A cooling water system shared by a shield tunneling machine and an air conditioning device and a control method thereof

Abstract

The application discloses a cooling water system shared by a shield tunneling machine and an air conditioning device and a control method thereof. The cooling water system is characterized in that a pipe system of a switchable water flow loop is constructed between a cooling water source, the shield tunneling machine and the air conditioning device, the cooling water supply temperature, the shield tunneling machine oil temperature and the cooling water return temperature are monitored respectively, each electric valve is automatically controlled to be opened or closed according to the temperature monitoring result, the cooling water flow loop is switched, the cooling water system is automatically switched between a return water series connection mode, a parallel connection mode or an internal circulation mode, the cooling water system is automatically switched to a suitable operation mode in different stages of shield tunneling, the shield tunneling machine and the air conditioning device can share the cooling water system, and the two can be synchronously, stably and reliably operated. In addition, compared with an independent cooling tower scheme, the initial investment can be saved by more than 80%, and the initial investment cost is greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of tunnel boring machine (TBM) construction technology, and in particular, to a cooling water system shared by a TBM and an air conditioning unit, and its control method. Background Technology

[0002] During the excavation of shield tunnels, the heat dissipation from a large amount of equipment and surface moisture create harsh conditions of high temperature and humidity in the working environment. Installing air conditioning systems on the shield equipment is a common measure to improve the working environment. However, while cooling and dehumidifying, these systems also need to dissipate a significant amount of condensation heat. How to remove this condensation heat is a challenge in the field of shield tunnel air conditioning. Existing shield tunnel air conditioning systems mainly employ the following three methods to remove condensation heat:

[0003] (1) The air-cooling scheme is adopted to discharge the condensation heat to the rear end of the tunnel (non-working area). This scheme will cause the temperature at the rear end of the tunnel to rise sharply. Some of the high-temperature air will flow back to the working area due to the movement of the shield equipment and the movement of the trailer, which will seriously reduce the air conditioning effect of the working area.

[0004] (2) The solution of setting up an independent cooling tower is adopted to discharge the condensation heat to the atmosphere outside the tunnel through the cooling tower. Although this solution is reliable, it is very expensive. Since the tunnel excavation depth can reach several kilometers, the independent cooling tower can only be placed outside the tunnel. The investment in pipes and water pumps connecting the air conditioner and the cooling tower is huge, and the operation and maintenance costs of water pump power consumption and pipe extension are high.

[0005] (3) Utilizing the cooling water system built into the tunnel boring machine, the air conditioning units are connected to the main cooling water pipeline in series or parallel to achieve shared cooling water. This scheme achieves good results in ensuring air conditioning performance and saving investment and operating costs, and is currently the most widely used condensate heat discharge scheme.

[0006] However, in practical applications, the problems caused by sharing cooling water are also quite prominent, mainly manifested in the following three aspects:

[0007] (1) The cooling water volume of the tunnel boring machine is intended for cooling the process equipment. However, the cooling water volume is insufficient to supply both the tunnel boring machine and the air conditioning unit during peak load periods. When parallel water supply is used, the cooling water supply of the tunnel boring machine will often be insufficient, which will cause the oil temperature of the tunnel boring machine to exceed the temperature limit, requiring intermittent shutdown of tunneling work and affecting the tunneling progress.

[0008] (2) In order to avoid the impact of the air conditioning unit on the tunnel boring machine, a series scheme can be adopted to use the cooling water return water to provide cooling for the air conditioning unit. However, during the tunnel boring machine excavation, the average temperature of the cooling water return water can reach more than 40°C, and the temperature of the shield can even reach 50°C. At this time, the energy efficiency ratio of the air conditioning unit will drop rapidly, the cooling capacity will be insufficient, and the cooling effect of the air conditioning unit will be seriously affected.

[0009] (3) In order to avoid the impact of high-temperature cooling water return on the cooling performance of the air conditioning unit, some existing shield tunnel air conditioning units use water storage tanks to store a large amount of cooling water or prepare a large amount of chilled water for use during shield tunneling. However, this method requires a large-capacity water storage tank, which occupies a lot of space and may even require a special trailer, thus leading to a sharp increase in initial investment.

