Closed internal circulation cooling water system of shield tunneling machine and tunneling equipment with closed internal circulation cooling water system

Abstract

The invention discloses a closed internal circulation cooling water system of a shield tunneling machine and tunneling equipment with the closed internal circulation cooling water system. Comprising a balanced reservoir communicated with the atmosphere, a to-be-cooled device set arranged on the shield tunneling machine and to be subjected to water cooling, an internal circulating water pump used for supplying pumping pressure, internal and external water radiators used for cooling internal circulating water and external circulating water, and a pipeline system playing a connecting role. And the internal circulating water pump, the to-be-cooled device group and the internal and external water radiators are sequentially communicated end to end through a pipeline system to form a closed water circulating loop. The balanced reservoir is located at the highest point of the arrangement position of the closed internal circulation cooling water system and connected with the lowest pressure point in the closed water circulation loop through the pipeline system. According to the system, the problem that cooling water flow distribution cannot meet the heat dissipation requirement due to different heights of cooling branches can be solved, a high-lift water pump is not needed under the large height difference working condition, full-water operation can be achieved, and the balanced reservoir can conduct pressure fixing, water supplementing and air exhausting on the system.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel boring equipment, and in particular, to a shield machine closed internal circulation cooling water system. In addition, the present invention also relates to a tunnel boring equipment comprising the shield machine closed internal circulation cooling water system. Background Art

[0002] During the tunneling process of the shield machine, the equipment in the hydraulic system, main drive and power distribution system will generate a lot of heat. In order to avoid the system equipment temperature being too high and affecting the construction process, the generated heat needs to be taken away in time. At present, in the field of tunneling equipment technology, cooling circulating water systems are mostly used to cool the heat-generating equipment, including internal circulation cooling water systems and external circulation cooling water systems. Among them, the internal circulation water is pressurized by a water pump to cool the heat-generating equipment, and the external circulation water is used to cool the internal circulation water and equipment water, grouting and cleaning and other industrial water systems. Having a safe and reliable cooling circulating water system is a prerequisite for ensuring the normal operation of the shield machine.

[0003] At present, the circulating water system of most shield machines basically adopts an open system. The open system requires a large water tank. When the diameter of the shield machine is large or there is a small slope during excavation, there is a backflow of the highest water when the system is shut down, the water tank overflows, the system is not full of water, there are bubbles when the system is running, and the head required by the water pump also changes with the height difference, resulting in a waste of resources, such as patents CN209855789U and CN109209415B.

[0004] At present, closed systems are mostly used in the fields of high-rise water supply, HVAC, water supply and drainage, and power plant cooling. There have also been cases of using balancing water tanks to achieve the system's constant pressure and exhaust functions. However, there are significant differences from tunnel equipment such as tunnel boring machines. The closed system is applied to tunneling equipment, which has its own particularity and technical difficulty. On the one hand, there are space limitations, and on the other hand, there are flow distribution and cooling system exhaust when there are multiple cooling branches at different heights. Therefore, the water system design experience in other fields cannot be completely copied. At present, there are few closed system design patents for tunnel boring machine cooling water circulation systems, such as patent CN220454035U: Provides a closed cooling circulating water system for TBMs with large slopes, including an external circulating water system, a water replenishment device, an air supply device, a closed internal circulating water pump station, a cooling system, a control panel, etc. Although it solves the problems of the influence of different height differences on the water flow distribution of each branch of the cooling system, large throttling losses in the low area, and large height difference backwater impact, its system composition is complex and difficult to operate. Summary of the invention

[0005] The present invention provides a closed internal circulation cooling water system for a shield machine and a tunnel boring device having the same, so as to solve the problems existing in an open system, such as a large required water tank volume, easy backflow of the highest level water when the system is shut down, water tank overflow, the system running without full water, bubbles when the system is running, and the required head of the water pump also changing with the height difference, resulting in waste of resources, and the technical problems existing in the existing closed system, such as complex composition and difficult operation.

