Air conditioning unit for mine and control method thereof

Abstract

The present invention discloses an air conditioning unit for a mine and a control method thereof. The mine includes two tunneling tunnels and a coal mining area formed by connecting the ends of the two tunneling tunnels. The air conditioning unit includes two air mixing systems, a refrigeration unit for supplying cooling to the air mixing systems, and a cooling tower group for cooling the refrigerant in the refrigeration units. Each tunneling tunnel of the mine is equipped with an air mixing system, and each air mixing system is connected in parallel to the refrigeration unit. The two tunneling tunnels are the first tunneling tunnel and the second tunneling tunnel. The coal mining area is located downstream of the air outlet of the first tunneling tunnel, and the second tunneling tunnel is located downstream of the air outlet of the coal mining area. The air mixing system in the first tunneling tunnel is composed of a main air mixing group and an auxiliary air mixing group connected in parallel. The air mixing system in the second tunneling tunnel is composed of a main air mixing group. The air conditioning unit designed in the present invention can simultaneously meet the usage requirements of the tunneling tunnel, the working face, and the coal mining area.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to an air conditioning unit for a mine and a control method of the air conditioning unit. Background Art

[0002] Mine air conditioning units are air conditioning equipment used inside mines. Their function is to regulate the temperature, humidity, and air composition of the air below, creating a more comfortable and safe environment. Mine air conditioning units typically consist of multiple functional units, such as a cooling unit, a heating unit, a humidification unit, and an air circulation unit. These units can be used individually or in combination to meet the diverse needs of mine air conditioning. Mine air conditioning units have a wide range of applications, including coal mines, metal mines, non-metallic mines, and other mines. Within a mine, air conditioning units can be installed in various locations, such as fresh air lanes, exhaust air lanes, and working faces.

[0003] In recent years, with the development of technology, the technology of mine air conditioning units has also continued to improve. Some advanced mine air conditioning units also use intelligent control technology. They can use sensors to monitor the environmental parameters in the mine in real time and automatically adjust the operating status of the air conditioning unit according to the actual situation to optimize the working environment and safety in the mine.

[0004] For example, the mine air conditioning unit and its control method disclosed in the prior art, such as Figure 1 As shown, the mine air conditioning unit includes: a mixed air system, comprising a multi-stage modular cabinet, movably positioned in the fresh air roadway and / or coal mining area; a refrigeration unit connected to the mixed air system and located within the mine; and a cooling tower connected to the refrigeration unit and located at the exhaust air roadway exit. The control method includes monitoring whether the fresh air roadway is operating; if so, detecting the mine's temperature parameters, which include at least the coal mining area temperature and the fresh air roadway temperature; and controlling the movement of the multi-stage modular cabinet of the mixed air system based on the temperature parameters.

[0005] Although this solution can ensure the comfort of the fresh air tunnel and coal mining face, it still has obvious defects:

[0006] 1. The mixed air system can be movably installed in the fresh air tunnel and / or coal mining area, which makes it difficult to meet the cooling and dehumidification needs of both tunneling tunnels;

[0007] 2. The combination cabinet needs to be moved frequently. The installation structure of the entire mine air-conditioning unit is complicated. In addition, the underground space is limited, and disassembly and installation are more troublesome.

[0008] Therefore, how to design an air-conditioning unit for both coal mining face and heading tunnel and its control method is a technical problem that needs to be solved urgently in the industry. Summary of the Invention

[0009] In order to solve the defect that the existing mine air conditioning is difficult to meet the use requirements of two heading tunnels, the present invention proposes an air conditioning unit for mines and a control method thereof. One set of air conditioning unit can meet the use requirements of heading tunnels, working faces and coal mining areas.

[0010] The technical solution adopted by the present invention is to design an air-conditioning unit for a mine, wherein the mine includes: two heading tunnels, and a coal mining area formed by opening up the ends of the two heading tunnels; the air-conditioning unit includes: two mixed air systems, a refrigeration unit for supplying cooling to the mixed air systems, and a cooling tower group for cooling the refrigerant in the refrigeration unit. Each of the heading tunnels of the mine is equipped with one mixed air system, and each mixed air system is connected in parallel to the refrigeration unit.

[0011] Furthermore, the two heading tunnels are respectively a first heading tunnel and a second heading tunnel, the coal mining area is located downstream of the air outlet of the first heading tunnel, and the second heading tunnel is located downstream of the air outlet of the coal mining area;

[0012] The air mixing system in the first heading tunnel is composed of a main air mixing group and an auxiliary air mixing group connected in parallel;

[0013] The air mixing system in the second heading tunnel is composed of a main air mixing group.

[0014] Furthermore, the main air mixing group includes: at least two combination cabinets, and the combination cabinets in the main air mixing group can be switched to parallel connection or series connection; the auxiliary air mixing group includes: multiple combination cabinets, and the combination cabinets in the auxiliary air mixing group are connected in parallel.

[0015] Furthermore, the main air mixing group also includes: a ventilator that drives air through the combination cabinet, and an insulated air duct for sending the gas flowing out of the combination cabinet to the end of the tunnel. The main air mixing group in the first tunnel is located upstream of the air inlet of the auxiliary air mixing group.

