Venturi flow meter
A flow meter and Venturi technology, applied in the field of Venturi flow meters, can solve problems such as unfavorable increase of EGR rate and EGR flow rate, increase of throttling loss of EGR system, valve disturbance, etc.
Pending Publication Date: 2019-03-08
WEICHAI POWER CO LTD
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Problems solved by technology
[0003] The combined use of EGR valve and Venturi flowmeter at the same time increases the number of throttling devices in the EGR system, and the throttling loss of the EGR system increases, which is not conducive to improving the EGR rate and EGR flow. In addition, the traditional EGR valve generally adjusts the airflow through the valve plate, and the airflow passes through the When the valve plate is used, it is easily disturbed by the valve plate, which will interfere with the measurement of the Venturi flowmeter behind and reduce its measurement accuracy
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[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0025] see figure 1 with figure 2 , figure 1 A schematic diagram of the structure of the Venturi flowmeter provided by the embodiment of the present invention when it is turned on, figure 2 Schematic diagram of the cut-off structure of the Venturi flowmeter provided by the embodiment of the present invention.
[0026] The embodiment of the present invention provides a Venturi flowmeter, which includes a main pipe section 1 , a throat pipe section 2 and a ...
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The invention discloses a venturi flow meter, which comprises a main pipe section, a throat pipe section and a throat pressure tapping pipe. The main pipe section is provided with an inlet and an outlet, and the pipe wall of the main pipe section is provided with a high-pressure pressure tapping port and a low-pressure pressure tapping port; the throat pipe section and the main pipe section are connected coaxially and hermetically, and the throat pipe section is capable of axially reciprocating relative to the main pipe section; a first end of the throat pressure tapping pipe is communicated with the low-pressure pressure tapping port, a second end extends to a throat of the throat pipe section, and the second end of the throat pressure tapping pipe enables connection and disconnection between the throat pipe section and the main pipe section along with relative movement of the throat pipe section and the main pipe section. Therefore, the venturi flow meter has an EGR valve function, the amount of throttling devices in a system can be decreased, throttling loss is reduced, the EGR rate and the EGR flow rate can be increased, use of valve blocks is avoided, a through-flow section isconstant an annular section, high symmetry, low airflow disturbance and low fluctuation are realized, high uniformity and stability of EGR airflow are realized, and precision in measurement of EGR exhaust gas flow rate is improved.
Description
technical field [0001] The invention relates to the technical field of engine EGR, in particular to a Venturi flowmeter. Background technique [0002] The current EGR engine EGR system uses the combination of EGR valve and Venturi flowmeter: the EGR valve controls the flow of EGR exhaust gas, and the Venturi flowmeter measures the flow of EGR exhaust gas. [0003] The combined use of EGR valve and Venturi flowmeter at the same time increases the number of throttling devices in the EGR system, and the throttling loss of the EGR system increases, which is not conducive to improving the EGR rate and EGR flow rate. In addition, the traditional EGR valve generally adjusts the airflow through the valve plate, and the airflow passes through the When the valve is installed, it is easily disturbed by the valve, which will interfere with the measurement of the Venturi flowmeter behind and reduce its measurement accuracy. Contents of the invention [0004] In view of this, the objec...
Claims
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IPC IPC(8): G01F1/44G01F15/00
CPCG01F1/44G01F15/00
Inventor 杨豫魁代子阳姚旺张广西刘学哲王新校
Owner WEICHAI POWER CO LTD