[0006] The technical solution adopted by the present invention is as follows:

[0007] A closed internal circulation cooling water system for a shield machine comprises: a balancing water tank connected to the atmosphere, a waiting-to-be-cooled device group arranged in the shield machine to be water-cooled, an internal circulation water pump for supplying pumping pressure, internal and external water radiators for dissipating heat of internal and external circulation water, and a pipe system for connecting; the internal circulation water pump, the waiting-to-be-cooled device group and the internal and external water radiators are connected end to end in sequence through the pipe system to form a closed water circulation loop; the balancing water tank is located at the highest point of the closed internal circulation cooling water system setting position, and is connected to the lowest pressure point in the closed water circulation loop through the pipe system.

[0008] Furthermore, the piping system includes an internal circulation water inlet pipe and a heat dissipation branch pipe; the two ends of the internal circulation water inlet pipe are respectively connected to the water outlet end of the internal circulation water pump and the water inlet end of the group to be cooled; the water inlet end of the heat dissipation branch pipe is connected to the water outlet end of the group to be cooled, the water outlet end of the heat dissipation branch pipe is connected to the water inlet end of the internal circulation water pump, and the internal and external water radiators are connected to the heat dissipation branch pipe; the internal circulation water pump, the group to be cooled and the internal and external water radiators are connected end to end through the internal circulation water inlet pipe and the heat dissipation branch pipe arranged in sequence to form a closed water circulation loop.

[0009] Furthermore, the pipeline system also includes a first water-making up constant-pressure pipe and a second water-making up constant-pressure pipe, a first switch valve arranged in the first water-making up constant-pressure pipe pipeline, and a second switch valve arranged in the second water-making up constant-pressure pipe pipeline; the first end of the first water-making up constant-pressure pipe is connected to the balancing water tank, and its opposite second end is connected to the return water of the cooling branch with the highest position in the cooler group; the first end of the second water-making up constant-pressure pipe is connected to the balancing water tank, and its opposite second end is connected to the water inlet end of the internal circulation water pump.

[0010] Furthermore, the water inlet ends of the first water replenishment constant pressure pipe and the second water replenishment constant pressure pipe merge and are connected to the bottom end of the balancing water tank; the water outlet end of the second water replenishment constant pressure pipe merges with the water outlet end of the heat dissipation branch pipe and is connected to the water inlet end of the internal circulation water pump.

[0011] Furthermore, the closed internal circulation cooling water system of the shield machine also includes a pressure detector for detecting pressure, and a controller connected to the pressure detector; the pressure detector is arranged at the return water of the cooling branch with the highest position in the cooler group; the first switch valve and the second switch valve are both electric switch valves or pneumatic switch valves connected to the controller.

[0012] Furthermore, the cooler group includes a main drive cooler, a gear oil cooler, a hydraulic oil cooler and a transformer cooler which are arranged in parallel in sequence, and the water inlet ends of the four are connected to the water outlet ends of the internal circulation water inlet pipe through branch pipes, and the water outlet ends of the four are connected to the water inlet ends of the heat dissipation branch pipes through branch pipes.

[0013] Furthermore, the cooler group also includes a flow regulating valve arranged in each branch pipe, and the flow regulating valve is connected to the controller.

[0014] Furthermore, the closed internal circulation cooling water system of the shield machine also includes a water replenishment system for replenishing the balancing water tank, and the water replenishment system includes: an external water source for supplying replenishment water, a water replenishment pump for pumping replenishment water, and a water replenishment pipe for guiding replenishment water; both ends of the water replenishment pipe are respectively connected to the external water source and the balancing water tank; the water replenishment pump is connected to the pipeline of the water replenishment pipe.

[0015] Furthermore, the water replenishment system also includes a high liquid level detector and a low liquid level detector which are sequentially arranged in the balance water tank from top to bottom, and the high liquid level detector and the low liquid level detector are respectively connected to the controller; the water replenishment pump is connected to the controller.

