CN2059685U

CN2059685U - Wear-resistant single-action piston for drill pump

Info

Publication number: CN2059685U
Application number: CN 90200174
Authority: CN
Inventors: 侯守信
Original assignee: Langfang Sub-Inst Petroleum Exploration & Development Inst
Current assignee: Langfang Sub-Inst Petroleum Exploration & Development Inst
Priority date: 1990-01-10
Filing date: 1990-01-10
Publication date: 1990-07-25

Abstract

The utility model provides a wear-resistant single-action piston for a drill pump. The wear-resistant single-action piston for a drill pump is characterized in that the back of the wear-resistant single-action piston for a drill pump is provided with a sealing pad with bidirectional lip openings. A wear-resistant material is sulfured on the working surface of the rubber bowl of a main piston. The outer surface of a piston core is provided with an annular wear reducing lubricant groove. The seal of the wear-resistant single-action piston for a drill pump with the structure is reliable.

Description

Wear-resistant single-action piston for drill pump

The utility model relates to the used combined type single action piston of drilling pump.

In the oil drilling engineering, the used piston of drilling pump is well-known easily damaged parts.The height of piston life directly influences the normal operation and the bit speed of drilling pump, therefore improves piston life and is paid attention to by people always.Usually the approach of the raising piston life that adopts mainly contains: improve rubber seal back serious stress state, the pistons work stressed comparison in surface is evenly improved the life-span; Or strengthen piston cup back hardness, thereby improve friction surface stress and improve the life-span; Or adopt and to cool, reduce the pistons work surface temperature and improve life-span or the like.For a long time, technos has carried out big quantity research and improvement to piston, but because the restriction and the limitation of various factors, still there is such-and-such problem to some extent in using at the scene, eccentric wear one class heel and toe wear for example, the sealability instability, piston mounting or dismounting difficulty, the disposable use of Metal fittings is scrapped etc.The piston pattern of China's extensive use is still SY5138--86 ancestral petroleum ministerial standard at present, and its life-span only is 100--200 hour even lower.

Chinese patent 86208786.4 is to have solved the piston stress in recent years preferably and installed and removed an example easy to use.But the under low pressure self-styled ability of the piston that it provides is relatively poor, after wearing and tearing after a while, the working solution leakage occurs under low pressure and termination of pumping state.This piston has also comprised the spray cooling system of an inseparable complexity in addition, and piston rod O-ring seals operating life in tempering property of high pressure medium that this system adopts is lower, thereby influences the overall work life-span of piston; It makes piston structure become complicated simultaneously, and cost of production increases, so its practicability greatly reduces.In view of above problem, in fact this patent is difficult to promote the use of at mining site.

For sealing reliability, wear resistance, practicability and the versatility that improves piston, the waste of avoiding non-easy worn part to scrap causing improves the whole service life of piston, and the utility model provides a kind of wear-resisting combined type single action piston.

The utility model has been cancelled complicated spray cooling system and has been utilized conventional cooling unit, and changing piston back one-way sealing is two way sealed; Change piston cup into composite structure, promptly applied one deck filled polytetrafluoroethylene material and replaced former rubber working surface as wear-resistant material layer at pistons work surface sulphur; On the outer surface of piston core, drive a stepped circular groove, be used for depositing the antifriction oiling agent and deposit sand.The piston of this structure has been realized the purpose that sealing is reliable, wear resistance is good, easy to use, is more than doubled than life-span of existing piston.

Further specify below in conjunction with accompanying drawing.Accompanying drawing is the structural representation of drilling pump single action piston.This piston mainly is made up of piston core 1, spacer ring 2, piston cup 3, disc type pressing plate 4.The sealing gasket 7 of a two-way lip is housed on the shoulder at piston back, and available hardness is that the nitrile butadiene rubber of Hs75--80 is made, and relies on pressing plate 8 and fixing bolt 9 to be fixed with piston core 1 and fuses.The working surface sulphur of piston cup 3 has applied the wearing layer 5 of one deck 2--3 millimeters thick, and can adopt the activated carbon fiber teflon is material, with sticking technology this high-abrasive material and rubber is combined into firm inseparable solid piston leather cup 3 in original mould.On the outer surface of piston core 1, have wide about 3 millimeters deep about 2.5 millimeters with 0.3 millimeter stepped circular groove 6 that links to each other of wide about 3 millimeters deep, be used for depositing the antifriction oiling agent and work the sand effect of depositing.

Effect of the present utility model is: the first, because the interference of former main piston leather cup is less, self-styled ability is relatively poor under low-pressure state, after increase has the sealing gasket of two-way lip, not only has and main piston leather cup sealability in the same way, and has the back seal ability.Thereby under low pressure and termination of pumping state, both can prevent the air inlet of piston back or advance spray liquid, also can after the main piston wearing and tearing, play the effect that stops piston to leak mud, so both brought into play the convenient and strength-saving advantage of the little mounting or dismounting of main piston leather cup interference, remedy the weakness of its sealability deficiency again, thereby improved the whole service life of piston.Second, owing to increased the lower wear-resistant material layer of one deck friction factor on the main piston leather cup working surface, greatly reduce the frictional force between piston and the cylinder sleeve, and this material has very strong adaptive capacity to sand grains, sand grains is embedded in the top layer, thereby slowed down the tempering property wearing and tearing between piston and cylinder sleeve; Adding has the antifriction oiling agent to play lubrication antifriction function in the circular groove, and circular groove also plays and deposit the sand effect, makes the operating mode of whole piston make moderate progress, and has improved the operating life of piston.The 3rd, owing to cancelled spray equipment the piston overall structure is oversimplified, modularity, sealing reliability and the versatility of piston have been strengthened, made things convenient for on-the-spot mounting or dismounting to use, avoided unnecessary waste of material, improved the practicability of piston greatly, the effect that having obtained reduces cost increases economic efficiency.

Claims

1, a kind of drilling pump is with wear-resisting single action piston, mainly form by piston core 1, spacer ring 2, piston cup 3, disc type pressing plate 4, it is characterized in that, sealing gasket 7 with two way sealed lip is housed on the shoulder at piston back, the working surface sulphur of piston cup 3 has applied one deck filled polytetrafluoroethylene material and has replaced former rubber working surface as wearing layer 5, has a stepped circular groove 6 on the surface, outer garden of piston core 1.