• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention relates to a double sealing device for rotating shaft and a pump comprising such a device Device comprising a first and a second seals mounted side by side in a circular cylindrical housing traversed by the shaft to be sealed, these joints each consisting, on the one hand, of a bearing ring with an outer axial flange and an inner radial flange and, on the other hand, a sealing washer forming a sealing lip slidingly on the shaft, the first seal ensuring the sealing of a first fluid medium and the second seal ensuring the sealing of a second fluid medium. Double sealing device (1) characterized in that the axial flange of at least one of the bearing rings (8, 9) of the first and second seals (3, 4) has an extension at its free end , which constitutes a perforated or cut-out ring structure, not covered by the sealing washer of the corresponding seal (3, 4), located substantially facing the peripheral groove (7) and directed towards the other seal (4, 3).
    公开号:FR3018575A1
    申请号:FR1452053
    申请日:2014-03-12
    公开日:2015-09-18
    发明作者:Dominique Lutaud
    申请人:Carl Freudenberg KG；
    IPC主号:
    专利说明:

    [0001] The present invention relates to the field of sealing shafts or axes in rotation, and more particularly the double insulating sealing systems two environments different from each other and with respect to the outside, the two environments possibly being at different pressures. In this context, the subject of the invention is a double sealing device and an injection pump comprising such a device. Currently, in the aforementioned context, the double seal is typically obtained by placing, in the housing traversed by the shaft, two seals each adapted to the corresponding medium to seal and arranged in succession of one another, with a spacing, in the axial direction. In the case of injection pumps, double sealing is currently carried out, traditionally by, on the one hand, a rubber ring 15 on the oil side, and on the other hand, a rubber or PTFE sealing ring. with a "special pressure" profile on the diesel side. The two parts are assembled heads spades in different housing diameters, and a channel is machined in the housing between the two rings, in case of leakage, evacuate the liquid outside. This channel also serves to maintain the atmospheric pressure in this zone. This solution, an embodiment of which is represented in FIG. 1, has two major limitations: it requires a large axial space requirement, of the order of at least 20 mm (at least 18.5 mm) and requires a housing in two compartments with different diameters, each adapted to one of the two seals. In the absence of compartments of different radial size, the precise positioning of the joints, also between them, and the non-obstruction of the evacuation channel could possibly not be guaranteed. The present invention aims to overcome these limitations. To this end, it relates to a double sealing device for rotary shaft, in particular for a shaft or rotary shaft of a fuel injection pump, comprising a first and a second seal of annular constitution, mounted side by side in a circular cylindrical housing traversed by the shaft to be sealed and in which opens a channel - 2 - of flow and / or venting, at a peripheral groove formed in or associated with the housing wall between the two seals, these seals each consisting, on the one hand, of a carrier ring of metallic material with an outer axial flange and an inner radial flange and, on the other hand, a washer of preferentially based on PTFE and reported on the corresponding carrier ring so as to cover at least partially the outer face of its axial flange, and thus achieve a seal between the latter and the king of the housing, as well as the adjoining face of the radial wing, and to extend beyond the free end of the radial flange to form a sealing lip bearing sliding on the shaft to be sealed, the first seal ensuring the sealing of a first fluid medium with respect to the peripheral groove and the second seal ensuring the sealing of a second fluid medium with respect to this groove, double sealing device characterized in that the wing axial axis of at least one of the carrier rings of the first and second seals comprises an extension, at its free end, which constitutes a perforated or cut ring structure, not covered by the sealing washer of the corresponding seal, located substantially opposite the peripheral groove and directed towards the other seal. The invention will be better understood, thanks to the following description, which refers to preferred embodiments, given by way of non-limiting examples, and explained with reference to the appended diagrammatic drawings, in which: FIG. a partial sectional view, in a plane containing the central axis of the shaft to be sealed, of an injection pump or the like equipped with a double sealing device according to one embodiment of the invention; Figures 3 and 4 are side elevational views and at a different scale of details A (Figure 3) and B (Figure 4) of Figure 1; Figures 5A and 5B are partial sectional, side elevational and perspective views of the first seal of the device of Figures 2 to 4; FIG. 6 is a partial view in section and in perspective of the second seal of the device of FIGS. 2 to 4, and FIGS. 7 and 8 are perspective views of the two embodiments of the first seal of the device according to FIG. 