Measuring and testing – Specific gravity or density of liquid or solid
Patent
1998-12-15
2000-02-29
Williams, Hezron
Measuring and testing
Specific gravity or density of liquid or solid
73702, G01N 900
Patent
active
060295015
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
First, the present invention relates to a vibration gas density meter in which anti-vibration properties are improved, no specific anti-vibration measures are necessary, and the intrinsically safe explosion-protected construction is easily adopted.
Second, the present invention relates to a vibration gas density meter in which its temperature characteristics are improved, no specific heat-insulating measures are necessary, and the intrinsically safe explosion-protected construction is easily adopted.
Third, the present invention relates to a vibration gas density meter in which its ambient temperature characteristics are improved.
Fourth, the present invention relates to a vibration gas density meter in which its sensitivity is improved and the pressure loss is less.
2. Description of the Prior Art
FIG. 1 shows a drawing to illustrate the configuration of an embodiment of the prior art generally used to date. This drawing is, for example, shown on page 4 of the catalog titled "DG8 type Gas Density Meter," published on Jul. 15, 1990, by Yokogawa Electric Corporation.
FIG. 2 shows an A--A cross sectional drawing for FIG. 1, and FIGS. 3 and 4 are drawings for explaining operations of the embodiment indicated in FIG. 1.
In FIG. 1 and FIG. 2, numeral 1 shows the center block provided to avoid requiring a large flow of a sample gas.
Numeral 2 shows a resistance thermometer embedded in center block 1.
Numeral 3 shows an inside cylinder incorporating resistance thermometer 2 concentrically.
Numeral 4 shows an outside cylinder incorporating inside cylinder 3 concentrically.
Numeral 5 shows a thin wall cylindrical resonator provided between inside cylinder 3 and outside cylinder 4 concentrically.
Numeral 6 shows vibratory elements to excite cylindrical resonator 5. In this case, piezo-electric elements are used.
Numeral 7 shows a case incorporating outside cylinder 4.
Numeral 8 shows a sleeve to fix one end of outside cylinder 4 to case 7. In this case, rigid tetra-fluoro-ethylene (teflon) is used for sleeve 8.
Numeral 9 shows the O-ring 1 that seals the gap between outside cylinder 4 and sleeve 8.
Numeral 11 shows the O-ring 2 that seals the gap between sleeve 8 and case 7.
Numeral 12 shows a piece of vibration-proof rubber through which the other end of outside cylinder 4 is fixed to case 7.
Numeral 13 shows a ring-shaped inside flow way of the resonator that is provided inside bottom block 14 of outside cylinder 4 and that supplies a sample gas to the inner cylindrical surface of cylindrical resonator 5.
Numeral 15 shows the outside flow ways of the resonator that supply a sample gas to the outer cylindrical surface of cylindrical resonator 5. These outside flow ways of the resonator are provided through bottom block 14 of outside cylinder 4 and are arranged on a circumference at the outside of inside flow way of resonator 13 avoiding vibratory elements 6. In this case, four flow ways are provided.
In the above configuration, as shown in FIGS. 3 and 4, the sample gas enters inside cylinder 3, turns back at the lower end of inside cylinder 3, and enters bottom block 14 of outside cylinder 4. The sample gas is then branched to inside flow way of resonator 13 and the outside flow ways of resonator 15. The sample gas then passes along the inner and outer cylindrical surfaces of cylindrical resonator 5 and flows out of outside cylinder 4.
The density of a sample gas is determined by measuring the resonance frequency of cylindrical resonator 5 by utilizing the fact that the resonance frequency of cylindrical resonator 5 varies with the density of gas around cylindrical resonator 5.
However, in such a device,
(1) Outside cylinder 4 is supported by case 7 through sleeve 8 and vibration-proof rubber 12.
Accordingly, outside cylinder 4 was provided with general anti-vibration measures against case 7. However, since sufficient vibration-resistant construction was not considered, vibration propagated from case 7 or the gas piping for introducing a sample gas. For this re
REFERENCES:
patent: 4429564 (1984-02-01), Ikeda et al.
patent: 4495818 (1985-01-01), Ikeda et al.
Kawamura Ryuichi
Nishino Hiroshi
Sasaki Mitsuhiko
Suzuki Junichi
Yasuda Shigeo
Kojima Moonray
Kwok Helen C.
Williams Hezron
Yokogawa Electric Corporation
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