Electric submersible slurry pump special for vertical shaft shield tunneling machine with submersible depth of 150 meters

Abstract

The invention relates to the technical field of submersible pumps, and discloses an electric submersible slurry pump special for a vertical shaft shield tunneling machine with the submersible depth of 150 m. The electric submersible slurry pump comprises a self-adaptive sealing shell, a self-adaptive sealing structure, a pump shaft and a pump body, and pressure balance films are arranged on an initial sealing chamber and a pressure adjusting sealing chamber and can conduct self-deformation according to external pressure; an energy storage type pressure adjusting structure is arranged at a pressure balance film of the pressure adjusting sealing chamber, and when the pressure exceeds an energy storage limit, the pressure balance film in the energy storage type pressure adjusting structure can deform automatically along with the external pressure; layered arrangement of the multi-stage sealing chambers is combined with sealing liquid filling, an efficient pressure buffering barrier is formed, dynamic matching of sealing pressure and external deep water pressure can be preliminarily achieved in cooperation with the self-adaptive deformation capacity of the pressure balance film, tiny pressure fluctuation is further filtered out through the arrangement of the energy storage type pressure adjusting structure, and the sealing effect is improved. And the impact of sudden pressure change on a sealing system is avoided, so that the sealing reliability of equipment in a deep water pressure environment is improved.

Description

Technical Field

[0001] This invention relates to the field of submersible pump technology, and in particular to an electric submersible slurry pump specifically designed for vertical shaft tunnel boring machines with a diving depth of 150 meters. Background Technology

[0002] With the continuous advancement of large-scale underground engineering projects such as urban rail transit, river-crossing tunnels, underground space development, and water conservancy and mining, shield tunneling has become the mainstream technology for underground tunnel construction due to its advantages such as high tunneling efficiency, strong adaptability to geological formations, and minimal impact on the surrounding environment. Among them, vertical shaft shield tunneling machines, as intelligent and mechanized vertical shaft excavation equipment developed in recent years, belong to the category of special shield tunneling technology. They break the inherent mode of traditional vertical shaft construction, adopt a vertical downward tunneling method, and integrate multiple functions such as excavation, muck removal, support, and guidance. The construction process is safe and efficient, with high shaft accuracy and minimal disturbance to the surrounding environment. At present, they are widely used in various projects such as tunnel ventilation shafts, launching and receiving shafts, and deep vertical shafts in water conservancy and mining, representing the advanced development direction of current vertical shaft construction technology.

[0003] As a core component of the muck removal system of a vertical shaft tunnel boring machine (TBM), the submersible slurry pump forms a collaborative relationship with the TBM as a "key auxiliary machine and main machine." Especially in the slurry circulation muck removal mode of the TBM, the submersible slurry pump plays a crucial role. When the muck and water generated by the cutterhead of the TBM mix to form slurry, the high-concentration, large-particle slurry needs to be vertically transported from underground to the surface for treatment by the submersible slurry pump. It is an important support for ensuring the continuous and efficient tunneling of the TBM, and its performance matching directly affects the muck removal efficiency and construction stability of the TBM.

[0004] With the increasing number of deep vertical shaft projects (30-120 meters), some existing electric submersible slurry pumps (immersion depth not exceeding 30 meters) suffer from insufficient high-water-pressure sealing reliability, posing an extremely high risk of water ingress into the motor. A water depth of 150 meters corresponds to a water pressure of approximately 1.5 MPa (about 15 atmospheres), far exceeding the sealing design threshold of conventional submersible slurry pumps. Existing equipment mostly adopts a single-end mechanical seal structure without a pressure balancing mechanism. High water pressure acts directly on the sealing end face, resulting in excessive specific pressure on the sealing surface and accelerated wear. At the same time, the sealing cavity is directly connected to the pump cavity, allowing hard particles such as sand and gravel in the slurry to easily penetrate the sealing surface, causing abrasive damage, which in turn leads to seal failure, water ingress into the motor cavity, and short-circuit burnout of the motor. Related engineering cases show that in deep vertical shaft conditions, conventional submersible slurry pumps experience a high proportion of shutdown failures caused by seal failure, seriously affecting the continuity of construction. Summary of the Invention

