• 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:NL1038321A
    申请号:NL1038321
    申请日:2010-10-21
    公开日:2011-04-26
    发明作者:Tobias Metz；Roland Keber
    申请人:Ebm Papst Landshut Gmbh；
    IPC主号:
    专利说明:

    Device for the suction side of a fan.
    Description
    The invention relates to a device which is arranged on the suction side of a fan, in particular a premixing fan, and comprises a gas inlet and a gas outlet, the device being designed as a bend and a venturi tube integrated in the bend.
    The invention is described on the basis of the example of a premixing fan, but also fans without a premixing function are included. For example, in the case of premixing fans for gas burners, air and combustion gas are sucked in by a radial fan, pre-mixed into the blower and blown into the burner as a mixture suitable for combustion. For controlling the mixing ratio, that is the air and gas proportions, valves are used, which can be controlled either electronically or pneumatically. With a pneumatic control, the gas valve is controlled with a pneumatic negative pressure and the gas direct is mixed into the flow of the air drawn in. The amount of per unit time of air drawn in yields a corresponding amount of gas to be mixed. In this connection, it is known to generate the underpressure by means of a venturi tube mounted on the suction side of the premixing fan, whereby a locally higher flow rate and hence an underpressure is obtained by means of a local reduction of the flow cross-section. (Law of Bernoulli)
    Venturi tubes must have a certain length compared to their diameter in order to achieve the necessary underpressure. The ratio between the length and the diemater is referred to as the aspect ratio. With premix fans, the aspect ratio is usually 1: 5 based on the narrowest or approximately 1: 3 on the largest cross-section of the venturi tube. The devices for premixing are mounted on the lateral suction opening of the fan, whereby a considerable construction size in all directions was created in the known structure, which is not desired.
    The object of the invention is therefore to provide a device which improves the known advantages of a pneumatic mixing installation by means of a venturi tube such that the required building space in the height direction is as small as possible.
    This object is solved by the subject of independent claim 1.
    A device for the suction side of a premixing fan with an air or gas inlet and a gas or gas outlet is provided, the device being designed as a bend and a venturi tube integrated in the bend. A bend is understood to be a component shape which deflects the supplied flow in the fan switched off, preferably in the radial direction of the fan wheel.
    Due to such a bend the projection in the height direction, i.e. in the axial direction with respect to the fan rotor, can be kept very small and a compact and material-saving construction unit can be obtained.
    During the flow through the venturi tube, the fluid is accelerated up to the narrow diameter and then slowed down. When the flow is slowed down, the pressure rises, whereby the flow can come off the wall, the so-called release of the boundary layer, which leads to losses. It is therefore known to those skilled in the art that the venturi tube, starting from the narrow cross-section, must not be excessively widened, whereby an opening angle of 10 ° may not be exceeded as the usual value. However, the flow is even optimally positioned along the entire length of the venturi tube responsible for losses.
    Also when applying bends, it is known that the bending of the flow within the bend piece, in particular when the flow comes loose, is responsible for losses. It is therefore necessary to explain the curves in such a way that the least possible losses occur. As a known measure for reducing the risk of releasing the flow, relatively large jets are used for deflection, whereby, however, the dimensions of the bend pieces are considerably increased.
    By integrating the venturi tube in the bend, both the losses of the venturi tube and the bend are spatially brought together and the resulting total loss is reduced.
    In an advantageous embodiment, the venturi tube of the bend in the narrowest area is substantially slot-shaped, wherein the substantially slot extends over the entire width of the venturi tube. Due to the slit-shaped design of the area of the venturi tube with the narrowest cross-section, a substantially release-free flow is guaranteed over the width of the bend, so that the total loss is extremely small.