[0016] According to another aspect of the present invention, there is also provided a tunnel boring equipment, including a shield machine, wherein the shield machine is provided with a closed internal circulation cooling water system for the shield machine as described in any one of the above items.

[0017] The present invention has the following beneficial effects:

[0018] In the closed internal circulation cooling water system of the present invention, the internal circulation water pump, the to-be-cooled group and the internal and external water radiators are connected end to end in sequence through a pipe system to form a closed water circulation loop. The closed system design is adopted. Since the closed water circulation loop is not connected to the atmosphere, the problem of cooling water flow distribution not meeting the heat dissipation demand caused by the different heights of the cooling branches is avoided (the flow of the cooling branch depends on the pressure difference at both ends of the branch. The open system changes with the change of height, and the branch inlet pressure also changes accordingly. The outlet reflux is connected to an open water tank connected to the atmosphere, and the pressure is always equal to the atmospheric pressure, resulting in a higher height and a smaller flow rate; but for the closed system, after the pipe resistance of the branch is determined, although it changes with the climbing height, When the height difference increases, the pressure at the branch inlet will change, but since the outlet is not connected to the atmosphere, the outlet pressure will also change accordingly, thereby ensuring a constant pressure difference and a constant flow rate); when the closed system of the present invention is in operation, the lift of the internal circulation water pump only needs to overcome the pressure loss in the piping system, and there is no need to use a high-lift water pump under large height difference conditions, thereby saving energy; when the closed system of the present invention is in operation, since there is no water tank overflow in the operating loop, it can be operated with full water, effectively avoiding the problem of the highest level water flowing back when the system is shut down and causing the water tank to overflow, resulting in insufficient water when the diameter of the shield machine is large or there is a slope in the excavation, and when the working conditions change, the cooling water flow distribution of each branch of each cooling system is not affected by the change in height difference.

[0019] On the other hand, in the system of the present invention, the balancing water tank is located at the highest point of the closed internal circulation cooling water system, and is connected to the lowest pressure point in the closed water circulation loop through a pipeline system. The balancing water tank is not only used to set the pressure of the entire circulation system; the balancing water tank is also used to exhaust the system, that is, bubbles are most likely to be generated at the lowest pressure point in the system. When the balancing water tank is connected to the lowest pressure point in the closed water circulation loop, the bubbles can rise through the pipeline system and finally be discharged outward from the balancing water tank, so that the entire system is bubble-free, solving the problems of impact, cavitation, poor heat dissipation performance, etc. caused by the system running with air under large height difference; the balancing water tank is further used to replenish water for the closed water circulation loop, that is, when the system needs a large amount of water replenishment due to pipe burst repair and the like, the balancing water tank can also replenish water for the closed water circulation loop through the pipeline system. Compared with conventional closed systems, it can avoid adding separate pressure-setting, water replenishment, and exhaust devices, and the system is simpler. Compared with conventional open systems, the internal circulation water tank used in the open system is eliminated, thereby greatly reducing the total weight of the system, saving installation space and cost.

[0020] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0022] Figure 1 It is a structural schematic diagram of a closed internal circulation cooling water system for a shield machine according to a preferred embodiment of the present invention;

[0023] Figure 2 yes Figure 1 A schematic diagram of the structure of a first embodiment of a closed internal circulation cooling water system for a medium shield machine;

[0024] Figure 3 yes Figure 1 Schematic diagram of the structure of the second embodiment of the closed internal circulation cooling water system of the medium shield machine.

