Air conditioning system

Abstract

The utility model provides an air conditioning system which comprises a plurality of refrigeration main machines and end devices arranged on working faces respectively, the cold supply sides of the refrigeration main machines are sequentially connected in series through a main water supply pipe, and branch water supply pipes of the working faces are connected to the water supply end of the tail end of the main water supply pipe in parallel. Bypass branches directly connected with the branch water supply pipes are further connected to the main water supply pipeline between every two adjacent refrigeration main machines, so that a plurality of water supply ends with different water supply temperatures are formed on the main water supply pipeline; the bypass branch is provided with a valve assembly and a water pump and used for switching the water supply ends connected with the branch water supply pipes. By optimizing the chilled water supply scheme, the cold supply requirements of different loads and different areas can be met at the same time, the energy consumption of the whole system is reduced, and the comfort of the system is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of mine air conditioners, and specifically relates to an air conditioning system. Background Technique

[0002] At present, there are many mine cooling equipment and technologies, including ground centralized refrigeration equipment, underground centralized refrigeration equipment and local refrigeration equipment. Among them, underground centralized refrigeration equipment has the advantages of large cooling capacity, high energy efficiency, good cooling and dehumidification effects, and can supply cooling to multiple working faces, chambers and operation posts at the same time. More and more coal mines are starting to build underground centralized refrigeration air conditioning systems. However, at present, the calculation of the underground cooling load is not accurate. A plurality of underground working faces are directly connected in parallel to the water supply end of the multi-stage series refrigeration host, and the actual cooling requirements of each working face are different. It is impossible to adjust the water supply end according to the actual temperature of the working face, resulting in increased energy consumption. Content of the Utility Model

[0003] In order to solve the technical problem that the water supply end temperature cannot be adjusted according to the actual temperature of the working face in the above-mentioned prior art, the utility model provides an air conditioning system.

[0004] The technical solution adopted by the utility model is as follows:

[0005] The utility model provides an air conditioning system, including: a plurality of refrigeration hosts, end devices respectively arranged at each working face, the cooling sides of the plurality of refrigeration hosts are sequentially connected in series through a main water supply pipe, and the branch water supply pipes of the end devices of each working face are connected in parallel to the water supply end at the end of the main water supply pipe. It is characterized in that a plurality of the branch water supply pipes are respectively connected to the main water supply pipe between adjacent two refrigeration hosts through bypass branches, so that the branch water supply pipes connected with the bypass branches can be connected to different temperature segments of the main water supply pipe; a valve assembly is further arranged on the bypass branch for switching the temperature segment of the main water supply pipe connected by the branch water supply pipe.

[0006] Each bypass branch includes: a bypass sub-branch respectively connected between adjacent two of the plurality of refrigeration hosts, and a bypass main branch connecting the ends of all the bypass sub-branches and the branch water supply pipe.

[0007] Furthermore, a plurality of water pumps are connected in parallel to the end of the main water supply pipeline, and water pumps are also arranged on the branch water supply pipes connected with the bypass branches.

[0008] Furthermore, a water pump is arranged on the bypass branch, which is used to increase the flow rate of its corresponding working face when it is opened.

[0009] Furthermore, the valve assembly includes: a valve arranged on the bypass sub-branch.

[0010] Further, the refrigeration main unit includes a first-stage refrigeration main unit, a second-stage refrigeration main unit, and a third-stage refrigeration main unit connected in series in sequence through a main water supply pipe; the working face includes a coal mining face, a tunneling face, and a chamber, wherein the branch water supply pipes provided in the tunneling face and the chamber are respectively connected with a tunneling face bypass branch and a chamber bypass branch.

[0011] Further, the valve assembly includes: a first valve provided on the bypass branch of the tunneling face and used to connect to the bypass sub-branch between the first-stage refrigeration main unit and the second-stage refrigeration main unit, and a third valve used to connect to the bypass sub-branch between the second-stage refrigeration main unit and the third-stage refrigeration main unit; a second valve provided on the bypass branch of the chamber and used to connect to the bypass sub-branch between the first-stage refrigeration main unit and the second-stage refrigeration main unit, and a fourth valve used to connect to the bypass sub-branch between the second-stage refrigeration main unit and the third-stage refrigeration main unit.

