• 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:
    This invention relates to instrumentation, in particular, to means for measuring the flow rate of liquids and gases in the chemical and pharmaceutical industries for measuring consumption of liquid fuel by vehicles. The purpose of the invention is to improve the measurement accuracy. The measured flow of fluid flowing through the tangential input is directed into the cylindrical measuring chamber 1. In this case, it forms the main flow in the form of a helix directed to its axial output. Due to the entrainment of the flow particles, a secondary flow is generated in the lower part of the chamber, rotating at an angular velocity depending on the flow rate of the flowing flow. Due to these flows, the turbine 3 rotates at a frequency proportional to the magnitude of the measured flow. In the presence of a directional elekkka k, the direction of the main flow is maintained with the irq regardless of the change in the flow rate of 5 sludge. % ate 35; oeo 35 Ј 35 srig1
    公开号:SU1698646A1
    申请号:SU857774013
    申请日:1985-11-05
    公开日:1991-12-15
    发明作者:Димитър Тодоров Тодоров；Славчо Георгиев Джуджев；Кирил Димитров Яръмов
    申请人:Вмеи "Ленин" (Инопредприятие)；
    IPC主号:
    专利说明:

    The invention relates to instrumentation, in particular, to means for measuring the flow rate of liquids and gases in the chemical and pharmaceutical industries, mainly in measuring the flow rate of liquid fuel by vehicles.
    Known fluid flow converter in US patent No. 4011757 Cl. G 01 F 1/06, 1977 containing a damper for pulsations of the fluid flow, made of inlet and outlet chambers separated by an elastic (flexible) membrane with a solid center. In this case, the inlet chamber is hydraulically connected to the tangential inlet of the cylindrical measuring chamber, and the outlet chamber is connected to its axial outlet. In the initial position, the flexible membrane is pressed with a helical spring to the end of the converter inlet, so that it is partially closed. By means of the pulsation damper, the pulsations of the incoming liquid are smoothed into the cylindrical measuring chamber of the transducer,
    A disadvantage of the transducer is the inadequate accuracy of the flow measurement.
    The purpose of the invention is to improve the measurement accuracy.
    Fig. 1 shows a cylindrical measuring chamber of a flow converter with a turbine and a guiding element, a partial axial section, fig. 2 is a section A-A in FIG. Fig. 3 is a liquid flow transducer, longitudinal section is B - B in Fig. 3 (through the tangential input of the cylindrical measuring chamber); in Fig. 5, the relative error () in the Function of the flow rate (Q) in the absence of a guiding element. (curve I) and in the presence of a guide element (curve II). The fluid flow converter contains a cylindrical measuring chamber 1 of a transducer with a tangential inlet 101 and an axial output 102. In a cylindrical measuring chamber 1 on axis 2 a turbine 3 is installed, having two straight vanes 31 and 32. Above the turbine 3 in a cylindrical measuring chamber 1 a guide Element986464
    ment 4, composed of lower 41 and upper 42 bases, connected by a screw surface 43. Lower transverse base 41 (Fig. 2) has the shape of a circular sector that covers part of the cross section of the measuring cylindrical chamber 1 and forms a channel 106 in it. 42 (Fig. 1) is a circular sector opposite the channel 106. The guide element 4 is fixed in a cylindrical measuring chamber.
    15 so that the beginning of the screw portion 43 is above its tangential entry 101. A cylindrical measuring chamber 1 made of infrared-transparent
    20 of the material, it has a SW case (FIG. 3). Located with the base 5 of the external converter case so that between them a channel 51 is formed. Between the base 5 and the cylindrical
    25, a flexible membrane 6 is mounted by the housing 103, separating the inlet 7 and the outlet 8 of the chamber of the transducer damper. In the housing 103 from the side of the flexible membrane 6 are formed two
    30 semi-chambers 104 and 105, which are part of the entrance chamber 7. A hole 1041 is made on the outer wall of the half-chamber 104, and on the outer wall of the semi-chamber 105
    but a compensation hole 1051,
    located opposite the tangential inlet 101 of the cylindrical measuring chamber 1. A 9 board is installed on the cylindrical case 1 03.
