CN115182696B

CN115182696B - Polished rod sealing device with clearance function

Info

Publication number: CN115182696B
Application number: CN202211092151.5A
Authority: CN
Inventors: 党若飞; 上官德安; 彭虹; 白靓; 马俊杰; 于涛; 韩雷; 张凯; 王营; 李向向; 李文文; 朱翠香
Original assignee: Shengli Oilfield Dongqiang Mechanical And Electrical Equipment Manufacturing Co ltd
Current assignee: Shengli Oilfield Dongqiang Mechanical And Electrical Equipment Manufacturing Co ltd
Priority date: 2022-09-08
Filing date: 2022-09-08
Publication date: 2022-11-22
Anticipated expiration: 2042-09-08
Also published as: CN115182696A

Abstract

The invention provides a polished rod sealing device with a cleaning function, which relates to the technical field of polished rod sealing devices and comprises a base, wherein a flange plate is arranged at the lower part of the base, the base is sequentially connected with a first connecting shell, a second connecting shell and a third connecting shell, the upper part of the third connecting shell is in threaded connection with a gland, a polished rod penetrates through the gland and is in sliding fit with the gland, the third connecting shell is provided with a first fixing block, a first pressing seat is arranged in the third connecting shell, the gland is provided with a first extrusion piece, a second pressing seat is arranged at the lower part of the first extrusion piece, a first packing is arranged between the first pressing seat and the second pressing seat, and the first disk is sleeved on the polished rod and is in sliding fit with the polished rod. According to the invention, the first pressing seat and the second pressing seat are matched with the first conical disk root, the first disk root is subjected to radial extrusion force, the source of the extrusion force is more direct, and the sealing effect of the first disk root on a polish rod is improved; utilize first extruded article to extrude the second downwards and press the seat, the interval of extension operating personnel inspection time improves the practicality of this device.

Description

Polished rod sealing device with clearance function

Technical Field

The invention relates to the technical field of polished rod sealing devices, in particular to a polished rod sealing device with a cleaning function.

Background

China mostly utilizes the pumping unit in the process of oil field exploitation, the pumping unit drives the pumping rod to reciprocate up and down to pump underground petroleum through the polished rod, and in order to prevent the petroleum from overflowing to the ground along the polished rod, the polished rod sealer is usually matched with the polished rod, so that the polished rod sealer can not only reduce the waste of the petroleum, but also avoid the pollution to the surrounding environment caused by the leakage of the petroleum from a well head.

The existing polish rod sealer seals a polish rod through a packing, but the polish rod moves up and down in a reciprocating manner to cause the abrasion of the packing, so that an oilfield worker needs to regularly patrol the polish rod, and the labor intensity of the oilfield worker is increased because the packing is abraded quickly and the patrol time interval of the oilfield worker is very short; oil field workers make the packing take place deformation through the gland of screwing downwards when patrolling and examining, and the packing takes place deformation just attached to the polished rod, because the packing has received wearing and tearing, the gland of screwing downwards can only extrude the packing in vertical direction, and the packing takes place deformation, but the packing receives radial effort minimum, leaves the clearance with the contact department of polished rod after leading to the packing deformation and leads to the contact incomplete, leads to the packing to be unsatisfactory to the sealed effect of polished rod.

Disclosure of Invention

The invention aims to solve the problems in the prior art and provides a polished rod sealing device with a cleaning function.

The technical scheme provided by the invention is as follows: the utility model provides a polished rod sealing device with clearance function, the on-line screen storage device comprises a base, the lower part of base is provided with the ring flange, the base has connected gradually first connecting shell, second connecting shell and third connecting shell, the base, first connecting shell, second connecting shell and third connecting shell connect and form the support housing, the upper portion threaded connection of third connecting shell has the gland, the polished rod passes gland and sliding fit, the third connecting shell is provided with first fixed block, the polished rod passes first fixed block and sliding fit, be provided with first pressure seat in the third connecting shell, first pressure seat and third connecting shell sealing contact, the gland is provided with first extruded article, the lower part of first extruded article is provided with the second and presses the seat, be provided with first packing between first pressure seat and the second pressure seat, first packing cover is located on the polished rod and sliding fit, first extruded article utilizes second pressure seat and first pressure seat to extrude first packing, the first packing receives radial effort to polish rod sealing, be provided with the extrusion mechanism that the polished rod is used for extrudeing first packing between base and the third connecting shell, pressure transmission to the well pumping well sealing mechanism, be provided with the supplementary sealing mechanism that spouts sealing shell.

Furthermore, the first pressure seat and the second pressure seat are circumferentially provided with openings, the openings of the first pressure seat and the second pressure seat are staggered, the inner annular surfaces of the first pressure seat and the second pressure seat are respectively matched with the outer annular surface of the first packing, and the first packing is a conical surface with the diameter gradually reduced from the middle part to two sides.

