CN219141193U

CN219141193U - Novel shield constructs quick-witted liquid nitrogen refrigerating system

Info

Publication number: CN219141193U
Application number: CN202223456431.8U
Authority: CN
Inventors: 陈军浩; 连立锦
Original assignee: Fujian University of Technology
Current assignee: Fujian University of Technology
Priority date: 2022-12-23
Filing date: 2022-12-23
Publication date: 2023-06-06
Anticipated expiration: 2032-12-23

Abstract

The utility model relates to the technical field of shield machine construction, in particular to a novel shield machine liquid nitrogen refrigerating system, which comprises a shield machine cutter head, a shield machine shell, a liquid nitrogen storage chamber, a pressurizing chamber and a pressure control chamber, wherein one side of the liquid nitrogen storage chamber is communicated with a liquid nitrogen filling mechanism, the other side of the liquid nitrogen storage chamber is communicated with a connecting pipe, the other end of the connecting pipe is communicated with an inlet of the pressurizing chamber, and a first valve is arranged on the surface of the connecting pipe; according to the utility model, in the use process, the liquid nitrogen is pressurized and then is conveyed to the rectangular freezing pipe to freeze the soil body at the end of the shield machine, so that the soil body is reinforced, the combination of a liquid nitrogen refrigerating system and the shield machine is more convenient and faster, the operability is strong, the freezing and reinforcing mode has good water stopping performance, the surrounding soil body is not disturbed, and the liquid nitrogen circulating system is arranged in the system, so that the utilization rate of liquid nitrogen is improved, the cooling efficiency is higher, and the system is quite economical.

Description

Novel shield constructs quick-witted liquid nitrogen refrigerating system

Technical Field

The utility model relates to the technical field of shield machine construction, in particular to a novel liquid nitrogen refrigerating system of a shield machine.

Background

The shield tunneling machine is a tunnel tunneling machine using a shield tunneling method. The construction method of the shield is that the tunneling machine constructs (lays) a "shield" (which refers to a supporting segment) of a tunnel while tunneling, and is different from the open construction method. The shield method is a mainstream subway construction method at present, and is applied to the construction of most subway tunnels. The shield method is used for excavating and lining in the underground rock-soil body by utilizing a shield machine, and the automatic operation can be realized. However, some problems are easy to occur in the shield process, such as water gushing in the shield starting process, overlarge ground deformation caused by bad stratum shield, water seepage, collapse and other conditions easily occur in the construction site, and the construction process is seriously influenced. In order to solve the problems of overlarge stratum water yield, stratum subsidence and the like in the shield process, a novel liquid nitrogen refrigerating system of a shield machine is provided, and the system is matched with the shield machine for use, so that the problems can be solved, the purpose of stopping water and reinforcing the stratum is achieved, and further the smooth progress of the shield is realized.

Disclosure of Invention

The utility model aims to provide a novel liquid nitrogen refrigerating system of a shield machine, which utilizes liquid nitrogen to freeze to strengthen soil body at the end of the shield machine, has good water stopping performance in a freezing and strengthening mode and has no disturbance to surrounding soil bodies.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides a novel shield constructs quick-witted liquid nitrogen refrigerating system, includes shield constructs quick-witted blade disc, shield constructs quick-witted shell, liquid nitrogen apotheca, pressurization room and pressure control room, one side intercommunication of liquid nitrogen apotheca is provided with liquid nitrogen filling mechanism, the opposite side intercommunication of liquid nitrogen apotheca is provided with the connecting tube, the other end of connecting tube communicates with the entry of pressurization room each other, the surface mounting of connecting tube has first valve, the export intercommunication of pressurization room has liquid nitrogen to go the way pipe, the surface mounting of liquid nitrogen to go the way pipe has the second valve, one side of shield constructs quick-witted blade disc is fixed with the rectangle and freezes the pipe, the surface of rectangle freezes the pipe still is provided with the heat preservation material layer, the one end of rectangle freezes the pipe and the liquid nitrogen to go the way pipe intercommunication each other, the other end intercommunication of rectangle freezes the pipe is provided with liquid nitrogen return pipe, the export of liquid nitrogen return pipe communicates with the entry of pressure control room each other, the export intercommunication of pressure control room has first siphunculus, the other end intercommunication of first siphunculus has the gas-liquid separation room, the export intercommunication of gas-liquid separation room has the second siphunculus, the export intercommunication of second siphunculus has the cooling chamber, the cooling room has the intercommunication of the opposite side, the other side.

