CN220689406U - A basalt fiber grating and a water spray chamber for air flow cooling test thereof - Google Patents

Abstract

The utility model belongs to the field of spray cooling, and in particular relates to a basalt fiber grid and a water spray chamber for carrying out wind flow cooling tests. The basalt fiber grid mainly includes a stainless steel outer frame, hexagonal bolts, and two basalt fiber grids located on opposite sides of the frame. A threaded steel pipe, a thin rod used to stabilize the grid structure, and basalt fiber wire. The water spray chamber includes a transparent panel forming a cuboid space, a pressure nozzle, a wind speed sensor, an upwind side temperature and humidity sensor, and a leeward side temperature and humidity sensor located in the cuboid space. During the test, the basalt fiber grid was first built into the water spray chamber. Based on the migration characteristics of the spray droplet group, the droplets from the pressure-type nozzle were sprayed to the surface of the basalt fiber grid. Since the basalt fiber filaments are highly hydrophobic, , which is conducive to the spreading of water film on the surface of basalt fiber grid and the heat exchange between gas and liquid. Finally, the high-temperature air flow passes through the basalt fiber grid and is discharged to achieve the purpose of intensifying the heat and humidity process in the spray chamber.

Description

A basalt fiber grating and a water spray chamber for air flow cooling test thereof

Technical field

The utility model belongs to the field of spray cooling, and particularly relates to a basalt fiber grid plate and a water spray chamber for performing a wind flow cooling test on the basalt fiber grid plate.

Background technique

At present, wet chord plates have a wide range of application scenarios. While being used as a wet filter, the "coolness" of high-temperature airflow passing through the wet chord plates is significantly enhanced.

Regarding the selection of wet string grid materials, stainless steel wire is generally used as the filter component. The hydrophilicity of stainless steel wire makes the formation time of the water film on the string grid shorter, and the water film spreading rate is not high, resulting in gas-liquid contact. The time is short, the heat exchange is insufficient, and the cooling effect of high-temperature air flow is not good; furthermore, because the stainless steel wire does not have good bead-hanging performance, the formation time of the water film will be greatly shortened, and the liquid droplets will slide down when the chord grid is placed vertically. As a result, the water film spreading rate is reduced, and obviously, the gas-liquid two-phase heat exchange time will also be shortened.

Utility model content

In order to solve the problems mentioned in the background technology and make up for the shortcomings of the existing wet chord grid materials, the utility model proposes a basalt fiber grid with a simple structure, low cost and flexible change, and a water spray for conducting wind flow cooling tests on it. The water spray chamber can observe and record in real time the temperature and humidity changes before and after the air flow passes through the basalt fiber grid in the water spray chamber, that is, the cooling effect of high-temperature air flow passing through the basalt fiber grid.

The technical solution of the utility model to solve the above problems is as follows: a chord grid plate wound by basalt fiber wires, mainly including a stainless steel outer frame, two threaded steel pipes, thin rods, and basalt fiber wires.

The first threaded steel pipe is built-in and connected to the inner recess of the I-beam, and the second one is built-in and connected to the inner recess of the opposite I-beam; the threaded steel pipe is fixed by hexagonal bolts; both ends of the thin rod are welded At the middle position of the threaded steel pipe; the basalt fiber filaments are tightly wound along the equidistant threads to make the fiber filaments equidistant.

The water spray chamber is a rectangular space surrounded by transparent acrylic plates; pressure nozzles are installed on the upper and lower sides of the basalt fiber grid, and the outflow mode is horizontal spray; the water spray chamber is provided with a maintenance port. It is convenient to place the basalt fiber grating. The size of the inspection opening is determined by the size of the basalt fiber grating and its installation position. Threaded nails can be installed on both sides of the installation position in the water spray chamber to clamp the I-beams on both sides of the basalt fiber grating. It is firmly secured to prevent the basalt fiber grating from being blown down when affected by wind currents.

The basalt fiber grating is placed into the water spray chamber through the inspection port to carry out the gas-liquid heat and moisture transfer process; a wind speed sensor is provided at the air inlet of the water spray chamber, and temperature and humidity sensors are provided on the upper and lower wind sides of the basalt fiber grating.

During the test, first, the basalt fiber grid is built into the water spray chamber. Based on the characteristics of the spray droplet migration, the pressure nozzle is atomized, and the droplets are sprayed onto the surface of the basalt fiber grid. Since the basalt fiber is highly hydrophobic, the contact angle between the solid and the liquid increases, which is conducive to the spreading of the water film between the basalt fiber and the heat exchange between the gas and the liquid. Then, the high-temperature air flow that passes through the basalt string grid for heat exchange is discharged to achieve the purpose of enhanced cooling.

The beneficial effects of the utility model are: providing a basalt fiber grating, using basalt fiber filaments as string grating filter elements, replacing the stainless steel wires used in the original grating, and increasing the effective spreading area of the water film on the string grating surface. In addition, providing a water spray chamber for conducting wind flow cooling tests on basalt fiber gratings, placing the basalt fiber gratings in the water spray chamber, and observing and recording the temperature and humidity parameters of the high-temperature wind flow before and after passing through the basalt fiber gratings. Replacing different basalt fiber grating specifications (basalt fiber spacing, basalt fiber fiber diameter) and adjusting different installation heights, analyzing the effects of the two experimental variables on the cooling effect of the basalt fiber gratings, and providing a new technical solution for further optimizing the operating conditions of mine ventilation and cooling devices.

