Air supply unit for aircraft paint spray hangar with dehumidification function

Abstract

The utility model discloses an airplane paint spraying machine hangar air supply unit with dehumidification function, which comprises a fresh air section, a return air section, a primary and medium efficiency filter section for filtering air flowing through, a surface cooling water blocking section for cooling air flowing through and intercepting water drops generated by condensation, an air heating section for heating air flowing through, an air outlet section and an air supply fan connected in sequence, the fresh air section is used for the entry of external air, an electric fresh air damper is arranged at an air outlet of the fresh air section, an air inlet of the return air section is used for being connected with an air outlet of the airplane paint spraying machine hangar, an electric return air damper is arranged between the air inlet of the return air section and the air outlet of the airplane paint spraying machine hangar, and an air outlet of the air supply fan is connected with an air inlet of the airplane paint spraying machine hangar. The utility model can be used on the original air supply channel of the airplane paint spraying machine hangar, and the investment cost is low.

Description

Technical Field

[0001] This utility model belongs to the field of aircraft paint hangar dehumidification technology, specifically relating to an air supply unit for aircraft paint hangars with dehumidification function. Background Technology

[0002] Aircraft paint hangars are enclosed spaces specifically designed for painting aircraft. However, excessive humidity in these hangars can negatively impact the painting process in several ways: 1. High humidity can cause defects such as sagging and orange peel on the coating surface, affecting coating quality; 2. High humidity can prolong solvent evaporation time, reduce paint adhesion, and cause blistering, affecting the product's appearance and lifespan; 3. High humidity can also increase the risk of leakage or discharge in the high-voltage system of the paint sprayer, leading to equipment malfunction.

[0003] In the Pearl River Delta region, the problem of excessive humidity in aircraft painting hangars is even more severe, such as in Guangzhou. The following is an analysis report of high humidity meteorological data in Guangzhou over the past three years:

[0004] 1. Statistics on the number of days with high humidity

[0005] years RH≥85% days Longest consecutive days Main months of occurrence 2021 147 11 (March) February-April, September 2022 159 15 (March) March to May 2023 142 9 (April) February-April, November

[0006] Conclusion: High humidity days account for 68% of the total days in spring (February-April), which highly overlaps with the "return of spring" phenomenon.

[0007] 2. Duration of humidity above 85% RH

[0008] Duration of a single day Number of days in a year Main period Typical Japanese Case 8-12 hours 63 days 00:00-08:00 March 15, 2022 (lasted 9 hours) 12-18 hours 112 days Intermittent throughout the day April 2, 2021 (lasting 14 hours) >18 hours 32 days Day and night continuous February 28, 2023 (lasting 21 hours)

[0009] 3. Temperature and humidity correlation analysis, typical parameters for humid weather conditions:

[0010] Temperature range (°C) Average RH (%) Specific moisture content (g / kg) Dew point temperature (°C) 20-22 95±3 15.8 19.2 23-25 92±2 18.4 21.6 26-28 88±4 21.3 23.9

[0011] The data above shows that in the Pearl River Delta region, more attention needs to be paid to the dehumidification of aircraft paint hangars, and large-scale dehumidification equipment is required.

[0012] For aircraft paint spraying hangars, the specific humidity needs to be reduced to below 12 g / kg (corresponding to 65% RH / 28℃). The existing method involves purchasing a separate dehumidification unit and connecting it to the hangar for air circulation and dehumidification, meaning the hangar's fresh air supply duct is separate from the dehumidification equipment. However, due to the large size of aircraft paint spraying hangars and the large air volume required for the dehumidification equipment, purchasing a separate dehumidification unit is costly, occupies a large area, and consumes a lot of energy. Therefore, the inventor provides a dehumidification-functional air supply unit that can be used in the existing air supply duct of an aircraft paint spraying hangar. Utility Model Content

[0013] The purpose of this invention is to provide an air supply unit for aircraft paint spraying hangars with dehumidification function, which has low investment cost.