Preferably, the surface of the pressurizing chamber is provided with a first thermometer, a first pressure gauge and a first flow rate gauge respectively, and the surface of the pressure control chamber is provided with a second thermometer and a second pressure gauge respectively.

Preferably, the models of the first pressure gauge and the second pressure gauge are CYJ-1, and the models of the first temperature gauge and the second temperature gauge are DTM-280.

Preferably, the liquid nitrogen filling mechanism comprises a liquid nitrogen filling pipe, a third valve, a liquid nitrogen filling port and a sealing cover, one end of the liquid nitrogen filling pipe is communicated with the liquid nitrogen storage chamber, the liquid nitrogen filling port is arranged at the other end of the liquid nitrogen filling pipe, the third valve is arranged on the surface of the liquid nitrogen filling pipe, and the sealing cover is hinged with the liquid nitrogen filling port.

Preferably, a magnet is embedded below the surface of one side of the liquid nitrogen filling port, the sealing cover is made of metal, and a poking plate is fixed on one side of the sealing cover.

Preferably, the surface of the liquid nitrogen storage chamber is also provided with a liquid level display window, and the surface of the liquid level display window is provided with liquid level scale marks.

Preferably, the materials of the first through pipe and the second through pipe are heat insulation materials, and the materials of the return pipe are heat insulation materials.

Preferably, the specification of the first valve is the same as that of the second valve, and the models of the first valve and the second valve are DZ41.

Preferably, the thickness of the heat-insulating material layer is larger than that of the wall of the rectangular freezing pipe, and the heat-insulating material layer is made of phenolic foam heat-insulating pipe shell material.

Compared with the prior art, the utility model has the following beneficial effects:

according to the utility model, in the use process, the liquid nitrogen is pressurized and then is conveyed to the rectangular freezing pipe to freeze the soil body at the end of the shield machine, so that the soil body is reinforced, the combination of a liquid nitrogen refrigerating system and the shield machine is more convenient and faster, the operability is strong, the freezing and reinforcing mode has good water stopping performance, the surrounding soil body is not disturbed, and the liquid nitrogen circulating system is arranged in the system, so that the utilization rate of liquid nitrogen is improved, the cooling efficiency is higher, and the system is quite economical.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a cross-sectional view taken along the direction 1-1 of FIG. 1 in accordance with the present utility model;

FIG. 3 is a cross-sectional view taken along the direction 2-2 in FIG. 2 in accordance with the present utility model;

fig. 4 is an enlarged schematic view of the structure of fig. 1 a according to the present utility model.

