JPH11271206A - Vibration type liquid examination device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration type liquid examination device in the form of connecting a vibrator to a liquid examiner via a vibration transmitting shaft capable of effectively restricting the change of magnetic vibration performance or piezoelectric vibration performance due to conducted heat applied from the liquid examiner in a high- or low-temperature liquid to be measured through the transmission shaft to the vibrator and improving the reliability of liquid examining precision. SOLUTION: In a liquid examination device, a vibrator 1 is connected to a liquid examiner 3 via a vibration transmission shaft 2 to transmit the vibration of the vibrator 1 to the liquid examiner 3 via the vibration transmission shaft 2. In this case, a heat exchange element 16 is provided on the way of the vibration transmission shaft 2 between the vibrator 1 and the liquid examiner 3 to reduce heat conduction between the liquid examiner 3 and the vibrator 1 with the heat exchange element 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid measuring device such as a clay meter or a density meter which vibrates a liquid sample using an electric / mechanical oscillator such as a piezoelectric vibrator or an electromagnetic vibrator as a drive source.

[0002]

2. Description of the Related Art Japanese Patent Publication No. 5-20693 and Japanese Patent No. 2709
No. 282 couples a vibrator and a sampler via a vibration transmission shaft, transmits vibration of the vibrator to the sampler via the vibration transmission shaft, and vibrates the sampler in the measurement solution; There is disclosed a test solution device that detects a change in vibration according to the viscosity or specific gravity of a measurement solution.

[0003]

However, in the above test solution, when the test solution is at a high temperature, the heat of the test solution is transferred from the test sample to the vibration attached to the shaft end via the vibration transmission shaft. Conduction causes fluctuations in the magnetic vibration performance and piezoelectric vibration performance of the vibrator, which is a cause of deteriorating measurement accuracy.

Further, even when the measurement liquid is at a low temperature, the heat of the vibrator is conducted to the test liquid via the vibration transmission shaft and is taken away by the measurement liquid. As a result, the vibrator is excessively cooled, and The same problem occurs.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a test apparatus for transmitting vibration of a vibrator to a test sample via a vibration transmission shaft. A vibration type test apparatus is provided, wherein a heat exchange element is provided in the middle, and heat conduction between the test element and the vibrator is reduced by the heat exchange element.

The present invention is a problem specific to a test device in which a vibrator and a test sample are connected via a vibration transmission shaft.
The above-mentioned heat exchange element effectively shuts off the phenomenon that the vibrator is heated by the heat of the high-temperature measurement liquid transmitted from the sample and the phenomenon that the vibrator is cooled by the heat of the low-temperature measurement liquid. Maintain soundness and improve detection reliability.

[0007] The vibrator and the heat exchange element are housed in an envelope, and a gas inlet for introducing gas into the envelope and a gas outlet for extracting gas from the envelope are housed in the envelope. The gas flow in contact with the heat exchange element is positively generated to promote the effect of maintaining the vibration performance of the element.

Further, the heat exchange element is formed by a plurality of heat exchange fins arranged so as to generate a gas flow in the axial direction of the vibration transmission shaft, thereby further improving the function.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a vibration type liquid test apparatus provided as Japanese Patent No. 2709282.

This liquid measuring device constitutes a vibration unit in which a piezoelectric vibrator 1 and a liquid vibrator 3 are directly connected by a vibration transmission shaft 2, and this vibration unit is supported overhead by a support member 6 in the middle of the transmission shaft 2. The sampler 3 is caused to vibrate (resonate) in directions opposite to each other by the vibration of the vibrator 1, and the node O of the resonance is supported by the support member 6.

A mass 15 for setting a resonance frequency is provided at an end of the vibrator 1 opposite to the sample 3, and an end of the mass 15 opposite to the sample 3. Is provided with a vibration sensor 12. The vibration sensor 12 is a piezoelectric element that electrically converts and detects a change in vibration according to the measurement liquid 10 detected by the test piece 3.

A heat exchange element 16 is provided in the middle of the vibration transmission shaft 2 extending between the vibrator 1 and the sample 3. The heat exchange element 16 has a cylindrical portion 17 that is thermally in close contact with the transmission shaft 2 and is externally inserted and fixed at a fixed position, and heat exchange fins 18 that are protruded from the outer peripheral surface of the cylindrical portion 17.

The heat exchange fins 18 are preferably arranged to generate a gas flow in the axial direction of the vibration transmission shaft 2. As a specific example, as shown in FIGS. 1 and 2, a plurality of thin-walled heat exchange fins 18 protrude radially from the cylindrical portion 17 with respect to the transmission shaft 2, and the heat exchange fins 18 The gas flow in the axial direction of the transmission shaft 2 is promoted through the space between the heat exchange fins 18 and extends in the direction of the axis Z to improve the heat exchange efficiency. In this case, it is desirable that the axial length of the cylindrical portion 17 be substantially the same as the axial length of the heat exchange fins 18.

As shown by a virtual line in FIG.
In order to protect the heat exchanger element 6 and the heat exchange element 6, both are housed in the envelope 5, and the envelope 5 and the support member 6 are integrally formed to substantially support the vibration unit by the envelope 5. At the same time, both 1 and 16 as well as the mass body 15 and the vibration sensor 12 are sealed in the envelope 5.

The electric wires 13 and 14 to the vibration sensor 12 and the vibrator 1 can be connected to an external control device through the envelope 5.

The effect of the heat exchange element 16 is as follows.
Is housed in the envelope 5, and the envelope 5 is provided with a gas inlet 19 for introducing gas into the envelope 5 and a gas outlet 20 for extracting gas from inside the envelope 5. , Is further encouraged.

