CN2561917Y - Translational polish rod sealer - Google Patents

Abstract

The utility model discloses an evenly-moving polished rod sealer that can solve the seal leakage problem of polished rod of the beam pumping unit. The sealer comprises a pedestal body, an outer pressing cover, a pressing block, a flexible seal ring, as well as a seal packing box. The seal packing box is provided with a seal packing, the lower part is provided with a lock nut, and the upper side is provided with an upper pressing cover. The seal packing box is positioned on the pedestal body. The pedestal body, the outer pressing cover and the pressing block constitute the sealer fixed part. The seal packing box, the lock nut, and upper pressing cover, and the seal packing constitute the sealer movable part. The flexible seal ring is connected with the two. The utility model makes the seal packing box evenly move with the polished rod, thereby ensuring the polished rod only conduct coaxial seesaw motion in the seal packing box nearly without eccentric wear. The utility model saves considerable sealing materials, avoids reduction of oil extraction caused by shutdown, so as to have significant economic benefits. The utility model completely eliminates the environmental pollution caused by leakage of crude oil, and also avoids the waste of resources.

Description

The parallel-moving type polished rod sealer

(1) technical field

The utility model relates to the leak-tight seal device of oil field beam pumping unit.

(2) background technology

The oil-field oil pumper overwhelming majority is a beam pumping unit, " machine of kowtowing " that promptly is commonly called as.Need sealing to prevent crude oil leakage between the polished rod of its connection sucker rod and the oil well mouth.At present all is to adopt to add the sealed rubber ring that is enclosed within on the polished rod in the box body and realize sealing, the leakage that being worn fast of these glue rings caused becomes a great problem in oil field.Oil pumper at work, the sucker rod of hundreds of rice, several kms can produce when moving up and down and irregularly radially wobble, and forces also irregular fluctuation thereupon of polished rod, produces the very big fluctuating load that acts on radially, causes polished rod that sealed rubber ring is produced eccentric wear.Secondly, oil pumper requires polished rod eye and the polished rod and the well head centering of clamping polished rod when mounted, but this can only carry out the centering under dynamically of also having no idea at present under static state.And the centering under this static state can not be accurately, and often deviation is very big, and this deviation has been quickened the eccentric wear of sealed rubber ring.Eccentric wear makes very quick-wearing of glue ring part, gaps.Though can compress the glue ring by the way that screws gland, dwindle the slit, two, three times are then powerless later on.The oil that has pressure in the well comes out along slot leakage, has polluted environment, has wasted resource, also makes a very bad impression to carrying out production strictly in line with rules and regulations.Workpeople's gland of having to frequently screw often must be shut down and be changed the glue ring in three or five days, and both waste material had increased labour intensity again, more influence production efficiency.

For this reason, have various people constantly to try every possible means to address this problem, the swing that generally believes polished rod is the main cause that causes leakage.What have takes mandatory way, forces polished rod not swung, but very big to the polished rod surface damage, the damage of glue ring has been aggravated on scratch polished rod surface on the contrary as file.What have then adds the ring that high-abrasive material is done in box, desire to make polished rod not swing, but its life-span is very short, and the replacing process is loaded down with trivial details, and expense is too high, influences ordinary production equally.Facts have proved that these ways often can only be alleviated eccentric wear the short time, can't tackle the problem at its root, instead can cause new problem.Thereby, the fixedly boxlike sealing device of the still interior dress rubber ring that present pumping unit of well generally uses.

(3) summary of the invention

The utility model provides a kind of parallel-moving type polished rod sealer that can solve beam pumping unit polished rod leakage problem.The technical scheme that adopts is: the parallel-moving type polished rod sealer comprises briquetting, flexible seal ring and the external poured sealed stuffing box below pedestal, the outer gland that is connected with pedestal and the outer gland.Have in the sealed stuffing box and can annotate the formula airtight and watertight padding, locking nut is arranged at the bottom, and upper press cover is arranged above.Pedestal is threaded with existing once sealing box, and sealed stuffing box is located on the pedestal, and the pedestal periphery has screw thread, and outer gland is screwed on the pedestal, briquetting is arranged below the outer gland, and the outer rim of flexible seal ring is pressed on the pedestal arris; Packing seal box lower, outer perimeter has boss, near the boss upside screw thread is arranged, and locking nut is screwed on the screw thread of sealed stuffing box bottom, and the flexible seal ring inner edge is pressed on the boss of packing seal box lower, outer perimeter; Between packing seal box and the outer gland, between locking nut and outer gland, the briquetting slit is arranged all, form labyrinth structure between locking nut and outer gland, the briquetting; Sealed stuffing box inside is full of airtight and watertight padding, and the sealed stuffing box upper outside has screw thread, and upper press cover is screwed in sealed stuffing box top, with airtight and watertight padding be pressed on polished rod around.Wherein, pedestal, outer gland, briquetting constitute the standing part of sealer; External poured sealed stuffing box, locking nut, upper press cover and the moveable part that can annotate formula airtight and watertight padding formation sealer.Be connected by flexible seal ring between the two.

