CN2672325Y

CN2672325Y - Mechanical seal device in ground driven single screw pump speed reducer

Info

Publication number: CN2672325Y
Application number: CN 200320131271
Authority: CN
Inventors: 田澍藩
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-12-29
Filing date: 2003-12-29
Publication date: 2005-01-19
Anticipated expiration: 2013-12-29

Abstract

The utility model belongs to an oil field mechanical seal device in a ground driven single screw pump speed reducer. A mechanical seal stationary ring is arranged on the upper part of the hollow convex area of the lower cover of the speed reducer. A mechanical seal moving ring is arranged at the middle part of the upright shaft of the speed reducer. The mechanical seal stationary ring, the mechanical seal moving ring and the hollow position of the upright shaft form a lube pool. The hollow convex area of the lower cover of the speed reducer is provided with an air outlet channel and a leakage channel. The end of the air outlet channel is provided with a degassing or filling liquid valve. The upper part of the upright shaft is provided with a packing, which realizes the stationary seal of the upright shaft and a polished rod. The mechanical seal stationary ring and the hollow convex area of the lower cover are provided with a loading sheath. When the utility model is disassembled, only the packing of the upright shaft at upper part, the lock cap of the upright shaft, the upper part of the upright shaft and the lock cap of the mechanical seal are disassembled, and the mechanical seal stationary ring and the mechanical seal moving ring can be taken out simultaneously making use of the loading sheath. Because the mechanical seal can ensure the lubricating condition, the durability is prolonged. Adopting the appropriate material and combining with the stationary ring and the moving ring, the utility model can ensure the durability to be the same with the durability of the screw pump. Meanwhile, the mechanical seal is provided with the loading sheath, and the assembly and the disassembly are convenient.

Description

Mechanical seal device in the surface drive single screw pump speed reducer

(1) technical field: the utility model belongs to mechanical seal device in the surface drive single screw pump speed reducer of oil field.

(2) technical background: the surface drive of ground surface driving single screw pump is used mechanical seal instead for solving packing leakage of oil problem at present, and its strong point is that the sealing time is long, good energy-conserving effect.But can guarantee the same longevity of mechanical seal and subsurface progressive cavity, in case there are special circumstances to be easy to the new demand that disassembling, assembling and replacing is the user.

(3) summary of the invention: technical problem to be solved in the utility model is the working life of prolonged mechanical sealing, makes it to surpass the working life of subsurface progressive cavity, is beneficial to disassembling, assembling and replacing mechanical seal in special circumstances simultaneously.To this, the technological scheme that the utility model is taked is: the method in prolonged mechanical sealing working life on the basis of selecting suitable material and structure, will guarantee exactly that the mechanical seal friction pair is under the liquid lubrication condition to work.Utilize the Crude Oil Transportation condition, promptly utilize crude oil and water to make fluid lubricant, and select for use the mechanical seal of tungsten carbide material to satisfy under the normal back pressure condition of oil well and the requirement of underwell pump with the longevity.Since crude oil medium gassiness, and mechanical seal is in the well head upper position, if gas engaging friction pair in particular cases forms dry friction, also unavoidable early stage damage of good again material.Solution has two for this reason, and first is provided with lubricating oil bath, and second regularly fills out oiling agent to lubricating oil bath, guarantees that friction pair is in the liquid lubrication state all the time.For the ease of dismounting, utilize the big characteristics of speed reducer vertical shaft thrust-bearing, vertical shaft is made hollow type, and the speed reducer lower cover made the bigger hollow boss of rigidity, mechanical seal is contained in vertical shaft cavity and speed reducer lower cover hollow boss position, takes vertical shaft top apart and can extract combined mechanical sealing out.In speed reducer lower cover hollow boss inside the duct is set, the first pond upper gas of can regularly draining the oil makes well liquid fill oil sump under self pressure and guarantees lubricating condition; Second is provided with Leak hole, in case mechanical seal has this hole of fault that leaked liquid is arranged, does not pollute lubricant oil in the speed reducer, in time finds, is beneficial to maintenance.

(4) description of drawings: Fig. 1 is a structural representation of the present utility model.

(5) embodiment:, further set forth an optimal way of the present utility model below in conjunction with accompanying drawing.Referring to Fig. 1 as can be known, the utility model mechanical seal 3 stationary rings are loaded on hollow boss 1 top of speed reducer lower cover, and mechanical seal 3 rotating rings are loaded on speed reducer vertical shaft 2 middle parts, and mechanical seal 3 dynamic and static rings and vertical shaft 2 hollow parts form lubricating oil bath.Have venting duct 10 at speed reducer lower cover hollow boss 1 position and leak duct 9, venting is housed or fills out fluid valve 11, the static seal that packing 5 is realized vertical shaft 2 and polished rod 8 is housed on vertical shaft 2 tops at the venting nose end.Assembling cover 7 is housed on mechanical seal 3 stationary rings and lower cover hollow boss 1, and mechanical seal lock nut 6 will assemble the top that cover 7 is fixed on lower cover hollow boss 1, and vertical shaft lock nut 4 connects two ones up and down of vertical shaft 2, makes it to be fixed as one.During dismounting,, utilize assembling cover 7 can take out quiet, the rotating ring of mechanical seal 3 simultaneously as long as remove vertical shaft 2 top packings 5, vertical shaft lock nut 4, top vertical shaft, mechanical seal lock nut 6.Under the working condition, lubricating oil bath has liquid, and the operating time, long liquid had consumption, can regularly open valve 11 venting, the oil sump step-down, and crude oil (moisture, gas) is filled oil sump under delivery pressure.Note during venting emitting some crude oil, guarantee that the oil sump filling is full.

Claims

1, mechanical seal device in a kind of surface drive single screw pump speed reducer, it is characterized in that mechanical seal (3) stationary ring is loaded on hollow boss (1) top of speed reducer lower cover, mechanical seal (3) rotating ring is loaded on speed reducer vertical shaft (2) middle part, and dynamic and static ring of mechanical seal (3) and vertical shaft (2) hollow part form lubricating oil bath; Have venting duct (10) at speed reducer lower cover hollow boss (1) position and leak duct (9), venting is housed or fills out fluid valve (11) at the venting nose end; On vertical shaft (2) top packing (5) is housed, realizes the static seal of vertical shaft (2) and polished rod (8); Assembling cover (7) is housed on mechanical seal (3) stationary ring and lower cover hollow boss (1), mechanical seal lock nut (6) will assemble the top that cover (7) is fixed on lower cover hollow boss (1), vertical shaft lock nut (4) connect vertical shaft (2) up and down two ones make it to be fixed as one.