Anti-eccentric-wear fracturing pump fluid end

Abstract

A fracturing pump fluid end capable of preventing eccentric wear relates to the technical field of fracturing pumps, a spiral blade is welded on a right plunger, a step frame and a fan-shaped hole are arranged on one side face of the spiral blade, a rubber plate covers the fan-shaped hole, one side of the rubber plate is adhered to the step frame, a permanent magnet ring is embedded on the outer circle of the right plunger, and a permanent magnet tile is embedded in an inner hole of a gland. The excircle magnetic poles of the permanent magnet rings are the same as the magnetic poles of the inner holes of the permanent magnet tiles. The plunger pump has the beneficial effects that the spiral blade capable of being opened and closed in a one-way mode is arranged on the right plunger, so that the right plunger continuously rotates during reciprocating operation, the right plunger is evenly abraded in the circumferential direction, the service life of the right plunger is prolonged, the equipment maintenance cost is reduced, the magnetic force of the permanent magnet ring and the magnetic force of the permanent magnet tile repel each other, and the service life is prolonged. Equivalently, the permanent magnet tile lifts the right plunger at the lower part to eliminate the gravity influence, so that the eccentric wear phenomenon of the packing is reduced or eliminated, the service life of the packing is prolonged, and the replacement period of the packing is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of fracturing pumps, and in particular to a hydraulic end of a fracturing pump capable of preventing eccentric wear. Background Art

[0002] During oil fracturing operations, the fracturing pump is the key core equipment. The hydraulic end of the fracturing pump mostly adopts a reciprocating horizontal multi-cylinder plunger pump, that is, the plunger reciprocates horizontally in the pump body to change the volume in the pump body, and the liquid is sucked in or pumped out through the one-way valves at the inlet and outlet of the pump body. A packing seal is used between the plunger and the pump body. Due to the downward gravity of the plunger, when the plunger reciprocates, under the action of gravity, the cylindrical lower end of the plunger needs to be re-welded after wear, and the packing at the bottom of the plunger has eccentric wear, which reduces the service life and replacement cycle of the packing, increases the maintenance cost of the equipment, and affects the operation efficiency. Summary of the invention

[0003] In order to solve the problems of short service life and eccentric wear of the current fracturing pump plunger seal, the present invention provides an anti-eccentric wear hydraulic end of a fracturing pump.

[0004] The technical solution provided by the present invention is: a hydraulic end of a fracturing pump with eccentric wear prevention, comprising a pump body and a plunger, wherein the plunger is divided into a right plunger and a left plunger, the right plunger is connected to the pump body through a packing seal, a gland is connected to the pump body through bolts, the gland is pressed on the outside of the packing, the inner hole of the gland is connected to the right plunger through a clearance fit, and the left plunger is connected to the power end; The right side of the left plunger is fixedly connected to a support sleeve, a step hole is machined inside the support sleeve, a tapered roller bearing is installed in the step hole, the step hole is connected with the outer circle of the tapered roller bearing by clearance fit, the right side of the support sleeve is connected with a limit cover by bolts, the limit cover and the step hole limit the outer ring of the tapered roller bearing, the left side of the right plunger is machined with a step shaft, the step shaft is connected with the inner hole of the tapered roller bearing by transition fit, the left side of the step shaft is connected with a baffle plate by bolts, the baffle plate and the shaft shoulder of the step shaft limit the inner ring of the tapered roller bearing; A spiral blade is welded on the right plunger. The spiral blades are evenly arranged around the circumference and two adjacent spiral blades do not overlap in the axial direction. A step frame is provided on one side of the spiral blade, and a through fan-shaped hole is provided on the inner side of the step frame. A rubber plate is installed in the step frame on the spiral blade, and the rubber plate covers the fan-shaped hole. One side of the rubber plate is bonded to the step frame.

[0005] A permanent magnet ring is inlaid on the outer circle of the right plunger, and the outer circle of the permanent magnet ring is consistent with the size of the right plunger. The inner hole of the pressure cover is inlaid with a permanent magnet tile. The permanent magnet tile is an arc sheet structure, and the inner hole of the permanent magnet tile is consistent with the inner hole of the pressure cover. During installation, the permanent magnet tile is located at the bottom position, and the permanent magnet ring corresponds to the position of the permanent magnet tile in the left and right directions. The outer circle magnetic pole of the permanent magnet ring is the same as the magnetic pole of the inner hole of the permanent magnet tile.

