Internal circulation water replenishing system of shield tunneling machine

Abstract

The utility model discloses an internal circulation water replenishing system of a shield tunneling machine, relates to the technical field of a circulating water system of the shield tunneling machine, and solves the problem that the purity of internal circulation water cannot be ensured by an on-line internal circulation water replenishing mode in the prior art. The device comprises a distillation device connected with an internal circulating water system and a filter connected with an external circulating water system, wherein the filter is connected with the distillation device. According to the system, the distillation device is introduced, soft and hard water conversion is reasonably achieved, impurities in water are removed, a complete internal circulation water supplementing system is formed, the internal water supplementing efficiency is greatly improved, the construction cost is reduced, meanwhile, the purity of distilled pure water is higher, and the phenomena of scaling and the like after the distilled pure water is introduced into an internal circulation water system are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of circulating water systems of shield machines, in particular to an internal circulating water replenishment system of a shield machine. Background Art

[0002] The shield machine's circulating water system is divided into an internal circulating water system and an external circulating water system. The internal circulating water system uses purified water or pure water to ensure that the water source is pure and free of impurities. The internal circulating water is independently added to the shield machine's internal circulating water tank from bottled or canned water. The internal circulating water system is a closed system. In theory, it does not exchange substances with other systems, and the total amount of internal circulating water will not decrease or increase. Liquid replacement requires first draining the original liquid from the internal circulating water tank and then filling it with new purified water or pure water to prevent the mixing of other impurities, thereby ensuring that the water quality in the internal circulating water system remains pure, thereby ensuring the heat transfer efficiency of the internal circulating water system.

[0003] Internally circulating water is primarily used to cool key components of shield machines. During circulation, it cools hydraulic oil and gear oil through heat exchangers or flows through cooling pipes to cool equipment such as air compressors, frequency converters, main drive reducers, and screw reducers. After cooling, the internally circulating water returns to the internally circulating water tank. However, during shield machine operation, the temperature of the internally circulating water continues to rise. Although externally circulating water can be used to exchange heat with it through a heat exchanger, the heat transfer efficiency of the heat exchanger is limited, and heat is not fully exchanged, resulting in a high temperature of the internally circulating water. In addition, there are many key components that require internally circulating water cooling. If a leak occurs somewhere, causing internal water loss and unable to be quickly replenished, the internally circulating water system will be paralyzed. Currently, shield machines are replenished by hoisting barreled water from the ground after shutdown. This not only increases construction costs but also seriously affects construction progress.

[0004] With the continuous updating and optimization of modern technology, many water circulation systems and water circulation methods for shield machines have also emerged. For example, Chinese invention patent publication number CN115142860A discloses a water circulation system and water circulation method for a shield machine. This method connects the internal circulating water and the external circulating water through a water inlet tank, and replenishes the internal circulating water with the external circulating water. Although a water replenishment method for the internal circulating water is provided, it cannot guarantee the purity of the replenished water. Due to temperature changes during the cooling process, scaling will occur, which not only reduces the heat dissipation rate of key components, but also seriously causes damage to key components. Therefore, it is very necessary to design a water replenishment system for the internal circulating water of a shield machine. Utility Model Content

[0005] In view of the deficiencies in the above-mentioned background technology, the present invention proposes an internal circulation water replenishment system for a shield machine, which solves the problem in the prior art that the online internal circulation water replenishment method cannot ensure the purity of the internal circulation water.

[0006] The technical solution of the present utility model is achieved by providing an internal circulation water replenishment system for a shield machine, comprising a distillation device connected to the internal circulation water system and a filter connected to the external circulation water system. The filter and the distillation device are connected. The filter can filter the external water, control the water cleanliness, and protect other components in the water replenishment system.

[0007] Preferably, the discharge end of the distillation device is connected to a diaphragm pump, and the diaphragm pump is connected to an inner water tank of the inner circulating water system.

