Refrigerating system for shield tunneling machine and shield tunneling machine

Abstract

The invention relates to a refrigerating system for a shield tunneling machine and the shield tunneling machine. The refrigerating system for the shield tunneling machine comprises a first heat exchanger and a second heat exchanger, a refrigerating medium flows through the main circulation pipeline, and a compressor, a first heat exchanger and a steam-water separator are sequentially arranged on the main circulation pipeline; the main circulation pipeline is connected with a first cooling loop and a second cooling loop which are connected in parallel, the first cooling loop is provided with at least one first heat production device, the second cooling loop is provided with at least one second heat production device, and the heat production rate of the first heat production device is larger than that of the second heat production device. The shield tunneling machine cooling system solves the technical problems that an existing shield tunneling machine cooling system is poor in applicability to underground working environments and equipment, and refrigeration cannot be continued under the power failure condition.

Description

Technical Field

[0001] The invention relates to the technical field of tunneling engineering, and in particular to a refrigeration system for a shield machine and the shield machine. Background Art

[0002] Due to its complex system, many parts and high power, shield machines generate a lot of heat during construction. In addition, the underground construction space is small and the air circulation is poor, which makes the construction environment of shield machines have the characteristics of high temperature and high humidity. The high temperature operation of the heat-generating components in the shield machine will seriously affect the performance and life of the components. With the widespread application of electric-driven shield machines, the heating phenomenon has a more serious impact.

[0003] At present, the conventional cooling system of the shield machine is an external circulating water system combined with an internal circulating water system. The internal circulating water system includes a water pump, a water tank, a heat exchanger and pipes. The external circulating water system includes an external circulating water pump, a cooling tower, and water inlet and outlet pipes. The cooling water in the internal circulating water system takes away the heat from the heat-generating components on the equipment, and the cooling water in the external circulating water system takes away the heat in the internal circulating water system. However, for the conventional shield machine cooling system, there is still the problem of low heat exchange efficiency. When the outside temperature is high, the cooling effect is poor, and it is difficult to improve the underground working environment and equipment operating environment; the cooling of equipment with different heat-generating powers is carried out in the same way, which depends on the flow rate of the cooling medium and cannot be coordinated. Management; in addition, in the event of a power outage, the shield machine cooling system cannot continue to cool, which brings great trouble to the work of the fault maintenance personnel.

[0004] With regard to the problems in related technologies, the existing shield machine cooling system has poor applicability to underground working environments and equipment, and cannot continue cooling in the event of a power outage. No effective solution has yet been given.

[0005] Therefore, the inventor, relying on many years of experience and practice in related industries, proposes a refrigeration system for a shield machine and a shield machine to overcome the defects of the prior art. Summary of the invention

[0006] The object of the present invention is to provide a refrigeration system and a shield machine for a shield machine, which performs graded thermal management on high heat production rate equipment and low heat production rate equipment in the shield machine, adopts different cooling methods for different heat production equipment, is more suitable for underground working environments and equipment, effectively improves the refrigeration efficiency of the equipment, and improves the refrigeration effect.

[0007] The purpose of the present invention can be achieved by adopting the following scheme:

[0008] The present invention provides a refrigeration system for a shield machine, comprising:

[0009] A first heat exchanger, wherein the first heat exchanger is used to exchange heat with a water cooling device;

[0010] A main circulation pipeline for the refrigerant medium to flow through, wherein a compressor, the first heat exchanger and a steam-water separator are sequentially arranged on the main circulation pipeline along the flow direction of the refrigerant medium, and the compressor, the first heat exchanger and the steam-water separator are connected end to end through the main circulation pipeline to form a circulatory annular flow path;

[0011] The main circulation pipeline is connected to a first cooling circuit and a second cooling circuit in parallel, the first cooling circuit is provided with at least one first heat generating device, the second cooling circuit is provided with at least one second heat generating device, and the heat generating rate of the first heat generating device is greater than the heat generating rate of the second heat generating device.

[0012] In a preferred embodiment of the present invention, along the flow direction of the refrigerant medium, the first cooling circuit is connected to the main circulation pipeline downstream of the first heat exchanger, the second cooling circuit is connected to the main circulation pipeline downstream of the first heat exchanger, a second heat exchanger is provided on the second cooling circuit, the second heat exchanger is connected to the second heat generating equipment, and the second heat exchanger is used to exchange heat with the second heat generating equipment.

[0013] In a preferred embodiment of the present invention, the water cooling device includes a cooling tower, the first pipeline in the first heat exchanger for the cooling medium to flow through is connected to the cooling tower, and a first circulating pump is arranged between the first heat exchanger and the cooling tower to allow the cooling medium to circulate between the first heat exchanger and the cooling tower.

[0014] In a preferred embodiment of the present invention, a first three-way valve is provided on the main circulation pipeline, one end of the first cooling circuit is connected to the main circulation pipeline through the first three-way valve, and the other end of the first cooling circuit is connected to the inlet of the steam-water separator or to the main circulation pipeline near the inlet of the steam-water separator.

[0015] In a preferred embodiment of the present invention, the first heat generating device comprises a plurality of first heat generating devices connected in parallel to the first cooling circuit, the cooling medium inlets of the plurality of first heat generating devices or the pipelines connected to the cooling medium inlets of the first heat generating devices are respectively provided with first electromagnetic expansion valves, and the cooling medium outlets of the plurality of first heat generating devices or the pipelines connected to the cooling medium outlets of the first heat generating devices are respectively provided with first check valves to prevent backflow;

[0016] Among them, the plurality of the first heat generating devices include a motor and a frequency converter for controlling the operation of the shield machine.