[0016] Furthermore, the auxiliary air mixing group is movably installed in the first excavation tunnel.

[0017] Furthermore, the mine includes: a fresh air tunnel and an exhaust air tunnel connected to the heading tunnel, the cooling tower group is arranged in the exhaust air tunnel, the end of the first heading tunnel away from the coal mining area is close to the fresh air tunnel, and the end of the second heading tunnel away from the coal mining area is close to the exhaust air tunnel.

[0018] The present invention provides a control method for an air conditioning unit, which is applied to the above-mentioned air conditioning unit and includes:

[0019] When the two tunneling tunnels are being excavated simultaneously, the working states of the two air mixing systems are controlled according to the environmental parameters of the tunneling tunnels;

[0020] When the ends of the two heading tunnels are connected to form a coal mining area, the working state of the air mixing system in the first heading tunnel is controlled according to the environmental parameters of the coal mining area.

[0021] Furthermore, controlling the working states of the two air mixing systems according to the environmental parameters of the tunneling tunnel includes:

[0022] Detecting the working face air volume Q1, the working face relative humidity SH0, and the temperature T0 of the first heading tunnel;

[0023] If the set working face air volume is ≤ Q1 and T0 is ≤ the set tunnel temperature, then when SH0 is ≤ the set working face relative humidity SH1, the main mixed air groups of the first tunneling tunnel and the second tunneling tunnel are turned on for cooling; when SH0 is greater than the set working face relative humidity SH1, the main mixed air groups of the first tunneling tunnel and the second tunneling tunnel are turned on for dehumidification;

[0024] If the set working face air volume is greater than Q1 and T0 is greater than the set tunnel temperature, then when SH0 ≤ the set working face relative humidity SH1, the main mixed air group and the auxiliary mixed air group of the first excavation tunnel and the main mixed air group of the second excavation tunnel are turned on for cooling; when SH0 is greater than the set working face relative humidity SH1, the main mixed air groups of the first excavation tunnel and the second excavation tunnel are turned on for dehumidification, and the auxiliary mixed air group of the first excavation tunnel is turned on for cooling.

[0025] Furthermore, controlling the working states of the two air mixing systems according to the environmental parameters of the tunneling tunnel further includes:

[0026] If the set working face air volume is ≤ Q1 and T0 is greater than the set tunnel temperature, the main mixed air group and the auxiliary mixed air group of the first tunneling tunnel and the main mixed air group of the second tunneling tunnel are turned on for cooling, and the refrigeration host is controlled to provide refrigerant to the auxiliary mixed air group at the set lower limit flow rate;

[0027] If the set working face air volume is greater than Q1 and T0 is less than or equal to the set tunnel temperature, the main mixed air group and auxiliary mixed air group of the first tunneling tunnel and the main mixed air group of the second tunneling tunnel are turned on for cooling, and the auxiliary mixed air group is moved to the end of the first tunneling tunnel.

[0028] Furthermore, under the conditions that the working face air volume is set to > Q1 and T0 is set to > the tunnel temperature, after turning on the main mixed air group and the auxiliary mixed air group for cooling the first excavation tunnel, the air volume ratio p required to be processed by the auxiliary mixed air group is calculated. The larger the air volume ratio p, the greater the refrigerant flow from the refrigeration main unit to the auxiliary mixed air group.

[0029] Furthermore, the working face air volume Q1 is the air volume at the end of the first excavation tunnel, the working face relative humidity SH0 is the relative humidity at the end of the first excavation tunnel, and the temperature T0 of the first excavation tunnel is detected by multiple temperature sensors distributed in the first excavation tunnel.

[0030] Furthermore, controlling the working state of the air mixing system in the first heading tunnel according to the environmental parameters of the coal mining area includes:

[0031] Detecting the temperature T of the coal mining area;

[0032] When T≤set temperature T3, only the auxiliary mixed air group is turned on;

[0033] When the set temperature T3 is less than T, the higher the temperature T is, the more combination cabinets of the main air mixing group are opened.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] 1. Each tunneling roadway is equipped with a separate mixed air system, which is then connected in parallel to a refrigeration unit. Before the ends of two tunneling roadways are connected, the mixed air systems in each roadway regulate the environmental parameters within the roadway. After the ends of the two tunneling roadways are connected, the mixed air system in one of the roadways regulates the environmental parameters within the coal mining area and the tunneling roadway. This allows a single air conditioning unit to meet the needs of the tunneling roadway, working face, and coal mining area.

