A sewage pump and drainage system for sewage treatment at a tunnel boring machine shield

Abstract

The sewage pump and sewage system for sewage treatment at a shield of a tunnel boring machine belong to the technical field of shield tunnel sewage treatment, and the sewage pump comprises a hydraulic motor, a shell, an impeller, a filter screen and a filter screen support. The shell is in a volute structure, the bottom surface is provided with a liquid suction port, and the side surface is provided with a liquid discharge port. The impeller is installed in the shell and is provided with an inner spline hole in the center. The hydraulic motor is fixed to the top surface of the shell, the output shaft is externally fixed with a spline shaft, the outer spline section of the spline shaft is matched with the inner spline hole of the impeller, the filter screen is arranged on the liquid suction port, and the filter screen support is an annular support with filter holes arranged on the side wall and fixed around the liquid suction port. The sewage pump is driven by hydraulic pressure, the hydraulic motor is connected with the impeller through the spline shaft, the sewage pump is compact in size, and is suitable for being installed at the shield of the tunnel boring machine.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of shield tunnel sewage treatment, and specifically discloses a sewage pump and sewage discharge system for sewage treatment at a shield of a tunnel boring machine. BACKGROUND

[0002] During the working process of the tunnel boring machine, a large amount of sewage containing stone blocks, silt and other impurities will accumulate at the shield, and if the sewage cannot be discharged in time, the working of the tunnel boring machine will be affected. The existing sewage pump is large in size and insufficient in sewage discharge capacity, and is difficult to adapt to the complex conditions of the small space, large vibration and high impurity content in the sewage at the shield of the tunnel boring machine. SUMMARY

[0003] The present application aims to provide a sewage pump and sewage discharge system for sewage treatment at a shield of a tunnel boring machine, which can be applied to the complex conditions of the small space, large vibration and high impurity content in the sewage at the shield of the tunnel boring machine.

[0004] To achieve the above-mentioned purpose, the present application provides a sewage pump for sewage treatment at a shield of a tunnel boring machine, which comprises a hydraulic motor, a shell, an impeller, a filter screen and a filter screen support. The shell is in a volute structure, and the bottom surface is provided with a liquid suction port, and the side surface is provided with a liquid discharge port. The impeller is installed in the shell, and the center is provided with an internal spline hole. The hydraulic motor is fixed on the top surface of the shell, and the output shaft is externally fixed with a spline shaft. The external spline section of the spline shaft is matched with the internal spline hole of the impeller. The filter screen is arranged on the liquid suction port. The filter screen support is an annular support with filter holes on the side wall, and is fixed around the outside of the liquid suction port.

[0005] Further, the impeller is a closed impeller, the blades adopt a three-channel Archimedes spiral form, the top surface is provided with an internal spline hole, the bottom surface is provided with a liquid inlet matched with the liquid suction port and turbulence protrusions for preventing the stratified deposition of the mud water, and the three turbulence protrusions are arranged around the liquid inlet.

[0006] Further, a corrosion ring is arranged between the liquid inlet of the impeller and the liquid suction port of the shell, and the corrosion ring is made of an anode material.

[0007] Further, the optical axis section of the spline shaft is rotatably connected with the shell through a tapered roller bearing, the external spline section penetrates through the internal spline hole, and the bottom end is installed with a pressure plate.

[0008] Further, the shell comprises a pump shell, a pump cover and a bottom shell. The top surface and the bottom surface of the pump shell are through and symmetrically arranged. The pump cover is fixed on the top surface of the pump shell through screws, and the tapered roller bearing is installed on the pump cover. The bottom shell is fixed on the bottom surface of the pump shell through screws, the liquid suction port is arranged on the bottom shell, and the filter screen and the filter screen support are fixed on the bottom shell through screws.

[0009] Further, a sealing compression ring and a contact sealing ring are arranged between the top surface of the pump cover and the impeller, and a spring plunger is arranged on the pump cover and is fixed by a self-locking nut and presses against the sealing compression ring.