[0017] In a preferred embodiment of the present invention, a second three-way valve is provided on the main circulation pipeline, one end of the second cooling circuit is connected to the main circulation pipeline through the second three-way valve, and the other end of the second cooling circuit is connected to the inlet of the steam-water separator or to the main circulation pipeline near the inlet of the steam-water separator.

[0018] In a preferred embodiment of the present invention, a second electromagnetic expansion valve is provided on the second cooling circuit upstream of the second heat exchanger along the flow direction of the refrigerant medium in the second cooling circuit;

[0019] And / or, a second one-way valve for preventing backflow is provided on the second cooling circuit downstream of the second heat exchanger.

[0020] In a preferred embodiment of the present invention, the second heat generating device is connected to the second heat exchanger via a heat exchange pipeline, and the second heat exchanger exchanges heat between the refrigerant medium flowing through the heat exchange pipeline and the refrigerant medium flowing through the second cooling circuit;

[0021] A second circulation pump and a pressure stabilizer are provided on the heat exchange pipeline located upstream of the second heat exchanger.

[0022] In a preferred embodiment of the present invention, the second heat generating device comprises at least two second heat generating devices connected in parallel to the heat exchange pipeline, and the pipelines respectively connected to the cooling medium inlets of the two second heat generating devices are connected to the heat exchange pipeline via a third three-way valve;

[0023] The two second heat generating devices include a hydraulic oil tank for supplying hydraulic oil to the shield machine and a gear oil tank for supplying gear oil to the shield machine.

[0024] In a preferred embodiment of the present invention, at least one first air-cooled evaporator is provided on the main circulation pipeline and between the first heat exchanger and the steam-water separator, and the first air-cooled evaporator is arranged in the ventilation duct of the tunnel;

[0025] Along the flow direction of the refrigerant medium in the main circulation pipeline, a refrigeration solenoid valve and a third solenoid expansion valve are sequentially arranged on the main circulation pipeline upstream of the first air-cooled evaporator, and a third one-way valve for preventing backflow is arranged on the main circulation pipeline downstream of the first air-cooled evaporator.

[0026] In a preferred embodiment of the present invention, the refrigeration system for the shield machine further comprises a phase-change cold storage device, the phase-change cold storage device is connected to the main circulation pipeline through a third cooling circuit, the phase-change cold storage device is connected to a second air-cooled evaporator, and the second air-cooled evaporator is arranged in a ventilation duct of the tunnel;

[0027] A third circulating pump is arranged on the pipeline between the phase-change cold storage device and the second air-cooled evaporator.

[0028] In a preferred embodiment of the present invention, a fourth three-way valve is provided on the main circulation pipeline between the first heat exchanger and the first air-cooled evaporator, one end of the third cooling circuit is connected to the main circulation pipeline through the fourth three-way valve, and the other end of the third cooling circuit is connected to the inlet of the steam-water separator or to the main circulation pipeline near the inlet of the steam-water separator;

[0029] Along the flow direction of the refrigerant medium in the third cooling circuit, a fourth electromagnetic expansion valve is arranged on the third cooling circuit located upstream of the phase change cold storage device, and a fourth one-way valve for preventing backflow is arranged on the third cooling circuit located downstream of the phase change cold storage device.

[0030] The present invention provides a shield machine, which comprises the above-mentioned refrigeration system for the shield machine.

[0031] As described above, the refrigeration system for a shield machine and the shield machine of the present invention have the following characteristics and advantages:

[0032] A compressor, a first heat exchanger and a steam-water separator are arranged on the main circulation pipeline. The compressor, the first heat exchanger and the steam-water separator are connected end to end through the main circulation pipeline to form a circulatory annular flow path. During operation, the first heat exchanger exchanges heat with the cooling medium in the water cooling device, thereby cooling down the refrigerant medium in the main circulation pipeline and circulating through the first heat exchanger, so as to achieve a continuous cooling effect and ensure the continuous and stable operation of various equipment in the shield machine;

[0033] In addition, each device in the shield machine is divided into a first heat generating device and a second heat generating device according to the heat generating rate. The heat generating rate of the first heat generating device is greater than that of the second heat generating device. The first heat generating device and the second heat generating device are respectively connected to the main circulation pipeline through the first cooling circuit and the second cooling circuit. Different methods are adopted for cooling and cooling down the devices with different heat generating rates, which can not only meet the cooling effect, but also make full use of the cooled refrigerant medium. By performing graded cooling management on the devices with different heat generating rates, the cooling efficiency of the equipment is improved, so as to achieve a good cooling effect for each device in the shield machine in a special tunnel environment, and ensure the safe and stable working state of the shield machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The following drawings are only intended to illustrate and explain the present invention, and are not intended to limit the scope of the present invention.

[0035] in:

[0036] Figure 1 : It is a structural schematic diagram of the refrigeration system for a shield machine of the present invention.