[0025] Legend:

[0026] 1. Balancing water tank; 2. Cooler group to be cooled; 21. Main drive cooler; 22. Gear oil cooler; 23. Hydraulic oil cooler; 24. Transformer cooler; 31. Internal circulation water inlet pipe; 32. Heat dissipation branch pipe; 33. First water supply constant pressure pipe; 34. Second water supply constant pressure pipe; 35. First switch valve; 36. Second switch valve; 4. Water supply system; 41. External water source; 42. Water supply pump; 43. Water supply pipe; 5. Pressure detector; 6. Internal circulation water pump; 7. Internal and external water radiators; 8. Filter device. DETAILED DESCRIPTION

[0027] The embodiments of the present invention are 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.

[0028] Reference Figure 1 The preferred embodiment of the present invention provides a closed internal circulation cooling water system for a shield machine, comprising: a balancing water tank 1 connected to the atmosphere, a waiting-to-be-cooled device group 2 arranged in the shield machine to be water-cooled, an internal circulation water pump 6 for supplying pumping pressure, an internal and external water radiator 7 for dissipating heat from the internal circulation water and the external circulation water, and a pipe system for connecting. The internal circulation water pump 6, the waiting-to-be-cooled device group 2 and the internal and external water radiator 7 are connected end to end in sequence through the pipe system to form a closed water circulation loop. The balancing water tank 1 is located at the highest point of the closed internal circulation cooling water system setting position, and is connected to the lowest pressure point in the closed water circulation loop through the pipe system.

[0029] In order to solve the technical problems that in the existing open system, due to the existence of a large open water tank arranged at a low position of the system and connected to the atmosphere, and the return ends of each cooling branch are connected to the open water tank, when the system is shut down during use, the water at the highest position is easy to flow back due to gravity, thereby causing the open water tank to overflow. When the overflowed water cannot be replenished in time, the system is easy to run without full water when it is operated again, and bubbles are easy to exist when the system is running. The open water tank is large in size and heavy in weight, occupying the limited space of the shield machine. Moreover, since the return ends of each cooling branch are connected to the open water tank connected to the atmosphere, the head required by the water pump in the system also increases with the increase of the slope, and the cooling water flow distribution of each branch of the cooling system is affected when the working conditions change, the present invention proposes a closed internal circulation cooling water system suitable for excavation under all working conditions, which can effectively solve the above problems.

[0030] In the closed internal circulation cooling water system of the present invention, the internal circulation water pump 6, the to-be-cooled group 2 and the internal and external water radiators 7 are connected end to end in sequence through a pipeline system to form a closed water circulation loop. The closed system design is adopted. Since the closed water circulation loop is not connected to the atmosphere, the problem of cooling water flow distribution not meeting the heat dissipation demand caused by the different heights of the cooling branches is avoided (the flow of the cooling branch depends on the pressure difference at both ends of the branch. The open system changes with the change of height, and the branch inlet pressure also changes accordingly. The outlet reflux is connected to an open water tank connected to the atmosphere, and the pressure is always equal to the atmospheric pressure, resulting in a higher height and a smaller flow rate; but for the closed system, after the pipe resistance of the branch is determined, although it changes with the climbing slope, the branch flow rate is not necessarily the same as the height of the branch. As the height increases, the pressure at the branch inlet will change, but since the outlet is not connected to the atmosphere, the outlet pressure will also change accordingly, thereby ensuring a constant pressure difference and a constant flow rate); when the closed system of the present invention is in operation, the lift of the internal circulation water pump 6 only needs to overcome the pressure loss in the piping system, and there is no need to use a high-lift water pump under large height difference conditions, saving energy; when the closed system of the present invention is in operation, since there is no water tank overflow in the operating loop, it can operate with full water, effectively avoiding the problem of the highest level water flowing back when the system is shut down and causing the water tank to overflow, resulting in insufficient water operation when the diameter of the shield machine is large or there is a slope in the excavation, and when the working conditions change, the cooling water flow distribution of each branch of each cooling system is not affected by the change in height difference.

