阅读说明：本技术 注脂可调直径活塞总成 (Grease injection diameter-adjustable piston assembly ) 是由 林吉庆 李伟 赖旭东 昌爱刚 于 2020-06-16 设计创作，主要内容包括：本发明涉及一种注脂可调直径活塞总成,属石油钻采泥浆泵配件技术领域。它由泥浆泵拉杆、活塞铁芯、锁紧螺母、尼龙支撑环、活塞胶皮、胶皮压紧环、注水快速接头、高压胶泥注入接头组成,活塞铁芯的小直径端上装有活塞胶皮,活塞胶皮的底部装有尼龙支撑环,前沿装有胶皮压紧环；活塞铁芯的大直径端制作有冷却水注入孔和注水快速接头。本发明随着活塞胶皮变形力矩的变化可通过注入胶泥量进行调节,缸套的磨损程度可适当放大,不仅增加了单只活塞的使用寿命,而且将现有缸套活塞的使用寿命提高3-4倍；避免了现有缸套活塞重建活塞皮碗的密封时要打开缸盖导致泥浆流出浪费且污染环境的问题,节省了生产成本和时间,减轻了劳动强度。(The invention relates to a grease injection diameter-adjustable piston assembly, and belongs to the technical field of petroleum drilling and production slurry pump accessories. The mud pump comprises a mud pump pull rod, a piston iron core, a locking nut, a nylon support ring, a piston rubber, a rubber compression ring, a water injection quick connector and a high-pressure cement injection connector, wherein the piston rubber is arranged on the small-diameter end of the piston iron core, the nylon support ring is arranged at the bottom of the piston rubber, and the rubber compression ring is arranged at the front edge of the piston rubber; and a cooling water injection hole and a water injection quick connector are formed in the large-diameter end of the piston iron core. The invention can be adjusted by injecting the amount of the cement along with the change of the deformation moment of the rubber of the piston, the abrasion degree of the cylinder sleeve can be properly amplified, the service life of a single piston is prolonged, and the service life of the piston of the existing cylinder sleeve is prolonged by 3-4 times; the problems that slurry flows out and is wasted and the environment is polluted due to the fact that a cylinder cover needs to be opened when the sealing of a piston leather cup is rebuilt by an existing cylinder sleeve piston are solved, the production cost and time are saved, and the labor intensity is reduced.)

1. The utility model provides an annotate adjustable diameter piston assembly of fat, it comprises slush pump pull rod (2), piston core (3), lock nut (4), nylon support ring (5), piston rubber (6), rubber clamp ring (7), water injection quick-operation joint (8), high-pressure cement gum injection joint (9), piston core (3) are equipped with to the one end of slush pump pull rod (2), and piston core (3) are set up through lock nut (4), its characterized in that: the piston iron core (3) is of a stepped cylinder structure, a piston rubber (6) is arranged at the small-diameter end of the piston iron core (3), a nylon support ring (5) is arranged at the bottom of the piston rubber (6), a rubber compression ring (7) is arranged at the front edge of the piston rubber (6), and the rubber compression ring (7) is clamped through an elastic clamp spring (16); a cooling water injection hole (12) is formed in one side of a through hole in the large-diameter end of the piston iron core (3), a water injection quick connector (8) is installed at the outer end of the cooling water injection hole (12), the inner end of the cooling water injection hole (12) is communicated with an inner annular water channel (13), radial water channels (14) are uniformly formed in the inner annular water channel (13), and the radial water channels (14) are communicated with an outer annular cooling water channel (15); the through-hole opposite side of the big diameter end of piston core (3) is made and is had clay filling hole (10), and the outer end in clay filling hole (10) is equipped with high-pressure clay and is annotated joint (9), and the inside end intercommunication piston rubber (6) of clay filling hole (10) are gone up cement and are supplyed cavity ring (11).

2. A grease filled adjustable diameter piston assembly according to claim 1, wherein the cross-sectional shape of the mastic supplementary hollow ring (11) is a circular or trapezoidal hole shape.

3. A grease injection adjustable diameter piston assembly according to claim 1, wherein the mastic injection hole (10) has a horizontal hole structure when connected to the mastic supplementary hollow ring (11) having a circular hole shape in cross section and has an inclined hole structure when connected to the mastic supplementary hollow ring (11) having a trapezoidal hole shape in cross section.

4. The grease-injection adjustable-diameter piston assembly according to claim 1, wherein the joint surface of the piston rubber (6) and the inner wall of the mud pump cylinder sleeve (1) is an oblique conical surface, and the axial section of the piston rubber is horn-shaped.

Technical Field

The invention relates to a grease injection diameter-adjustable piston assembly, and belongs to the technical field of petroleum drilling and production slurry pump accessories.