[0037] The accompanying drawings in the present invention are:

[0038] 1. Water cooling device; 2. First heat exchanger;

[0039] 3. The first circulation pump; 4. The compressor;

[0040] 5. First heat generating device; 501. First heat generating device;

[0041] 502, a first electromagnetic expansion valve; 503, a first one-way valve;

[0042] 504, a first controller; 505, a first pressure gauge;

[0043] 506. first temperature meter; 6. second heat generating device;

[0044] 601, a second heat generating device; 602, a third three-way valve;

[0045] 7. First three-way valve; 8. Second three-way valve;

[0046] 9. Second heat exchanger; 10. Second electromagnetic expansion valve;

[0047] 11. Second one-way valve; 12. Second circulation pump;

[0048] 13. Voltage stabilizer; 14. Fourth three-way valve;

[0049] 15. Steam-water separator; 16. Second controller;

[0050] 17. The first air-cooled evaporator; 18. Refrigeration solenoid valve;

[0051] 19. The third electromagnetic expansion valve; 20. The third one-way valve;

[0052] 21. Second pressure gauge; 22. Second temperature gauge;

[0053] 23. Phase change cold storage device; 24. Second air-cooled evaporator;

[0054] 25. The fourth electromagnetic expansion valve; 26. The third circulation pump;

[0055] 27. The fourth one-way valve; 28. The main circulation pipeline;

[0056] 29. A first cooling circuit; 30. A second cooling circuit;

[0057] 31. Heat exchange pipeline; 32. The third cooling circuit. DETAILED DESCRIPTION

[0058] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the present invention by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0059] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0060] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0061] Implementation Method 1

[0062] like Figure 1 As shown, the present invention provides a refrigeration system for a shield machine, which includes: a first heat exchanger 2, the first heat exchanger 2 is used to exchange heat with a water cooling device 1; a main circulation pipeline 28 for a refrigerant medium to flow through, along the flow direction of the refrigerant medium, a compressor 4, a first heat exchanger 2 and a steam-water separator 15 are sequentially arranged on the main circulation pipeline 28, and the compressor 4, the first heat exchanger 2 and the steam-water separator 15 are connected end to end through the main circulation pipeline 28 to form a circulatory annular flow path; a first cooling circuit 29 and a second cooling circuit 30 connected in parallel are connected to the main circulation pipeline 28, at least one first heat generating device 5 is arranged on the first cooling circuit 29, and at least one second heat generating device 6 is arranged on the second cooling circuit 30, and the heat generating rate of the first heat generating device 5 is greater than the heat generating rate of the second heat generating device 6.

[0063] The heat generation rate is the rate at which a device generates heat per unit area, which can be used to evaluate the heat generation capacity of the device.

[0064] Specifically, Figure 1As shown, along the flow direction of the refrigerant medium, the first cooling circuit 29 is connected to the main circulation pipeline 28 downstream of the first heat exchanger 2, and the second cooling circuit 30 is connected to the main circulation pipeline 28 downstream of the first heat exchanger 2. The second heat exchanger 9 is provided on the second cooling circuit 30, and the second heat exchanger 9 is connected to the second heat generating device 6. The second heat exchanger 9 is used to exchange heat with the second heat generating device 6.

[0065] In the present invention, a compressor 4, a first heat exchanger 2 and a steam-water separator 15 are arranged on the main circulation pipeline 28. The compressor 4, the first heat exchanger 2 and the steam-water separator 15 are connected end to end through the main circulation pipeline 28 to form a circulatory annular flow path. During operation, the first heat exchanger 2 exchanges heat with the cooling medium in the water cooling device 1, thereby cooling the refrigerant medium in the main circulation pipeline 28 and circulating through the first heat exchanger 2, so as to achieve a continuous cooling effect and ensure the continuous and stable operation of various equipment in the shield machine.

[0066] In the present invention, each device in the shield machine (including a motor and a frequency converter for controlling the operation of the shield machine, a hydraulic oil tank for supplying hydraulic oil to the shield machine, a gear oil tank for supplying gear oil to the shield machine, etc.) is divided into a first heat generating device 5 and a second heat generating device 6 according to the heat generating rate, wherein the heat generating rate of the first heat generating device 5 is greater than the heat generating rate of the second heat generating device 6, and the first heat generating device 5 and the second heat generating device 6 are respectively connected to the main circulation pipeline 28, and the first heat generating device 5 with a higher heat generating rate is directly heat exchanged with a refrigerant medium for phase change cooling, while the second heat generating device 6 with a lower heat generating rate is indirectly phase-changed by a second heat exchanger 9. Different cooling and temperature reduction methods are adopted according to devices with different heat generating rates, which can not only meet the cooling effect, but also make full use of the cooled refrigerant medium. By performing graded cooling management on devices with different heat generating rates, the cooling efficiency of the equipment is improved, thereby achieving a good cooling effect for each device in the shield machine in a special tunnel environment, and ensuring the safe and stable working state of the shield machine.

[0067] In the present invention, pure natural carbon dioxide can be used as a refrigerant for cooling various devices in the shield machine, which is not only environmentally friendly and meets the development needs of the green shield, but also the supercritical carbon dioxide medium has the characteristics of large sealing and low viscosity, and can achieve a good heat exchange effect, so that it can meet the requirements of cooling and temperature reduction as a refrigerant. It should be noted that the refrigerant can also use other refrigerants (such as tetrafluoroethane and other refrigerants), and the type of the refrigerant used is not limited here.

[0068] In an optional embodiment of the present invention, Figure 1As shown, the water cooling device 1 includes a cooling tower, which can store and cool the external water supply (i.e., cooling medium). Further, the first heat exchanger 2 can be, but is not limited to, a plate heat exchanger, and the first heat exchanger 2 has a first pipeline and a second pipeline for parallel heat exchange. The first heat exchanger 2 is connected to the cooling tower through the first pipeline, and the cooling medium in the cooling tower can circulate through the first pipeline of the first heat exchanger 2. The first heat exchanger 2 is connected to the main circulation pipeline 28 through the second pipeline. The refrigerant medium in the main circulation pipeline 28 can flow through the second pipeline of the first heat exchanger 2, and exchange heat with the cooling medium flowing through the first pipeline of the first heat exchanger 2 during the process of flowing through the second pipeline of the first heat exchanger 2, so as to achieve the purpose of cooling the refrigerant medium.

