A device for collecting and discharging micro water mist in a limited space

Abstract

The application provides a small water mist gathering and discharging device in a limited space and belongs to the technical field of icing test devices. The application solves the problem of how to verify a small water mist gathering and discharging device in a limited space and prevent water mist from entering an external low-temperature space. The device comprises an air duct heater, a centrifugal fan, a diffuser pipe and a filter screen. The air duct heater, the centrifugal fan and the diffuser pipe are sequentially connected. The diffuser pipe is provided with the filter screen at an air outlet. The air duct heater is arranged at the lower part of a test cabin. The air blower is arranged at the upper part of the test cabin and located at the opposite side of the air duct heater. The heater of the application gathers water mist in air by a heating rod, melts the ice layer formed by heating and then filters by using a nylon screen, so that the device for removing water mist in air is finally obtained. The device has excellent anti-icing and deicing performance and can be widely applied to winter ventilation equipment which is prone to icing and blockage, so that the device has a wide market prospect.

Description

Technical Field

[0001] This invention belongs to the technical field of icing test devices, and in particular relates to a device for the collection and discharge of tiny water mist in a confined space. Background Technology

[0002] In the spray icing test conducted in the test chamber, the continuous accumulation of mist sprayed from the nozzles inside the chamber can interfere with the test results. Therefore, it is necessary to use circulating air to remove excess mist from the test chamber. At the same time, in order to minimize the impact of the exhaust air on the external low-temperature space and to prevent supercooled droplets in the low-temperature air from freezing, accumulating, and damaging the equipment surfaces and causing other corrosive effects, a device is required to remove supercooled droplets contained in the low-temperature air, namely a demister.

[0003] If the demister is placed directly in the spray icing test space, the fog will still fill the entire test chamber after the test begins. Compared to the case without a demister, the fog concentration will be lower, but the effects of fog accumulation cannot be eliminated, and the fog inside the test chamber will still enter the external low-temperature space. Therefore, the demister should be placed at the outlet of the circulating air in the spray icing test space to filter all low-temperature air containing supercooled droplets that enters the external low-temperature space.

[0004] In existing dehumidification technologies, demisters use a fan to draw humid air into the machine. Through a heat exchanger, water molecules in the air condense into water droplets, and the treated dry air is then expelled from the machine. This cycle repeats to maintain the dehumidified space within a set relative humidity level. It can be seen that the dehumidification capacity of demisters is very small, only suitable for dehumidifying high-humidity air with a high water content. They cannot be used for removing droplets from low-temperature air containing a large number of supercooled droplets, as in spray icing tests. Furthermore, supercooled droplets in low-temperature air can condense and accumulate after impacting the heat exchanger, easily clogging gas passages and damaging the heat exchanger.

[0005] If we consider supercooled droplets in low-temperature air as solid impurities in the air, we can consider using dust removal technology. Existing dust removal equipment is divided into dry dust removal and wet dust removal. Dry dust removal equipment, such as settling chambers, inertial dust collectors, and cyclone dust collectors, is designed to utilize the inertia or gravity of dust particles. However, it also faces the problem of supercooled droplets in low-temperature air icing and accumulating on object surfaces, blocking gas passages. Wet dust collectors, such as spray towers, scrubbers, impact dust collectors, and venturi scrubbers, rely on hydrophilicity to separate and capture dust particles. They are larger in size and footprint, require more auxiliary systems, and are more expensive, making them unsuitable for cloud removal scenarios in spray icing experiments.

[0006] In summary, the demister needs to have a heating function to melt and remove the ice layer formed by the freezing and accumulation of supercooled droplets on the surface of the object, prevent the airflow channel from being blocked, and be placed at the outlet of the circulating air in the test space to prevent water mist from entering the external low-temperature space. Summary of the Invention

[0007] In view of this, in order to solve the technical problems mentioned in the background art, the present invention proposes a device for the collection and discharge of micro water mist in a limited space.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: a device for collecting and discharging micro water mist in a confined space, comprising a duct heater, a centrifugal fan, a diffuser, and a filter screen, wherein the duct heater, centrifugal fan, and diffuser are connected in sequence, and a filter screen is installed at the air outlet of the diffuser. The duct heater is installed at the lower part of the test chamber, and the blower is installed in the test chamber and located at the upper part opposite to the duct heater.

[0009] Furthermore, a filter screen is also installed at the inlet of the blower.