[0036] 2. Control the corresponding mixed air system according to the environmental parameters of the heading tunnel and coal mining area, effectively improving the comfort level of the mine. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The present invention is described in detail below with reference to the embodiments and accompanying drawings, in which:

[0038] Figure 1 It is a schematic diagram of the arrangement of air conditioning units in the prior art;

[0039] Figure 2 This is a schematic diagram of the arrangement of air conditioning units in the present invention without forming a coal mining area;

[0040] Figure 3 This is a schematic diagram of the air flow direction in the present invention where no coal mining area is formed;

[0041] Figure 4 It is a schematic diagram of the arrangement of air conditioning units in the coal mining area formed by the present invention;

[0042] Figure 5 It is a schematic diagram of the air flow direction in the coal mining area formed by the present invention;

[0043] Description of the accompanying drawings: 1. Fresh air tunnel; 2. Exhaust air tunnel; 3. Intermediate tunnel; 4. First heading tunnel; 5. Second heading tunnel; 6. Coal mining area; 7. Refrigeration unit; 8. Cooling tower group; 9. Main mixed air group; 10. Auxiliary mixed air group; 11. First combination cabinet; 12. Second combination cabinet; 13. Third combination cabinet; 14. Fourth combination cabinet; 15. Fifth combination cabinet; 16. Sixth combination cabinet; 17. Seventh combination cabinet; 18. First water pump; 19. Second water pump; 20. Proportional valve; 21. First control valve; 22. Second control valve; 23. Third control valve; 24. Fourth control valve; 25. Fifth control valve; 26. Ventilator; 27. Insulated air duct. DETAILED DESCRIPTION

[0044] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0045] like Figure 2 、 3 As shown, the present invention proposes an air conditioning unit for a mine. The mine comprises: a fresh air tunnel 1, an exhaust air tunnel 2, two heading tunnels, and a coal mining area 6. Each heading tunnel has a front end and a rear end, respectively. Operation proceeds gradually from the front end to the rear end. The working face of the heading tunnel is located at its rear end. The coal mining area 6 is transversely connected between the rear ends of the two heading tunnels, formed by connecting the rear ends of the two heading tunnels. The front end of each heading tunnel is connected to the fresh air tunnel 1 and the exhaust air tunnel 2. Fresh air from the external environment enters the heading tunnel through the fresh air tunnel 1, and exhaust air flowing out of the heading tunnel is discharged through the exhaust air tunnel 2.

[0046] The air-conditioning unit includes: two mixed air systems, a refrigeration unit 7 and a cooling tower group 8. Each of the mine's excavation tunnels is equipped with a mixed air system, and each mixed air system is connected to the refrigeration unit 7 in parallel. The function of the refrigeration unit 7 is to supply cooling to the mixed air system, that is, to reduce the refrigerant temperature of the mixed air system. The cooling tower group 8 is connected to the refrigeration unit 7, and its function is to cool the refrigerant of the refrigeration unit 7.

[0047] The present invention configures a mixed air system in each heading tunnel and connects each mixed air system in parallel to a refrigeration unit 7. Before the ends of the two heading tunnels are opened, the mixed air systems in each tunnel adjust the environmental parameters inside the tunnel. After the ends of the two heading tunnels are opened, the mixed air system in one of the tunnels adjusts the environmental parameters in the coal mining area 6 and the heading tunnel, so that one set of air conditioning units can meet the usage requirements of the heading tunnel, the working face and the coal mining area.

[0048] The refrigeration unit 7 includes at least one refrigeration main unit, and the cooling tower group 8 includes at least one closed cooling tower. The cooling tower group 8 is arranged in the exhaust air tunnel 2 and uses exhaust air for cooling. The closed cooling tower adopts a hydraulic fan. The hydraulic fan is a special fan. Its working principle is to use the power of water flow to drive the blades of the fan to rotate, thereby sucking in and discharging air. This type of fan is usually used in occasions that require explosion protection because it does not generate electric sparks and overheating during operation, and can effectively avoid explosion accidents caused by electrical equipment. In the closed cooling tower, the hydraulic fan is used to discharge the hot air inside and suck in the cold air outside to achieve a cooling effect. In actual applications, the number of refrigeration main units can be designed according to specific needs.

[0049] like Figure 4 、 5 As shown, in some embodiments of the present invention, the two heading tunnels are a first heading tunnel 4 and a second heading tunnel 5, the coal mining area 6 is located downstream of the air outlet of the first heading tunnel 4, and the second heading tunnel 5 is located downstream of the air outlet of the coal mining area 6. In other words, after the ends of the first heading tunnel 4 and the second heading tunnel 5 are connected, fresh air flows from the first heading tunnel 4 to the coal mining area 6, and the exhaust air flowing out of the coal mining area 6 is discharged through the second heading tunnel 4. That is, the air flow direction is fresh air tunnel 1 → enters the first heading tunnel 4 → enters the coal mining area 6 → enters the second heading tunnel 5 → enters the exhaust air tunnel 2.

[0050] The air mixing system within the first heading tunnel 4 consists of a main air mixing group 9 and an auxiliary air mixing group 10 connected in parallel. Parallel connection here means that the main and auxiliary air mixing groups 9, 10 are connected in parallel to the refrigeration unit 7. The air mixing system within the second heading tunnel 5 consists of the main air mixing group 9. The main air mixing group 9 cools and dehumidifies the heading tunnel in which it is located. The auxiliary air mixing group 10 is designed to increase the processing efficiency of the air mixing system within the first heading tunnel 4, ensuring a comfortable environment within the coal mining area 6 after the two heading tunnels are connected.

