• 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:

    公开号:SE1450167A1
    申请号:SE1450167
    申请日:2014-02-13
    公开日:2015-08-14
    发明作者:Elias Bartos；Petter Rybäck
    申请人:Scania Cv Ab；
    IPC主号:
    专利说明:

    30 35 the pressure load on the floor seal. Even in this case, a space-consuming construction is obtained.
    SUMMARY OF THE INVENTION The object of the present invention is to provide a floor seal with a compact design which provides a good seal of a radial space where a rotatable shaft extends into a housing in which there is a higher pressure than in an area outside the housing.
    This object is achieved with the floor seal of the type mentioned in the introduction, which is characterized by the features stated in the characterizing part of claim 1.
    The floor seal thus comprises a pressure-relieving unit which is adapted to be arranged in the second part of the radial space and to create there a zone adjacent to said sealing element where there is a lower pressure than in the first inner area of the housing where the pressure can be very high. . With such a pressure-relieving unit, the pressure load on the sealing elements can be significantly reduced. The floor seal can thus provide a good seal even at times when the pressure in the first interior area of the house is very high. Since the pressure-relieving unit is included in the floor seal, it can be described as an integral part of the floor seal. A floor joint comprising a pressure-relieving unit with a suitable construction requires only a small extra space in relation to the space required by a conventional floor seal. Such a floor seal has a compact design at the same time as it provides a good seal even when there is a high pressure in said first inner area of the housing.
    According to an embodiment of the present invention, the pressure-relieving unit is included in the rotatable part of the plant stem. The rotatable part of the floor seal is usually mounted further into the housing than the static part of the floor seal. It is therefore suitable to arrange the pressure-relieving unit of this part of the floor seal which is arranged in connection with the pressurized second part of the radial space.
    Alternatively, the static part of the floor seal can be mounted further into the housing than the rotatable part of the floor seal. In this case, the pressure-relieving unit is arranged on the static part of the floor seal. According to an embodiment of the present invention, the pressure-relieving unit comprises a pressure-relieving ring which is arranged in an annular recess of the floor seal. A pressure-relieving unit comprising such components requires a very small mounting space. The pressure relief ring may comprise a surface which is adapted to abut with a pressure against a wall surface of the annular recess so as to create a passage between said surfaces in which a medium provides a pressure drop. The pressure acting on the surfaces can be created by the pressure difference that the medium has on opposite sides of the pressure relief unit. The pressure relief ring may have a radially outer surface which is adapted to abut with a pressure against the inner surface defining the through hole in the housing and a radial inner surface which is adapted to be located at a distance from a bottom surface of the radial recess.
    In this case, the pressure relief ring will be held in a non-rotating position of the stationary inner surface while the surfaces of the radial recess rotate with the rotatable shaft. According to an embodiment of the present invention, the pressure relief ring is pre-assembled in the annular recess. The floor seal and the pressure-relieving unit can in this case be mounted as a continuous unit in said space.
    The pressure relief ring is advantageously made of a rigid material.
    The pressure relief ring can, for example, be made of bearing bronze, brass, rigid plastic material or nylon material. The annular recess is advantageously also arranged in a body of a rigid material such as a suitable metal material. Since the surfaces of the pressure relief ring and the surfaces defining the annular recess are made of rigid materials, they maintain their shape when pressed against each other.
    Thus, irregularities and other irregularities in the surfaces form narrow passages adjacent to the surfaces through which a medium can pass. However, the agent receives a pressure drop as it passes through the narrow passages.
    According to an embodiment of the present invention, one of the parts of the floor seal comprises a movably arranged sealing element and a capercaillie member which is adapted to press sealing elements against the sealing element in the remaining part of the floor seal. With such a capercaillie member, the sealing elements are held together by a capercaillie force, which ensures that they always abut tightly against each other in an optimal way so that leakage is avoided. According to an embodiment of the present invention, said part of the floor seal comprises a sealing means which prevents leakage in connection with the movably arranged sealing element. Gap-shaped passages inevitably occur between a movably arranged sealing element and surrounding surfaces. By arranging a sealing member such as an O-ring in a suitable position adjacent to the movably arranged sealing element, leakage through such a passage can be prevented.
