CN201412348Y

CN201412348Y - Sealing structure body on screw pump driving device

Info

Publication number: CN201412348Y
Application number: CN2009201537812U
Authority: CN
Inventors: 陈志国; 邵永实; 邓辉; 邹玉平
Original assignee: Daqing Oilfield Powerlift Pump Industry Co Ltd
Current assignee: Daqing Oilfield Powerlift Pump Industry Co Ltd
Priority date: 2009-05-12
Filing date: 2009-05-12
Publication date: 2010-02-24
Anticipated expiration: 2019-05-12

Abstract

The utility model discloses a sealing structure body on a screw pump driving device, which mainly solves the problems that the repair cost is high and main parts are not convenient to be replaced. Thesealing structure body is characterized in that the sealing structure body is positioned in a ring-shaped cavity of a hollow main shaft and a separation sleeve and includes a flow guide sleeve arranged on a shaft shoulder, a deep groove ball bearing is pressed on the flow guide sleeve and a sealing short sleeve and a sealing socket are respectively pressed on an inner ring and an outer ring of the deep groove ball bearing; a seal groove of an inner pore of the sealing socket is internally provided with a rotary sealing ring and contacts the outer cylindrical surface of the sealing short sleeve, and the sealing socket is tightly fixed with the hollow main shaft through a driving screw; while the sealing short sleeve is sheathed on the separation sleeve and forms radial location with the separation sleeve through a limit pin; and a circlip for shaft arranged on the upper end face of the sealing short sleeve is blocked in a jump ring groove of the separation sleeve. The sealing structurebody is simple, convenient for repair and low in cost.

Description

Seal structure on a kind of driving unit on screw pump

Technical field

The utility model relates to a kind of sealing configuration in the screw pump oil production field, oil field, specifically, relates to the seal structure on a kind of driving unit on screw pump.

Background technique

At present, domestic oil field screw pump unit surface drive all contains a cover polished rod seal system, it seals the produced liquid in oil well that the drive unit of flowing through enters the ground petroleum pipeline, prevents that it from leaking in the external environment condition, guarantees the surface drive proper functioning and prevents well liquid befouling environment.The sealing system of the screw pump surface drive of using has two kinds of structures now, and a kind of structure is the polished rod stuffing box sealing system, and another kind of structure is the seal shaft mechanical sealing system.In the polished rod stuffing box sealing system because the periodic vibration of polished rod, and the polished rod suface processing quality directly influences sealing effect, also can cause a large amount of mechanical losss in denuding with the Long contact time of polished rod, the disconnected fault of taking off also takes place in polished rod easily, increases cost of production because of changing polished rod.In the seal shaft mechanical sealing system since system in running, can there be certain gas in the chamber, the use premature failure that makes mechanical seal, and the requirement of the installation precision of mechanical seal is very high, when repair and replacement to operator's technical requirements than higher, repair and replacement inconvenience.

The model utility content

The technical problems to be solved in the utility model provides the seal structure on a kind of driving unit on screw pump, this seal structure adopts a kind of structure that cooperates with the short cover of rotary seal ring and sealing, be installed in the hollow spindle inside of surface drive upper end, only need change the short cover of sealing in the structure during maintenance, can reduce production costs, maintenance is simple again, convenient.

The technical solution of the utility model is: the seal structure on a kind of driving unit on screw pump, comprise the speed reducer hollow spindle and run through the interior separation sleeve of hollow spindle, form toroidal cavity between the two, on this cavity lower hollow main shaft inwall the shaft shoulder is arranged, described seal structure places in this toroidal cavity, comprise the water conservancy diversion cover that places on the shaft shoulder, and water conservancy diversion puts and compresses deep groove ball bearing, compress short cover of sealing and sealing seat on the Internal and external cycle of deep groove ball bearing respectively; The seal groove of sealing seat endoporus is built-in with rotary seal ring and contacts with the outer cylinder of the short cover of sealing, and sealing seat is fastening by transmission screw and hollow spindle; Be sleeved on the separation sleeve and sealing is short, form radial location by position-limitting pin and separation sleeve; Place the short axle that puts end face of sealing to be stuck in the jump ring groove of separation sleeve with Sealing shield ring.

There is draw-in groove the upper end of described hollow spindle, and the upper support cover is installed in this draw-in groove, is rigidly connected by screw and hollow spindle; Sealing shield ring, seal ring and gland are anchored in the upper support cover from the bottom to top successively; Ceramic coated or the hard chromium plating of outer surface that the short cover of described sealing contacts with rotary seal ring.

The beneficial effects of the utility model are: owing to take such scheme, seal structure to be directly installed in the annular chamber between speed reducer hollow spindle and separation sleeve, the integral sealing physical dimension is less, seldom the occupying volume external space; Seal structure adopts short cover of suit sealing and sealing seat outside separation sleeve, rotary seal ring in the sealing seat is contacted with the short cover of sealing rub rather than with the direct contact friction of separation sleeve, the short cover of sealing can adopt the ceramic coated or chromed hardened mode of outer cylinder to strengthen the wear resistance on surface, improve the working life of sealing configuration, only need change the short cover of sealing in the structure during maintenance, easy to maintenance, convenient, with low cost.