In the figure: 1. cutter head of shield machine; 2. a shield machine shell; 3. a liquid nitrogen storage chamber; 4. a liquid nitrogen filling mechanism; 401. a liquid nitrogen filling pipe; 402. a third valve; 403. a liquid nitrogen filling port; 404. sealing cover; 405. a magnet; 406. a poking plate; 5. a connecting pipe; 6. a first valve; 7. a pressurizing chamber; 8. a first thermometer; 9. a first pressure gauge; 10. a first flow rate meter; 11. liquid nitrogen outgoing line; 12. a second valve; 13. rectangular freezing pipes; 14. a layer of thermal insulation material; 15. a liquid nitrogen loop pipe; 16. a pressure control chamber; 17. a second thermometer; 18. a second pressure gauge; 19. a first through pipe; 20. a gas-liquid separation chamber; 21. a second through pipe; 22. a cooling chamber; 23. a return pipe; 24. and a liquid level display window.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1-4, a novel shield machine liquid nitrogen refrigerating system comprises a shield machine cutterhead 1, a shield machine shell 2, a liquid nitrogen storage chamber 3, a pressurizing chamber 7 and a pressure control chamber 16, wherein one side of the liquid nitrogen storage chamber 3 is communicated with a liquid nitrogen filling mechanism 4, the other side of the liquid nitrogen storage chamber 3 is communicated with a connecting pipe 5, the other end of the connecting pipe 5 is communicated with an inlet of the pressurizing chamber 7, a first valve 6 is arranged on the surface of the connecting pipe 5, the opening and closing of the connecting pipe 5 can be controlled by the first valve 6, a liquid nitrogen outgoing pipe 11 is communicated with an outlet of the pressurizing chamber 7, a second valve 12 is arranged on the surface of the liquid nitrogen outgoing pipe 11, the specification of the first valve 6 is identical with that of the second valve 12, the types of the first valve 6 and the second valve 12 are DZ41, the valves of the type DZ41 are low-temperature flange gate valves which can be suitable for low-temperature mediums such as methane, liquid natural gas, methylene, carbon dioxide, liquid ammonia, liquid oxygen, liquid nitrogen, liquid hydrogen and the like, therefore, when the system is used, the first valve 6 and the second valve 12 have the function of resisting low temperature, one side of the shield tunneling machine cutterhead 1 is fixed with a rectangular freezing pipe 13, the surface of the rectangular freezing pipe 13 is also provided with a heat insulation material layer 14, the thickness of the heat insulation material layer 14 is larger than that of the wall of the rectangular freezing pipe 13, the heat insulation material layer 14 made of phenolic foam heat insulation pipe shell materials can resist low temperature of-250 ℃, the heat insulation performance is good, the fire resistance and the aging resistance are high, the heat insulation material layer 14 can insulate the rectangular freezing pipe 13, the heat exchange between the rectangular freezing pipe 13 and air or soil layers is prevented, the temperature of liquid nitrogen is prevented from rising, as shown in figure 3, one side of the rectangular freezing pipe 13 close to the shield tunneling machine shell 2 is not provided with the heat insulation material layer 14, this one side can be used for exchanging heat with the soil layer, the one end and the liquid nitrogen of rectangle freeze pipe 13 go the way pipe 11 intercommunication, the other end intercommunication of rectangle freeze pipe 13 is provided with liquid nitrogen return pipe 15, the export of liquid nitrogen return pipe 15 communicates with the entry of pressure control room 16 each other, the export intercommunication of pressure control room 16 has first siphunculus 19, the other end intercommunication of first siphunculus 19 has gas-liquid separation room 20, gas-liquid separation room 20 export intercommunication has second siphunculus 21, the export intercommunication of second siphunculus 21 has cooling chamber 22, the material of first siphunculus 19 and second siphunculus 21 is the heat preservation material, the opposite side intercommunication of cooling chamber 22 has return pipe 23, and the other end and the liquid nitrogen bin 3 intercommunication of return pipe 23 are the heat preservation material, prevent that liquid nitrogen that flows in the return pipe 23 from exchanging heat with the external world and causing the temperature to rise, the heat preservation material is phenolic foam heat preservation material also, this system is through carrying out the soil body that freezes the shield machine end through carrying out the rectangle freeze after with the pressurization in the use shell, consolidate the liquid nitrogen, it is more convenient and fast to adopt liquid nitrogen system and machine to consolidate, the machine, the operation is good, moreover, the system is cooled down in addition, the system is very high is cooled down, the system is not disturbed in the water economy, and is cooled down, the system is not had.

The surface of the pressurizing chamber 7 is respectively provided with a first thermometer 8, a first pressure gauge 9 and a first flow rate gauge 10, the first thermometer 8 can monitor the temperature of liquid nitrogen entering the pressurizing chamber 7, meanwhile, the first pressure gauge 9 can monitor the pressure of the liquid nitrogen in the pressurizing chamber 7, the first flow rate gauge 10 can monitor the flow rate of the liquid nitrogen, the data such as the temperature, the pressure, the flow rate and the like of the liquid nitrogen are fed back, so that workers can acquire the data in real time, the surface of the pressure control chamber 16 is respectively provided with a second thermometer 17 and a second pressure gauge 18, the second thermometer 17 can monitor the temperature of the backflow liquid nitrogen, the second pressure gauge 18 can monitor the pressure of the backflow liquid nitrogen, the first pressure gauge 9 and the second pressure gauge 18 are all in the form of CYJ-1, the pressure gauge which can operate in a low-temperature environment and can effectively resist the low temperature of the liquid nitrogen, the first thermometer 8 and the second thermometer 17 are in the form of DTM-280, and the temperature gauge which is in the form of DTM-280 can operate in the low-temperature environment.

