensation from occurring in the air duct structure. The non-condensation air duct structure is applied to the fresh air purification ventilator to avoid condensation from occurring in the fresh air purification ventilator.

[0038] Among them, EPP material is a highly crystalline polymer / gas composite material with excellent performance, closed-cell independent bubble structure, low thermal conductivity, and is best used as a thermal insulation material and buoyancy material. At the same time, EPP material has very good toughness and appropriate hardness, and has excellent buffering performance within a large load range. Therefore, the condensation-free air duct structure made of EPP material not only has good insulation performance and can prevent condensation from occurring, but also has the characteristics of light weight, low cost, good thermal insulation effect, and strong and reliable.

[0039] The fresh air purification ventilator with the non-condensation air duct structure does not need to be equipped with additional condensation water trays and condensation water pipes and other accessories connected thereto, and does not need to be insulated for the fresh air purification ventilator, making the structure of the fresh air purification ventilator simpler and the cost lower. At the same time, the use of the non-condensation air duct structure also solves the problem that the existing fresh air purification ventilator has an unsatisfactory anti-condensation effect.

[0040] The condensation-free air duct structure provided by the present invention is an integrated structure made of EPP material, and the condensation-free air duct structure includes an outdoor fresh air duct structure and an indoor return air duct structure. Among them, the fresh air duct structure is used to transport outdoor fresh air, and the indoor return air duct structure is used to transport indoor return air. The outdoor fresh air duct structure and the indoor return air duct structure have a preset wall thickness, and the wall thickness of the outdoor fresh air duct structure and the indoor return air duct structure is used to achieve condensation-free. According to the preset cross-sectional area of ​​the condensation-free air duct structure and the numerical value of the air volume flowing through the condensation-free air duct structure, the minimum wall thickness value of the outdoor fresh air duct structure and the indoor return air duct structure to achieve condensation-free can be obtained. It can be seen that the wall thickness of the condensation-free air duct structure is the key to avoiding condensation.

[0041] Combine the following Figure 1 to Figure 3 Tables 1 and 2 provide a detailed description of how to obtain the minimum wall thickness of the non-condensing air duct structure to achieve no condensation.

[0042] In one embodiment of the invention, Figure 1 As shown, EPP material is used to make condensation-free air duct structures with wall thicknesses of 5mm, 10mm, 15mm, 20mm, 25mm and 30mm, and the sealing performance of the condensation-free air duct structure is tested (whether there is air leakage on the outer wall of the condensation-free air duct structure); the condensation-free air duct structure includes an outdoor fresh air duct structure 1 and an indoor return air duct structure 2, and the outdoor fresh air duct structures 1 with different wall thicknesses have the same cross-sectional area, and the indoor return air duct structures 2 with different wall thicknesses also have the same cross-sectional area.

[0043] Since the non-condensing air duct structure is mainly used to achieve the non-condensing effect under heating condition (I), heating condition (II) and cooling condition. In addition, the cooling condition is similar to the heating condition (I). The heating condition (II) is the condensation condition when the machine is shut down, so the condensation is far less serious than the heating condition (I). Therefore, taking the heating condition (I) as an example, the non-condensing air duct structure with different wall thicknesses is tested, and the minimum wall thickness of the non-condensing air duct structure without condensation is obtained by analysis.

[0044] like Figure 2 As shown in the figure, the non-condensing air duct structures with wall thicknesses of 5mm, 10mm, 15mm, 20mm, 25mm and 30mm were installed in the enthalpy difference laboratory, and the test was carried out according to the national standard GB / T21087-2007 "Air-to-Air Energy Recovery Device". Under the heating condition (I), the condensation water dripping of the A plate (wall panel), the B plate (wall panel) and the C plate (wall panel) were recorded respectively, as shown in Table 1. Among them, " / " means that the wall thickness of a certain wall panel cannot meet the test requirements under this air volume, so the test of this wall panel under this air volume is abandoned. Since the test uses visual inspection to judge whether there is condensation water dripping on the indoor side of the tested wall panel, as shown in Table 1, the condensation water dripping of the A plate (wall panel), the B plate (wall panel) and the C plate (wall panel) include the following situations: Ⅰ means no water mist and no dripping, Ⅱ means condensation water and no dripping, Ⅲ means condensation water and dripping.

