Torque connecting shaft of electric submersible screw pump

Abstract

The embodiment of the utility model provides a torque connecting shaft of an electric submersible screw pump, and relates to the field of oil extraction equipment. A torque connecting shaft of an electric submersible screw pump comprises a connecting pipe and a torque connecting shaft, wherein the torque connecting shaft is sleeved in the connecting pipe. The two ends of the titanium alloy flexible rod are connected to the upper connecting shaft head and the lower connecting shaft head respectively through the thread structures, so that the titanium alloy flexible rod is firmly connected, and during operation, the titanium alloy flexible rod transmits the rotating torque of a motor stator on the lower connecting shaft head; the eccentric operation of the screw pump rotor of the upper connecting shaft head is adjusted to be concentric operation of the lower connecting shaft head, the connecting structure is simple and low in failure rate, meanwhile, mechanical abrasion caused by eccentric rotation is prevented when deviation is adjusted to be concentric through the upper centralizing sleeve and the lower centralizing sleeve, and a stop disc is arranged to prevent the screw pump rotor from being damaged when the screw pump rotates reversely. The motor stator moves upwards, and the stability of the device is improved.

Description

Technical Field

[0001] The utility model relates to the field of oil production equipment, in particular to a torque connecting shaft of an electric submersible screw pump. Background Art

[0002] The screw pump, also known as a progressive positive displacement pump, consists of a stator and a rotor. The spiral interference fit between the two forms a continuously sealed cavity, and the medium is transmitted through the rotation of the rotor. From the end face of the screw pump, the center of the rotor and the center of the stator make an eccentric "revolution" motion, while the rotor and the housing of the motor are concentric, which makes it impossible to connect the motor and the screw pump directly. A structure that can adjust the eccentricity must be used to connect, and at the same time, the axial force generated by the screw pump lifting the well fluid is transmitted to the housing.

[0003] In the prior art, a universal joint is usually used to connect the flexible rod. However, the conventional universal joint flexible shaft has a complicated structure. When the motor stator shaft is connected, the screw pump is reversed, the motor stator moves upward and the entire device vibrates up and down, which can easily loosen various parts and reduce the stability of the device. Utility Model Content

[0004] The utility model aims to provide a torque connecting shaft of an electric submersible screw pump, which has a simple connecting structure and a low failure rate, and can prevent the motor stator from moving upward when the screw pump is reversed, thereby improving the stability of the device.

[0005] The embodiment of the utility model provides a torque connecting shaft of an electric submersible screw pump, comprising a connecting pipe and a torque connecting shaft.

[0006] The connecting pipe comprises a long connecting pipe and a stator connecting pipe, wherein the stator connecting pipe is located below the long connecting pipe, and a connecting shaft is arranged inside the stator connecting pipe;

[0007] The torque connecting shaft includes an upper connecting shaft head, a lower connecting shaft head, a titanium alloy flexible rod and a stabilizer. The two ends of the titanium alloy flexible rod are respectively connected to the upper connecting shaft head and the lower connecting shaft head through threads, and the port of the upper connecting shaft head is connected to the screw pump rotor. The lower connecting shaft head is connected to one end of the connecting shaft through an upper straightening sleeve. The stabilizer is arranged below the stator connecting pipe. A connecting rod is arranged in the stabilizer. The connecting rod is connected to the other end of the connecting shaft through a lower straightening sleeve. A stop plate is arranged around the connecting shaft, and the upper part of the stabilizer abuts against the stop plate.

[0008] In a specific embodiment, a suction port is provided above the long connecting pipe.

[0009] In a specific embodiment, a nut is sleeved under the stop plate, the stop plate is fastened by the nut, and the upper part of the centralizer abuts against the nut.

[0010] In a specific embodiment, the centralizer end of the connecting shaft is connected to the stator output end of the motor.

[0011] In a specific embodiment, the diameter of the upper connecting shaft head is larger than the diameter of the titanium alloy flexible rod, and the diameter of the lower connecting shaft head is larger than the diameter of the titanium alloy flexible rod.

[0012] In a specific implementation, a sealing ring is sleeved on the upper side of the lower connecting shaft head.

