CN205937034U - Novel piston motion guide ring for non -lubricated compressor - Google Patents

Abstract

The utility model relates to a piston compressor field especially relates to an installation and dismantles convenient novel piston motion guide ring for non -lubricated compressor, including the guide ring that embolias the corresponding annular of piston body, a slant opening has been seted up on the guide ring, slant open -ended acute angle is at 45~60 within ranges. It leads to the groove to be provided with a plurality of axials on the guide ring excircle. The cross -section that the groove is led to to the axial is triangle -shaped or crescent. The excircle department design that the guide ring corresponds the high -pressure gas direction has a taper surface, and the tapering is 10~30 degrees. The utility model discloses an overcome the whole hot jacket formula that exists among the prior art and split type goods improve for the shortcoming of compressor provide that an installation is convenient, reliable operation and long service life's comprehensive properties's novel piston motion guide ring for non -lubricated compressor.

Description

A kind of new non-lubricated compressor piston movement guide ring

Technical field

The utility model is related to piston compressor field, and more particularly, to a kind of installation and removal are easily new unlubricated Piston for compressor motion guide ring.

Background technology

Guide ring is a common part used in piston compressor（Fig. 1）, usual material is nonmetallic（General employing Filled polytetrafluoroethylene, nylon etc.）, its effect is to control piston gap and cylinder wall between in motion process, thus protecting Card piston axis and the axiality of cylinder-bore axis, prevent piston at the volley because excessive slew causes piston directly to rub with cylinder wall Wipe, lead to cylinder wall to be pulled, cause compressed medium to reveal.The preferable operating position of guide ring is that guide ring inner headed face is close to ring Groove bottom, as far as possible little to the resistance of gas leakage, it is subjected only to frictional force.

In piston compressor, conventional guiding annular type is overall thermal sleeve and two kinds of split-type.Overall thermal sleeve work Have good positioning, but installation process needs special hot jacket instrument, simultaneously need to a large-scale heating furnace ensures guide ring and hot jacket Instrument is heated simultaneously, makes ring thermal expansion, until ring expand into more than piston body external diameter, is inserted in the corresponding annular groove of piston body, by ring Inner circle and the interference fit of annular groove bottom surface, can be good at ensureing that ring inner circle is close to annular groove bottom surface, ring is solely subjected to and cylinder wall Frictional force, service life is longer, but installation process is complicated, and time-consuming, also when ring inner circle size justifies size mistake with annular groove bottom When the amount of being full of is larger, ring is easily caused to produce fracture.Split-type guide ring can be installed at normal temperatures, but after assembling with piston, with work Enter difficult in cylinder process, simultaneously because a point lobed formula leads to ring cannot be accurately positioned at work, be easily caused friction surface More larger than pressing, cause abrasion aggravation, the service life of ring is shorter, also can separately introduce locating element and ensure positioning, but increase simultaneously The number of consumable accessory, after coming off, equally can cause cylinder to scratch.

Content of the invention

The purpose of this utility model is to overcome overall thermal sleeve and split-type forwarder pressure present in above-mentioned prior art The shortcoming of contracting machine and improve a kind of new unlubricated pressure of the combination property that install convenient, reliable operation and long service life are provided Contracting machine piston movement guide ring.

The technical solution of the utility model is realized in：A kind of new non-lubricated compressor piston movement guides Ring, including the guide ring being inserted in the corresponding annular groove of piston body, described guide ring offers an inclined open, described inclined open Acute angle is in the range of 45 ° ~ 60 °.

It is provided with some axial pass troughs on described guide ring is cylindrical.

The section of described axial pass trough is triangle；Triangle groove section drift angle e is 45 ~ 60 degree, and groove must not simultaneously Less than piston body periphery.

The section of described axial pass trough is crescent；Crescent groove section arc radius R is 2.5 ~ 5mm, groove simultaneously Piston body periphery must not be less than.

In guide ring near the cylindrical place of compression chamber, it is designed with a taper surface, taper is 10 ~ 23 degree.

The good effect that the technical solution of the utility model produces is as follows：The guide ring of this design is overall structure, is leading The otch that one cross-sectional width is B is opened on ring.Due to use material hardness relatively low, elasticity larger, can manually Ring opens, and is then inserted in the corresponding annular groove of piston body.Pull down also is as the method it is not necessary to any instrument.Achieve installation and Dismantle simple, convenient purpose.

Self-align aspect at work, mainly by fit dimension（Fig. 2, Fig. 3）And differential pressure of atmospheric pressure effect realization（Fig. 4）.