[0006] The beneficial effects of the present invention are as follows: by arranging a unidirectionally openable spiral blade on the right plunger, the right plunger rotates continuously during reciprocating operation, the right plunger wears evenly in the circumferential direction, the service life of the right plunger is increased, and the equipment maintenance cost is reduced; the magnetic forces of the permanent magnet ring and the permanent magnet tiles repel each other, which is equivalent to the permanent magnet tiles lifting the right plunger at the bottom to eliminate the influence of gravity, thereby reducing or eliminating the occurrence of eccentric wear of the packing, thereby increasing the service life of the packing and extending the replacement cycle of the packing. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Attached Figure 1 It is a schematic diagram of the structure of the present invention; Attached Figure 2 is a front view of the front plunger of the present invention; Attached Figure 3 Yes Figure 2 AA section view; Attached Figure 4 It is a schematic diagram of the structure of the gland in the present invention; Attached Figure 5 It is a structural schematic diagram of the support sleeve in the present invention.

[0008] In the figure, 1-pump body, 2-right plunger, 3-left plunger, 4-support sleeve, 41-step hole, 5-limit cover, 6-baffle, 7-step shaft, 8-tapered roller bearing, 9-spiral blade, 91-sector hole, 92-step frame, 93-rubber plate, 10-pressure cover, 11-packing, 12-permanent magnet ring, 13-permanent magnet tile. DETAILED DESCRIPTION

[0009] like Figures 1 to 5 As shown, a hydraulic end of a fracturing pump with an anti-eccentric wear function comprises a pump body 1 and a plunger, wherein the plunger is divided into a right plunger 2 and a left plunger 3, wherein the right plunger 2 is sealed and connected to the pump body 1 through a packing 11, a gland 10 is connected to the pump body 1 through bolts, the gland 10 is pressed on the outside of the packing 11, the inner hole of the gland 10 is connected with the right plunger 2 through a clearance fit, and the left plunger 3 is connected to the power end; The right side of the left plunger 3 is fixedly connected to the support sleeve 4, a step hole 41 is processed in the support sleeve 4, a tapered roller bearing 8 is installed in the step hole 41, the step hole 41 is connected with the outer circle of the tapered roller bearing 8 by clearance fit, the right side of the support sleeve 4 is connected with a limit cover 5 by bolts, the limit cover 5 and the step hole 41 limit the outer ring of the tapered roller bearing 8, the left side of the right plunger 2 is processed with a step shaft 7, the step shaft 7 is connected with the inner hole of the tapered roller bearing 8 by transition fit, the left side of the step shaft 7 is connected with a baffle plate 6 by bolts, the baffle plate 6 and the shaft shoulder of the step shaft 7 limit the inner ring of the tapered roller bearing 8, that is, the left plunger 3 and the right plunger 3 can rotate with each other and are axially limited. A spiral blade 9 is welded on the right plunger 2. The spiral blades 9 are evenly arranged around the circumference and two adjacent spiral blades 9 do not overlap in the axial direction. A step frame 92 is provided on one side of the spiral blade 9. A through fan-shaped hole 91 is provided on the inner side of the step frame 92. A rubber plate 93 is installed in the step frame 92 of the spiral blade 9. The rubber plate 93 covers the fan-shaped hole 91. One side of the rubber plate 93 is bonded to the step frame 92. When wind blows from one side of the rubber plate 93 to one side of the fan-shaped hole 91, the rubber plate 93 is tightly attached to the step frame 92. When wind blows from the direction of the fan-shaped hole 91, the rubber plate 93 is pressed against the step frame 92. One side of the rubber sheet 93 will be blown away from the step frame 92 by the wind. Such a structure enables the spiral blade 9 to realize the function of acting in one direction. For example, when the right plunger 2 moves horizontally to the right, the rubber sheet 93 is attached to the step frame 92, and the spiral blade 9 can make the right plunger 2 rotate by an angle under the air resistance. When the right plunger 2 moves to the left, the rubber sheet 93 is blown away from the step frame 92 by the air, eliminating or reducing the resistance of the spiral blade 9, and the right plunger 2 does not rotate or rotates at a very small angle. This structure can make the right plunger 2 rotate slightly continuously during the reciprocating motion, avoiding the phenomenon of eccentric wear of the right plunger 2. By arranging the spiral blade 9 which can be opened and closed in one direction on the right plunger 2, the right plunger 2 can rotate continuously during reciprocating operation, and the right plunger 2 can be evenly worn in the circumferential direction, thereby increasing the service life of the right plunger 2 and reducing the equipment maintenance cost.