Further, the pressure extrusion mechanism includes the second fixed block, second fixed block rigid coupling is in the base, the second fixed block is provided with the first fixed pipe of a plurality of, it is provided with the piston all to slide in every first fixed pipe, every first fixed pipe all communicates there is the connecting pipe, the check valve is all installed on the upper portion of every connecting pipe, the upper portion of every first fixed pipe all communicates there is the back flow, the check valve of every connecting pipe all is located between the both ends mouth of adjacent back flow, all install the ball valve on every back flow, first fixed block is provided with the fixed pipe of a plurality of second, every fixed pipe of second communicates with adjacent connecting pipe respectively, it is provided with the slide bar all to slide in every fixed pipe of second, every slide bar is sealed with the fixed pipe of adjacent second respectively and cooperates, a plurality of slide bars all with first pressure seat rigid coupling, the first fixed pipe of a plurality of forms the cavity with adjacent connecting pipe and the fixed pipe intercommunication of second respectively, and the cavity intussuseption is filled with hydraulic oil.

Further, sealed blowout prevention mechanism includes the third fixed block, the third fixed block sets up in the second connects the shell, the middle part of third fixed block is provided with circular cavity, third fixed block lower part cavity diameter is greater than upper portion cavity diameter, the lower part is provided with the second extruded article in the third fixed block cavity, lower part sliding connection has the backup pad in the third fixed block cavity, backup pad and the sealed cooperation of third fixed block cavity lower part, second extruded article and backup pad rigid coupling, upper portion is provided with the second packing that is used for sealing to the polished rod in the third fixed block cavity, the second packing is around locating on the polished rod and rather than sliding fit, the downside of third fixed block is provided with solid fixed ring, it is provided with the closing plate to slide in the first connection shell, the polished rod passes the closing plate and rather than sliding fit, the closing plate extrudees sealedly with solid fixed ring.

Further, solid fixed ring sets up to hard material, gu be provided with the thin conical groove in thick higher authority below on the fixed ring, is provided with annular sealing ring in solid fixed ring's the conical groove, and the upper portion of closing plate is provided with the conical surface arch, and the interior anchor ring of closing plate is provided with the sealing ring of soft material, and the slope conical surface arch of closing plate is sealed with solid fixed ring's conical groove cooperation, prevents that the too big blowout of taking place of downhole pressure.

Further, manual sealing mechanism includes the set casing, the set casing sets up in first connecting shell, the middle part of set casing is provided with circular through-hole, the polished rod passes the circular through-hole and the sliding fit of set casing, the equal sliding connection in both parts has sealed slider around the set casing, the arc wall has all been seted up to two sealed slider's opposite side, the arc wall of two sealed slider is used for sealing the polished rod, two sealed slider respectively with the sealed slip of set casing medial surface, the equal symmetry in both sides is provided with four rectangular through-holes about the set casing, the anterior rotation of set casing is provided with the drive pivot, drive pivot and anterior sealed slider threaded connection, both sides all have the rack through the connecting block rigid coupling around two sealed slider, the connecting block of four racks is sliding connection respectively in four rectangular through-holes of set casing, the side rotates on the set casing and is provided with the gear, two gears respectively with two adjacent rack toothing.

Furthermore, the arc-shaped grooves of the two sealing sliding blocks are internally provided with high-temperature resistant soft sealing rings.

Further, still include polished rod clearance mechanism, polished rod clearance mechanism sets up on the gland, polished rod clearance mechanism is used for clearing up the rubbish of adhesion on the polished rod, polished rod clearance mechanism includes two fixing bases, two fixing base symmetry formula rigid couplings are on the gland, two fixing bases all rotate and are connected with the axis of rotation, the both ends difference rigid coupling of two axis of rotation has a plurality of magnet piece, two axes of rotation all rotate and are connected with the extrusion wheel, two extrusion wheels all are provided with a plurality of magnet piece, two extrusion wheels pass through the magnetic attraction cooperation with adjacent axis of rotation, two axis of rotation all are provided with two links, the equal rigid coupling of two adjacent links has the scraper blade that is used for the polished rod clearance.

Furthermore, a plurality of anti-slip sheets for increasing friction force are arranged on the circumferential direction of the extrusion wheel, so that the extrusion wheel is prevented from slipping.

Further, the inner ring surface of the scraper is provided with an arc-shaped rubber sheet, the scraper is made of magnetic materials, and the scraper is used for adsorbing iron scraps adhered to the outer side of the polished rod.