The main impact considering ring thermal expansion at the working temperature in size.Guide ring inner circle diameter phi d and piston body Groove bottom diameter adopts interference fit, absorbs the thermal expansion amount of part guide ring inner circle by the magnitude of interference.Guide ring axial height K Require and between the annular groove of piston body during operating temperature must interference, inhaled using the frictional force between guide ring and piston body annular groove Receive another part swell increment of guide ring inner circle.Size furthermore with the gap width B of guide ring to accommodate ring in guide ring To thermal expansion amount it is ensured that guide ring breach two ends at the working temperature will not because contact produce contact stress, and avoid because Stress causes guide ring inner headed face to depart from piston body annular groove bottom surface, causes undesirable abrasion aggravation.Above aggregate measures can Ensure that guide ring inner headed face contacts with piston body groove bottom diameter face all the time.

In addition in terms of pressure reduction.The no matter hot and cold operating mode of guide ring excircle dimension φ D, remains less than cylinder wall diameter, Ensure that pressed gas pressure loss during by ring is less, pressure P2 ≈ P1 after ring, and ring is cylindrical averagely pressurized is（P1 +P2）/ 2, and（P1+P2）/ 2 ＞ P3, the direction of pressure reduction is directed to piston body axis, compressor operationally, in above pressure reduction The lower promotion guide ring of effect is inwardly tightened up.In addition in guide ring near the cylindrical place of compression chamber, it is designed with a taper surface, taper is 10 ~ 30 degree, when gases at high pressure pass through guide ring, give one centripetal component of guide ring, promote guide ring concentric contraction.Logical Cross the integrated application of above measure, can effectively realize guide ring and be automatically positioned on ideal operation position.Simultaneously in order to strong Change the effect of pressure reduction, more effectively reduce the pressure loss during gas passes through ring, in the substantial amounts of axle of guide ring Excircle machining To groove, reduce gas flow resistance it is ensured that enough pressure reduction.The section form of axial pass trough is with triangle（Fig. 2）And crescent （Fig. 3）Preferably, triangular-section axial pass trough, is provided that larger passage section, to the flow resistance effect reducing gas relatively Good, disadvantageously can stress concentration in sharp corner.Crescent is preferable to transition of stress, but the passage section being formed is less.

For service life aspect, mainly wear-out life.On the premise of the material quality assurance of guide ring, wear and tear the longevity The size of the ratio pressure suffered by ring when life is solely dependent upon ring and cylinder friction.Generally to ensure that the guide ring life-span is 8000 hours, First ensure cylinder wall surface roughness 0.6 about it is important that being not to be exceeded 0.05MPa than pressure.This requires ring and gas Enough contacts area will be had, so the number of the axial pass trough of ring outer rim is suitably it is impossible to too many between casing wall.

Brief description

Fig. 1 is the utility model piston component view.

Fig. 2 adopts one of guide ring structure schematic diagram of triangle axial pass trough for the utility model.

Fig. 3 adopts the two of the guide ring structure schematic diagram of triangle axial pass trough for the utility model.

Fig. 4 adopts one of guide ring structure schematic diagram of crescent axial pass trough for the utility model.

Fig. 5 adopts the two of the guide ring structure schematic diagram of crescent axial pass trough for the utility model.

Fig. 6 is the fundamental diagram of the utility model guide ring.

In figure is labeled as：1st, piston body；2nd, guide ring；3rd, piston ring；4th, piston rod；5th, inclined open；6th, axial pass trough； 7th, air bleeding valve；8th, axle side compression chamber；9th, lid side compression chamber；10th, intake valve；11st, taper surface；12nd, guide ring opening acute angle；13、 Cylinder wall；B, guide ring opening size；K, guide ring axial height；D, guide ring external diameter；D, guide ring internal diameter；E, triangle lead to Slot cross-section drift angle；Axial gap between F, guide ring and annular groove；M, taper surface axial height；N, taper surface radial width；R, crescent moon The arc radius in shape groove section；Axial gap between F, guide ring and annular groove；Pressure before P1, guide ring（High pressure）；P2, guide ring Pressure afterwards（Low pressure）；P3, guide ring inner circle pressure；P4, guiding annular conical surface pressure.

Specific embodiment

A kind of new non-lubricated compressor piston movement guide ring, as shown in Fig. 1,2,3,4,5,6, including being inserted in piston The guide ring 2 of the corresponding annular groove of body 1, described guide ring offers an inclined open 5, the acute angle of described inclined open 45 ° ~ In the range of 60 °.It is provided with some axial pass troughs 6 on described guide ring is cylindrical.The section of described axial pass trough be triangle or Crescent.It is designed with a taper surface 11 in guide ring at compression chamber, taper is 10 ~ 30 degree.

The gap width B of inclined open is to calculate, B=0.5 π（D+d）（T-t）α+K；Wherein D, guide ring external diameter；d、 Guide ring internal diameter；T, guide ring maximum operating temperature；Average atmospheric temperature when t, guide ring are installed, typically takes 20 ~ 25 DEG C；α、 The linear expansion coefficient of guiding ring material；K, safety allowance, choose according to D, D is big, and K takes large values, and the little K of D gets the small value, K value scope：1~ 4mm.