[0069] Further, such as Figure 1 As shown, a first circulation pump 3 is arranged between the first heat exchanger 2 and the cooling tower. The first circulation pump 3 provides a driving force for the cooling medium to flow between the first heat exchanger 2 and the cooling tower, so that the cooling medium in the cooling tower is output to the first heat exchanger 2, and the cooling medium flowing through the first heat exchanger 2 (after heat exchange) is cooled and lowered in the return flow to the cooling tower, thereby realizing the recycling of the cooling medium.

[0070] In an optional embodiment of the present invention, Figure 1 As shown, a first three-way valve 7 is provided on the main circulation pipeline 28. Along the flow direction of the refrigerant in the main circulation pipeline 28, the first three-way valve 7 is located downstream of the first heat exchanger 2. One end of the first cooling circuit 29 is connected to the main circulation pipeline 28 through the first three-way valve 7, and the other end of the first cooling circuit 29 is connected to the inlet of the steam-water separator 15 or to the main circulation pipeline 28 near the inlet of the steam-water separator 15. In the case where the first heat generating device 5 needs to be cooled, the main circulation pipeline 28 can be connected to the first cooling circuit 29 by controlling the on-off relationship of different interfaces in the first three-way valve 7. At this time, at least part of the refrigerant in the main circulation pipeline 28 flowing through the first heat exchanger 2 can flow into the first heat generating device 5 through the first three-way valve 7 and the first cooling circuit 29 in sequence, so that the first heat generating device 5 is cooled by phase change in a direct heat exchange manner, thereby achieving the purpose of cooling the first heat generating device 5.

[0071] Further, such as Figure 1As shown, the first heat generating device 5 can be a single heat generating device, or can be a plurality of heat generating devices. When the first heat generating device 5 includes a plurality of first heat generating devices 501, the plurality of first heat generating devices 501 are connected in parallel to the first cooling circuit 29 through a plurality of pipelines, and the cooling medium inlets of the plurality of first heat generating devices 501 or the pipelines connected to the cooling medium inlets of the first heat generating devices 501 are respectively provided with first electromagnetic expansion valves 502, and the cooling medium outlets of the plurality of first heat generating devices 501 or the pipelines connected to the cooling medium outlets of the first heat generating devices 501 are respectively provided with first check valves 503 to prevent backflow, and the on-off state of the corresponding pipeline can be controlled by the first electromagnetic expansion valve 502, so that the refrigerant medium can selectively flow through the first heat generating device 501, so that the refrigerant medium enters the first heat generating device 501 whose actual temperature reaches the preset temperature threshold, thereby achieving the purpose of targeted cooling and temperature reduction. The first one-way valve 503 is provided to prevent the refrigerant medium flowing out of the first heat generating device 501 from flowing back into the first heat generating device 501 .

[0072] In the present invention, the plurality of first heat generating devices 501 may include but are not limited to motors, frequency converters (frequency converter cabinets) and transformers for controlling the shield machine, wherein the number of motors, frequency converters and transformers may also be multiple.

[0073] Further, such as Figure 1 As shown, a first pressure gauge 505 and a first thermometer 506 are provided at the cooling medium outlet of the first heat generating device 501 or at the pipeline connected to the cooling medium outlet of the first heat generating device 501. The pressure of the refrigerant outputted from the cooling medium outlet of the first heat generating device 501 is detected by the first pressure gauge 505, and the temperature of the refrigerant outputted from the cooling medium outlet of the first heat generating device 501 is detected by the first thermometer 506, so as to understand the cooling effect on the first heat generating device 501 in real time. Among them, the first heat generating device 5 also includes a plurality of first controllers 504 corresponding to the plurality of first heat generating devices 501 one by one, the detection signal receiving ends of the plurality of first controllers 504 are respectively electrically connected to the detection signal receiving ends of the corresponding first pressure gauges 505 and the detection signal receiving ends of the first temperature gauges 506, and the control signal output ends of the plurality of first controllers 504 are respectively electrically connected to the control ends of the corresponding first electromagnetic expansion valves 502. The pressure data and temperature data of the refrigerant medium respectively detected by the first pressure gauges 505 and the first temperature gauges 506 are transmitted to the first controllers 504. The first controllers 504 can control the on-off state or opening degree of the first electromagnetic expansion valve 502 located upstream of the first heat generating device 501 according to the received pressure data and / or temperature data, and further control the flow rate of the refrigerant medium flowing through the first heat generating device 501.

[0074] In an optional embodiment of the present invention, Figure 1 As shown, a second three-way valve 8 is provided on the main circulation pipeline 28. Along the flow direction of the refrigerant medium in the main circulation pipeline 28, the second three-way valve 8 is located downstream of the first three-way valve 7. One end of the second cooling circuit 30 is connected to the main circulation pipeline 28 through the second three-way valve 8, and the other end of the second cooling circuit 30 is connected to the inlet of the steam-water separator 15 or to the main circulation pipeline 28 near the inlet of the steam-water separator 15. Of course, the other end of the second cooling circuit 30 can also be connected to the other end of the first cooling circuit 29 mentioned above and then connected to the main circulation pipeline 28. When the second heat generating device 6 needs to be cooled, the main circulation pipeline 28 can be connected to the second cooling circuit 30 by controlling the on-off relationship of different interfaces in the second three-way valve 8. At this time, at least part of the refrigerant medium flowing through the first heat exchanger 2 in the main circulation pipeline 28 can flow into the second heat exchanger 9 through the first three-way valve 7, the second three-way valve 8 and the second cooling circuit 30 in sequence, and exchange heat with the second heat generating device 6 through the second heat exchanger 9, thereby using an indirect heat exchange method to perform phase change cooling on the second heat generating device 6, thereby achieving the purpose of cooling the second heat generating device 6.