[0010] Furthermore, the filter screen is made of 1000-mesh nylon mesh.

[0011] Furthermore, the duct heater includes a housing and several flow-around heating rods, with several flow-around heating rods arranged longitudinally inside the housing.

[0012] Furthermore, the outer casing of the air duct heater uses cold storage polyurethane insulation panels.

[0013] Furthermore, five flow-flow heating rods are arranged longitudinally inside the outer shell, divided into two rows, with a spacing of 150mm between the two rows and a spacing of 200mm between the two flow-flow heating rods in each row.

[0014] Furthermore, the heating power of a single flow-flow heating rod is 400W, and its dimensions are 20mm in diameter × 500mm in length. The upper 100mm has no heating function and is placed inside the outer shell, while the lower 400mm has a heating function and is in contact with low-temperature air.

[0015] Furthermore, the front bottom of the air duct heater is provided with a baffle plate, forming an internal groove for water storage. An air duct hole is opened on the rear side for connecting to the downstream centrifugal fan, and a drain hole is opened at the bottom for connecting to the drain pipe. A heating plate is installed in the internal groove to prevent the water stored at the bottom from freezing and clogging. The heating plate has a single heating power of 200W and is equipped with a thermostat for temperature adjustment and control.

[0016] Furthermore, the maximum air volume of the centrifugal fan is 3517 m³ / h. 3 The blower has a capacity of 2.2kW per hour and a maximum air volume of 3000m³ / h. 3The centrifugal fan has a capacity of 350W and is matched with a frequency converter with a corresponding power of 4kW to adjust the circulating air volume. The air volume of the centrifugal fan is greater than that of the blower, so that the pressure inside the test chamber is less than the pressure of the external low-temperature space, ensuring that there is no airflow backflow at the blower.

[0017] Furthermore, the overall dimensions of the air duct heater are 800mm wide × 700mm high × 400mm thick, and the internal air circulation space is 600mm wide × 500mm high × 300mm thick.

[0018] Compared with the prior art, the beneficial effects of the micro water mist collection and discharge device in a confined space described in this invention are:

[0019] For the removal of water mist (supercooled droplets) in air containing low-temperature water mist within a confined space, existing dehumidification technologies suffer from very small removal volumes and are prone to icing and clogging of dust removal equipment. This invention addresses this issue by proposing a device based on the principle of airflow around objects and the impact of low-temperature water mist to form ice. This device uses a heating rod in a duct heater to collect water mist in the air, heats and melts the ice layer formed, and then uses a nylon mesh with a flow aperture of approximately 11.6±1.2μm for filtration to ultimately remove water mist from the air. It has excellent anti-icing and de-icing performance and can be widely used in ventilation equipment that is prone to icing and clogging in winter, with broad market prospects. Attached Figure Description

[0020] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0021] Figure 1 This is a schematic diagram of the structure of the micro water mist collection and discharge device in a confined space according to the present invention;

[0022] Figure 2 This is a schematic diagram showing the connection and relative position between the micro water mist collection and discharge device in a confined space and the test chamber described in this invention.

[0023] Figure 3 This is a schematic diagram of the structure of the air duct heater.

[0024] In the diagram: 1-blower, 2-background fan array, 3-honeycomb panel, 4-screen, 5-spray rack, 6-lift, 7-test specimen, 8-temperature sensor, 9-humidity sensor, 10-duct heater, 11-centrifugal fan, 12-diffuser, 13-test chamber, 14-filter, 15-flow heating rod, 16-baffle, 17-internal groove, 18-duct hole, 19-heating plate, 20-drain hole. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other, and the described embodiments are only some embodiments of the present invention, not all embodiments.

[0026] See Figure 1-3 This embodiment describes a device for collecting and discharging minute water mist in a confined space, comprising a duct heater 10, a centrifugal fan 11, a diffuser 12, and a filter 14. The duct heater 10, centrifugal fan 11, and diffuser 12 are connected in sequence. A filter 14 is installed at the air outlet of the diffuser 12. The duct heater 10 is installed at the lower part of the test chamber 13, and the blower 1 is installed in the test chamber 13 and located at the upper part opposite to the duct heater 10.

[0027] This invention provides a test device capable of collecting, heating, melting, and discharging supercooled droplets in low-temperature cloud-like air within a spray icing test space. Combined with airflow circulation, it effectively solves the problems of cloud accumulation and inability to directly discharge fog during spray icing tests within the test chamber. The structural diagram of the device for collecting and discharging micro-water mist within a confined space is shown below. Figure 1 .