[0014] The objective of this utility model is achieved through the following technical solution:

[0015] A dehumidification air supply unit for an aircraft paint spraying hangar is characterized by comprising, in sequence, a fresh air section, a return air section, a primary and secondary filter section for filtering the flowing air, a surface cooling and water-blocking section for cooling the flowing air and intercepting condensed water droplets, an air heating section for heating the flowing air, an air outlet section, and a blower. The fresh air section is used for the intake of outside air, and an electric fresh air valve is provided at the air outlet of the fresh air section. The air inlet of the return air section is used to connect with the air outlet of the aircraft paint spraying hangar, and an electric return air valve is provided between the air inlet of the return air section and the air outlet of the aircraft paint spraying hangar. The air outlet of the blower is connected to the air inlet of the aircraft paint spraying hangar.

[0016] A further technical solution of this utility model is: the primary and secondary filtration sections include a primary filter of grade G4 and a secondary filter of grade F5 or F7.

[0017] A further technical solution of this utility model is: the surface cooler water baffle section includes a surface cooler and a water baffle plate disposed behind the surface cooler.

[0018] A further technical solution of this utility model is: the air heating section includes a duct heater.

[0019] A further technical solution of this utility model is: a check valve is provided at the air inlet of the blower.

[0020] A further technical solution of this utility model is: the air inlet of the fresh air section is equipped with rainproof louvers and insect-proof netting.

[0021] A further technical solution of this utility model is as follows: it includes two air supply channels arranged side by side, and each of the two air supply channels is provided with a fresh air section, a return air section, a primary and secondary efficiency filter section, a surface cooling water baffle section, an air heating section, an air outlet section and a blower.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] According to the present invention, the air supply unit for aircraft paint spraying hangars is modified by altering the original air supply duct of the aircraft paint spraying hangar. The unit consists of a fresh air section, a return air section, a primary and secondary filter section, a surface cooling water baffle section, an air heating section, an air outlet section, and a blower, which are connected in sequence according to the structure. This enables the original air supply duct of the aircraft paint spraying hangar to have a corresponding dehumidification function. There is no need to purchase separate dehumidification equipment for the aircraft paint spraying hangar, resulting in low investment costs and lower energy consumption. Attached Figure Description

[0024] Figure 1 This is a plan sectional view of the air supply unit for the aircraft painting hangar according to an embodiment of the present utility model;

[0025] Figure 2 This is a schematic elevation sectional view of the air supply unit for the aircraft painting hangar according to an embodiment of the present invention.

[0026] Meaning of the labels in the attached diagram:

[0027] 100-Fresh air section; 101-Insect screen; 102-Electric fresh air valve; 103-Rainproof louver; 200-Return air section; 300-Primary and secondary filter sections; 301-Primary filter; 302-Secondary filter; 400-Surface cooler water baffle section; 401-Surface cooler; 402-Water baffle; 403-Spacing plate; 404-Wave-shaped channel; 500-Air heating section; 501-Indirect heat exchange combustion unit; 600-Air outlet section; 700-Blower; 701-Check valve. Detailed Implementation

[0028] The present invention will be further described below with reference to embodiments.

[0029] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0030] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0031] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0032] Example:

[0033] like Figure 1 and Figure 2The image shown is an air supply unit for an aircraft paint spraying hangar with dehumidification function in this embodiment. It includes a fresh air section 100, a return air section 200, a primary and secondary filter section 300, a surface cooling water baffle section 400, an air heating section 500, an air outlet section 600, and a blower 700 connected in sequence.

[0034] The fresh air section 100 is an air inlet duct used for the entry of outside air. A rainproof louver 103 and an insect screen 101 are installed at the air inlet of the fresh air section 100. An electric fresh air valve 102 is installed at the air outlet of the fresh air section 100, which controls the entry of fresh outside air.