[0051] Specifically, the main mixed air group 9 includes: at least two combination cabinets. The combination cabinets in the main mixed air group 9 can be switched to parallel connection or series connection. The parallel connection is to send the refrigerant to different combination cabinets at the same time. The advantage is that the combination cabinets can share the cooling load together, and each combination cabinet can be independently controlled as needed, that is, each combination cabinet in the main mixed air group 9 can be connected to the refrigeration unit 7 or disconnected from the refrigeration unit 7. This connection method is conducive to improving the cooling efficiency. The series connection is that the low-temperature refrigerant first passes through the combination cabinet located downstream of the air inlet and then passes through the combination cabinet located upstream of the air inlet. The advantage is that the combination cabinet located upstream of the air inlet works in a high temperature and high humidity environment, absorbs some moisture and reduces the temperature, and the combination cabinet located downstream of the air inlet works at a lower temperature and further absorbs moisture. This connection method is conducive to improving the dehumidification efficiency.

[0052] The auxiliary air mixing group 10 includes: multiple combination cabinets, and the combination cabinets in the auxiliary air mixing group 10 are connected in parallel to the refrigeration unit 7. The function of the auxiliary air mixing group 10 is to gradually cool the fresh air and provide cold air to the tunnel or coal mining area.

[0053] In some embodiments of the present invention, the main air mixing group 9 further includes a ventilator 26 and a heat-insulating air duct 27. The ventilator 26 is located at the front end of the tunneling tunnel. The cabinets of the main air mixing group 9 are arranged along the length of the tunneling tunnel. Adjacent cabinets are connected by the heat-insulating air duct 27, with the ends of the heat-insulating air duct 27 located near the tunneling tunnel's working face. The ventilator 26 drives air through the cabinets, and the heat-insulating air duct 27 delivers the cool air flowing out of the cabinets to the tunneling tunnel's working face, improving worker comfort.

[0054] On this basis, the main mixed air group 9 in the first excavation tunnel 4 is located upstream of the air inlet of the auxiliary mixed air group 10. When the main mixed air group 9 and the auxiliary mixed air group 10 are both started working, the fresh air flowing into the first excavation tunnel 4 is sent to the main mixed air group 9 through the ventilator 26, and the remaining air volume that cannot pass through the ventilator 26 is cooled by the auxiliary mixed air group 10.

[0055] In some embodiments of the present invention, the auxiliary air mixing unit 10 is movably mounted within the first tunnel 4. This means that the position of the auxiliary air mixing unit 10 assembly within the first tunnel 4 is adjustable. This design allows the assembly to be moved according to the internal environment of the tunnel and coal mining area, rapidly reducing the temperature at the corresponding location and improving environmental conditioning efficiency.

[0056] To facilitate understanding, the structure of the air conditioning unit will be described in detail using an application example of the present invention. In this embodiment, the end of the first tunneling tunnel 4, located away from the coal mining area 6, is adjacent to the fresh air tunnel 1. The end of the second tunneling tunnel 5, located away from the coal mining area 6, is adjacent to the exhaust air tunnel 2. An intermediate tunnel 3 is located between the front ends of the first tunneling tunnel 4 and the second tunneling tunnel 5. Before the coal mining area 6 is formed, exhaust air from the first tunneling tunnel 4 passes through the intermediate tunnel 3 and enters the exhaust air tunnel 2, while fresh air passes through the intermediate tunnel 3 and enters the second tunneling tunnel 5.

[0057] Since the front end of the first heading tunnel 4 is closer to the fresh air tunnel 1, the fresh air enters the first heading tunnel 4 first after entering the mine. Therefore, the first heading tunnel 4 is designed upstream of the air inlet of the coal mining area 6. The main mixed air group 9 and the auxiliary mixed air group 10 are designed in the first heading tunnel 4, and only the main mixed air group 9 is designed in the second heading tunnel 5. After the coal mining area 6 is opened up, the fresh air tunnel 1, the first heading tunnel 4, the coal mining area 6, the second heading tunnel 5, and the exhaust air tunnel 2 are connected to form an underground airflow channel, which can simultaneously cool and dehumidify the tunnels and heading faces, thereby improving the comfort level of the mine.

[0058] To facilitate control of the operating status of the main air mixing group 9 and the auxiliary air mixing group 10, the refrigeration unit 7 has two cooling pipelines for outputting low-temperature refrigerant. The first cooling pipeline delivers refrigerant to the main air mixing group 9 and the auxiliary air mixing group 10 in the first tunnel 4, while the second cooling pipeline delivers refrigerant to the main air mixing group 9 in the second tunnel 5. The first cooling pipeline is equipped with a first water pump 18, and the second cooling pipeline is equipped with a second water pump 19. Each modular unit in the main air mixing group 9 is equipped with a control valve, which connects to the first cooling pipeline. A bypass pipeline is provided between adjacent modular units in the main air mixing group 9. The bypass pipeline is equipped with a control valve that switches its on and off state. The modular units in the main air mixing group 9 can be connected in series by connecting the bypass pipeline. The control valve can be an electrically operated valve such as a solenoid valve. The entire auxiliary air mixing group 10 is connected to the first cooling pipeline via a proportional valve 20. The refrigerant flow rates of different cooling pipelines can be controlled by their water pumps, and the refrigerant flow rate of the auxiliary air mixing group 10 can be controlled by the proportional valve 20.