[0031] On the other hand, in the system of the present invention, the balancing water tank 1 is located at the highest point of the closed internal circulation cooling water system, and is connected to the lowest pressure point in the closed water circulation loop through a piping system. The balancing water tank 1 is not only used to maintain constant pressure for the entire circulation system (the balancing water tank 1 not only maintains constant pressure for the entire closed circulation system, but also, since the balancing water tank 1 is always connected to the atmosphere, the pressure at the highest point of the system is always equal to the liquid level pressure difference of the balancing water tank 1, and therefore it can be used to adjust the system pressure, maintain constant pressure, and reduce the pressure fluctuations of the system caused by changes in excavation conditions); the balancing water tank 1 is also used for system exhaust, that is, bubbles are most likely to be generated at the lowest pressure point in the system. When the balancing water tank 1 is When the lowest pressure point in the closed water circulation loop is connected, the bubbles can rise through the pipe system and finally be discharged outward from the balancing water tank 1, so that the entire system is bubble-free, solving the problems of impact, cavitation, poor heat dissipation performance and so on caused by the system running with air under large height difference; the balancing water tank 1 is also used to replenish water for the closed water circulation loop, that is, when the system needs a large amount of water replenishment due to pipe burst repair and other situations, the balancing water tank 1 can also replenish water for the closed water circulation loop through the pipe system. Compared with the conventional closed system, it can avoid adding separate constant pressure, water replenishment and exhaust devices, and the system is simpler. Compared with the conventional open system, the internal circulation water tank used in the open system is eliminated, thereby greatly reducing the total weight of the system, saving installation space and cost.

[0032] Alternatively, if Figure 1 As shown, the piping system includes an inner circulation water inlet pipe 31 and a heat dissipation branch pipe 32. The two ends of the inner circulation water inlet pipe 31 are respectively connected to the water outlet end of the inner circulation water pump 6 and the water inlet end of the cooling device group 2. The water inlet end of the heat dissipation branch pipe 32 is connected to the water outlet end of the cooling device group 2, and the water outlet end of the heat dissipation branch pipe 32 is connected to the water inlet end of the inner circulation water pump 6, and the inner and outer water radiators 7 are connected to the heat dissipation branch pipe 32. The inner circulation water pump 6, the cooling device group 2 and the inner and outer water radiators 7 are connected end to end through the inner circulation water inlet pipe 31 and the heat dissipation branch pipe 32 arranged in sequence to form a closed water circulation loop. When the system is working, the inner circulation water pump 6 is connected to the cooling device group 2 through the inner circulation water inlet pipe 31, and the cooling device group 2 is then connected to the inner and outer water radiators 7 through the heat dissipation branch pipe 32, and the inner and outer water radiators 7 are then connected to the inner circulation water pump 6 through the heat dissipation branch pipe 32, thereby forming a closed water circulation loop.

[0033] Alternatively, if Figure 1As shown, the pipeline system also includes a first water replenishment constant pressure pipe 33 and a second water replenishment constant pressure pipe 34, a first switch valve 35 arranged in the pipeline of the first water replenishment constant pressure pipe 33, and a second switch valve 36 arranged in the pipeline of the second water replenishment constant pressure pipe 34. The first end of the first water replenishment constant pressure pipe 33 is connected to the balancing water tank 1, and the second end thereof is connected to the return water point of the cooling branch with the highest position in the cooler group 2. The first end of the second water replenishment constant pressure pipe 34 is connected to the balancing water tank 1, and the second end thereof is connected to the water inlet end of the internal circulation water pump 6. In actual operation, when the shield machine is excavating at a large slope or the shaft is excavating, the lowest pressure point of the system is the return water point of the cooling branch with the highest position in the cooler group 2, such as Figure 2 When the shield machine is excavating a flat tunnel or a small slope, the lowest point of the system pressure is the water inlet of the internal circulation water pump 6, such as Figure 3 As shown, by selecting the opening of the first switch valve 35 or the second switch valve 36, the system of the present invention can be applied to the needs of excavation conditions including horizontal excavation, inclined shaft excavation, vertical shaft excavation, etc., and has a wide range of applications.

