A limit device for preventing jamming of an all-metal conical screw pump, an intelligent system and an anti-wear control method of the intelligent system

Abstract

The present invention provides an anti-stuck limit device, an intelligent system and an anti-wear control method of the intelligent system for an all-metal conical screw pump, which can effectively prevent the rotor from getting stuck with the stator after it falls. An anti-stuck limit device for an all-metal conical screw pump, the all-metal screw pump includes a stator and a rotor, characterized in that: a sleeve is connected to the lower end of the stator, a support member is connected to the inner thread of the sleeve, a linkage member extending upward is installed on the top of the support member, and a notch is provided at the bottom of the rotor, or a notch is provided at the top of the support member, and a linkage member extending downward is installed at the bottom of the rotor. When the rotor falls until the linkage member extends into the notch, during the rotation of the rotor, the linkage member cooperates with the notch to drive the support member to rotate and move downward along the thread that cooperates with the sleeve, so that the interval between the support member and the rotor can be maintained within a preset interval, preventing the rotor from abutting against the support member during normal descent, and ensuring the normal operation of the rotor.

Description

Technical Field

[0001] The present invention relates to the technical field of oil production equipment, in particular to auxiliary equipment of an all-metal conical screw pump, and specifically to an anti-stuck limit device, an intelligent system and an anti-wear control method of the intelligent system for the all-metal conical screw pump. Background Art

[0002] If the caliper used to lock the sucker rod of the all-metal screw pump fails, the nut connecting the sucker rod and the rotor slips, or the sucker rod breaks, the rotor will fall and get stuck with the stator. Once stuck, the pump body will be scrapped. Summary of the invention

[0003] In view of the above problems, the present invention provides an anti-stuck limit device, an intelligent system and an anti-wear control method of the intelligent system for an all-metal conical screw pump, which can effectively prevent the rotor from getting stuck with the stator after falling.

[0004] The technical solution is as follows: a limit device for preventing a full metal conical screw pump from getting stuck, the full metal screw pump comprises a stator and a rotor, and is characterized in that: a sleeve is connected to the lower end of the stator, and a support is connected to the inner thread of the sleeve,

[0005] The top of the support member is provided with a linkage member extending upward, and the bottom of the rotor is provided with a notch, or the top of the support member is provided with a notch, and the bottom of the rotor is provided with a linkage member extending downward,

[0006] When the rotor descends until the linkage member extends into the notch, during the rotation of the rotor, the linkage member cooperates with the notch to drive the support member to rotate and move downward along the thread that cooperates with the sleeve.

[0007] Furthermore, the limiting device also includes an oil supply channel for connecting the oil well at the bottom of the support member and the internal cavity of the stator.

[0008] Furthermore, the oil supply channel is arranged inside the support member, and the oil supply channel passes through the support member from top to bottom; or, the oil supply channel is arranged outside the support member, and the lower end of the oil supply channel is connected to the lower oil well of the support member, and the upper end passes through the stator side wall and extends into the internal cavity of the stator.

[0009] Furthermore, the linkage member is eccentrically arranged relative to the support piece.

[0010] Furthermore, the linkage member is rotatably matched with the top of the support member or the bottom of the rotor through a bearing.

[0011] Furthermore, the linkage member is elastically connected to the top of the support member or the bottom of the rotor via a spring, and under the action of the spring, the linkage member can elastically expand and contract in the vertical direction.

[0012] Furthermore, the sleeve and the stator are formed in one piece or connected in a split manner.

[0013] Furthermore, a spring steel plate is installed at the lower end of the support member, and the spring steel plate elastically abuts against the inner wall or internal thread of the sleeve.

[0014] The limit device of the present invention provides a support member fixed to the stator under the rotor. When the rotor falls due to failure of the caliper used to lock the sucker rod, stripping of the nut connecting the sucker rod and the rotor, or breakage of the sucker rod, the rotor is supported on the support member to avoid the rotor and the stator from being stuck, thereby preventing the pump body from being scrapped. Moreover, when the caliper for locking the sucker rod fails, since the rotor and the stator are not stuck, there is no need to disassemble the pump body as a whole, which is simple to operate and inexpensive. In addition, when the rotor of the all-metal conical screw pump works normally, wear will occur and the pump efficiency will be reduced. It is necessary to move the rotor downward and adjust the gap between the rotor and the stator to maintain the pump efficiency. When the rotor falls until the linkage member extends into the notch, during the rotation of the rotor, the linkage member cooperates with the notch to drive the support member to rotate and move downward along the thread that cooperates with the sleeve, so that the support member and the rotor are always arranged at a distance, thereby preventing the rotor from abutting against the support member during the normal descent process in order to maintain the pump efficiency, thereby ensuring the normal operation of the rotor.