    In an advantageous embodiment, a supply line and the device and the bend piece, respectively, can be made in one piece, the supply line being substantially tubular and extending at least over the entire width of the bend piece. An opening gap is preferably provided between the supply line and the narrowest cross-section of the venturi tube, or passage holes are provided with a corresponding cross-section, to enable effective admixture of the gas supplied with the supply line. The gas distribution within the supply line is as homogeneous as possible, so that a gas flow that is as constant as possible is guaranteed over the opening slit. The opening gap extends at least half the width of the venturi tube, but preferably substantially over the entire width, to ensure a possible high degree of admixture. With certain types of curves, it may be advantageous to provide a distance between the opening gap and location with the narrowest cross-section of the venturi tube. Such a distance can be no more than 10% of the total length of the device or the bend piece, in order to ensure efficient use of the venturi effect.
    With the device according to the invention it is advantageous that a deflection of the flow of, for example, 30 ° is realized from the air inlet to the air outlet. Depending on the application, however, a deflection with an angle between 30 ° and even 180 ° can also occur. This is made possible by the design of the device as a bend in which the air sucked in is not sucked in axially with respect to the fan rotor, as in the prior art, but is essentially sucked in from the radial direction and only at the suction opening of the fan housing in a axial flow is deflected.
    For a flow within the device or the bend piece that is as loss-free as possible, it can be provided that the flow is already deflected from the air inlet to the area with the narrowest cross-section by at least 15 °, preferably in a flow parallel to the fan outer wall.
    With regard to the geometric shape of the device, it is advantageous that the cross-sections in the area of the air inlet up to the cross-section in the narrowest area of the venturi tube have a height to width ratio of between 1: 1.5 and 1: 2, and is preferably 1: 1.7. Furthermore, it is advantageous if the mixture outlet is formed substantially as a round outlet opening, and a distance between the edge of this outlet opening and the narrowest area of the bend is at most 1.5 times the diameter of the outlet opening diameter. When using a rotor blade as a reference size, the distance between the center of the outlet opening and the area with the narrowest cross-section (B) must be at most 1.5 times the radius of the rotor blade of the applied fan. Longer distances lead to losses that generate losses. Efficient use of the building space is mainly achieved when the venturi tube exceeds the outer diameter of the rotor blades of the fan rotor by less than 20%.
    Furthermore, it is advantageous that the width of the venturi tube in the suction area substantially or precisely corresponds to the diameter of the outlet opening. This ensures that the flow takes place over the entire length of the device, or the bend, and over their joint width, without loss-causing restrictions or constrictions being provided.
    For an optimum gas supply, the supply line can be provided with a flange to which a gas line can be connected. The supply line preferably extends over the entire width of the bend, so as to ensure the admixture of the gas to the air flowing through the venturi tube over the entire width of the bend. In this way a mixture of air and gas that is as homogeneous as possible can be supplied to the fan to the suction opening.
    Further features, advantages and embodiments of the invention form the subject of the following description and the schematic drawing of the exemplary embodiments.
    FIG. 1A is a side view of a cross-section of the device according to the invention on a fan housing,
    FIG. 2 shows a plan view of the device according to the invention on a fan,
    FIG. 3 shows an enlarged view of the device of FIG.
    FIG. 1 shows the device 1 designed as a bend piece, mounted on a fan housing, in which a fan rotor is arranged. The device 1 is essentially twice as wide as high, wherein the height direction is an axial direction of the fan rotor and the width direction is a radial direction of the fan rotor.
    A venturi tube is integrated in the bend 1 shown enlarged in Fig. 3, spaced apart from both the suction opening of the fan and the mixture outlet 3 of the bend. The venturi tube comprises a plurality of flow sections with different cross-sections A, B, C, the cross-section A, C being larger than the narrowest cross-section B of the venturi tube of the bend. The bend 1 is provided with a very flat shape and the area of the narrow-sectioned venturi tube is essentially slit-shaped and extends over the entire width B of the bend 1. The narrowest section B of the bend 1 is obtained because its outer surface is from both sides run down to the substantially right bottom surface.