    According to an embodiment of the present invention, one of the parts of the floor seal comprises a fastening material for testing the sealing element. With such an attachment, no gap-shaped passages are created where a medium can leak past the sealing element.
    The sealing element is advantageously held in a suitable position by means of a fastening material which has certain elastic properties. Thus, the sealing element has a certain mobility, which ensures that it can essentially always be made to abut tightly against the other sealing element. Preferably, one of the sealing elements is movable and the other sealing element is attached with a suitable testing material.
    The present invention also relates to an assembly comprising a housing, a rotatable shaft extending through a through hole of the housing, and a radial space between the rotatable shaft and an inner surface defining the through hole in the housing which has a distance between an area which is located outside the housing and a first area which is located inside the housing where there is a higher pressure than in the outside area, said radial space a planar seal according to any one of the preceding claims. The unit can be a pump, turbine, hydraulic retarder or other type of unit where a large internal pressure can be created at least locally in connection with an area where a rotatable shaft extends into a housing of the unit.
    According to a. Embodiment of the present invention, the assembly comprises a passage adapted to connect said zone arranged in connection with said sealing element to a second internal area of the housing where there is a lower pressure than in the first internal area. Thus, the medium, which is led past the pressure-relieving unit and reaches said zone, can be led back to an internal ear area in the housing with a low pressure. In this case, the pressure in the second interior area of the housing defines the pressure prevailing in said zone. The learning curve corresponds to the pressure in the second inner region of the housing substantially the pressure prevailing in the outer region of the housing. BRIEF DESCRIPTION OF THE DRAWINGS In the following, as an example, a preferred embodiment of the invention is described with reference to the accompanying drawing, in which: Fig. 1 shows a floor seal comprising pressure-relieving units according to the present invention and Figs. 2 shows an area of the floor seal in more detail which comprises one of the pressure-relieving units.
    DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION Fig. 1 shows a part of a housing 1 of an assembly which in this case is exemplified as a pump which is adapted to circulate a liquid-like medium in a conduit circuit. A rotatable shaft 2 extends into the housing via a through hole in a wall of the housing 1.
    The rotatable shaft 2 is driven by a drive source (not shown) which is arranged externally about the housing 1. The housing 1 is surrounded by an external area A which consists of air with atmospheric pressure. The rotatable shaft 2 is provided with vanes 3 or similar components inside the housing 1 with which the liquid-containing medium is pressurized in a first inner region Bi of the housing 1. The liquid-shaped medium can by means of the vanes 3 provide a relatively high pressure in the first inner region Bi of the housing 1. As the shaft 2 with the vanes rotates, the liquid medium is sucked to the first inner region B1 from a second inner region Bg of the housing 1 where it has a much lower pressure. The pressurized liquid medium in the first inner region Bi is led to a channel 4 of said circuit.
    A floor seal 5 is arranged in a radial space 6 which is located between the rotatable shaft 2 and an inner surface 7 which defines the through hole in the housing 1. The floor seal 5 is arranged in a part of the radial space 6 where it has a locally increased width. The inner surface 7 is here located at a relatively large distance from the peripheral surface of the shaft 2. The floor seal 5 comprises a first static part Sa and a second rotatable part 5b. The static part Sa comprises a test element 8 which is attached to the inner surface 7. The fastener element 8 comprises a recess which encloses a first annular sealing element 9 which comprises a first flat sealing surface 9a.