Description of drawings

Accompanying drawing 1 is a structural representation of the present utility model.

The short cover of 1-water conservancy diversion cover 2-hollow spindle 3-sealing seat 4-transmission screw 5-sealing 6-circlip for shaft 7-Sealing shield ring 8-seal ring 9-gland 10-upper support cover among the figure, the 11-position-limitting pin 12-rotary seal ring 13-separation sleeve 14-deep groove ball bearing 15-shaft shoulder

Embodiment

The utility model is described in further detail below in conjunction with accompanying drawing:

By shown in Figure 1, seal structure on this driving unit on screw pump is at speed reducer hollow spindle 2 and run through in the toroidal cavity that forms between the separation sleeve 13 in the hollow spindle 2, on these cavity lower hollow main shaft 2 inwalls the shaft shoulder 15 is arranged, described seal structure lower end is positioned on this shaft shoulder 15; And seal structure mainly is made of upper support cover 10, sealing seat 3, rotary seal ring 12, the short cover 5 of sealing, deep groove ball bearing 14, position-limitting pin 11 and circlip for shaft 6, transmission screw 4 and water conservancy diversion cover 1; Described water conservancy diversion cover 1 places on the shaft shoulder 15 of hollow spindle 2 inwalls, successively compress deep groove ball bearing 14 thereafter, compress short cover 5 of sealing and sealing seat 3 on the Internal and external cycle of deep groove ball bearing 14, rotary seal ring 12 is installed in the seal groove of sealing seat 3 endoporus and is contacted with the outer cylinder of the short cover 5 of sealing, and sealing seat 3 is fastening by

transmission screw

4 and 2 of hollow spindles, follows hollow spindle 2 rotations; The short cover of the sealing 5 ceramic coated or hard chromium plating of outer surface that contact with rotary seal ring 12 strengthen the wear resistance on surface, improve the working life of sealing configuration; The short cover of sealing 5 inner hole sleeves are contained on the separation sleeve 13, form radial location by position-limitting pin 11 and separation sleeve 13; Place the circlip for shaft 6 of the short cover of sealing 5 upper-end surfaces to be stuck in the jump ring groove of separation sleeve 13, the short cover 5 of restriction sealing moves radially.There is draw-in groove the upper end of hollow spindle 2, upper support cover 10 is installed in this draw-in groove, be rigidly connected by screw and hollow spindle 2, Sealing shield ring 7, seal ring 8 and gland 9 are anchored on upper support from the bottom to top successively and overlap in 10 holes, 9 pairs of seal rings 8 of gland are exerted pressure, seal ring 8 is closely contacted with polished rod, form sealing, prevent that well liquid from overflowing along polished rod.

In practical work process, by square card connection, power has just passed to polished rod by the hollow spindle of speed reducer like this between screw pump polished rod and the upper support cover 10, and polished rod drives the suction that the subsurface progressive cavity running realizes well liquid.

Claims

1, the seal structure on a kind of driving unit on screw pump, comprise speed reducer hollow spindle (2) and run through the interior separation sleeve (13) of hollow spindle (2), form toroidal cavity between the two, on this cavity lower hollow main shaft (2) inwall the shaft shoulder (15) is arranged, it is characterized in that: described seal structure is positioned at this toroidal cavity, comprise and place the shaft shoulder (15) to go up water conservancy diversion cover (1), compress deep groove ball bearing (14) on the water conservancy diversion cover (1), compress the short cover of sealing (5) and sealing seat (3) on the Internal and external cycle of deep groove ball bearing (14) respectively; The seal groove of sealing seat (3) endoporus is built-in with rotary seal ring (12) and contacts with the outer cylinder of the short cover of sealing (5), and sealing seat (3) is fastening by transmission screw (4) and hollow spindle (2); And the short cover of sealing (5) is sleeved on the separation sleeve (13), forms radial location by position-limitting pin (11) and separation sleeve (13); Place the circlip for shaft (6) of the short cover of sealing (5) upper-end surface to be stuck in the jump ring groove of separation sleeve (13).

2, the seal structure on a kind of driving unit on screw pump according to claim 1, it is characterized in that: there is draw-in groove the upper end of hollow spindle (2), and upper support cover (10) is installed in this draw-in groove, is rigidly connected by screw and hollow spindle (2); Sealing shield ring (7), seal ring (8) and gland (9) are anchored in the upper support cover (10) from the bottom to top successively.

3, the seal structure on a kind of driving unit on screw pump according to claim 1 is characterized in that: the ceramic coated or hard chromium plating of outer surface that the short cover of sealing (5) contacts with rotary seal ring (12).