[0008] Preferably, a pressure reducing valve is provided between the filter and the liquid inlet of the distillation apparatus. Furthermore, electric valves are provided between the pressure reducing valve and the liquid inlet of the distillation apparatus, between the filter and the external circulating water system, between the discharge end of the distillation apparatus and the diaphragm pump, and between the diaphragm pump and the inner water tank.

[0009] Preferably, a pressure gauge is provided between the pressure reducing valve and the liquid inlet end of the distillation apparatus. The diaphragm pump is a pneumatic diaphragm pump connected to an industrial air pipeline.

[0010] Preferably, the distillation device includes an evaporator connected to the filter, a heater is provided in the evaporator, a steam pipe is provided on the evaporator, a condenser is provided on the steam pipe, and a condensed water discharge pipe is provided at the lower end of the condenser.

[0011] Preferably, the condensate discharge pipe is connected to a water supply tank, which is connected to a diaphragm pump. The water supply tank is provided with a drain valve, and both the water supply tank and the inner water tank are provided with liquid level sensors.

[0012] Preferably, the condenser includes a condenser pipe passing through the steam pipe, the lower end of the condenser pipe is connected to the cooling water inlet pipe, the upper end is connected to the cooling water outlet pipe, and the mouth of the condenser water discharge pipe corresponds to the lower end of the condenser pipe.

[0013] The beneficial effects of the present utility model are as follows: by providing a filter connected to the external circulating water system, the present system can draw water from the external circulating water system, filter it, and pass it into the distillation device, and the pure water distilled by the distillation device is passed into the internal circulating water system. The introduction of the distillation device in the present system reasonably realizes the conversion between soft and hard water, and removes impurities in the water, forming a complete internal circulating water replenishment system, which greatly improves the internal water replenishment efficiency and reduces the construction cost. At the same time, the pure water after distillation has a higher purity, avoiding the occurrence of scaling and other phenomena after passing into the internal circulating water system. In addition, the pure water obtained by the present system comes from the water of the external circulating water system of the shield machine, that is, industrial water, which is easy to obtain and inexpensive, and is more economical than the bottled pure water used in the traditional water replenishment scheme. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0015] Figure 1 This is a schematic diagram of the structure of the water replenishment system of the utility model;

[0016] Figure 2 This is a schematic structural diagram of the distillation device of the utility model;

[0017] In the figure: 1: diaphragm pump, 2: water supply tank, 3: distillation device, 4: electric valve a, 5: pressure gauge, 6: pressure reducing valve, 7: filter, 8: electric valve b, 9: internal water tank, 10: electric valve c, 11: electric valve d, 12: external circulating water system, 13: internal circulating water system, 14: condensate discharge pipe, 15: condenser, 16: evaporator, 17: heater, 18: steam pipe, 19: drain valve, 20: condenser, 21: cooling water inlet pipe, 22: cooling water outlet pipe, 23: industrial air pipe. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] like Figure 1 、 2 As shown in Example 1, a shield machine internal circulation water replenishment system includes a distillation device 3 connected to the internal circulation water system 13 and a filter 7 connected to the external circulation water system 12. The filter 7 can draw water from the external circulation water system 12 and perform preliminary filtration on the water to remove impurities in the water. The filter 7 is connected to the distillation device 3, so that the filtered water is passed into the distillation device for distillation and purification, and finally the distilled pure water is passed into the internal circulation water system. The introduction of the distillation device in this system reasonably realizes the conversion between soft and hard water and removes impurities in the water, forming a complete internal circulation water replenishment system, greatly improving the internal water replenishment efficiency and reducing construction costs. At the same time, the pure water after distillation has higher purity, avoiding the occurrence of scaling and other phenomena after passing into the internal circulation water system.