[0005] The purpose of this invention is to solve the problem that electric submersible slurry pumps in the prior art are prone to seal failure under high water pressure, which leads to water ingress and burnout of the motor. The invention proposes a special electric submersible slurry pump for vertical shaft shield machines with a diving depth of 150 meters.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: An electric submersible slurry pump for shield tunneling shafts with a diving depth of 150 meters includes: an adaptive sealing shell, an adaptive sealing structure, a pump shaft, and a pump body; The adaptive sealing shell has a water inlet passage communicating with the outside on one side, and a mechanical seal receiving cavity is provided inside the adaptive sealing shell, with the adaptive sealing structure installed inside the mechanical seal receiving cavity; The output end of the pump shaft extends into the pump body through an adaptive sealing shell. A mechanical seal structure is provided on the pump shaft to isolate the adaptive sealing shell from the pump body. The mechanical seal structure is matched with the adaptive sealing structure. The adaptive sealing structure includes several sealing chambers filled with sealing fluid, one of which is the initial sealing chamber and the remaining sealing chambers are pressure regulating sealing chambers. The initial sealing chamber and the pressure regulating sealing chamber are arranged sequentially from the outside to the inside. Both the initial sealing chamber and the pressure regulating sealing chamber are equipped with pressure balancing membranes that can self-deform according to external pressure. The pressure balancing membrane in the pressure regulating sealing chamber is equipped with an energy storage pressure regulating structure. The energy storage pressure regulating structure can store energy. When the pressure exceeds the energy storage limit, the pressure balancing membrane in the energy storage pressure regulating structure will self-deform in accordance with the external pressure.

[0007] As a further embodiment of the present invention, the energy storage voltage regulating structure includes a voltage regulating tube, a voltage regulating balance diaphragm, a mounting plate, a double-ended piston, and a voltage regulating spring. The pressure regulating tube is located at the top of the pressure balancing diaphragm, and the pressure balancing diaphragm is located at the top of the pressure regulating tube. The mounting plate is located inside the pressure regulating tube. The double-ended piston is mounted on the mounting plate, with its two ends abutting against the pressure balancing diaphragm and the pressure balancing diaphragm, respectively. The pressure regulating spring is mounted on the double-ended piston, with its two ends abutting against the top of the double-ended piston and the mounting plate, respectively. When the pressure balancing diaphragm is subjected to pressure, the pressure it experiences is greater than the tension of the pressure regulating spring, and the pressure regulating spring is compressed. This causes the deformation of the pressure balancing diaphragm to be transmitted to the pressure balancing diaphragm through the double-ended piston, resulting in deformation of the pressure balancing diaphragm.

[0008] As a further aspect of the present invention, the pressure regulating springs in several energy storage pressure regulating structures have progressively weaker elasticity from the outside to the inside, so that when the equipment is located in water, the pressure in several pressure regulating sealing chambers decreases progressively from the outside to the inside.

[0009] As a further embodiment of the present invention, both the initial sealing chamber and the pressure regulating sealing chamber are provided with detection tubes, and oil and water probes are installed inside the detection tubes.

[0010] As a further aspect of the present invention, a plurality of filter screens are provided in the water inlet passage, with the mesh size of the filter screens decreasing from large to small in sequence.

[0011] As a further embodiment of the present invention, the mechanical seal structure is composed of multiple sealing blocks, and the mechanical seal structure adopts a multi-end face sealing method.

[0012] As a further embodiment of the present invention, it also includes a motor housing, a junction box mounting base, a motor cover, a stator and rotor, and mounting bearings; The motor housing is fixedly connected to the self-adaptive sealing housing, the junction box mounting base is fixedly connected to the motor housing, the motor cover is fixedly connected to the junction box mounting base, the stator and rotor are located inside the motor housing and coaxial with the pump shaft, and the mounting bearing is located on the outside of the pump shaft.

[0013] As a further embodiment of the present invention, a pump cover is installed at one end of the pump body. The pump cover has an inner flared opening and a T-shaped opening at the bottom, which facilitates connection with equipment or pipelines.

[0014] As a further embodiment of the present invention, an impeller is provided at the output end of the pump shaft. The impeller is located inside the pump body, and an impeller lock nut is installed on the axial part of the impeller to restrict the axial movement of the impeller.

[0015] As a further aspect of the invention, a cable clamp is installed on the motor cover for the cable to pass through.