    The recess of the fastening element 8 also encloses a capercaillie member 10 which loads the sealing element 9 with a capercaillie. and a seal which may be an o-ring 1 1. The rotatable part 5b comprises a fastening element in the form of a carrier 12 which is fastened to a peripheral surface of the shaft 2. The rotatable part Sb of the plane seal thus rotates with the shaft 2. The carrier 12 comprises a recess where a second annular sealing element 13 is fastened by means of a fastening material 14 which may have elastic properties.
    The second sealing element 13 comprises a second flat sealing surface 13a which is adapted to abut against the first flat sealing surface 9a of the first sealing element 9. The first flat sealing surface 9a is pressed against the second flat sealing surface 13a by means of the spring means 10. When the sealing surfaces 9a, 13a are manufactured with a very large capacity, a tight connection is created between the flat sealing surfaces 9a, 13a. The tight connection between the flat sealing surfaces 9a, 13a divides the radial space 6 between the rotatable shaft 2 and the inner surface 7 into a first part 6a which contains air with atmospheric pressure and in a second part 6b which contains the liquid medium. The second part 6b of the space extends from the sealing elements 9, 13 and inwards in the housing 1 to the first inner area Bi where the liquid medium is pressurized by the vanes 3. The carrier 12 comprises a first annular peripheral recess 15 which is provided with a first pressure relief ring 16 and a second annular peripheral recess 17 provided with a second pressure relief ring 18. The carrier 12 and the pressure relief rings 16, 18 are made of rigid material.
    Fig. 2 shows the first peripheral recess 15 and the. first pressure relief ring 16 in more detail, The pressure relief ring 16 in this case has a rectangular cross-section an axial plane. The pressure relief ring 16 has a radially outer surface 16a which abuts a force against the inner surface 7 defining the through hole in the housing 1 and a radially small inner surface 16b which is located at a gap-shaped distance from a bottom surface 15a in the recess 15. The pressure relief ring 16 comes thus not to rotate with the shaft 2. The high pressure in the first internal area B; of the housing 1 results in the pressure relief ring 16 being subjected to a pressure so that a front surface 16c of the pressure relief ring 16 is pressed against a front side surface 1519 of the recess 15.
    This creates a very narrow passage for the liquid-unifying medium in the area between the front surface 16c of the pressure relief ring and the recess side surface 15b. The narrow passage can be equated with a strangulation. The liquid medium can pass through the passage in a limited amount at the same time as it receives a pressure drop. In this case a zone óbi is provided in the second part 6b of the space adjacent to the sealing elements 9, 13 where the liquid medium has a considerably lower pressure than in the first inner area Bi of the housing 1. Said zone 6bi of the second part 6b of the radial space is via a passage 20 in communication with the second inner area Bg of the housing 1 where the liquid-unifying medium has only a slight overpressure.
    The pressure in zone 6bi is only slightly higher than the pressure in the second inner region B; of the housing 1. The first peripheral annular recess 15 and the first pressure relief rig 1.6 constitute a first pressure relief unit.
    The second pressure relief ring 18 in the second peripheral annular recess 17 on the carrier 12 has a corresponding function as the first pressure relief ring 16 and the first annular recess 15. Thus, even in connection with the second pressure relief ring 18, a narrow passage is created which results in a pressure drop for the liquid medium. Thereby providing a second zone óbg in the second part 6b of the space having a pressure which is higher than in the first zone 6bi but lower than the pressure in the first inner region Bi of the housing 1.
    The second peripheral ring inlet 17 and the second pressure relief ring 18 form a second pressure relief unit. If the liquid medium has a very high pressure in the first inner region Bi, it may be justified with two pressure-relieving units to reduce the pressure in several steps. In most failures, however, a pressure-relieving device is sufficient. The relief rings 18, 18 are pre-mounted in the annular recesses 15, 17 of the carrier 12. They thus form an integral part of the rotatable part Sh of the floor seal 5.
