High-temperature acid-proof submersible centrifugal pump

Abstract

The utility model discloses a high temperature acid -proof submerged oil centrifugal pump, including the pump body, the outer surface of pump body is equipped with the suction module, the inside of pump body is equipped with the pump shaft, the outer surface of pump shaft is equipped with the impeller module, the inside of pump body is equipped with the sealing module, the outer surface of pump body is equipped with motor connection subassembly. The device adopts the dynamic ring and static ring combination seal of silicon carbide material, cooperates the hastelloy alloy compensation spring, forms the dynamic compensation sealing surface, utilizes the acid corrosion resistance and high temperature stability of silicon carbide, cooperates the compensation spring and continuously exerts the axial pressure, and the automatic compensation sealing surface wear and tear, prolongs the life of sealing, can effectively solve the problem that the traditional alloy seal is easy to acid -etching, heat deformation leads to the leakage, and simultaneously the pump body of the equipment adopts duplex stainless steel material, cooperates the tungsten carbide wear -resisting ring of impeller module and is equipped with, through duplex stainless steel and austenite and ferrite structure, can resist chloride ion corrosion, is applicable to high salt content oil well environment.

Description

Technical Field

[0001] This utility model relates to the field of oil extraction equipment technology, and in particular to a high-temperature acid-resistant submersible centrifugal pump. Background Technology

[0002] Against the backdrop of continuous growth in global energy demand, oil, as an important energy resource, faces many complex and severe challenges in its extraction. As shallow and easily exploitable oil resources gradually decrease, oil extraction operations have to expand into deeper and more complex geological environments. Among these, high-temperature and high-acid reservoir environments are increasingly becoming the focus and difficulty of extraction.

[0003] Currently, when traditional submersible centrifugal pumps operate in oil wells with high temperatures and strong acidic media such as hydrogen sulfide, the sealing components are prone to failure due to acid corrosion and thermal deformation, leading to pump leakage and shortened lifespan. Furthermore, many existing mechanical seals use a single alloy material, which is difficult to meet the requirements of acid resistance and high-temperature stability at the same time. Therefore, we propose a high-temperature acid-resistant submersible centrifugal pump to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a high-temperature acid-resistant submersible centrifugal pump to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A high-temperature acid-resistant submersible centrifugal pump includes a pump body, an suction module on the outer surface of the pump body, a pump shaft inside the pump body, an impeller module on the outer surface of the pump shaft, a sealing module inside the pump body, a motor connection assembly on the outer surface of the pump body, and an outlet on the outer surface of the pump body.

[0007] In a further embodiment, the inhalation module includes a conical filter screen, an anti-rotation groove is provided on the outer surface of the inhalation module, and a sealing ring is provided on the outer surface of the inhalation module.

[0008] In a further embodiment, the outer surface of the impeller module is provided with a wear-resistant ring, the outer surface of the wear-resistant ring is in close contact with the outer surface of the pump shaft, the outer surface of the pump shaft is provided with a locking thread, and the outer surface of the pump shaft is threadedly connected to the impeller locking nut through the locking thread.

[0009] In a further embodiment, the sealing module includes a rotating ring, the inner ring of which is tightly fitted to the outer surface of the pump shaft, and a stationary ring is provided inside the pump body. The outer surface of the stationary ring is in contact with the end face of the rotating ring to form a sealing surface, and a set of grooves is formed on the outer surface of the rotating ring.

[0010] In a further embodiment, each groove is provided with a compensating spring inside, the pump body is provided with a sealing end cap inside, the end of each compensating spring away from the stationary ring is tightly fitted with the outer surface of the sealing end cap, the outer surface of the sealing end cap is provided with a set of fixing holes, the outer surface of the pump body is provided with a set of mounting holes, each mounting hole is provided with a fastening bolt inside, and the size of each fastening bolt is adapted to the fixing hole.

[0011] In a further embodiment, the motor connection assembly includes a spline coupling, the outer surface of the pump body is provided with a flange mating plate, the outer surface of the flange mating plate is provided with a sealing groove, and the interior of the sealing groove is provided with a sealing ring.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] This device employs a combination seal of silicon carbide dynamic and static rings, coupled with a Hastelloy compensating spring, to form a dynamic compensating sealing surface. Utilizing the acid corrosion resistance and high-temperature stability of silicon carbide, and with the continuous application of axial pressure by the compensating spring, it automatically compensates for seal surface wear, extending seal life. This effectively solves the problems of traditional alloy seals being prone to acid corrosion and leakage due to thermal deformation. Simultaneously, the pump body is made of duplex stainless steel, paired with a tungsten carbide wear-resistant ring on the impeller module. The duplex stainless steel, with its austenitic and ferritic structure, is resistant to chloride ion corrosion and suitable for high-salt oil well environments. Furthermore, the wear-resistant ring effectively reduces frictional wear between the pump shaft and impeller, effectively preventing equipment failure due to high-temperature expansion. Attached Figure Description

[0014] Figure 1 This is a bottom view of the structure of a high-temperature acid-resistant submersible centrifugal pump.

