DE1889263U - SEALING FOR MACHINE PARTS AT STANDING OR MOVING INTO EOTHER. - Google Patents

Description

Sealing ^ / ^ uhende ^ or moved against each other /

Machine parts 6 - ·

The innovation concerns the sealing of dormant or against each other moving machine parts, preferably for mechanical seals, consisting of minfestens ein.Dichtelement and relates in particular on-the: combination of partially known sealing elements, ^ in particular; those made of polytetrafluoroethylene and Copolymers of vinylidene fluoride and hexafluoropropylene, which can have primarily 0-ring s-shape and for sealing ν, αη -; _.- dormant or machine parts moving against each other, preferably are-used-for-oil-ring-seals. . ;

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For the sealing of sliding and counter rings of axial sliding ring seals as well as of other machine parts, it is known to use sleeves or -Os made of polytetrafluoroethylene ^τ or other Ifluoroelastomers .. O-B.inge are particularly characterized by low structural dimensions; the end. / When using collars interchangeability with O-rings by which ^is:; different dimensions no longer guaranteed. Massive. Ö-Singe: made of polytetrafluoroethylene have in practical use- -_. due to the insufficient .. elasticity ,, den. high expansion coefficient; ζients and those belonging to this material. The tendency to flow, especially at intermittent temperatures, has not been proven. .; . - ".:".

The subject of innovation will now be. these constructions, so those. . lack of elasticity, and thus a real dieht function ^: ..; have avoided. The innovation relates to the sealing of stationary or mutually moving machine parts .. preferably for mechanical seals, consisting of -at least one sealing element and is characterized in that the sealing element as \ -Elng- with eifrem.to beyond its cross-sectional center _: - point beyond Slot in which a correspondingly adapted expanding ring engages with its “lase” is “formed”. The Hing used in the sealing element can be an O-Elng. The slot to the outer circumference; de's ring have inclined flanks. The hooks of the nose of the expansion ring can be inclined in a wedge shape. Furthermore _{, the} O-ring and the expansion ring can have approximately the same coefficient of thermal expansion

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. "possess Also, the _O-ssing from Polyteträfluorätiiylen ■ · exist and the slot DES O-ring can parallel to the sealed shaft, ie in the axial sighting of these are .. ■" - .. """

According to the invention, the spreading effect of the O-ring. can be reinforced by an additional force, the additional force being applied by a helical spring or the seal is designed in such a way that the sealing elements are additionally pressed on by the medium pressure. Furthermore, the seal can be so ■ -. be designed so that the sealing elements are additionally pressed on by the thermal expansion of the associated rings. '' ■ '

Two sealing elements can also be arranged one behind the other in the sealing direction. An elastic Diölrb element preferably one; O-ring made of copolymers - τοη tinylindene fluoride and. Hexa- ■ --..- fluoropropylene can be placed before or after the sealing elements to improve the expansion effect in the sealing. The associated elastic O-rings can consist of fluoroelastomers. \ ■ ■■ -. " ^: -.- .. -:. - -" -:

Since experience has shown that polytetrafluoroethylene is resistant to almost all chemicals, while this is the case with the other fluorine "■". elastomeric is not the case to the same extent, it is expedient, a .Sealing element made of fluoroelastomerea under high chemical attack to connect a sealing element made of polytetrafluoroethylene. - _; 'Since both factory taffies are in approximately the same temperature range'":a" ge—. '

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can be set., add up like this: the door parts of the chemical resistance and the elasticity. . _:

Based on the figures shown in the drawing, the -firing are described in more detail./ It .shows: ■ "" ■ '■ - ... ·

1 shows a g-slotted: Ö input with an expanding ring according to ^: the invention for sealing a _: shaft; _ -. -

back- ■ ".."".. - ■; ■"' ^: "--..- .. \ - - ^: - Fig. 2 two tightly spaced sealing elements from one -"

slotted O-bing and an expanding ring,! also .. decorative sealing of a. Wave. . ; ν ■■■ -_. : "" .-. : -. ': -, ■ _ ..

In Fig. A , 1 denotes the slotted O-Mng, /: in the slot 13 of which a rabbit 14 of the expanding ring 2 engages. . The arrangement _of: sealing elements 1,2 is here in the axial direction ^: taken to the shaft so, that it is possible, .- further increase the spreading ■ effect of the sealing element characterized in that on the expansion ring 2 once the medium φ -1-sin acts. In addition, a laid around the shaft helical spring 3, DTE with a ^her: end 17 "expresses ,, while they are, with their other end against a shoulder 18 on the shaft β supported ■.." Directly against the expander 2 - ". -.- "- ■" - "■■ '..-."