[0012] Further, a third water pump, a fourth water pump, and a fifth water pump are connected in parallel at a position near the end of the main water supply pipe. A first water pump is provided on the bypass branch of the tunneling face, a sixth water pump is provided on the bypass branch of the chamber, a second water pump is provided on the branch water supply pipe of the tunneling face, and a seventh water pump is provided on the branch water supply pipe of the chamber.

[0013] When it is detected that the temperature t5 of the coal mining face and the temperature t6 of the tunneling face are both greater than or equal to the preset temperature T2, and the temperature t4 of the chamber is less than the preset temperature T1, only the second valve is opened, and only the second water pump, the fourth water pump, and the sixth water pump are turned on;

[0014] When it is detected that the temperature t5 of the coal mining face and the temperature t6 of the tunneling face are both greater than or equal to the preset temperature T2, the temperature t4 of the chamber is less than or equal to the preset temperature T2, and greater than or equal to the preset temperature T1, only the fourth valve is opened, and only the second water pump, the fourth water pump, and the sixth water pump are turned on.

[0015] When it is detected that the temperature t5 of the coal mining face and the temperature t4 of the chamber are both greater than or equal to the preset temperature T2, and the temperature t6 of the tunneling face is less than the preset temperature T1, only the first valve is opened, and only the first water pump, the fourth water pump, and the seventh water pump are turned on;

[0016] When it is detected that the temperature t5 of the coal mining face and the temperature t4 of the chamber are both greater than or equal to the preset temperature T2, the temperature t6 of the tunneling face is less than or equal to the preset temperature T2, and greater than or equal to the preset temperature T1, only the third valve is opened, and only the first water pump, the fourth water pump, and the seventh water pump are turned on;

[0017] When it is detected that the temperature t4 of the chamber and the temperature t6 of the tunneling face are both greater than or equal to the preset temperature T2, and the temperature t5 of the coal mining face is less than the preset temperature T2, the valves of all bypass branches are closed, and only the second water pump, the fourth water pump, and the seventh water pump are turned on.

[0018] When it is detected that the temperature t5 of the coal mining face and the temperature t6 of the tunneling face are both greater than or equal to the preset temperature T1 and less than or equal to the preset temperature T2, and the temperature t4 of the chamber is greater than the preset temperature T2, turn off the three-stage refrigeration main unit, only open the fourth valve, and only turn on the second water pump, the fourth water pump, the sixth water pump and the seventh water pump;

[0019] When it is detected that the temperature t4 of the chamber and the temperature t6 of the tunneling face are both greater than or equal to the preset temperature T1 and less than or equal to the preset temperature T2, and the temperature t5 of the coal mining face is greater than the preset temperature T2, only open the third valve and the fourth valve, and only turn on the first water pump, the fourth water pump and the sixth water pump;

[0020] When it is detected that the temperature t5 of the coal mining face and the temperature t4 of the chamber are both greater than or equal to the preset temperature T1 and less than or equal to the preset temperature T2, and the temperature t6 of the tunneling face is greater than the preset temperature T2, turn off the three-stage refrigeration main unit, and only open the third valve, and only turn on the first water pump, the second water pump, the fourth water pump and the seventh water pump.

