CN200961590Y - Self-balanced sealing means of sand pump - Google Patents

Abstract

The utility model discloses a sand pump self-balance sealing device, comprising a pump shaft, a locating bolt, a locating base, a spring, an eccentric block, a connection plate, a connection pin, a guide pin, a sliding sleeve, a mechanical seal assembly, a connection bolt and a sealing ring; wherein the locating base is a ring sleeve and fixed on the pump shaft through the locating bolt, the connection plate is welded on the locating base, and the connection plate and the eccentric block are connected through the connection pin; the eccentric block is a columnar body with the step, the spring is connected between the upper end of the eccentric block and the locating base, and a spherical surface on the lower end of the eccentric block is contacted with the left end of the sliding sleeve; the sliding sleeve is a ladder-shaped shaft sleeve and sleeved on the pump shaft, the inner ring is provided with a key groove, and the guide pin is arranged inside the key groove; and a mechanical seal spring of the mechanical seal assembly is connected with the sliding sleeve, a static ring base is fixed on the pump body through the connection bolt, and the contact surface of the static ring base and the pump body is equipped with the sealing ring, which can decrease the end-face specific pressure of the mechanical seal, lighten the abrasion of the sealing end-face, prolong the operating life of the mechanical seal components, and guarantee the normal operation of the sand pump, under the situation of ensuing sealing the drilling mud.

Description

Sand pump self balancing seal arrangement

Technical field: the utility model relates to a kind of sand pump self balancing seal arrangement, belongs to oil drilling solid control equipment technical field, particularly relates to the seal arrangement on a kind of oil drilling sand pump.

Background technique: the seal arrangement of existing oil drilling sand pump adopts packing_seal, mechanical seal or the two combination sealing arrangement that combines.Packing_seal exists unreliable, the easy leakage of sealing, the short shortcoming that needs frequent replacing of life-span, the sealing reliability of mechanical seal is higher relatively, but because the sand pump conveying is the mud that contains the abrasiveness sand grains, and the temperature and pressure of mud is all higher, therefore the dynamic and static ring face pressure of required mechanical seal is higher, so just aggravate the wearing and tearing of seal face, shortened the life-span of mechanical seal, thereby caused the minimizing in the working life of sand pump.

Summary of the invention: the purpose of this utility model is higher in order to overcome in the prior art the dynamic and static ring face pressure of mechanical seal, serious wear, the defective that life-span is short designs a kind of sand pump self balancing seal arrangement of dynamic and static ring face pressure of adjustable mechanical sealing.

The utility model is made up of pump shaft, positioning screwn, positioning seat, spring, centrifugal, connecting plate, connecting pin, guide finger, flip sleeve, mechanical seal assembly, connecting bolt, seal ring, positioning seat is an annular cover, have pin-and-hole on it, and be fixed on the pump shaft by positioning screwn, on positioning seat, be welded with connecting plate, be drilled with pin-and-hole on the connecting plate, connecting plate is connected by connecting pin with centrifugal; Centrifugal is connected with spring for the Cylindrical object of step is arranged between its upper end and the positioning seat, and the lower end sphere contacts with the left side of flip sleeve; Flip sleeve is a stair-stepping axle sleeve, is enclosed within on the pump shaft, and inner ring has a keyway, is provided with guide finger in the keyway; The mechanical seal spring of mechanical seal assembly is connected with flip sleeve, and its stationary seat is fixed on the pump housing by connecting bolt, on the surface of contact of the stationary seat and the pump housing seal ring is installed.

The beneficial effects of the utility model are under the situation that guarantees the sealing drilling mud, reduce the face pressure of mechanical seal, the wearing and tearing that alleviate seal face, the working life of prolonged mechanical Sealing, the normal operation of the sand pump of assurance.

Description of drawings: accompanying drawing 1 is the utility model structural representation

Among the figure: 1-pump shaft, 2-positioning screwn, 3-positioning seat, 4-spring, centrifugal of 5-, 6-connecting plate, 7-connecting pin, 8-guide finger, 9-flip sleeve, 10-mechanical seal spring, 11-seal ring, 12-rotating ring, 13-connecting bolt, 14-stationary seat, 15-stationary ring, 16-seal ring, 17-seal ring, the 18-pump housing, 19-stop pin.