[0045]

[0046] Table 1 Condensation water dripping on plate A, plate B and plate C under heating condition (I)

[0047] It can be seen from Table 1 that the A plates with wall thickness of 5mm, 10mm, 15mm, 20mm, 25mm and 30mm are respectively 3 / h、300m 3 / h、500m 3 / h、700m 3 / h and 1000m 3 / h, there was no temperature change and no condensation.

[0048] For plates B and C with the same wall thickness, the condensation phenomenon decreases with the increase of air volume; and for plates B and C with the same air volume, the condensation phenomenon decreases with the increase of wall thickness.

[0049] Since in actual production, the non-condensing air duct structure is made of EPP material, the wall thickness of all wall panels of the non-condensing air duct structure must be consistent. Therefore, the board with the most obvious condensation phenomenon among the A board, B board and C board can be selected for analysis to obtain the minimum wall thickness for the non-condensing air duct structure to achieve non-condensation. In the case of condensation water dripping on the A board, B board and C board, the condensation phenomenon of the B board is the most obvious, so the B board is analyzed in combination with Table 1 below.

[0050] Since Table 1 is for the test of the cross-sectional area of ​​the outdoor fresh air duct structure 1 and the indoor return air duct structure 2 of the non-condensation air duct structure using 200mmx300mm, the condensation water dripping of the A plate (wall panel), B plate (wall panel) and C plate (wall panel) is obtained, and the outdoor fresh air duct structure 1 and the indoor return air duct structure 2 share the B plate, therefore, the outdoor fresh air duct structure 1 or the indoor return air duct structure 2 can be taken as an example to analyze the B plate. The following takes the outdoor fresh air duct structure 1 as an example to analyze the B plate. Among them, the wind speed of the fresh air flowing through the outdoor fresh air duct structure can be expressed as:

[0051]

[0052] Among them, Q represents the air volume flowing through the outdoor fresh air duct structure, and S represents the cross-sectional area of ​​the outdoor fresh air duct structure.

[0053] In Table 1, the minimum wall thickness of plate B when no condensation occurs at each air volume is selected, and the wind speed of the fresh air flowing through the outdoor fresh air duct structure corresponding to each minimum wall thickness is calculated respectively.

[0054] Specifically, it can be seen from Table 1 that when the wind volume is 150m 3 / h, the minimum wall thickness without condensation is 30mm; when the air volume is 300m 3 / h, the minimum wall thickness without condensation is 25mm; when the air volume is 500m 3 / h, the minimum wall thickness without condensation is 20mm; when the air volume is 700m 3 / h, the minimum wall thickness without condensation is 20mm; when the air volume is 1000m 3 / h, the minimum wall thickness when no condensation occurs is 15mm; the air volume flowing through the outdoor fresh air duct structure corresponding to each minimum wall thickness and the cross-sectional area of ​​the outdoor fresh air duct structure are respectively substituted into formula (1). Since in the present invention, the air volume is m 3 / h, so the air volume needs to be converted into wind speed. The wind speed of the fresh air flowing through the outdoor fresh air duct structure corresponding to each minimum wall thickness can be obtained from formula (1), as shown in Table 2.

[0055] Wind speed m / s 4.63 3.24 2.31 1.39 0.69 Wall thickness mm 15 20 20 25 30

[0056] Table 2 Wall thickness-wind speed comparison table

[0057] like Figure 3 The curve diagram of each minimum wall thickness and the corresponding wind speed of the fresh air flowing through the outdoor fresh air duct structure shows the formula:

[0058] L=0.6v 2 -7v+33 (2)

[0059] Wherein, L represents the minimum wall thickness of the non-condensing air duct structure to achieve non-condensing (unit: mm), and v represents the wind speed flowing through the non-condensing air duct structure (unit: m / s).