[0021] When it is detected that the temperature t5 of the coal mining face and the temperature t6 of the tunneling face are both less than or equal to the preset temperature T1, and the temperature t4 of the chamber is greater than the preset temperature T1, turn on the first-stage refrigeration main unit and the second-stage refrigeration main unit, and increase the target outlet water temperature of the first-stage refrigeration main unit and the second-stage refrigeration main unit, only open the fourth valve, and only turn on the second water pump, the fourth water pump, the sixth water pump and the seventh water pump;

[0022] When it is detected that the temperature t4 of the chamber and the temperature t6 of the tunneling face are both less than or equal to the preset temperature T1, and the temperature t5 of the coal mining face is greater than the preset temperature T1, turn on the first-stage refrigeration main unit and the second-stage refrigeration main unit, only open the first valve and the second valve, and only turn on the first water pump, the fourth water pump and the sixth water pump;

[0023] When it is detected that the temperature t5 of the coal mining face and the temperature t4 of the chamber are both less than or equal to the preset temperature T1, and the temperature t6 of the tunneling face is greater than the preset temperature T1, turn on the first-stage refrigeration main unit and the second-stage refrigeration main unit, only open the second valve and the third valve, and only turn on the first water pump, the second water pump, the fourth water pump and the sixth water pump.

[0024] The utility model further includes: a cooling tower, and the cooling tower exchanges heat with the cooling side of the multiple refrigeration main units through a cooling circulation pipeline.

[0025] Compared with the prior art, by respectively providing bypass branches corresponding to multiple sub-water supply pipes, and the branches of each bypass branch are simultaneously connected to different water supply nodes of the main water supply pipe, when the working face of the sub-water supply pipe needs to supply different chilled water temperatures, the valve on the bypass branch can be directly adjusted, so that the required cooling capacity of the working face is more matched with the actually supplied cooling capacity. Description of the Drawings

[0026] To more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0027] Figure 1 System diagram of a specific embodiment of the present utility model;

[0028] Figure 2 System diagram of the refrigeration main unit part in a specific embodiment of the present utility model;

[0029] Figure 3 System diagram of the bypass branch in a specific embodiment of the present utility model;

[0030] 1. Cooling tower; 2. Primary refrigeration main unit; 3. Secondary refrigeration main unit; 4. Tertiary refrigeration main unit; 5. Combined cabinet for heading face; 6. Combined cabinet for coal face; 7. Hydraulic air disc; 8. Cooling water pump; 9. First water pump; 10. Third water pump; 11. Fourth water pump; 12. Fifth water pump; 13. Sixth water pump; 14. Seventh water pump; 15. Second water pump; 16. Ventilator; 17. First valve; 18. Second valve; 19. Third valve; 20. Fourth valve; 21. Main bypass branch; 22. Sub-bypass branch. Specific embodiments

[0031] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present utility model clearer, the following further details the present utility model in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0032] The following details the principle and structure of the present utility model in combination with the drawings and embodiments.

[0033] Currently, there are many mine cooling equipment and technologies, including ground centralized refrigeration equipment, underground centralized refrigeration equipment and local refrigeration equipment. Among them, underground centralized refrigeration equipment has a large cooling capacity, high energy efficiency, good cooling and dehumidification effects, and can supply cold to multiple working faces, chambers and operation posts at the same time. More and more coal mines are starting to build underground centralized refrigeration air-conditioning systems. However, at present, the calculation of the underground cooling load is not accurate. Multiple underground working faces are directly connected in parallel to the water supply end of the multi-stage series refrigeration main unit. At the same time, due to explosion-proof requirements, fixed-frequency water pumps are generally used. The actual cooling requirements of each working face are different, and it is impossible to adjust the water supply end according to the actual temperature of the working face, resulting in increased energy consumption.