[0075] Further, such as Figure 1 As shown, along the flow direction of the refrigerant medium in the second cooling circuit 30, a second electromagnetic expansion valve 10 is provided on the second cooling circuit 30 upstream of the second heat exchanger 9. By controlling the on-off state or opening of the second electromagnetic expansion valve 10, the flow rate of the refrigerant medium flowing through the second heat exchanger 9 can be controlled to meet the cooling effect on the second heat generating device 6.

[0076] Further, such as Figure 1 As shown, along the flow direction of the refrigerant medium in the second cooling circuit 30, a second one-way valve 11 for preventing backflow is provided on the second cooling circuit 30 located downstream of the second heat exchanger 9, thereby preventing the refrigerant medium flowing out of the second heat exchanger 9 from flowing back to the second heat exchanger 9.

[0077] Specifically, Figure 1 As shown, the second heat exchanger 9 may be but is not limited to a plate heat exchanger, and the second heat exchanger 9 has a first pipeline and a second pipeline for parallel heat exchange, the second heat exchanger 9 is connected to the second cooling circuit 30 through the first pipeline, and the second heat exchanger 9 is connected to the heat exchange pipeline 31 through the second pipeline, so that the second heat generating device 6 is connected to the second heat exchanger 9 through the heat exchange pipeline 31, and the refrigerant medium flowing through the heat exchange pipeline 31 is heat-exchanged with the refrigerant medium flowing through the second cooling circuit 30 through the second heat exchanger 9, so as to achieve the purpose of cooling the second heat generating device 6.

[0078] Further, such as Figure 1As shown, along the flow direction of the refrigerant medium in the heat exchange pipeline 31, a second circulation pump 12 and a pressure stabilizer 13 are provided on the heat exchange pipeline 31 located upstream of the second heat exchanger 9. The second circulation pump 12 provides a driving force for the cooling medium to flow between the second heat exchanger 9 and the second heat producing device 6, thereby realizing the recycling of the cooling medium between the second heat exchanger 9 and the second heat producing device 6.

[0079] Further, such as Figure 1 As shown, the second heat generating device 6 includes at least two second heat generating devices 601 connected in parallel to the heat exchange pipeline 31, and the pipelines respectively connected to the cooling medium inlets of the two second heat generating devices 601 are connected to the heat exchange pipeline 31 through a third three-way valve 602. By controlling the on-off state and opening degree between different interfaces of the third three-way valve 602, the flow rate of the cooling medium flowing through the two second heat generating devices 601 can be controlled to meet the preset cooling effect.

[0080] In the present invention, the above two second heat generating devices 601 include but are not limited to a hydraulic oil tank for supplying hydraulic oil to the shield machine and a gear oil tank for supplying gear oil to the shield machine. Of course, the second heat generating device 601 can also be a motor and a frequency converter device in the shield machine that needs to be cooled except for the first heat generating device 501.

[0081] In an optional embodiment of the present invention, Figure 1 As shown, at least one first air-cooled evaporator 17 is arranged on the main circulation pipeline 28 and between the first heat exchanger 2 and the steam-water separator 15. Further, along the flow direction of the refrigerant medium in the main circulation pipeline 28, the first air-cooled evaporator 17 is located downstream of the second three-way valve 8, and along the flow direction of the refrigerant medium in the main circulation pipeline 28, a refrigeration solenoid valve 18 and a third electromagnetic expansion valve 19 are sequentially arranged on the main circulation pipeline 28 located upstream of the first air-cooled evaporator 17; in addition, the first air-cooled evaporator 17 is arranged in the ventilation duct of the tunnel. When the space environment (i.e., the tunnel) where the shield machine works needs to be cooled and cooled, at least part of the refrigerant medium flowing through the first heat exchanger 2 can flow into the first air-cooled evaporator 17. In the process of the refrigerant medium flowing through the third electromagnetic expansion valve 19, under the action of the third electromagnetic expansion valve 19, the refrigerant medium evaporates in the first air-cooled evaporator 17, changes phase and absorbs heat, and reduces the wind temperature in the ventilation duct of the tunnel, thereby achieving the purpose of reducing the temperature of the shield underground working environment.

[0082] Further, such as Figure 1 As shown, along the flow direction of the refrigerant medium in the main circulation pipeline 28 , a third one-way valve 20 for preventing backflow is provided on the main circulation pipeline 28 downstream of the first air-cooled evaporator 17 , thereby preventing the refrigerant medium from flowing back to the first air-cooled evaporator 17 .

