High-performance screw pump stator device

Abstract

The utility model relates to a high-performance screw pump stator device which comprises a plurality of key pins, a plastic lining made of engineering plastics, an inner spiral hole arranged inside the plastic lining and a plurality of outer key grooves arranged outside the plastic lining. The two end connecting pipes are arranged at the two ends of the plastic lining, a plurality of first key grooves are formed in the end connecting pipes, pipe threads are arranged at one ends, and first connecting threads are arranged at the other ends; the middle connecting pipes are arranged on the plastic lining in a sleeving mode and located between the two end connecting pipes, second key grooves are formed in the middle connecting pipes, and second connecting threads are arranged at the two ends of each middle connecting pipe; second connecting threads are arranged at the two ends of each outer sleeve, and the outer sleeves are arranged on the plastic liners in a sleeving mode and located between the end connecting pipes and the middle connecting pipes and between every two adjacent middle connecting pipes correspondingly; the connecting screw sleeves are respectively connected with the outer sleeve, the end connecting pipes and the middle connecting pipes; the key pin is connected with the first key groove and the outer key groove and connected with the second key groove and the outer key groove. The lining of the stator device of the screw pump has certain hardness and toughness, so that the lifting lift can be improved, meanwhile, degumming and tearing are not prone to occurring, the pump efficiency is good, and the transmission torque is small.

Description

Technical Field

[0001] The utility model relates to a screw pump, in particular to a high-performance screw pump stator device. Background Art

[0002] Downhole screw pumps are used in oilfield oil extraction lifting equipment. At present, the stator lining of downhole screw pumps is mainly made of vulcanized rubber material. In daily use, vulcanized rubber materials often have problems such as detachment of the adhesive between the rubber and the outer jacket. These phenomena cause the pump to get stuck and the downhole tools to be damaged, resulting in high operating costs and affecting production capacity.

[0003] The medium in conventional oil wells usually contains a certain amount of solid particles (such as quartz sand, etc.). The rubber lining and the rotor have a large interference fit, and it is easy for gravel to be sandwiched between the rotor and the stator. The torque generated during operation is also large. Since the rubber lining is relatively soft, it is very easy to tear and damage. In addition, when the downhole liquid level is low or the oil well is short of fluid supply, as the lifting height increases, the rubber lining is affected by the pressure of the pipe column, and the deformation increases, the torque increases, the pump efficiency drops sharply, and the pump hanging depth is limited, which restricts the application scope of the screw pump in oil well lifting. Utility Model Content

[0004] In order to solve the above problems, the utility model provides a high-performance screw pump stator device, and the specific technical solution is as follows:

[0005] A high-performance screw pump stator device includes a plurality of key pins and also includes: a plastic liner made of engineering plastic, wherein the interior of the plastic liner is provided with an internal spiral hole and the exterior is provided with a plurality of external key grooves; two end pipes are arranged at the two ends of the plastic liner, wherein the interior of the end pipe is provided with a plurality of first key grooves, one end of the end pipe is provided with a pipe thread, and the other end is provided with a first connecting thread; a plurality of intermediate pipes are sleeved on the plastic liner and located between the two end pipes, wherein the interior of the intermediate pipe is provided with a second key groove, and both ends are provided with a second connecting thread; a plurality of outer sleeves are provided with a second connecting thread at both ends, wherein the outer sleeves are sleeved on the plastic liner and are respectively located between the end pipe and the intermediate pipe and between two adjacent intermediate pipes; and a plurality of connecting screw sleeves are respectively connected to the outer sleeve, the end pipe and the intermediate pipe; wherein the key pins are respectively connected to the first key groove and the external key groove and to the second key groove and the external key groove.

[0006] Preferably, the other end of the end connecting pipe is provided with a first connecting groove, both ends of the middle connecting pipe are provided with a second connecting groove, and both ends of the outer sleeve are provided with a first connecting protrusion, and the first connecting protrusion is used to be installed in the first connecting groove and the second connecting groove.

[0007] Preferably, it also includes locking nuts, which are arranged at both ends of the connecting nut.

[0008] Compared with the prior art, the utility model has the following beneficial effects:

[0009] The utility model provides a high-performance screw pump stator device which adopts a plastic lining made of engineering plastics to replace a rubber lining, so that the lining has a certain hardness and toughness, which can improve the lifting head and is not easy to debond and tear, and improves the pump efficiency, reduces the transmission torque, and reduces energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the structure of this application;

[0011] Figure 2 It is a schematic diagram of the structure of the end pipe;

[0012] Figure 3 It is the front view of the end nozzle;

[0013] Figure 4 It is a structural diagram of the intermediate pipe;

[0014] Figure 5 It is a schematic diagram of the structure of the outer sleeve;

[0015] Figure 6 is a front view of the outer sleeve;

[0016] Figure 7 It is a schematic diagram of the structure of the plastic lining;

[0017] Figure 8 is a front view of the plastic liner;

[0018] Fig. 9 It is a structural schematic diagram of the connecting screw sleeve;

[0019] Fig.10 It is a schematic diagram of the structure of the locking nut. DETAILED DESCRIPTION

[0020] The utility model is now further described with reference to the accompanying drawings.