[0028] according to Figure 1 As can be seen, the low-temperature air containing mist first enters the air duct heater 10, where the surrounding heating rod 15 filters out most of the supercooled droplets. After being supplied with sufficient pressure head by the centrifugal fan 12, it enters the diffuser 13 for pressurization and deceleration. Finally, the nylon mesh at the outlet of the diffuser 13 filters out any remaining droplets in the air before it enters the external low-temperature space. The connection method and relative position of the micro-water mist collection and discharge device in the confined space with the spray icing test space and the external low-temperature space are as follows: Figure 2 As shown.

[0029] Based on the spray volume within test chamber 13, the water flow rate of a single nozzle ranges from 2.0 to 19.6 L / h, and the air flow rate ranges from 13 to 45 NL / min. The maximum water flow rate of the four nozzles is approximately 80 L / h, and the maximum air flow rate is approximately 2.7 m³ / h. With a water temperature of 5°C and an air temperature of 25°C, the total heat release when the test chamber is cooled to -10°C is 8.41 kW. The external cold air temperature is selected as -20°C, which is then heated to -10°C upon entering test chamber 13, carrying away the 8.41 kW of heat release. The required circulating air flow rate is approximately 2330 m³ / h. 3 / h.

[0030] To allow for some margin, a maximum air volume of 3517m³ / h was selected. 3 / h, centrifugal fan 11 with a power of 2.2kW and an air volume of 3000m³ 3An axial flow fan with a capacity of 350W / h is used for exhaust and supply air respectively, and a frequency converter with a corresponding power of 4kW is matched to adjust the circulating air volume. It should be noted that the exhaust air volume is slightly greater than the supply air volume, so that the pressure inside the test chamber 13 is lower than the pressure of the external low-temperature space, ensuring that there is no airflow backflow at the supply fan 1.

[0031] Based on the maximum spray rate of 80 L / h, 10% of this is taken as the portion that needs to be heated and melted after icing by impacting the heating rod through the duct heater 10. The required heating amount can be calculated to be approximately 0.86 kW. Considering the low-temperature gas cooling and a certain margin, the heating power is increased to 2 kW. The structure of the duct heater is as follows... Figure 3 As shown, the overall dimensions are 800mm wide × 700mm high × 400mm thick, and the internal air circulation space is 600mm wide × 500mm high × 300mm thick.

[0032] The duct heater 10 contains five circulating heating rods 15 arranged in two rows with a spacing of 150mm between the two rows. The spacing between two circulating heating rods in each row is 200mm. Each circulating heating rod has a heating power of 400W and dimensions of 20mm in diameter × 500mm in length. The upper 100mm section is not heated and is placed inside the insulation plate, while the lower 400mm section is heated and comes into contact with the low-temperature air.

[0033] The duct heater 10 has a 3cm high baffle 16 at the bottom front, forming an internal groove 17 for water storage. A duct opening 18 with a diameter of 370mm is located at the rear for connecting to the downstream centrifugal fan 11. A drain hole 20 with a diameter of 50mm is located at the bottom for connecting to a drain pipe. Two 300mm × 300mm silicone rubber heating plates 19 are also installed to prevent the bottom water from freezing and clogging. Each heating plate 19 has a heating power of 200W and is equipped with a thermostat for temperature adjustment and control. The actual total heating power of the duct heater 10 is 2.4kW.

[0034] The outer casing of the air duct heater 10 uses cold storage polyurethane insulation panels to reduce heat loss.

[0035] The outlet of the air duct heater 10 is connected to the inlet of the centrifugal fan 11 via a flexible air duct, and the centrifugal fan 11 provides the flow power. The outlet of the centrifugal fan 11 uses 1000-mesh nylon mesh for final filtration, with a flow aperture of approximately 11.6±1.2μm, which can filter more than 95% of the spray droplets in the 10-100μm particle size range generated by the air atomizing nozzle.

[0036] The outer shell of the test chamber 13 is constructed and sealed using aluminum profiles and PVC materials. An axial flow fan 1 and a centrifugal fan 11 are respectively located on the front and rear sides. A duct heater 10 is positioned upstream of the centrifugal fan 11 to intercept and melt some supercooled droplets, preventing the duct from freezing when cold air carrying low-temperature water mist passes through the centrifugal fan 11. To prevent water mist leakage from the sealed space, nylon mesh filters are used at the inlet of the fan 1 and the outlet of the centrifugal fan 11, and the water mist treatment process is monitored.