[0035] The air outlet of the fresh air section 100 is connected to the return air section 200. The return air section is a return air duct. The air inlet of the return air section 200 is connected to the air outlet of the aircraft paint spraying hangar. The air inside the aircraft paint spraying hangar can be circulated through the return air section 200 and dehumidified by the aircraft paint spraying hangar air supply unit. An electrically operated return air valve is installed between the air inlet of the return air section 200 and the air outlet of the aircraft paint spraying hangar. The air circulation inside the aircraft paint spraying hangar can be controlled by the electrically operated return air valve.

[0036] The air outlet of the return air section 200 is connected to the air inlet of the primary and secondary filter section 300. The primary and secondary filter section 300 includes a primary filter 301 of grade G4 and a secondary filter 302 of grade F5 or F7 located at its air inlet. The airflow passing through the primary and secondary filter section 300 will first be filtered by the primary filter 301 and then by the secondary filter 302.

[0037] The air outlet of the primary and secondary filter section 300 is connected to the air inlet of the surface cooling water baffle section 400. The surface cooling water baffle section 400 includes a surface cooler 401 and a baffle plate 402 located behind the surface cooler 401. The surface cooler 401 is located at the air inlet of the surface cooling water baffle section 400, and the baffle plate 402 is located inside the air outlet of the surface cooling water baffle section 400. Figure 1 As shown, the baffle plate 402 includes multiple corrugated partition plates 403 arranged side by side, forming a corrugated channel 404 between the partition plates 403. When the airflow enters the surface cooling baffle section 400, it will first be cooled by the surface cooler 401. During the cooling process, some of the moisture in the airflow will condense into water droplets, some of which will remain in the surface cooler 401 and then be discharged. Afterward, when the cooled airflow passes through the baffle plate 402, most of the water droplets carried in the airflow will be blocked by the baffle plate 402. Of course, the surface cooling baffle section 400 will also be equipped with a conventional drainage structure to drain the generated condensate.

[0038] The air outlet of the surface cooling water baffle section 400 is connected to the air inlet of the air heating section 500. The air heating section 500 is equipped with a duct heater, which heats the airflow. In this embodiment, the duct heater uses an existing 180kW indirect heat exchange combustion unit 501, which heats the airflow through the heat generated by combustion.

[0039] The air outlet of the air heating section 500 is connected to the air inlet of the air outlet section 600. The air outlet section 600 is an air outlet duct. The air outlet of the air outlet section 600 is connected to the air inlet of the blower 700. A check valve 701 is provided at the air inlet of the blower 700. The check valve 701 ensures that the airflow can only enter the blower 700 from the air outlet section 600 and will not flow backward. The air outlet of the blower 700 is connected to the air inlet of the aircraft painting hangar.

[0040] like Figure 1 As shown, the aircraft painting hangar air supply unit of this embodiment includes two air supply channels arranged side by side. Each of the two air supply channels is equipped with a fresh air section 100, a return air section 200, a primary and secondary filter section 300, a surface cooler water baffle section 400, an air heating section 500, an air outlet section 600, and a blower 700.

[0041] The application method of this embodiment is as follows:

[0042] According to this embodiment, the air supply unit for the aircraft paint spraying hangar is modified by connecting the following components in sequence: fresh air section 100, return air section 200, primary and secondary filter section 300, surface cooler water baffle section 400, air heating section 500, air outlet section 600, and blower 700. This allows the original air supply duct of the aircraft paint spraying hangar to have a corresponding dehumidification function. The specific operation process of this embodiment is as follows:

[0043] S1: During operation, the air supply unit of the aircraft paint hangar will first check the ambient temperature and humidity (typical humid weather conditions in Guangzhou: 25℃ / 95%RH), and set the target air supply parameters, such as setting the humidity ≤75%RH and the temperature ≥25℃.