In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that: according to the polished rod sealing device, the first pressing seat and the second pressing seat are matched with the first conical disk root, so that the first disk root is subjected to radial extrusion force, the first disk root is directly extruded inwards by the radial extrusion force, the source of the radial extrusion force on the first disk root is more direct, and the polished rod sealing effect of the first disk root is improved; the first pressing seat is upwards extruded by using underground pressure, so that the first packing is deformed by extrusion force, the sealing effect of the first packing on a polished rod is improved, the interval of inspection time of operators is prolonged, and the practicability of the device is improved; the second packing is always extruded by the extrusion force of the second extrusion piece, the second packing is tightly attached to the polished rod, and the polished rod is sealed through the second packing and the first packing, so that the sealing effect of the polished rod is improved; the inclined bulge of the sealing plate is extruded by the fixing ring, so that the sealing plate is extruded by radial extrusion force, and the sealing plate is extruded and attached to the polished rod, thereby improving the practicability and safety of the device, avoiding the damage to surrounding workers due to the continuous upward flowing blowout of crude oil, and avoiding the waste of crude oil resources; the arc-shaped grooves of the two sealing sliding blocks are simultaneously extruded on the polished rod, the two sealing sliding blocks seal the polished rod, well blowout is avoided when the first packing and the second packing are replaced, the two sealing sliding blocks simultaneously extrude the front side and the rear side of the polished rod, the extrusion force of the two sealing sliding blocks on the polished rod is the same, and the reduction of the sealing effect caused by the difference of the extrusion force of the two sealing sliding blocks on the polished rod is avoided; impurities adhered to the polish rod are cleaned by utilizing a circular ring formed by the contact of the two scraping plates, so that the first packing is prevented from being polluted and corroded due to the fact that the polish rod is used for a long time and the impurities are accumulated on the first packing, and the sealing effect of the first packing on the polish rod is reduced; when the polished rod moves upwards, the two scraping plates swing away from each other, so that the garbage on the two scraping plates is prevented from being adhered to the polished rod again.

Drawings

Fig. 1 is a schematic perspective view of the present invention.

Fig. 2 is a schematic sectional perspective view of the present invention.

Fig. 3 is a schematic sectional perspective view of a third connecting shell according to the present invention.

Fig. 4 is a schematic diagram of a partially exploded perspective structure of the present invention.

Fig. 5 is a schematic view of a partial cross-sectional three-dimensional structure of the pressure extrusion mechanism of the present invention.

Fig. 6 is a schematic partial sectional perspective view of the pressure extrusion mechanism of the present invention.

Fig. 7 is a schematic three-dimensional structure diagram of the sealing blowout prevention mechanism of the invention.

Fig. 8 is a schematic perspective view of the manual sealing mechanism of the present invention.

Fig. 9 is a schematic cross-sectional three-dimensional structure diagram of the manual sealing mechanism of the present invention.

Fig. 10 is an enlarged perspective view of the invention at a.

Fig. 11 is a schematic perspective view of the polished rod cleaning mechanism of the present invention.

The parts are labeled as follows: 101-a base, 102-a first connecting shell, 103-a second connecting shell, 104-a third connecting shell, 105-a gland, 201-a first fixing block, 202-a first pressing seat, 203-a first extrusion piece, 204-a second pressing seat, 205-a first packing, 301-a second fixing block, 302-a first fixing pipe, 303-a piston, 304-a connecting pipe, 305-a return pipe, 306-a second fixing pipe, 307-a sliding rod, 401-a third fixing block, 402-a second extrusion piece, 403-a supporting plate, 404-a second packing, 405-a fixing ring, 406-a sealing plate, 501-a fixing shell, 502-a sealing slider, 503-a driving rotating shaft, 504-a rack, 505-a gear, 601-a fixing seat, 602-a rotating shaft, 603-an extrusion wheel, 604-a connecting frame, 605-a scraper.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. It should be understood that the preferred embodiments described herein are only for illustrating and explaining the present invention and are not to be considered as limiting the present invention.

Example 1

A polished rod sealing device with a cleaning function is disclosed, and is shown in figures 1-4, and comprises a base 101, wherein a flange plate is welded on the lower portion of the base 101, the base 101 is upwards in threaded connection with a first connecting shell 102, a second connecting shell 103 and a third connecting shell 104 in sequence, the base 101, the first connecting shell 102, the second connecting shell 103 and the third connecting shell 104 are connected to form a supporting shell, the upper portion of the third connecting shell 104 is in threaded connection with a gland 105, the polished rod penetrates through the gland 105 and is in sliding fit, the third connecting shell 104 is welded with a first fixing block 201, the polished rod penetrates through the first fixing block 201 and is in sliding fit, a first pressure seat 202 is in sliding connection with the third connecting shell 104, the first pressure seat 202 is in sealing contact with the third connecting shell 104 to prevent oil from overflowing from a gap between the first pressure seat 202 and the third connecting shell 104, the gland 105 is in bolted connection with a first extrusion piece 203, the first extrusion piece 203 is a spring, the lower part of the first extrusion piece 203 is bolted with a second pressure base 204, a first packing 205 is arranged between the first pressure base 202 and the second pressure base 204, the first packing 205 is sleeved on the polish rod and is in sliding sealing fit, the first extrusion piece 203 always extrudes the first pressure base 202 downwards so that the first pressure base 202 always extrudes the first packing 205 downwards, the first packing 205 is tightly attached to the polish rod under the action of extrusion force after being worn, the sealing effect of the first packing 205 on the polish rod is improved, meanwhile, the interval of inspection time of operators is prolonged under the action of extrusion force of the first extrusion piece 203, openings are arranged in the circumferential directions of the first pressure base 202 and the second pressure base 204, the openings of the first pressure base 202 and the second pressure base 204 are staggered, the inner ring surfaces of the first pressure base 202 and the second pressure base 204 are respectively matched with the outer ring surface of the first packing 205, and the first packing 205 is a conical surface with the diameter gradually reduced from the middle part to two sides, first pressure seat 202 and the cooperation of second pressure seat 204, along the radial extrusion to the centre of first packing 205, first packing 205 receives radial extrusion force and pastes tightly on the polished rod, the sealed effect of first packing 205 to the packing has been improved, first extruded article 203 utilizes the second to press seat 204 and first pressure seat 202 to extrude first packing 205, first packing 205 receives radial effort to sealed to the polished rod, be provided with the pressure extrusion mechanism who is used for extrudeing first packing 205 between base 101 and the third connection shell 104, pressure extrusion mechanism will take out the pressure transmission under the oil well to first pressure seat 202, be provided with in the second connection shell 103 and be used for supplementary sealed well blowout prevention mechanism, first connection shell 102 is provided with and is used for the manual sealing mechanism sealed to the polished rod.