[0016] Compared with the prior art, the beneficial effects of the present invention are: This invention provides a stable and reliable installation foundation for the sealing structure through the design of an integrated high-strength adaptive sealing shell, ensuring that the shell does not deform under deep water pressure. The hierarchical arrangement of the multi-level sealing chambers, combined with the filling of the sealing fluid, forms an efficient pressure buffer barrier. With the adaptive deformation capability of the pressure balancing membrane, the dynamic matching between the sealing pressure and the external deep water pressure can be initially achieved. The setting of the energy storage pressure regulating structure further filters out small pressure fluctuations and avoids the impact of sudden pressure changes on the sealing system. Overall, it improves the sealing reliability of the equipment under 150-meter deep water pressure and effectively prevents water and slurry from intruding into the internal components. This invention constructs a stepped pressure buffer system through the design of a gradient elastic pressure regulating spring. This system distributes the concentrated load of 150-meter deep water pressure to multiple pressure regulating sealing chambers, preventing individual sealing chambers from bearing excessive pressure loads and significantly reducing the wear rate of individual sealing components. At the same time, the gradient decrease in pressure makes the pressure regulation of the sealing system more stable, reducing pressure interference between sealing chambers and ensuring that each sealing chamber can work stably within its appropriate pressure range. This further improves the pressure resistance and service life of the entire sealing system, providing a core guarantee for the long-term stable operation of the equipment in a 150-meter deep vertical shaft environment. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of a dedicated electric submersible slurry pump for vertical shaft tunnel boring machines with a diving depth of 150 meters, as proposed in this invention. Figure 2 This is a structural cross-sectional schematic diagram of a dedicated electric submersible slurry pump for vertical shaft tunnel boring machines with a diving depth of 150 meters, as proposed in this invention. Figure 3 This is a schematic diagram of the adaptive sealing structure of a special electric submersible slurry pump for a vertical shaft shield machine with a diving depth of 150 meters, as proposed in this invention. Figure 4 This is a schematic diagram of the location of the energy storage pressure regulating structure of a special electric submersible slurry pump for a vertical shaft shield machine with a diving depth of 150 meters, as proposed in this invention. Figure 5 This is a schematic cross-sectional view of the energy storage and pressure regulating structure of an electric submersible slurry pump for a vertical shaft shield machine with a diving depth of 150 meters, as proposed in this invention.

[0018] In the diagram: 100, Adaptive sealing shell; 110, Water inlet passage; 111, Filter screen; 120, Mechanical seal housing; 200, Adaptive sealing structure; 210, Initial sealing chamber; 220, Pressure regulating sealing chamber; 230, Pressure balancing membrane; 240, Energy storage pressure regulating structure; 241, Pressure regulating pipe; 242, Pressure regulating balancing membrane; 243, Mounting plate; 244, Double-ended piston; 245, Pressure regulating spring; 250, Detection tube; 251, Oil-water probe; 300, Pump shaft; 301, Impeller; 310, Mechanical seal structure; 400, Pump body; 410, Pump cover; 500, Motor housing; 600, Junction box mounting base; 700, Motor cover; 710, Cable sleeve; 800, Stator and rotor; 900, Mounting bearing. Detailed Implementation