[0010] Further, the top surface of the impeller is provided with an annular protrusion, and the contact sealing ring presses against the annular protrusion.

[0011] Further, sealing rings are arranged at the connection between the pump cover and the pump shell, the connection between the pump cover and the hydraulic motor, and the connection between the bottom shell and the pump shell; a shaft seal is arranged between the light shaft section of the spline shaft and the pump cover and is located below the tapered roller bearing.

[0012] The application also provides a sewage treatment and discharge system for a tunnel boring machine shield, which comprises a hydraulic pump station and the sewage pump for sewage treatment at the shield of the tunnel boring machine.

[0013] Further, an oil suction filter is arranged between the oil pump and the oil tank; an oil pipe is led out from between the oil pump and the speed regulating valve and is connected to the oil inlet of the overflow valve, and the oil outlet of the overflow valve is connected to the oil tank; a pressure gauge is arranged between the hydraulic motor and the sequence valve; an oil-water heat exchanger is arranged between the sequence valve and the oil tank, and an oil return filter is arranged between the oil-water heat exchanger and the oil tank; a breather is arranged on the oil tank; and the speed regulating valve, the sequence valve and the overflow valve are integrally installed on a control valve seat.

[0014] The application has the following beneficial effects:

[0015] 1. The sewage pump is driven by hydraulic power, which can provide stronger power than electric power, and the hydraulic motor is connected to the impeller through the spline shaft, so that the sewage pump is compact in size and suitable for being installed at the shield of a tunnel boring machine (such as a single / double shield tunnel boring machine, a double-mode tunnel boring machine, etc.), and the bottom of the shell is provided with a filter screen and a filter screen support, the filter screen support supports the entire sewage pump and is provided with a ring-shaped opening for coarse filtration, and the structure is symmetrical in up and down directions, the filter screen can be increased or decreased according to actual needs, and the filter screen can be used for secondary filtration and can be designed in a series and replaced according to actual needs.

[0016] 2. The impeller is a closed impeller, the blade adopts three-channel Archimedes spiral form, the efficiency is high, three turbulent convexes are arranged on the bottom surface, the sewage mud and water can be effectively prevented from being layered and deposited, annular protrusions are arranged on the top surface, and the annular protrusions, the sealing pressure ring, the contact sealing ring and the spring plunger jointly act to assist sealing, and the spring of the spring plunger can ensure that the contact sealing ring is in contact with the annular protrusion before reaching the wear limit, and the contact sealing is always maintained;

[0017] 3. The blow-off system can adjust the pressure flow of the speed regulating valve to adjust the water yield and lift of the sewage pump, which is simple and convenient.

[0018] 4. The blow-off system adopts standardized and modular design, and only the sewage pump is needed, and the sewage pump power station and the hydraulic pipeline are borrowed from the tunnel boring machine, so that the initial procurement cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a structural schematic view of a sewage pump for sewage treatment at a shield of a tunnel boring machine.

[0020] Figure 2 It is another direction view of the sewage pump shown in Figure 1

[0021] Figure 3 It is an axial sectional view of the sewage pump shown in Figure 1

[0022] Figure 4 It is a structural schematic view of an impeller in the sewage pump.

[0023] Figure 5 It is another direction view of the impeller shown in Figure 4

[0024] Figure 6 It is a sectional view of the impeller shown in Figure 4

[0025] Figure 7 It is a structural schematic view of a hydraulic pump station in a blow-off system for sewage treatment at a shield of a tunnel boring machine.

[0026] Figure 8 It is another direction view of the hydraulic pump station.

[0027] Figure 9 It is a hydraulic principle view of the blow-off system for sewage treatment at the shield of the tunnel boring machine.