[0059] The present invention also provides a control method for an air conditioning unit, which is applied to the above-mentioned air conditioning unit. The control method includes:

[0060] like Figure 2 As shown in the figure, when two tunneling tunnels are being excavated simultaneously, the working faces of both tunneling tunnels need to be cooled. The working states of the two mixed air systems are controlled according to the environmental parameters of the tunneling tunnels, and the mixed air systems adjust the temperature and humidity of the tunnels in which they are located.

[0061] like Figure 4As shown, when the ends of the two heading tunnels are connected to form the coal mining area 6, the first heading tunnel 4, the coal mining area 6, and the second heading tunnel 5 are connected to form an air flow channel. The operating state of the air mixing system in the first heading tunnel 4 is controlled according to the environmental parameters of the coal mining area 6. The air mixing system in the second heading tunnel 5 is shut down.

[0062] The present invention controls the corresponding mixed air systems according to the environmental parameters of the heading tunnel and the coal mining area, effectively improving the comfort level of the mine.

[0063] like Figure 2 、 3 As shown, in some embodiments of the present invention, after the ends of the first heading tunnel 4 and the second heading tunnel 5 are opened, the working face is in the coal mining area 6, and the second heading tunnel 5 is located downstream of the air outlet. Based on cost considerations, only the environmental parameters of the first heading tunnel 4 are detected. At the same time, since the two heading tunnels are advanced at almost the same height level and the environmental parameters are relatively close, the mixed air systems of the first heading tunnel 4 and the second heading tunnel 5 are synchronously controlled based on the environmental parameters of the first heading tunnel 4. The control logic is as follows:

[0064] Detecting the working face air volume Q1, the working face relative humidity SH0, and the temperature T0 of the first heading tunnel 4;

[0065] If the set working face air volume is ≤Q1 and T0 ≤ the set tunnel temperature, it means that the required cooling capacity of the working face is small and the tunneling tunnel does not need to be cooled. At this time, the control state of the main mixed air group needs to be controlled according to the humidity of the tunneling tunnel. When SH0 ≤ the set working face relative humidity SH1, it means that the humidity of the tunneling tunnel working face meets the requirements, and the main mixed air group 9 of the first tunneling tunnel 4 and the second tunneling tunnel 5 is turned on for cooling; when SH0 > the set working face relative humidity SH1, it means that the humidity of the tunneling tunnel working face is too high, and the main mixed air group 9 of the first tunneling tunnel 4 and the second tunneling tunnel 5 is turned on for dehumidification to ensure the comfort of the tunneling tunnel working face;

[0066] If the set working face air volume is greater than Q1 and T0 is greater than the set tunnel temperature, it means that the working face requires a large amount of cooling capacity and the tunneling tunnel needs to be cooled. Combined with the control state of the mixed air system controlled according to the humidity of the tunneling tunnel, when SH0 ≤ the set working face relative humidity SH1, it means that the humidity of the tunneling tunnel working face meets the requirements, and the main mixed air group 9 and the auxiliary mixed air group 10 of the first tunneling tunnel 4 and the main mixed air group 9 of the second tunneling tunnel 5 are turned on for cooling; when SH0 is greater than the set working face relative humidity SH1, it means that the humidity of the tunneling tunnel working face is too high, and the main mixed air group 9 of the first tunneling tunnel 4 and the second tunneling tunnel 5 are turned on for dehumidification, and the auxiliary mixed air group 10 of the first tunneling tunnel 4 is turned on for cooling;

[0067] If the set working face air volume ≤ Q1 and T0 > the set tunnel temperature, it means that the required cooling capacity of the working face is small and the tunneling tunnel needs to be cooled. The main mixed air group 9 and the auxiliary mixed air group 10 of the first tunneling tunnel 4 and the main mixed air group 9 of the second tunneling tunnel 5 are turned on for cooling, and the refrigeration unit 7 is controlled to supply refrigerant to the auxiliary mixed air group 10 at the set lower limit flow rate. The modular cabinets in the auxiliary mixed air group 10 are evenly arranged in the first tunneling tunnel 4. Cold air is supplied to the first tunneling tunnel 4 through the auxiliary mixed air group 10 to cool the first tunneling tunnel 4;

[0068] If the set working face air volume is greater than Q1 and T0 is less than or equal to the set tunnel temperature, it means that the working face requires a large amount of cooling capacity and the excavation tunnel does not need to be cooled. The main mixed air group 9 and the auxiliary mixed air group 10 of the first excavation tunnel 4 and the main mixed air group 9 of the second excavation tunnel 5 are turned on for cooling, and the auxiliary mixed air group 10 is moved to the end of the first excavation tunnel 4 to reduce the impact of the auxiliary mixed air group 10 on the tunnel temperature.

[0069] It should be noted that when the tunnel needs to be cooled, both the main and auxiliary air mixing groups 9, 10 of the first tunnel 4 are activated. To balance the temperatures of the two tunnels, the refrigerant flow rate provided by the refrigeration unit 7 to the main air mixing group 9 of the second tunnel 5 is increased. Furthermore, if only one of the two tunnels is operating, the air mixing system is controlled and adjusted based on the environmental parameters of the tunnel in which it is located.