[0019] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0020] like Figure 1 and Figure 2 As shown, a special electric submersible slurry pump for vertical shaft shield tunneling machines with a diving depth of 150 meters includes: an adaptive sealing shell 100, an adaptive sealing structure 200, a pump shaft 300, and a pump body 400. like Figure 3 As shown, the adaptive sealing shell 100 is integrally cast from a high-strength wear-resistant alloy. One side of it is provided with a water inlet passage 110 that communicates with the external water body along the horizontal direction. An organic seal receiving cavity 120 is opened in the interior of the adaptive sealing shell 100 along the axial direction. The inner wall of the mechanical seal receiving cavity 120 is precision ground. The adaptive sealing structure 200 is installed in the mechanical seal receiving cavity 120. like Figure 2 As shown, the pump shaft 300 is arranged along the axis of the adaptive sealing shell 100. Its output end passes through the adaptive sealing shell 100 and extends into the pump body 400. A mechanical seal structure 310 is installed on the pump shaft 300 at the connection position between the adaptive sealing shell 100 and the pump body 400. The outer end face of the mechanical seal structure 310 is tightly fitted with the inner end face of the adaptive sealing structure 200 to form a sealing fit to achieve isolation between the adaptive sealing shell 100 and the pump body 400. like Figure 3 and Figure 4 As shown, the adaptive sealing structure 200 includes several independent sealed chambers. Each chamber is filled with a sealing fluid with lubricating and compression-resistant properties (high-viscosity methyl silicone oil can be selected, with a density slightly greater than water, insoluble in water, resistant to high temperature and aging, long service life, good compatibility with fluororubber and silicon carbide seals, non-toxic, and not easily volatile). The chamber closest to the water inlet passage 110 is the initial sealing chamber 210, and the remaining chambers are pressure regulating sealing chambers 220. The initial sealing chamber 210 and the pressure regulating sealing chamber 220 are arranged in order from the outside to the inside, and adjacent chambers are separated by welded sealing partitions. like Figure 3 As shown, elastic and wear-resistant pressure balancing membranes 230 are fixedly mounted on the outer end faces of the initial sealing chamber 210 and the pressure regulating sealing chamber 220. The pressure balancing membranes 230 are set on the top surface of the sealing chamber and can adaptively deform elastically according to changes in external water pressure. Energy storage pressure regulating structures 240 are correspondingly set on the outer side of the pressure balancing membranes 230 of the pressure regulating sealing chamber 220. The energy storage pressure regulating structure 240 has an energy storage buffer function. Only when the external pressure exceeds its preset energy storage limit will the pressure balancing membranes 230 in the energy storage pressure regulating structure 240 undergo synchronous self-deformation with the external pressure. This invention provides a stable and reliable installation foundation for the sealing structure through the design of an integrated high-strength adaptive sealing shell 100, ensuring that the shell does not deform under deep water pressure. The hierarchical arrangement of the multi-level sealing chambers, combined with the filling of the sealing fluid, forms an efficient pressure buffer barrier. With the adaptive deformation capability of the pressure balancing membrane 230, the dynamic matching between the sealing pressure and the external deep water pressure can be initially achieved. The setting of the energy storage pressure regulating structure 240 further filters out small pressure fluctuations, avoids the impact of sudden pressure changes on the sealing system, significantly improves the sealing reliability of the equipment under a 150-meter deep water pressure environment, and effectively prevents water and slurry from intruding into the internal components.

[0021] like Figure 4 and Figure 5 As shown, the energy storage type pressure regulating structure 240 includes a pressure regulating tube 241, a pressure regulating balance diaphragm 242, a mounting plate 243, a double-headed piston 244, and a pressure regulating spring 245; The pressure regulating pipe 241 is a hollow tubular structure. Its lower end is located at the top of the pressure balancing diaphragm 230 in the pressure regulating sealing chamber 220. The pressure balancing diaphragm 242 is fixedly mounted on the top of the pressure regulating pipe 241. Its material is the same as that of the pressure balancing diaphragm 230, possessing excellent elasticity and wear resistance. The mounting plate 243 is fixed in the middle section inside the pressure regulating pipe 241. The center of the mounting plate 243 has a guide hole adapted to the double-ended piston 244. The double-ended piston 244 can slide up and down along the guide hole. Each end of the piston has an integrally formed push-up boss. One push-up boss tightly abuts against the center of the pressure balancing diaphragm 242, and the other push-up boss abuts against the center of the pressure balancing diaphragm 230. Spring 245 is mounted on the middle section of the shaft of double-ended piston 244. The two ends of the spring abut against the bottom of the push boss at the top of double-ended piston 244 and the upper surface of mounting plate 243, respectively. In the initial state, it is in a tensioned state. When the pressure regulating balance diaphragm 242 is subjected to external pressure, if the pressure is less than the initial tension of the pressure regulating spring 245, the pressure regulating spring 245 remains stationary and the double-ended piston 244 has no displacement. If the pressure is greater than the tension of the pressure regulating spring 245, the pressure regulating spring 245 is compressed. The deformation generated by the pressure regulating balance diaphragm 242 is synchronously transmitted to the pressure balance diaphragm 230 through the push boss of double-ended piston 244, driving the pressure balance diaphragm 230 to generate corresponding deformation. This invention achieves precise control and buffering of pressure transmission through the design of an energy storage pressure regulating structure 240. The stepped shaft of the double-headed piston 244, in conjunction with the guide hole, ensures the smoothness of the movement process and prevents jamming. The energy storage function of the pressure regulating spring 245 forms a threshold mechanism for pressure regulation, which can effectively filter out minute pressure fluctuations, ensuring that the sealing system only responds to pressure changes exceeding the threshold, thereby improving the stability of sealing pressure regulation. At the same time, the precise transmission of pressure through the double-headed piston 244 ensures the synchronization of the deformation of the pressure regulating balance membrane 242 and the pressure balance membrane 230, achieving precise regulation of the sealing hydraulic pressure and further enhancing the reliability of the sealing system under deep water pressure conditions.

