Straight cylinder type oil pumping unit

Abstract

The utility model discloses a straight tube type oil pumping unit which comprises an oil well pump and further comprises an electric cylinder unit arranged over the oil well pump, the electric cylinder unit comprises a cylinder barrel, a nut, a lead screw and a servo motor, a guide channel is formed in the middle of the cylinder barrel, the nut is arranged on the lead screw in a penetrating mode and fixed to the bottom of the guide channel, and the servo motor is arranged on the guide channel. The servo motor is installed on the sliding frame, the sliding frame can move up and down along the inner wall of the guide channel, the upper end of the lead screw is connected with a rotating shaft of the servo motor, and the lower end of the lead screw is movably connected with a plunger rod of the oil well pump. The plunger rod of the oil well pump is plugged in the electric cylinder unit, the plunger rod moves up and down through vertical movement of the lead screw, the plunger rod does not need to be pulled outside through a rigging any more, the plunger rod is not exposed outside any more, and work risks are reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of pumping unit, especially relates to a straight cylinder type pumping unit. BACKGROUND

[0002] In the field of oil exploitation, pumping units can be divided into beam type and beamless type according to their mechanical structures. Among them, the beamless pumping unit mainly includes the following two technical routes:

[0003] Chain pumping unit: through the slider-crank mechanism, the rotary motion is converted into reciprocating linear motion to drive the downhole pump column to work;

[0004] Steel rope pumping unit: the lifting movement of the sucker rod is realized by the forward and reverse rotation of the drum.

[0005] Defects of prior art: both types of beamless pumping units have the risk of exposed rigging - chain or steel rope as the core transmission component is directly exposed to the external environment. Under the condition of continuous high load operation, the rigging may be broken due to fatigue, corrosion or accidental impact, causing major safety accidents such as equipment damage and personnel injury. INVENTION CONTENTS

[0006] The utility model wants to solve the technical problem in prior art, provide a straight cylinder type pumping unit, the plunger rod of pumping unit is blocked in the electric cylinder unit, the up-down movement of the lead screw is used to realize the up-down operation of the plunger rod, the plunger rod is no longer pulled by the external rigging and no longer exposed, and the working risk is reduced.

[0007] To solve the above technical problems, the utility model adopts the technical scheme: a straight cylinder type pumping unit, comprising a pumping unit, further comprising an electric cylinder unit arranged directly above the pumping unit, the electric cylinder unit comprising a cylinder, a nut, a lead screw and a servo motor, a guide passage is formed in the middle of the cylinder, the nut is arranged on the lead screw, and the nut is fixed at the bottom of the guide passage, the servo motor is installed on the sliding frame, the sliding frame can move up and down along the inner wall of the guide passage, the upper end of the lead screw is connected with the rotating shaft of the servo motor, and the lower end of the lead screw is movably connected with the plunger rod of the pumping unit.

[0008] The straight cylinder type pumping unit, the lower end of the lead screw is provided with a mounting port, the upper end of the plunger rod is provided with a limiting block, the limiting block is located in the mounting port, two thrust bearings are installed at the opening of the mounting port, the limiting block is clamped between the two thrust bearings, and the plunger rod passes through the middle of the thrust bearing.

[0009] The slide frame is rectangular in structure, the guide channel is a rectangular channel in section, and the inner wall of the guide channel is provided with a slide rail.

[0010] The slide frame is provided with a heat dissipation hole.

[0011] The cylinder barrel is provided with a lower air guide channel on one side and an upper air guide channel on the other side, and the lower air guide channel and the upper air guide channel are both communicated with the guide channel.

[0012] The outer side interfaces of the lower air guide channel and the upper air guide channel are both provided with dustproof filter screens.

[0013] The upper part of the servo motor is provided with a light coupling baffle, the upper part of the cylinder barrel is provided with a sealing plate, the sealing plate is provided with a detection light coupling at the position inside the guide channel, and the light coupling baffle and the detection light coupling are used in cooperation.

[0014] The sealing plate is provided with a wire hole at the position inside the guide channel, and the wire hole is used for passing the power line of the servo motor.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] 1. The electric cylinder unit is directly located above the oil pumping pump to form a compact straight cylinder structure, the intermediate transmission components such as the crank connecting rod and the speed reducer of the traditional beam-type oil pumping machine are omitted, mechanical inertia energy loss is reduced, and transmission efficiency is improved.