[0070] In some embodiments of the present invention, when the working face requires a large amount of cooling capacity and the tunnel needs to be cooled - that is, under the conditions that the working face air volume is set to > Q1 and T0 is set to the tunnel temperature, after the main mixed air group 9 and the auxiliary mixed air group 10 of the first tunnel 4 are turned on for cooling, the air volume ratio p required to be processed by the auxiliary mixed air group 10 is calculated. The calculation method of the ratio p is p = (set working face air volume - rated processing air volume of the main mixed air group) / 100. The larger the air volume ratio p, the greater the refrigerant flow from the refrigeration unit 7 to the auxiliary mixed air group 10. The function of this design is equivalent to redistributing the refrigerant flow flowing to the main mixed air group 9 and the auxiliary mixed air group 10 according to the air volume ratio p.

[0071] It should be noted that the working face air volume Q1 is the air volume at the end of the first heading tunnel 4. The outlet velocity of the heat-insulating air duct 27 can be detected and calculated based on the wind speed and cross-sectional area of ​​the heat-insulating air duct 27. The working face relative humidity SH0 is the relative humidity at the end of the first heading tunnel 4. The temperature T0 of the first heading tunnel 4 is detected by multiple temperature sensors distributed within the first heading tunnel 4 and can be averaged.

[0072] like Figure 4 、 5 As shown, in some embodiments of the present invention, after the ends of the two heading tunnels are connected to form the coal mining area 6, the control logic of the mixed air system in the first heading tunnel 4 is as follows:

[0073] Detecting the temperature T of the coal mining area 6;

[0074] When T≤set temperature T3, only auxiliary mixed air group 10 is turned on;

[0075] When the set temperature T3 is less than T, the higher the temperature T is, the more combination cabinets of the main mixed air group 9 are opened, that is, as the temperature T of the coal mining area 6 increases, the combination cabinets of the main mixed air group 9 are gradually opened, and the combination cabinets opened in the main mixed air group 9 and the combination cabinets in the auxiliary mixed air group 10 are arranged in parallel.

[0076] For ease of understanding, the control method is described in detail by taking an application example of the present invention as an example. In this embodiment, the refrigeration unit 7 has two cooling pipelines for outputting low-temperature refrigerant. The first cooling pipeline is installed with a first water pump 18, and the second cooling pipeline is installed with a second water pump 19 and a first control valve 21. The main air mixing group 9 has two combination cabinets. The main air mixing group 9 in the first excavation tunnel 4 is a first combination cabinet 11 and a second combination cabinet 12. The first combination cabinet 11 is connected to the refrigeration unit 7 through a second control valve 22, and the second combination cabinet 12 is connected to the refrigeration unit 7 through a third control valve 23. A fifth control valve 25 is installed on the bypass pipeline between the first combination cabinet 11 and the second combination cabinet 12. The main air mixing group 9 in the second excavation tunnel 5 is The third combination cabinet 13 and the fourth combination cabinet 14, the third combination cabinet 13 is connected to the refrigeration unit 7 through the sixth control valve (not shown in the figure), the fourth combination cabinet 14 is connected to the refrigeration unit 7 through the seventh control valve (not shown in the figure), a fifth control valve 25 is installed on the bypass pipeline between the first combination cabinet 11 and the second combination cabinet 12, and a fourth control valve 24 is installed on the bypass pipeline between the third combination cabinet 13 and the fourth combination cabinet 14. The auxiliary mixed air group 10 has three combination cabinets, namely the fifth combination cabinet 15, the sixth combination cabinet 16 and the seventh combination cabinet 17. The entire auxiliary mixed air group 10 is connected to the first cooling pipeline through a proportional valve 20.

[0077] like Figure 2 、 3As shown, when two heading tunnels are excavated at the same time, if the set working face air volume ≤ Q1 and T0 ≤ the set tunnel temperature, it means that the required cooling capacity of the working face is small and the heading tunnel does not need to be cooled. When it is detected that SH0 ≤ the set working face relative humidity SH1, the first control valve 21, the second control valve 22, the third control valve 23, the sixth control valve and the seventh control valve are controlled to open, and the proportional valve 20, the fourth control valve 24 and the fifth control valve 25 are closed. Then the first water pump 18 and the second water pump 19 are turned on, and the refrigeration unit 7 is turned on to produce low-temperature cold water of T1°C, and cold air is produced through the first combination cabinet to the fourth combination cabinet. Taking the first combination cabinet and the second combination cabinet as an example, the first combination cabinet is opened. The combination cabinet 11 and the second combination cabinet 12 are arranged in parallel, and the air outlet temperature of the combination cabinet is T2℃, which is sent to the working face of the first heading tunnel 4 through the insulation air duct 27; when it is detected that SH0>the set working face relative humidity SH1, the first control valve 21, the third control valve 23, and the seventh control valve are controlled to open, the proportional valve 20, the second control valve 22, and the sixth solenoid valve are closed, the fourth control valve 24 and the fifth control valve 25 are opened, and then the first water pump 18 and the second water pump 19 are turned on, and the refrigeration unit 7 is turned on to produce low-temperature cold water of T1℃, so that the cold water flows backflow in the combination cabinet of the main mixed air group 9, fully dehumidifies the fresh air, and ensures the comfort of the working face of the heading tunnel.