[0034] In response to this, the present utility model proposes an air conditioning system, specifically a mine air conditioner, which includes multiple refrigeration main units and combination cabinets arranged at each working face. The return water end of the refrigeration side of the first-ranked refrigeration main unit is connected to the main return water pipe, and the refrigeration sides of each refrigeration main unit are connected in series in sequence through the main water supply pipe. That is, the water supply end of the refrigeration side of the first-ranked refrigeration main unit is connected to the return water end of the refrigeration side of the second-ranked refrigeration main unit through the main return water pipe, and then the water supply end of the refrigeration side of the second-ranked refrigeration main unit is connected to the return water end of the refrigeration side of the third-ranked refrigeration main unit through the main return water pipe, and so on until the nth refrigeration main unit; the end of the main water supply end (i.e., the end after connecting the last refrigeration main unit) is connected in parallel with multiple sub-water supply pipes. The number of sub-water supply pipes corresponds to the number of working faces, that is, each working face has a sub-water supply pipe, and the combination cabinets or end devices of the working faces are connected in parallel or in series on the sub-water supply pipes; the water inlet ends of multiple sub-water supply pipes are also connected with a bypass branch. The water inlet end of the bypass branch branches, and each branch is respectively connected to the main water supply pipe between two adjacent refrigeration main units. That is, some sub-water supply pipes can be directly connected to different temperature sections of the main water supply pipe through the bypass branch (that is, the main water supply pipe is divided into multiple sections by the refrigeration main units, and the temperature of each section is different, which is a temperature section). At the same time, valves are provided on the bypass branch corresponding to each temperature section, so that when different water supply temperatures are required at the working face, the valves at the corresponding water supply nodes can be directly opened, so that the working face can supply water at different temperatures.

[0035] That is, the present utility model sets bypass branches corresponding to multiple sub-water supply pipes, and the branches of each bypass branch are simultaneously connected to different water supply nodes of the main water supply pipe. Thus, when different chilled water temperatures need to be supplied to the working faces of the sub-water supply pipes, the valves on the bypass branches can be directly adjusted to make the required cooling capacity of the working face more matched with the actually supplied cooling capacity.

[0036] In a specific embodiment, as Figure 1 shown, the air conditioning system further includes: a cooling tower 1. Multiple cooling towers exchange heat in a circulating manner with the cooling sides of multiple refrigeration main units through a cooling circulation pipeline. A cooling water pump 8 is provided on the circulation pipeline to enable the refrigeration main units to perform normal refrigeration and heat exchange. The cooling tower is located on the ground, which is specifically the cooling mode of a conventional mine air conditioner and will not be elaborated in detail.

[0037] As Figure 3 shown, in a specific embodiment, each bypass branch specifically includes: a bypass sub-branch 22 respectively connected between two adjacent refrigeration main units among multiple refrigeration main units, and a bypass main branch 21 connecting the ends of all bypass sub-branches and the sub-water supply pipe.

[0038] When multiple refrigeration hosts are connected in series, the temperature drops step by step. By separately switching and opening the valves on one of the bypass branches, the water supply pipe of the sub-distribution can be directly connected to the water supply ends of different refrigeration hosts, changing the chilled water temperature of the sub-distribution water pipe to match the actual situation of the working face.

[0039] In a specific embodiment, multiple water pumps are arranged in parallel at the end of the main water supply pipe, and a water pump is provided on the bypass branch water supply pipe.

[0040] The multiple parallel water pumps arranged at the end of the main water supply pipe are used to adjust the water flow rate at the water supply end, and the water pump arranged on the sub-distribution water pipe is used to increase the flow rate of the sub-distribution water pipe when the sub-distribution water pipe is connected to the bypass branch.

[0041] In a specific embodiment, a water pump is provided on the bypass branch. When some refrigeration hosts are turned off, or when the flow rate of the working face needs to be increased, the water pump on the bypass branch is turned on to increase the flow rate of its corresponding working face.

[0042] The valve assembly specifically includes: valves provided on each bypass branch. That is, each bypass branch can be opened separately or simultaneously to mix the water temperatures of the upper and lower levels, making the controllable range of the water temperature wider.

[0043] It should be noted that the water pumps in the present invention are fixed-frequency water pumps, and the water supply is mainly adjusted by switches.

[0044] In a specific embodiment, the number of multiple refrigeration hosts is n, that is, there are n water supply nodes, and the water supply temperatures corresponding to each water supply node are different. The water supply node at the outermost end is the original water supply node of the main water supply pipe; the working faces of each sub-distribution water pipe with a bypass branch can be set with n corresponding temperature ranges, which are adapted to the temperatures of the water supply nodes. That is, when the temperature of the working face corresponding to the sub-distribution water pipe is within an arbitrary temperature range, the corresponding bypass branch is also switched to the water supply node in the temperature range for connection.