    During operation, the shaft 2 rotates. The vanes 3 receive liquid medium from the second inner area Bg of the housing. The vanes 3 pressurize the liquid medium so that in the first area Bi of the housing it obtains a relatively high overpressure. The liquid medium pushes out from the first area Bi to the channel 4. The high pressure in the first area Bi also acts on the plane seal 5 insofar as the high-pressure liquid medium penetrates into the space 6b between the static inner surface 7 and the peripheral surface of the rotating driver 12. The liquid medium reaches the second pressure relief ring 18 where it provides a pressure reduction in a first step. The liquid medium is then passed through the second zone 61 to the first pressure relief ring 16 where it provides a pressure reduction in a second stage. The liquid-like medium as when the first zone 6b1 thus has a pressure which only marginally exceeds the pressure of the liquid-medium medium 10 in the second inner region Bz. The liquid medium is led from the first zone 6b1 back to the second inner region Bz via the passage 20.
    The rotatable part of the plane seal 5b thus rotates relative to the static part of the plane seal Sa. The sealing surface 13a of the rotatable part Sh thus rotates in contact with the sealing surface 9a of the static part Sa. However, the sealing surfaces 9a, 13a have a surface unit so that they abut very closely against each other. Thus, substantially no liquid medium can be led from the second part 6b of the space to the first part 6a of the space via the sealing surfaces 9a, 13a. The O-ring 11 prevents liquid-containing medium from being passed past the first movably arranged sealing element 9.
    The presence of the relief rings 16, 18 results in the liquid medium in the first zone 6b1 having a relatively low overpressure in relation to the air pressure on the opposite side of the sealing surfaces 9a, 13a, despite the fact that the liquid medium has a large overpressure in the first inner region. Br. The floor seal 5 as above is therefore suitable for use as a seal between different media which show large pressure differences. Since the relief rings 16, 18 are arranged in recesses on a permanent reducer 12 of the floor seal, the floor seal 5 does not require substantially more space than a floor seal without pressure-relieving units.
    The invention is in no way limited to the embodiment described in the drawing but can be varied freely within the scope of the patent law. The housing 1 can, for example, be arranged in an outer region A which consists of an arbitrary medium having a pressure which is lower than in the first inner region Bi.
    权利要求:
    Claims (12)
    [1]
    Floor seal for sealing a radial space (6) between a rotatable shaft (2) and an inner surface (7) defining a through hole in a housing (1), said radial space (6) having a distance from an area (A) located outside the housing (1) to a first internal area (131) in the housing (1) where there is a higher pressure than in the external area (A), the floor seal (5) comprising a static part (Sa) adapted to be attached to said inner surface (7) and comprising a first sealing element (9), and a rotatable member (Sh) adapted to be attached to the shaft (2) and comprising a second sealing element (13) ), said sealing elements (9, 13) being adapted to abut each other in a position so as to divide said radial space (6) into a first part (6a) which is in contact with the outer region (A) and a second part (6b) which is in contact with the first inner area (B), characterized in that the floor seal (5) comprises a pressure plate standing unit (15, 16, 17, 18) adapted to be arranged in the second part (6b) of the radial space and to create there a zone (6b1) in connection with said sealing element (9, 13) where there is a lower pressure than in the first internal area (Bi).
    [2]
    Floor seal according to Claim 1, characterized in that the pressure-relieving unit (1S, 16, 17, 18) is included in the rotatable part (Sh) of the floor seal.
    [3]
    Floor seal according to claim 1 or 2, characterized in that the pressure-relieving unit (ES, 16, 17, 18) comprises a pressure relief ring (16, 18) which is arranged in an annular recess (15, 17) of the floor seal.
    [4]
    Floor seal according to claim 3, characterized in that the pressure relief ring (16) comprises a surface (16c) which is adapted to abut with a pressure against a wall surface (15b) of the annular recess (15) so as to create a passage between said surfaces (1519, 16c) in which a medium obtains a pressure drop.