'invention. FIG. 1, and partially FIGS. 3 and 4, show a double sealing device 1 for rotary shaft 2, in particular for shaft 5 or rotary axis of a fuel injection pump. This device comprises a first 3 and a second 4 seals of annular constitution, mounted side by side in a circular cylindrical housing 5 through which the shaft 2 to be sealed and into which a flow channel 6 and / or venting, at a peripheral groove 7 formed in the wall of the housing 5, between the two seals 3 and 4. These seals 3 and 4 each consist, on the one hand, of a bearing ring 8 or 9 made of metallic material with an external axial flange 8 'or 9' and an internal radial flange 8 "or 9" and, on the other hand, a sealing washer 15 preferably 10 or 11 based PTFE and reported on the corresponding carrier ring 8 or 9 so as to cover at least partially the outer face of its axial flange 8 'or 9', and thus achieve a seal between the latter and the housing wall 5, and the adjoining face of the radial wing 8 "or 9", and to extend beyond the free end 20 of the radial flange 8 "or 9" to form a sealing lip 13 or 14 slidingly abutting on the shaft to be sealed 2. The first seal 3 ensures the seal of a first fluid medium MLPE with respect to the peripheral groove 7 and the second seal 4 seals a second fluid medium MLPF with respect to this groove 7. As shown in FIG. 2, the housing 5, receiving both 3 and 4 joints may have a constant diameter, is formed in a housing or housing 5 'and may be part of a passage through which the shaft 2 (this passage may optionally comprise one or bearings for guiding the shaft , not shown). According to the invention, the axial flange 8 ', 9' of at least one of the bearing rings 8, 9 of the first and second seals 3, 4 comprises an extension, at its free end, which constitutes a perforated or cut ring structure 12, not covered by the sealing washer 10, 11 of the seal 3, 4 corresponding, located substantially facing the peripheral groove 7 and directed towards the other seal 4, 3. Preferably, the two joints 3 and 4 are mounted side by side and tightly (preferably with a slight compression) in the housing 5, preferably with abutment in the axial direction XA, said at least one perforated or cut ring 12 also forming spacing structure or axial bracing between the two seals 3 and 4, releasing the peripheral groove 7 over substantially its entire width. Thus, the two joints 3 and 4 can be accurately positioned closer to one another in the axial direction XA, while ensuring fluid communication between the free space 5 "of calibrated width (by the width of the ring 12) located between the two seals 3 and 4 and the groove 7 (and therefore with the channel 6.) According to a first variant embodiment, as shown in FIGS. 2 to 5 and 7, the perforated ring 12 , formed integrally in the extension of the axial flange 8 ', comprises holes 12' regularly spaced around the circumference of the carrier ring 8 concerned.
    [0002] According to a second variant embodiment, as shown in FIG. 8, the cut ring 12 formed in one piece in the extension of the axial flange 8 'of the bearing ring 8 concerned has a crenellated free edge 12 ". Preferably, and as illustrated in FIGS. 2 to 8, only one of the two joints 8 and 9 comprises a perforated or cut-off spacer ring 12, preferably the first seal 8 sealing the MLPE medium having the pressure The person skilled in the art understands that the assembly of the two seals 3 and 4 forming the device 1 is carried out by introducing under pressure the first seal 3 into the housing 5 and bringing it to the bottom of the latter. The latter is advantageously made in the form of a mounting chamfer having a small angle at the apex, advantageously less than 30 °, preferably of the order of 15 °, in the direction of insertion of said joi 3. The positioning at the end of the assembly of this first seal 3 with the aid of an abutment makes it possible to guarantee a precise and repetitive location of the two mutually abutting components 3 and 4 of the device 1 with respect to said groove 7.