[0028] Among them, the name corresponding to the reference sign is:

[0029] ​​​​1 - hydraulic motor, 2 - impeller, 2.1 - inner spline hole, 2.2 - liquid inlet, 2.3 - turbulence protrusion, 2.4 - annular protrusion, 2.5 - blade, 3 - filter screen, 4 - filter screen support, 5 - spline shaft, 6 - corrosion ring, 7 - tapered roller bearing, 8 - pressure plate, 9 - pump shell, 10 - pump cover, 11 - bottom shell, 12 - sealing pressure ring, 13 - contact sealing ring, 14 - self-locking nut, 15 - spring plunger, 16 - sealing ring, 17 - shaft seal, 18 - oil tank, 19 - oil pump, 20 - motor, 21 - speed regulating valve, 22 - sequence valve, 23 - oil suction filter, 24 - overflow valve, 25 - pressure gauge, 26 - oil-water heat exchanger, 27 - oil return filter, 28 - breather, 29 - control valve seat. DETAILED DESCRIPTION

[0030] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0031] Embodiment 1

[0032] The present embodiment provides a sewage pump for sewage treatment at the shield of a tunnel boring machine, comprising a hydraulic motor 1, a shell, an impeller 2, a filter screen 3 and a filter screen support 4; the shell is of a volute structure, the bottom surface is provided with a liquid suction port, and the side surface is provided with a liquid discharge port; the impeller 2 is installed in the shell and is provided with an inner spline hole 2.1 at the center; the hydraulic motor 1 is fixed on the top surface of the shell, the output shaft is externally provided with a spline shaft 5, and the outer spline section of the spline shaft 5 is matched with the inner spline hole 2.1 of the impeller 2; the filter screen 3 is arranged on the liquid suction port; and the filter screen support 4 is an annular support provided with filter holes on the side wall and fixed around the liquid suction port.

[0033] The sewage pump is driven by hydraulic power, which can provide stronger power compared with electric power. The hydraulic motor 1 is connected with the impeller 2 through the spline shaft 5, so that the sewage pump is compact in size and suitable for installation at the shield of a tunnel boring machine (such as a single / double shield tunnel boring machine, a double-mode tunnel boring machine, etc.). The shell bottom is further provided with the filter screen 3 and the filter screen support 4, the filter screen support 4 supports the entire sewage pump and is annularly perforated for coarse filtration, and the structure is symmetrical up and down, which can be increased or decreased according to actual needs. The filter screen 3 is used for secondary filtration and can be designed in a series according to actual needs to replace the filter hole size.

[0034] Further, the impeller 2 is a closed impeller, the blades 2.5 are in the form of three-channel Archimedes spiral, the top surface is provided with the inner spline hole 2.1, the bottom surface is provided with the liquid inlet 2.2 matched with the liquid suction port and the turbulence protrusions 2.3 for preventing stratified deposition of mud and water, and the three turbulence protrusions 2.3 are arranged around the liquid inlet 2.2.

[0035] Further, a corrosion ring 6 is arranged between the liquid inlet 2.2 of the impeller 2 and the liquid suction port of the shell, the corrosion ring 6 is made of an anode material such as aluminum, zinc, magnesium, etc., other parts of the sewage pump are made of a cathode material, the corrosion ring 6 and other parts of the sewage pump form a primary cell in sewage, consuming the anode (corrosion ring 6) to protect the cathode (other parts of the sewage pump).

[0036] Further, the light axis segment of the spline shaft 5 is rotatably connected with the shell through a tapered roller bearing 7, the outer spline segment passes through the inner spline hole 2.1, and the bottom end is provided with a pressure plate 8, which is connected with the spline shaft 5 through screws. The tapered roller bearing 7 can offset the radial force generated when the impeller 2 absorbs water, and has higher carrying capacity and longer service life.

[0037] Further, the shell comprises a pump shell 9, a pump cover 10 and a bottom shell 11; the top surface and the bottom surface of the pump shell 9 are through and symmetrically arranged, facilitating machining, inspection and installation; the pump cover 10 is fixed on the top surface of the pump shell 9 through screws, and the tapered roller bearing 7 is installed on the pump cover 10; the bottom shell 11 is fixed on the bottom surface of the pump shell 9 through screws, the liquid suction port is arranged on the bottom shell 11, and the filter screen 3 and the filter screen support 4 are fixed on the bottom shell 11 through screws.