[0045] Such as Figure 1 、 2 As shown in the figure, in a specific embodiment, the refrigeration hosts include a first-stage refrigeration host 2, a second-stage refrigeration host 3, and a third-stage refrigeration host 4 connected in series in sequence through the main water supply pipe; the working faces include a coal mining face, a tunneling face, and a chamber. Among them, the sub-distribution water pipes arranged at the tunneling face and the chamber are respectively connected with a tunneling face bypass branch and a chamber bypass branch. The sub-distribution water pipe of the coal mining face is an extension of the main water supply pipe and obtains the most flow rate.

[0046] Because the coal mining face requires the most cooling capacity, and the pipeline is actually an extended section of the main water supply pipe, a bypass branch is not directly provided. However, the flow rate can also be adjusted by multiple parallel water pumps arranged on the main water supply pipe to control the supply of its cooling capacity.

[0047] Specifically, the end equipment of the driving face is the combined cabinet 5 of the driving face and the ventilator 16. The coal mining face is the combined cabinet 6 of the coal mining face connected in parallel to the sub-feed water pipe. The chamber is the hydraulic air disc 7 connected in parallel to the sub-feed water pipe.

[0048] Specifically, the valve assembly includes: the first valve 17, the second valve 18, the third valve 19 and the fourth valve 20;

[0049] The first valve 17 is arranged on the bypass branch of the driving face and is used to connect to the bypass sub-branch 22 between the primary refrigeration host 2 and the secondary refrigeration host 3. The third valve 19 is arranged on the bypass branch of the driving face and is used to connect to the bypass sub-branch 22 between the secondary refrigeration host 3 and the tertiary refrigeration host 4;

[0050] The second valve 18 is arranged on the bypass branch of the chamber and is used to connect to the bypass sub-branch 22 between the primary refrigeration host 2 and the secondary refrigeration host 3. The fourth valve 20 is used to connect to the bypass sub-branch 22 between the secondary refrigeration host 3 and the tertiary refrigeration host 4.

[0051] That is, valves are correspondingly arranged on the bypass sub-branches of each bypass branch, so that each bypass branch can be opened separately or simultaneously to mix the water temperatures of the upper and lower levels, making the controllable range of the water temperature wider.

[0052] In a specific embodiment, a third water pump 10, a fourth water pump 11 and a fifth water pump 12 are connected in parallel at a position near the end of the main water supply pipe. A first water pump 9 is arranged on the bypass branch of the driving face, a sixth water pump 13 is arranged on the bypass branch of the chamber, a second water pump 15 is arranged on the sub-feed water pipe of the driving face, and a seventh water pump 14 is arranged on the sub-feed water pipe of the chamber.

[0053] The water pumps connected in parallel at a position near the end of the main water supply pipe can fully supply the chilled water to the sub-feed water pipes of each working face when the bypass branch is not opened. At the same time, water pumps are arranged on the sub-feed water pipes with bypass branches to increase the flow rate of the sub-feed water pipe when the bypass branch is connected, ensuring that the bypass branch can supply chilled water normally.

[0054] The following are the specific water pump opening and valve opening conditions of each working face in the above embodiment. Temperature acquisition is carried out on each working face. Specifically, the chamber temperature is t4, the coal mining face temperature is t5, and the driving face temperature is t6. At the same time, the target outlet water temperature is set correspondingly according to the three refrigeration hosts in sequence. The outlet water temperature of the first refrigeration host is the first-stage cooling, and the target outlet water temperature is t1;

[0055] The second refrigeration host is the second-stage cooling, and the target outlet water temperature is t2;

[0056] The third refrigeration host is the third-stage cooling, and the target outlet water temperature is t3;

[0057] Meanwhile, a preset temperature T2 and a preset temperature T3 are set corresponding to the working face. By default, T1 < T2, the value range of T1 is 20 - 25 °C, and the value range of T2 is 28 - 36 °C.