[0017] 2. The servo motor directly drives the plunger rod through a screw-nut pair to realize the conversion of rotary motion into linear motion, avoid the problems of easy aging and slipping of belt transmission, and improve energy utilization rate.

[0018] 3. The servo motor is designed in cooperation with the guide channel of the slide frame to realize stepless adjustment of stroke and frequency, and meet the requirements of pumping in complex conditions such as thick oil wells and deep wells.

[0019] The technical scheme of the utility model will be further described in detail below with reference to the drawings and embodiments. DRAWINGS

[0020] Figure 1 It is a structural principle schematic view of the utility model.

[0021] Figure 2 It is a sectional view of the slide frame.

[0022] Figure 3 It is an enlarged view of A in Figure 1 ​

[0023] Figure 4 For Figure 1 enlarged view of B in FIG.

[0024] BRIEF DESCRIPTION OF DRAWINGS

[0025] 1 - cylinder; 2 - nut; 3 - screw rod;

[0026] 4 - servo motor; 5 - guide channel; 6 - sliding frame;

[0027] 7 - plunger rod; 8 - blocking seat; 9 - blocking channel;

[0028] 10 - sealing plug; 11 - limiting block; 12 - thrust bearing;

[0029] 13 - sliding rail; 14 - heat dissipation hole; 15 - lower air guide channel;

[0030] 16 - upper air guide channel; 17 - light coupling stopper; 18 - sealing plate;

[0031] 19 - detection light coupling; 20 - wire hole; 21 - power line. DETAILED DESCRIPTION

[0032] As Figure 1 shown in FIG. Figure 4 , a straight cylinder type pumping unit comprises a pumping unit, and further comprises an electric cylinder unit arranged directly above the pumping unit, the electric cylinder unit comprising a cylinder 1, a nut 2, a screw rod 3 and a servo motor 4, the cylinder 1 being provided with a guide channel 5 in the middle, the nut 2 being arranged on the screw rod 3, and the nut 2 being fixed at the bottom of the guide channel 5, the servo motor 4 being installed on a sliding frame 6, the sliding frame 6 being movable up and down along the inner wall of the guide channel 5, the upper end of the screw rod 3 being connected with the rotating shaft of the servo motor 4, and the lower end of the screw rod 3 being movably connected with the plunger rod 7 of the pumping unit.

[0033] In actual use, the servo motor 4 drives the screw rod 3 to rotate, because the nut 2 is fixed in the guide channel 5 by screws, when the screw rod 3 rotates, it moves up and down along the guide channel 5, thereby driving the plunger rod 7 of the pumping unit to move up and down, so as to realize oil pumping; during operation, the servo motor 4 drives the sliding frame 6 to move up and down along the inner wall of the guide channel 5.

[0034] A blocking seat 8 is arranged between the pumping unit and the electric cylinder unit, the blocking seat 8 being vertically provided with a blocking channel 9, the lower end of the screw rod 3 extending into the blocking channel 9 from top to bottom, the plunger rod 7 of the pumping unit extending into the blocking channel 9 from bottom to top and being connected with the lower end of the screw rod 3; a sealing plug 10 is detachably installed at the lower end of the blocking channel 9, and the sealing plug 10 has a through hole in the middle for the plunger rod 7 to pass through.

[0035] In this embodiment, the lower end of the lead screw 3 is provided with a mounting port, the upper end of the plunger rod 7 is provided with a limiting block 11, the limiting block 11 is located in the mounting port, two thrust bearings 12 are mounted at the opening of the mounting port, the limiting block 11 is clamped between the two thrust bearings 12, and the plunger rod 7 passes through the middle of the thrust bearing 12.

[0036] It should be noted that the limiting block 11 is a spherical structure. The arrangement of the two thrust bearings 12 can avoid the synchronous rotation of the plunger rod 7 when the lead screw 3 rotates, and avoid the torque applied to the plunger rod 7.

[0037] In this embodiment, the sliding frame 6 is a rectangular structure, the cross section of the guide channel 5 is an adaptive rectangular channel, the inner wall of the guide channel 5 is provided with a sliding rail 13, and the sliding frame 6 is provided with a sliding groove matched with the sliding rail 13.

[0038] It should be noted that the rectangular sliding frame 6 cooperates with the sliding rail 13 / slide groove of the guide channel 5, completely eliminates the problem of torque transmission imbalance caused by the rotation of the lead screw 3, and ensures the pure vertical movement of the lead screw 3.