[0060] In order to facilitate practical application, in fact, the calculated minimum wall thickness of the condensation-free air duct structure to achieve condensation-free is generally rounded.

[0061] In summary, by substituting the cross-sectional area of ​​the preset non-condensing air duct structure and the air volume value flowing through the non-condensing air duct structure into formula (1), the wind speed flowing through the non-condensing air duct structure is obtained, and the obtained wind speed flowing through the non-condensing air duct structure is substituting it into formula (2) to obtain the minimum wall thickness of the non-condensing air duct structure to achieve non-condensing.

[0062] For example, suppose the air volume of the cabinet-type fresh air purification ventilator designed to flow through the non-condensing air duct structure is 300m 3 / h, and the design size of the outdoor fresh air duct structure is about 200mmx330mm, and the design size of the indoor return air duct structure is about 60mmx330mm; by respectively substituting into formula (1) and formula (2), it can be obtained that the minimum wall thickness of the outdoor fresh air duct structure to achieve no condensation is 25mm, and the minimum wall thickness of the indoor return air duct structure to achieve no condensation is 20mm. In actual production, the wall thickness of all wall panels of the present condensation-free duct structure must be consistent. Therefore, the wall thickness with a larger value is selected from the minimum wall thickness of the outdoor fresh air duct structure and the indoor return air duct structure to achieve no condensation as the minimum wall thickness of the present condensation-free duct structure.

[0063] Since the existing fresh air purification ventilators include wall-mounted, cabinet-type, ceiling-mounted, etc., the following is combined with Figure 4-5 Taking a cabinet-type fresh air purifier as an example, the structure and principle of the fresh air purification ventilator including the non-condensation air duct structure are explained in detail.

[0064] like Figure 4 and Figure 5As shown, the present invention also provides a fresh air purification ventilator including the above-mentioned condensation-free structure. The fresh air purification ventilator includes a box body 3 made of EPP material. In order to ensure the beauty of the fresh air purification ventilator, a sheet metal part can be covered on the outside of the box body 3, and the sheet metal part can also be used to achieve the function of connection and fixing. The box body 3 is provided with a condensation-free air duct structure 4 provided by the present invention made of EPP material, and the condensation-free air duct structure 4 is provided with a first volute structure 141 and a second volute structure 151 made of EPP material and used to install the exhaust fan 14 and the return air fan 15 respectively; by arranging the first volute structure 141 and the second volute structure 151 in the condensation-free air duct structure 4, the condensation phenomenon caused by the intersection of cold and hot can be avoided.

[0065] like Figure 4 As shown, a primary filter 5, a PM2.5 filter 6, a return air primary filter 16, a heat exchanger 7, a high-efficiency filter 8 and a main control device 9 are installed in sequence from bottom to top inside the non-condensation air duct structure 4, wherein the primary filter 5, the PM2.5 filter 6, the return air primary filter 16, the heat exchanger 7, the high-efficiency filter 8 are installed in the outdoor fresh air duct structure 401 of the non-condensation air duct structure 4, the main control device 9 is installed in the indoor return air duct structure 402 of the non-condensation air duct structure 4, and the heat exchanger 7 is respectively connected to the outdoor fresh air duct structure 401 and the indoor return air duct structure 402.

[0066] like Figure 4 and Figure 5 As shown, a fresh air inlet 10, a return air outlet 11, a return air inlet, and a fresh air outlet 12 are provided on the box body 3. The fresh air inlet 10 and the fresh air outlet 12 are correspondingly connected to the outdoor fresh air duct structure 401, so as to make the outdoor fresh air enter the outdoor fresh air duct structure 401 from the fresh air inlet 10, and be filtered by the primary filter 5 and the PM2.5 filter 6 in the outdoor fresh air duct structure 401 in sequence, enter the heat exchanger 7, and be filtered by the high-efficiency filter 8 before being discharged to the room from the fresh air outlet 12. The return air outlet 11 and the return air inlet are correspondingly connected to the indoor return air duct structure 402, so as to make the indoor return air enter the indoor return air duct structure 402 from the return air inlet, and be discharged to the outside from the return air outlet 11 after passing through the return air primary filter 16 and the heat exchanger 7 in sequence.