[0022] like Figure 4 and Figure 5 As shown, the pressure regulating springs 245 in several energy storage pressure regulating structures 240 adopt a gradient elastic force design. That is, along the direction from the initial sealing chamber 210 to the inner pressure regulating sealing chamber 220, the initial tension of the pressure regulating springs 245 corresponding to each energy storage pressure regulating structure 240 decreases sequentially. This design allows the external water pressure to be transmitted step by step from the initial sealing chamber 210 to each pressure regulating sealing chamber 220 when the equipment is completely submerged in 150 meters of water. Under the action of the corresponding pressure regulating springs 245, the internal sealing fluid pressure of each pressure regulating sealing chamber 220 presents a gradient distribution state that decreases sequentially from the outside to the inside. This invention constructs a stepped pressure buffer system through the design of a gradient elastic pressure regulating spring 245, which distributes the concentrated load of 150-meter deep water pressure to multiple pressure regulating sealing chambers 220. This avoids excessive pressure load on a single sealing chamber, significantly reducing the wear rate of individual sealing components. At the same time, the gradient decrease in pressure makes the pressure regulation of the sealing system more stable, reduces pressure interference between sealing chambers, and ensures that each sealing chamber can work stably within its appropriate pressure range. This further improves the pressure resistance and service life of the entire sealing system, providing a core guarantee for the long-term stable operation of the equipment in a 150-meter deep vertical shaft environment.

[0023] like Figure 4 and Figure 5 As shown, both the initial sealing chamber 210 and the pressure regulating sealing chamber 220 are equipped with detection tubes 250. An oil-water probe 251 is installed inside the detection tube 250, which is in direct contact with the sealing fluid. The signal line of the oil-water probe 251 is introduced into the motor housing 500 and electrically connected to the ground control system of the equipment, so that the sealing fluid status detection data can be transmitted to the control console in real time. This invention achieves comprehensive and precise real-time monitoring of the sealing system by individually setting up a detection tube 250 and an oil-water probe 251 in each sealing chamber. It can directly locate the specific sealing chamber where the seal has failed, solving the problem that traditional overall monitoring cannot accurately locate the fault point. The stainless steel detection tube 250 has excellent pressure resistance and corrosion resistance, making it suitable for the harsh environment of deep vertical shafts. The real-time data transmission and monitoring function allows the staff to keep track of the sealing system status on the ground. Once abnormal situations such as sealing fluid contamination (mixing in water or slurry) occur, it can respond and handle them quickly, preventing the sealing failure range from expanding and preventing core components such as motors from being damaged by water ingress, thus significantly reducing equipment operation and maintenance costs and downtime.

[0024] like Figure 2 and Figure 3 As shown, several filter screens 111 are fixedly installed in sequence along the water flow direction on the water inlet passage 110. The number of filter screens 111 is set according to the working conditions. Each filter screen 111 is made of high-strength stainless steel, and the wires are thickened and strengthened. The mesh diameter of the filter screens 111 is set in a gradient decreasing along the water flow direction, that is, the mesh diameter of the filter screen 111 near the outside is the largest, and it decreases inward. Each filter screen 111 is sealed and assembled with the water inlet passage 110. This invention achieves step-by-step purification of water entering the sealed area through the design of a multi-stage gradient filter screen 111. First, the large-pore filter screen 111 intercepts large particles of impurities such as gravel and concrete blocks. Then, the medium and small-pore filter screen 111 filters out fine impurities such as sand and dust, reducing the abrasive wear of impurities on the sealed structure from the source. The high-strength stainless steel material and thickened mesh design improve the wear resistance and impact resistance of the filter screen 111, extending its service life.