Two guide rings 2 are arranged in the two ends of piston body 1, arrange the piston ring of sealing gas between guide ring 2 3, piston body 1 top surface and bottom surface form lid side compression chamber 9 and axle side compression chamber 8 with cylinder and inlet valve 10, air bleeding valve 7 respectively, Piston rod 4 drives piston body 1 to move back and forth in the cylinder, periodically alternately carries out in lid side compression chamber 9 and axle side compression chamber 8 Compression work, alternately produces gases at high pressure in two compression chambers.See Fig. 1, the cylindrical taper surface 11 of upside guide ring 2 is arranged on Lid side compression chamber 9 side, the cylindrical taper surface 11 of downside guide ring 2 is arranged on axle side compression chamber 8 side.Taper surface taper is 15 ~ 30 degree, Taper surface axial height m is 0.2 ~ 0.3 times of guide ring axial height K, and conical surface radial width n cannot be greater than guide ring 2 and exceeds The part of piston body 1, that is, require taper surface to cannot be below piston body periphery.

When compressor operation works, forwarder sense 4 drive piston body move back and forth in cylinder, when piston body 1 to During compression chamber motion, the gas in compression chamber is compressed, and gas pressure raises, and gas can be in the presence of pressure differential, from high pressure Area flows to low-pressure area, by guide ring 2, on the basis of pressure P2 after pressure P1 and ring before ring, cylindrical suffered flat of guide ring 2 All pressure is（P1+P2）/ 2, only in the cylindrical suffered average pressure of guide ring 2（P1+P2）The condition of ＞ inner circle pressure P3 Under, guide ring 2 guide ring concentric contraction under the promotion of pressure reduction, reach the ideal bit that guide ring 2 inner headed face is close to annular groove bottom surface Put.

For ensureing guide ring 2 concentric contraction, guide ring 2 is cylindrical to open up axial pass trough 6, when minimizing gas flows through guide ring 2 Gas flow loss, improve ring after pressure P2, finally be improve guide ring 2 periphery suffered by average pressure（P1+P2）/2.Root According to this cylinder operation temperature computation guide ring 2 axial height swell increment it is ensured that under operational temperature conditions guide ring 2 axially high Degree is slightly larger than annular groove height, i.e. hot interference, it is to avoid gases at high pressure enter annular groove bottom surface, prevent ring inner circle pressure P3 from carrying Height, produces frictional resistance simultaneously, prevents guide ring 2 mobile.

Quickly move to compression chamber in piston body 1 simultaneously, the gas shock conical surface 11, make annular conical surface pressure P4, in P4 Promote the lower centripetal holding of guide ring 2, ensure that guide ring 2 inner circle is close to annular groove bottom surface again.

Internal diameter d is more smaller than annular groove basal diameter for guide ring, can absorb guide ring 2 guide ring internal diameter d under delivery temperature Swell increment, simultaneously ensure guide ring 2 Primary Location.

Guide ring inclined open 5 is to ensure that guide ring 2 can quickly dismount manually on piston body 1.Openings of sizes B is to protect Card absorbs guide ring 2 peripheral orientation expansion quantity at the working temperature, prevents opening two end in contact, produces contact stress, leads to guide Ring 2 inner headed face departs from annular groove bottom surface.Why guide ring inclined open 5, adopt angular cut, be to increase guide ring 2 as far as possible Surround the angle of piston body 1.Guide ring opening acute angle, ensureing angle of contact and prevent the principle that acute angle bursts apart little, should 45 ° ~ In the range of 60 °.

By the integrated application of above measure it is ensured that guide ring 2 inner headed face is close to annular groove bottom surface, make outside guide ring 2 Average pressure suffered by circle（P1+P2）/ 2 maximizations, guide ring inner circle pressure P3 minimizes, thus in the presence of pressure reduction, Guide ring 2 is made to hold piston body 1 tightly.

Claims (5)

1. a kind of new non-lubricated compressor with piston movement guide ring it is characterised in that：Including being inserted in the corresponding annular groove of piston body Guide ring, described guide ring offers an inclined open, the acute angle of described inclined open is in the range of 45 ° ~ 60 °.

2. a kind of new non-lubricated compressor according to claim 1 with piston movement guide ring it is characterised in that：Described It is provided with some axial pass troughs on guide ring is cylindrical.

3. a kind of new non-lubricated compressor according to claim 2 with piston movement guide ring it is characterised in that：Described The section of axial pass trough is triangle.

4. a kind of new non-lubricated compressor according to claim 2 with piston movement guide ring it is characterised in that：Described The section of axial pass trough is crescent.

5. a kind of new non-lubricated compressor according to claim 1 and 2 with piston movement guide ring it is characterised in that： In guide ring near the cylindrical place of compression chamber, it is designed with a taper surface, taper is 10 ~ 23 degree.