Unpowered local ventilation cooling device for mine

Abstract

An unpowered local ventilation cooling device for a mine comprises a press-in type local ventilator, an air duct, an air inlet, a hanging hole, an ice block adding hole, an air outlet, a porous reducer pipe, a box body and a drainage pipe. The large-caliber end of the porous reducer pipe is an air inlet, and the small-caliber end is an air outlet; an ice block adding hole is formed in the middle section of the top of the box body, hanging holes are formed in the tops of two ends, and a drain pipe for discharging condensate water generated by ice block melting is arranged at the bottom; the multi-hole reducer pipes are sleeved with the box body, the box body is hung on a roadway top plate, the box body is connected with an air duct of a press-in type local ventilator in a sealed mode, air flow enters from a large-diameter air inlet of each multi-hole reducer pipe and then is sent out to a working face from a small-diameter air outlet, the air speed can be increased in a multiplied mode, and meanwhile ice blocks are filled among the multi-hole reducer pipes from ice block adding holes of the box body. The device can perform ice block physical cooling, finally quickly take away heat of the working face and reduce the sensible temperature of operators, does not need to specially increase cooling air volume, does not need to consume extra energy, and has the advantages of being capable of solving the problem of heat damage of the local working face of the mine, effectively reducing the local environment temperature and the sensible temperature of the operators, low in preparation and operation cost and the like.

Description

Technical Field

[0001] This invention relates to the field of mine ventilation technology, and in particular to a non-powered local ventilation and cooling device for mines. Background Technology

[0002] Currently, with the extension of mining depth and the widespread use of high-powered underground operating equipment, the underground ambient temperature is also increasing. The high temperature environment at the working face seriously affects the physical and mental health of workers, reduces labor efficiency, and also has an adverse effect on operating equipment. Studies have shown that for every 1°C increase in working face temperature above the standard, worker productivity decreases by 6-8%, and when the temperature exceeds 28°C, the incidence of underground accidents increases by 20%.

[0003] Currently, underground cooling technologies mainly fall into two categories: non-artificial refrigeration and artificial refrigeration. Non-artificial refrigeration is more commonly used, and its most effective method is to improve the ventilation system and increase airflow. However, when the surrounding rock temperature reaches a certain level, the cooling effect of increasing airflow is limited, and it cannot fundamentally solve the heat hazard problem. At this point, effective artificial refrigeration technology is needed, but this technology requires large investments and consumes a lot of energy, resulting in high operating costs that most mines cannot afford. Furthermore, mine air conditioning and other artificial refrigeration equipment are affected by the harsh underground environment, resulting in poor operating performance and frequent equipment damage and repairs.

[0004] To address the aforementioned issues, several publications have revealed CN110486078A, "Local Ventilation and Cooling Device for Underground Mines," which describes an artificial cooling method. This device includes a forced-flow fan, a sheet metal air box, and a cooling chamber. The forced-flow fan is connected to the sheet metal air box. A cooling pipe is spirally installed inside the cooling chamber. One end of the cooling pipe is connected to a water inlet pipe with an inlet valve. The other end of the cooling pipe is connected to a connecting pipe that extends through the side wall of the sheet metal air box and connects to an output pipe. The output pipe has evenly spaced water outlets, each connected to a nozzle. One end of the water inlet pipe and the connecting pipe is... Inside the cooling box, the other ends of the inlet pipe and connecting pipe pass through the top wall of the cooling box, and the other ends of the inlet pipe and connecting pipe are installed outside the cooling box; a disc cooler is installed at the bottom of the cooling box, the upper side wall of the cooling box is connected to the inlet pipe, and a control valve is installed on the inlet pipe; the lower side wall of the cooling box is connected to the drain pipe, and a drain valve is installed on the drain pipe. It can use the cold water pipe inside the cooling box to circulate for cooling, but it requires a lot of electricity and well water resources, and the operating cost is extremely high; CN118070381A "A method for selecting a local cooling fan for a working face" This technology involves the selection method and simulation model of refrigeration fans, but does not involve specific devices.