[0010] A permanent magnet ring 12 is inlaid on the outer circle of the right plunger 2, and the outer circle of the permanent magnet ring 12 is consistent with the size of the right plunger 2. The inner hole of the pressure cover 10 is inlaid with a permanent magnet tile 13, and the permanent magnet tile 13 is a circular arc sheet structure. The inner hole of the permanent magnet tile 13 is consistent with the inner hole of the pressure cover 10. During installation, the permanent magnet tile 13 is located at the bottom position, and the permanent magnet ring 12 corresponds to the position of the permanent magnet tile 13 in the left and right directions. The outer circle magnetic pole of the permanent magnet ring 12 is the same as the magnetic pole of the inner hole of the permanent magnet tile 13. The magnetic force of the permanent magnet ring 12 and the permanent magnet tile 13 repel each other, which is equivalent to the permanent magnet tile 13 lifting the right plunger 2 at the bottom to eliminate the influence of gravity, thereby reducing or eliminating the occurrence of eccentric wear of the packing 11, thereby improving the service life of the packing 11 and extending the replacement cycle of the packing 11.

Claims

1. A hydraulic end of a fracturing pump for preventing eccentric wear, comprising a pump body (1) and a plunger 2, characterized in that: The plunger is divided into a right plunger (2) and a left plunger (3). The right plunger (2) is sealed and connected to the pump body (1) via a packing (11). A gland (10) is connected to the pump body (1) via bolts. The gland (10) is pressed on the outside of the packing 11. The inner hole of the gland (10) is connected to the right plunger (2) with a clearance fit. The left plunger (3) is connected to the power end. The right side of the left plunger (3) is fixedly connected to a support sleeve (4), a stepped hole (41) is machined inside the support sleeve (4), a tapered roller bearing (8) is installed inside the stepped hole (41), the stepped hole (41) is connected to the outer circle of the tapered roller bearing (8) by clearance fit, the right side of the support sleeve (4) is connected to a limit cover (5) by bolts, the limit cover (5) and the stepped hole (41) limit the outer ring of the tapered roller bearing (8), the left side of the right plunger (2) is machined to a stepped shaft (7), the stepped shaft (7) is connected to the inner hole of the tapered roller bearing (8) by transition fit, the left side of the stepped shaft (7) is connected to a baffle (6) by bolts, the baffle (6) and the step shaft (7) The inner ring of the tapered roller bearing (8) is limited by the shaft shoulders; A spiral blade (9) is welded on the right plunger (2). The spiral blades (9) are evenly arranged on the circumference and two adjacent spiral blades (9) do not overlap in the axial direction. A step frame (92) is provided on one side of the spiral blade (9). A through fan-shaped hole (91) is provided on the inner side of the step frame (92). A rubber plate (93) is installed in the step frame (92) of the spiral blade (9). The rubber plate (93) covers the fan-shaped hole (91). One side of the rubber plate (93) is bonded to the step frame (92).

2. The anti-eccentric wear hydraulic end of a fracturing pump according to claim 1, characterized in that: The right plunger (2) is inlaid with a section of permanent magnet ring (12) on its outer circle, the outer circle of the permanent magnet ring (12) is consistent in size with the right plunger (2), the inner hole of the pressure cover (10) is inlaid with a permanent magnet tile (13), the permanent magnet tile (13) is a circular arc sheet structure, the inner hole of the permanent magnet tile (13) is consistent in size with the inner hole of the pressure cover (10), when installed, the permanent magnet tile (13) is located at the bottom position, the permanent magnet ring (12) corresponds to the position of the permanent magnet tile (13) in the left and right directions, and the outer circle magnetic pole of the permanent magnet ring (12) is the same as the magnetic pole of the inner hole of the permanent magnet tile (13).

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