[0010] Therefore, the current cooling water system cannot guarantee the synchronous, stable, and reliable operation of the tunnel boring machine and the air conditioning unit. Summary of the Invention

[0011] This invention provides a cooling water system and its control method shared by a tunnel boring machine and an air conditioning unit, in order to solve the technical problem that existing cooling water systems cannot guarantee the synchronous, stable and reliable operation of the tunnel boring machine and the air conditioning unit.

[0012] According to one aspect of the present invention, a cooling water system shared by a tunnel boring machine and an air conditioning unit is provided, comprising a first temperature measuring device, a second temperature measuring device, a main water supply pipe, and a main water return pipe. The first temperature measuring device is used to measure the cooling water supply temperature in the main water supply pipe, and the second temperature measuring device is used to measure the oil temperature of the tunnel boring machine. One end of the main water supply pipe is connected to the outlet of a cooling water source, and the other end is connected to the cooling water inlet of the tunnel boring machine. One end of the main water return pipe is connected to the cooling water outlet of the tunnel boring machine, and the other end is connected to the return water outlet of the cooling water source.

[0013] The main water supply pipeline is provided with a first tee, a first check valve, and a second tee in sequence along the water flow direction. The main return water pipeline is provided with a third tee, a second check valve, and a fourth tee in sequence along the water flow direction. The third port of the third tee is connected to the first port of the first tee, and a first electric valve is provided between them. The third port of the fourth tee is connected to the first port of the second tee, and a second electric valve is provided between them. The second ports of the first tee and the second tee are respectively connected to the cooling water inlet and cooling water outlet of the air conditioning unit. The third port of the first tee is connected to the third port of the first tee, and a third electric valve is provided between them. The fourth port of the second tee is connected to the third port of the second tee, and a fourth electric valve is provided between them. The fourth port of the first tee is connected to the third port of the second tee, and a fifth electric valve is provided between them.

[0014] Based on the measurement results of the first and second temperature measuring devices, the system automatically controls the opening or closing of each electric valve to enable the cooling water system to automatically switch between the return water series mode and the parallel mode.

[0015] Furthermore, when the measurement result of the first temperature measuring device does not exceed the first temperature threshold, the third, fourth and fifth electric valves are automatically closed, and the first and second electric valves are opened. A portion of the cooling water return water after exchanging heat with the heat-generating components of the tunnel boring machine exchanges heat with the air conditioning unit before flowing back to the main return water pipe. At this time, the operating mode of the cooling water system is the return water series mode.

[0016] Furthermore, when the measurement result of the first temperature measuring device exceeds the first temperature threshold and the measurement result of the second temperature measuring device does not exceed the second temperature threshold, the first temperature threshold is less than the second temperature threshold. The second and third electric valves are automatically opened, and the first, fourth, and fifth electric valves are closed. Part of the cooling water from the cooling water source exchanges heat with the heat-generating components of the tunnel boring machine and flows back to the cooling water source through the return water main pipe. The other part exchanges heat with the air conditioning unit and returns to the return water main pipe. At this time, the cooling water system operates in parallel mode.

[0017] Furthermore, a buffer water tank is provided between the second port of the first four-way valve and the cooling water inlet of the air conditioning unit for storing cooling water.

[0018] Furthermore, it also includes a third temperature measuring device for measuring the return water temperature in the main return water pipe. When the measurement result of the first temperature measuring device exceeds the first temperature threshold and the measurement result of the second temperature measuring device exceeds the second temperature threshold, the electric valves are controlled to open or close based on the measurement result of the third temperature measuring device, so that the cooling water system automatically switches between the return water series mode and the internal circulation mode.

[0019] Furthermore, when the measurement result of the third temperature measuring device does not exceed the third temperature threshold, and the first temperature threshold < the third temperature threshold < the second temperature threshold, the third electric valve, the fourth electric valve, and the fifth electric valve are automatically closed, and the first electric valve and the second electric valve are opened. A portion of the cooling water return water after heat exchange with the heat-generating components of the tunnel boring machine exchanges heat with the air conditioning unit before flowing back to the main return water pipe. The operating mode of the cooling water system is the return water series mode. When the measurement result of the third temperature measuring device exceeds the third temperature threshold, the first electric valve, the second electric valve, the third electric valve, and the fourth electric valve are automatically closed, and the fifth electric valve is opened. The cooling water circulates internally between the buffer water tank and the air conditioning unit. The operating mode of the cooling water system is the internal circulation mode.