Embodiment: as can be known by accompanying drawing 1, the utility model is by pump shaft 1, positioning screwn 2, positioning seat 3, spring 4, centrifugal 5, connecting plate 6, connecting pin 7, guide finger 8, flip sleeve 9, mechanical seal spring 10, seal ring 11, rotating ring 12, connecting bolt 13, stationary seat 14, stationary ring 15, seal ring 16, seal ring 17, the pump housing 18 and stop pin 19 are formed, positioning seat 3 is annular covers, have pin-and-hole on it, and be fixed on pump shaft 1 by positioning screwn 2, be welded with connecting plate 6 on the positioning seat 3, be drilled with pin-and-hole on the connecting plate 6, connecting plate 6 is connected by connecting pin 7 with centrifugal 5; Be connected with spring 4 for the Cylindrical object of step is arranged between its upper end and the positioning seat 3 for centrifugal 5, the lower end sphere contacts with the left side of flip sleeve 9; Flip sleeve 9 is stair-stepping axle sleeves, and flip sleeve 9 is enclosed within on the pump shaft 1, and inner ring has a keyway, is provided with guide finger 8 in the keyway; The mechanical seal assembly is a standard piece, form by mechanical seal spring 10, seal ring 11, rotating ring 12, stationary seat 14, stationary ring 15, seal ring 17, stop pin 19, mechanical seal spring 10 is connected with flip sleeve 9, stationary seat 14 is fixed on the pump housing 18 by connecting bolt 13, on the surface of contact of the stationary seat 14 and the pump housing 18 seal ring 16 is installed.

When sand pump moves, pump shaft 1 begins rotation, guide finger 8 passes to flip sleeve 9 with the running torque of pump shaft 1, flip sleeve 9 is with pump shaft 1 rotation, because mechanical seal spring 10 and flip sleeve 9 and 12 of rotating rings have certain frictional force, flip sleeve 9 passes to rotating ring 12 by mechanical seal spring 10 with running torque, rotating ring 12 also has certain frictional force with seal ring 11 simultaneously, rotating ring 12 rotates with pump shaft 1 under the effect of frictional force, stationary ring 15 is transfixion under the effect of stop pin 19, simultaneously, centrifugal 5 under centrifugal action, overcome the pulling force of spring 4, with connecting pin 7 is that outwards rotate at the center, centrifugal 5 lower end sphere is moved to the left, flip sleeve 9 slides left under the thrust of mechanical seal spring 10, pulling force when spring 4, when this three of the thrust of centrifugal 5 centrifugal force and mechanical seal spring 10 reaches a balance, flip sleeve 9 slides no longer left and reaches a state of equilibrium, the decrement of mechanical seal spring 10 has reduced like this, the pressure that acts on rotating ring 12 and stationary ring 15 surface of contact reduces, thereby reduced the face pressure of sealing, the wearing and tearing that alleviated end face, thus prolong the working life of sealing; When sand pump is shut down, under the tension of spring 4, to regain inwards for centrifugal 5, centrifugal 5 sphere end promotes flip sleeve 9 compressed machinery Packing spring 10 to the right, and the specific pressure of sealing surface is increased, and prevents that mud from leaking.Therefore; sand pump self balancing seal arrangement can reduce face pressure when sand pump turns round; when shutting down, recovers by sand pump original bigger relatively face pressure; guaranteed to seal reliably under the two states drilling mud; the seal face specific pressure is big when having solved the sand pump running, heating value big, the problem of rapid wear; improved the working life of sealing effectively, thus the working life of having improved sand pump.

Claims (1)

1, a kind of sand pump self balancing seal arrangement, by pump shaft (1), positioning screwn (2), positioning seat (3), spring (4), centrifugal (5), connecting plate (6), connecting pin (7), guide finger (8), flip sleeve (9), the mechanical seal assembly, connecting bolt (13), seal ring (16) is formed, it is characterized in that positioning seat (3) is an annular cover, have pin-and-hole on it, be fixed on the pump shaft (1) by positioning screwn (2), on positioning seat (3), be welded with connecting plate (6), connecting plate is drilled with pin-and-hole on (6), and connecting plate (6) is connected by connecting pin (7) with centrifugal (5); Centrifugal (5) are connected with spring (4) for the Cylindrical object of step is arranged between its upper end and the positioning seat (3), and the lower end sphere contacts with the left side of flip sleeve (9); Flip sleeve (9) is a stair-stepping axle sleeve, is enclosed within on the pump shaft (1), and inner ring has a keyway, is provided with guide finger (8) in the keyway; The mechanical seal spring (10) of mechanical seal assembly is connected with flip sleeve (9), and its stationary seat (14) is fixed on the pump housing (18) by connecting bolt (13), on the surface of contact of the stationary seat (14) and the pump housing (18) seal ring (16) is installed.

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