• 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:
    A simple mechanical tool that allows the theoretical pressure drop caused by flowing fluid in a pipe to be determined. Tool consisting of a snail-shaped disc (1) positioned on a fixed plate (2). The disc is mounted in such a way that it can rotate about a point (3). One part of the disc is circular (4) while the other part is curved (5). By rotating the dial so that the arrow (6) (7) is placed next to a given flow on the scale (8) it is possible to read the pressure loss for a given pipe dimension (9) on the scale (10)
    公开号:DK201400118A1
    申请号:DK201400118
    申请日:2014-03-04
    公开日:2015-09-21
    发明作者:Simon Skaarup
    申请人:Midtconsult P S；
    IPC主号:
    专利说明:

    Mechanical tool for determining the theoretical pressure drop caused by flowing fluid in a pipe
    The invention relates to a practical tool which in a simple way makes it possible to determine the theoretical pressure drop caused by flowing liquid in a pipe.
    The implement consists of a disc placed on a plate in such a way that it can rotate around a center point.
    The dial, as well as the plate, is provided with text, numbers and curves. By rotating the disc, it is possible to read the corresponding values for media flow, pipe dimension and pressure drop.
    Pressure drop in pipes is usually calculated using Colebrook and White's formula of 1937.
    The solution of the form must be found in iterations and is therefore time-consuming to determine, unless IT is used.
    Alternatively, the pressure loss can be determined by using nomograms that are pre-printed curve sheets, where one can determine the pressure loss by means of a ruler. However, the method is time-consuming to apply in practice.
    In relation to the above methods, the invention offers a fast and intuitive method which can also be used where there is no access to information.
    The instrument is used by first turning the dial so that the arrow on the dial is off the current flow. L / s or rn / h can be used whichever is most convenient in the given situation.
    Subsequently, it is possible to read associated values for pipe dimension and pressure loss along the periphery of the non-circular portion of the disc.
    If the tool is used to determine pressure loss in heating or cooling systems, the flow rate can be determined by first turning the dial so that the current temperature difference accounts for the relevant power.
    In this way, the pressure loss can be determined without first having made flow calculation in another way.
    The tool is based on Colebrook and White's formula, where several factors are predetermined, such as the viscosity of the medium and the inner roughness of the tube.
    Drawing 1 wiper disk
    Drawing 2 shows the plate
    Drawing 3 shows the overall implement
    Drawing 4 shows an example of alternative design
    The implement consists of a disc 1 mounted on a plate 2 in such a way that it can rotate about a center point 3.
    The shape of the disc is composed of two parts, one part of which is circular 4, while the other part 5 is curved and composed of several circular sections with varying radii and different center so that the shape of the disc as a whole appears as the silhouette of a snail housing.
    Two arrows are located at the periphery of the circular portion of the disc. One arrow marked “l / s” 6 and another arrow marked “m3 / h” 7 which when rotating the dial marks along a logarithmic scale on the plate indicating fluid flow 8. The distance between the two arrows means that there is always a factor 3.6 difference in the readings, corresponding to the numerical difference of the units m3 / h and 1 / s. The same scale can therefore be used for reading two different units for flow.
    Along the outer circle the curved portion of the disc is applied a scale of pipe diameters 9 which is read against a series of curves printed on the fixed portion. The curves having varying curvature indicate the relative pressure loss 10.
    The curved portion of the disc crosses the curves of the plate. The intersection of the disc and curves will change as the disc is rotated, enabling a correct reading of the pressure loss to be obtained despite the mathematically irregular nature underlying it. The curvature of the curves is determined by depositing a number of points which are then associated with a soft line.