    [0003] In addition, because of a housing 5 having a constant diameter (same diameter for the two axial portions of the housing respectively receiving the first seal 3 and the second seal 4), no additional compression is necessary when the establishment of the first seal 3 in its final position (the compression undergone in its first introduction phase, before the passage of the groove 7, is sufficient for this final establishment). This greatly limits the risk of attachment of the sealing ring portion 10 covering the outer face of the axial flange 8 'of the ring 8 of the seal 3. It is also possible to envisage an embodiment of the invention. in which no specific groove 7 is formed in the wall of the housing 5. Indeed, the gap between the ring 12 and the inner wall of the housing 5 (provided by the thickness of the compressed washer portion 10 covering the axial flange 8 ') could provide a peripheral circular channel similar to such a groove, in which the holes 12', on the one hand, and the flow channel 6, on the other hand, would open. Advantageously, and in order to obtain a good dynamic seal around the shaft 2, it can be provided that the sealing lip 13, 14 of each seal 3, 4 is constituted by an annular connecting portion 13 ' , 14 'bent and an annular end portion 13 ", 14" mainly sliding bearing on the shaft or the axis to be sealed 2, said annular end portion 13 ", 14" being advantageously provided with a structure delivery head 15, 15 'helical or thread-shaped, advantageously in the form of a groove with opposite sides of inclinations or different slopes, preferably section or profile of asymmetrical triangular shape. As can be seen by way of example, FIGS. 3 to 5 in particular, one 8 of the bearing rings 8, 9, preferably that of the first seal 3 sealing the MLPE highest pressure medium and having the extension 12 forming a perforated ring. bracing, has in section substantially a form of tiny tau (T), with a curved radial flange 8 ", the sealing washer 10 extending on the inner face of this curved radial flange 8", directed towards the middle under high pressure MLPE. In connection with this construction of the first seal 3, it may further be provided that the sealing lip 13 has a small thickness, typically less than 0.8 mm and forms, in the absence of stress, a frustoconical sleeve with a apex angle preferably between 40 ° and 80 ° and oriented towards the medium to be sealed MLPE. This first seal 3 may, in particular, correspond to a seal having the characteristics of the subject of the French patent application No. 12 58667 in the name of the applicant. According to another advantageous characteristic of the invention, in particular from FIGS. 3, 4 and 4, one of the bearing rings 8, 9, preferably that of the second seal 4 ensuring the tightness of the lower pressure medium MLPF, presents in section an L-shaped or chevron, the corresponding sealing washer 11 being attached to the outer faces of the radial flange 8 "and axial 8 ', that is to say the faces 10 located opposite the middle This second gasket 4 may, in particular, correspond to a gasket having the characteristics of those objects of French Patent Applications Nos. 2,554,878 and 2,986,598 in the name of the Applicant. The implementation of the two types of particular joints mentioned above allows the double sealing device 1, according to the invention, to provide a sufficient seal for the two media MLPE and MLPF, while requiring only a space requirement. xial minimum, especially about 10 mm only. The invention also relates, as partially shown in FIG. 1, to an injection pump with an axis or rotating shaft 2 extending simultaneously in a first MLPE space subjected to a high fluid pressure, namely of gasoline. or gas oil, and in a second MLPF space subjected to a lower fluid pressure, namely oil.
    [0004] This pump is characterized in that it comprises a double sealing device 1 as previously described. Of course, the invention is not limited to the embodiments described and shown in the accompanying drawings. Modifications are possible, especially from the point of view of the constitution of the various elements or by substitution of technical equivalents, without departing from the scope of the invention.