[0015] The present invention also provides an intelligent anti-jamming system for an all-metal conical screw pump, characterized in that the intelligent system comprises a lifting device and the above-mentioned limiting device, and the lifting device is used to lift or lower the sucker rod.

[0016] Further, the rotor of the all-metal conical screw pump is connected to a rotation drive device, the rotation drive device includes a direct-drive synchronous motor, a female transmission sleeve and a male transmission sleeve, the female transmission sleeve is coaxially fixed with the sleeve portion of the rotor of the direct-drive synchronous motor, the male transmission sleeve is inserted into the female transmission sleeve, the male transmission sleeve is in transmission cooperation with the female transmission sleeve and can slide up and down relative to the female transmission sleeve, the lifting device includes a rotor lifting drive device, a clamping device and a rotation connection component, the rotor lifting drive device includes a lifting drive unit and a lifting sleeve, the lifting sleeve and the male transmission sleeve are arranged from the inside to the outside on the sucker rod of the all-metal conical screw pump, the lifting sleeve drives the rotation connection component to be lifted synchronously when the lifting sleeve moves upward under the drive of the lifting drive unit, and drives the rotation connection component to be lowered synchronously when the lifting sleeve moves downward under the drive of the lifting drive unit;

[0017] The clamping device comprises a first clamping jaw, and the first clamping jaw is capable of clamping and fixing the sucker rod of the all-metal conical screw pump;

[0018] The rotating connection assembly includes a connecting piece and a first bearing. The upper end of the male transmission sleeve extends upward and is fixedly connected to the connecting piece after the direct-drive synchronous motor is driven. The upper end of the lifting sleeve passes through the male transmission sleeve and is rotatably matched with the connecting piece through the first bearing. The connecting piece is provided with a through hole. The sucker rod of the all-metal conical screw pump passes through the through hole and the center hole of the first bearing and is detachably connected to the first clamp. The first clamp is supported on the top of the connecting piece and is transmission-matched with the connecting piece.

[0019] Furthermore, the lifting drive unit is a hydraulic cylinder or a servo electric cylinder, the output shaft of the hydraulic cylinder or the servo electric cylinder is a sleeve structure with openings at both ends, the output shaft sleeve is arranged outside the sucker rod and the lower end of the transmission sleeve is supported on the upper end of the output shaft.

[0020] The intelligent system of the present invention will cause wear and reduce the pump efficiency when the rotor of the all-metal conical screw pump works normally after the stator is worn. At this time, the rotor is moved downward by lifting the drive unit. If the actual pump efficiency reaches the working pump efficiency, the upper end surface of the linkage part and the lower end surface of the rotor will abut against each other, and friction will occur between the two, affecting the normal operation of the rotor and the service life of the linkage part. The lifting drive unit can move the rotor further downward so that the linkage part extends into the gap. During the rotation of the rotor, the side wall of the gap abuts against the linkage part, driving the support part to rotate and move downward along the thread that cooperates with the sleeve, and then lift the rotor to restore the working pump efficiency, so that the linkage part is always disengaged from the rotor, avoiding the abutment between the rotor and the linkage part, and ensuring the normal operation of the rotor.

[0021] An anti-wear control method for an anti-stuck intelligent system of an all-metal conical screw pump, characterized in that:

[0022] The anti-wear control method is implemented periodically during the operation of the all-metal conical screw pump. Before the anti-wear control method is implemented, the actual pump efficiency of the all-metal conical screw pump can be within a preset working pump efficiency range under the regulation of the lifting drive unit;

[0023] The anti-wear control method comprises the following steps performed in sequence:

[0024] S1, descending, the lifting drive unit drives the rotor to descend, and when the rotor speed remains unchanged, after the rotor descends, the actual pump efficiency exceeds the upper limit of the preset working pump efficiency;

[0025] S2. Lifting: the lifting drive unit drives the rotor to lift. When the rotor speed remains unchanged, after the rotor is lifted, the actual pump efficiency is within a preset working pump efficiency range.