[0020] As a further embodiment, the discharge end of the distillation apparatus 3 is connected to a diaphragm pump 1, which is in turn connected to the inner water tank 9 of the internal circulating water system 13. In this embodiment, the diaphragm pump 1 is a pneumatic diaphragm pump connected to an industrial air pipeline 23, thereby utilizing the industrial air pipelines commonly found at construction sites as a power source. When water replenishment is needed, the pneumatic diaphragm pump is used to pump the pure water produced by the distillation apparatus 3 into the inner water tank of the internal circulating water system 13.

[0021] Example 2, a shield machine internal circulation water replenishment system. Based on Example 1, a pressure reducing valve 6 is provided between the filter 7 and the liquid inlet of the distillation apparatus 3. Because the water in the external circulating water system has a certain initial pressure, the pressure reducing valve 6 can regulate the pressure of the water entering through the filter 7. In this embodiment, the filter 7 is connected to the main line of the external circulating water system, and an interface is provided on the main line behind the conventional external circulating filter of the external circulating water system, thereby improving the purity of the external water. Furthermore, pipes connect the pressure reducing valve 6 to the liquid inlet of the distillation apparatus 3, the filter 7 to the external circulating water system 12, the discharge end of the distillation apparatus 3 to the diaphragm pump 1, and the diaphragm pump 1 to the internal water tank 9. These pipes are each equipped with an electric valve. In this embodiment, the electric valves on these pipes include electric valve a4, electric valve b8, electric valve c10, and electric valve d11.

[0022] As a further embodiment, a pressure gauge 5 is provided on the pipeline between the electric valve a4 and the pressure reducing valve 6 , and the pressure gauge 5 can be used to monitor the water pressure after being adjusted by the pressure reducing valve 6 .

[0023] During use, this embodiment uses an external circulating water system to provide water for the water replenishment system. Electric valve b8 regulates the flow of water entering the water replenishment system. Filter 7 then filters the incoming water, controlling its purity and protecting other components within the system. The filtered water then passes through pressure reducing valve 6, which reduces its pressure. By observing pressure gauge 5, electric valve a4 opens when the incoming water pressure reaches a specified, appropriate pressure, allowing the water to enter distillation apparatus 3.

[0024] Example 3, a shield machine internal circulation water supply system, based on Example 2, as Figure 2As shown, the distillation apparatus 3 includes an evaporator 16 connected to a pressure reducing valve 6. An electric valve a4 is positioned on the pipeline between the pressure reducing valve 6 and the evaporator 16. The outer wall of the evaporator 16 is a double-layer vacuum insulation panel, which provides enhanced thermal insulation. A heater 17 is located within the evaporator 16, and a steam pipe 18 is provided on the evaporator 16. In this embodiment, the evaporator is a box-type structure. The pipeline connected to the electric valve a4 communicates with the interior of the evaporator through the side wall of the evaporator. The steam pipe 18 is fixed to the upper opening of the evaporator 16. The heater is positioned at the bottom of the evaporator, allowing the steam generated by the water in the evaporator to rise through the steam pipe.

[0025] In addition, a condenser 15 is provided above the steam pipe 18. This condenser 15 is capable of cooling and maintaining the temperature of the steam pipe. A condensate discharge pipe 14 is provided at the lower end of the condenser 15. During the discharge of steam generated within the evaporator, the steam is pre-cooled and liquefied through the steam pipe 18 to form pure water. This water adheres to the steam pipe, flows down the pipe, and then flows out through the condensate discharge pipe. In this embodiment, the condenser 15 includes a condenser pipe 20 extending through the steam pipe 18. The lower end of the condenser pipe 20 is connected to a cooling water inlet pipe 21, and the upper end is connected to a cooling water outlet pipe 22. In this embodiment, the condenser pipe can optionally be a copper pipe. During use, cooling water flows in through the cooling water inlet pipe 21, drips downward after passing through the condenser pipe, and then flows out through the cooling water outlet pipe, thereby removing heat from the steam pipe and achieving cooling. Optionally, a collection hood can be provided at the mouth of the condensate discharge pipe 14 to more effectively collect the condensed water that drips after condensation.