    权利要求:
    Claims (10)
    [0001]
    REVENDICATIONS1. Double sealing device for a rotary shaft, in particular for a fuel injection pump shaft or rotary shaft, comprising a first and a second ring-shaped seal, mounted side by side in a circular cylindrical housing traversed by the shaft 5 and in which opens a flow channel and / or vent, at a peripheral groove formed in or associated with the wall of the housing, between the two seals, these seals being each consisting, on the one hand, of a carrier ring of metallic material with an outer axial flange and an inner radial flange and, on the other hand, a sealing washer preferably based on PTFE and attached to the corresponding carrier ring so as to cover at least partially the outer face of its axial flange, and thus provide a seal between the latter and the housing wall, as well as the att the radial wing, and to extend beyond the free end of the radial flange to form a sealing lip bearing sliding on the shaft to be sealed, the first seal ensuring the seal a first fluid medium with respect to the circumferential groove and the second seal ensuring the sealing of a second fluid medium with respect to this groove, double sealing device (1) characterized in that the axial flange (8) ', 9') of at least one of the carrier rings (8, 9) of the first and second seals (3, 4) has an extension, at its free end, which constitutes a perforated or cut ring structure. (12), not covered by the sealing washer (10, 11) of the corresponding seal (3, 4), situated substantially facing the circumferential groove (7) and directed towards the other seal (4, 3) .
    [0002]
    2. Device according to claim 1, characterized in that the two seals (3 and 4) are mounted side by side and tightly in the housing (5), preferably with abutment in the axial direction 30 (XA), said at least one perforated or cut ring (12) also forming a spacing or axial spacing structure between the two seals (3 and 4), disengaging the circumferential groove (7) over substantially its entire width.
    [0003]
    3. Device according to claim 1 or 2, characterized in that the perforated ring (12), formed in one piece in the extension of the axial flange (8 '), comprises bores (12') regularly spaced around the circumference of the bearing ring (8) concerned.
    [0004]
    4. Device according to claim 1 or 2, characterized in that the cut ring (12), formed in one piece in the extension of the axial flange (8 ') of the bearing ring (8) concerned, comprises a crenellated free edge (12 ").
    [0005]
    5. Device according to any one of claims 1 to 4, characterized in that only one of the two seals (8 and 9) comprises a perforated ring or cut bracing (12), preferably the first seal (8). sealing medium (MLPE) with the highest pressure.
    [0006]
    6. Device according to any one of claims 1 to 5, characterized in that the sealing lip (13, 14) of each seal (3, 4) is constituted by an annular connecting portion (13 ', 14' ) bent and an annular end portion (13 ", 14") predominantly in sliding abutment on the shaft or the shaft to be sealed (2), said annular end portion (13 ", 14") being advantageously provided a helical or thread-like delivery structure (15, 15 '), advantageously in the form of a groove with opposite flanks of different inclinations or slopes, preferably with an asymmetric triangular section or profile.
    [0007]
    7. Device according to one of claims 1 to 6, characterized in that one of the carrier rings (8, 9), preferably that of the first seal (3) sealing the medium at the highest pressure (MLPE) and having the extension (12) forming a perforated spacer ring, has in section substantially a small tau form (t), with a curved radial flange (8 "), the sealing washer (10) extending on the inner face of this curved radial wing (8 "), directed towards the medium under high pressure (MLPE).
    [0008]
    8. Device according to claim 7, characterized in that the sealing lip (13) has a small thickness, typically less than 0.8 mm and forms, in the absence of stress, a frustoconical sleeve with an angle at the top preferably between 40 ° and 80 ° and oriented toward the medium to be sealed (MLPE).
    [0009]
    9. Device according to any one of claims 1 to 8, characterized in that one of the carrier rings (8, 9), preferably that of the second seal (4) sealing the pressure medium less high (MLPF), has in section an L-shaped or chevron, the corresponding sealing washer (11) being attached to the outer faces of the radial (8 ") and axial (8 ') wings, that is to say ie the faces located opposite the pressure medium to be sealed (MLPF).