Dn. the embodiment shown ist.der O-In 1 ^ provided with parallel flutes-15, while the Spreizring- ΆέΛ 2

its nose 14 has a wedge-shaped inclined blank 16. The.; Di EHT we arrangement d__ it in the housing -G-Ie ring 7 is held, while the stationary seal ring by the "two switched in Strain" ■■ - ■ is mounted elastically sealing elements 4 and _r 5_. .. "- _: ■ _

Fig. 2 shows a - another mechanical seal design, in. ■ -.- "which the slotted O-ring 1 using the expansion ring 2 and_des O-ring 9 connected in series, seals the gap between the shaft 6 and the circumferential housing sliding ring 7 while at the same time - using the blocking pressure p. ... ■ - Here, the E-ring 9 is preferably formed from copolymers of vinylidene fluoride and Hexaflouorpropylen the do.ppeltelästisch mounted counter-ring 8 is -through the sealing elements tO and 11 from Pölytetra- _ fluoroethylene ^for: aggressive medium sealed off, -. while the chemically not so resistant O-RihgV 1.2 made of -fluoroelastomer: forms the secondary seal in order to take over the primary seal in the event of softening operating conditions, in which the vacuum should also be sealed.

The advantage of the series connection of the sealing elements mentioned is. also to see therein, that using copolymers of vinylidene fluoride and hexafluoropropylene are much larger ■: - Shaft deflections can be bridged without loss of the dieht function can and beyond that too. "The vibration damping of the much more elastic memory material has a very beneficial effect on the life

* - the long-term and operational safety of the mechanical seal. .

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Especially with changing lemgeraturbeansEruohung- it is säir. advantageous if the 0 ring and the expanding ring of the Di cJit element it have the same coefficients of thermal expansion.

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Claims (13)

S c h τι tζ a: n s ρ r ü e h e 1. Sealing ^ resting against each other or moved / Machine _"-. - parts, preferably .for Grleitringdichtungen," consisting of at least one sealing element ,: characterized in that ,: ..; the sealing element (1, 2) as a ring (1) .. with; a slot (13) which extends beyond its cross-sectional area and into which a correspondingly adapted expansion ring (2) engages with its rabbit (14). . -. 2. Seal according to claim \ characterized in that the ring (T) used in the sealing element (i, 2) is an O-ring. \ 3. Seal according to one or both of the preceding address characterized in that. the slot (13) to the outer periphery of the ring (1) has inclined planks (1.5). ^ - 4. Seal according to one or more of the previous claims ..- characterized in that the planks (16) of the rabbit (14) of the expansion ring (2) are inclined in a wedge shape. ^: - .. - 5. AbäliQhtung according to one or more of the preceding claims " characterized in that the slotted. O-ring (1) and the. - 8th Spreader ring (2) has approximately the same coefficient of thermal expansion; "own. ■ -.-....: ■■■ · 6. Seal according to one or more of the preceding claims, characterized in that the O-ring (1) made of polytetrafluoroethylene consists. 7. Seal according to one or more of the preceding claims, characterized in that the slot (13) of the O-ring (T) parallel to the sealing shaft (6), that is to say in the axial direction with this. -. . '; - 8. Seal according to one or more of the preceding claims, characterized in that the spreading effect is reinforced by an additional force (3, · Jh, f- *). 9. Seal according to one or more of the preceding claims "". characterized in that the additional force is provided by a: -spring. (3), preferably helical spring (3) is applied. 10. Seal according to one or more of the preceding claims, characterized in that the seal is designed such that the sealing elements (1, 2) through the medium ■ _ pressure (P.) additionally pressed. 11. Seal according to one or more of the preceding claims characterized in that - the seals are designed in this way . forms: are that / the di elite learn te (1,2) through the warmth -, _ .. " expansion of the assigned hinge (7, 9) additionally increased - ■ '-. ". · will fit. ^ - - ■ "" ": '" /. ■', - "- ■ ■ -., -.-- ■" - 12. Seal according to one or more of the preceding claims ;: characterized ^ - "that-two sealing elements (1,2) in Are arranged one behind the other in the sealing direction. 13. Sealing according to one or more of the preceding claims - characterized ,, dass.ein elastic sealing element (9), preferably an O-ring made of copolymers, of "~ vinylidene fluoride and hexafluoropropylene to improve the expansion effect is followed up.. .- ■■: ■ ". ,,.; ■;" .-. - ■■■ ... ■■ "-.- T4-. Seal according to one or more of the preceding claims characterized in that the associated elastic O-rings (9) consist of - fluoro elastomers. D / bed 5