• 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:
    lO l3 SUMMARY A method is described for feeding a flow on a gas passing a river feeder. The device causes a pressure drop when it is flowed through by the gas. The pressure drop across the device becomes a measured on the gas flow. The device (81) which on the upstream side along the pipe has a river channel which is designed as a gas permeable pipe designed in such a way that the cross-sectional area of the channel decreases downstream of the gas permeable pipe. In this way a minimum volume is obtained in the channel upstream of the pressure drop generating part of the device. To be published with Fig. 8
    公开号:SE1050486A1
    申请号:SE1050486
    申请日:2010-05-17
    公开日:2011-11-18
    发明作者:Goeran Cewers
    申请人:Mindray Medical Sweden Ab；
    IPC主号:
    专利说明:

    15 20 25 30 35 fans. Examples of fan applications can be read in patents US 5,265,594 and SE 529,989.
    U.S. Pat. No. 5,265,594 describes how a flow restrictor through a gas channel upstream of a control valve is used to measure the gas flow.
    Patent SE 529,989 describes how a flow restrictor through a gas channel downstream of a control valve is used to measure the gas flow.
    A significant difference between gases and liquids when measuring flow is that gases are compressible, and liquids almost not at all. This leads to some undesirable effects such as the pressure in the gas duct affecting the flow measurement because a pressure change leads to a compression generated flow which will flow into the space between flow restriction and a control valve which generates or controls a flow based on the flow signal from the flow meter.
    In the event that the flow restrictor is located upstream of the control valve, false flows will be generated during pressure variations in the gas supply to the device. In a fan application, this means that fans on the same gas supply line can interfere with each other.
    In the event that the flow restrictor is located downstream of the control valve, false flows will be generated during pressure variations in the outlet of the device. In a fan application, this means that valves containing several such devices with a common outlet will interfere with each other.
    One way to minimize said undesirable effects of gas compression is to make the volume between flow restrictor and control valve as small as possible, this can be achieved by making the flow restrictor small. However, this is at the expense of the linearity and dynamics of the flow-pressure drop vs the flow, this due to increased turbulence at higher flows.
    An object of the invention is to provide a device with flow restriction which has a relatively large area and a small volume between the flow restrictor of the device and the interface with the control valve.
    Summary of the invention These objects are achieved by means of the device and the method according to the appended independent claims, wherein particular embodiments are dealt with in the dependent claims.
    The present invention thus seeks in particular to counteract, improve or eliminate one or more of the above-identified shortcomings and disadvantages in conventional technology, individually or in any combination, and at least partially solves the above-mentioned problems by providing an equipment according to the appended claims.
    A method is described for measuring a flow on a gas passing through a flow meter device. The device causes a pressure drop when it is flowed through by the gas. The pressure drop across the device becomes a measure of the gas flow. The device is designed as a gas-permeable pipe which on the upstream side along the pipe has a flow channel which is designed in such a way that the cross-sectional area of the channel decreases downstream of the gas-permeable pipe. A small volume is provided by adapting the flow channel and flow restriction of the device to the geometry of the flow profile of effluent gas from the flow valve. In this way a minimal volume is obtained in the channel upstream of the pressure drop generating part of the device.
    In some embodiments, the outlet of a gas valve is centered, and the profile of the outlet flow has the appearance of a single cone. In other cases, the outlet is coaxial with a flow profile that can be described as a pipe.
    By designing the geometry of the device according to embodiments of the invention for the said flow profiles, it is possible to make a flow restrictor for each of the mentioned valve types.
    According to a first aspect of the invention, there is provided a flow meter element comprising a tubular element and a flow restrictor disposed therein. The tube element may be comprised of a coupling interface to a flow valve. The flow restrictor comprises a closed fluid-permeable body so that a fluid-permeable tube is formed which on the upstream side along the tube has a flow channel which is designed in such a way that the cross-sectional area of the channel decreases downstream of the tube.