[0005] Therefore, it is of great significance to develop a non-powered local ventilation and cooling device for mines. Summary of the Invention

[0006] The objective of this invention is to overcome the shortcomings of the prior art and provide a non-powered local ventilation and cooling device for mines, which can improve the high-temperature environment of local underground operations and save energy and reduce costs in controlling local high-temperature heat hazards in mines.

[0007] The objective of this invention is achieved through the following technical solution:

[0008] The non-powered local ventilation and cooling device includes a forced-flow local ventilator and a duct. It also includes an air inlet, a hanging hole, an ice-adding hole, an air outlet, a multi-hole reducer, a housing, and a drain pipe. The large-diameter end of the multi-hole reducer is the air inlet, and the small-diameter end is the air outlet. The housing has an ice-adding hole in the middle of the top, hanging holes at both ends, and a drain pipe at the bottom for draining condensate from melting ice. The multi-hole reducer is fitted into the housing, which is then suspended from the roof of the tunnel. The housing is sealed by the duct of the forced-flow local ventilator. Airflow enters from the large-diameter inlet of the multi-hole reducer and is then delivered to the working face from the small-diameter outlet, increasing the air velocity several times. Simultaneously, ice is added between the multi-hole reducers through the ice-adding hole in the housing, providing physical cooling and ultimately quickly removing heat from the working face, reducing the perceived temperature for workers.

[0009] Compared with the prior art, the present invention has the following advantages or effects:

[0010] Because the power source is the existing local ventilation fan in the mine, and there is no need to increase the cooling air volume, no additional energy is required, thus solving the problem of heat damage in local working faces of the mine. At the same time, because the local ventilation speed of the ventilation duct is increased and the airflow is locally cooled by ice, it can effectively reduce the local ambient temperature and the perceived temperature of the workers. In addition, because the device is simple and compact, the manufacturing and maintenance costs are low.

[0011] The innovation of this invention lies in:

[0012] (1) "Powerless" energy-saving design: The device itself does not require any additional power source (such as electricity or compressed air), and works entirely by utilizing the pressure energy of the existing ventilation system in the mine, which greatly saves energy consumption and operating costs.

[0013] (2) Organic integration of “speed increase” and “temperature reduction”: By using the built-in variable diameter pipe group, the wind energy of the ventilator is converted into a jet that increases the speed by nearly 100%, which enhances the wind speed on the working surface and reduces the perceived temperature of the human body. At the same time, the ice blocks are used to directly cool the high-speed airflow by 3°C, thus achieving dual regulation of “wind speed + temperature”.

[0014] (3) Simple structure, low cost and strong applicability: The core components are made of PVC material, modular design, lightweight, durable and low cost, easy to install, transport and maintain, can be quickly adapted to existing ventilation duct systems of different specifications, and are not affected by the harsh production conditions in the well.

[0015] (4) Green and environmentally friendly cooling method: Compared with artificial cooling technologies such as mine air conditioning and cold water circulation that require a lot of electricity and water resources, this device only uses the Venturi effect to increase wind speed and appropriately add ice to absorb heat through phase change. It is a low-cost physical phase change cooling solution that is environmentally friendly and in line with the development concept of green mines.

[0016] In summary, this invention combines variable diameter speed increase with physical cooling of ice blocks, integrating a non-powered device to effectively solve the problem of heat damage in local working faces of mines with extremely low cost and energy consumption. Attached Figure Description

[0017] Figure 1 A three-dimensional perspective diagram of a non-powered local ventilation and cooling device for a mine.

[0018] Figure 2 for Figure 1 The diagram shows a top view of a mine's non-powered local ventilation and cooling device.

[0019] Figure 3 for Figure 1 The diagram shows a front view of a mine's non-powered local ventilation and cooling device.