[0021] like Figures 1 to 10As shown, a high-performance screw pump stator device includes a key pin 7, a plastic liner 6, an end pipe 1, an intermediate pipe 2, an outer sleeve 3 and a connecting screw sleeve 4. The plastic liner 6 is made of engineering plastic, and an inner spiral hole 61 is provided inside the plastic liner 6, and four outer key grooves 62 are provided in an outer annular array; two end pipes 1 are provided, and the end pipes 1 are installed at both ends of the plastic liner 6. Four first key grooves 11 are provided inside the end pipe 1, and one end of the end pipe 1 is provided with a pipe thread 13, and the other end is provided with a first connecting thread 12 and a first connecting groove 14; a plurality of intermediate pipes 2 are provided, and the intermediate pipes 2 are sleeved on the plastic liner 6, and The outer sleeve 3 is provided with a plurality of outer sleeves 3, and the outer sleeve 3 is provided with a third connecting thread 31 and a first connecting protrusion 32 at both ends. The outer sleeve 3 is sleeved on the plastic liner 6. The outer sleeve 3 is respectively located between the end pipe 1 and the middle pipe 2 and between two adjacent middle pipes 2. The first connecting protrusion 32 of the outer sleeve 3 is inserted into the first connecting groove 14 and the second connecting groove 23. The first connecting groove 14, the second connecting groove 23 and the first connecting protrusion 32 match. The connecting screw sleeve 4 is provided with a plurality of inner threads. The connecting screw sleeve 4 is respectively connected with the third connecting thread 31 of the outer sleeve 3, the first connecting thread 12 of the end pipe 1 and the second connecting thread 22 of the middle pipe 2 through threads. The key pin 7 is respectively connected with the first key groove 11 and the outer key groove 62 and the second key groove 21 and the outer key groove 62.

[0022] In order to prevent loosening, locking nuts 5 are also included. The locking nuts 5 are respectively located at both ends of the connecting screw sleeve 4. The locking nuts 5 are installed at the ends of the end pipe 1, the middle pipe 2 and the outer sleeve 3 through internal threads, and are pressed on the connecting screw sleeve 4 to prevent the connecting screw sleeve 4 from rotating, thereby improving the reliability and stability of the connection.

[0023] The inner lining is made of engineering plastics, and the plastic lining 6 has a certain hardness and toughness. The inner spiral hole 61 is processed by a mechanical chip forming process to improve the application of the existing downhole screw pump at a higher lifting head, overcome the defects of the screw pump stator degumming with vulcanized rubber as the liner in the past, and can improve the pump efficiency and reduce the transmission torque, so as to better adapt to the lifting needs of the oil well screw pump, effectively improve the lifting efficiency of the screw pump and reduce the energy consumption of the screw pump system.

[0024] The key pin 7 can prevent the plastic liner 6 from rotating.

[0025] The key pin 7 is connected to transmit the rotation torque and overcome the defect of the vulcanized rubber liner and the stator outer tube being easy to debond due to adhesion.

[0026] The plastic liner 6 is processed into an inner spiral hole 61 through a mechanical chip cutting process, which can accurately control the geometric dimensions, achieve the minimum interference or use clearance fit, reduce the transmission torque, effectively reduce the sand jam and rubber tearing problems, and reduce the energy consumption of the screw pump system.

[0027] Compared with the rubber liner, the plastic liner 6 has higher hardness and pressure bearing capacity, which overcomes the problem of the rubber liner being deformed under pressure at high lift, improves the pump efficiency, and breaks through the limitation of the pump hanging depth of the previous vulcanized rubber liner stator within a certain range.

[0028] The technical principle of the present invention is described above in combination with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the protection scope of the present invention in any way. Based on the explanations here, technicians in this field can think of other specific implementation methods of the present invention without creative work, and these methods will fall within the protection scope of the claims of the present invention.

Claims

1. A high-performance screw pump stator device, comprising a plurality of key pins (7), characterized in that: Also includes: A plastic liner (6) made of engineering plastic is used, wherein the interior of the plastic liner (6) is provided with an inner spiral hole (61) and the exterior is provided with a plurality of outer key grooves (62); Two end pipes (1) are arranged at both ends of the plastic liner (6), a plurality of first key grooves (11) are arranged inside the end pipes (1), one end of the end pipes (1) is provided with a pipe thread (13), and the other end is provided with a first connecting thread (12); A plurality of intermediate pipes (2) are sleeved on the plastic liner (6) and located between the two end pipes (1); a second keyway (21) is provided inside the intermediate pipe (2) and second connecting threads (22) are provided at both ends; A plurality of outer sleeves (3), both ends of which are provided with third connecting threads (31), the outer sleeves (3) being sleeved on the plastic liner (6) and respectively located between the end pipe (1) and the middle pipe (2) and between two adjacent middle pipes (2); and A plurality of connecting screw sleeves (4) are respectively connected to the outer sleeve (3), the end connecting pipe (1) and the middle connecting pipe (2); Wherein, the key pin (7) is respectively connected to the first key groove (11) and the outer key groove (62), and is also connected to the second key groove (21) and the outer key groove (62).

2. A high-performance screw pump stator device according to claim 1, characterized in that: The other end of the end pipe (1) is provided with a first connecting groove (14), both ends of the middle pipe (2) are provided with second connecting grooves (23), and both ends of the outer sleeve (3) are provided with first connecting protrusions (32), and the first connecting protrusions (32) are used to be installed in the first connecting groove (14) and the second connecting groove (23).

3. A high-performance screw pump stator device according to claim 1, characterized in that: It also includes locking nuts (5) which are arranged at both ends of the connecting nut sleeve (4).

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