[0083] Further, such as Figure 1As shown, a second pressure gauge 21 and a second temperature gauge 22 are provided at the outlet of the first air-cooled evaporator 17 or on the main circulation pipeline 28 downstream of the first air-cooled evaporator 17. The pressure of the refrigerant medium output by the first air-cooled evaporator 17 is detected by the second pressure gauge 21, and the temperature of the refrigerant medium output by the first air-cooled evaporator 17 is detected by the second temperature gauge 22, so as to understand the cooling effect on the underground working environment of the shield in real time. Among them, the refrigeration system for the shield machine also includes a second controller 16, a detection signal receiving end of the second controller 16 is electrically connected to the detection signal receiving end of the second pressure gauge 21 and the detection signal receiving end of the second temperature gauge 22, respectively, and the control signal output end of the second controller 16 is electrically connected to the control end of the third electromagnetic expansion valve 19. The pressure data and temperature data of the refrigerant medium detected by the second pressure gauge 21 and the second temperature gauge 22 are transmitted to the second controller 16. The second controller 16 can control the on-off state or opening degree of the third electromagnetic expansion valve 19 and / or the refrigeration solenoid valve 18 located upstream of the first air-cooled evaporator 17 according to the received pressure data and / or temperature data, and thus can control the flow rate of the refrigerant medium flowing through the first air-cooled evaporator 17.

[0084] In an optional embodiment of the present invention, Figure 1 As shown, the refrigeration system for the shield machine also includes a phase change cold storage device 23, which is connected to the main circulation pipeline 28 through a third cooling circuit 32. The phase change cold storage device 23 is connected to the second air-cooled evaporator 24, and the second air-cooled evaporator 24 is arranged in the ventilation duct of the tunnel; a third circulation pump 26 is arranged on the pipeline between the phase change cold storage device 23 and the second air-cooled evaporator 24.

[0085] During the circulation of the refrigerant in the main circulation pipeline 28, at least part of the refrigerant will enter the phase change cold storage device 23 to absorb heat by phase change (i.e., the temperature of the cold storage material in the phase change cold storage device 23 decreases, changing from liquid to solid, storing cold). In the event of a temporary power outage, the refrigerant will absorb cold energy while flowing through the phase change cold storage device 23. Then, the refrigerant that absorbs cold energy evaporates in the second air-cooled evaporator 24 and absorbs heat by phase change, thereby reducing the air temperature in the ventilation duct of the tunnel, thereby achieving the purpose of maintaining the cooling of the shield underground working environment in the event of a power outage. Among them, the phase change cold storage device 23 can be, but is not limited to, a phase change energy storage tank.

[0086] Specifically, Figure 1As shown, a fourth three-way valve 14 is provided on the main circulation pipeline 28 between the first heat exchanger 2 and the first air-cooled evaporator 17, one end of the third cooling circuit 32 is connected to the main circulation pipeline 28 through the fourth three-way valve 14, and the other end of the third cooling circuit 32 is connected to the inlet of the steam-water separator 15 or to the main circulation pipeline 28 near the inlet of the steam-water separator 15. By controlling the on-off relationship of each interface in the fourth three-way valve 14, it is also possible to control whether the refrigerant medium flows through the phase change cold storage device 23. For example, when the phase change cold storage device 23 has stored enough cold, the interface connecting the fourth three-way valve 14 and the phase change cold storage device 23 can be closed, so that the refrigerant medium flows to the first heat producing equipment 5, the second heat producing equipment 6 and / or the first air-cooled evaporator 17, which is used for real-time cooling of the shield equipment and / or the environment.

[0087] Further, such as Figure 1 As shown, along the flow direction of the refrigerant medium in the third cooling circuit 32, a fourth electromagnetic expansion valve 25 is provided on the third cooling circuit 32 located upstream of the phase change cold storage device 23, and a fourth one-way valve 27 for preventing backflow is provided on the third cooling circuit 32 located downstream of the phase change cold storage device 23.

[0088] The working process of the present invention is as follows: when the equipment and / or the tunnel environment in the shield machine need to be cooled, the compressor 4 is started, and the compressor 4 works to make the refrigerant medium in the main circulation pipeline 28 flow through the first heat exchanger 2. In this process, the first heat exchanger 2 performs heat exchange and cooling on the refrigerant medium in the main circulation pipeline 28. By controlling the on-off state of the corresponding interfaces in the first three-way valve 7 and the second three-way valve 8, the refrigerant medium can be controlled to flow to the first heat generating device 5 (motor, inverter, etc.) and / or the second heat generating device 6 (hydraulic oil tank, gear oil tank, etc.); when the first heat generating device 5 with a high heat generating rate needs to be cooled, the first three-way valve 7 is controlled to be opened. The corresponding interfaces of valve 7 and the first electromagnetic expansion valve 502 are opened, and the refrigerant medium evaporates and changes phase inside the first electromagnetic expansion valve 502 to absorb heat. Then, the refrigerant medium can achieve the purpose of cooling down in the process of flowing through the first heat generating device 5. The cooling medium after the phase change will flow into the steam-water separator 15, and the steam-water separator 15 will separate the cooling medium into gaseous cooling medium and liquid cooling medium. The separated gaseous cooling medium is re-compressed into liquid by the compressor 4 and continues to circulate in the main circulation pipeline 28. The separated liquid cooling medium directly flows into the compressor 4 to complete a circulation of the cooling medium. When the second heat generating device 6 with a low heat generating rate needs to be cooled, the corresponding interfaces of the second three-way valve 8 and the second electromagnetic expansion valve 10 are controlled to be opened, and the refrigerant medium undergoes a phase change of evaporation inside the second electromagnetic expansion valve 10 to absorb heat. Then, the refrigerant medium flows through the second heat exchanger 9, and indirectly exchanges heat with the second heat generating device 6 through the second heat exchanger 9 to achieve the purpose of cooling. The cooling medium will also flow into the steam-water separator 15, and the steam-water separator 15 separates the cooling medium into a gaseous cooling medium and a liquid cooling medium. The separated gaseous cooling medium is re-compressed into a liquid by the compressor 4 and continues to circulate in the main circulation pipeline 28. The separated liquid cooling medium directly flows into the compressor 4 to complete a circulation of the cooling medium.