[0020] Figure 4 for Figure 1 The diagram shows a side view of a mine's non-powered local ventilation and cooling device.

[0021] Figure 5 This is a schematic diagram of the on-site installation of a non-powered local ventilation and cooling device for mines proposed in this invention.

[0022] The symbols in the attached diagram represent:

[0023] 1. Forced-in local ventilation fan 2. Air duct 3. Large-diameter air inlet 4. Housing 5. Perforated reducer 6. Suspension hole 7. Ice inlet 8. Small-diameter air outlet 9. Drain pipe

[0024] The present invention will now be described in further detail with reference to the accompanying drawings. Detailed Implementation

[0025] As attached Figures 1-5As shown, a mine-type non-powered local ventilation and cooling device includes a forced-flow local ventilator and a duct. It also includes an air inlet 1, a hanging hole 2, an ice-adding hole 3, an air outlet 4, a multi-hole reducer 5, a housing 6, and a drain pipe 7. The larger diameter end of the multi-hole reducer 5 is the air inlet 1, and the smaller diameter end is the air outlet 4. The housing 6 has an ice-adding hole 3 in the middle of the top, hanging holes 2 at both ends, and a drain pipe 7 at the bottom for draining condensate from melting ice. The variable diameter pipe 5 is inserted into the box body 6, and the box body 6 is suspended from the roof of the roadway. The box body 6 is sealed by the air duct 2 of the forced local ventilation fan 1. The airflow enters from the large diameter air inlet 1 of the variable diameter pipe 5 and is then sent to the working face from the small diameter air outlet 4. The air velocity can be increased several times. At the same time, ice is filled between each variable diameter pipe 5 through the ice adding hole 3 of the box body 6, which can also carry out physical cooling of the ice and finally quickly remove the heat from the working face and reduce the perceived temperature of the workers.

[0026] The apparatus of the present invention may further be:

[0027] The porous reducing pipe 5 is made of PVC material. The number of holes in the porous reducing pipe 5 is determined according to the heat exhaust wind speed requirements of the work site. The diameter ratio of the large-diameter air inlet 1 to the small-diameter air outlet 4 is also determined according to the heat exhaust wind speed of the work site.

[0028] The housing 6 can be built with several sections of porous variable diameter pipes 5 according to the length of the working surface. The porous variable diameter pipes 5 are connected in a sealed manner with the air inlet 1 of one section connected to the air outlet 4 of the next section.

[0029] The amount of ice added through the ice adding hole 3 should be enough to fill the gaps between the several porous reducing pipes 5 inside the box 6. The water from the melting ice will be discharged through the drain pipe 7. When no more water comes out of the drain pipe 7, ice needs to be added again.

[0030] The ice blocks are pre-made by a surface ice-making machine and transported to the underground working face.

[0031] Comparative Example 1

[0032] A comparative test was conducted with the device of this invention not installed at the end unit, using a 0.8m ventilation duct and a 55kW local fan.

[0033] Example 1

[0034] The device of this invention was installed at the end, and a comparative test was conducted using a 0.8m duct and a 55kW local fan. (Comparative Example 2)

[0035] A comparative test was conducted with the device of this invention not installed at the end unit, using a 0.8m ventilation duct and a 55kW local fan.

[0036] Example 2

[0037] The device of this invention was installed at the end of the circuit for comparative testing, using a 0.8m ventilation duct and a 55kW local fan.