[0020] Furthermore, the volume of the buffer water tank is the product of the cooling water consumption of the air conditioning unit within 10 to 15 minutes and the surplus coefficient.

[0021] In addition, the present invention also provides a control method for a cooling water system, applicable to the cooling water system shared by the tunnel boring machine and the air conditioning unit as described above, comprising the following:

[0022] The cooling water supply temperature and the tunnel boring machine oil temperature were measured separately.

[0023] The system automatically controls the opening or closing of each electric valve based on two temperature measurement results, so that the cooling water system can automatically switch between series and parallel return water modes.

[0024] Furthermore, when the cooling water supply temperature does not exceed the first temperature threshold, the operating mode of the cooling water system is switched to the return water series mode; when the cooling water supply temperature exceeds the first temperature threshold and the oil temperature of the tunnel boring machine does not exceed the second temperature threshold, the first temperature threshold < the second temperature threshold, and the operating mode of the cooling water system is switched to the parallel mode.

[0025] Furthermore, it also includes the following:

[0026] The cooling water return temperature is measured. When the cooling water supply temperature exceeds the first temperature threshold, the tunnel boring machine's oil temperature exceeds the second temperature threshold, and the cooling water return temperature does not exceed the third temperature threshold, the first temperature threshold < the third temperature threshold < the second temperature threshold, the cooling water system's operating mode is switched to the return water series mode. When the cooling water supply temperature exceeds the first temperature threshold, the tunnel boring machine's oil temperature exceeds the second temperature threshold, and the cooling water return temperature exceeds the third temperature threshold, the cooling water system's operating mode is switched to the internal circulation mode.

[0027] The present invention has the following effects:

[0028] The cooling water system shared by the tunnel boring machine (TBM) and air conditioning unit of this invention constructs a pipeline system with switchable water flow loops between the cooling water source, the TBM, and the air conditioning unit. A first temperature measuring device and a second temperature measuring device monitor the cooling water supply temperature and the TBM oil temperature, respectively. Based on the measurement results of the first and second temperature measuring devices, the system automatically controls the opening or closing of each electric valve, thereby switching the cooling water flow loop. This allows the cooling water system to automatically switch between a series return water mode and a parallel return water mode, thus controlling the cooling water system to automatically switch to a suitable operating mode at different stages of TBM construction. This ensures that the TBM and air conditioning unit share the cooling water system and can operate synchronously, stably, and reliably. Furthermore, compared to an independent cooling tower solution, it can save more than 80% of the initial investment, significantly reducing initial investment costs.

[0029] In addition, the control method of the cooling water system of the present invention also has the above-mentioned advantages.

[0030] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0031] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0032] Figure 1 This is a schematic diagram of the pipeline connection structure of the cooling water system shared by the tunnel boring machine and the air conditioning unit in a preferred embodiment of the present invention.

[0033] Figure 2 This is a test curve of the cooling water return temperature of a tunnel boring machine in a preferred embodiment of the present invention.

[0034] Explanation of reference numerals in the attached figures

[0035] 1. Main water supply pipe; 2. Main return water pipe; 3. First tee; 4. First check valve; 5. Second tee; 6. Third tee; 7. Second check valve; 8. Fourth tee; 9. First four-way valve; 10. Second four-way valve; 11. Air conditioning unit; 12. First electric valve; 13. Second electric valve; 14. Third electric valve; 15. Fourth electric valve; 16. Fifth electric valve; 17. Buffer water tank. Detailed Implementation