[0013] The beneficial effects of a torque connecting shaft of an electric submersible screw pump provided by an embodiment of the utility model are as follows: the two ends of the titanium alloy flexible rod are respectively connected to the upper connecting shaft head and the lower connecting shaft head through a threaded structure, so that the titanium alloy flexible rod is connected and tightened. When operating, the titanium alloy flexible rod transmits the rotational torque of the motor stator on the lower connecting shaft head, and adjusts the eccentric operation of the screw pump rotor on the upper connecting shaft head to concentric operation on the lower connecting shaft head. The connection structure is relatively simple and has a low failure rate. At the same time, when the eccentricity is adjusted to concentricity through the upper and lower straightening sleeves, mechanical wear caused by eccentric rotation is prevented, and a stop plate is provided to prevent the motor stator from moving upward when the screw pump is reversed, thereby improving the stability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 It is a schematic structural diagram of a torque connecting shaft of an electric submersible screw pump according to an embodiment of the utility model.

[0016] Figure 2 It is a cross-sectional view of a torque connection shaft of an electric submersible screw pump according to an embodiment of the utility model.

[0017] Icons: 100-connecting pipe; 110-long connecting pipe; 120-stator connecting pipe; 130-connecting shaft; 140-intake port; 200-torque connecting shaft; 210-upper connecting shaft head; 220-lower connecting shaft head; 221-sealing ring; 230-titanium alloy flexible rod; 240-centralizer; 250-connecting rod; 260-upper centralizing sleeve; 270-lower centralizing sleeve; 280-stop plate; 290-nut; DETAILED DESCRIPTION

[0018] In the prior art, a universal joint is usually used to connect the flexible rod, but the conventional universal joint flexible shaft has a complex structure, and when connected to the motor stator shaft, the overall device vibrates up and down, which easily loosens the parts and reduces the stability of the device, which is insufficient. The connection structure is simple, the failure rate is reduced, and at the same time, when the screw pump is reversed, the motor stator can be prevented from moving upward, thereby improving the stability of the device.

[0019] In conjunction with the accompanying drawings, some embodiments of the present invention are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0020] Please refer to Figure 1 The embodiment of the utility model provides a torque connecting shaft of an electric submersible screw pump, comprising a connecting pipe 100 and a torque connecting shaft 200. The torque connecting shaft 200 is sleeved in the connecting pipe 100.

[0021] Please refer to Figure 2 The connecting pipe 100 includes a long connecting pipe 110 and a stator connecting pipe 120. The stator connecting pipe 120 is located below the long connecting pipe 110. A connecting shaft 130 is disposed in the stator connecting pipe 120.

[0022] The torque connecting shaft 200 includes an upper connecting shaft head 210, a lower connecting shaft head 220, a titanium alloy flexible rod 230 and a stabilizer 240. The two ends of the titanium alloy flexible rod 230 are respectively connected to the upper connecting shaft head 210 and the lower connecting shaft head 220 through threads, and the port of the upper connecting shaft head 210 is connected to the screw pump rotor. The lower connecting shaft head 220 is connected to one end of the connecting shaft 130 through an upper straightening sleeve 260. The stabilizer 240 is arranged below the stator connecting pipe 120. A connecting rod 250 is arranged in the stabilizer 240. The connecting rod 250 is connected to the other end of the connecting shaft 130 through a lower straightening sleeve 270. A stop plate 280 is arranged around the connecting shaft 130, and the upper part of the stabilizer 240 is against the stop plate 280. The two ends of the titanium alloy flexible rod 230 are respectively connected to the upper connecting shaft head 210 and the lower connecting shaft head 220 through a threaded structure, so that the titanium alloy flexible rod 230 is connected and tightened. When operating, the titanium alloy flexible rod 230 transmits the rotational torque of the motor stator on the lower connecting shaft head 220, and adjusts the eccentric operation of the screw pump rotor on the upper connecting shaft head 210 to concentric operation on the lower connecting shaft head 220. The connection structure is relatively simple and has a low failure rate. At the same time, the upper and lower straightening sleeves 260 and 270 are used to adjust the eccentricity to concentricity to prevent mechanical wear caused by eccentric rotation, and a stop plate 280 is provided to prevent the motor stator from moving upward when the screw pump is reversed, thereby improving the stability of the device.