An operator installs the device at an oil pumping port, a polished rod penetrates through the device, the operator rotates the gland 105 anticlockwise, the operator takes the gland 105, the first extrusion piece 203 and the second extrusion seat 204 out of the third connecting shell 104, the operator places the first packing 205 in the first pressure seat 202, the operator places the second pressure seat 204 and the first extrusion piece 203 into the third connecting shell 104, the operator rotates the gland 105 clockwise, the second pressure seat 204 moves downwards to extrude the first packing 205, the first packing 205 is extruded to be closely attached to the polished rod, the gland 105 is rotated clockwise to compress the first extrusion piece 203, the first extrusion piece 203 provides downward extrusion force to the second pressure seat 204 all the time in the using process of the device, the polished rod reciprocates up and down to cause abrasion of the first packing 205, the first extrusion piece 203 extrudes the second pressure seat 204 downwards, the second pressing base 204 moves towards the first pressing base 202, the first pressing base 202 and the second pressing base 204 move close to each other and press the first packing 205, two ends of the first packing 205 are extruded and deformed, the sealing effect of the polish rod is improved after the first packing 205 is deformed, meanwhile, the first pressing base 202 and the second pressing base 204 are matched with the conical first packing 205, so that the first packing 205 is subjected to radial extrusion force, the first packing 205 is directly extruded inwards by the radial extrusion force, the source of the radial extrusion force of the first packing 205 is more direct, the sealing effect of the first packing 205 on the polish rod is improved, after the device works for a period of time, an operator rotates the pressing cover 105 clockwise, the pressing cover 105 moves downwards to drive the first extruding piece 203 and the second pressing base 204 to move downwards along the third connecting shell 104, the second pressing base 204 moves downwards to further deform the first packing 205, and the first extruding piece 203 is compressed again, the first extruded part 203 through the installation provides the extrusion force to the second pressure seat 204 all the time, has prolonged the interval that operating personnel patrolled and examined the time, has improved the practicality of this device, and first coiled 205 uses wearing and tearing for a long time and need change, and operating personnel counter-clockwise unscrews gland 105, takes out the first coiled 205 of wearing and tearing from first pressure seat 202 to repeat the first coiled 205 that the above-mentioned operation was renewed.

Example 2

On the basis of embodiment 1, as shown in fig. 2, 5 and 6, the pressure extrusion mechanism includes a second fixed block 301, the second fixed block 301 is welded on the inner annular surface of the base 101, the second fixed block 301 is embedded with two first fixed pipes 302, pistons 303 are slidably disposed in the two first fixed pipes 302, the two first fixed pipes 302 are both connected with connecting pipes 304 in a threaded manner, one-way valves are mounted on the upper portions of the two connecting pipes 304, when the two pistons 303 are subjected to downhole pressure, the two pistons 303 respectively move upwards along the two first fixed pipes 302, the medium in the connecting pipes 304 passes through the one-way valves of the connecting pipes 304, after the downhole pressure is reduced, the two pistons 303 cannot be reset, return pipes 305 are communicated with the upper portions of the two first fixed pipes 302, the one-way valves of the two connecting pipes 304 are both located between two ports of the adjacent return pipes 305, ball valves are mounted on the two return pipes 305, when the first packing 205 needs to be replaced, an operator opens the ball valves of the two return pipes 305, media in the return pipes 305 flow downwards to reset the two pistons 303, the first fixing block 201 is embedded with two second fixing pipes 306, the two second fixing pipes 306 are respectively in threaded connection with the adjacent connecting pipes 304, sliding rods 307 are respectively arranged in the two second fixing pipes 306 in a sliding manner, the two sliding rods 307 are respectively in sealing fit with the adjacent second fixing pipes 306, the two sliding rods 307 are respectively fixedly connected with the first pressure base 202, the two first fixing pipes 302 are respectively communicated with the adjacent connecting pipes 304 and the adjacent second fixing pipes 306 to form a cavity, hydraulic oil is filled in the cavity, the two pistons 303 move upwards under pressure, the hydraulic oil in the connecting pipes 304 and the second fixing pipes 306 pushes the first pressure base 202 upwards through the two sliding rods 307, the first pressure base 202 extrudes the first packing 205 upwards, the sealing effect of the first disc root 205 on the polish rod is improved.