[0036] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0037] like Figure 1As shown, a preferred embodiment of the present invention provides a cooling water system shared by a tunnel boring machine (TBM) and an air conditioning unit, including a first temperature measuring device (not shown), a second temperature measuring device (not shown), a main water supply pipe 1, and a main return water pipe 2. The first temperature measuring device is used to measure the cooling water supply temperature in the main water supply pipe 1, and the second temperature measuring device is used to measure the oil temperature of the TBM. One end of the main water supply pipe 1 is connected to the outlet of the cooling water source, and the other end is connected to the cooling water inlet of the TBM. One end of the main return water pipe 2 is connected to the cooling water outlet of the TBM, and the other end is connected to the return water outlet of the cooling water source. The first and second temperature measuring devices can be thermometers or temperature sensors, and the cooling water source is a cooling tower integrated into the TBM equipment. The main water supply pipe 1 is provided with a first tee 3, a first check valve 4, and a second tee 5 in sequence along the water flow direction. The main return water pipe 2 is provided with a third tee 6, a second check valve 7, and a fourth tee 8 in sequence along the water flow direction. The third port of the third tee 6 is connected to the first port of the first tee 9, and a first electric valve 12 is provided on the connecting pipe between the two. The third port of the fourth tee 8 is connected to the first port of the second tee 10, and a second electric valve 13 is provided on the connecting pipe between the two. The second port of the first tee 9 is connected to the cooling water inlet of the air conditioning unit 11. The second port of the second tee 10 is connected to the cooling water outlet of the air conditioning unit 11. The third port of the first tee 9 is connected to the third port of the first tee 3, and a third electric valve 14 is provided on the connecting pipe between the two. The fourth port of the second tee 10 is connected to the third port of the second tee 5, and a fourth electric valve 15 is provided on the connecting pipe between the first tee 9 and the third port of the second tee 10. A fifth electric valve 16 is provided on the connecting pipe between the first tee 9 and the second tee 10. It is understandable that in existing cooling water systems, the air conditioning unit 11 and the tunnel boring machine (TBM) are typically connected in series or in parallel. However, in a series connection, excessively high cooling water return temperatures during tunneling can reduce the energy efficiency ratio of the air conditioning unit 11 and result in insufficient cooling capacity. In a parallel connection, the cooling water volume of the TBM's cooling tower is insufficient to simultaneously supply both the TBM and the air conditioning unit 11 during peak load periods, leading to excessive oil temperature in the TBM and affecting the tunneling progress. To achieve stable and reliable simultaneous operation of the TBM and the air conditioning unit 11 while sharing cooling water, this invention, through extensive practical research, has discovered that the return water temperature exhibits sawtooth-like fluctuations during TBM operation. Figure 2The figure shows the cooling water return temperature test curve of a tunnel boring machine (TBM) in a city during summer. On that day, the dry-bulb temperature of the air outside the tunnel was 35℃~38℃, and the relative humidity was 62%~77%. Furthermore, considering that the TBM tunneling time generally lasts 1~2 hours, and the continuous operation time of the TBM cutterhead during tunneling is about 5~10 minutes, after deducting the temperature fluctuations during the continuous operation period of the cutterhead, the average temperature during TBM tunneling is about 36℃, and the highest temperature does not exceed 37℃. Cooling water return at this temperature can ensure the efficient and stable operation of the air conditioning unit 11. Therefore, this invention monitors the cooling water supply temperature and the shield machine oil temperature, and automatically controls the opening or closing of each electric valve based on the measurement results of the first and second temperature measuring devices. This allows the cooling water system to automatically switch between a series return water mode and a parallel mode. At different stages of shield construction, the cooling water system is automatically switched to a suitable operating mode. This ensures that the shield machine and the air conditioning unit 11 share the cooling water system and can operate synchronously, stably, and reliably. In addition, compared with the independent cooling tower solution, it can save more than 80% of the initial investment, greatly reducing the initial investment cost.

[0038] It is understood that the cooling water system shared by the tunnel boring machine and the air conditioning unit in this embodiment constructs a pipeline system with switchable water flow loops between the cooling water source, the tunnel boring machine, and the air conditioning unit 11. The cooling water supply temperature and the tunnel boring machine oil temperature are monitored by a first temperature measuring device and a second temperature measuring device, respectively. Based on the measurement results of the first temperature measuring device and the second temperature measuring device, the electric valves are automatically controlled to open or close, thereby switching the cooling water flow loops. This allows the cooling water system to automatically switch between a series return water mode and a parallel return water mode. This enables the cooling water system to automatically switch to a suitable operating mode at different stages of tunnel boring construction. This ensures that the tunnel boring machine and the air conditioning unit 11 share the cooling water system and can operate synchronously, stably, and reliably. In addition, compared with the independent cooling tower solution, it can save more than 80% of the initial investment, greatly reducing the initial investment cost.

[0039] Specifically, when the measurement result of the first temperature measuring device does not exceed the first temperature threshold, the third electric valve 14, the fourth electric valve 15 and the fifth electric valve 16 are automatically closed, and the first electric valve 12 and the second electric valve 13 are opened. The cooling water supplied by the cooling water source flows directly into the tunnel boring machine. After exchanging heat with the heat-generating components of the tunnel boring machine, part of the cooling water return water exchanges heat with the air conditioning unit 11 and then flows back to the return water main pipe 2. The other part of the cooling water return water flows directly back to the cooling water source through the return water main pipe 2. At this time, the operation mode of the cooling water system is the return water series mode.