    In one embodiment, the tube element is an outer tube.
    The outer tube and the fluid-permeable body are arranged relative to each other with a distance which decreases in the longitudinal direction of the flow meter element between the inner side of the outer tube and the fluid-permeable body.
    By adapting the flow channel of the flow meter element and the flow restrictor to the geometry of the flow profile from an outflowing fluid from a flow valve, a relatively large surface area of the flow restrictor can be achieved and at the same time a small volume between the flow restrictor and a valve. Whereby an increased interface (outer-tube) pressure is created upstream before the flow resistor, for example by compression of a gas when the flow resistance increases, and a pressure drop downstream of the flow resistor. The differential of the pressure is proportional to the flow in the channel, whereby the flow can be measured.
    In a particular embodiment of the flow meter element, the closed fluid permeable body is a cone.
    One way of creating the above construction is for the fluid permeable body to have a conical shape either downstream or upstream.
    In a particular embodiment of the flow meter element, the closed fluid permeable body is a partial cone.
    One way of creating the above construction is that the fluid permeable body has a partial-conical shape using either downstream or upstream.
    The cross-sections of the tube geometries on the outer tube and the fluid-permeable tube may be slightly circular and / or polygonal and / or elliptical.
    In certain embodiments of the invention, the flow meter element includes a differential pressure gauge connected to each side of the fluid permeable body.
    The differential pressure gauge here measures the differential pressure on both sides of the fluid-permeable body, which is then used to calculate the flow.
    Some embodiments of the invention include the flow meter element, a flow valve connected to a first connection interface to the flow meter element.
    Certain embodiments of the invention include that the flow meter element has a second coupling interface identical to the coupling interface of the flow valve.
    Because the flow meter element has a mechanical coupling interface adapted to a connected flow valve and the flow meter element has a second coupling interface identical to the flow valve, the device can be connected to a link with an already existing construction.
    In a second aspect, the invention comprises a method of flow measurement comprising a flow restrictor with a relatively large surface area and a relatively small volume between the flow restrictor body, located in the flow channel, fluid permeable body and the outer tube of the coupling interface; where the relatively small volume is produced by arranging the outer tube and the fluid-permeable body relative to each other with a distance which decreases in the longitudinal direction of the flow meter element between the inner side of the outer tube and the fluid-permeable body, whereby (P1) and a pressure drop the fluid permeable body generated upstream (P2) whose difference is proportional to the flow. According to a further aspect of the invention there is provided a method of measuring a flow comprising measuring a flow on a fluid passing a flow meter device wherein the device causes a pressure drop as it flows through the fluid and where the pressure drop across the device is a measure of fluid flow .
    The method comprises providing a device designed as a fluid permeable tube which on the upstream side along the tube has a flow channel which is designed in such a way that the cross-sectional area of the channel decreases downstream of the fluid permeable tube, whereby the method comprises providing a minimum volume in the channel upstream of the pressure drop generating part of the device.
    The advantages of this method are, as for the equipment described above, that one can easily measure the flow in a flow channel or out of a valve without the occurrence of false flows which affect the flow measurements. General Description of the Drawings These and other aspects, features and advantages of the invention are at least partially apparent and specified by the following description of embodiments of the present invention, taken in conjunction with the accompanying figures, in which Figure 1 shows in a schematic view an exemplary embodiment for a flow valve with peripheral circular outlet upstream; Figure 2 shows in a schematic view a further exemplary embodiment suitable for a flow valve with a peripheral circular outlet upstream; Figure 3 shows in a schematic view an embodiment suitable for a flow valve downstream with a peripheral circular inlet; Figure 4 shows in a schematic view a further exemplary embodiment suitable for a flow valve downstream with a peripheral circular inlet; Figure 5 shows in a schematic view an embodiment suitable for a flow valve with centered outlet upstream; Figure 6 shows in a schematic view an embodiment suitable for a flow valve downstream with centered inlet; Figure 7 shows in a schematic view an exemplary embodiment suitable for a flow valve upstream with a peripheral circular outlet; and Figure 15 shows in a schematic view an exemplary embodiment with a flow valve upstream with a peripheral circular outlet.