According to the figure 7, the sealing blowout prevention mechanism comprises a third fixing block 401, the third fixing block 401 is welded in the second connecting shell 103, a circular cavity is arranged in the middle of the third fixing block 401, the diameter of the cavity at the lower part of the third fixing block 401 is larger than that of the cavity at the upper part, a second extrusion part 402 is arranged at the lower part in the cavity of the third fixing block 401, the second extrusion part 402 is a spring, a support plate 403 is connected to the lower part in the cavity of the third fixing block 401 in a sliding manner, the support plate 403 is in sealing fit with the lower part of the cavity of the third fixing block 401, the second extrusion part 402 is welded with the support plate 403, a second packing 404 for sealing the polish rod is arranged at the upper part in the cavity of the third fixing block 401, the second packing 404 is wound on the polish rod and in sliding fit with the polish rod, an upward extrusion force is generated after the second extrusion part 402 is compressed, the support plate always extrudes the second packing 404 upwards, so that the second packing 403 is always attached to the polish rod, the sealing effect of the second packing 404 on the polish rod is improved, a fixing ring 405 is fixedly connected to the lower side surface of the third fixing block 401, a sealing plate 406 is arranged in the first connecting shell 102 in a sliding mode, the polish rod penetrates through the sealing plate 406 and is in sliding fit with the sealing plate 406, the sealing plate 406 and the fixing ring 405 are in extrusion sealing, the fixing ring 405 is made of hard material, a conical groove with a thick lower surface and a thin upper surface is formed in the fixing ring 405, an annular sealing ring is arranged in the conical groove of the fixing ring 405, a conical surface bulge is arranged on the upper portion of the sealing plate 406, a sealing ring made of soft material is arranged on the inner annular surface of the sealing plate 406, the sealing effect of the sealing plate 406 on the polish rod is improved, the inclined conical surface bulge of the sealing plate 406 is in fit sealing with the conical groove of the fixing ring 405, when the underground pressure is too high, the oil flows upwards and impacts the sealing plate 406, and the sealing plate 406 is upwards moved by the buoyancy of the oil and is in extrusion fit with the fixing ring 405, the conical groove of the fixing ring 405 is used for pressing the conical surface protrusion of the sealing plate 406 inwards, so that the sealing plate 406 is deformed and tightly attached to the polished rod, and well blowout caused by overlarge underground pressure is prevented.

As shown in fig. 8-10, the manual sealing mechanism includes a fixed casing 501, the fixed casing 501 is fixedly connected to the first connecting casing 102, the front and rear portions of the fixed casing 501 both penetrate through the first connecting casing 102 and are hermetically connected, a circular through hole is disposed in the middle of the fixed casing 501, the polish rod penetrates through the circular through hole of the fixed casing 501 and is in sliding fit with the circular through hole, sealing sliders 502 are slidably connected to the front and rear portions of the fixed casing 501, arc-shaped grooves are disposed on opposite sides of the two sealing sliders 502, a high-temperature-resistant flexible sealing ring is disposed in the arc-shaped grooves of the two sealing sliders 502, so as to improve the sealing effect of the two sealing sliders 502 on the polish rod, and prevent the two sealing sliders 502 from decreasing in sealing performance with the polish rod in a high-temperature and high-pressure environment, the arc-shaped grooves of the two sealing sliders 502 are used for sealing the polish rod, and the two sealing sliders 502 respectively slide with the inner side surface of the fixed casing 501 in a sealing manner, four long strip through holes are symmetrically formed in the upper side and the lower side of the fixed shell 501, a driving rotating shaft 503 is arranged on the front portion of the fixed shell 501 in a rotating mode, the driving rotating shaft 503 is in threaded connection with the front sealing sliding block 502, racks 504 are fixedly connected to the front side and the rear side of the two sealing sliding blocks 502 through connecting blocks, the connecting blocks of the four racks 504 are respectively connected into the four long strip through holes of the fixed shell 501 in a sliding mode, a gear 505 is arranged on the upper side face of the fixed shell 501 in a rotating mode, the two gears 505 are respectively meshed with the two adjacent racks 504, when the front sealing sliding block 502 moves backwards, the front sealing sliding block 502 is driven by the racks 504 and the adjacent gears 505, the front sealing sliding block 502 and the rear sealing sliding block 502 move close to each other at the same speed, the same extrusion force of the two sealing sliding blocks 502 on the polished rod is achieved, and the phenomenon that the sealing effect is reduced due to the fact that the extrusion force of the two sealing sliding blocks 502 on the polished rod is different is avoided.