The gas introduced into the envelope 5 through the gas inlet 19 is led out from the gas outlet 20 by the following configuration.
A fresh gas flow in the envelope 5 is generated, the heat exchange function of the heat exchange element 16 is improved, the heat applied to the vibrator 1 via the transmission shaft 2 is effectively cut off, and the performance is maintained. I do.

The gas introduced from the gas inlet 19 is discharged to one end opening side in the direction of the axis Z between the fins 18 forming the heat exchange element 16, and flows between the fins 18 toward the other end opening side. To do it.

The gas flow flowing along the axis Z is the fin 1
8 enhances the heat exchange effect, and at the same time, flows in the axial direction in contact with the surface of the vibrator 1 to perform direct heat exchange.

In FIG. 3, a preamplifier or a circuit board 21 including the preamplifier is provided in the envelope 5, and the circuit board 21 is mounted on the side of the vibration unit opposite to the sample 3 and is connected to the vibration unit. For example, they are provided separately and provided directly or indirectly integrally with the envelope 5 on an end wall or the like of the envelope 5 opposite to the support portion 6.

The circuit board 21, the vibrator 1, and the vibration sensor 12 are connected to the fine conductive wires 13, 1 having a large degree of freedom.
4 and an end wall of the envelope 5 opposite to the support portion 6 is formed by an openable / closable lid 22, and the internal circuit board 21 is connected to the lid 22 to an external control device 29. Connector 23 is provided integrally.

The gas inlet 19 is provided at an arbitrary portion of the envelope 5 and a pipe from the gas inlet 19 is used to connect one end of the heat exchange element 16, for example, an end on the sample 3 side. Gas can be discharged to the

As described above, the gas flow flowing between the fins 18 of the heat exchange element 16 flows in contact with the surface of the vibration sensor 12 and the circuit board 21 and directly exchanges heat with them. It is derived from the outlet 20.

The present invention can be embodied in a liquid test apparatus of a type in which the test piece 3 and the vibrator 1 are vibrated in opposite directions, and also in a form in which the test piece 3 and the vibrator 1 are vibrated in the same direction.

For example, in the present invention, the test piece 3 of the vibration transmission shaft 2 is used.
The magnet provided at the opposite end is electromagnetically reciprocally rotated (vibrated) by an electromagnetic coil fixed to the envelope 5, and the heat exchange element 16 is transmitted by vibration. The case where it is provided on the shaft 2 is included. Also in this case, there are a case where the vibrator 1 and the sample 3 vibrate in opposite directions and a case where they vibrate in the same direction.

When the above-mentioned heat exchange element 16 is formed by a plurality of heat exchange fins 18, as shown in FIG. 4B, the heat exchange fins 18 are arranged in a single or plural concentric circles around the axis. , As shown in FIG.
It can be arranged in multiple stages in the direction.

As shown in FIGS. 4A and 4B, the heat exchange fins 18 at each stage can be provided with holes 24 or grooves 25 for promoting gas flow in the axial direction. The above gas inlet 19
As the gas introduced from, air, nitrogen gas, helium, or the like is applied.

Further, as shown in FIG.
Is provided with a compressor 26 for forcibly sending the gas. When the measurement liquid 10 has a high temperature, a cooler 27 is provided together with the compressor 26, and a low-temperature gas is introduced into the envelope 5 through the inlet 19.

An exhaust device 28 such as a fan for forcibly exhausting the gas in the envelope 5 through the gas outlet 20 is provided.
Enhances the gas flow in the envelope 5. This exhaust device 28,
The compressor 26 and the cooler 27 are selectively used.

[0030]

According to the present invention, there is a problem in a vibration type liquid test apparatus in which a vibrator and a test piece are connected via a vibration transmission shaft. Or, the fluctuation of magnetic vibration performance or piezoelectric vibration performance due to conduction heat of the vibrator due to the low temperature measurement liquid is effectively prevented by the heat exchange element arranged at the above position, and the vibration performance of the preamplifier and the vibration sensor is also reduced. Effective maintenance can be achieved, and the reliability of the test solution accuracy can be significantly improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a vibration type liquid test apparatus showing one embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA in FIG.

FIG. 3 is a cross-sectional view showing another example of the above-mentioned test solution device.

FIG. 4A is a cross-sectional view showing another example of the heat exchange fins in the above-mentioned liquid inspection apparatus, and FIG. 4B is a plan view showing still another example of the fins.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Oscillator 2 Vibration transmission shaft 3 Test solution 5 Enclosure 6 Support member 10 Measurement solution 12 Vibration sensor 13 Wiring 14 Wiring 15 Mass body 16 Heat exchange element 17 Cylindrical part 18 Heat exchange fin 19 Gas inlet 20 Gas outlet DESCRIPTION OF SYMBOLS 21 Circuit board 22 Lid 23 Connector 26 Compressor 27 Cooler 28 Exhaust device

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[Procedure amendment]

[Submission date] February 4, 1999

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

Claims (3)

[Claims] In a test apparatus, a vibrator and a test piece are connected via a vibration transmission shaft, and the vibration of the vibrator is transmitted to the test piece via the vibration transmission shaft. A vibration type liquid test apparatus, wherein a heat exchange element is provided in the middle of the vibration transmission shaft between the test liquids, and heat conduction between the test liquid and the vibrator is reduced by the heat exchange element. 2. A housing for accommodating the vibrator and the heat exchange element in an envelope, a gas inlet for introducing gas into the envelope, and a gas introduction port for discharging gas from the interior of the envelope. 2. The vibration type liquid test apparatus according to claim 1, wherein an outlet is provided. 3. The vibration according to claim 1, wherein the heat exchange element is formed by a plurality of heat exchange fins arranged to generate a gas flow in an axial direction of the vibration transmission shaft. Shape test device.