[0040] It is understandable that when the cooling water supply temperature T gWhen the temperature does not exceed the first temperature threshold, the cooling water supply temperature is low. In order to prevent the air conditioning unit 11 from having a refrigerant flow failure due to the low cooling water temperature, the cooling water system adopts a return water series mode. The cooling water return water after exchanging heat with the heat-generating components of the tunnel boring machine is used to exchange heat with the air conditioning unit 11. This ensures that the air conditioning unit 11 can operate normally and stably, and makes full use of the cooling capacity of the cooling water return water.

[0041] Furthermore, when the measurement result of the first temperature measuring device exceeds the first temperature threshold and the measurement result of the second temperature measuring device does not exceed the second temperature threshold, the first temperature threshold is less than the second temperature threshold. The second electric valve 13 and the third electric valve 14 are automatically opened, and the first electric valve 12, the fourth electric valve 15, and the fifth electric valve 16 are closed. Part of the cooling water from the cooling water source exchanges heat with the heat-generating components of the tunnel boring machine and then flows back to the cooling water source through the main return water pipe 2. The other part exchanges heat directly with the air conditioning unit 11 and then returns to the main return water pipe 2, flowing back to the cooling water source. At this time, the cooling water system operates in parallel mode. The first and second temperature thresholds can be set according to actual conditions. The second temperature threshold is usually set based on the limit value of the tunnel boring machine oil temperature, generally slightly less than the oil temperature limit value. This invention uses a first temperature threshold of 25℃ and a second temperature threshold of 50℃ as an example for illustration, and no specific limitations are made here.

[0042] It is understandable that when the cooling water supply temperature T g Exceeding the first temperature threshold and the tunnel boring machine oil temperature T o When the temperature does not exceed the second temperature threshold, the cooling water supply temperature is suitable. The cooling water system adopts a parallel mode. The cooling water supplied by the cooling water source is split and then exchanged with the heat-generating components of the tunnel boring machine and the air conditioning unit 11. After heat exchange, the two return water streams converge in the return water main pipe 2 and flow back to the cooling water source. Since the cooling water supply temperature is suitable, the cooling water supplied by the cooling water source directly exchanges heat with the air conditioning unit 11, which will not cause faults such as low cooling capacity or excessive exhaust temperature. At the same time, the tunnel boring machine oil temperature does not exceed the limit value. The cooling water diverted by the air conditioning unit 11 will not have an adverse effect on the cooling effect of the tunnel boring machine, ensuring that the air conditioning unit 11 and the tunnel boring machine can operate stably and reliably at the same time.

[0043] Optionally, a buffer water tank 17 is also provided between the second port of the first four-way connector 9 and the cooling water inlet of the air conditioning unit 11 for storing cooling water. The cooling water in the buffer water tank 17 can be pre-stored before construction, or it can be stored in a series or parallel return water mode. By storing cooling water in the buffer water tank 17, a continuous supply of cooling water can be provided to the air conditioning unit 11. Furthermore, the buffer water tank 17 is connected to the air conditioning unit 11 via a pressurized water pipe. The buffer water tank 17 is a pressurized water tank, and its pressure-bearing capacity is related to the head of the shield machine's cooling water circulation pump, generally not less than 0.5 MPa. Preferably, to ensure a continuous and reliable supply of cooling water to the air conditioning unit 11 and to minimize the volume of the buffer water tank 17, the volume of the buffer water tank 17 is the product of the cooling water consumption of the air conditioning unit 11 within 10 to 15 minutes and a surplus coefficient, wherein the surplus coefficient is generally between 1.1 and 1.3, preferably 1.2.