Description of drawings

In order to clearly describe the technical solutions in the examples of the present utility model, the accompanying drawings of the examples will be briefly introduced below.

Figure 1 is a schematic structural diagram of a water spray chamber according to an embodiment of the present invention.

Figure 2 is a side view of the position indicated by I in Figure 1.

Figure 3 is a perspective view of a basalt fiber grid according to an embodiment of the present invention.

Figure 4 is an enlarged view of the position indicated by J in Figure 3 .

Figure 5 is a perspective view of the stainless steel outer frame of the basalt fiber grid shown in Figure 3.

In the picture: 1 - wind speed sensor; 2 - basalt fiber grid; 21 - stainless steel frame; 22 - hexagonal bolts; 23 - threaded steel pipe; 24 - thin rod; 25 - basalt fiber wire; 3 ——Pressure type nozzle; 4——Temp and humidity sensor on the upwind side; 5——Temperature and humidity sensor on the leeward side; 6——Water supply device; 7——Threaded nail; 8——Inspection port.

Detailed ways

In order to make the purpose, technical solution and effect of the present utility model clearer and clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described here are only used to explain the present invention and are not intended to limit the present invention.

When the embodiments of the present invention refer to ordinal numbers such as "first" and "second", it should be understood that they are only used for distinction unless they indeed express a sequence according to the context.

In the description of the present utility model, it should be noted that, unless otherwise clearly stated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection or a removable connection. Detachable connection, or integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

Figures 1 and 2 show a water spray chamber for conducting wind flow cooling tests on the above-mentioned basalt fiber grid.

The spray chamber includes a frame, wind speed sensor 1, pressure nozzle 3, upwind side temperature and humidity sensor 4, downwind side temperature and humidity sensor 5, water replenishment device 6, installation screws 7, and inspection port 8.

The frame is made of transparent acrylic panels (transparent panels of other materials can also be used) to form a rectangular space. This embodiment is a cube with a cross-sectional dimension of 570×570 (length×width, mm), and an inspection port 8 is provided on the top pipe wall, with a size of 570×400 (width×height, mm).

The basalt fiber grid plate 2 is placed transversely in the middle of the cuboid space. There are two pressure-type nozzles 3, respectively located on both sides of the basalt fiber grid 2 (in other embodiments, only one pressure-type nozzle 3 can be provided on one side). The pressure nozzle 3 is connected to the water replenishing device 6, so that the water in the water replenishing device 6 is sprayed to the surface of the basalt fiber grid through the pressure nozzle 3. Wind speed sensor 1 is located at the air inlet of the spray chamber and is used to measure the high-temperature wind flow entering the cuboid space. The upwind side temperature and humidity sensor 4 and the downwind side temperature and humidity sensor 5 are respectively located on the upper and leeward sides of the basalt fiber grid 2 and are used to measure real-time temperature and humidity data on the upper and leeward sides of the basalt fiber grid 2 .

Figures 3 to 5 show the structure of the basalt fiber grid in this embodiment. The basalt fiber grid 2 includes a stainless steel outer frame 21, hexagonal bolts 22, two threaded steel pipes 23, thin rods 24, and basalt fiber wires 25. The stainless steel outer frame 21 is rectangular in shape (as shown in Figure 5) and made of stainless steel. The size is determined based on the cross-sectional area of the exhaust duct. The size of the threaded steel pipe 23 is equal in length and the threads are equidistant. The width of the threaded groove is 0.5mm. The spacing between adjacent grooves is 0.5mm and 0.75mm. The material is stainless steel and the diameter of the round pipe does not exceed 5cm. The fiber material is basalt fiber. The diameter of a single basalt fiber 25 is 0.5mm. It has the characteristics of high temperature resistance of 900°C, flame retardancy, and hydrophobicity.

During production, the protective shell covering the threaded steel pipe 23 is removed, the first threaded steel pipe 23 is built in and connected to the concave part of the I-beam on one side, and the second threaded steel pipe 23 is built in and connected to the concave part of the I-beam on the opposite side; the threaded steel pipe 23 is fixed by a hexagonal bolt 22. The two ends of the thin rod 24 are welded to the middle position of the threaded steel pipe. At this time, the I-beams on both sides can be removed. Then put the basalt fiber grid plate 2 horizontally, tie the basalt fiber wire 25 to one end of the threaded steel pipe 23, straighten the basalt fiber wire 25 and wrap it around the same end of the other threaded steel pipe 23, and wrap it along the thread trend at equal intervals to ensure that the basalt fiber wire 25 sinks after being loaded and then rebounds to achieve the purpose of resonance (only part of the basalt fiber wire is drawn in Figures 3 and 4). After winding, use waterproof glue to fix the two sides to prevent the basalt fiber grid plate from being loosened as a whole due to the breakage of a certain basalt fiber wire 25.

