• 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 invention relates to a flow rate limiting device (1) having a spring-loaded valve body (4) which is arranged axially displaceable between a first and a second position upstream of a cross-sectional constriction (6) in a flow channel (3), wherein the valve body (4) by a spring (9) is loaded in the direction of the first position, and wherein the flow at a given pressure gradient in the first position is greater than in the second position, wherein the cross-sectional constriction (6) by at least one bypass line (7) is bypassed, wherein the bypass line (7) branches off from the flow channel (3) upstream of the cross-sectional constriction (6) and opens into the flow channel (3) downstream of the cross-sectional constriction (6). In order to achieve a low flow resistance in the open state and a sudden switching, it is provided that in the second position, a defined gap between the valve body (4) and the housing (2) remains.
    公开号:AT510989A1
    申请号:T144/2011
    申请日:2011-02-03
    公开日:2012-08-15
    发明作者:
    申请人:Avl List Gmbh；
    IPC主号:
    专利说明:

    - 1 - 56141
    The invention relates to a flow rate limiting device with a spring-loaded valve body, which is arranged between a first and a second position axially displaceable upstream of a cross-sectional constriction in a flow channel, wherein the valve body is loaded by a spring in the direction of the first pitch, and wherein the flow at a given pressure gradient is greater in the first position than in the second position.
    From EP 0 969 233 A1 a flow restrictor with a spring-loaded valve body is known, wherein the spring-loaded valve body is arranged in a constriction of the flow channel. The nozzle-like shape of the wall of the housing in this case has longitudinal ribs, which form flow channels in the closed state of the valve body, through which a limited flow in the closed position of the valve body is possible.
    The disadvantage is that such flow restrictor in the open state have relatively high pressure losses. Furthermore, it is disadvantageous that known flow restrictors switch from the first position to the second position only at relatively high differential pressures. The switching point is therefore only at a relatively high differential pressure level.
    Another disadvantage is that known flow restrictor has a relatively strong hysteresis, so that the opening of the valve body is greatly delayed from the closed position.
    The object of the invention is to avoid these disadvantages and to provide a flow restrictor with low pressure drop in the open state and with low-delay response.
    According to the invention this is achieved in that the cross-sectional constriction is bypassed by at least one bypass line, wherein the bypass line branches off upstream of the cross-sectional constriction from the flow channel and opens downstream of the cross-sectional constriction in the flow channel, wherein preferably the bypass line outside the flow channel in a housing of the flow rate limiting device is arranged.
    In order to enable a rapid opening from the second position, it is advantageous if the valve body is guided by a fixed axial guide rod, wherein the guide rod downstream of the valve body may have a preferably adjustable stop on which the valve body rests in the second position. The stop may for example be formed by a sleeve which is arranged axially adjustable on the guide rod - 2 - is. The Hüise can at the same time also form the counter bearing for the spring. By the sleeve thus on the one hand, the spring preload and on the other hand, the stop for the valve body can be adjusted axially.
    Upon reaching the defined flow, the flow limiting device according to the invention switches abruptly and independently, without any intervention or actuators from the outside, the switching forces are applied for valve actuation exclusively from fluidic effects.
    The defined stop in the region of the guide rod prevents the valve body from abutting the housing in its second position. In the second position thus remains a defined gap between the valve body and an inner circumferential surface of the housing, whereby a very rapid opening of the valve body from the second position out is possible. The inner circumferential surface of the housing, which tapers in the flow direction, can be designed to be conical or nozzle-like.
    Particularly low flow losses can be achieved if the valve body has a biconical shape. Alternatively, another aerodynamic shape for the valve body can be selected. For example, it can be provided that the rotationally symmetrical valve body has a non-linear curve as a generator. As a result, particularly low pressure losses can be achieved with the flow-limiting device according to the invention in the opened state.
    In a particularly preferred embodiment, it is provided that the switching point between the first and the second position is set to a differential pressure between a region of the flow channel upstream of the flow-limiting device and a region of the flow channel downstream of the flow-limiting device of a maximum of 500 mbar, preferably a maximum of 200 mbar. This results in a very sensitive and low-delay response. In comparison, known flow restricting device usually switch only at a pressure difference of about 1000 mbar.
    The switching point is determined essentially by the aerodynamic shape of the valve body and the surrounding housing and by the interpretation of the spring force. The switching forces are applied purely from fluidic effects. In order to allow low pressure losses, the switching force must be increased via these fluidic effects. The inventive design of the flow-limiting device - 3 - the switching point can be realized at extremely low pressure difference and completely without Aktu-atorik.
    The invention will be explained in more detail below with reference to FIGS.