    [5]
    Floor seal according to Claim 3 or 4, characterized in that the pressure relief ring (16, 18) has a radially outer surface (16a) which is adapted to abut with a pressure against the inner surface (7) which defines the through hole in the housing (1). ) and a radial inner surface (161)) adapted to be located at a slit-shaped distance from a bottom surface (15a) of the radial recess (15). 10 15 20 25 30 10
    [6]
    Floor seal according to one of Claims 3 to 5, characterized in that the pressure relief ring (16, 18) is pre-mounted in the annular recess (1S, 17).
    [7]
    Floor seal according to one of Claims 3 to 7, characterized in that the pressure relief ring (16, 18) is made of a rigid material.
    [8]
    Floor seal according to one of the preceding claims, characterized in that one of the parts of the floor seal (Sa) comprises a movably arranged sealing element (9) and a capercaillie member (10) which is adapted to press the movably arranged sealing element (9) against the sealing element (13) in the remaining part of the floor seal.
    [9]
    Planar seal according to claim 8, characterized in that said part (Sa) of the plant seal comprises a sealing member (11) which prevents leakage in connection with the movably arranged sealing element (9).
    [10]
    Floor seal according to one of the preceding claims, characterized in that one of the parts of the floor seal (Sa) comprises a test material for fastening sealing elements (9) -
    [11]
    11. l. An assembly comprising a housing, a rotatable shaft extending through a through hole of the housing and a radial space between the rotatable shaft and an interior surface defining the through hole in the housing having a distance between an area ( A) located outside the housing (1) and a first internal area (B) of the housing (1) where there is a higher pressure than in said external area (A), characterized in that said radial space comprises a plantarization according to any of the preceding claims.
    [12]
    Assembly according to claim 11, characterized in that it comprises a passage (20) which is adapted to connect said zone (6b1) which is arranged in connection with said sealing element (9, 13) with a second internal area (Bz) in the housing. (1) where there is a lower pressure than in the first interior area (B i).
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    同族专利:
    公开号 | 公开日
    SE537859C2|2015-11-03|
    CN105917152B|2017-11-10|
    CN105917152A|2016-08-31|
    WO2015122829A1|2015-08-20|
    EP3105478A4|2018-01-03|
    EP3105478A1|2016-12-21|
    BR112016013763B1|2021-02-23|
    EP3105478B1|2019-04-24|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE19903067A1|1999-01-27|2000-08-24|Burgmann Dichtungswerk Feodor|Mechanical seal for a CO¶2¶ refrigerant compressor in a motor vehicle|
    JP4030329B2|2002-03-25|2008-01-09|イーグル工業株式会社|Shaft seal device|
    JP4180832B2|2002-04-24|2008-11-12|イーグル工業株式会社|Mechanical seal device|
    AU2003241928A1|2002-05-29|2003-12-12|Nok Corporation|Seal ring|
    CN100564962C|2007-02-15|2009-12-02|浙江工业大学|Variable distribution porous end face mechanical sealing structure|
    SE531210C2|2007-05-07|2009-01-20|Roplan Internat Ab|Mechanical sealing device and pump|
    DE102007050349B4|2007-10-11|2018-06-07|Kaco Gmbh + Co. Kg|Sealing arrangement for the high pressure area|
    CN102333978B|2009-02-26|2014-01-29|洛普兰国际股份公司|A mechanical sealing device|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1450167A|SE537859C2|2014-02-13|2014-02-13|flat seal|SE1450167A| SE537859C2|2014-02-13|2014-02-13|flat seal|
    BR112016013763-9A| BR112016013763B1|2014-02-13|2015-02-09|face seal and housing and passage unit|
    CN201580004543.3A| CN105917152B|2014-02-13|2015-02-09|Face seal|
    PCT/SE2015/050146| WO2015122829A1|2014-02-13|2015-02-09|Face seal|
    EP15749518.5A| EP3105478B1|2014-02-13|2015-02-09|Face seal|
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