[0034] Preferably, if Figure 1 As shown, the water inlet ends of the first water replenishment constant pressure pipe 33 and the second water replenishment constant pressure pipe 34 merge and are connected to the bottom end of the balancing water tank 1; the water outlet end of the second water replenishment constant pressure pipe 34 merges with the water outlet end of the heat dissipation branch pipe 32 and is connected to the water inlet end of the internal circulation water pump 6.

[0035] Preferably, if Figure 1 As shown, the closed internal circulation cooling water system of the shield machine also includes a pressure detector 5 for detecting pressure, and a controller connected to the pressure detector 5. The pressure detector 5 is arranged at the return water of the cooling branch with the highest setting position in the cooler group 2. The first switch valve 35 and the second switch valve 36 are both electric switch valves or pneumatic switch valves connected to the controller. When the shield machine is a variable working condition tunneling machine, such as horizontal tunneling at the beginning, climbing tunneling, and finally inclined shaft tunneling, the lowest pressure point of the system changes with the change of tunneling working conditions, so a switching system needs to be set, such as Figure 1 When the pressure detector 5 detects that the return water pressure of the highest cooling branch in the loop is less than the atmospheric pressure, the first switch valve 35 is opened and the second switch valve 36 is closed, and the system operates as follows: Figure 2 When the pressure detector 5 detects that the return water pressure of the cooling branch with the highest setting position in the loop is greater than the atmospheric pressure, the first switch valve 35 is closed and the second switch valve 36 is opened, and the system operates as follows Figure 3 shown.

[0036] When the shield machine is a variable-operating-condition tunnel boring machine, the system of the present invention can realize automatic switching and adaptive adjustment to the operating conditions by replacing the manual first switch valve 35 and the second switch valve 36 with pneumatic or electric switch valves. Thus, the detection result of the pressure detector 5 can be linked with the opening and closing of the valve by setting a program, thereby improving the degree of automation of the system.

[0037] Alternatively, if Figure 1 As shown, the cooler group 2 includes a main drive cooler 21, a gear oil cooler 22, a hydraulic oil cooler 23 and a transformer cooler 24 which are sequentially connected in parallel, and the water inlet ends of the four are connected to the water outlet ends of the internal circulation water inlet pipe 31 through branch pipes, and the water outlet ends of the four are connected to the water inlet ends of the heat dissipation branch pipe 32 through branch pipes. In the scheme of the present invention, the cooling branches of the cooler group 2 are set to 4, and each branch contains 1 type of equipment cooler. In other applications, the number of cooling branches and the type and quantity of equipment coolers can be other values.

[0038] Preferably, the cooler group 2 also includes a flow regulating valve arranged in each branch pipe, and the flow regulating valve is connected to the controller. During the climbing process, since the uppermost branch is most likely to have insufficient flow and insufficient heat dissipation of the branch, at this time, the flow regulating valve can be installed on the branch to automatically control the opening of the flow regulating valve and adjust the resistance of each branch, thereby solving the problem that the resistance of each branch is inconsistent with the initial state due to climbing, and solving the problem that the flow distribution changes due to the change of the resistance of each branch pipe, and the distribution does not meet the expectations, so as to adjust the flow adaptively when the working condition of the tunnel boring machine changes, and adjust the flow distribution of each branch to the preset value.