[0039] In this embodiment, the sliding frame 6 is provided with a heat dissipation hole 14. The heat dissipation hole 14 is designed to actively discharge the heat of the servo motor 4, so as to avoid the demagnetization of the permanent magnet or the decrease of control accuracy caused by high temperature.

[0040] In this embodiment, one side of the cylinder barrel 1 is provided with a lower air guide channel 15, and the other side is provided with an upper air guide channel 16. The lower air guide channel 15 and the upper air guide channel 16 are both connected with the guide channel 5.

[0041] The lower air guide channel 15 and the upper air guide channel 16 form a chimney effect, utilize the principle of hot air rising to enhance convection heat dissipation, and solve the problem of heat accumulation in the closed space.

[0042] In this embodiment, dustproof filter screens are arranged at the outer interfaces of the lower air guide channel 15 and the upper air guide channel 16.

[0043] The dustproof filter screens block the oil field dust from entering the guide channel 5, protect the sliding frame 6, and reduce the wear and maintenance frequency.

[0044] In this embodiment, the upper part of the servo motor 4 is provided with an optical coupling baffle 17, the upper part of the cylinder barrel 1 is provided with a sealing plate 18, the sealing plate 18 is provided with a detection optical coupling 19 at the position inside the guide channel 5, and the optical coupling baffle 17 and the detection optical coupling 19 are matched for use.

[0045] The light coupling baffle 17 cooperates with the detection light coupling 19 to feed back the stroke distance in real time, facilitate the adjustment and control of the stroke, realize soft start and stop and overload protection, and avoid mechanical impact.

[0046] In the embodiment, the lead hole 20 is arranged on the position of the sealing plate 18 inside the guide channel 5, and the power line 21 of the servo motor 4 is arranged through the lead hole 20.

[0047] It should be noted that the lead hole 20 is specially arranged on the sealing plate 18, the wiring path of the power line 21 is standardized, the cable winding damage is prevented, and the on-site maintenance is facilitated.

[0048] In actual use, the part of the power line 21 inside the guide channel 5 is of a spring structure and can stretch and contract with the movement of the servo motor 4.

[0049] The above is only a preferred embodiment of the present application, and does not limit the present application in any way. Any simple modification, change and equivalent structural change made according to the technical essence of the present application to the above embodiment are still within the protection scope of the technical scheme of the present application.

Claims

1. A straight-line pumping unit comprising a pumping well, characterized in that, Also include the electric cylinder unit arranged directly above the oil pump, the electric cylinder unit includes cylinder, nut, screw and servo motor, the middle of the cylinder is provided with a guide channel, the nut is provided on the screw, and the nut is fixed at the bottom of the guide channel, the servo motor is installed on the sliding frame, the sliding frame can move up and down along the inner wall of the guide channel, the upper end of the screw is connected with the rotating shaft of the servo motor, and the lower end of the screw is movably connected with the plunger rod of the oil pump.

2. A straight line type pumping unit according to claim 1, wherein The lower end of the screw is provided with a mounting port, the upper end of the plunger rod is provided with a limiting block, the limiting block is located in the mounting port, two thrust bearings are installed at the opening of the mounting port, the limiting block is clamped between the two thrust bearings, and the plunger rod passes through the middle of the thrust bearing.

3. A straight line type pumping unit as defined in claim 1 wherein, The sliding frame is of rectangular structure, the cross section of the guide channel is an adaptive rectangular channel, the inner wall of the guide channel is provided with a sliding rail, and the sliding frame is provided with a sliding groove matched with the sliding rail.

4. A straight line type pumping unit as defined in claim 3 wherein, The sliding frame is provided with a heat dissipation hole.

5. A straight line type pumping unit as defined in claim 3 wherein, One side of the cylinder is provided with a lower air guide channel, and the other side is provided with an upper air guide channel, and the lower air guide channel and the upper air guide channel are communicated with the guide channel.

6. A straight line type pumping unit as defined in claim 5 wherein, The outer side of the lower air guide channel and the upper air guide channel is provided with a dustproof filter screen.

7. A straight line type pumping unit as defined in claim 1 wherein, The upper part of the servo motor is provided with a photocoupler baffle, the upper part of the cylinder is provided with a sealing plate, the sealing plate is provided with a detection photocoupler at the position inside the guide channel, and the photocoupler baffle and the detection photocoupler are matched for use.

8. A straight line type pumping unit as defined in claim 7 wherein, The sealing plate is provided with a wire hole at the position inside the guide channel, and the wire hole is provided for the power line of the servo motor.

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