[0038] Further, a sealing compression ring 12 and a contact sealing ring 13 are arranged between the top surface of the pump cover 10 and the impeller 2, a spring plunger 15 is installed on the pump cover 10 through a self-locking nut 14, and the spring plunger 15 is pressed against the sealing compression ring 12. The spring of the spring plunger 15 can ensure that the contact sealing ring 13 keeps in contact with the impeller 2 before reaching the wear limit, and always maintains contact sealing. The contact sealing ring 13 is made of PTFE material or other similar wear-resistant and high-temperature-resistant self-lubricating sealing materials.

[0039] Further, the top surface of the impeller 2 is provided with an annular protrusion 2.4, and the contact sealing ring is pressed against the annular protrusion 2.4. The annular protrusion 2.4 cooperates with the sealing compression ring 12, the contact sealing ring 13 and the spring plunger 15 to play an auxiliary sealing role.

[0040] Further, sealing rings 16 are arranged at the connection between the pump cover 10 and the pump shell 9, the connection between the pump cover 10 and the hydraulic motor 1, and the connection between the bottom shell 11 and the pump shell 9; a shaft seal 17 is arranged between the light axis segment of the spline shaft 5 and the pump cover 10, and the shaft seal 17 is located below the tapered roller bearing 7.

[0041] Example 2

[0042] The embodiment provides a sewage treatment system for sewage treatment at a shield of a tunnel boring machine, comprising a hydraulic pump station and a sewage pump for sewage treatment at the shield of the tunnel boring machine; the hydraulic pump station comprises an oil tank 18, an oil pump 19, a motor 20, a speed regulating valve 21 and a sequence valve 22; the oil pump 19 is driven by the motor 20, the oil inlet is connected with the oil tank 18, and the oil outlet is connected with the oil inlet of the speed regulating valve 21; the working oil inlet of the speed regulating valve 21 is connected with the oil inlet of a hydraulic motor 1; the working oil inlet of the hydraulic motor 1 is connected with the oil inlet of the sequence valve 22, and the oil return is connected with the oil tank 18; and the oil outlet of the sequence valve 22 is connected with the oil tank 18. The speed regulating valve 21 has two modes of manual and electric control, and the electric control mode can be connected to a touch screen in an operation room of the tunnel boring machine, so that operation is convenient.

[0043] Further, an oil suction filter 23 is arranged between the oil pump 19 and the oil tank 18; an oil pipe is led out between the oil pump 19 and the speed regulating valve 21 and connected with the oil inlet of an overflow valve 24, the oil outlet of the overflow valve 24 is connected with the oil tank 18; a pressure gauge 25 is arranged between the hydraulic motor 1 and the sequence valve 22; an oil-water heat exchanger 26 is arranged between the sequence valve 22 and the oil tank 18, a return oil filter 27 is arranged between the oil-water heat exchanger 26 and the oil tank 18; a breather 28 is arranged on the oil tank 18; the speed regulating valve 21, the sequence valve 22 and the overflow valve 24 are integrally installed on a control valve seat 29, and various regulating valves are concentrated on one valve block, which is beneficial to maintenance.

[0044] The hydraulic pump station provides power for the sewage pump through a hydraulic pipeline, meanwhile, most of the heat is taken away to the hydraulic pump station when the hydraulic pipeline returns oil, and then the heat is transferred to cooling water through the oil-water heat exchanger 25 equipped on the hydraulic pump station, so as to be consumed by construction or recycled to the outside of the tunnel.

[0045] The bottom of the oil tank 18 is provided with a rectangular frame, and the oil pump 19, the motor 20 and the control valve seat 27 are arranged in the frame. Through modular design, the oil tank 18 can be arranged separately from the lower frame structure, the overall structure is compact, and the rectangular state is easy to place on the equipment.