[0044] In addition, a third temperature measuring device is included for measuring the temperature of the cooling water return in the main return water pipe 2. This third temperature measuring device can be a thermometer or a temperature sensor. To ensure the synchronous, reliable, and stable operation of the tunnel boring machine and the air conditioning unit 11 while effectively reducing the energy consumption of the cooling water source, and considering that the temperature fluctuations during tunnel boring excluding the continuous operation period of the cutterhead, the maximum cooling water return temperature does not exceed 37°C, and at this temperature, the cooling water return can ensure the efficient and stable operation of the air conditioning unit 11. Since the continuous operation time of the cutterhead is relatively short, during the remaining time during tunnel boring excluding the continuous operation period of the cutterhead, the cooling water return after heat exchange with the heat-generating components of the tunnel boring machine can be used again to exchange heat with the air conditioning unit 11, further improving the cooling water utilization rate. That is, when the measurement result of the first temperature measuring device exceeds the first temperature threshold and the measurement result of the second temperature measuring device exceeds the second temperature threshold, for example, T... g >25℃ and T o When the temperature is >50℃, the electric valves are controlled to open or close based on the measurement results of the third temperature measuring device, so that the cooling water system can automatically switch between the return water series mode and the internal circulation mode.

[0045] Specifically, when the measurement result of the third temperature measuring device does not exceed the third temperature threshold (first temperature threshold < third temperature threshold < second temperature threshold), the third electric valve 14, the fourth electric valve 15, and the fifth electric valve 16 are automatically closed, while the first electric valve 12 and the second electric valve 13 are opened. A portion of the cooling water return water after heat exchange with the heat-generating components of the tunnel boring machine exchanges heat with the air conditioning unit 11 before flowing back to the main return water pipe 2. The operating mode of the cooling water system is the return water series mode. When the measurement result of the third temperature measuring device exceeds the third temperature threshold, the first electric valve 12, the second electric valve 13, the third electric valve 14, and the fourth electric valve 15 are automatically closed, while only the fifth electric valve 16 is opened. The cooling water circulates internally between the buffer water tank 17 and the air conditioning unit 11. The operating mode of the cooling water system is the internal circulation mode. When the temperature of the cooling water that exchanges heat with the air conditioning unit 11 exceeds the third temperature threshold, the energy efficiency ratio of the air conditioning unit 11 will decrease rapidly, resulting in insufficient cooling capacity. Therefore, the specific value of the third temperature threshold needs to be set according to the different models of the air conditioning unit 11. In this invention, the third temperature threshold of 38°C is selected as an example for illustration, and no specific limitation is made here.

[0046] It is understandable that when the cooling water supply temperature T g At >25℃, compared to T g At temperatures ≤25℃, the cooling water source can effectively reduce its own energy consumption. Additionally, because the tunnel boring machine's oil temperature T is at this temperature... o If the cooling water temperature exceeds 50℃ and the cooling water system is connected in parallel, the cooling water supply from the air conditioning unit 11 will affect the cooling effect of the tunnel boring machine (TBM), leading to insufficient cooling water volume and consequently causing the TBM oil temperature to exceed the limit, thus affecting the tunneling progress. Furthermore, due to the high TBM oil temperature, the return temperature of the cooling water after heat exchange with the TBM is also relatively high. It is necessary to prevent a significant decrease in the energy efficiency ratio of the air conditioning unit 11 due to the high return temperature. Therefore, by monitoring the cooling water return temperature in the main return water pipe 2, if the cooling water return temperature T... h When the temperature is ≤38℃, the cooling water return will not cause a significant decrease in the energy efficiency ratio of the air conditioning unit 11, and the cooling water system adopts a return water series mode at this time. However, when the cooling water return temperature T... hWhen the temperature exceeds 38℃, the return water temperature is high. If the return water is used for heat exchange with the air conditioning unit 11, the energy efficiency ratio will be significantly reduced, resulting in insufficient cooling capacity. Therefore, the cooling water system adopts an internal circulation mode to avoid the adverse effects of short-term peak high temperatures of the tunnel boring machine's return water on the air conditioning unit 11. By setting up a buffer water tank 17 and controlling the cooling water system to automatically switch between the return water series mode and the internal circulation mode based on the measurement results of the third temperature measuring device, not only can the tunnel boring machine and the air conditioning unit 11 operate synchronously and stably, but also, compared with the parallel + water storage scheme, more than 50% of the initial investment can be saved, and the volume of the water tank can be reduced by more than 70%.

[0047] In addition, another embodiment of the present invention provides a control method for a cooling water system, applicable to the cooling water system shared by the tunnel boring machine and the air conditioning unit as described above, including the following:

[0048] The cooling water supply temperature and the tunnel boring machine oil temperature were measured separately.

[0049] The system automatically controls the opening or closing of each electric valve based on two temperature measurement results, so that the cooling water system can automatically switch between series and parallel return water modes.