[0067] like Figure 5As shown, in order to facilitate the installation of the primary filter 5, PM2.5 filter 6, return air primary filter 16, and high-efficiency filter 8, multiple strip slides can be set on the non-condensing air duct structure 4, and the multiple strip slides are connected to the non-condensing air duct structure 4, and the wall thickness and material are the same as the non-condensing air duct structure 4. The shapes and sizes of the multiple strip slides correspond to the side walls in contact with the primary filter 5, PM2.5 filter 6, return air primary filter 16, and high-efficiency filter 8, and through repeated experiments, it is found that the size of the strip slide is 1mm larger than the side wall size of the filter in contact with the strip slide. This not only facilitates the installation of each filter, but also avoids the problem of poor sealing. For details, please refer to Figure 4 and Figure 5 The first slideway 25 for installing the primary filter 5 is an integrally formed structure made of EPP material. When installing the primary filter 5, it is only necessary to align the side wall of the primary filter 5 with the first slideway 25, push the primary filter 5 to move along the first slideway 25, and move the primary filter 5 until the side wall of the primary filter 5 is completely in contact with the first slideway 25, thereby completing the assembly process of the primary filter 5. When the primary filter 5 needs to be repaired, it is only necessary to pull the primary filter 5 out along the first slideway 25. Similarly, the second slide 26 for installing the PM2.5 filter 6, the third slide 28 for installing the high-efficiency filter 8, and the fifth slide 24 for installing the return air primary filter 16 are also made of EPP material to form an integrated structure. When installing the PM2.5 filter 6, the return air primary filter 16, and the high-efficiency filter 8, it is only necessary to align the side walls of the PM2.5 filter 6, the return air primary filter 16, and the high-efficiency filter 8 with the second slide 26, the fifth slide 24, and the third slide 28, respectively, and then push the PM2.5 filter 6, the return air primary filter 16, and the high-efficiency filter 8. Filter 16 and high efficiency filter 8, so that PM2.5 filter 6, return air primary filter 16 and high efficiency filter 8 move along the second slide 26, the fifth slide 24 and the third slide 28 respectively, and move PM2.5 filter 6, return air primary filter 16 and high efficiency filter 8 until the side walls of PM2.5 filter 6, return air primary filter 16 and high efficiency filter 8 are all in contact with the second slide 26, the fifth slide 24 and the third slide 28, thereby completing the assembly process of PM2.5 filter 6, return air primary filter 16 and high efficiency filter 8. When PM2.5 filter 6, return air primary filter 16 and high efficiency filter 8 need to be repaired, just pull PM2.5 filter 6, return air primary filter 16 and high efficiency filter 8 out along the second slide 26, the fifth slide 24 and the third slide 28. A plurality of slideways are used to complete the assembly of the primary filter 5, the PM2.5 filter 6, the return air primary filter 16 and the high efficiency filter 8. This process does not require the use of any installation parts, making it easier to disassemble and assemble the primary filter 5, the PM2.5 filter 6, the return air primary filter 16 and the high efficiency filter 8.

[0068] like Figure 5 As shown, in order to facilitate the installation of the heat exchanger 7, a plurality of chutes 27 can be provided on the non-condensation air duct structure 4, and the plurality of chutes 27 are connected to the non-condensation air duct structure 4 as a whole, and the wall thickness and material are the same as those of the non-condensation air duct structure 4. The position, shape and size of the chutes 27 match the heat exchanger 7. Similarly, after repeated experiments, it is concluded that the size of the plurality of chutes 27 is 1 mm larger than the size of the corner of the heat exchanger 7 in contact with the chutes 27, which is the best. This is not only convenient for installing the heat exchanger 7, but also does not cause the problem of poor sealing. Align the heat exchanger 7 with the plurality of chutes 27, push the heat exchanger 7, and move the heat exchanger 7 until all the corners of the heat exchanger 7 are firmly attached to the plurality of chutes 27, thereby completing the assembly process of the heat exchanger 7. When the heat exchanger 7 needs to be repaired, the heat exchanger 7 only needs to be pulled out along the plurality of chutes 27. Therefore, the assembly process of the heat exchanger 7 is completed by using a plurality of chutes 27, without using any installation parts, and it is more convenient to disassemble and assemble the heat exchanger 7.