    On the bend piece 1, in the region of the narrowest section B, a supply line of one piece is formed which extends substantially tubularly over the entire width b of the bend piece 1. The supply line 4 extends as far as the height direction as the usual components of a bend 1, in order to obtain a compact construction unit as possible. An opening gap 5 is provided between the supply line 4 and the flow channel of the bend 1 in the region of the narrowest section B, which gap preferably extends over the entire width b of the devuri tube. In the embodiment shown, the supply line 4 is arranged in such a way on the bend 1 that the opening gap 5 extends exactly along the location of the narrowest cross-section. In alternative embodiments, the opening slit 5 can be provided with a predetermined distance to the location of the narrowest cross-section, but this distance will not exceed 10% of the total length I of the bend 1. With the bend 1 according to the invention, the flow from the air inlet 2 to the mixture outlet 3 is deflected by approximately 120 °, whereby a first deflection from the air inlet 2 to the venturi tube and then a second deflection in the area of the outlet opening 3 of the bend piece is realized.
    In Fig. 2 the device 1 according to the invention is shown in top view in cross section, mounted on a fan. The bend 1 extends over the length I and shows the width b. The air flows in over the entire width b of the air inlet 2 into the bend 1, and is accelerated up to the region of the tightest section B. The supply line 4 is provided with a flange 6 to which a gas line can be connected, in order to mix gas to the sucked-in air via the supply line 4 and the opening gap 5. The mixture outlet 3 is formed as a round outlet opening, for which the distance f between the edge of the outlet opening and the area of the narrowest cross section B is substantially the size of the diameter d of the outlet opening. In an alternative embodiment, the distance f can also be chosen larger, but this value may never be greater than 1.5 times the value of the diameter d of the outlet opening. The width b of the bend 1 is slightly larger than the diameter of the outlet opening d, whereby the difference between b and d is already limited by the material thickness of the bend 1, and b can also be chosen to be equally large.
    The invention is not limited in the embodiment to the exemplary embodiment shown above. On the contrary, a number of variants are possible, which also lie within the scope of the invention. For example, it is possible to shift the feed in the direction of the suction opening or in the direction of the air inlet, as long as the desired admixture of the gas can still be guaranteed. Furthermore, it is possible to direct the air inlet of the bend and to provide only a deflection of the flow in the area of the mixture outlet. In addition to the shown use of an opening gap, it is also possible to provide several openings which guarantee the gas inlet in the flow within the bend.
    权利要求:
    Claims (14)
    [1]
    Device (1) for the suction side of a fan with at least one gas inlet (2) and a gas outlet (3), wherein the device (1) is designed as a bend piece and a venturi tube is integrated in the bend piece.
    [2]
    Device according to claim 1, wherein the venturi tube comprises a plurality of flow sections with different cross-sections (A, B, C), characterized in that the venturi tube of the bend is essentially slot-shaped in the area with the narrowest cross-section (B).
    [3]
    Device according to one of the preceding claims, characterized in that essentially the slot extends over the entire width (b) of the venturi tube in the bend.
    [4]
    Device according to one of the preceding claims, characterized in that a supply line (4) and the device (1) are made in one piece.
    [5]
    Device according to claim 4, characterized in that an opening gap is provided between the supply line (4) and the area with the narrowest cross-section (B) of the venturi tube.
    [6]
    Device according to claim 5, characterized in that the opening slit (5) extends at least over half the width (b) of the venturi tube.
    [7]
    Device according to claim 4 or 5, characterized in that the distance between the opening gap (5) and the location with the narrowest cross-section (B) is at most 10% of the total length (I) of the device.
    [8]
    Device according to one of the preceding claims, characterized in that a deflection of the flow of at least 30 ° is realized from the air inlet (2) to the mixture outlet (3).
    [9]
    Device according to one of the preceding claims, characterized in that the air inlet (2) up to the area with the narrowest cross-section (B) causes a deflection of the flow of at least 15 °.
    [10]
    Device according to one of the preceding claims, characterized in that the cross-sections (A, B) have a height-to-width ratio of between 1: 1.5 and 1: 2.
    [11]
    Device according to any one of the preceding claims, characterized in that the mixture outlet (3) is formed substantially as a round outlet opening and has a distance (f) between the edge of the outlet opening and the area with the narrow section (B) that is at most 1 Is 5 times the value of the diameter (d) of the outlet opening.
