Straight tube type coriolis flowmeter for tertiary mode vibration with elastic connection member and pedestal
A connecting part, straight pipe technology, applied in the direction of direct mass flow meter, mass flow measuring device, measuring flow/mass flow, etc., can solve the problems of poor temperature change ability, axial stress dispersion of flow measuring tube 3, etc. , to achieve the effect of eliminating instrument error offset or deviation, improving the ability to deal with temperature changes, and improving rigidity
Inactive Publication Date: 2008-09-24
OVAL CORP
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Problems solved by technology
[0018] As can be seen from the above description, it is difficult for the conventional straight tube type Coriolis flowmeter 1 to disperse the axial stress acting on the flow measuring tube 3 in the direction of the tube axis.
Therefore, the conventional straight-pipe Coriolis flowmeter 1 has poor ability to respond to temperature changes
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[0046] Hereinafter, the present invention will be described with reference to the drawings. figure 1 It is a figure showing one embodiment of the straight tube type Coriolis flowmeter having the three-dimensional mode vibration of the elastic connecting member and the base of the present invention, (a) is a cross-sectional view of the straight tube type Coriolis flowmeter, ( b) is a perspective view showing the positional relationship between the flow measuring tube, the base, and the elastic connecting member. in addition, figure 2 and image 3 Each of (a) ~ (d) is to show that in figure 1 A schematic diagram of the state of the flow measuring tube, the base and the elastic connecting member when the temperature of the fluid to be measured flowing inside the flow measuring tube of the straight tube Coriolis flowmeter rises and falls.
[0047] exist figure 1 Among them, firstly, the same components as those in the prior art example are mentioned, that is, the straight ...
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A straight tube type coriolis flowmeter (21), comprising a straight tube-like flow tube (3), a drive device (7) driven by a tertiary mode vibration, a pair of detection means (8) detecting a phase difference in proportion to a coriolis force, a pedestal (22) with rigidity, and an elastic connection member (23) with elasticity. Where the axial direction of the flow tube (3) is designated as a Z-axis, the driving direction of the drive device (7) is designated as an X-axis, and a direction crossing perpendicularly to the Z-axis and the X-axis is designated as a Y-axis, the elastic connection member (23) is formed in such an elastic body that its rigidity in the Z-axis direction is lower than its rigidities in the X-axis direction and the Y-axis direction and its rigidity in a rotating direction about the Y-axis is lower than its rigidities in a rotating direction about the Z-axis and the rotating direction about the X-axis.
Description
technical field [0001] The invention relates to a straight tube Coriolis flowmeter, which obtains the mass flow rate and / or vibration frequency of the measured fluid by detecting the phase difference and / or vibration frequency proportional to the Coriolis force acting on the flow measuring tube Or density, in detail, relates to a straight tube type Coriolis flowmeter that vibrates a straight tube (flow measuring tube) in a three-dimensional mode and has an elastic coupling member and a base structurally. Background technique [0002] The straight tube type Coriolis flowmeter is configured so that when a vibration in a direction perpendicular to the axis of the straight tube is applied to the central part of the straight tube (flow measuring tube) supported at both ends, the The displacement difference of the straight pipes due to the Coriolis force is the phase difference signal, and the mass flow rate is detected based on the phase difference signal. Such a straight tube t...
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IPC IPC(8): G01F1/84
CPCG01F1/849G01F1/8409G01F1/8413G01F1/8418
Inventor 中尾雄一
Owner OVAL CORP