[0038] The monitoring results for each case are as follows:

[0039] Table 1. Detection results of Comparative Example 1

[0040] Measurement point number Distance from ventilation duct outlet (m) Outlet jet velocity (m / s) Dry bulb temperature of the working surface (°C) Wet-bulb temperature of the working surface (°C) 1 2 2.4 29.1 25.3 2 4 2 29.2 25.4 3 6 1.5 29.5 25.5 4 8 0.8 29.8 25.6

[0041] Table 2 Detection results of Example 1

[0042] Measurement point number Distance from the outlet of the ventilation and cooling device (m) Outlet jet velocity (m / s) Dry bulb temperature (°C) Wet-bulb temperature (°C) 1 2 4.3 26.3 22.6 2 4 3.1 26.5 22.7 3 6 2.2 26.9 22.9 4 8 1.5 27.2 23.1

[0043] Table 3 Detection results at ratio 2

[0044] Measurement point number Distance from ventilation duct outlet (m) Jet velocity at the ventilation duct outlet (m / s) Dry bulb temperature (°C) Wet-bulb temperature (°C) 1 2 2.8 28.8 24.9 2 4 2.3 28.9 25.0 3 6 1.8 29.1 25.1 4 8 1.2 29.4 25.2

[0045] Table 4 Detection results of Example 2

[0046] Measurement point number Distance from the outlet of the ventilation and cooling device (m) Outlet jet velocity (m / s) Dry bulb temperature (°C) Wet-bulb temperature (°C) 1 2 5.1 25.6 22.7 2 4 4.2 25.9 22.9 3 6 3.1 26.3 23.2 4 8 2.1 26.5 23.5

[0047] As can be seen from the test results of the embodiments and comparative examples, after the device of the present invention is installed at the end of the local ventilation fan duct, the jet wind speed at the end of the duct increases by nearly 1 times and the temperature decreases by at least 3°C.

[0048] As described above, the present invention can be well implemented. The above embodiments are only the best implementations of the present invention, but the implementation of the present invention is not limited to the above embodiments. Other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention should be considered equivalent substitutions and are all included within the protection scope of the present invention.

Claims

1. A mine non-powered local ventilation and cooling device, comprising a forced-flow local ventilator and an air duct, characterized in that... It also includes an air inlet (1), a hanging hole (2), an ice adding hole (3), an air outlet (4), a multi-hole reducer (5), a housing (6), and a drain pipe (7); the large diameter end of the multi-hole reducer (5) is the air inlet (1), and the small diameter end is the air outlet (4); the housing (6) has an ice adding hole (3) in the middle of the top, hanging holes (2) at both ends, and a drain pipe (7) at the bottom for draining the condensate produced by melting ice; the multi-hole reducer (5) is fitted into the housing (6). Inside, the box (6) is suspended on the roof of the roadway and the box (6) is sealed with the air duct (2) of the forced local ventilation fan (1). The airflow enters from the large diameter air inlet (1) of the multi-hole reducer (5) and is then sent out to the working face from the small diameter air outlet (4). The wind speed can be increased several times. At the same time, ice is filled between each multi-hole reducer (5) through the ice addition hole (3) of the box (6), which can also carry out physical cooling of the ice and finally quickly remove the heat from the working face and reduce the temperature felt by the workers.

2. The apparatus according to claim 1, characterized in that: The box (6) is made of PVC material, which is lightweight and easy to install and transport.

3. The apparatus according to claim 1, characterized in that: The multi-hole reducer (5) is made of PVC material. The number of holes in the multi-hole reducer (5) is determined according to the heat exhaust wind speed requirements of the work site. The diameter ratio of the large-diameter air inlet (1) and the small-diameter air outlet (4) is also determined according to the heat exhaust wind speed of the work site.

4. The apparatus according to claim 1, 2, or 3, characterized in that: The housing (6) can be built with several sections of porous variable diameter pipe (5) according to the length of the working surface. The porous variable diameter pipe (5) is connected to the air inlet (1) of the next section and the air outlet (4) of the next section in a sealed manner.

5. The apparatus according to claim 1, characterized in that: The amount of ice added through the ice adding hole (3) is determined by filling the gap between several porous reducing pipes (5) inside the box (6). The water from the melting ice is discharged through the drain pipe (7). When no water comes out of the drain pipe (7), ice needs to be added again.

6. The apparatus according to claim 4, characterized in that: The ice blocks are pre-made by a surface ice-making machine and transported to the underground working face.

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