In the process of reciprocating up and down of the polish rod, high pressure exists underground, the underground pressure acts on the two pistons 303, when the first disk root 205 is abraded, the two pistons 303 are stressed and extrude hydraulic oil in the first fixed pipe 302 upwards, the hydraulic oil in the first fixed pipe 302 and the hydraulic oil in the connecting pipe 304 both flow upwards and enter the second fixed pipe 306, the hydraulic oil flows upwards and extrudes the sliding rods 307, the two sliding rods 307 respectively move upwards along the adjacent second fixed pipe 306, the two sliding rods 307 push the first pressure seat 202 to move upwards, the first pressure seat 202 moves upwards and is matched with the second pressure seat 204 to extrude the first disk root 205, the first disk root 205 is deformed by the extrusion force and is tightly attached to the polish rod, when the underground pressure becomes small, the one-way valves in the two connecting pipes 304 prevent the hydraulic oil from flowing back, the first pressure seat 202 is extruded upwards by the underground pressure, the first disk root 205 is deformed by the extrusion force, and the sealing effect of the first disk root 205 on the polish rod is improved.

In this device use, second extruded piece 402 is in compression state all the time, causes the wearing and tearing of second packing 404 inner ring face during polished rod up-and-down reciprocating motion, under the extrusion force of second extruded piece 402, makes second packing 404 receive the extrusion all the time, and second packing 404 closely laminates on the polished rod, seals the polished rod jointly through second packing 404 and first packing 205, improves the sealed effect of polished rod.

When first packing 205 and second packing 404 need to be changed, operating personnel anticlockwise rotates drive pivot 503, drive pivot 503 is driving anterior sealing slide block 502 to slide backward through the screw thread, anterior sealing slide block 502 passes through rack 504 and gear 505 transmission, make the sealing slide block 502 at rear portion move forward simultaneously, the soft sealing ring of high temperature resistance in the arc wall of two sealing slide blocks 502 extrudes simultaneously on the polished rod, two sealing slide blocks 502 seal to the polished rod, the blowout has been avoided taking place when changing first packing 205 and second packing 404, two sealing slide blocks 502 extrude both sides around the polished rod simultaneously and the extrusion force is the same, avoid two sealing slide blocks 502 to lead to sealed effect to reduce to the extrusion force difference of polished rod.

When changing first packing 205 and second packing 404, if pressure increases in the pit makes crude oil pass through two seal slide 502, crude oil flows upwards along the polished rod, closing plate 406 receives the buoyancy of crude oil and moves up along the polished rod, the slope arch of closing plate 406 inserts in the bell groove of solid fixed ring 405, the slope arch of closing plate 406 receives the extrusion of solid fixed ring 405, make closing plate 406 receive radial extrusion force laminating on the polished rod, the practicality and the security of this device have been improved, avoided crude oil to continue to flow the well blowout injury staff on every side upwards, avoid crude oil resource to cause the waste simultaneously.

An operator rotates the gland 105 counterclockwise and takes out the first packing 205, the operator opens the ball valves of the two return pipes 305, the operator resets the two sliding rods 307 connected to the first pressure base 202, hydraulic oil in the two second fixed pipes 306 flows back into the two first fixed pipes 302 through the two return pipes 305, the pistons 303 in the two first fixed pipes 302 reset, the operator closes the ball valves of the two return pipes 305, the operator then loses the communication between the upper ends of the two connecting pipes 304 and the two second fixed pipes 306, the operator rotates the third connecting shell 104 counterclockwise, the third connecting shell 104 loses the connection with the second connecting shell 103, the worn second packing 404 is taken out of the cavity of the third fixed block 401, the second extrusion piece 402 drives the support plate 403 to move upward, the operator replaces a new second packing 404 in the cavity of the third fixed block 401, the operator rotates the third connecting shell 104 clockwise again to connect with the second connecting shell 103, the third connecting shell 104 rotates downward to compress the second extrusion piece 201, and the second packing 404 is compressed downward.

The operator repeats the above operation to replace the new first packing 205 and turn the gland 105 clockwise and connect to the third connecting casing 104, then the operator re-connects the two connecting pipes 304 to the adjacent second fixed pipe 306, and the operator re-starts the pumping unit to reciprocate the sucker rod up and down to continue producing crude oil.

Example 3

On the basis of embodiment 2, according to fig. 11, still include polished rod clearance mechanism, polished rod clearance mechanism sets up on gland 105, polished rod clearance mechanism is used for clearing up the rubbish of adhesion on the polished rod, polished rod clearance mechanism includes two fixing bases 601, two fixing base 601 symmetry formula bolted connection are on gland 105, two fixing bases 601 are all rotated and are connected with axis of rotation 602, both ends difference bolt has a plurality of magnet piece around two axis of rotation 602, two axis of rotation 602 are all rotated and are connected with extrusion wheel 603, extrusion wheel 603 circumference bolted connection has a plurality of antiskid sheets that are used for increasing frictional force, prevent that extrusion wheel 603 from skidding, avoided extrusion wheel 603 and sucker rod to take place to skid and cause two scraper blades 605 can not contact the polished rod simultaneously, two equal bolted connection of axis of rotation 602 have a plurality of magnet piece around two extrusion wheels 603, two extrusion wheels 603 pass through the cooperation of power of magnetic force, two adjacent extrusion wheels 603 are driving adjacent axis of rotation 602 to rotate through magnetic force when rotating, two equal bolted connection of axis of rotation 602 have two links 604, two links are connected with the equal bolted connection of bolt and are used for the scraper cleaning up the magnetic force of the scraper of the smooth rod clearance of the scraper and are used for adsorbing the magnetic attraction of the magnetic debris on the polished rod 605, the polished rod clearance rubber piece, two magnetic foreign matter outside the scraper 605, two magnetic attraction rubber pieces of the polished rod 605, two adjacent magnetic attraction rubber pieces are connected with the polished rod.