    The tool also has a logarithmic scale for power 11 and temperature difference 12. If the tool is used in connection with heating or cooling systems with water as medium, by combining power and temperature difference, the necessary fluid flow can be determined by turning the disc to the current power stands out the current temperature difference. The flow is thereby determined from the formula
    Where q is flow, P is power, p is the density of the medium and cp is the specific heat capacity of the medium. In the shown version, the tool is designed for use with pure water at 30 ° C, whereby p cp = approx. 4.18 In heating and cooling systems the size of valves etc. is stated. often by the "Kvs value" of the component, which is an expression of the amount of water in m3 / h that can flow through the valve at 1 bar pressure drop. On the plate, along the circular edge of the disk, is applied a logarithmic scale for Kvs values 12 which can be read against a corresponding logarithmic scale for pressure loss indicated on the disk 13. By first adjusting the rotated position of the disk around the center point, it corresponds to a current flow, it is possible to read the pressure drop in a given component from its Kvs value and the amount of water. The relationship between flow, Kvs value and pressure loss is given by the formula:
    Where qv is flow and Ap is pressure loss.
    Information on the back of the implement can be used to help the user determine the size and type of other components of the respective pipe system.
    The disc and plate can advantageously be made of a thin plastic material, which makes the implement easy to transport and resistant to dirt.
    The tool can also be designed so that scales are applied to the plate behind the disc and read through a cut out "eye" in the disc. It is also possible to incorporate a scale showing the velocity of the medium in the tube as shown in drawing 4.
    权利要求:
    Claims (6)
    [1]
    A mechanical calculation tool for determining the theoretical pressure drop caused by flowing liquid in a tube, comprising a disk (1) fixed to a plate (2) in such a way that the disk can rotate about a center point (3), wherein one or more flow markers (6, 7) and a flow scale (8) are located respectively on the disk and on the plate or vice versa, and a scale with internal pipe diameters (9) and a pressure loss scale (10) are respectively placed on the disk and on the plate or vice versa, so that rotation of the disk to a point where a flow marker designates a particular flow in the flow scale allows reading of associated values of inner tube diameter and pressure loss at this flow from the mutual position between the scale with the inside pipe diameters and the pressure loss scale.
    [2]
    A mechanical calculation tool according to claim 1, wherein the shape of the disc is composed of two parts, one part (4) of which is a semicircle with center at the center of the disc, while the edge of the other part (5) is composed of several circular sections with varying radii and different centers, so that the shape of the disc as a whole looks like the silhouette of a snail housing.
    [3]
    A mechanical calculation tool according to claim 1 or 2, wherein a scale of kvs values (13) and a pressure drop scale (14) is located respectively on the disk and on the plate or vice versa, so that rotation of the disk to a point where a flow marker designates a particular flow in the flow scale, allows the reading of the pressure drop over a component with a given kvs value to be read at this flow from the mutual position between the kvs values scale and the pressure drop scale.
    [4]
    Mechanical calculation tool according to any one of the preceding claims, wherein a power scale (11) and a temperature difference scale (12) are located respectively on the disk and on the plate or vice versa, so that rotation of the disk to a point where related values of power and temperature difference facing each other, allows the corresponding flow to be read from the position of a flow marker relative to the flow scale, associated values of internal pipe diameter and pressure loss at this flow from the mutual position between the internal pipe diameter scale and the pressure loss scale and / or the pressure drop across a component with a given kvs value at this flow from the mutual position between the kvs value scale and the pressure drop scale.
    [5]
    A mechanical calculation tool according to any one of the preceding claims, further comprising scales on the disk and the plate, respectively, for reading the speed of the medium in a tube of a given internal diameter at a given flow.
    [6]
    A mechanical calculation tool according to any one of the preceding claims, wherein one or more of the scales on the plate are positioned behind the disk and can be read through a cut opening in the disk.
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    同族专利:
    公开号 | 公开日
    DK178255B1|2015-10-12|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DK201400118|2014-03-04|
    DK201400118A|DK178255B1|2014-03-04|2014-03-04|Mechanical tool for determining the theoretical pressure drop caused by flowing fluid in a pipe|DK201400118A| DK178255B1|2014-03-04|2014-03-04|Mechanical tool for determining the theoretical pressure drop caused by flowing fluid in a pipe|
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