    [12]
    Device according to any one of the preceding claims, characterized in that the width (b) of the venturi tube in the suction area substantially corresponds to the diameter (d) of the outlet opening.
    [13]
    Device according to one of the preceding claims, characterized in that the supply line (4) is provided with a flange (6), to which a gas line can be connected.
    [14]
    Device according to one of the preceding claims, characterized in that the supply line extends over the entire width (b) of the venturi tube of the bend.
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    同族专利:
    公开号 | 公开日
    DE102009050562A1|2011-04-28|
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    EP2491308A1|2012-08-29|
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE19540772A1|1995-11-02|1997-05-07|Buderus Heiztechnik Gmbh|Atmospheric gas burner with at least one element containing venturi tube|
    ES2141464T3|1996-10-03|2000-03-16|Siabs Industry S R L|DEVICE TO SUPPLY A GAS-AIR MIXTURE TO BURNERS, PARTICULARLY FOR HEATING APPLIANCES.|
    DE19733769C2|1997-08-05|2003-05-22|Dungs Karl Gmbh & Co|Fuel gas introduction device for a gas premix burner|
    DE10202702B4|2001-01-24|2013-01-10|IfTA Ingenieurbüro für Thermoakustik GmbH|Heater with a housing|
    ES2603421T3|2008-09-16|2017-02-27|Siemens Aktiengesellschaft|Gas burner|US9557059B2|2011-12-15|2017-01-31|Honeywell International Inc|Gas valve with communication link|
    US9851103B2|2011-12-15|2017-12-26|Honeywell International Inc.|Gas valve with overpressure diagnostics|
    US8947242B2|2011-12-15|2015-02-03|Honeywell International Inc.|Gas valve with valve leakage test|
    US8899264B2|2011-12-15|2014-12-02|Honeywell International Inc.|Gas valve with electronic proof of closure system|
    US8905063B2|2011-12-15|2014-12-09|Honeywell International Inc.|Gas valve with fuel rate monitor|
    US9074770B2|2011-12-15|2015-07-07|Honeywell International Inc.|Gas valve with electronic valve proving system|
    US9846440B2|2011-12-15|2017-12-19|Honeywell International Inc.|Valve controller configured to estimate fuel comsumption|
    US9995486B2|2011-12-15|2018-06-12|Honeywell International Inc.|Gas valve with high/low gas pressure detection|
    US9835265B2|2011-12-15|2017-12-05|Honeywell International Inc.|Valve with actuator diagnostics|
    US8839815B2|2011-12-15|2014-09-23|Honeywell International Inc.|Gas valve with electronic cycle counter|
    US10024439B2|2013-12-16|2018-07-17|Honeywell International Inc.|Valve over-travel mechanism|
    US9234661B2|2012-09-15|2016-01-12|Honeywell International Inc.|Burner control system|
    US10422531B2|2012-09-15|2019-09-24|Honeywell International Inc.|System and approach for controlling a combustion chamber|
    EP2868970B1|2013-10-29|2020-04-22|Honeywell Technologies Sarl|Regulating device|
    US9841122B2|2014-09-09|2017-12-12|Honeywell International Inc.|Gas valve with electronic valve proving system|
    US9645584B2|2014-09-17|2017-05-09|Honeywell International Inc.|Gas valve with electronic health monitoring|
    US10503181B2|2016-01-13|2019-12-10|Honeywell International Inc.|Pressure regulator|
    US10564062B2|2016-10-19|2020-02-18|Honeywell International Inc.|Human-machine interface for gas valve|
    US11073281B2|2017-12-29|2021-07-27|Honeywell International Inc.|Closed-loop programming and control of a combustion appliance|
    US10697815B2|2018-06-09|2020-06-30|Honeywell International Inc.|System and methods for mitigating condensation in a sensor module|
    法律状态:
    2021-06-02| MM| Lapsed because of non-payment of the annual fee|Effective date: 20201101 |
    优先权:
    申请号 | 申请日 | 专利标题
    DE102009050562|2009-10-23|
    DE102009050562A|DE102009050562A1|2009-10-23|2009-10-23|Device for the suction side of a blower|
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