The liquid nitrogen filling mechanism 4 comprises a liquid nitrogen filling pipe 401, a third valve 402, a liquid nitrogen filling port 403 and a sealing cover 404, one end of the liquid nitrogen filling pipe 401 is communicated with the liquid nitrogen storage chamber 3, the liquid nitrogen filling port 403 is arranged at the other end of the liquid nitrogen filling pipe 401, the third valve 402 is arranged on the surface of the liquid nitrogen filling pipe 401 and used for controlling the opening and closing of the liquid nitrogen filling pipe 401, the sealing cover 404 is hinged with the liquid nitrogen filling port 403, the third valve 402 and the sealing cover 404 are opened, liquid nitrogen can be filled into the liquid nitrogen storage chamber 3 through the liquid nitrogen filling port 403, after filling is finished, the third valve 402 is closed, the sealing cover 404 is closed, dust can be prevented from entering the liquid nitrogen filling port 403, in order to enable the sealing cover 404 and the liquid nitrogen filling port 403 to be mutually fixed, a magnet 405 is embedded below one side surface of the liquid nitrogen filling port 403, the sealing cover 404 is made of metal, after the sealing cover 404 is closed, the magnet 405 can adsorb the sealing cover 404, the sealing effect of the liquid nitrogen filling port 403 is improved, a stirring plate 406 is fixed on one side of the sealing cover 404, the sealing cover 404 can be used for filling liquid nitrogen into the liquid nitrogen storage chamber 3, a liquid level display window 24 is arranged on the surface of the liquid nitrogen storage chamber for conveniently displaying the liquid level, and the liquid level display window 24 is arranged on the surface of the liquid level display chamber conveniently.

Working principle: firstly, the third valve 402 and the sealing cover 404 are opened, enough liquid nitrogen can be filled into the liquid nitrogen storage chamber 3 through the liquid nitrogen filling opening 403, after filling, the third valve 402 is closed, the sealing cover 404 is closed at the same time, when in operation, the first valve 6 is opened, the liquid nitrogen in the liquid nitrogen storage chamber 3 enters the inside of the pressurizing chamber 7 through the connecting pipe 5, after the liquid nitrogen is pressurized, the second valve 12 is opened at the same time, the pressurized liquid nitrogen enters the liquid nitrogen outlet pipe 11, during the pressurizing process, the data of the temperature, the pressure, the flow rate and the like of the liquid nitrogen are monitored through the first thermometer 8, the first manometer 9 and the first flowmeter 10, then the liquid nitrogen enters the rectangular freezing pipe 13, the pressure and the flow rate of the liquid nitrogen are controlled through the pressurizing chamber 7, the liquid nitrogen passes through the rectangular freezing pipe 13 to exchange heat with surrounding soil, the surrounding soil is cooled and frozen, therefore, the effect of water stopping is achieved, the liquid nitrogen subjected to heat exchange enters the pressure control chamber 16 through the liquid nitrogen loop pipe 15, the pressure control chamber 16 can display the temperature and control pressure of the liquid nitrogen at the moment so that the liquid nitrogen can finish the subsequent circulation, then the liquid nitrogen discharged from the pressure control chamber 16 enters the gas-liquid separation chamber 20 through the first through pipe 19, and as the temperature of the liquid nitrogen can rise after the liquid nitrogen is subjected to heat exchange with soil through the rectangular freezing pipe 13, part of the liquid nitrogen can be directly gasified, gas is directly discharged through the gas-liquid separation chamber 20, meanwhile, the liquid nitrogen enters the cooling chamber 22 from the second through pipe 21, and the liquid nitrogen subjected to cooling again returns to the liquid nitrogen storage chamber 3 through the return pipe 23 so as to be recycled.

Liquid nitrogen refers to liquid nitrogen. Liquid nitrogen is inert, colorless, odorless, noncorrosive, nonflammable and extremely low-temperature liquid, and a large amount of heat absorption contacts during vaporization to cause frostbite. Nitrogen constitutes a large part of the atmosphere (volume ratio 78.03%, weight ratio 75.5%). Nitrogen has a boiling point of-196.56 ℃ at normal pressure, and 1 cubic meter of liquid nitrogen can be expanded to 696 cubic meters of pure gaseous nitrogen (21 ℃). If pressurized, liquid nitrogen can be obtained at a higher temperature. In industry, liquid nitrogen is obtained by air fractionation. The air is purified and liquefied in pressurized and cooled environment, and the components with different boiling points are separated. The direct contact of human skin with liquid nitrogen is no problem at the moment, and the human skin is frostbite and irreversible only after 2 seconds.