[0069] The heat exchanger 7 is preferably a cross-flow plate-fin type total heat exchanger made of heat exchange paper. The cross-flow plate-fin type total heat exchanger operates on the principle of cross-flow heat exchange of air with different temperature and humidity, and two adjacent heat exchange plates form an air supply or exhaust channel, and the air supply channel and the exhaust channel are perpendicular to each other. Among them, the air supply channel is connected to the indoor return air duct structure 402, and the exhaust channel is connected to the outdoor fresh air duct structure 401. The indoor return air passes through one side of the heat exchange plate and the outdoor fresh air passes through the other side of the heat exchange plate. Therefore, the temperature is transferred from the higher side to the lower side through the heat exchange plate, and the humidity is transferred from the larger side to the smaller side through the heat exchange plate, thereby achieving the temperature and humidity of the indoor return air and the outdoor fresh air. This process does not require high power consumption, which reduces the cost of household electricity. At the same time, the cross-flow plate-fin type total heat exchanger also has antibacterial and mildew-proof properties, for example, it has a bactericidal effect on Escherichia coli, Staphylococcus aureus, Hepatitis Bacillus, Candida albicans, etc.

[0070] like Figure 4 and Figure 5As shown, in order to facilitate the installation of the main control device 9, a fourth slide 29 can be set on the non-condensing air duct structure 4. The fourth slide 29 is connected to the non-condensing air duct structure 4, and the wall thickness and material are the same as those of the non-condensing air duct structure 4. The shape and size of the fourth slide 29 match one side of the main control device 9. Similarly, after repeated experiments, it is concluded that the size of the fourth slide 29 is 1mm larger than the size of the side wall of the main control device 9 in contact with the fourth slide 29. This is not only convenient for installing the main control device 9, but also does not cause the problem of poor sealing. Align the main control device with the fourth slide 29, push the main control device 9, so that the side walls of the main control device 9 are all firmly attached to the fourth slide 29, thereby completing the assembly process of the main control device 9. When the main control device 9 needs to be removed, it is only necessary to pull the main control device 9 out along the fourth slide 29. Therefore, the fourth slide 29 is used to complete the assembly process of the main control device 9, without the need to use any installation parts, and it is more convenient to disassemble and assemble the main control device 9.

[0071] A PM2.5 sensor 13 and a temperature sensor (not shown) are installed on the main control device 9 at a position directly opposite to the return air inlet, and the exhaust fan 14, the return air fan 15, the PM2.5 sensor 13 and the temperature sensor are respectively connected to the main control device 9. An inspection door is installed on the box body 3, and a display screen is installed on the inspection door, and the display screen is connected to the main control device 9.

[0072] The main control device 9 can be a PCB motherboard, which supplies power to the electrical equipment and display screen in the box 3, and cooperates with the display screen to complete the control process of each device in the box 3. The display screen can use a touch screen controller, which can be connected to a wireless network terminal, can implement local or remote control, and also has a switch function, a manual air volume adjustment function, a timed start or shutdown function, an automatic start or shutdown function, a clock display function, a PM2.5 content display function, a sleep function, a temperature and humidity value display function, and also has "purification", "strong cleaning" and "super cleaning" functions; multiple time periods can be selected every day to set and adjust the air volume, and can be switched automatically.