[0058] When it is detected that the temperature t5 of the coal mining face and the temperature t6 of the tunneling face are both greater than or equal to the preset temperature T2, and the temperature t4 of the chamber is less than the preset temperature T1, only the second valve 18 is opened, and only the second water pump 15, the fourth water pump 11, and the sixth water pump 13 are turned on;

[0059] When it is detected that the temperature t5 of the coal mining face and the temperature t6 of the tunneling face are both greater than or equal to the preset temperature T2, the temperature t4 of the chamber is less than or equal to the preset temperature T2 and greater than or equal to the preset temperature T1, only the fourth valve 20 is opened, and only the second water pump 15, the fourth water pump 11, and the sixth water pump 13 are turned on.

[0060] That is, if the temperatures of the coal mining face t5 and the tunneling face t6 are above T2, it means that chilled water needs to be supplied normally and water is supplied according to the original working conditions. However, the cooling demand of the chamber is small, and at the same time, the temperature is detected to be less than T2. The valve to be opened can be selected according to the specific temperature range to make the cooling capacity supplied to the chamber match the actual working conditions.

[0061] When it is detected that the temperature t5 of the coal mining face and the temperature t4 of the chamber are both greater than or equal to the preset temperature T2, and the temperature t6 of the tunneling face is less than the preset temperature T1, only the first valve 17 is opened, and only the first water pump 9, the fourth water pump 11, and the seventh water pump 14 are turned on;

[0062] When it is detected that the temperature t5 of the coal mining face and the temperature t4 of the chamber are both greater than or equal to the preset temperature T2, the temperature t6 of the tunneling face is less than or equal to the preset temperature T2 and greater than or equal to the preset temperature T1, only the third valve 19 is opened, and only the first water pump 9, the fourth water pump 11, and the seventh water pump 14 are turned on;

[0063] That is, when it is detected that the temperature of the tunneling face is less than T2, the valve to be opened can be selected according to the specific temperature range to make the cooling capacity supplied to the tunneling face match the actual working conditions.

[0064] In addition, when it is detected that the temperature t4 of the chamber and the temperature t6 of the tunneling face are both greater than or equal to the preset temperature T2, while the temperature t5 of the coal mining face is less than the preset temperature T2, all the valves of the bypass branches are closed, and only the second water pump 15, the fourth water pump 11, and the seventh water pump 14 are turned on.

[0065] Since the coal mining face requires a large amount of cooling capacity, and at this time both the chamber and the tunneling face are outside the preset temperature T2, the bypass branch can be not opened, and the water pumps of the split water supply pipe can be directly opened. That is, the actual flow rate obtained by the coal mining face is reduced, while the flow rates obtained by the chamber and the tunneling face are increased to balance the load.

[0066] When it is detected that the temperature t5 of the coal mining face and the temperature t6 of the tunneling face are both greater than or equal to the preset temperature T1 and less than or equal to the preset temperature T2, and the temperature t4 of the chamber is greater than the preset temperature T2, turn off the three-stage refrigeration main unit 4, and only open the fourth valve 20, and only turn on the second water pump 15, the fourth water pump 11, the sixth water pump 13 and the seventh water pump 14;

[0067] When it is detected that the temperature t5 of the coal mining face and the temperature t4 of the chamber are both greater than or equal to the preset temperature T1 and less than or equal to the preset temperature T2, and the temperature t6 of the tunneling face is greater than the preset temperature T2, turn off the three-stage refrigeration main unit 4, and only open the third valve 19, and only turn on the first water pump 9, the second water pump 15, the fourth water pump 11 and the seventh water pump 14.

[0068] That is, when the temperature of the coal mining face is between T1 and T2, it indicates that the cold supply of the coal mining face is sufficient, and the cold supply can be appropriately reduced, that is, turn off the three-stage refrigeration main unit 4. When the temperature of other working faces is too high, the cold supply can be increased directly by increasing the flow rate.