Before the test, put the basalt fiber grid 2 into the water spray chamber from the access port 8 (when putting it in, rotate it 90 degrees in Figure 3 so that the top side I-beam faces forward and downwards from the top of the water spray chamber in Figure 1 put into a). The threaded nails 7 are installed in parallel on the side wall of the water spray chamber, so that the basalt fiber grid plate 2 can be stably placed horizontally inside the water spray chamber and not easily shaken under the impact of high-temperature wind flow. The wind speed sensor 1 is installed in the upwind section of the pressure nozzle 3, and the temperature and humidity sensors 4 and 5 are respectively installed on the upwind and downwind sides of the position where the basalt fiber grid 2 is placed, so as to facilitate the observation of the temperature and humidity before and after the high-temperature wind flow passes through the basalt fiber grid 2 The changing situation is more intuitively reflected in the intensification of the heat and moisture process in the basalt fiber grid 2 in the spray chamber.

The specific test steps of this example are as follows.

First, when using the basalt fiber grating 2, open the exhaust duct inspection port 8, push the basalt fiber grating 2 into the water spray chamber, and tighten the threaded nails 7 to fix the position of the basalt fiber grating 2.

Then, the inspection port 8 is closed, and after the high-temperature air flow enters the exhaust duct, the wind speed sensor 1 measures the air flow inlet speed.

Then, the water replenishing device 6 is turned on, and the pressure type nozzle 3 flows out horizontally. The liquid droplets are broken by the disturbance of the wind flow, resulting in secondary atomization. The mist droplets are sprayed to the surface of the basalt fiber grid 2 to form a water film. Since the basalt fiber filaments 25 are hydrophobic Water material, the free energy between solid and liquid phases increases, which increases the droplet contact angle. Compared with the original wet string grid plate, the water film filling rate is higher. Further, the high-temperature wind flow and the water film undergo convective heat exchange, and the temperature and humidity sensors 4 and 5 are used to read the real-time temperature and humidity data on the upper and downwind sides of the basalt fiber grid.

In addition, different specifications of the basalt fiber grid 2 were replaced and their different installation positions in the water spray chamber were adjusted to analyze the influence of the above two experimental variables on the heat and moisture process of the basalt fiber grid reinforcement.

The above is an implementation method provided in combination with specific content, and it is not considered that the specific implementation of the utility model is limited to these descriptions. At the same time, due to different industry names, it is not limited to the above names, nor is it limited to English names. Any method, structure, etc. similar to or identical to the method, structure, etc. of the utility model, or a number of technical deductions or replacements made on the premise of the concept of the utility model, shall be regarded as the protection scope of the utility model.

Claims (9)

1. A basalt fiber grating, characterized in that it comprises a stainless steel outer frame (21), two threaded steel pipes (23), and basalt fiber filaments, wherein the two threaded steel pipes (23) are fixed to opposite sides of the stainless steel outer frame (21), and the basalt fiber filaments are tightly wound along the equidistant threads of the two threaded steel pipes (23), so that the basalt fiber filaments are equidistantly formed into a grating. 2. The basalt fiber grid according to claim 1, characterized in that it also includes a thin rod (24), and the thin rod (24) is welded between two threaded steel pipes (23). 3. The basalt fiber grid according to claim 1, characterized in that the stainless steel outer frame (21) fixes the position of the threaded steel pipe (23) through hexagonal bolts (22). 4. The basalt fiber grating according to claim 1, characterized in that: a waterproof glue for bonding and fixing the basalt fiber filaments to the threaded steel pipe (23) is provided on the outer side of each threaded steel pipe (23). 5. A water spray chamber for conducting wind flow cooling tests on the basalt fiber grid as claimed in any one of claims 1 to 4, characterized in that the water spray chamber includes a transparent panel forming a cuboid space and a transparent panel located in the cuboid space. Pressure nozzle, wind speed sensor, upwind side temperature and humidity sensor, downwind side temperature and humidity sensor; the basalt fiber grid is placed transversely in the middle of the cuboid space, the pressure nozzle is located on one side of the basalt fiber grid, and the pressure nozzle is connected with a water supply device. The water in the water supply device is sprayed to the surface of the basalt fiber grid through the pressure nozzle; the wind speed sensor is located at the air inlet of the water spray chamber and is used to measure the high-temperature wind flow entering the cuboid space; the upwind side temperature and humidity sensor and the downwind side temperature and humidity sensor are respectively Located on the leeward side of the basalt fiber grid, it is used to measure real-time temperature and humidity data on the basalt fiber grid and the leeward side. 6. The water spray chamber according to claim 5, characterized in that: the transparent panel is a transparent acrylic panel. 7. The water spray chamber according to claim 5, characterized in that: the water spray chamber is provided with an access port for placing the basalt fiber grid into the water spray chamber. 8. The spray chamber according to claim 7, characterized in that a plurality of threaded nails (7) are provided on both sides of the spray chamber for stably placing the basalt fiber grid plate horizontally inside the spray chamber. 9. The water spray chamber according to claim 5, characterized in that: there are two pressure-type nozzles, which are arranged on both sides of the basalt fiber grid.