CN87202825U

CN87202825U - Isolated-bladdered piston or post stopper mechanism

Info

Publication number: CN87202825U
Application number: CN 87202825
Authority: CN
Inventors: 王庆强
Original assignee: Individual
Current assignee: Individual
Priority date: 1987-03-05
Filing date: 1987-03-05
Publication date: 1988-01-13

Abstract

An isolating bladder piston or embolismic fluid compression or expansion machinery. The machinery is characterized in that the inside of the cylinder is provided with a fluid isolating bladder, and liquid intermediate medium for lubrication is filled between the piston or plunger and the bladder. The utility model solves the complicated problems of leakage, fluid pollution and technical process in existing technique, and has the advantages of good lubricity, high purity of fluid, no leakage, low cost and high quality of products. The utility model can be used for the compression and expansion of oxygen, high-purity gases or gases with high humidity and high impurity as well as various liquid.

Description

Isolated-bladdered piston or post stopper mechanism

The utility model relates to a kind of piston or compression of plunger fluid or expansion machinery, and particularly a kind of have the lubricated volume type of intermediate medium to isolate capsule formula piston or compression of plunger fluid or expansion machinery.

Existing piston or compression of plunger fluid or expansion machinery, mainly formed by piston or plunger, cylinder, air inlet and exhaust valve, suction tude, outlet pipe and the reciprocating power plant of driven plunger, the working method of piston or plunger is divided into two kinds: (1), oil lubrication is arranged, promptly reduce its friction factor by the oil film that forms between piston ring and the casing wall; (2), oil-free lubrication, promptly with the coefficient of reducing friction of the piston ring of material with self-lubricating function, this piston ring is made with teflon, graphite or MOS etc., still, the former has leakage phenomenon: 1. oil enters in the fluid, fluid is contaminated.There is oil can cause the catalyst poisoning as nitrogen hydrogen mixeding gas class in the synthetic ammonia, must be provided with expensive complicated oil purification equipment.Some fluid, as oxygen, meeting oil can set off an explosion, so can not adopt oil lubrication.If the air compressor band oil that the moving instrument of air feed is used easily makes tiny instrumentation pipeline stop up, have a strong impact on sensitivity etc.2. working medium---escape of liquid reduces its productivity.Though the latter has avoided the shortcoming of fluid folder oil, and leakage problem is arranged too, and not wear-resisting.Gas as fluid is a high humidity, impurity is many can make very quick-wearing of piston ring, bonds, even scratches cylinder body, so for sordid gas, must take the filtration measure earlier or just can enter compressor through water separator earlier, makes technological process complicated.

The purpose of this utility model is to provide a kind of novel piston or compression of plunger type fluid or expansion machinery, not only has the advantage that oil lubrication is arranged, and has the benefit of oil-free lubrication, simultaneously, can guarantee fluid purity, improves the quality and productivity.It isolates capsule by increasing, and fluid is isolated from the outside, and reaches this purpose.

The utility model is realized as follows: this fluid compression or expansion machinery, except that having the reciprocating power plant of piston or plunger, cylinder, air inlet and exhaust valve, driven plunger or plunger, in cylinder, also has the isolation capsule that fluid is isolated with piston or plunger working portion, this fluid is liquid or gas, and the liquid intermediate medium of lubricate is arranged between piston or plunger and the capsule.This intermediate medium can also play the heat transfer medium effect, and it can transmit the interaction between piston or plunger and fluid according to Pascal's law.Above-mentioned isolation capsule can be made by the flexible material of impermeable, fluid-resistant and liquid intermediate medium burn into and the anti-folding of working at a certain temperature.As plastics such as available polypropylene, teflon or PET.Certain thickness can be arranged, also can be made into film.Skeleton can be arranged, make, also the form of fold formula or free pit etc. as concertina compression-expansion or bellows form.For satisfying need of work, also can require this material to have certain oxidative stability.Above-mentioned liquid intermediate medium can be an oil, also can be other nonspecific lubriation materials.Isolate capsule and can roughly be bowl-type, also ring-type, the cross section is a spill etc.This capsule can be located at the one side of piston piston-rodless, also can be located at the one side of piston rod, at this moment, liquid intermediate medium sealing configuration is arranged between capsule and piston rod, as axle sleeve type, or axle sleeve oiling ring structure, cover also can be fixed by support and cylinder.On casing wall, the valve plug that injects or change liquid intermediate medium of anti-certain pressure can be housed.Fixing or compressing solid and reliable for guarantee isolating capsule, around capsule, preferably having the protruding coil structures of being convenient to compress sealing.Its compressing structure can adopt the two-section cylinder to compress, and also available valve body that has an intake and exhaust valve and air inlet-outlet pipe flange and cylinder body flange are fixed and clamped etc.Can be that piston simultaneously has single capsule formula of isolating capsule, also can be that the piston two sides all has two capsule formulas of isolating capsule, and all can there be the air inlet and exhaust valve door on both sides.

Compare with oil lubrication is arranged, the utility model does not have leakage phenomenon, and fluid is pollution-free, and the purity height improves the quality and output, and has saved oil purification equipment, and high lubricating effect is saved lubricant oil, and cost is low.The compression-expansion that can be used for multiple gases such as oxygen.Compare with oil-free lubrication, have the advantage of not leaking equally, lubricity is good, and is wear-resisting, do not produce bonding and draws phenomenons such as scarce, and type of fluid is unrestricted, can process high-purity gas and high humidity, impurity gas how etc., improves the quality and output.

Below in conjunction with accompanying drawing concrete structure of the present utility model is described in detail.

Fig. 1 is the utility model oxygen compressor suction condition structural representation.

Fig. 2 is its exhaust condition structural representation.

Referring to Fig. 1, (5) be cylinder body, (2) be piston, (1) is piston rod, (4) be guide ring, (3) are seal oil rings, and (7) are that polytetrafluoroethylene film is isolated capsule, (6) be lubricant oil, (8) be valve seat, (11) are valve gaps, and (9) are valve plates, (10) be spring, (8) air inlet and exhaust valve is formed in (11) (9) (10), and is fastening by bolt (13), by suction tude (14), flange plate on the outlet pipe (12) and the flange plate on the cylinder body are with air inlet and exhaust valve and isolate the capsule sealing that is fixed and clamped, power plant can be with the motor of internal-combustion engine or band offset connecting rod structure, when piston rod is driven to-and-fro motion, isolates capsule and make opening and closing movement, the air inlet and exhaust valve intake and exhaust, under fluid and the extraneous condition that is isolated, make oxygen compression or expansion.Be the more anti-fold of capsule root, cylinder has arc transition with isolation capsule contacting point.

Claims

1, a kind of fluid compression or expansion machinery with piston or plunger, cylinder, air inlet and exhaust valve, power plant is characterized in that having the fluid isolation capsule in the cylinder, and the liquid intermediate medium of lubricate is arranged between piston or plunger and the capsule.

2, fluid compression as claimed in claim 1 or expansion machinery is characterized in that around the said isolation capsule the protruding coil structures of being convenient to compress sealing being arranged.

3, fluid compression as claimed in claim 1 or 2 or expansion machinery is characterized in that there is garden arc transition said cylinder and isolation capsule contacting point.