[0037] The working principle of the micro water mist collection and discharge device in a confined space described in this invention is as follows:

[0038] If the nylon mesh is directly connected to the outlet of the centrifugal fan 11, its flow area will be reduced to 1 / 25 of the original, the wind resistance will increase sharply, the suction volume of the centrifugal fan 11 will be very small, and airflow backflow will occur at the inlet of the blower. Therefore, a diffuser 13 needs to be connected to the outlet of the centrifugal fan 11 to increase the flow area before connecting the nylon mesh, thereby reducing wind resistance and ensuring that the suction volume is greater than the supply volume. Due to space constraints, the area of ​​the 328mm×298mm fan outlet is increased to 1.0m×1.0m, increasing the flow area to 10 times the original size.

[0039] In actual experiments, it was found that when the outlet of centrifugal fan 11 was not connected to diffuser pipe 13, the suction volume of centrifugal fan 11 was small, and there was backflow at the inlet of blower 1. After the experiment, water mist and wetting were observed at the nylon mesh at the inlet of blower 1, and the cloud and fog accumulation in the closed space was very obvious, indicating that the circulating air volume was small and the cloud and fog removal effect was weak.

[0040] After installing the diffuser pipe 13, the suction volume of the centrifugal fan 11 increased. After the cloud and fog removal test, the nylon mesh at the inlet of the blower 1 remained dry, indicating that there was basically no backflow phenomenon in the blower 1. The accumulation of cloud and fog in the enclosed space was reduced, indicating that the cloud and fog removal effect was good.

[0041] The embodiments of the present invention disclosed above are merely illustrative of the invention. These embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention.

Claims

1. A device for collecting and discharging micro-water mist in a confined space, characterized in that: The test chamber includes a duct heater (10), a centrifugal fan (11), a diffuser (12), and a filter screen. The duct heater (10), centrifugal fan (11), and diffuser (12) are connected in sequence. A filter screen is installed at the air outlet of the diffuser (12). The duct heater (10) is installed at the lower part of the test chamber (13), and the blower (1) is installed in the test chamber (13) and located at the upper part on the opposite side of the duct heater (10). The air duct heater (10) includes a shell and a plurality of flow-around heating rods (15), and the shell is provided with a plurality of flow-around heating rods (15) arranged longitudinally inside the shell; Five flow-flow heating rods (15) are arranged longitudinally inside the outer shell, divided into two rows, with a spacing of 150mm between the two rows and a spacing of 200mm between the two flow-flow heating rods (15) in each row. The air duct heater (10) has a baffle (16) at the bottom front side, forming an internal groove (17) for water storage. The rear side has an air duct hole (18) for connecting to the downstream centrifugal fan (11), and the bottom has a drain hole (20) for connecting to the drain pipe. A heating plate (19) is installed in the internal groove (17) to prevent the water stored at the bottom from freezing and blocking. The heating power of a single flow-flow heating rod (15) is 400W, and its size is 20mm in diameter × 500mm in length. The upper 100mm has no heating function and is placed inside the outer shell, while the lower 400mm has a heating function and is in contact with low-temperature air.

2. The device for collecting and discharging micro water mist in a confined space according to claim 1, characterized in that: The inlet of the blower (1) is also equipped with a filter screen.

3. The device for collecting and discharging micro-water mist in a confined space according to claim 1, characterized in that: The outer shell of the air duct heater (10) uses cold storage polyurethane insulation board.

4. The device for collecting and discharging micro-water mist in a confined space according to claim 1, characterized in that: The maximum air volume of the centrifugal fan (11) is 3517m 3 / h, and the power is 2.2kW, the maximum air volume of the air supply fan (1) is 3000m 3 / h, and the power is 350W, and a frequency converter with a corresponding power of 4kW is matched to adjust the circulating air volume, the air volume of the centrifugal fan (11) is greater than that of the air supply fan (1), so that the pressure in the test cabin (13) is less than that of the external low temperature space, and the air flow backflow phenomenon does not exist at the air supply fan (1).

5. The device for collecting and discharging micro water mist in a confined space according to claim 1, characterized in that: The overall dimensions of the air duct heater (10) are 800mm wide × 700mm high × 400mm thick, and the internal air circulation space is 600mm wide × 500mm high × 300mm thick.

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