    [0010]
    10. Injection pump with an axis or rotary shaft extending simultaneously in a first space subjected to a high fluid pressure, namely gasoline or gas oil, and in a second space subjected to a lower fluid pressure, that is to say oil, pump characterized in that it comprises a double sealing device (1) according to any one of claims 1 to 9.
    类似技术:
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    同族专利:
    公开号 | 公开日
    CN104913060B|2017-12-26|
    BR102015004981A2|2016-05-24|
    JP2015175522A|2015-10-05|
    US9845882B2|2017-12-19|
    EP2918878B1|2017-11-22|
    CN104913060A|2015-09-16|
    EP2918878A1|2015-09-16|
    JP6029700B2|2016-11-24|
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
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    US6561519B1|2000-11-08|2003-05-13|Freudenberg-Nok General Partnership|Dual seal|EP3203122A1|2016-01-25|2017-08-09|Carl Freudenberg KG|Angular detection device with protection against external contaminants|US2167603A|1936-11-06|1939-07-25|Victor Mfg & Gasket Co|Grease retainer with unitary diaphragms and supports|
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    DE102010001345B4|2010-01-28|2013-09-19|Trelleborg Sealing Solutions Germany Gmbh|Rotary union|
    EP2554878B1|2011-08-03|2016-07-13|Carl Freudenberg KG|Seal|
    FR2986598B1|2012-02-03|2015-03-27|Freudenberg Carl Kg|SEAL|
    FR2995652B1|2012-09-14|2014-09-26|Freudenberg Carl Kg|SEAL, ESPECIALLY FOR PRESSURIZED LIQUID|FR2995652B1|2012-09-14|2014-09-26|Freudenberg Carl Kg|SEAL, ESPECIALLY FOR PRESSURIZED LIQUID|
    CN108612667A|2016-12-09|2018-10-02|镇江立中机械设备有限公司|Wind turbine non-contact mechanical seal structure|
    DE102017004061B4|2017-04-27|2019-01-31|Carl Freudenberg Kg|poetry|
    CN111801522A|2018-03-14|2020-10-20|世利可株式会社|Rotary motion sealing device|
    JP2020076450A|2018-11-07|2020-05-21|本田技研工業株式会社|Seal structure|
    CN111720567A|2020-06-10|2020-09-29|肯卓自控工程有限公司|Pressure balance type sleeve regulating valve core seat sealing structure|
    CN111895092A|2020-07-01|2020-11-06|谭金泉|Shaft sealing device of compressor|
    法律状态:
    2016-01-28| PLFP| Fee payment|Year of fee payment: 3 |
    2017-03-29| PLFP| Fee payment|Year of fee payment: 4 |
    2018-01-26| PLFP| Fee payment|Year of fee payment: 5 |
    2020-03-26| PLFP| Fee payment|Year of fee payment: 7 |
    2021-03-23| PLFP| Fee payment|Year of fee payment: 8 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1452053|2014-03-12|
    FR1452053A|FR3018575B1|2014-03-12|2014-03-12|DOUBLE SEALING DEVICE FOR ROTARY SHAFT AND PUMP COMPRISING SUCH A DEVICE|FR1452053A| FR3018575B1|2014-03-12|2014-03-12|DOUBLE SEALING DEVICE FOR ROTARY SHAFT AND PUMP COMPRISING SUCH A DEVICE|
    EP15152981.5A| EP2918878B1|2014-03-12|2015-01-29|Double sealing device and an injection pump comprising such a device|
    BR102015004981A| BR102015004981A2|2014-03-12|2015-03-06|double sealing device for rotary shaft and pump including this device|
    CN201510105550.4A| CN104913060B|2014-03-12|2015-03-11|For rotary shaft double seal and include the pump of this device|
    US14/645,473| US9845882B2|2014-03-12|2015-03-12|Double sealing device|
    JP2015049099A| JP6029700B2|2014-03-12|2015-03-12|Double seal device for rotating shaft and pump provided with the double seal device|
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