[0078] If the set working face air volume > Q1 and T0 > set tunnel temperature, it means that the working face air volume Q1 of the tunneling tunnel is insufficient and the tunneling tunnel needs to be cooled. When it is detected that SH0 ≤ the set working face relative humidity SH1, the fourth control valve 24 and the fifth control valve 25 are closed, and the first control valve 21, the second control valve 22, the third control valve 23, the sixth control valve and the seventh control valve are controlled to open. The fifth combination cabinet 15 to the seventh combination cabinet 17 are driven by water, that is, the water flow increases, the larger the processed air volume, the proportional valve 20 opens 1 / N opening, and then calculates p = (set working face air volume - rated processed air volume of the first combination cabinet and the second combination cabinet) / 100. When p < 1, the proportional valve 20 is opened 1 / N, when 1 ≤ p < 2, the proportional valve is opened 2 / N, when 2 ≤ p < 3, the proportional valve 20 is opened 3 / N, and in other cases, the proportional valve 20 is opened 4 / N, N ≥4, the value of N can be designed according to specific needs, the fourth control valve 24 and the fifth control valve 25 are closed, and then the first water pump 18 and the second water pump 19 are turned on, and the refrigeration unit 7 is turned on to produce low-temperature cold water of T1°C, and cold air is produced through the first combination cabinet 11 to the seventh combination cabinet 17. Taking the first combination cabinet 11 and the second combination cabinet 12 as an example, the first combination cabinet 11 and the second combination cabinet 12 are arranged in parallel, and the outlet air temperature of the combination cabinet is T2°C, which is sent to the working face of the first excavation tunnel 4 through the insulation air duct 27. The fifth combination cabinet 15 to the seventh combination cabinet 17 use the tunnel negative pressure mixed air form to cool down the remaining air volume that cannot pass through the ventilator 26 step by step. The fifth combination cabinet 15 to the seventh combination cabinet 17 are evenly arranged in the first excavation tunnel 4, which can cool the entire tunnel. When the first excavation tunnel 4 does not need to be cooled, the fifth combination cabinet 15 to the seventh combination cabinet 17 are moved to the vicinity of the end of the first excavation tunnel 4. When it is detected that SH0>the set relative humidity of the working face SH1, the first control valve 21, the third control valve 23, and the seventh control valve are controlled to be opened, the proportional valve 20, the second control valve 22, and the sixth control valve are closed, the fourth control valve 24 and the fifth control valve 25 are opened, and then the first water pump 18 and the second water pump 19 are turned on, and the refrigeration unit 7 is turned on to produce low-temperature cold water of T1°C, so that the cold water flows countercurrently in the combination cabinet of the main mixed air group 9, fully dehumidifying the fresh air and ensuring the comfort of the working face of the excavation tunnel.

[0079] like Figure 4 、 5As shown, when the ends of the two heading tunnels are connected to form the coal mining area 6, the cooling capacity and fresh air volume required by the coal mining face increase. First, the proportional valve 20 is controlled to be fully opened, that is, the proportional valve 20 is opened to the maximum opening, and the first control valve 21 to the seventh control valve are fully closed. Then the first water pump 18 and the refrigeration unit 7 are turned on to produce low-temperature cold water of T1°C. At this time, cold air is produced through the fifth combination cabinet 15 to the seventh combination cabinet 17, and is sent to the coal mining face through step-by-step cooling of mixed air. After being heated by the coal mining face, it is discharged by the return air of the second heading tunnel 5, and then dissipated to the cooling tower group 8. When it is detected that the temperature T of the coal mining area 6 continues to be within the set temperature T3<T≤set temperature T4 for the set time, the second control valve 22 is opened and the ventilator 26 is turned on. When it is detected that the temperature T of the coal mining area 6 continues to be within the set temperature T>set temperature T4 for the set time, the second control valve 22 and the third control valve 23 are opened, and all the combination cabinets of the main mixed air group 9 and the auxiliary mixed air group 10 of the first excavation tunnel 4 are connected in parallel to supply cooling to ensure the comfort of the coal mining area 6.

[0080] It should be noted that the terms used above are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. When the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof. The order of execution of actions, steps, etc. in the devices and methods shown in the specification and the drawings can be implemented in any order as long as there is no special explicit limitation on the order and as long as the output of the previous processing is not used in the subsequent processing. Similar sequential terms used for the convenience of description do not mean that they must be implemented in such an order.

[0081] Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods, and apparatus should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0082] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An air conditioning unit for a mine, the mine comprising: Two heading tunnels, and a coal mining area formed by connecting the ends of the two heading tunnels; characterized in that the air conditioning unit includes: two mixed air systems, a refrigeration unit for supplying cooling to the mixed air systems, and a cooling tower group for cooling the refrigerant in the refrigeration unit, each of the heading tunnels of the mine is equipped with one mixed air system, and each of the mixed air systems is connected in parallel to the refrigeration unit; the two heading tunnels are respectively a first heading tunnel and a second heading tunnel, the coal mining area is located downstream of the air outlet of the first heading tunnel, and the second heading tunnel is located downstream of the air outlet of the coal mining area; The air mixing system in the first heading tunnel is composed of a main air mixing group and an auxiliary air mixing group connected in parallel; The air mixing system in the second heading tunnel is composed of a main air mixing group.