    to which the emitter and the photodetector of the photoelectric converter 10 (Fig. 4) of the rotation frequency are attached opposite one another. Board 9 (fig.Z) together with cylindrical
    the housing 103 is pressed against the base 5 by a cover 11, in which grooves 111 and RLL are made In the base 5 between the axial output 102 of the measuring chamber 1 and the output chamber
    8 damper is installed hydraulic throttle 52. The input chamber 7 and the annular space 51 are connected to the outlet of the converter (Fig „4), and the output
    chamber 8 - with an outlet 13. The flow converter works as follows
    The measured flow coming through tangential input 101 (Fig. 1)
    and to its axial exit. Due to its high measuring range 10
    15
    the liquid is directed into the cylindrical measuring chamber 1. In this case, it forms the main flow in the form of a helix, directed
    lectures of flow particles in the lower part of the chamber, a secondary flow is formed, rotating at an angular velocity depending on the flow rate of the flowing flow. Due to these streams, the turbine 3 of the flow converter is rotated at a frequency that is a function of the measured flow rate. Due to significant differences in the direction of the main flow in the region of small and large flow rates as a result of centrifugal and centripetal effects at axial or tangential output without a guiding element, this Function is non-linear (Fig. 5, l). In the presence of the guiding element k (Fig. 1), the direction of the main flow is kept constant regardless of the change in flow. Thus, with small measured flow rates, due to the helical surface 3 and the presence of the lower transverse base 1, the main fluid flow is forced to move along a helical line and infuse the turbine 3. Thus, the main flow is always in interaction with one of the two vanes 31 and the tour 8 optimum flow direction in the measuring chamber the converter has a higher accuracy
    20
    neither
    When measuring the flow rate of a pulsating flow created by, for example, a membrane of a fuel pump of a carburetor internal combustion engine, the action of the converter is as follows.
    An abrupt increase in the pressure of the fluid entering the inlet 12 of the converter causes the flexible membrane 6 to deform and is transferred to the outlet 13 of the converter. Due to the resistance of the hydraulic throttle village 52, as well as the total hydraulic resistance of the measuring chamber 1 and the connecting channels 111 and 112 (Fig. 3), the velocity of the fluid through the cylindrical measuring chamber 1 increases much more slowly. Thus, before the flow rate through the measuring chamber 1 rises to not 30 permissible large values, which can lead to a dynamic error, the pressure is equalized between the inlet 1 and the outlet 13 of the converter. With the following abrupt decrease in pressure at the inlet 12 of the converter, the flexible membrane 6, due to its elasticity, returns to its equilibrium state, creating a pressure drop in a similar way to compensate.
    bins, which ensures its uniform rotation.
    When the measured flow rate increases due to the increased difference in fluid pressure over the guiding element k (Fig. 1) and under it, due to the shape of its transverse bases +1 and k2, conditions are created to correct the rotational motion of the main flow in axial outlet 102 than the effects of the centrifugal and centripetal effects are compensated. Thus, with the optimal arrangement of the guide element in the cylindrical measuring chamber 1, a linear dependence of the rotation frequency of the turbine 3 on the measured fluid flow is achieved. This frequency is converted into a pulsed electrical signal by the photoelectric converter 10 (Fig. 4) when the light flux crosses the blades 31 and 32 of the turbine 3.
    16986 66
    8 as a result of ensuring optimum flow direction in the measuring chamber, the converter has a higher accuracy
    five
    five
    0
    neither
    When measuring the flow rate of a pulsating flow created, for example, by the membrane of a fuel pump of a carburetor internal combustion engine, the effect of the converter is as follows.
    An abrupt increase in pressure of the fluid entering the inlet 12 of the converter causes the flexible membrane 6 to deform and is transferred to the outlet 13 of the converter. Due to the resistance of the hydraulic throttle 52, as well as the total hydraulic resistance of the measuring chamber 1 and the connecting channels 111 and 112 (Fig. 3), the velocity of the liquid through the cylindrical measuring chamber 1 increases much more slowly. Thus, before the flow rate change through measuring chamber 1 increases to an inadmissibly large value that can lead to a dynamic error, the pressure between the inlet 1 and outlet 13 of the converter is equalized. With the next abrupt decrease in pressure at the inlet 12 of the converter, the flexible membrane 6, due to its elasticity, returns to its equilibrium state, compensating for the pressure drop created in a similar way.