[0026] When the lifting unit adjusts the rotor height so that the actual pump efficiency can be within the preset working pump efficiency range under the adjustment of the lifting drive unit, if the upper end surface of the linkage part abuts against the lower end surface of the rotor, and at the same time, the linkage part is not enough to extend into the gap under the action of the spring, friction will occur between the linkage part and the rotor, affecting the normal operation of the rotor and the service life of the linkage part. If the upper end surface of the linkage part abuts against the lower end surface of the rotor, through the implementation of the anti-wear control method of the present invention, after the rotor moves down, the linkage part can extend into the gap under the action of the spring, and the rotor rotates, driving the linkage part and the support part to rotate and move down. After the rotor moves up, the linkage part can be separated from the rotor. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic structural diagram of the limiting device of the present invention.

[0028] Figure 2 for Figure 1 A schematic diagram of a partially enlarged portion of the stator, connecting sleeve, sleeve and support assembly.

[0029] Figure 3 It is a schematic structural diagram of the lifting device of the present invention. DETAILED DESCRIPTION

[0030] like Figure 1~Figure 3 As shown, a stopper device for preventing a full metal conical screw pump from getting stuck is provided. The full metal screw pump comprises a stator 2 and a rotor 1. A connecting sleeve 4 is welded to the lower end of the stator 2. A sleeve 5 is internally threadedly connected to the connecting sleeve. A support member 6 is internally threadedly connected to the sleeve 5. The sleeve 5, the connecting sleeve and the stator 2 can be integrally formed or connected in a split manner.

[0031] The support member 6 is provided with an oil supply channel 7 which runs from top to bottom, and the oil supply channel 7 connects the oil well at the bottom of the support member 6 and the internal cavity of the stator 2. A linkage member 8 extending upward is installed on the top of the support member 6. A notch 9 is provided at the bottom of the rotor 1. The linkage member 8 is eccentrically arranged relative to the support member 6 so that the rotor can better drive the linkage member to rotate.

[0032] When the rotor 1 descends until the linkage member 8 extends into the notch 9 , during the rotation of the rotor 1 , the linkage member 8 cooperates with the notch 9 to drive the support member 6 to rotate and move downward along the thread that cooperates with the sleeve 5 .

[0033] The linkage member 8 is rotatably matched with the top of the support member 6 through the bearing to prevent the linkage member from getting stuck; the linkage member 8 is elastically connected to the top of the support member 6 or the bottom of the rotor 1 through the spring. Under the action of the spring, when the rotor moves downward and is restricted by the linkage member 8 and moves further downward, the linkage member 8 can elastically expand and contract vertically to avoid restriction of the rotor by the linkage member 8 and prevent the rotor from crushing the linkage member 8. When the rotor rotates until the notch is opposite to the linkage member 8, the linkage member 8 extends into the notch under the action of the spring and abuts against the side wall of the notch.

[0034] A spring steel plate 18 is installed at the lower end of the support member 6, and the spring steel plate 18 elastically abuts against the inner wall or internal thread of the sleeve 5. The spring steel plate 18 can play an anti-loosening role and can prevent the support member from loosening and falling off due to vibration when the all-metal conical screw pump is in operation.

[0035] The support is pre-installed at the bottom of the stator. During the installation of the rotor, the support is adjusted to the precise position by rotating the rotor.

[0036] An intelligent system for preventing a full-metal conical screw pump from getting stuck, the intelligent system includes a lifting device and the above-mentioned limit device, the lifting device is used to lift or lower the sucker rod. Specifically, the rotor 1 of the full-metal conical screw pump is connected to a rotation drive device, the rotation drive device includes a direct-drive synchronous motor 10, a female transmission sleeve 11 and a male transmission sleeve 12, the female transmission sleeve 11 is coaxially fixed with the sleeve portion of the rotor 1 of the direct-drive synchronous motor 10, the male transmission sleeve 12 is inserted into the female transmission sleeve 11, the male transmission sleeve 12 is in transmission cooperation with the female transmission sleeve 11 and can slide up and down relative to the female transmission sleeve 11, the lifting device includes a rotor lifting drive device, a clamping device and a rotation connection assembly 13, the rotor lifting drive device includes a lifting drive unit 19 and a lifting sleeve 17, the lifting sleeve 17 and the male transmission sleeve 12 are arranged from the inside to the outside on the sucker rod 3 of the full-metal conical screw pump;

[0037] The clamping device includes a first clamping jaw 16a and a second clamping jaw 16b. Both the first clamping jaw 16a and the second clamping jaw 16b can clamp and fix the sucker rod 3 of the all-metal conical screw pump. The second clamping jaw is fixedly connected to the wellhead device or the sucker outer casing sleeved outside the sucker rod 3. The second clamping jaw 16b can clamp and fix the sucker rod when the first clamping jaw 16a is loosened.