[0026] As an optional solution, the cooling water inlet pipe 21 and the cooling water outlet pipe 22 can be connected to the main pipeline of the external circulating water system, and the water circulation in the external circulating water system is used to take away the heat. Solenoid valves can be optionally set on the cooling water inlet pipe 21 and the cooling water outlet pipe 22 to control the start and end of cooling water delivery.

[0027] As an optional solution, the condensed water discharge pipe 14 can be directly connected to a diaphragm pump, and the condensed water generated when water replenishment is required is directly pumped into the inner water tank of the inner circulation system through the diaphragm pump.

[0028] As an optional implementation scheme, the condenser 20 can be optionally arranged around the outside of the steam pipe 18 to continuously cool the steam pipe, and the steam is condensed into liquid pure water by utilizing the contact between the steam pipe and the steam. After condensation, the pure water falls along the steam pipe, enters the pipe mouth of the condensate discharge pipe 14 corresponding to the lower end of the steam pipe 18 and is discharged.

[0029] Alternatively, condensate drain pipe 14 can be connected to makeup tank 2, which in turn is connected to diaphragm pump 1. Makeup tank 2 stores purified water produced after distillation. When replenishment is needed, diaphragm pump 1 delivers the purified water from the makeup tank to the internal circulating water system. As a further option, a drain valve 19 can be installed on makeup tank 2 to drain the water after extended use.

[0030] As a further embodiment, both the water supply tank and the inner water tank 9 are equipped with liquid level sensors. Specifically, a low-level sensor and a high-level sensor are installed in each of the water supply tank 2 and the inner water tank 9, respectively. The low-level sensor and high-level sensor of the water supply tank 2 are electrically connected to the electric valve b8 and the electric valve a4, while the low-level sensor and high-level sensor of the inner water tank 9 are electrically connected to the pneumatic diaphragm pump 1, the electric valve c10, and the electric valve d11.

[0031] When this embodiment is in use, during the water production process: when the liquid level in the water make-up tank 2 reaches the low liquid level, the low liquid level sensor therein is triggered, and generates and gives an electrical signal to control the electric valve b8 and the electric valve a4 to open, and adjust the water flow entering the water make-up system. The water make-up system starts to work, and the pure water distilled by the distillation device continuously enters the water make-up tank 2. When the liquid level in the water make-up tank 2 reaches the high liquid level signal, the high liquid level sensor is triggered, and the electric valve b8 and the electric valve a4 are controlled to close.

[0032] During the water replenishment process: when the liquid level of the inner water tank 9 of the internal circulation water system reaches the low liquid level signal, the low liquid level sensor is triggered, and the electric valve c10 and the electric valve d11 are controlled to open, and the pneumatic diaphragm pump 1 starts working to replenish the pure water in the water replenishment tank 2 of the water replenishment system into the inner water tank 9. When the liquid level in the inner water tank 9 reaches the high liquid level signal, the electric valve c10 and the electric valve d11 are closed.

[0033] As conventional optional control means, the low-level sensor, high-level sensor, electric valve b8, electric valve a4, electric valve c10, electric valve d11, distillation apparatus 3, and pneumatic diaphragm pump are all electrically connected to a conventional controller. The controller receives electrical signals and issues corresponding commands to control the operation of the corresponding components. During operation, when the liquid level in the internal water tank 9 drops to a low level, an electrical signal is generated and transmitted to the controller, opening the electric valve b8 at the water inlet of the make-up water system. Industrial water from the external circulating water system flows in as external inlet water, which is pre-treated by filter 7. The pressure of the external inlet water is reduced by pressure-reducing valve 6 before entering the distillation apparatus through a pipeline. The heater in the distillation apparatus operates, generating a large amount of heat energy, which exchanges heat with the external inlet water in the evaporator, causing the external inlet water to boil and produce a large amount of steam. The steam enters the condenser through a steam pipe. Cold cooling water flows through the condenser, and the condenser steam exchanges heat with the cold cooling water, converting the steam into liquid distilled water. The liquid distilled water is collected along the outer wall of the condenser tube and discharged through the condensate discharge pipe into the make-up water tank. When the liquid level in the inner water tank reaches the high level, the corresponding valve at the water inlet is closed and water replenishment stops, thereby achieving efficient water replenishment of the inner circulating water system without stopping the shield machine.