Background

The piston assembly of the prior well-known and common slurry pump in the market is composed of a supporting iron core, a rubber sealing leather cup and the like, and the piston is mainly sealed by tensioning, attaching and sealing between the piston rubber sealing leather cup and a cylinder sleeve, namely, the rubber sealing leather cup is slightly larger than the inner diameter of the cylinder sleeve in size, the rubber sealing leather cup is compressed and deformed in the cylinder sleeve in a proper amount after being assembled, and the compression deformation is utilized to play a role in sealing. When the piston reciprocates in the cylinder sleeve and generates pressure, the rubber sealing leather cup of the piston and the cylinder sleeve are abraded for a long time, the size of the outer edge of the leather cup is continuously reduced and deforms, meanwhile, the inner diameter of the cylinder sleeve is correspondingly ground to be large, and at the moment, the deformation moment between the rubber sealing leather cup of the piston and the cylinder sleeve is insufficient to generate a gap, so that pressure leakage is formed, the damage of a wear-resistant part is accelerated, and finally the sealing effect is difficult to achieve. On the other hand, the sealing structure cannot be repaired once the puncture occurs, the service life is short, and only the new piston and the new cylinder sleeve can be replaced after a gap is formed, so that the production cost is increased, and the labor cost and the equipment maintenance time are increased.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a method for filling high-pressure daub into a daub supplementing hollow ring of a piston rubber through a daub filling hole so as to force the piston rubber to extrude outwards along the direction, thereby realizing the adjustment of the deformation moment of the piston rubber and prolonging the service life of a leather cup; and meanwhile, cooling water is injected through the cooling water injection port to forcibly cool, clean and lubricate the part of the piston rubber and the inner wall of the mud pump cylinder sleeve, which generates sealing friction, so that the grease injection adjustable-diameter piston assembly with the effect of prolonging the service life of the piston rubber is achieved.

The invention realizes the purpose through the following technical scheme:

the utility model provides an annotate adjustable diameter piston assembly of fat, it comprises slush pump pull rod, piston core, lock nut, nylon support ring, piston rubber, rubber clamp ring, water injection quick-operation joint, high-pressure clay injection joint, and piston core is equipped with to the one end of slush pump pull rod, and piston core sets up its characterized in that through lock nut: the piston iron core is of a stepped cylinder structure, a piston rubber is arranged at the small-diameter end of the piston iron core, a nylon support ring is arranged at the bottom of the piston rubber, a rubber compression ring is arranged at the front edge of the piston rubber, and the rubber compression ring is clamped tightly through an elastic clamp spring; a cooling water injection hole is formed in one side of a through hole in the large-diameter end of the piston iron core, a water injection quick connector is installed at the outer end of the cooling water injection hole, the inner end of the cooling water injection hole is communicated with an inner annular water channel, uniformly distributed radial water channels are uniformly distributed on the inner annular water channel, and the radial water channels are communicated with an outer annular cooling water channel; the through-hole opposite side preparation of the big diameter end of piston core has the daub filling hole, and the outer end of daub filling hole is equipped with high-pressure daub and is annotated the joint, and the inside end intercommunication daub on the piston rubber in the daub filling hole supplyes the cavity ring.

The section of the daub supplementing hollow ring is in a circular hole shape or a trapezoid hole shape.

The daub injection hole is horizontal hole structure when being connected with the daub supplementary cavity ring that the cross-sectional shape is the round hole shape, is the inclined hole structure when being connected with the daub supplementary cavity ring that the cross-sectional shape is trapezoidal hole shape.

The joint surface of the piston rubber and the inner wall of the mud pump cylinder sleeve is an oblique conical surface, and the axial section of the piston rubber is in a horn shape.

Compared with the prior art, the invention has the beneficial effects that:

the grease-injection adjustable-diameter piston assembly can be adjusted by injecting the amount of the cement along with the change of the deformation moment of the piston rubber, the abrasion degree of the cylinder sleeve can be properly amplified, the service life of the piston rubber is prolonged, the service life of a single piston is prolonged, the service life of the existing cylinder sleeve piston is prolonged by 3-4 times, the piston can be rebuilt again without disassembling parts such as a cylinder cover of a hydraulic end when the sealing of the piston cup needs to be rebuilt again, the problem that the slurry flows out and is wasted due to the fact that the cylinder cover is opened when the sealing of the piston cup is rebuilt again by the existing cylinder sleeve piston is avoided, the problem that the slurry falls to the ground and pollutes the environment is solved, a large amount of production cost and time are saved, and the labor intensity of.

Drawings

FIG. 1 is a schematic cross-sectional view of a grease injection adjustable diameter piston assembly;

FIG. 2 is a schematic sectional view of a grease injection adjustable diameter piston assembly after being cut;

FIG. 3 is a schematic cross-sectional view of a cement supplement hollow ring of a grease injection adjustable diameter piston assembly with a trapezoidal cross-section.