[0038] The rotating connection assembly 13 includes a first connecting member 13a, a second connecting member 13b, a first bearing 14 and a second bearing 15. The upper end of the male transmission sleeve 12 extends upward and is fixedly connected to the second connecting member 13b after the direct-drive synchronous motor 10 is driven. The first connecting member 13a is fixed on the second connecting member 13b. After the upper end of the lifting sleeve 17 passes through the male transmission sleeve 12, the top of the lifting sleeve 17 is rotatably matched with the first connecting member 13a through the first bearing 14, and the side is rotatably matched with the second connecting member 13b through the second bearing 15. The first connecting member 13a and the second connecting member 13b are penetrated from top to bottom through the through hole. The sucker rod 3 of the all-metal conical screw pump passes through the through hole and the center hole of the first bearing and is detachably connected to the first clamp. The first clamp is supported on the top of the connecting member and is transmission-matched with the connecting member.

[0039] The lifting drive unit 19 is a hydraulic cylinder, and the output shaft of the hydraulic cylinder is a sleeve structure with openings at both ends. The output shaft sleeve is arranged outside the sucker rod 3 and the lower end of the transmission sleeve is supported on the upper end of the output shaft. Compared with the motor and gearbox transmission, the hydraulic cylinder has a small size, low noise and high load-bearing capacity.

[0040] When the lifting sleeve 17 is lifted upwards driven by the hydraulic cylinder, it drives the rotating connection component 13, the first clamping claw 16a connected thereto, and the sucker rod to be lifted synchronously. When the lifting sleeve 17 is driven downwards driven by the hydraulic cylinder, it drives the rotating connection component 13, the first clamping claw 16a connected thereto, and the sucker rod to be lowered synchronously. The setting of the first bearing 14 and the second bearing 15 can prevent the lifting sleeve from rotating when the direct-drive synchronous motor is working.

[0041] An anti-wear control method for an anti-seizure intelligent system of an all-metal conical screw pump, wherein the anti-wear control method is implemented periodically during the operation of the all-metal conical screw pump, and before the anti-wear control method is implemented, the actual pump efficiency of the all-metal conical screw pump can be within a preset working pump efficiency range under the regulation of a lifting drive unit;

[0042] The anti-wear control method comprises the following steps performed in sequence:

[0043] S1, descending, the lifting drive unit drives the rotor to descend. When the rotor speed remains unchanged, after the rotor descends, the actual pump efficiency exceeds the preset upper limit of the working pump efficiency;

[0044] S2, lifting. The lifting drive unit drives the rotor to lift. When the rotor speed remains unchanged, after the rotor is lifted, the actual pump efficiency is within the preset working pump efficiency range.

[0045] When the lifting unit adjusts the rotor height so that the actual pump efficiency can be within the preset working pump efficiency range under the adjustment of the lifting drive unit, if the upper end surface of the linkage part abuts against the lower end surface of the rotor, and at the same time, the linkage part is not enough to extend into the gap under the action of the spring, friction will occur between the linkage part and the rotor, affecting the normal operation of the rotor and the service life of the linkage part. If the upper end surface of the linkage part abuts against the lower end surface of the rotor, through the implementation of the anti-wear control method of the present invention, after the rotor moves down, the linkage part can extend into the gap under the action of the spring, and the rotor rotates, driving the linkage part and the support part to rotate and move down. After the rotor moves up, the linkage part can be separated from the rotor.

[0046] The cycle can be half a month; the descent height can be a fixed value, such as 3mm, or the speed can be adjusted while maintaining the pump efficiency. For example, when the actual pump efficiency is within the preset working pump efficiency range, the rotor speed is 120rpm / min, the rotor descends, and the gap between the rotor and the stator decreases. By reducing the rotor speed, the pump efficiency is maintained. When the rotor speed is reduced to 80rpm / min, it can be sufficient.

Claims

1. A stopper device for preventing a stuck state of an all-metal conical screw pump, the all-metal screw pump comprising a stator and a rotor, characterized in that: A sleeve is connected to the lower end of the stator, a support member is connected to the inner thread of the sleeve, a linkage member extending upward is installed on the top of the support member, a notch is provided at the bottom of the rotor, or a notch is provided at the top of the support member, a linkage member extending downward is installed at the bottom of the rotor, when the rotor descends until the linkage member extends into the notch, during the rotation of the rotor, the linkage member cooperates with the notch to drive the support member to rotate and move downward along the thread that cooperates with the sleeve; the limiting device also includes an oil supply channel for connecting the lower oil well of the support member and the internal cavity of the stator; the linkage member is eccentrically arranged relative to the support member.