Because the utility model is divided into fixing and removable two parts, sealed stuffing box can freely move as the plane with polished rod, and can make wallowing motion with polished rod, guaranteed that between polished rod and the sealed stuffing box be relative static diametrically, only do stable coaxial moving up and down between polished rod and the filler, almost do not have eccentric wear; The radially fluctuating load that causes that radially wobbles of polished rod is absorbed by flexible seal ring, and no longer to sealing material generation effect, the sealing material is only done normal uniform wear at circumference with polished rod, and this amount is very little.Produce and to cause the slit of leakage to need long time.And being denuded part can compress and be replenished from outside after-teeming by screwing upper press cover, and this can carry out under non-stop-machine situation at an easy rate.External poured airtight and watertight padding stable chemical performance is used consistency for a long time, and substantial performance is good.Than before frequent replacing glue ring, saved a large amount of encapsulants, avoided the minimizing of the oil production rate that causes because of shutdown, its economic benefit is very remarkable.Also alleviated simultaneously working strength of workers greatly, can expansion department well quantity, raise labour productivity.Eliminate the environment pollution that causes because of crude oil leakage up hill and dale, realized carrying out production strictly in line with rules and regulations, avoided the wasting of resources.These all are that people make great efforts for it and be unredeemed for these years.

(4) description of drawings

Fig. 1 is existing fixedly boxlike oil-extractor polish-rod schematic diagram of sealing device;

Fig. 2 is a structural representation of the present utility model.

(5) specific embodiment

Among Fig. 1, the built-in oil resistant cushion rubber of seal box makes cushion rubber produce distortion by screwing upper press cover, is close to polished rod 1 and seals.Generally be divided into two seals, its one seal box 4 is connected with well head 2 by flange 3, and built-in resistant to elevated temperatures graphite rubber ring 5 by screwing the second road seal box 7, compresses glue ring 5 by differential 6.What the second road seal box, 7 the insides were adorned is oil resistant rubber ring 8, by screwing gland 9, through differential 10 the glue ring is compressed.This upper and lower two seals box all is fixed on the oil well, is Immobile.

Among Fig. 2,1 is polished rod, and 2 is well head, and 4 is existing once sealing box, and it is connected with well head 2 by flange 3.Pedestal 11 is threaded with existing once sealing box 4, external poured sealed stuffing box 19 is located on the pedestal 11, for reducing the wearing and tearing between the component, between sealed stuffing box and pedestal, be added with anti-wear gasket, last anti-wear gasket 13 is added in stuffing box 19 times, can swing with box, following anti-wear gasket 12 is fixed in above the pedestal 11.Anti-wear gasket 12,13 adopts the high-performance antifriction material.Pedestal 11 peripheries have screw thread, and outer gland 15 is screwed on the pedestal 11, briquetting 16 are arranged below the outer gland 15; Sealed stuffing box 19 lower, outer perimeter have screw thread, locking nut 18 is screwed in the sealed stuffing box bottom, briquetting 16 and locking nut 18 are pressed on flexible seal ring 14 on the boss of pedestal 11 arris and packing seal box lower, outer perimeter, and the selection of flexible seal ring 14 will guarantee oil resistant, high temperature resistant, anti-complications, high strength.Shapes such as U-shaped, L shaped, S shape are adopted in flexible seal ring 14 cross sections.Airtight and watertight padding 21 has material hole 20 for can annotate the formula filler on the sidewall of external poured sealed stuffing box 19, when take place leaking in the running or the airtight and watertight padding of hole after-teeming from then on regularly, operation is very easy, need not shut down.Selected encapsulant is solid-state, uses special tool, injects from sprue 20 under certain pressure.The oil-scraping ring 17 that different materials makes is housed in the stuffing box and can annotates formula airtight and watertight padding 21, sealed stuffing box 19 upper outside have screw thread, and upper press cover 22 is screwed in sealed stuffing box 19 tops, by differential 23 with airtight and watertight padding be pressed on polished rod 1 around.In use, can be by screwing gland 22 with the airtight and watertight padding compacting, also can be from material hole 20 after-teemings.