[0089] When the tunnel space environment needs to be cooled, the cooling medium flowing out of the first heat exchanger 2 flows to the first air-cooled evaporator 17 after passing through the fourth three-way valve 14. A plurality of first air-cooled evaporators 17 can be provided. The plurality of first air-cooled evaporators 17 are arranged in the ventilation duct of the tunnel. Under the action of the third electromagnetic expansion valve 19, the cooling medium evaporates in the first air-cooled evaporator 17 and absorbs heat through phase change, thereby reducing the wind temperature in the ventilation duct of the tunnel and achieving the purpose of reducing the temperature of the underground working environment of the shield.

[0090] During the circulation of the above-mentioned refrigerant medium in the main circulation pipeline 28, at least part of the refrigerant medium will enter the phase change cold storage device 23 to undergo phase change and absorb heat. When a temporary power outage occurs, the refrigerant medium will absorb cold energy while flowing through the phase change cold storage device 23. The absorbed cold refrigerant medium will then evaporate in the second air-cooled evaporator 24 and undergo phase change to absorb heat, thereby reducing the wind temperature in the ventilation duct of the tunnel, thereby achieving the purpose of continuing to maintain the cooling of the underground working environment of the shield in the event of a power outage.

[0091] In the present invention, the cooling of the tunnel environment and the cooling of each device in the shield machine can be performed separately or synchronously, thereby achieving the purpose of convenient integrated thermal management.

[0092] The characteristics and advantages of the refrigeration system for a shield machine of the present invention are:

[0093] 1. The refrigeration system for the shield machine adopts a direct phase change cooling heat exchange method for cooling high heat production rate equipment (i.e., the first heat production device 501 mentioned above); and adopts an indirect phase change cooling heat exchange method for cooling low heat production rate equipment (i.e., the second heat production device 601 mentioned above). A hierarchical cooling management is adopted between different equipment to improve the cooling efficiency of the equipment, thereby achieving a good cooling effect for each equipment in the shield machine in a special tunnel environment, thereby ensuring the safe and stable working state of the shield machine.

[0094] Second, the refrigeration system for the shield machine couples the cooling of each device in the shield machine with the cooling of the tunnel environment, which can perform integrated thermal management and facilitate intelligent management.

[0095] 3. The refrigeration system for the shield machine is additionally provided with a phase-change cold storage device 23. Under normal working conditions, the phase-change cold storage device 23 can maintain the maximum cold storage capacity. In the event of a temporary power outage, the cold capacity stored in the phase-change cold storage device 23 can be used to continue to supply cooling to the tunnel environment, thereby ensuring a working environment for maintenance personnel in a maintenance state and ensuring the safety of the work.

[0096] Implementation Method 2

[0097] The present invention provides a shield machine, which comprises the above-mentioned refrigeration system for the shield machine.

[0098] The shield machine of the present invention has the characteristics and advantages of the above-mentioned refrigeration system for the shield machine, which will not be described in detail here.

[0099] It should be noted that, in the description of this application, the terms "first", "second", etc. are only used for descriptive purposes and to distinguish similar objects. There is no order of precedence between the two, and they cannot be understood as indicating or implying relative importance. In addition, in the description of this application, unless otherwise specified, the meaning of "plurality" is two or more.

[0100] The above-mentioned various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other. Each embodiment focuses on the differences from other embodiments.

[0101] The above are only a few embodiments of the present invention. Although the embodiments disclosed by the present invention are as above, the contents are only embodiments adopted for facilitating the understanding of the present invention and are not used to limit the present invention. Any technician in the technical field to which the present invention belongs can make any modification and change in the form and details of the embodiments without departing from the spirit and scope disclosed by the present invention, but the patent protection scope of the present invention shall still be subject to the scope defined by the attached claims.

Claims

1. A refrigeration system for a shield machine, characterized in that: include: A first heat exchanger (2), the first heat exchanger (2) being used for exchanging heat with the water cooling device (1); A main circulation pipeline (28) for a refrigerant medium to flow through, wherein a compressor (4), the first heat exchanger (2) and a steam-water separator (15) are sequentially arranged on the main circulation pipeline (28) along the flow direction of the refrigerant medium, and the compressor (4), the first heat exchanger (2) and the steam-water separator (15) are connected end to end through the main circulation pipeline (28) to form a circulatory annular flow path; The main circulation pipeline (28) is connected to a first cooling circuit (29) and a second cooling circuit (30) in parallel, the first cooling circuit (29) is provided with at least one first heat generating device (5), the second cooling circuit (30) is provided with at least one second heat generating device (6), and the heat generating rate of the first heat generating device (5) is greater than the heat generating rate of the second heat generating device (6).

2. The refrigeration system for a shield machine according to claim 1, characterized in that: Along the flow direction of the refrigerant medium, the first cooling circuit (29) is connected to the main circulation pipeline (28) downstream of the first heat exchanger (2), and the second cooling circuit (30) is connected to the main circulation pipeline (28) downstream of the first heat exchanger (2). The second cooling circuit (30) is provided with a second heat exchanger (9), and the second heat exchanger (9) is connected to the second heat generating device (6). The second heat exchanger (9) is used to exchange heat with the second heat generating device (6).