[0015] Figure 2 This is a top view of the structure of a high-temperature acid-resistant submersible centrifugal pump.

[0016] Figure 3 This is a schematic diagram of the front section structure of a high-temperature acid-resistant submersible centrifugal pump.

[0017] Figure 4 For high-temperature acid-resistant submersible centrifugal pumps Figure 3 A magnified structural diagram of part A in the middle.

[0018] In the diagram: 1. Pump body; 101. Mounting hole; 102. Fastening bolt; 2. Suction module; 201. Conical filter screen; 202. Anti-rotation groove; 203. Sealing ring; 3. Motor connection assembly; 301. Spline coupling; 302. Flange mating plate; 303. Sealing groove; 304. Sealing ring; 4. Sealing module; 401. Dynamic ring; 402. Stationary ring; 403. Sealing end cover; 404. Fixing hole; 405. Compensating spring; 406. Groove; 5. Outlet; 6. Pump shaft; 7. Impeller module; 701. Wear-resistant ring; 702. Locking thread; 703. Impeller lock nut. Detailed Implementation

[0019] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0020] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figure 1-4This utility model discloses a high-temperature acid-resistant submersible centrifugal pump, comprising a pump body 1, a suction module 2 on the outer surface of the pump body 1, a pump shaft 6 inside the pump body 1, an impeller module 7 on the outer surface of the pump shaft 6, a conical filter screen 201, an anti-rotation groove 202 on the outer surface of the suction module 2, a sealing ring 203 on the outer surface of the suction module 2, a wear-resistant ring 701 on the outer surface of the impeller module 7, the outer surface of the wear-resistant ring 701 being tightly fitted with the outer surface of the pump shaft 6, a locking thread 702 on the outer surface of the pump shaft 6, and an impeller locking nut 703 threadedly connected to the outer surface of the pump shaft 6 via the locking thread 702. The pump body 1 adopts an integral corrosion-resistant structure, with the suction module 2 integrated at its bottom, and a precision-machined pump shaft 6 mounting cavity inside, and markings on its outer surface. The standardized mounting hole 101 is used for modular assembly. The suction module 2 consists of a conical filter 201, an anti-vortex groove 202, and a sealing ring 203. The conical filter 201 adopts a multi-layer stainless steel woven structure to achieve high-efficiency filtration. The anti-vortex groove 202 eliminates fluid vortices through a spiral flow guiding design. The sealing ring 203 is made of fluororubber to effectively ensure the sealing of the interface. The pump shaft 6 is made of high-strength alloy steel and is integrally forged. Its surface is precision machined with locking threads 702. The shaft body undergoes a special heat treatment process to improve torsional strength and corrosion resistance. The impeller module 7 includes a wear-resistant ring 701 and an impeller locking nut 703. The wear-resistant ring 701 adopts a tungsten carbide coating and is interference-fitted with the pump shaft 6 to reduce wear. The locking nut achieves axial positioning and anti-loosening protection of the impeller through a precision thread connection.

[0023] The pump body 1 has a sealing module 4 inside, which includes a rotating ring 401. The inner ring of the rotating ring 401 is tightly fitted to the outer surface of the pump shaft 6. The pump body 1 also has a stationary ring 402 inside, whose outer surface is in contact with the end face of the rotating ring 401 to form a sealing surface. The outer surface of the rotating ring 401 has a set of grooves 406, and each groove 406 has a compensating spring 405 inside. The pump body 1 also has a sealing end cover 403 inside, and the end of each compensating spring 405 away from the stationary ring 402 is tightly fitted to the outer surface of the sealing end cover 403. The outer surface of the sealing end cover 403 has a set of fixing holes 404. A set of mounting holes 101 are provided on the outer surface of the pump body 1. Each mounting hole 101 is equipped with a fastening bolt 102. The size of each fastening bolt 102 is adapted to the fixing hole 404. The rotating ring 401 is made of silicon carbide. The inner ring is precisely fitted with the pump shaft 6. The outer surface has equally spaced grooves 406 for installing the compensation spring 405. At the same time, the stationary ring 402 and the end face of the rotating ring 401 form the main sealing pair. The sealing ring 405 is made of Hastelloy helical spring, which will provide constant axial pressure and automatically compensate for the wear of the sealing surface. The sealing end cover 403 is fixed to the pump body 1 by the fastening bolt 102.