    Description of embodiments An exemplary embodiment of a device according to the invention is obtained according to Fig. 1 in that a gas flow from a flow valve flows on the inside of a pipe 10 and passes downstream through a gas-permeable partial cone 11.
    The design of the cone 11 means that the cross-sectional area of the flow channel gradually decreases downstream of the cone 11. In this way the turbulence and also the volume between the cone 11 and the inlet upstream of the pipe 10 is minimized.
    Upstream of the cone, a pressure P1 builds up which is dependent on the flow. Downstream of the cone, the pressure P2 is measured. The difference P2-P1 gives a measure of the flow.
    Thanks to minimal turbulence and the minimal volume between the cone 11 and the inlet upstream of the pipe 10, an advantageous flow measurement is obtained. The flow measurement is largely a fast and reliable regulation of a gas flow with a flow valve independent of pressure variations in the flow channel. can be obtained from the signal for the differential pressure P2-P1.
    The device as shown in Fig. 1 is suitable for a flow valve with a peripheral circular outlet upstream.
    The flow valve can for example be attached to the flow meter by means of a suitable flange (not shown) or by means of grooves which receive seals, see for example Fig. 8.
    In some embodiments of flow meter systems, in addition to the differential pressure P2-P1, additional parameters such as gas temperature, outlet pressure P2, gas viscosity and gas density are measured. A linearization with regard to these parameters can take place. Thus, a very accurate calculation of the flow can be made.
    Figure 2 shows in a schematic view a further exemplary embodiment suitable for a flow valve with a peripheral circular outlet upstream. In this embodiment, the gas permeable element 21 is of cylindrical shape with a closed end upstream. The cross-sectional area of the flow channel gradually decreases downstream due to an insert 22 gradually decreasing the cross-sectional area of the flow channel up to the point of attachment of the cylindrical gas-permeable element 21.
    In other embodiments, a conical gas-permeable element can also be combined with a conical insert, see 5 and Fig. 6.
    The tube and the insert can be designed in an integral, for example, Fig. Piece.
    Figure 3 shows in a schematic view an embodiment suitable for a flow valve downstream with a peripheral circular inlet. A conical gas-permeable element 31 is arranged in a tube 30. Here too, the distance in the longitudinal direction of the flow meter element between the inside of the outer tube and the fluid-permeable body changes.
    Figure 4 shows in a schematic view a further exemplary embodiment suitable for a flow valve downstream with a peripheral circular inlet. In this embodiment, a gas permeable member 41 is of cylindrical shape with a closed end downstream. Here, too, the distance in the longitudinal direction of the flow meter element between the inside of the outer tube and the fluid-permeable body changes.
    Figure 5 shows in a schematic view an embodiment suitable for a flow valve with a centered outlet upstream. A conical gas-permeable element 51 is combined with a conical insert 52, however, the pitch of the two elements differs from each other. The conical gas-permeable element 51 has a larger pitch than the conical insert 52. In this way a very small volume is achieved between the flow restrictor of the device and the interface with a control valve.
    Figure 6 shows in a schematic view an embodiment suitable for a flow valve downstream with a centered inlet. A conical gas-permeable element 61 is combined with a conical insert 62, however, the pitch of the two elements differs from each other. The conical gas permeable element 61 has a smaller pitch than the conical insert 62. In this way a very small volume is achieved between the flow restrictor of the device and the interface to a control valve.
    Figure 7 shows in a schematic view an embodiment suitable for a river valve upstream with a peripheral circular outlet. A conical gas permeable element 71 is combined with a cylindrical insert. Here, too, the distance in the longitudinal direction of the flow meter element between the inside of the outer tube and the fluid permeable body changes so that a very small volume between the flow restrictor of the device and the interface to a control valve.