[0025] like Figure 3 As shown, the mechanical seal structure 310 is composed of multiple sealing blocks and adopts a multi-end face sealing method. This invention adopts a multi-end face sealing design with multiple sealing blocks, forming a multi-level sealing barrier. Compared with the traditional single-end face sealing, the sealing reliability is greatly improved. It can effectively prevent slurry in the pump body 400 from intruding into one side of the adaptive sealing shell 100, avoiding slurry contamination of the sealing fluid or damage to the sealing components.

[0026] like Figure 1 and Figure 2 As shown, the present invention also includes a motor housing 500, a junction box mounting base 600, a motor cover 700, a stator and rotor 800, and a mounting bearing 900; The motor housing 500 is fixedly connected to the self-adaptive sealing housing 100. The junction box mounting base 600 is fixedly connected to the motor housing 500. The motor cover 700 is fixedly connected to the junction box mounting base 600. The stator and rotor 800 are located inside the motor housing 500 and coaxial with the pump shaft 300. The stator is fixed to the inner wall of the motor housing 500. The rotor is fixed to the pump shaft 300 by a key connection. The mounting bearings 900 are located on the outside of the pump shaft 300 and are installed at both ends inside the motor housing 500. The bearing housings are interference-fitted with the motor housing 500.

[0027] like Figure 1 and Figure 2 As shown, one end of the pump body 400 is fixedly connected to the front end of the adaptive sealing shell 100 by bolts, and a sealing ring is provided on the connection surface. The other end of the pump body 400 is fitted with a pump cover 410 by bolts. The pump cover 410 is made of wear-resistant cast iron. The inner side of the pump cover 410 has an inner flared structure. The larger end of the flared opening faces the inside of the pump body 400, and the smaller end faces the outside of the pump body 400, forming a gradient inlet channel. A T-shaped opening is provided at the bottom of the pump cover 410. The T-shaped opening is used to achieve a sealed connection with external conveying equipment or pipelines. This invention, through the design of the inner flared pump cover 410, guides the slurry smoothly into the pump body 400, reducing slurry flow resistance and eddies, preventing slurry from accumulating and clogging at the pump inlet, and ensuring continuous slurry discharge. The T-shaped connection design enables quick assembly and disassembly of the pump body 400 and external pipelines, greatly improving installation and maintenance efficiency, and is suitable for operation in confined spaces in vertical shafts. The wear-resistant cast iron pump cover 410 enhances the wear resistance of the components and extends their service life.

[0028] like Figure 2 As shown, an impeller 301 is provided at the output end of the pump shaft 300. The impeller 301 is located inside the pump body 400. An impeller 301 lock nut is installed on the axial part of the impeller 301 to restrict the axial movement of the impeller 301 and prevent the impeller 301 from colliding and rubbing against the pump body 400 and the pump cover 410, thus ensuring the rotational stability of the impeller 301 and the slurry discharge efficiency.

[0029] like Figure 1 and Figure 2 As shown, a cable sleeve 710 is installed on the motor cover 700. The cable sleeve 710 is made of high-strength elastic rubber material, and its interior is a hollow channel that is precisely matched with the outer diameter of the cable for the cable to pass through.

[0030] The basic principles, main features, and advantages of this invention have been described above. Those skilled in the art should understand that this invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to this invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of this invention.

Claims

1. A special electric submersible slurry pump for vertical shaft tunnel boring machines with a diving depth of 150 meters, characterized in that, include: Adaptive sealing housing (100), adaptive sealing structure (200), pump shaft (300) and pump body (400); The adaptive sealing shell (100) has a water inlet passage (110) communicating with the outside on one side, and the adaptive sealing shell (100) has a mechanical seal receiving cavity (120) inside, and the adaptive sealing structure (200) is installed inside the mechanical seal receiving cavity (120); The output end of the pump shaft (300) extends into the pump body (400) through the adaptive sealing shell (100). The pump shaft (300) is provided with a mechanical seal structure (310) for isolating the adaptive sealing shell (100) from the pump body (400). The mechanical seal structure (310) matches the adaptive sealing structure (200). The adaptive sealing structure (200) includes several sealing chambers filled with sealing fluid, one of which is the initial sealing chamber (210), and the remaining sealing chambers are pressure regulating sealing chambers (220). The initial sealing chamber (210) and the pressure regulating sealing chamber (220) are arranged sequentially from the outside to the inside. Both the initial sealing chamber (210) and the pressure regulating sealing chamber (220) are provided with pressure balancing membranes (230), which can self-deform according to external pressure. An energy storage pressure regulating structure (240) is provided at the pressure balancing membrane (230) of the pressure regulating sealing chamber (220). The energy storage pressure regulating structure (240) can store energy. When the pressure exceeds the energy storage limit, the pressure balancing membrane (230) in the energy storage pressure regulating structure (240) will self-deform according to the external pressure.