When the polish rod moves downwards, the two extrusion wheels 603 are rotated by friction force, the two extrusion wheels 603 respectively drive the adjacent rotating shafts 602 to rotate by magnetic attraction force, the two rotating shafts 602 rotate and respectively approach to swing through the connecting frames 604 on the two rotating shafts, the two scraping plates 605 are contacted to form a circular ring for cleaning impurities adhered to the polish rod, the polish rod can adsorb dust impurities in air in the process of reciprocating up and down due to the adhesion of lubricating oil on the polish rod, the impurities can be accumulated on the first packing 205 after the polish rod is used for a long time, so that the first packing 205 is polluted and corroded, the sealing effect of the first packing 205 on the polish rod is reduced, if the iron filings impurities are adhered to the polish rod, the polish rod can be worn for a long time after the iron filings impurities enter the first packing 205 along with the polish rod, and the polish rod continues to move downwards, the rubber sheet on two scraper blades 605 clears up the impurity of adhesion on the polished rod, the magnetic force of two scraper blades 605 can adsorb the metal debris on the polished rod simultaneously, because through magnetic force cooperation between two extrusion wheels 603 and the adjacent axis of rotation 602, all when two scraper blades 605 contact the back, the polished rod drives two extrusion wheels 603 and continues to rotate, when polished rod antiport, the polished rod drives two extrusion wheels 603 antiport, two extrusion wheels 603 are driving adjacent axis of rotation 602 antiport through magnetic force respectively, make two scraper blades 605 keep away from the swing mutually, the rubbish on two scraper blades 605 has been avoided adhering on the polished rod again, the non-slip sheet on two extrusion wheels 603 increases and the frictional force of polished rod, the cleaning effect of two scraper blades 605 to the polished rod has been improved, it causes two scraper blades 605 can not contact the polished rod simultaneously to have avoided extrusion wheel 603 and sucker rod to take place to skid.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A polished rod sealing device with a cleaning function is characterized by comprising a base (101), a flange plate is arranged at the lower part of the base (101), the base (101) is sequentially connected with a first connecting shell (102), a second connecting shell (103) and a third connecting shell (104), the base (101), the first connecting shell (102), the second connecting shell (103) and the third connecting shell (104) are connected to form a supporting shell, the upper part of the third connecting shell (104) is in threaded connection with a gland (105), a polished rod penetrates through the gland (105) and is in sliding fit, the third connecting shell (104) is provided with a first fixing block (201), the polished rod penetrates through the first fixing block (201) and is in sliding fit, a first pressing seat (202) is arranged in the third connecting shell (104), the first pressing seat (202) is in sealing contact with the third connecting shell (104), the gland (105) is provided with a first extruding part (203), the lower part of the first extruding part (203) is provided with a second pressing seat (204), a first packing (202) is sleeved between the first pressing seat (202) and a second packing (205) is radially extruded by the first extruding part (205), and the first packing (205) is radially extruded by the first extruding part (205), a pressure extrusion mechanism for extruding a first disc root (205) is arranged between the base (101) and the third connecting shell (104), the pressure extrusion mechanism transmits the pressure under the pumping well to the first pressure base (202), a sealing blowout prevention mechanism for auxiliary sealing is arranged in the second connecting shell (103), and a manual sealing mechanism for sealing the polish rod is arranged in the first connecting shell (102);

the polished rod cleaning mechanism is arranged on the gland (105), and is used for cleaning garbage adhered to a polished rod, and comprises two fixing seats (601), the two fixing seats (601) are symmetrically and fixedly connected to the gland (105), the two fixing seats (601) are rotatably connected with rotating shafts (602), two ends of the two rotating shafts (602) are fixedly connected with a plurality of magnet blocks respectively, the two rotating shafts (602) are rotatably connected with extrusion wheels (603), the two extrusion wheels (603) are provided with a plurality of magnet blocks, the two extrusion wheels (603) are matched with adjacent rotating shafts (602) through magnetic attraction, the two rotating shafts (602) are provided with two connecting frames (604), and the two adjacent connecting frames (604) are fixedly connected with scrapers (605) for cleaning the polished rod;

the inner ring surface of the scraper (605) is provided with an arc rubber sheet, the scraper (605) is made of magnetic material, and the scraper (605) is used for adsorbing iron scraps adhered to the outer side of the polished rod.

