All-metal conical combined screw pump suitable for petroleum field

Abstract

An all-metal conical combined screw pump suitable for petroleum field includes: a stator, a rotor (2), a sleeve (3) and a sucker rod (4), wherein the internal threaded curved surface and the external threaded curved surface are both tapered The spiral structure and the taper are the same, and the end of the inner threaded surface and the outer threaded surface with the larger radial size is adjacent to the sucker rod; the all-metal conical combined screw pump further comprises an elastic telescopic component, wherein the elastic telescopic component comprises a movable part, a fixed part and a elastic part, the movable part is fixedly connected to the rotor, the fixed part is fixedly connected to the sucker rod, the movable part and the fixed part are slidly fitted in the up and down directions and can be To transmit torque to the sucker rod and the rotor, one end of the elastic member abuts against the movable part or the rotor, and the other end abuts against the fixed part or the sucker rod, the elastic member can Elastic contraction or elastic expansion along the sliding direction of the movable part.

Claims

1. An all-metal conical combined screw pump suitable for petroleum field comprising: a stator, a rotor, a sleeve and a sucker rod; wherein the stator is provided with an internally threaded curved surface, and the rotor is installed in the stator and is provided with An external threaded curved surface matched with an internal threaded curved surface, the sleeve is connected to the stator, and the sucker rod is installed in the sleeve, characterized in that: the internal threaded curved surface and the external threaded curved surface are both tapered The spiral structure and the taper are the same, and the end of the inner threaded surface and the outer threaded surface with the larger radial size is adjacent to the sucker rod; the all-metal conical combined screw pump further comprises an elastic telescopic assembly, the elastic telescopic assembly comprising a movable part, a fixed part and an elastic part, the movable part is fixedly connected to the rotor, the fixed part is fixedly connected to the sucker rod, the movable part and the fixed part are slidly fitted in the up and down directions and can transmit torque to the sucker rod and the rotor, one end of the elastic member abuts against the movable part or the rotor, and the other end abuts against the fixed part or the sucker rod, the elastic member can be elastically contracted or elastically expanded along the sliding direction of the movable part.

2. The all-metal conical combined screw pump suitable for petroleum field, as recited in claim 1, wherein the movable part is a connecting shaft, the fixed part is a connecting seat, the elastic part is a spring, the elastic telescopic assembly further comprises a limiting component, the connecting shaft is inserted into the cavity of the connecting seat, so The connecting shaft can move along the axis of the connecting seat and can transmit torque by cooperating with the connecting seat, the spring is sleeved on the connecting shaft and/or the connecting seat, and one end of the spring abuts against the connecting seat or the sucker rod, the other end abuts against the connecting shaft or the rotor, and the limiting component is used to prevent the connecting shaft from separating from the connecting seat.

3. The all-metal conical combined screw pump suitable for petroleum field, as recited in claim 2, The end of the rotor adjacent to the connecting shaft is connected with a first threaded joint, the end of the connecting shaft adjacent to the rotor is connected with a second threaded joint, the first threaded joint and the second thread are connected by a threaded sleeve; the connecting seat is integrally formed or fixedly installed on the sucker rod.

4. The all-metal conical combined screw pump suitable for petroleum field, as recited in claim 2, wherein the connecting shaft is provided with a step that cooperates with the position limit of a limit plate.

5. The all-metal conical combined screw pump suitable for petroleum field, as recited in claim 1, wherein the movable part is a connecting seat, the fixed part is a connecting shaft, the elastic part is a spring, the elastic telescopic assembly further comprises a limiting component, the connecting shaft is inserted into the cavity of the connecting seat, so The connecting shaft can move along the axis of the connecting seat and can transmit torque by cooperating with the connecting seat; the spring is sleeved on the connecting shaft and/or the connecting seat, and one end of the spring abuts against the connecting seat or the rotor, and the other end abuts against the connecting shaft or the sucker rod, and the limiting component is used to prevent the connecting shaft from separating from the connecting seat.

6. The all-metal conical combined screw pump suitable for petroleum field, as recited in claim 2 or 5, wherein the limiting component comprises a first outer flange and a limit plate that are in a limit fit, and the first outer flange is connected to the end of the connecting shaft adjacent to the connecting seat and protrudes outward in the diameter direction; the limit plate is connected to the end of the connecting seat adjacent to the connecting shaft and protrudes inward along the diameter direction.

7. The all-metal conical combined screw pump suitable for petroleum field, as recited in claim 6, wherein the end of the connecting shaft adjacent to the first outer flange is provided with external teeth, the limit plate is provided with internal teeth, and the external teeth mesh with the internal teeth.

8. The all-metal conical combined screw pump suitable for petroleum field, as recited in claim 6, the first outer flange is provided with external teeth, the cavity is provided with internal teeth, and the external teeth mesh with the internal teeth.

9. The all-metal conical combined screw pump suitable for petroleum field, as recited in claim 1, wherein the internal thread surface is an M-head thread, the external thread is an N-head thread, the value of M is 2 to 4, the value of N is 1 to 3, and M=N+1.

10. The all-metal conical combined screw pump suitable for petroleum field, as recited in claim 1, the all-metal conical combined screw pump further comprises an auger, the auger comprises a central shaft and a spiral blade surrounding and fixed outside the central shaft, the auger is arranged between the rotor and the sucker rod and between two adjacent sucker rods, the two ends of the central shaft are respectively detachably fixedly connected with the corresponding rotor and the corresponding sucker rod.