It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a novel shield constructs quick-witted liquid nitrogen refrigerating system, includes shield constructs quick-witted blade disc (1), shield constructs quick-witted shell (2), liquid nitrogen apotheca (3), pressurization room (7) and pressure control room (16), its characterized in that: one side intercommunication of liquid nitrogen bin (3) is provided with liquid nitrogen filling mechanism (4), the opposite side intercommunication of liquid nitrogen bin (3) is provided with connecting pipe (5), the other end of connecting pipe (5) communicates with the entry of pressurization room (7) each other, the surface mounting of connecting pipe (5) has first valve (6), the export intercommunication of pressurization room (7) has liquid nitrogen to go pipeline (11), the surface mounting of liquid nitrogen to go pipeline (11) has second valve (12), one side of shield constructs quick-witted blade disc (1) is fixed with rectangle freeze pipe (13), the surface of rectangle freeze pipe (13) still is provided with heat preservation material layer (14), the one end and the liquid nitrogen to go pipeline (11) intercommunication, the other end intercommunication of rectangle freeze pipe (13) is provided with liquid nitrogen return pipe (15), the export of liquid nitrogen return pipe (15) communicates with the entry of pressure control room (16) each other, the export intercommunication of pressure control room (16) has first siphunculus (19), the one side is fixed with rectangle freeze pipe (13), the surface of rectangle freeze pipe (13) still is provided with heat preservation material layer (14), the export of the second siphunculus (20) intercommunication of the other end (20), the second siphunculus (20) has the cooling room (22), and the other end of the return pipe (23) is communicated with the liquid nitrogen storage chamber (3).

2. The novel shield tunneling machine liquid nitrogen refrigerating system according to claim 1, wherein: the surface of pressurization room (7) is provided with first thermometer (8), first manometer (9) and first flowmeter (10) respectively, the surface of pressure control room (16) is provided with second thermometer (17) and second manometer (18) respectively.

3. The novel shield tunneling machine liquid nitrogen refrigerating system according to claim 2, wherein: the models of the first pressure gauge (9) and the second pressure gauge (18) are CYJ-1, and the models of the first thermometer (8) and the second thermometer (17) are DTM-280.

4. The novel shield tunneling machine liquid nitrogen refrigerating system according to claim 1, wherein: the liquid nitrogen filling mechanism (4) comprises a liquid nitrogen filling pipe (401), a third valve (402), a liquid nitrogen filling port (403) and a sealing cover (404), wherein one end of the liquid nitrogen filling pipe (401) is communicated with the liquid nitrogen storage chamber (3), the liquid nitrogen filling port (403) is arranged at the other end of the liquid nitrogen filling pipe (401), the third valve (402) is arranged on the surface of the liquid nitrogen filling pipe (401), and the sealing cover (404) is hinged with the liquid nitrogen filling port (403).

5. The novel shield tunneling machine liquid nitrogen refrigerating system according to claim 4, wherein: the magnet (405) is embedded below one side surface of the liquid nitrogen filling port (403), the sealing cover (404) is made of metal, and a poking plate (406) is fixed on one side of the sealing cover (404).

6. The novel shield tunneling machine liquid nitrogen refrigerating system according to claim 1, wherein: the liquid nitrogen storage device is characterized in that a liquid level display window (24) is further arranged on the surface of the liquid nitrogen storage chamber (3), and liquid level scale marks are arranged on the surface of the liquid level display window (24).

7. The novel shield tunneling machine liquid nitrogen refrigerating system according to claim 1, wherein: the material of first siphunculus (19) and second through-pipe (21) is heat preservation material, the material of return tube (23) is heat preservation material.

8. The novel shield tunneling machine liquid nitrogen refrigerating system according to claim 1, wherein: the specification of the first valve (6) is the same as that of the second valve (12), and the types of the first valve (6) and the second valve (12) are DZ41.

9. The novel shield tunneling machine liquid nitrogen refrigerating system according to claim 1, wherein: the thickness of the heat insulation material layer (14) is larger than that of the wall of the rectangular freezing pipe (13), and the heat insulation material layer (14) is made of phenolic foam heat insulation pipe shell material.