[0050] It is understood that the cooling water system control method of this embodiment controls the opening or closing of each electric valve based on the monitoring results of the cooling water supply temperature and the shield machine oil temperature, thereby automatically switching the cooling water system between the return water series mode and the parallel mode. This allows the cooling water system to be automatically switched to the appropriate operating mode at different stages of shield construction, ensuring that the shield machine and the air conditioning unit 11 share the cooling water system and that both can operate synchronously, stably and reliably. In addition, compared with the independent cooling tower solution, it can save more than 80% of the initial investment, greatly reducing the initial investment cost.

[0051] It is understandable that when the cooling water supply temperature does not exceed the first temperature threshold, the operating mode of the cooling water system is switched to the return water series mode; when the cooling water supply temperature exceeds the first temperature threshold and the oil temperature of the tunnel boring machine does not exceed the second temperature threshold, the first temperature threshold < the second temperature threshold, and the operating mode of the cooling water system is switched to the parallel mode.

[0052] Optionally, the control method for the cooling water system further includes the following:

[0053] The cooling water return temperature is measured. When the cooling water supply temperature exceeds the first temperature threshold, the tunnel boring machine's oil temperature exceeds the second temperature threshold, and the cooling water return temperature does not exceed the third temperature threshold, the first temperature threshold < the third temperature threshold < the second temperature threshold, the cooling water system's operating mode is switched to the return water series mode. When the cooling water supply temperature exceeds the first temperature threshold, the tunnel boring machine's oil temperature exceeds the second temperature threshold, and the cooling water return temperature exceeds the third temperature threshold, the cooling water system's operating mode is switched to the internal circulation mode.

[0054] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0055] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code. The solutions in the embodiments of this application can be implemented in various computer languages, such as the object-oriented programming language Java and the interpreted scripting language JavaScript.

[0056] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0057] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1The function specified in one or more boxes.

[0058] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0059] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0060] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A cooling water system shared by a tunnel boring machine and an air conditioning unit, characterized in that, It includes a first temperature measuring device, a second temperature measuring device, a main water supply pipe (1) and a main return water pipe (2). The first temperature measuring device is used to measure the cooling water supply temperature in the main water supply pipe (1), and the second temperature measuring device is used to measure the oil temperature of the tunnel boring machine. One end of the main water supply pipe (1) is connected to the outlet of the cooling water source and the other end is connected to the cooling water inlet of the tunnel boring machine. One end of the main return water pipe (2) is connected to the cooling water outlet of the tunnel boring machine and the other end is connected to the return water inlet of the cooling water source. The main water supply pipeline (1) is provided with a first tee (3), a first check valve (4), and a second tee (5) in sequence along the water flow direction. The main return water pipeline (2) is provided with a third tee (6), a second check valve (7), and a fourth tee (8) in sequence along the water flow direction. The third port of the third tee (6) is connected to the first port of the first tee (9), and a first electric valve (12) is provided between them. The third port of the fourth tee (8) is connected to the first port of the second tee (10), and a second electric valve (13) is provided between them. The first tee (9) The second port of the first four-way (9) is connected to the cooling water inlet of the air conditioning unit (11), the second port of the second four-way (10) is connected to the cooling water outlet of the air conditioning unit (11), the third port of the first four-way (9) is connected to the third port of the first three-way (3) and a third electric valve (14) is provided between them, the fourth port of the second four-way (10) is connected to the third port of the second three-way (5) and a fourth electric valve (15) is provided between them, and the fourth port of the first four-way (9) is connected to the third port of the second four-way (10) and a fifth electric valve (16) is provided between them. Based on the measurement results of the first and second temperature measuring devices, the system automatically controls the opening or closing of each electric valve to enable the cooling water system to automatically switch between the return water series mode and the parallel mode.

2. The cooling water system shared by the tunnel boring machine and the air conditioning unit as described in claim 1, characterized in that, When the measurement result of the first temperature measuring device does not exceed the first temperature threshold, the third electric valve (14), the fourth electric valve (15) and the fifth electric valve (16) are automatically closed, and the first electric valve (12) and the second electric valve (13) are opened. A portion of the cooling water return water after exchanging heat with the heat-generating components of the tunnel boring machine exchanges heat with the air conditioning device (11) and then flows back to the return water main pipe (2). At this time, the operating mode of the cooling water system is the return water series mode.