[0023] In one embodiment, a suction port 140 is provided above the long connecting pipe 110. When operating, the screw pump rotates continuously, and the fluid is sucked into the pump through the suction port 140 for collection. A nut 290 is sleeved below the stop disk 280, and the stop disk 280 is tightened by the nut 290, and the upper part of the stabilizer 240 abuts against the nut 290. The stop disk 280 prevents the motor stator from moving upward, and the stop disk 280 is tightened by the nut 290. The stabilizer 240 end of the connecting shaft 130 is connected to the stator output end of the motor. The diameter of the upper connecting shaft head 210 is greater than the diameter of the titanium alloy flexible rod 230, and the diameter of the lower connecting shaft head 220 is greater than the diameter of the titanium alloy flexible rod 230. A sealing ring 221 is sleeved above the lower connecting shaft head 220. The sealing ring 221 prevents debris from entering the connecting piece.

[0024] In summary, the working principle of the torque connecting shaft of an electric submersible screw pump in an embodiment of the utility model is as follows: the two ends of the titanium alloy flexible rod 230 are respectively connected to the upper connecting shaft head 210 and the lower connecting shaft head 220 through a threaded structure, so that the titanium alloy flexible rod 230 is connected and tightened. When operating, the titanium alloy flexible rod 230 transmits the rotational torque of the motor stator on the lower connecting shaft head 220, and adjusts the eccentric operation of the screw pump rotor on the upper connecting shaft head 210 to the concentric operation on the lower connecting shaft head 220. The straightener 240 plays a guiding and straightening role in the process of going down the well. The connection structure is relatively simple and has a low failure rate. At the same time, the upper straightening sleeve 260 and the lower straightening sleeve 270 are used to adjust the deflection to concentricity to prevent mechanical wear caused by eccentric rotation. The stop plate 280 is used to prevent the motor stator from moving upward. The stop plate 280 is tightened by the nut 290 to prevent the motor stator from moving upward when the screw pump is reversed, thereby improving the stability of the device.

[0025] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and ratio of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangements, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present utility model. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the present invention is not limited to a specific embodiment, but extends to various modifications that still fall within the scope of the appended claims.

[0026] Additionally, in order to provide a concise description of example embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0027] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0028] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A torque connection shaft of an electric submersible screw pump, characterized in that: include A connecting pipe (100), the connecting pipe (100) comprising a long connecting pipe (110) and a stator connecting pipe (120), the stator connecting pipe (120) being located below the long connecting pipe (110), and a connecting shaft (130) being arranged inside the stator connecting pipe (120); A torque connecting shaft (200), the torque connecting shaft (200) comprising an upper connecting shaft head (210), a lower connecting shaft head (220), a titanium alloy flexible rod (230) and a centralizer (240), the two ends of the titanium alloy flexible rod (230) being connected to the upper connecting shaft head (210) and the lower connecting shaft head (220) respectively through threads, and the port of the upper connecting shaft head (210) being connected to the screw pump rotor, and the lower connecting shaft head (220) being connected to the screw pump rotor through an upper centralizer sleeve (260) is connected to one end of the connecting shaft (130), the centralizer (240) is arranged below the stator connecting tube (120), a connecting rod (250) is arranged inside the centralizer (240), the connecting rod (250) is connected to the other end of the connecting shaft (130) through a lower centralizing sleeve (270), a stop plate (280) is arranged around the connecting shaft (130), and the upper part of the centralizer (240) is against the stop plate (280).

2. The torque connecting shaft of an electric submersible screw pump according to claim 1, characterized in that: A suction port (140) is provided above the long connecting pipe (110).

3. The torque connection shaft of an electric submersible screw pump according to claim 1, characterized in that: A nut (290) is sleeved below the stop plate (280), and the stop plate (280) is fastened by the nut (290). The upper part of the centralizer (240) abuts against the nut (290).

4. The torque connection shaft of an electric submersible screw pump according to claim 1, characterized in that: The centralizer (240) end of the connecting shaft (130) is connected to the stator output end of the motor.

5. The torque connection shaft of an electric submersible screw pump according to claim 4, characterized in that: The diameter of the upper connecting shaft head (210) is greater than the diameter of the titanium alloy flexible rod (230), and the diameter of the lower connecting shaft head (220) is greater than the diameter of the titanium alloy flexible rod (230).

6. The torque connection shaft of an electric submersible screw pump according to claim 1, characterized in that: A sealing ring (221) is sleeved on the upper side of the lower connecting shaft head (220).

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