[0073] To sum up, in the process of assembling various devices of the fresh air purification ventilator, it is only necessary to plug each device into the preset position of the non-condensation air duct structure. When a device needs to be repaired or cleaned, the device can be directly removed from the preset position. Therefore, the fresh air purification ventilator using the non-condensation air duct structure provided by the present invention can not only prevent the occurrence of condensation, but also make the installation of various devices simpler and more convenient. At the same time, it also solves the problem of poor sealing after the installation of various devices, thereby improving the performance of the fresh air purification ventilator.

[0074] The working process of the fresh air purification ventilator provided by the present invention is as follows: outdoor fresh air enters the outdoor fresh air duct structure 401 through the fresh air inlet 10, and at the same time, the indoor return air enters the indoor return air duct structure 402 through the return air inlet. The outdoor fresh air entering the outdoor fresh air duct structure 401 is filtered by the primary filter 5 and the PM2.5 filter 6 in turn, and then enters the second channel of the heat exchanger 7; the indoor return air entering the indoor return air duct structure 402 enters the first channel of the heat exchanger 7, and the indoor return air and the outdoor fresh air are fully heat exchanged. The heated outdoor fresh air flows out from the heat exchanger 7, and after being filtered by the high-efficiency filter 8, it passes through the exhaust fan 14 and is discharged to the room from the fresh air outlet 12. The indoor return air is discharged from the heat exchanger 7, and then passes through the return air fan 15 and is discharged to the outside from the return air outlet 11. In this process, the filtering process of outdoor fresh air and the exhaust process of indoor return air both occur in the non-condensing air duct structure, and because the non-condensing air duct structure adopts the minimum non-condensing wall thickness, condensation is avoided at the intersection of the fresh air inlet to the front section of the heat exchanger and the air inlet and outlet section after the heat exchanger. At the same time, all the installation parts of the fresh air purification ventilator are also set in the non-condensing air duct structure, avoiding the temperature difference caused by the contact between the installation parts and the outside, effectively preventing the "cold bridge" phenomenon, and fundamentally eliminating the occurrence of condensation.

[0075] The condensation-free air duct structure provided by the present invention and the fresh air purification ventilator composed of the same, on the one hand, adopts EPP material to make the condensation-free air duct structure with a preset wall thickness, and utilizes the wall thickness of the condensation-free air duct structure to achieve condensation-free. On the other hand, the condensation-free air duct structure is used on the fresh air purification ventilator, and each device of the fresh air purification ventilator is plugged into the preset position of the condensation-free air duct structure, so that the installation of each device is simpler and more convenient, and the problem of poor sealing after the installation of each device is solved. At the same time, the use of the condensation-free air duct structure can also prevent the condensation phenomenon of the fresh air purification ventilator, thereby improving the performance of the fresh air purification ventilator.

[0076] The above is a detailed description of the non-condensation air duct structure and the fresh air purification ventilator composed of the present invention. For those skilled in the art, any obvious changes made to it without departing from the essential spirit of the present invention will fall within the scope of protection of the patent right of the present invention.