3. The cooling water system shared by the tunnel boring machine and the air conditioning unit as described in claim 1, characterized in that, When the measurement result of the first temperature measuring device exceeds the first temperature threshold and the measurement result of the second temperature measuring device does not exceed the second temperature threshold, the first temperature threshold is less than the second temperature threshold. The second electric valve (13) and the third electric valve (14) are automatically controlled to open, and the first electric valve (12), the fourth electric valve (15) and the fifth electric valve (16) are controlled to close. Part of the cooling water from the cooling water source exchanges heat with the heat-generating components of the tunnel boring machine and flows back to the cooling water source through the return water main pipe (2). The other part exchanges heat with the air conditioning device (11) and returns to the return water main pipe (2). At this time, the operating mode of the cooling water system is parallel mode.

4. The cooling water system shared by the tunnel boring machine and the air conditioning unit as described in claim 1, characterized in that, A buffer water tank (17) is also provided between the second port of the first four-way (9) and the cooling water inlet of the air conditioning unit (11) for storing cooling water.

5. The cooling water system shared by the tunnel boring machine and the air conditioning unit as described in claim 4, characterized in that, It also includes a third temperature measuring device for measuring the temperature of the cooling water return in the main return pipe (2). When the measurement result of the first temperature measuring device exceeds the first temperature threshold and the measurement result of the second temperature measuring device exceeds the second temperature threshold, the electric valves are controlled to open or close based on the measurement result of the third temperature measuring device, so that the cooling water system can automatically switch between the return water series mode and the internal circulation mode.

6. The cooling water system shared by the tunnel boring machine and the air conditioning unit as described in claim 5, characterized in that, When the measurement result of the third temperature measuring device does not exceed the third temperature threshold, the first temperature threshold < the third temperature threshold < the second temperature threshold, and the third electric valve (14), the fourth electric valve (15) and the fifth electric valve (16) are automatically closed, and the first electric valve (12) and the second electric valve (13) are opened. A portion of the cooling water return water after exchanging heat with the heat-generating components of the tunnel boring machine exchanges heat with the air conditioning unit (11) and then flows back to the return water main pipe (2). The operating mode of the cooling water system is the return water series mode. When the measurement result of the third temperature measuring device exceeds the third temperature threshold, the first electric valve (12), the second electric valve (13), the third electric valve (14) and the fourth electric valve (15) are automatically closed, and the fifth electric valve (16) is opened. The cooling water circulates internally between the buffer water tank (17) and the air conditioning unit (11). The operating mode of the cooling water system is the internal circulation mode.

7. The cooling water system shared by the tunnel boring machine and the air conditioning unit as described in claim 4, characterized in that, The volume of the buffer water tank (17) is the product of the cooling water consumption of the air conditioning device (11) within 10 to 15 minutes and the surplus coefficient.

8. A control method for a cooling water system, applicable to a cooling water system shared by a tunnel boring machine and an air conditioning unit as described in any one of claims 1 to 7, characterized in that, Includes the following: The cooling water supply temperature and the tunnel boring machine oil temperature were measured separately. The system automatically controls the opening or closing of each electric valve based on two temperature measurement results, so that the cooling water system can automatically switch between series and parallel return water modes.

9. The control method for a cooling water system as described in claim 8, characterized in that, When the cooling water supply temperature does not exceed the first temperature threshold, the operating mode of the cooling water system is switched to the return water series mode; when the cooling water supply temperature exceeds the first temperature threshold and the oil temperature of the tunnel boring machine does not exceed the second temperature threshold, the first temperature threshold is less than the second temperature threshold, and the operating mode of the cooling water system is switched to the parallel mode.

10. The control method for a cooling water system as described in claim 9, characterized in that, Also includes the following: The cooling water return temperature is measured. When the cooling water supply temperature exceeds the first temperature threshold, the tunnel boring machine's oil temperature exceeds the second temperature threshold, and the cooling water return temperature does not exceed the third temperature threshold, the first temperature threshold < the third temperature threshold < the second temperature threshold, the cooling water system's operating mode is switched to the return water series mode. When the cooling water supply temperature exceeds the first temperature threshold, the tunnel boring machine's oil temperature exceeds the second temperature threshold, and the cooling water return temperature exceeds the third temperature threshold, the cooling water system's operating mode is switched to the internal circulation mode.

Images