2. The air conditioning unit according to claim 1, characterized in that: The main air mixing group includes: at least two combination cabinets, and the combination cabinets in the main air mixing group can be switched to be connected in parallel or in series; the auxiliary air mixing group includes: multiple combination cabinets, and the combination cabinets in the auxiliary air mixing group are connected in parallel.

3. The air conditioning unit according to claim 2, characterized in that: The main air mixing group also includes: a ventilator that drives air through the combination cabinet, and an insulated air duct for sending the gas flowing out of the combination cabinet to the end of the excavation tunnel. The main air mixing group in the first excavation tunnel is located upstream of the air inlet of the auxiliary air mixing group.

4. The air conditioning unit according to claim 2, characterized in that: The auxiliary air mixing group is movably installed in the first excavation tunnel.

5. The air conditioning unit according to claim 1, characterized in that: The mine includes: a fresh air tunnel and a ventilation tunnel connected to the heading tunnel, the cooling tower is assembled in the ventilation tunnel, the end of the first heading tunnel away from the coal mining area is close to the fresh air tunnel, and the end of the second heading tunnel away from the coal mining area is close to the ventilation tunnel.

6. A control method for an air-conditioning unit, the control method being applied to the air-conditioning unit according to any one of claims 1 to 5; characterized in that: The control method includes: When the two tunneling tunnels are being excavated simultaneously, the working states of the two air mixing systems are controlled according to the environmental parameters of the tunneling tunnels; When the ends of the two heading tunnels are connected to form a coal mining area, the working state of the air mixing system in the first heading tunnel is controlled according to the environmental parameters of the coal mining area.

7. The control method according to claim 6, characterized in that: Controlling the working states of the two air mixing systems according to the environmental parameters of the tunneling tunnel includes: Detecting the working face air volume Q1, the working face relative humidity SH0, and the temperature T0 of the first heading tunnel; If the set working face air volume is ≤ Q1 and T0 is ≤ the set tunnel temperature, then when SH0 is ≤ the set working face relative humidity SH1, the main mixed air groups of the first tunneling tunnel and the second tunneling tunnel are turned on for cooling; when SH0 is greater than the set working face relative humidity SH1, the main mixed air groups of the first tunneling tunnel and the second tunneling tunnel are turned on for dehumidification; If the set working face air volume is greater than Q1 and T0 is greater than the set tunnel temperature, then when SH0 ≤ the set working face relative humidity SH1, the main mixed air group and the auxiliary mixed air group of the first excavation tunnel and the main mixed air group of the second excavation tunnel are turned on for cooling; when SH0 is greater than the set working face relative humidity SH1, the main mixed air groups of the first excavation tunnel and the second excavation tunnel are turned on for dehumidification, and the auxiliary mixed air group of the first excavation tunnel is turned on for cooling.

8. The control method according to claim 7, characterized in that: Controlling the working states of the two air mixing systems according to the environmental parameters of the tunneling tunnel further includes: If the set working face air volume is ≤ Q1 and T0 is greater than the set tunnel temperature, the main mixed air group and the auxiliary mixed air group of the first tunneling tunnel and the main mixed air group of the second tunneling tunnel are turned on for cooling, and the refrigeration unit is controlled to provide refrigerant to the auxiliary mixed air group at the set lower limit flow rate; If the set working face air volume is greater than Q1 and T0 is less than or equal to the set tunnel temperature, the main mixed air group and auxiliary mixed air group of the first tunneling tunnel and the main mixed air group of the second tunneling tunnel are turned on for cooling, and the auxiliary mixed air group is moved to the end of the first tunneling tunnel.

9. The control method according to claim 7, characterized in that: Under the conditions that the working face air volume is set to > Q1 and T0 is set to > the tunnel temperature, after turning on the main mixed air group and the auxiliary mixed air group for cooling the first excavation tunnel, the air volume ratio p required to be processed by the auxiliary mixed air group is calculated. The larger the air volume ratio p, the greater the refrigerant flow provided by the refrigeration group to the auxiliary mixed air group.

10. The control method according to claim 7, characterized in that: The working face air volume Q1 is the air volume at the end of the first excavation tunnel, the working face relative humidity SH0 is the relative humidity at the end of the first excavation tunnel, and the temperature T0 of the first excavation tunnel is detected by multiple temperature sensors distributed in the first excavation tunnel.

11. The control method according to claim 6, characterized in that: Controlling the working state of the air mixing system in the first heading tunnel according to the environmental parameters of the coal mining area includes: Detecting the temperature T of the coal mining area; When T≤set temperature T3, only the auxiliary mixed air group is turned on; When the set temperature T3 is less than T, the higher the temperature T is, the more combination cabinets of the main air mixing group are opened.

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