[0069] When it is detected that the temperature t4 of the chamber and the temperature t6 of the tunneling face are both greater than or equal to the preset temperature T1 and less than or equal to the preset temperature T2, and the temperature t5 of the coal mining face is greater than the preset temperature T2, only open the third valve 19 and the fourth valve 20, and only turn on the first water pump 9, the fourth water pump 11 and the sixth water pump 13;

[0070] That is, when the temperature of the coal mining face is too high and the temperatures of the other two working faces are within the range, the bypass branches of the other two working faces can be opened so that the cold can be fully supplied to the coal mining face.

[0071] When it is detected that the temperature t5 of the coal mining face and the temperature t6 of the tunneling face are both less than or equal to the preset temperature T1, and the temperature t4 of the chamber is greater than the preset temperature T1, turn on the first-stage refrigeration main unit 2 and the second-stage refrigeration main unit 3 (or turn off the three-stage refrigeration main unit 4), and increase the target outlet water temperatures of the first-stage refrigeration main unit 2 and the second-stage refrigeration main unit 3, specifically t1 + n and t2 + n (n can be set as needed), and only open the fourth valve 20, and only turn on the second water pump 15, the fourth water pump 11, the sixth water pump 13 and the seventh water pump 14;

[0072] When it is detected that the temperature t4 of the chamber and the temperature t6 of the tunneling face are both less than or equal to the preset temperature T1, and the temperature t5 of the coal mining face is greater than the preset temperature T1, turn on the first-stage refrigeration main unit 2 and the second-stage refrigeration main unit 3, only open the first valve 17 and the second valve 18, and only turn on the first water pump 9, the fourth water pump 11 and the sixth water pump 13;

[0073] When it is detected that the temperature t5 of the coal mining face and the temperature t4 of the chamber are both less than or equal to the preset temperature T1, and the temperature t6 of the tunneling face is greater than the preset temperature T1, turn on the primary refrigeration host 2 and the secondary refrigeration host 3, only open the second valve 18 and the third valve 19, and only turn on the first water pump 9, the second water pump 15, the fourth water pump 11 and the sixth water pump 13.

[0074] In the case where both working faces are less than T1, the tertiary refrigeration host 4 can be directly turned off, or the target outlet water temperature can be adjusted upward to reduce the load. At the same time, the valves on the bypass branch are correspondingly opened to divert the flow and improve the temperature adaptation of each working face.

[0075] In addition, the unified temperature change of the three working faces is controlled as follows:

[0076] When it is detected that (chamber t4, coal mining face t5, tunneling face t6) ≥ T2, close the first valve 17, the second valve 18, the third valve 19 and the fourth valve 20, open the third water pump 10, the fourth water pump 11 and the fifth water pump 12, and close the other water pumps. The refrigeration unit supplies low-temperature chilled water t3, which is sent to the ends of each working face through the constant-frequency water pump.

[0077] When it is detected that T1 ≤ (chamber t4, coal mining face t5, tunneling face t6) ≤ T2, close the first valve 17, the second valve 18, the third valve 19 and the fourth valve 20, open the third water pump 10, the fourth water pump 11 and the fifth water pump 12, and close the other water pumps. At the same time, turn off the tertiary refrigeration host 4, so that the chiller supplies low-temperature chilled water t2, which is sent to the ends of each working face through the constant-frequency water pump.

[0078] When it is detected that (chamber t4, coal mining face t5, tunneling face t6) ≤ T1, the three refrigeration hosts change the refrigeration target outlet water temperature. The target water temperature of the primary refrigeration host 2 is t1 + n, the target water temperature of the secondary refrigeration host 3 is t2 + n, and the target water temperature of the tertiary refrigeration host 4 is t3 + n. Open the third water pump 10, the fourth water pump 11 and the fifth water pump 12. While making full use of the energy level gradient, increase the target outlet water temperature of the entire system and reduce the heat exchange at the end.

[0079] 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. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that 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.