[0034] As an optional implementation, the electric valve b8, electric valve a4, electric valve c10 and electric valve d11 in the above embodiment all adopt manual ball valves, and the water replenishment process is controlled by manually operating the corresponding ball valve when water replenishment is required.

[0035] This system introduces a novel internal water replenishment solution. Distilled water from the distillation unit is first collected. Once a leak alarm is triggered in the internal water cycle, the collected distilled water is quickly added to the internal water cycle. This eliminates the need for machine downtime for replenishment in traditional replenishment solutions and improves construction efficiency. The distilled water is sourced from the shield machine's external circulation water, or industrial water, which is readily available and inexpensive, making it more economical than the barreled distilled water used in traditional replenishment solutions. The liquid level sensor and electric valve are interlocked to enable timely response to unexpected conditions, achieving intelligent and efficient operation during shield machine tunnel construction.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A shield machine internal circulation water supply system, characterized by: The invention comprises a distillation device (3) connected to an internal circulating water system (13) and a filter (7) connected to an external circulating water system (12), wherein the filter (7) and the distillation device (3) are connected; the distillation device (3) comprises an evaporation pot (16) connected to the filter (7), a heater (17) is provided in the evaporation pot (16), a steam pipe (18) is provided on the evaporation pot (16), a condenser (15) is provided on the steam pipe (18), and a condensed water discharge pipe (14) is provided at the lower end of the condenser (15).

2. The shield machine internal circulation water supply system according to claim 1, characterized in that: The discharge end of the distillation device (3) is connected to a diaphragm pump (1), and the diaphragm pump (1) is connected to an inner water tank (9) of an inner circulating water system (13).

3. The shield machine internal circulation water supply system according to claim 2, characterized in that: A pressure reducing valve (6) is provided between the filter (7) and the liquid inlet end of the distillation device (3).

4. The shield machine internal circulation water supply system according to claim 3 is characterized in that: Electric valves are provided between the pressure reducing valve (6) and the liquid inlet end of the distillation device (3), between the filter (7) and the external circulating water system (12), between the discharge end of the distillation device (3) and the diaphragm pump (1), and between the diaphragm pump (1) and the inner water tank (9).

5. The shield machine internal circulation water supply system according to claim 4, characterized in that: A pressure gauge (5) is provided between the pressure reducing valve (6) and the liquid inlet end of the distillation device (3).

6. The shield machine internal circulation water supply system according to claim 5, characterized in that: The diaphragm pump (1) is a pneumatic diaphragm pump, which is connected to an industrial air pipeline (23).

7. The shield machine internal circulation water supply system according to any one of claims 2 to 6, characterized in that: The condensed water discharge pipe (14) is connected to the water supply tank (2), and the water supply tank (2) is connected to the diaphragm pump (1).

8. The shield machine internal circulation water supply system according to claim 7, characterized in that: The water supply tank (2) is provided with a drain valve (19), and both the water supply tank and the inner water tank (9) are provided with liquid level sensors.

9. The shield machine internal circulation water supply system according to claim 8, characterized in that: The condenser (15) includes a condensing pipe (20) passing through the steam pipe (18), the lower end of the condensing pipe (20) is connected to the cooling water inlet pipe (21), and the upper end is connected to the cooling water outlet pipe (22), and the pipe mouth of the condensing water discharge pipe (14) corresponds to the lower end of the condensing pipe (20).

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