    Figure 8 shows an exemplary embodiment in which a valve 200 with a central inlet and a coaxial outlet is connected to the device. The device according to this figure has a mechanical interface to the valve which matches the device interface at the bottom of the valve interface. the figure is identical to the valve interface. In this way, the device can be connected as a link in an existing construction. The differential pressure sensor 201 has ports on each side of a cone 81 of gas permeable material. Using the output signal on this sensor, the gas flow can be calculated.
    In the present exemplary embodiment, the constituent parts are circular, however, the geometry of the device is not limited to these shapes, but the circular shape can be changed with polygons, ellipses or combinations thereof.
    权利要求:
    Claims (1)
    [1]
    A flow feeder element comprising a tube element and a flow restrictor arranged therein, wherein the tube element may be comprised of a coupling interface to a flow valve, the flow restrictor comprising a closed fluid permeable body so that a fluid permeable tube is formed on the longitudinal tube. has a flow channel which is designed in such a way that the cross-sectional area of the channel decreases downstream of the pipe. The flow feeder element according to claim 1, wherein the tube element is an outer tube; wherein the outer tube and the fluid-permeable body are arranged relative to each other with a distance which decreases in the longitudinal direction of the flow meter element between the inner side of the outer tube and the fluid-permeable body. The flow meter element according to claim 1 or 2, wherein the fluid permeable body is formed as a closed tube on one end. The flow meter element according to claim 3, wherein the flow channel downstream towards the closed pipe has a gradually decreasing cross-sectional area. The flow feeder element according to claims 1 to 3, characterized in that the flow channel upstream of the closed pipe has a successively decreasing cross-sectional area. The flow meter element of claim 3, wherein the closed fluid permeable body is a cone. 10 15 20 25 30 35 10 11 12 13. 14 11 The flow meter element according to any one of claims 1-6, wherein the pipe element comprises an insert element which conically changes the river channel. The flow meter element of claim 3, wherein the closed fluid permeable body is a partial cone. The flow meter element according to any one of claims 1-8, comprising that the cross section of the pipe geometries is circular, polygonal, or elliptical. The flow meter element according to claims 1-8, comprising that the cross section of the rudder geometries is a combination of circular shape and / or ellipse and / or polygon. The flowmeter element according to claims 1-10, which comprises a differential pressure gauge one connected to each side of the fluid permeable body and arranged to measure a differential pressure at a flow over the fluid permeable body. The river meter element according to claims 1-11, which comprises a river valve which is connected to a first coupling interface to the river meter element. The flow meter element according to claim 12, which comprises that the flow meter element has a second coupling interface identical to the coupling interface of the flow valve. Flowmeter elements comprising a flow restrictor with a relatively large surface area and a relatively small volume between the fluid permeable body of the flow restrictor located in the flow channel and the outer tube of the coupling interface; where the relatively small volume is produced by arranging the outer tube and the fluid-permeable body relative to each other with a distance which decreases in the longitudinal direction of the flow meter element between the inner side of the outer tube and the fluid-permeable body thereby increasing pressure upstream (P1) and a pressure drop downstream (P2) the fluid permeable body and whose difference is proportional to the flow. A method of measuring a flow comprising measuring a flow on a fluid passing a flow meter device, the device causing a pressure drop as it flows through the fluid and the pressure drop across the device being a measure of the fluid flow, the method comprising providing a device which is formed as a fluid permeable tube having on the upstream side along the tube a flow channel designed in such a way that the cross-sectional area of the channel decreases downstream of the fluid permeable tube, whereby the method comprises providing a minimum volume in the channel upstream of the pressure drop generating part of the device. The method of claim 15, comprising measuring the differential pressure, gas temperature, outlet pressure, gas viscosity and gas density, and using the obtained measurement data to determine the flow.
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    引用文献:
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    BR112019004125A2|2016-09-03|2019-05-28|Cipla Ltd|device for measuring a patient's respiratory parameters|
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