[0080] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present utility model. At the same time, it should be understood that for the convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0081] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by orientation terms such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal", and "top, bottom", etc., are usually based on the orientation or positional relationships shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description. Without contrary statements, these orientation terms do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the protection scope of the present utility model; the orientation terms "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0082] For the convenience of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "above-mentioned", etc., can be used here to describe the spatial positional relationships between a device or feature shown in the drawings and other devices or features. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation described in the drawings for the device. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned as "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations should be made for the spatial relative descriptions used here.

[0083] In addition, it should be noted that the use of words such as "first", "second", etc. to limit components is only for the convenience of differentiating the corresponding components. Without additional statements, the above words have no special meanings. Therefore, it cannot be understood as a limitation on the protection scope of the present utility model.

[0084] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, the present utility model can have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An air conditioning system, comprising: A plurality of refrigeration main machines are respectively arranged at the terminal equipment of each working surface. The cooling sides of the plurality of refrigeration main machines are connected in series in sequence through a main water supply pipe. The branch water supply pipes of the terminal equipment of each working surface are connected in parallel to the water supply end at the end of the main water supply pipe. It is characterized in that the plurality of branch water supply pipes are respectively connected to the main water supply pipe between two adjacent refrigeration main machines through bypass branches, so that the branch water supply pipes connected to the bypass branch can be connected to different temperature sections of the main water supply pipe; a valve assembly is also provided on the bypass branch for switching the temperature section of the main water supply pipe to which the branch water supply pipe is connected.

2. The air conditioning system according to claim 1, characterized in that: Each of the bypass branches comprises: a bypass sub-branch respectively connected between two adjacent refrigeration main machines among the multiple refrigeration main machines, and a bypass main branch connecting the ends of all the bypass sub-branches and the branch water supply pipe.

3. The air conditioning system according to claim 1, characterized in that: A plurality of water pumps are connected in parallel to the end of the main water supply pipeline, and a water pump is also arranged on the branch water supply pipe connected to the bypass branch.

4. The air conditioning system according to claim 3, characterized in that: The bypass branch is provided with a water pump, which is used to increase the flow rate of the corresponding working surface when it is turned on.

5. The air conditioning system according to claim 2, characterized in that: The valve assembly includes: a valve correspondingly arranged on each of the bypass secondary branches.

6. The air conditioning system according to any one of claims 1 to 5, characterized in that: The refrigeration main unit includes a first-level refrigeration main unit, a second-level refrigeration main unit and a third-level refrigeration main unit which are connected in series in sequence through a main water supply pipe; the working face includes a coal mining face, an excavation face and a chamber, wherein the branch water supply pipes arranged on the excavation face and the chamber are respectively connected to a bypass branch of the excavation face and a bypass branch of the chamber.

7. The air conditioning system according to claim 6, characterized in that: The valve assembly includes: a first valve arranged on the bypass branch of the excavation face for connecting to the bypass sub-branch between the primary refrigeration main unit and the secondary refrigeration main unit, and a third valve arranged on the bypass sub-branch for connecting between the secondary refrigeration main unit and the tertiary refrigeration main unit; a second valve arranged on the bypass branch of the chamber for connecting to the bypass sub-branch between the primary refrigeration main unit and the secondary refrigeration main unit, and a fourth valve arranged on the bypass sub-branch for connecting between the secondary refrigeration main unit and the tertiary refrigeration main unit.

8. The air conditioning system according to claim 7, characterized in that: A third water pump, a fourth water pump and a fifth water pump are connected in parallel near the end of the main water supply pipeline, a first water pump is provided on the bypass branch of the excavation face, a sixth water pump is provided on the bypass branch of the chamber, a second water pump is provided on the branch water supply pipe of the excavation face, and a seventh water pump is provided on the branch water supply pipe of the chamber.

9. The air conditioning system according to claim 1, characterized in that: Also includes: A cooling tower circulates heat with the cooling sides of the multiple refrigeration hosts through a cooling circulation pipeline.

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