    Harmful resonant phenomena caused by the mutual influence of the source of the pulsating fluid flow and the flexible membrane 6 are avoided by created local hydraulic resistances in the inlet chamber 7 of the quencher, formed by partial hydraulic separation of the semi-chambers 104 and 105. For the same purpose, the compensation hole 1051 on the outer wall also serves half-chambers 105 through which a part of the fluid flow from space 51 flows into the tangential inlet 101 of the measuring chamber 1. Due to the dephasing of amplitude values with the velocities of this stream and the stream coming from the inlet chamber 7 of the sedative, bullets5
    0
    five
    0
    five
    Cations of the total flow of fluid flowing through the cylindrical measuring chamber 1 are smoothed to a higher degree.
    权利要求:
    Claims (1)
    [1]
    Invention Formula
    A fluid flow converter comprising a housing with inlet and outlet nozzles, a cylindrical measuring chamber with a tangential inlet and an axial outlet with a turbine installed in the bearing supports with blades opposite the tangential inlet, a pulsation damper made of inlet and outlet chambers separated by a flexible membrane , while the input chamber is connected to the tangential input, and advantageous - with the output nozzle, as well as a photoelectric frequency converter
    ten
    16986 68
    rotation of the turbine, characterized in that, in order to improve measurement accuracy, the inlet chamber 7 of the pulsation damper is divided into two half-chambers, 105 and connected to the inlet nozzle through the inlets 1041, 1051. one of which 1051 is located opposite the tangential entrance 101 of the measuring chamber, and the second opposite the inlet nozzle 12, the turbine 3 is made with two rectangular flat vanes 31 and 32, in the axial output 107. The measuring element 1 has a guide element 4 having upper and lower bases 41 and 2 in the form of sec ora circle and interconnecting their helical surfaces k3, and the axial output 102 is connected to outlet pipe 13 by means of hydraulic throttles 52 "
    15
    20
    A A A L
    FI.2
    i
    3-9
    C MU
    19 W
    II
    9 798691
    ten
    20
    Schi 5
    thirty
    W
    THEM
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    同族专利:
    公开号 | 公开日
    AT46036T|1989-09-15|
    ES548425A0|1987-04-16|
    BG39753A1|1986-08-15|
    EP0180944A2|1986-05-14|
    PL147515B1|1989-06-30|
    DE3572729D1|1989-10-05|
    DD265300A3|1989-03-01|
    DK482885D0|1985-10-21|
    EP0180944A3|1987-03-25|
    PL256046A1|1986-10-07|
    DK482885A|1986-05-06|
    HUT39259A|1986-08-28|
    US4672854A|1987-06-16|
    JPS61129530A|1986-06-17|
    EP0180944B1|1989-08-30|
    ES8704631A1|1987-04-16|
    CS267679B1|1990-02-12|
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US4011757A|1975-05-14|1977-03-15|Floscan Instrument Company, Inc.|Device for bypassing flow rate pulsations around a flow rate transducer|
    US4292853A|1979-04-23|1981-10-06|Ferraris Development And Engineering Co., Ltd.|Fluid flow measuring apparatus|
    US4393724A|1981-06-12|1983-07-19|Vdo Adolf Schindling Ag|Flow meter having a rotary body|
    US4433583A|1982-06-21|1984-02-28|Kirk William H|Flow meter|CH673210A5|1987-07-17|1990-02-28|Turmix Ag|
    US5161410A|1991-02-27|1992-11-10|Intertech Development Company|Mass flow sensor for very low fluid flows|
    GB9210632D0|1992-05-19|1992-07-01|Fisons Plc|Compounds|
    AU2003233675A1|2002-05-22|2003-12-12|Henry Michael Taylor|Portable incendiary apparatus|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    BG8467412A|BG39753A1|1984-11-05|1984-11-05|Fluid flow converter|
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