[0024] The outer surface of the pump body 1 is provided with a motor connection assembly 3, and the outer surface of the pump body 1 is provided with an outlet 5. The motor connection assembly 3 includes a spline coupling 301. The outer surface of the pump body 1 is provided with a flange mating plate 302. The outer surface of the flange mating plate 302 is provided with a sealing groove 303. The sealing groove 303 is provided with a sealing ring 304. The spline coupling 301 adopts an involute spline design, which allows for slight axial floating. The flange mating plate 302 adopts a standard flange structure. At the same time, the sealing groove 303 is embedded with a PTFE sealing ring 304 to achieve double sealing protection. The flow channel of the outlet 5 adopts a gradually expanding hydraulic design. The diameter of the outlet 5 is gradually increased, which can effectively reduce the loss of fluid kinetic energy.

[0025] The working principle of this utility model is as follows:

[0026] When the equipment is in use, the motor first drives the pump shaft 6 to rotate through the spline coupling 301, which drives the impeller module 7 to rotate at high speed. Under the filtration of the conical filter screen 201 of the suction module 2, the oil enters the pump body 1 from the bottom, is pressurized by the impeller, and is discharged through the outlet 5. The dynamic ring 401 and the stationary ring 402 of the sealing module 4 are tightly fitted to prevent leakage. The compensation spring 405 will continuously compensate for the wear of the sealing surface. At the same time, the flange of the motor connection assembly 3 and the plate 302 can ensure stable power transmission. The wear-resistant ring 701 is used in conjunction with the impeller locking nut 703 to fix the position of the impeller, and finally the high-temperature acidic oil is efficiently transported.

[0027] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0028] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A high-temperature acid-resistant submersible centrifugal pump, characterized in that: The pump body (1) includes a suction module (2) on its outer surface, a pump shaft (6) inside the pump body (1), an impeller module (7) on the outer surface of the pump shaft (6), a sealing module (4) inside the pump body (1), a motor connection assembly (3) on the outer surface of the pump body (1), and an outlet (5) on the outer surface of the pump body (1).

2. The high-temperature acid-resistant submersible centrifugal pump according to claim 1, characterized in that: The inhalation module (2) includes a conical filter (201), an anti-rotation groove (202) is provided on the outer surface of the inhalation module (2), and a sealing ring (203) is provided on the outer surface of the inhalation module (2).

3. The high-temperature acid-resistant submersible centrifugal pump according to claim 1, characterized in that: The outer surface of the impeller module (7) is provided with a wear-resistant ring (701), the outer surface of the wear-resistant ring (701) is in close contact with the outer surface of the pump shaft (6), the outer surface of the pump shaft (6) is provided with a locking thread (702), and the outer surface of the pump shaft (6) is threadedly connected to the impeller locking nut (703) through the locking thread (702).

4. A high-temperature acid-resistant submersible centrifugal pump according to claim 1, characterized in that: The sealing module (4) includes a rotating ring (401), the inner ring of which is in close contact with the outer surface of the pump shaft (6), and a stationary ring (402) is provided inside the pump body (1). The outer surface of the stationary ring (402) is in contact with the end face of the rotating ring (401) to form a sealing surface, and a set of grooves (406) are provided on the outer surface of the rotating ring (401).

5. A high-temperature acid-resistant submersible centrifugal pump according to claim 4, characterized in that: Each groove (406) is provided with a compensating spring (405) inside, and the pump body (1) is provided with a sealing end cap (403) inside. The end of each compensating spring (405) away from the stationary ring (402) is tightly fitted with the outer surface of the sealing end cap (403). The outer surface of the sealing end cap (403) is provided with a set of fixing holes (404), and the outer surface of the pump body (1) is provided with a set of mounting holes (101). Each mounting hole (101) is provided with a fastening bolt (102) inside, and the size of each fastening bolt (102) is adapted to the fixing hole (404).

6. A high-temperature acid-resistant submersible centrifugal pump according to claim 1, characterized in that: The motor connection assembly (3) includes a spline coupling (301), and the outer surface of the pump body (1) is provided with a flange mating plate (302). The outer surface of the flange mating plate (302) is provided with a sealing groove (303), and the interior of the sealing groove (303) is provided with a sealing ring (304).

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