[0044] S2: When painting operations are carried out in the aircraft painting hangar, fresh air needs to be introduced from the outside. At this time, the electric return air valve is closed, the electric fresh air valve 102 is opened, and the surface cooler 401, the indirect heat exchange combustion unit 501 and the blower 700 are started. Under the action of the blower 700, the fresh air from the outside enters through the fresh air section 100, then passes through the return air section 200, then through the primary and secondary filter section 300 for filtration, and then through the surface cooler water baffle section 400 for cooling and dehumidification, so that the airflow is processed to 12-15℃ and the moisture content is 8-10g / kg. Then it is heated by the air heating section 500. In this embodiment, the air heating section 500 heats the air by a temperature rise of ΔT = 13-16℃. The heated air is finally sent into the aircraft painting hangar by the blower 700. The air supply volume of the blower 700 needs to be controlled to maintain a slight negative pressure of -10Pa to -5Pa in the aircraft painting hangar.

[0045] When no painting work is being carried out in the aircraft painting hangar, and the humidity inside the hangar is too high and dehumidification is required, the electric fresh air valve 102 is closed and the electric return air valve is opened. Under the action of the blower 700, the air inside the aircraft painting hangar will circulate through the primary and secondary efficiency filter section 300, the surface cooling water baffle section 400 and the air heating section 500 for filtration, cooling, dehumidification and heating, so that the humidity of the air inside the aircraft painting hangar reaches the required range.

[0046] The overall energy efficiency ratio of the air supply unit for the aircraft painting hangar in this embodiment can be improved to 3.8-4.2 (52% higher than the traditional system), and the humidity control accuracy can reach ±2%RH (meeting the NIST Class A standard). When dealing with extreme humidity, it can reduce the RH condition from 90% to the set value within 1 hour.

[0047] The above embodiments of this utility model are not intended to limit the scope of protection of this utility model. The implementation of this utility model is not limited thereto. All other modifications, substitutions or alterations made to the above structure of this utility model based on the above content of this utility model and in accordance with the common technical knowledge and conventional means in the field, without departing from the basic technical idea of ​​this utility model, shall fall within the scope of protection of this utility model.

Claims

1. An air supply unit for an aircraft paint spraying hangar with dehumidification function, characterized in that: The system includes, in sequence, a fresh air section, a return air section, a primary and secondary filter section for filtering the flowing air, a surface cooling and water-blocking section for cooling the flowing air and intercepting condensed water droplets, an air heating section for heating the flowing air, an air outlet section, and a blower. The fresh air section is used for the intake of outside air, and an electric fresh air valve is installed at the air outlet of the fresh air section. The air inlet of the return air section is used to connect with the air outlet of the aircraft paint hangar, and an electric return air valve is installed between the air inlet of the return air section and the air outlet of the aircraft paint hangar. The air outlet of the blower is connected to the air inlet of the aircraft paint hangar.

2. The aircraft paint spraying hangar ventilation unit with dehumidification function according to claim 1, characterized in that: The primary and secondary filtration sections include a primary filter of grade G4 and a secondary filter of grade F5 or F7.

3. The aircraft paint spraying hangar ventilation unit with dehumidification function according to claim 1, characterized in that: The surface cooler water baffle section includes a surface cooler and a water baffle plate located behind the surface cooler.

4. The aircraft paint spraying hangar ventilation unit with dehumidification function according to claim 1, characterized in that: The air heating section includes a duct heater.

5. The aircraft paint spraying hangar ventilation unit with dehumidification function according to claim 1, characterized in that: A check valve is installed at the air inlet of the blower.

6. The aircraft paint spraying hangar ventilation unit with dehumidification function according to claim 1, characterized in that: The air inlet of the fresh air section is equipped with rainproof louvers and insect-proof netting.

7. The aircraft paint spraying hangar ventilation unit with dehumidification function according to claim 1, characterized in that: It includes two air supply channels arranged side by side, and each of the two air supply channels is equipped with a fresh air section, a return air section, a primary and secondary filter section, a surface cooling water baffle section, an air heating section, an air outlet section, and a blower.

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