Can structurally to guarantee under enough displacements, to move freely along with the purpose of polished rod 1 free shift for reaching external poured sealed stuffing box 19, not block not self-locking.Leak for guaranteeing when high pressure-temperature is annotated vapour, not produce at flexible seal ring 14 places, last anti-wear gasket 13 with the bar swing is very little with the gap of polished rod, the lifting force that makes progress that the steam that is passed through produces is little, gravity less than crude oil in whole sucker rod and the pipe, can guarantee that like this moveable part can be pressed on the following anti-wear gasket 12 of standing part, smooth smooth surface between them is a good sealing surface, can stop steam to pass through thus.For the purpose of safe, can screw gland 22 when shutting down notes vapour or, make the thrust of 21 pairs of polished rods 1 of airtight and watertight padding bigger through the powerful again after-teeming sealing of material hole 20 material, also can on gland 22, add holding rod device (oil well common tool).Produce distortion even flexible seal ring 14 stands high-temperature steam,, also can not produce the problem of breakdown leakage steam owing to there is the counterpart of labyrinth structure to stop that the gap is very little.Moveable part had both been done the horizontal direction translation, again because the pole rise and fall thereupon of airtight and watertight padding.By the variation of reciprocating movement velocity as can be known, from last (descending) dead point downwards (on) initial velocity increases gradually by zero during motion, in this segment distance in upper and lower displacement is limited in very low range, because it is minimum that speed increases, the impact force that produces is also very little, this is individual process very stably, can not produce correlated parts and destroy.

Claims (4)

1, a kind of parallel-moving type polished rod sealer is characterized in that outer gland (15) and following briquetting (16), flexible seal ring (14) and the external poured sealed stuffing box (19) of outer gland (15) that it comprises pedestal (11), is connected with pedestal; Have in the sealed stuffing box (19) and can annotate formula airtight and watertight padding (21), locking nut (18) is arranged at the bottom, and upper press cover (22) is arranged above; Pedestal (11) is threaded with existing once sealing box (4), sealed stuffing box (19) is located on the pedestal (11), the pedestal periphery has screw thread, outer gland (15) is screwed on the pedestal (11), briquetting (16) is arranged below the outer gland (15), the outer rim of flexible seal ring (14) is pressed on pedestal (11) arris; Packing seal box (19) lower, outer perimeter has boss, near the boss upside screw thread is arranged, and locking nut (18) is screwed on the screw thread of sealed stuffing box bottom, and flexible seal ring (14) inner edge is pressed on the boss of sealed stuffing box lower, outer perimeter; Between sealed stuffing box (19) and the outer gland (15), locking nut (18) and outer gland (15), briquetting all have the slit between (16), and locking nut (18) and outer gland (15), briquetting form labyrinth structure between (16); Packing seal box (19) inside is full of airtight and watertight padding (21), and packing seal box (19) upper outside has screw thread, and upper press cover (22) is screwed in packing seal box (19) top, with airtight and watertight padding be pressed on polished rod (1) around; Wherein, pedestal (11), outer gland (15), briquetting (16) constitute the standing part of sealer, sealed stuffing box (19), locking nut (18), upper press cover (22) and airtight and watertight padding (21) constitute the moveable part of sealer, are connected by flexible seal ring (14) between the two.

2, parallel-moving type polished rod sealer according to claim 1 is characterized in that flexible seal ring (14) adopts the U-shaped cross section.

3, parallel-moving type polished rod sealer according to claim 1 is characterized in that on the sidewall of external poured sealed stuffing box (19) material hole (20) being arranged.

4, parallel-moving type polished rod sealer according to claim 1 is characterized in that being added with anti-wear gasket between sealed stuffing box and pedestal, and last anti-wear gasket (13) is added under the stuffing box (19), and following anti-wear gasket (12) is fixed in above the pedestal (11).