2. The electric submersible slurry pump for vertical shaft shield tunneling machines with a diving depth of 150 meters as described in claim 1, characterized in that, The energy storage type pressure regulating structure (240) includes a pressure regulating tube (241), a pressure regulating balance diaphragm (242), a mounting plate (243), a double-headed piston (244), and a pressure regulating spring (245). The pressure regulating tube (241) is located at the top of the pressure balancing membrane (230), the pressure balancing membrane (242) is located at the top of the pressure regulating tube (241), the mounting plate (243) is located inside the pressure regulating tube (241), the double-ended piston (244) is mounted on the mounting plate (243), and its two ends abut against the pressure balancing membrane (242) and the pressure balancing membrane (230) respectively. The pressure regulating spring (245) is mounted on the double-ended piston (244), and its two ends abut against the top of the double-ended piston (244) and the mounting plate (243) respectively. When the pressure balancing membrane (242) is subjected to pressure, the pressure it receives is greater than the tension of the pressure regulating spring (245), and the pressure regulating spring (245) is compressed, so that the deformation of the pressure balancing membrane (242) is transmitted to the pressure balancing membrane (230) through the double-ended piston (244), causing the pressure balancing membrane (230) to deform.

3. The electric submersible slurry pump for vertical shaft shield tunneling machines with a diving depth of 150 meters as described in claim 2, characterized in that, The pressure regulating springs (245) in several of the energy storage pressure regulating structures (240) have their elastic force decreasing sequentially from the outside to the inside. When the equipment is located in water, the pressure in several pressure regulating sealing chambers (220) decreases sequentially from the outside to the inside.

4. The electric submersible slurry pump for vertical shaft shield tunneling machines with a diving depth of 150 meters as described in claim 1, characterized in that, Both the initial sealing chamber (210) and the pressure regulating sealing chamber (220) are equipped with detection tubes (250), and oil-water probes (251) are installed inside the detection tubes (250).

5. The electric submersible slurry pump for vertical shaft shield tunneling machines with a diving depth of 150 meters as described in claim 1, characterized in that, The water inlet passage (110) is provided with a number of filter screens (111), and the mesh size of the filter screens (111) decreases from large to small.

6. The electric submersible slurry pump for vertical shaft shield tunneling machines with a diving depth of 150 meters as described in claim 1, characterized in that, The mechanical seal structure (310) is composed of multiple sealing blocks and adopts a multi-end face sealing method.

7. A special electric submersible slurry pump for vertical shaft shield tunneling machines with a diving depth of 150 meters as described in claim 1, characterized in that, It also includes a motor housing (500), a junction box mounting base (600), a motor cover (700), a stator and rotor (800), and mounting bearings (900); The motor housing (500) is fixedly connected to the adaptive sealing housing (100), the junction box mounting base (600) is fixedly connected to the motor housing (500), the motor cover (700) is fixedly connected to the junction box mounting base (600), the stator rotor (800) is disposed inside the motor housing (500) and coaxial with the pump shaft (300), and the mounting bearing (900) is disposed on the outside of the pump shaft (300).

8. A special electric submersible slurry pump for vertical shaft shield tunneling machines with a diving depth of 150 meters as described in claim 1, characterized in that, The pump body (400) is equipped with a pump cover (410) at one end. The pump cover (410) has an inner flared opening and a T-shaped opening at the bottom, which facilitates connection with equipment or pipelines.

9. A special electric submersible slurry pump for vertical shaft shield tunneling machines with a diving depth of 150 meters as described in claim 1, characterized in that, An impeller (301) is provided at the output end of the pump shaft (300). The impeller (301) is located inside the pump body (400). An impeller (301) lock nut is installed on the axial part of the impeller (301) to restrict the axial movement of the impeller (301).

10. A special electric submersible slurry pump for vertical shaft shield tunneling machines with a diving depth of 150 meters according to claim 7, characterized in that, A cable sleeve (710) is installed on the motor cover (700) for passing cables through.

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