[0039] Alternatively, if Figure 1 As shown, the closed internal circulation cooling water system of the shield machine also includes a water replenishment system 4 for replenishing the balance water tank 1. The water replenishment system 4 includes: an external water source 41 for supplying replenishment water, a water replenishment pump 42 for pumping replenishment water, and a water replenishment pipe 43 for guiding replenishment water. The two ends of the water replenishment pipe 43 are respectively connected to the external water source 41 and the balance water tank 1. The water replenishment pump 42 is connected to the pipeline of the water replenishment pipe 43. One end of the water replenishment pump 42 is connected to the external water source 41, and the other end is connected to the balance water tank 1. When the system leaks a large amount or due to pipe burst maintenance, the system replenishment amount is large. Since the balance water tank 1 is small in size, the system needs to be replenished from the outside at this time. The water replenishment pump 42 can be used to replenish the entire system from the balance water tank 1. In order to reduce the occupied space and the weight of the whole machine of the water replenishment system 4 on the shield machine, the water replenishment pump 42 and the external water source 41 can be placed outside the entire shield machine, and the interface can be reserved on the shield machine.

[0040] Preferably, if Figure 1As shown, the water replenishment system 4 also includes a high liquid level detector and a low liquid level detector which are sequentially arranged in the balancing water tank 1 from top to bottom, and the high liquid level detector and the low liquid level detector are respectively connected to the controller. The water replenishment pump 42 is connected to the controller. The balancing water tank 1 is provided with a high liquid level detector and a low liquid level detector, which can realize the linkage function with the water replenishment pump 42 and realize the automatic water replenishment function. When the liquid level of the balancing water tank 1 is lower than the minimum liquid level, the water replenishment pump 42 is turned on to replenish the balancing water tank 1 with water. When the liquid level of the balancing water tank 1 is higher than the maximum liquid level, the water replenishment pump 42 is turned off, so that the liquid level in the balancing water tank 1 is always maintained between the minimum liquid level and the maximum liquid level, which can prevent the balancing water tank 1 from escaping and ensure that the system can be replenished with water in time.

[0041] Preferably, if Figure 1 As shown, a communication port connected to the atmosphere is provided at the top of the balancing water tank 1 , and a filtering device 8 for preventing external debris from entering the balancing water tank 1 is provided in the communication port.

[0042] The preferred embodiment of the present invention also provides a tunnel boring equipment, including a shield machine, in which a closed internal circulation cooling water system of the shield machine as described above is provided. Thus, the tunnel boring equipment of the present invention not only avoids the problem that the cooling water flow distribution does not meet the heat dissipation demand due to the different heights of the cooling branches, but also makes the lift of the internal circulation water pump 6 only need to overcome the pressure loss in the pipeline system. There is no need to use a high-lift water pump under large height difference conditions, which saves energy and allows full water operation. It effectively avoids the problem that when the shield machine has a large diameter or there is a slope in the excavation, the highest level of water flows back when the system is shut down, causing the water tank to overflow and causing insufficient water operation. When the working conditions change, the cooling water flow distribution of each branch of each cooling system is not affected by the height difference change. On the other hand, the balancing water tank 1 of the system of the present invention is not only used to set the pressure of the entire circulation system, but also used for system exhaust and water replenishment. The system of the present invention is simpler, thereby greatly reducing the total weight of the system, saving installation space and cost.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A shield machine closed internal circulation cooling water system, characterized in that: include: A balance water tank (1) connected to the atmosphere, a cooling device group (2) arranged on the shield machine for water cooling, an internal circulation water pump (6) for supplying pumping pressure, internal and external water radiators (7) for dissipating heat from the internal circulation water and the external circulation water, and a pipe system for connection; The internal circulation water pump (6), the cooling device group (2) and the internal and external water radiators (7) are connected end to end in sequence through a pipeline system to form a closed water circulation loop; The balancing water tank (1) is located at the highest point of the closed internal circulation cooling water system and is connected to the lowest pressure point in the closed water circulation loop through a pipeline system.

