JPS58151819U - Ultrasonic flowmeter for internal combustion engine intake air - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

Figure 1 is a schematic configuration diagram of an ultrasonic flow meter for internal combustion engine intake air using the sing-around method, Figure 2 is a cross-sectional view of a conventional vibrator used in an ultrasonic flow meter, and Figure 3 is the same as that of Figure 2. A waveform diagram showing the vibration damping state when a pulsed voltage is applied to the vibrator, FIG. 4 is a cross-sectional view of an embodiment of the present invention, and FIG.
The figure is a waveform diagram similar to that in Figure 3 when a pulsed voltage is applied to the vibrator in Figure 4, and Figure 6 is a cross-sectional view showing the vibrator in Figure 4 installed in an ultrasonic 5 flowmeter. , FIG. 7, and FIG. 8 are sectional views showing other embodiments of the present invention, respectively. 1...Pipe, 2a, 2b...Ultrasonic transmitter, 3a, 3b...Ultrasonic receiver, 1
1... Vibrator, 12... Horn, 14
...Case, 15 ...Lead wire, 16
・・・・・・Partition plate, 17.17A・・・Vibration absorber. ”Water 3! I! l Huge $4# l- 112! /[5M

Claims (1)

[Scope of utility model registration request] An ultrasonic flowmeter for internal combustion engine intake air, comprising a pipe through which a fluid to be measured passes, and means attached to a side wall of the pipe for transmitting and receiving ultrasonic waves in a direction perpendicular to the central axis of the pipe, An internal combustion engine intake device, characterized in that the ultrasonic transmitting/receiving means comprises an electromechanical transducer housed in a case, and a vibration absorbing material filled at least behind the electromechanical transducer in the case. Ultrasonic flow meter for air.