2. The anti-stuck limit device of the all-metal conical screw pump according to claim 1, characterized in that: The oil supply channel is arranged inside the support member, and the oil supply channel passes through the support member from top to bottom; or, the oil supply channel is arranged outside the support member, the lower end of the oil supply channel is connected to the lower oil well of the support member, and the upper end passes through the stator side wall and then extends into the internal cavity of the stator.

3. The anti-stuck limit device of the all-metal conical screw pump according to claim 1, characterized in that: The linkage member is rotationally matched with the top of the support member or the bottom of the rotor through a bearing.

4. The anti-stuck limit device of the all-metal conical screw pump according to claim 1, characterized in that: The linkage member is elastically connected to the top of the support member or the bottom of the rotor through a spring. Under the action of the spring, the linkage member can elastically expand and contract in the vertical direction.

5. The anti-stuck limit device of the all-metal conical screw pump according to claim 1, characterized in that: The sleeve and the stator are integrally formed or connected in a split manner.

6. The anti-stuck limit device of the all-metal conical screw pump according to claim 1, characterized in that: A spring steel plate is installed at the lower end of the support member, and the spring steel plate elastically abuts against the inner wall or the internal thread of the sleeve.

7. An intelligent anti-stuck system for an all-metal conical screw pump, characterized in that: The intelligent system comprises a lifting device and a limiting device as described in any one of claims 1 to 6, wherein the lifting device is used to lift or lower the sucker rod.

8. The intelligent anti-stuck system of an all-metal conical screw pump according to claim 7, characterized in that: The rotor of the all-metal conical screw pump is connected to a rotation drive device, the rotation drive device includes a direct-drive synchronous motor, a female transmission sleeve and a male transmission sleeve, the female transmission sleeve is coaxially fixed with the sleeve portion of the rotor of the direct-drive synchronous motor, the male transmission sleeve is inserted into the female transmission sleeve, the male transmission sleeve is in transmission cooperation with the female transmission sleeve and can slide up and down relative to the female transmission sleeve, the lifting device includes a rotor lifting drive device, a clamping device and a rotation connection component, the rotor lifting drive device includes a lifting drive unit and a lifting sleeve, the lifting sleeve and the male transmission sleeve are arranged from the inside to the outside on the sucker rod of the all-metal conical screw pump, the lifting sleeve drives the rotation connection component to be lifted synchronously when it moves upward under the drive of the lifting drive unit, and drives the rotation connection component to be lowered synchronously when the lifting sleeve moves downward under the drive of the lifting drive unit; The clamping device comprises a first clamping jaw, and the first clamping jaw is capable of clamping and fixing the sucker rod of the all-metal conical screw pump; The rotating connection assembly includes a connecting piece and a first bearing. The upper end of the male transmission sleeve extends upward and is fixedly connected to the connecting piece after the direct-drive synchronous motor is driven. The upper end of the lifting sleeve passes through the male transmission sleeve and is rotatably matched with the connecting piece through the first bearing. The connecting piece is provided with a through hole. The sucker rod of the all-metal conical screw pump passes through the through hole and the center hole of the first bearing and is detachably connected to the first clamp. The first clamp is supported on the top of the connecting piece and is transmission-matched with the connecting piece.

9. The intelligent anti-stuck system of an all-metal conical screw pump according to claim 8, characterized in that: The lifting drive unit is a hydraulic cylinder or a servo electric cylinder. The output shaft of the hydraulic cylinder or the servo electric cylinder is a sleeve structure with openings at both ends. The output shaft is sleeved outside the sucker rod and the lower end of the transmission sleeve is supported on the upper end of the output shaft.

10. The anti-wear control method of the anti-stuck intelligent system of the all-metal conical screw pump according to any one of claims 7 to 9, characterized in that: The anti-wear control method is implemented periodically during the operation of the all-metal conical screw pump. Before the anti-wear control method is implemented, the actual pump efficiency of the all-metal conical screw pump can be within a preset working pump efficiency range under the regulation of the lifting drive unit; The anti-wear control method comprises the following steps performed in sequence: S1, descending, the lifting drive unit drives the rotor to descend, and when the rotor speed remains unchanged, after the rotor descends, the actual pump efficiency exceeds the upper limit of the preset working pump efficiency; S2. Lifting: the lifting drive unit drives the rotor to lift. When the rotor speed remains unchanged, after the rotor is lifted, the actual pump efficiency is within a preset working pump efficiency range.

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