[0046] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A mucking system for sewage treatment at a shield of a tunnel boring machine, characterized in that The sewage pump comprises a hydraulic motor, a shell, an impeller, a filter screen and a filter screen support; The shell is in a volute structure, and is provided with a liquid suction port on the bottom surface and a liquid discharge port on the side surface; The impeller is installed in the shell, and is provided with an inner spline hole in the center and a liquid inlet port on the bottom surface matched with the liquid suction port; The hydraulic motor is fixed on the top surface of the shell, and an output shaft is externally fixed with a spline shaft, and the outer spline section of the spline shaft is matched with the inner spline hole of the impeller; The filter screen is arranged on the liquid suction port; The filter screen support is an annular support provided with filter holes on the side wall, and is fixed around the liquid suction port; The hydraulic pump station comprises an oil tank, an oil pump, a motor, a speed regulating valve and a sequence valve; The oil pump is driven by the motor, and the oil inlet port is connected with the oil tank, and the oil outlet port is connected with the oil inlet port of the speed regulating valve; The working oil port of the speed regulating valve is connected with the oil inlet port of the hydraulic motor; The working oil port of the hydraulic motor is connected with the oil inlet port of the sequence valve, and the oil return port is connected with the oil tank; The oil outlet port of the sequence valve is connected with the oil tank; An oil-water heat exchanger is arranged between the sequence valve and the oil tank; The sewage pump is powered by the hydraulic pump station through a hydraulic pipeline, and the heat brought away by the hydraulic pipeline is transferred to the cooling water in the oil-water heat exchanger arranged on the hydraulic pump station, and then enters the cooling water of the whole tunnel boring machine. The impeller is a closed impeller, and the blades are in the form of three-channel Archimedes spiral, and are provided with an inner spline hole on the top surface and turbulence protrusions on the bottom surface for preventing the stratified deposition of sludge and water, and the three turbulence protrusions are arranged around the liquid inlet port.

2. The mucking system for tunnel boring machine shield site sewage treatment according to claim 1, characterized in that, The optical axis section of the spline shaft is rotatably connected with the shell through a tapered roller bearing, the outer spline section penetrates through the inner spline hole, and a pressure plate is installed at the bottom end.

3. The mucking system for tunnel boring machine shield site sewage treatment according to claim 2, characterized in that, The shell comprises a pump shell, a pump cover and a bottom shell; 4. The sewer system for tunnel boring machine shield site sewage treatment according to claim 3, characterized in that, The top surface and the bottom surface of the pump shell are through and symmetrically arranged; The pump cover is fixed on the top surface of the pump shell through screws, and the tapered roller bearing is installed on the pump cover; The bottom shell is fixed on the bottom surface of the pump shell through screws, the liquid suction port is arranged on the bottom shell, and the filter screen and the filter screen support are fixed on the bottom shell through screws. A sealing compression ring and a contact sealing ring are arranged between the top surface of the pump cover and the top surface of the impeller, a spring plunger is installed on the pump cover through a self-locking nut, and the spring plunger is pressed against the sealing compression ring.

5. The sewer system for tunnel boring machine shield site sewage treatment according to claim 4, characterized in that, The top surface of the impeller is provided with an annular protrusion, and the contact sealing ring is pressed against the annular protrusion.

6. The mucking system for tunnel boring machine shield site sewage treatment according to claim 5, characterized in that, Sealing rings are arranged at the connection between the pump cover and the pump shell, the connection between the pump cover and the hydraulic motor and the connection between the bottom shell and the pump shell; 7. The mucking system for tunnel boring machine shield site sewage treatment according to claim 6, characterized in that, An axle seal is arranged between the optical axis section of the spline shaft and the pump cover, and is located below the tapered roller bearing. An oil suction filter is arranged between the oil pump and the oil tank; 8. The mucking system for tunnel boring machine shield site sewage treatment of claim 1, wherein, An oil pipe is led out between the oil pump and the speed regulating valve, and is connected with the oil inlet port of the overflow valve, and the oil outlet port of the overflow valve is connected with the oil tank; A pressure gauge is arranged between the hydraulic motor and the sequence valve; A back oil filter is arranged between the oil-water heat exchanger and the oil tank; A breather is arranged on the oil tank; The speed regulating valve, the sequence valve and the overflow valve are integrally installed on a control valve seat. ​

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