    1 shows a flow rate limiting device according to the invention in a longitudinal section, and FIG. 2 shows a pressure loss mass flow diagram.
    The flow rate limiting device 1 shown in FIG. 1 has a housing 2 with a flow channel 3, in which a valve body 4 is arranged on a fixed guide rod 5 axially displaceable in the region of a nozzle-like cross-sectional constriction 6.
    The Ventiikörper 4 and the cross-sectional constriction 6 are bypassed by a bypass line 7, wherein the bypass line 7 upstream of the valve body 4 branches off from the flow channel 3 and opens downstream of the cross-sectional constriction 6 in the flow channel 3 again.
    The guide rod 5 has a sleeve 8, on which a spring 9 is mounted, which biases the valve body 4 in a first position shown in FIG. Reference numeral 10 denotes a fastening nut for the guide rod 5.
    The valve body 4 is formed substantially doppelkonisch, whereby the lowest possible flow losses occur.
    The sleeve 8 forms a stop 11 for the valve body 4, wherein the valve body 4 rests in the second position on the stop 11. The stop 11 is adjusted via the sleeve 8 so that in the second position of the valve body 4, a defined gap between the conical lateral surface 4a of the valve body 4 and a conical lateral surface 2a of the housing 2 remains. This gap allows a rapid opening of the valve body 4 from the second position, so that the hysteresis can be kept as small as possible. The remaining gap can have a non-constant thickness by appropriate shaping of the lateral surface 4a of the valve body 4 and the lateral surface 2a of the housing 2.
    In the first position of the valve body 4 shown in Fig. 1, a large amount of the flow medium flows past the valve body 4, a smaller amount passes through the bypass line 7. From a defined by the spring 9 differential pressure .DELTA.ρ the Ventiikörper 4 abruptly from the first position in shifted the second position, whereby the flow channel 3 is closed except for a small remaining gap between the lateral surfaces 4a and 2a. - 4 -
    Bypassing the valve body 4, the flow medium now flows for the most part in the bypass line 7 and flows into the flow channel 3 again downstream of the cross-sectional constriction 6.
    In Fig. 2, the differential pressure Δρ is plotted against the volume flow V. With reference numeral 12, the closing point of the valve body 4, denoted by reference numeral 13, the opening point of the valve body 4. Until the closing point, the device has a relatively low flow resistance. This is abruptly increased by the switching process, which causes the desired flow limitation. The switching point is about 20 to 200 mbar differential pressure between the upstream and the downstream region of the flow channel. 3
    As can be seen, the opening and closing characteristic of the valve body 4 is hysteresis. The hysteresis between the closing and opening of the valve body 4 is indicated by reference numeral 14. Due to the defined gap in the second position of the valve body 4 and the bypass channel 7, the hysteresis behavior 14 can be kept as small as possible. Due to the defined Spait is also in " closed " Valve body 4 a low flow possible.
    权利要求:
    Claims (12)
    [1]
    • * * ♦ «« · * * * * * * t * * * * + • ··· * * * • * * * * * * * * * * * 4 <- »« «4« - 5 Claims 1. A flow rate limiting device (1) comprising a spring-loaded valve body (4) axially displaceable between first and second positions upstream of a cross-sectional constriction (6) in a flow channel (3), said valve body (4) being spring-loaded (9) is loaded in the direction of the first position, and wherein the flow at a given pressure gradient in the first position is greater than in the second position, characterized in that the cross-sectional constriction (6) by at least one bypass line (7) is bypassed, wherein the bypass line (7) branches off from the flow channel (3) upstream of the cross-sectional constriction (6) and opens into the flow channel (3) downstream of the cross-sectional constriction (6).
    [2]
    Second flow rate limiting device (1) according to claim 1, characterized in that the bypass line (7) outside the flow channel (3) in a housing (2) of the flow rate limiting device (1) is arranged.
    [3]
    3. flow rate limiting device (1) according to claim 1 or 2, characterized in that the valve body (4) by a fixed axial guide rod (5) is guided, wherein preferably the guide rod (5) downstream of the valve body (4) has a stop (11) has, on which the valve body (4) rests in the second position.
    [4]
    4. flow rate limiting device (1) according to claim 3, characterized in that the stop (11) by a with the guide rod (5) connected sleeve (8) is formed.
    [5]
    5. flow rate limiting device (1) according to claim 3 or 4, characterized in that the sleeve (5) forms an abutment for the spring (9).
    [6]
    6. flow rate limiting device (1) according to one of claims 3 to 5, characterized in that the stop (11) is adjustable, wherein preferably the stop (11) by the length of the sleeve (5) is defined.