3. The refrigeration system for a shield machine according to claim 2, characterized in that: The water cooling device (1) comprises a cooling tower, a first pipeline in the first heat exchanger (2) through which a cooling medium flows is connected to the cooling tower, and a first circulation pump (3) is provided between the first heat exchanger (2) and the cooling tower so that the cooling medium circulates between the first heat exchanger (2) and the cooling tower.

4. The refrigeration system for a shield machine according to claim 2, characterized in that: A first three-way valve (7) is provided on the main circulation pipeline (28); one end of the first cooling circuit (29) is connected to the main circulation pipeline (28) via the first three-way valve (7); the other end of the first cooling circuit (29) is connected to the inlet of the steam-water separator (15) or to the main circulation pipeline (28) near the inlet of the steam-water separator (15).

5. The refrigeration system for a shield machine according to claim 4, characterized in that: The first heat generating device (5) comprises a plurality of first heat generating devices (501) connected in parallel to the first cooling circuit (29); first electromagnetic expansion valves (502) are respectively provided on cooling medium inlets of the plurality of first heat generating devices (501) or on pipelines connected to the cooling medium inlets of the first heat generating devices (501); first check valves (503) for preventing backflow are respectively provided on cooling medium outlets of the plurality of first heat generating devices (501) or on pipelines connected to the cooling medium outlets of the first heat generating devices (501); Among them, the plurality of first heat generating devices (501) include a motor and a frequency converter for controlling the operation of the shield machine.

6. The refrigeration system for a shield machine according to claim 2, characterized in that: A second three-way valve (8) is provided on the main circulation pipeline (28); one end of the second cooling circuit (30) is connected to the main circulation pipeline (28) via the second three-way valve (8); the other end of the second cooling circuit (30) is connected to the inlet of the steam-water separator (15) or to the main circulation pipeline (28) near the inlet of the steam-water separator (15).

7. The refrigeration system for a shield machine according to claim 6, characterized in that: A second electromagnetic expansion valve (10) is provided on the second cooling circuit (30) upstream of the second heat exchanger (9) along the flow direction of the refrigerant medium in the second cooling circuit (30); And / or, a second one-way valve (11) for preventing backflow is provided on the second cooling circuit (30) located downstream of the second heat exchanger (9).

8. The refrigeration system for a shield machine according to claim 6 or 7, characterized in that: The second heat generating device (6) is connected to the second heat exchanger (9) via a heat exchange pipeline (31), and the second heat exchanger (9) exchanges heat between the refrigerant medium flowing through the heat exchange pipeline (31) and the refrigerant medium flowing through the second cooling circuit (30); A second circulation pump (12) and a pressure stabilizer (13) are provided on the heat exchange pipeline (31) located upstream of the second heat exchanger (9).

9. The refrigeration system for a shield machine according to claim 8, characterized in that: The second heat generating device (6) comprises at least two second heat generating devices (601) connected in parallel to the heat exchange pipeline (31), and pipelines respectively connected to the cooling medium inlets of the two second heat generating devices (601) are connected to the heat exchange pipeline (31) via a third three-way valve (602); The two second heat generating devices (601) include a hydraulic oil tank for supplying hydraulic oil to the shield machine and a gear oil tank for supplying gear oil to the shield machine.

10. The refrigeration system for a shield machine according to claim 1, characterized in that: At least one first air-cooled evaporator (17) is arranged on the main circulation pipeline (28) and between the first heat exchanger (2) and the steam-water separator (15), and the first air-cooled evaporator (17) is arranged in the ventilation duct of the tunnel; Along the flow direction of the refrigerant medium in the main circulation pipeline (28), a refrigeration solenoid valve (18) and a third solenoid expansion valve (19) are sequentially arranged on the main circulation pipeline (28) upstream of the first air-cooled evaporator (17), and a third one-way valve (20) for preventing backflow is arranged on the main circulation pipeline (28) downstream of the first air-cooled evaporator (17).

11. The refrigeration system for a shield machine according to claim 10, characterized in that: The refrigeration system for the shield machine further comprises a phase-change cold storage device (23), wherein the phase-change cold storage device (23) is connected to the main circulation pipeline (28) via a third cooling circuit (32), and the phase-change cold storage device (23) is connected to a second air-cooled evaporator (24), and the second air-cooled evaporator (24) is arranged in a ventilation duct of the tunnel; A third circulation pump (26) is provided on the pipeline between the phase-change cold storage device (23) and the second air-cooled evaporator (24).

12. The refrigeration system for a shield machine according to claim 11, characterized in that: A fourth three-way valve (14) is provided on the main circulation pipeline (28) between the first heat exchanger (2) and the first air-cooled evaporator (17); one end of the third cooling circuit (32) is connected to the main circulation pipeline (28) via the fourth three-way valve (14); the other end of the third cooling circuit (32) is connected to the inlet of the steam-water separator (15) or to the main circulation pipeline (28) near the inlet of the steam-water separator (15); Along the flow direction of the refrigerant medium in the third cooling circuit (32), a fourth electromagnetic expansion valve (25) is provided on the third cooling circuit (32) located upstream of the phase change cold storage device (23), and a fourth one-way valve (27) for preventing backflow is provided on the third cooling circuit (32) located downstream of the phase change cold storage device (23).

13. A shield machine, characterized in that: The shield machine comprises the refrigeration system for a shield machine according to any one of claims 1 to 12.

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