2. The polish rod sealing device with the cleaning function as claimed in claim 1, wherein the first packing (205) is a conical surface with a diameter gradually decreasing from the middle to both sides, the first pressing seat (202) and the second pressing seat (204) are circumferentially provided with notches, the notches of the first pressing seat (202) and the second pressing seat (204) are staggered, and the inner annular surfaces of the first pressing seat (202) and the second pressing seat (204) are respectively adapted to the outer annular surface of the first packing (205).

3. The polish rod sealing device with the cleaning function as claimed in claim 1, wherein the pressure extrusion mechanism comprises a second fixed block (301), the second fixed block (301) is fixedly connected in the base (101), the second fixed block (301) is provided with a plurality of first fixed pipes (302), a piston (303) is slidably arranged in each first fixed pipe (302), each first fixed pipe (302) is communicated with a connecting pipe (304), a check valve is mounted on the upper portion of each connecting pipe (304), a return pipe (305) is communicated with the upper portion of each first fixed pipe (302), the check valve of each connecting pipe (304) is located between two ports of the adjacent return pipe (305), a ball valve is mounted on each return pipe (305), the first fixed block (201) is provided with a plurality of second fixed pipes (306), each second fixed pipe (306) is respectively communicated with the adjacent connecting pipe (304), a sliding rod (307) is slidably arranged in each second fixed pipe (306), each sliding rod (307) is respectively communicated with the adjacent second fixed pipe (306), the sliding rods (306) are respectively and are in sealing fit with the cavities of the first fixed pipes (202), and the connecting pipes (202) are filled with the adjacent hydraulic oil.

4. The polish rod sealing device with the cleaning function according to claim 3, wherein the sealing blowout prevention mechanism comprises a third fixing block (401), the third fixing block (401) is arranged in the second connecting shell (103), a circular cavity is arranged in the middle of the third fixing block (401), the diameter of a lower cavity of the third fixing block (401) is larger than that of an upper cavity, a second extrusion piece (402) is arranged at the lower part in the cavity of the third fixing block (401), a support plate (403) is slidably connected to the lower part in the cavity of the third fixing block (401), the support plate (403) is in sealing fit with the cavity of the third fixing block (401), the second extrusion piece (402) is fixedly connected with the support plate (403), a second packing (404) for sealing the polish rod is arranged at the upper part in the cavity of the third fixing block (401), the second packing (404) is wound on the polish rod and slidably fitted therewith, a fixing ring (405) is arranged on the lower side surface of the third fixing block (401), a sealing plate (406) is slidably arranged in the first connecting shell (102), the sealing plate (406) penetrates through the sealing plate (406) and slidably fits therewith, and the sealing plate (405) extrudes the sealing plate (405) to seal the fixing block.

5. The polished rod sealing device with the cleaning function as claimed in claim 4, wherein the fixing ring (405) is made of hard material, the fixing ring (405) is provided with a tapered groove with a thick lower surface and a thin upper surface, the tapered groove of the fixing ring (405) is internally provided with an annular sealing ring, the upper part of the sealing plate (406) is provided with a tapered surface bulge, the inner annular surface of the sealing plate (406) is provided with a sealing ring made of soft material, and the tapered surface bulge of the sealing plate (406) is matched and sealed with the tapered groove of the fixing ring (405) to prevent blowout caused by over-high downhole pressure.

6. The polished rod sealing device with the cleaning function as claimed in claim 4, wherein the manual sealing mechanism comprises a fixed shell (501), the fixed shell (501) is arranged in the first connecting shell (102), a circular through hole is formed in the middle of the fixed shell (501), the polished rod penetrates through the circular through hole of the fixed shell (501) and is in sliding fit with the circular through hole, sealing sliders (502) are slidably connected to the front and back of the fixed shell (501), arc-shaped grooves are formed in opposite sides of the two sealing sliders (502), the arc-shaped grooves of the two sealing sliders (502) are used for sealing the polished rod, the two sealing sliders (502) respectively slide with the inner side surface of the fixed shell (501) in a sealing manner, four long through holes are symmetrically formed in the upper and lower sides of the fixed shell (501), a driving rotating shaft (503) is arranged in the front of the fixed shell (501) in a rotating manner, the driving rotating shaft (503) is in threaded connection with the sealing slider (502) in the front, racks (504) are fixedly connected to the front and back of the two sealing sliders (502) through connecting blocks, the connecting blocks of the four connecting blocks (504) are respectively slidably connected to the four long through holes of the fixed shell (501), two gears (505) are respectively engaged with the two adjacent racks (504) on the upper side surface of the fixed shell (501).

7. The polish rod sealing device with cleaning function according to claim 6, wherein a high temperature resistant soft sealing ring is provided in the arc-shaped groove of each of the two sealing sliders (502).

8. The polish rod sealing device with a cleaning function according to claim 1, wherein the extrusion wheel (603) is provided with a plurality of anti-slip pieces for increasing friction force in a circumferential direction to prevent the extrusion wheel (603) from slipping.