Claims

1. A condensation-free air duct structure, characterized in that: The non-condensation air duct structure is an integrally formed structure made of polypropylene plastic foam material, and the non-condensation air duct structure has a preset wall thickness that can achieve no condensation; The non-condensation air duct structure includes an outdoor fresh air duct structure and an indoor return air duct structure; the fresh air duct structure is used to transport outdoor fresh air, and the indoor return air duct structure is used to transport indoor return air; The cross-sectional area of ​​the non-condensation air duct structure includes the cross-sectional area of ​​the outdoor fresh air duct structure and the cross-sectional area of ​​the indoor return air duct structure; The air volume flowing through the non-condensation air duct structure includes the air volume flowing through the outdoor fresh air duct structure and the air volume flowing through the indoor return air duct structure; The wind speed flowing through the outdoor fresh air duct structure and the wind speed flowing through the indoor return air duct structure are calculated according to the cross-sectional area of ​​the outdoor fresh air duct structure and the air volume flowing through the outdoor fresh air duct structure, and the cross-sectional area of ​​the indoor return air duct structure and the air volume flowing through the indoor return air duct structure; the wind speed flowing through the outdoor fresh air duct structure and the wind speed flowing through the indoor return air duct structure are both expressed as: ， Wherein, when v represents the wind speed flowing through the outdoor fresh air duct structure, Q represents the air volume flowing through the outdoor fresh air duct structure, and S represents the cross-sectional area of ​​the outdoor fresh air duct structure; When v represents the wind speed flowing through the indoor return air duct structure, Q represents the air volume flowing through the indoor return air duct structure, and S represents the cross-sectional area of ​​the indoor return air duct structure; The minimum wall thickness of the outdoor fresh air duct structure to achieve no condensation and the minimum wall thickness of the indoor return air duct structure to achieve no condensation are both expressed as: , Wherein, v represents the wind speed flowing through the outdoor fresh air duct structure corresponding to the minimum wall thickness of the outdoor fresh air duct structure to achieve no condensation; or v represents the wind speed flowing through the indoor return air duct structure corresponding to the minimum wall thickness of the indoor return air duct structure to achieve no condensation; Among the values ​​of the minimum wall thickness for achieving condensation-free outdoor fresh air duct structure and the minimum wall thickness for achieving condensation-free indoor return air duct structure, the largest value of the minimum wall thickness is selected as the preset wall thickness of the condensation-free duct structure.

2. The condensation-free air duct structure according to claim 1, characterized in that: The preset wall thickness is calculated based on the cross-sectional area of ​​the preset non-condensation air duct structure and the air volume value flowing through the non-condensation air duct structure.

3. A fresh air purification ventilator, characterized in that It comprises a box body made of polypropylene plastic foam material, wherein the non-condensation air duct structure as described in any one of claims 1 to 2 is arranged inside the box body, wherein the non-condensation air duct structure is provided with a primary filter, a return air primary filter, a heat exchanger, a high-efficiency filter, an exhaust fan, a return air fan, and a main control device, and the exhaust fan and the return air fan are respectively connected to the main control device.

4. The fresh air purification ventilator according to claim 3, characterized in that: The non-condensation air duct structure is internally provided with a first volute structure and a second volute structure made of polypropylene plastic foam material and used for installing the exhaust fan and the return air fan respectively.

5. The fresh air purification ventilator according to claim 4, characterized in that: A PM2.5 filter, a PM2.5 sensor, and a temperature sensor are also provided inside the non-condensation air duct structure, and the PM2.5 sensor and the temperature sensor are respectively connected to the main control device; The box body is provided with a fresh air inlet, a return air outlet, a return air inlet, and a fresh air outlet; The fresh air inlet and the fresh air outlet are correspondingly connected to the outdoor fresh air duct structure, so that the outdoor fresh air enters the outdoor fresh air duct structure from the fresh air inlet, passes through the primary filter and the PM2.5 filter, and then passes through the heat exchanger and the high-efficiency filter in sequence, and is discharged to the room from the fresh air outlet; The return air outlet and the return air inlet are correspondingly connected to the indoor return air duct structure, so that the indoor return air enters the indoor return air duct structure from the return air inlet, passes through the return air primary filter and the heat exchanger in sequence, and is discharged to the outside from the return air outlet.

6. The fresh air purification ventilator according to claim 5, characterized in that: The primary filter, the PM2.5 filter, the return air primary filter, the high efficiency filter and the main control device are respectively installed at preset positions of the non-condensation air duct structure through a plurality of slideways; The heat exchanger is installed at a preset position of the non-condensation air duct structure through a plurality of slide grooves; The plurality of slideways and the slide grooves are respectively connected to the non-condensation air duct structure as one body, and the wall thickness and material of the plurality of slideways and the slide grooves are the same as those of the non-condensation air duct structure.

7. The fresh air purification ventilator according to claim 6, characterized in that: The heat exchanger is a cross-flow plate-fin type total heat exchanger, which includes an air supply channel and an air exhaust channel. The air supply channel is connected to the indoor return air duct structure, and the exhaust channel is connected to the outdoor fresh air duct structure.

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