    [7]
    7. flow rate limiting device (1) according to one of claims 1 to 6, characterized in that in the second position, a defined gap between the valve body (4) and the housing (2) remains.
    [8]
    8. flow rate limiting device (1) according to one of claims 1 to 7, characterized in that the housing (2) at least one valve body (4) at least partially surrounding the conical lateral surface (2a).
    [9]
    9. flow rate limiting device (1) according to one of claims 1 to 8, characterized in that the valve body (4) has a biconical shape.
    [10]
    10. flow rate limiting device (1) according to one of claims 1 to 9, characterized in that the substantially rotationally symmetrical valve body (4) has a lateral surface (4a) with a non-linear curve as a generator.
    [11]
    11. flow rate limiting device (1) according to one of claims 1 to 10, characterized in that the housing (2) at least one valve body (4) at least partially surrounding rotationally symmetrical lateral surface (2a) having a non-linear curve as a generator.
    [12]
    12. flow rate limiting device (1) according to one of claims 1 to 11, characterized in that the switching point between the first and second position to a differential pressure between a region of the flow channel (3) upstream of the flow-limiting device (1) and a portion of the flow channel (3) downstream of the flow-limiting device (1) of a maximum of 500 mbar, preferably a maximum of 200 mbar is set, 2011 02 03 Fu / St

    Tel; (+ Λ3 1! BM tjf) 33-0 Fw: (+43 1} 892 89 m

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    同族专利:
    公开号 | 公开日
    DE112012000672A5|2014-01-02|
    WO2012104381A1|2012-08-09|
    AT510989B1|2012-11-15|
    DE112012000672B4|2018-10-11|
    US20140014200A1|2014-01-16|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    AU470376B2|1972-11-22|1976-03-11|Jamec Tools Pty. Ltd.|Improved valve|
    NL8602008A|1986-08-06|1988-03-01|Grontmij N V|Valve assembly for limiting flow through liq. pipe - has valve member with grooved surface, central venturi passage and peripheral channel moved by flow pressure in housing against spring|
    US1683720A|1925-12-24|1928-09-11|David L A Larsonneur|Governor for internal-combustion engines|
    US2749937A|1952-10-14|1956-06-12|Otis Eng Co|Excess flow valve|
    GB762219A|1953-07-17|1956-11-28|Otis Eng Co|Improvements in or relating to pressure responsive valve|
    US3085589A|1960-06-06|1963-04-16|Asa D Sands|Safety valve|
    US3122162A|1963-06-20|1964-02-25|Asa D Sands|Flow control device|
    US3683957A|1970-09-29|1972-08-15|Asa D Sands|Safety valve|
    SE370111B|1972-11-29|1974-09-30|K Oehrn|
    US4699166A|1981-07-21|1987-10-13|Harold Gold|Hydraulic fuse valve assembly|
    JPH0215749B2|1981-08-19|1990-04-13|Obara Kiki Kogyo Kk|
    US5004008A|1990-04-02|1991-04-02|Carrier Corporation|Variable area refrigerant expansion device|
    YU48550B|1990-07-06|1998-11-05|Pipelife Rohrsysteme Gesellschaft M.B.H.|Safety shut-off device for gas pipelines comprising valve|
    US5474105A|1994-03-31|1995-12-12|The Aro Corporation|Overrun control device|
    NL1011596C1|1998-06-30|2000-01-04|Watts Ocean B V|Flow limiter.|
    US6920895B2|2001-04-16|2005-07-26|Alan Avis|Combination surge supression and safety shut-off valve|
    US20090107563A1|2005-09-06|2009-04-30|Donald Gary Eichler|Safety valve having piston with modified orifice|CN103711966A|2013-12-14|2014-04-09|中国航空工业集团公司沈阳发动机设计研究所|Automatically-adjustable flow control valve structure|
    DE102015117072A1|2015-10-07|2017-04-13|M-Tec Mathis Technik Gmbh|Conveying device and method for conveying a medium stored in a silo|
    DE202017100042U1|2017-01-06|2018-04-13|Hebmüller SRS Technik GmbH|check valve|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA144/2011A|AT510989B1|2011-02-03|2011-02-03|FLOW CONTROL DEVICE|ATA144/2011A| AT510989B1|2011-02-03|2011-02-03|FLOW CONTROL DEVICE|
    PCT/EP2012/051778| WO2012104381A1|2011-02-03|2012-02-02|Throughflow rate limiting device|
    DE112012000672.0T| DE112012000672B4|2011-02-03|2012-02-02|Flow rate limiter|
    US13/983,560| US20140014200A1|2011-02-03|2012-02-02|Throughflow rate limiting device|
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