2. The shield machine closed internal circulation cooling water system according to claim 1 is characterized in that: The pipeline system includes an internal circulation water inlet pipe (31) and a heat dissipation branch pipe (32); The two ends of the internal circulation water inlet pipe (31) are respectively connected to the water outlet of the internal circulation water pump (6) and the water inlet of the to-be-cooled device group (2); The water inlet end of the heat dissipation branch pipe (32) is connected to the water outlet end of the to-be-cooled device group (2), the water outlet end of the heat dissipation branch pipe (32) is connected to the water inlet end of the internal circulation water pump (6), and the internal and external water radiators (7) are connected to the heat dissipation branch pipe (32); The internal circulation water pump (6), the to-be-cooled device group (2) and the internal and external water radiators (7) are connected end to end through the internal circulation water inlet pipe (31) and the heat dissipation branch pipe (32) which are arranged in sequence to form a closed water circulation loop.

3. The shield machine closed internal circulation cooling water system according to claim 1, characterized in that: The pipeline system further comprises a first water replenishment constant pressure pipe (33) and a second water replenishment constant pressure pipe (34), a first switch valve (35) arranged in the pipeline of the first water replenishment constant pressure pipe (33), and a second switch valve (36) arranged in the pipeline of the second water replenishment constant pressure pipe (34); The first end of the first water replenishment constant pressure pipe (33) is connected to the balancing water tank (1), and the second end thereof is connected to the return water of the cooling branch at the highest position in the cooler group (2); The first end of the second water replenishment constant pressure pipe (34) is connected to the balancing water tank (1), and the opposite second end is connected to the water inlet end of the internal circulation water pump (6).

4. The shield machine closed internal circulation cooling water system according to claim 3 is characterized in that: The water inlet ends of the first water replenishment constant pressure pipe (33) and the second water replenishment constant pressure pipe (34) are merged and connected to the bottom end of the balancing water tank (1); The water outlet end of the second water replenishment constant pressure pipe (34) merges with the water outlet end of the heat dissipation branch pipe (32) and is then connected to the water inlet end of the internal circulation water pump (6).

5. The shield machine closed internal circulation cooling water system according to claim 3, characterized in that: The shield machine closed internal circulation cooling water system also includes a pressure detector (5) for detecting pressure, and a controller connected to the pressure detector (5); The pressure detector (5) is arranged at the water return point of the cooling branch which is arranged at the highest position in the cooler group (2); The first switch valve (35) and the second switch valve (36) are both electric switch valves or pneumatic switch valves connected to a controller.

6. The shield machine closed internal circulation cooling water system according to claim 5, characterized in that: The cooler group (2) includes a main drive cooler (21), a gear oil cooler (22), a hydraulic oil cooler (23) and a transformer cooler (24) which are sequentially connected in parallel, and the water inlet ends of the four are connected to the water outlet ends of the internal circulation water inlet pipe (31) through branch pipes, and the water outlet ends of the four are connected to the water inlet ends of the heat dissipation branch pipe (32) through branch pipes.

7. The shield machine closed internal circulation cooling water system according to claim 6, characterized in that: The cooler group (2) further comprises a flow regulating valve arranged in each branch pipe, and the flow regulating valve is connected to the controller.

8. The shield machine closed internal circulation cooling water system according to claim 5, characterized in that: The shield machine closed internal circulation cooling water system also includes a water replenishment system (4) for replenishing water to the balance water tank (1), and the water replenishment system (4) includes: An external water source (41) for supplying make-up water, a make-up water pump (42) for pumping the make-up water, and a make-up water pipe (43) for guiding the make-up water; The two ends of the water supply pipe (43) are respectively connected to the external water source (41) and the balancing water tank (1); The water supply pump (42) is connected to the pipeline of the water supply pipe (43).

9. The shield machine closed internal circulation cooling water system according to claim 8, characterized in that: The water replenishment system (4) also includes a high liquid level detector and a low liquid level detector which are sequentially arranged in the balance water tank (1) from top to bottom, and the high liquid level detector and the low liquid level detector are respectively connected to the controller; The water replenishment pump (42) is connected to the controller.

10. A tunnel boring device, characterized in that: It comprises a shield machine, in which a closed internal circulation cooling water system for the shield machine as claimed in any one of claims 1 to 9 is provided.

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