11. The all-metal conical combined screw pump suitable for petroleum field, as recited in claim 1, the stator is integral or formed by fixedly connecting two or more stator units in the axial direction.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0018] FIG. 1 is a schematic diagram of the structure of the all-metal conical combined screw pump of the present invention.

[0019] FIG. 2 is a schematic diagram of the structure of the elastic telescopic component of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0020] As shown in FIG. 1 and FIG. 2, an all-metal conical combined screw pump suitable for petroleum field comprises: a stator, a rotor 2, a sleeve 3 and a sucker rod 4; wherein the stator is formed by at least two stator units which are fixedly connected along an axial direction. The stator is provided with an internal threaded curved surface, the rotor 2 is installed in the stator and is provided with an external threaded curved surface matching the internal threaded curved surface, the internal threaded curved surface is a double-threaded thread, and the external thread is a single-threaded thread. In other embodiments, The M of the internal thread surface can also be 3 or 4, and the N of the external thread surface can also be 2 or 3, M=N+1, the stator is fixedly connected to the sleeve 3, and the sucker rod 4 is installed in the sleeve 3, the sucker rod as a whole is formed by a detachable and fixed connection of a number of sucker rods. The internal threaded surface and the external threaded surface are both tapered spiral structures and have the same taper. Ends with a larger radial dimension of the internal thread surface and the external thread surface of the rotor are close to the sucker rod 4. FIGS. 1 and 2 are in the side-placed state. The all-metal conical combined screw pump is in an upright state when in use, that is, the radial dimension of the upper end of the inner threaded surface and the outer threaded surface is larger compared with the radial dimension of the lower end. The all-metal conical combined screw pump also includes elastic telescopic assembly, The elastic telescopic assembly includes a movable part, a fixed part and an elastic part. The movable part is fixedly connected to the rotor, and the fixed part is fixedly connected to the sucker rod. The movable part and the fixed part are slidingly fitted in the upper and lower directions and can transmit torque to the sucker rod and the rotor. One end of the elastic piece abuts against the movable piece and the other end against the fixed piece. The elastic piece can elastically contract or expand along the sliding direction of the movable piece; specifically, the movable part is the connecting shaft 6 and the fixed part is the connecting seat 12, The elastic telescopic assembly further includes a spring 15 and a limiting component, and the connecting shaft 6 includes a second threaded connector 7, a second outer flange 8, a main body 9, an engaging portion 10, and a first outer flange 11 that are sequentially connected in the axial direction. The connecting seat is provided with a cavity 13 and a limiting plate 14 installed at the opening of the cavity 13 and extending inward in the diameter direction. The engaging portion 10 of the connecting shaft passes through the limiting plate, and the first outer flange 11 is inserted In the cavity 13 of the connecting seat 12, the connecting shaft 6 can move along the axial direction of the connecting seat 12. The end of the connecting shaft 6 adjacent to the first outer flange, that is, the engaging portion 10 is provided with external teeth, The limiting plate 14 is provided with internal teeth, and the external teeth mesh with the internal teeth, that is, in the form of splines, the connecting shaft can transmit torque by cooperating with the connecting seat 12. The spring 15 is sleeved outside the connecting shaft 6, and one end of the spring 15 abuts the connecting seat 12 and the other end abuts the second outer flange 8 of the connecting shaft to realize the functions of elastic expansion and contraction. The limiting component includes a first outer flange 11 and a limiting plate 14. The first outer flange 11 is connected to the connecting shaft 6 which is adjacent to the end of the connecting seat 12 and protruding outward in the diameter direction. The limiting plate 14 is connected to the end of the connecting seat 12 adjacent to the connecting shaft 6 and protruding inward in the diameter direction, passing through the position-limiting cooperation between the first outer flange 11 and the limiting plate 14 prevents the connecting shaft 6 from being separated from the connecting seat 12.

[0021] The end of the rotor adjacent to the connecting shaft 6 is connected with a first threaded joint 5, and the end of the connecting shaft 6 adjacent to the rotor is connected with a second threaded joint 7. The first threaded joint 5 connects with the second threaded joint 7 pass through a threaded sleeve 16; The connecting seat 12 is integrally formed at the lower end of the sucker rod or fixedly installed at the lower end of the sucker rod, wherein the fixed installation can be detachable by using a threaded structure.

[0022] Between the inner core portion 10 and the main body 9 of the connecting shaft is provided with a step 19 that is in position with the limit plate 14 to prevent the spring 15 from being compressed during assembly, protect the spring 15 and ensure the effective function of the spring 15.

[0023] The all-metal conical composite screw pump also includes an auger, which includes a central shaft 17 and a spiral blade 18 surrounding and fixed outside the central shaft 17. The auger is arranged between the rotor 2 and the sucker rod 4 and between two adjacent sucker rods 4, both ends of the central shaft 6 are detachably fixedly connected with the corresponding rotor 2 and the corresponding sucker rod 4 through a threaded structure and a lock nut 7; the diameter of the central shaft 17 is larger than that diameter of the sucker rod 4 to improve the connection strength of the auger.