In the figure: 1. mud pump cylinder liner, 2, mud pump pull rod, 3, piston core, 4, lock nut, 5, nylon support ring, 6, piston rubber, 7, rubber clamp ring, 8, water injection quick-operation joint, 9, high-pressure cement injection joint, 10, cement injection hole, 11, cement supplement cavity ring, 12, cooling water injection hole, 13, interior annular water course, 14, radial water course, 15, outer annular cooling water course, 16, elasticity jump ring.

Detailed Description

The grease injection diameter-adjustable piston assembly is composed of a mud pump pull rod 2, a piston iron core 3, a locking nut 4, a nylon support ring 5, a piston rubber 6, a rubber compression ring 7, a water injection quick connector 8 and a high-pressure rubber injection connector 9, wherein the piston iron core 3 is arranged at one end of the mud pump pull rod 2, the piston iron core 3 is fastened through the locking nut 4, the piston iron core 3 is of a stepped cylinder structure, the piston rubber 6 is arranged at the small-diameter end of the piston iron core 3, the nylon support ring 5 is arranged at the bottom of the piston rubber 6, the rubber compression ring 7 is arranged at the front edge of the piston rubber 6, and the rubber compression ring 7 is clamped through an elastic clamp spring 16; the joint surface of the piston rubber 6 and the inner wall of the slurry pump cylinder sleeve 1 is an oblique conical surface, and the axial section of the piston rubber is horn-shaped. A cooling water injection hole 12 is formed in one side of a through hole in the large-diameter end of the piston iron core 3, a water injection quick connector 8 is installed at the outer end of the cooling water injection hole 12, the inner end of the cooling water injection hole 12 is communicated with an inner annular water channel 13, radial water channels 14 are uniformly distributed on the inner annular water channel 13, and the radial water channels 14 are communicated with an outer annular cooling water channel 15; the through-hole opposite side preparation of the big diameter end of piston core 3 has the daub filling hole 10, and the outer end in daub filling hole 10 is equipped with high-pressure daub and is annotated the joint 9, and the inside end intercommunication of daub filling hole 10 is the daub on the piston rubber 6 and is supplyed hollow ring 11. The cross-sectional shape of the cement supplementary hollow ring 11 is a circular hole shape or a trapezoidal hole shape, and the cement injection hole 10 is of a horizontal hole structure when being connected with the cement supplementary hollow ring 11 with the cross-sectional shape of a circular hole, and is of an inclined hole structure when being connected with the cement supplementary hollow ring 11 with the cross-sectional shape of a trapezoidal hole (see fig. 1-3).

The working process of the grease injection diameter-adjustable piston assembly is as follows:

when the outer edge of the piston rubber 6 is reduced by the abrasion size or the diameter of the mud pump cylinder sleeve 1 is ground to be large to cause mud leakage, firstly, stopping the mud pump; secondly, rotating a piston disc of the slurry pump to a rear dead center; thirdly, a high-pressure grease injection gun is installed at the bottom of the piston iron core 3, a certain amount of inert grease or high-pressure cement is injected into a cement injection hole 10 through a high-pressure cement injection joint 9, the inert grease or the high-pressure cement enters a cement supplement hollow ring 11, pressure is transmitted to the piston rubber 6, the piston rubber 6 is limited by the piston iron core 3 and a rubber compression ring 7, the piston rubber 6 is forced to deform and extrude in the radial direction, the diameter of a sealing rubber cup at the front part of the piston rubber 6 is slightly larger than the inner diameter of the mud pump cylinder sleeve 1, a shovel scrapes and extrudes mud to generate high pressure work when the piston rubber 6 moves forwards, and the front part of the iron core is sealed when the piston rubber 6 moves backwards, so that a gap formed by abrasion of the piston rubber 6 or the cylinder sleeve 1 is filled, and the aim of. Meanwhile, when the piston assembly is used, cooling water or lubricating and cleaning liquid is filled into the piston assembly through the water injection quick connector 8 and the cooling water injection hole 12, so that the piston assembly is lubricated and cooled immediately, residues generated on the inner wall of the cylinder sleeve and the outer edge of the piston leather cup are cleaned, the heat accumulated by movement under a well temperature and high pressure state is prevented from thermally dissolving the sealing leather cup, and the service lives of the mud pump cylinder sleeve 1 and the piston rubber 6 are prolonged greatly.

The grease injection diameter-adjustable piston assembly can realize resealing effect through multiple diameter changes, and the sealing effect of the piston cup in use is ensured; the outer annular cooling water channel 15 can forcibly inject water to clean, lubricate and cool the gap between the piston rubber 6 and the mud pump cylinder sleeve 1 at any time, thereby improving the abrasion resistance of the outer edge of the piston rubber 6 and the mud pump cylinder sleeve 1 and prolonging the service life of a sealing matching piece.

While the foregoing is directed to embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.