JP3088383B2 - Test solution device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a test device such as a viscometer, a same-density type, and a concentration meter of a type in which a sample is vibrated in a measurement solution.

[0002]

2. Description of the Related Art In Japanese Patent No. 2709282, a vibrating unit is formed by connecting a vibrator 1 and a test sample 2 immersed in a measurement solution by a vibration transmission shaft 3.
Is shown in the casing 4 while being separated from the casing 4 and the test piece 2 is projected outward from the casing 4.

In the above prior art, when the vibration transmission shaft is supported overhead by the casing, the whole vibration unit is balancedly supported at one end of the casing, that is, at the outlet end of the transmission shaft, and the vibrator is transmitted through the transmission shaft. The transmission of vibration from the sample to the sample is attempted properly.

[0004] Further, a structure is adopted in which the outlet end of the transmission shaft in the casing is closed by the support member to prevent the measurement liquid from entering the casing from the sample side.

Further, the support member supports a portion including a node of resonance of the transmission shaft to prevent the vibration transmission function from being reduced, and the support member is formed of a spring member, so that the vibration transmission can be prevented from being reduced. They are trying to improve.

[0006]

However, an excessive external force is applied to the sample due to the flow rate and mass of the measuring solution, collision of solids formed in the measuring solution, washing by a high-speed shower, and the like. In addition, it is assumed that a center runout occurs, and this center runout impairs vibration characteristics and becomes a factor of deteriorating measurement performance.

[0007]

SUMMARY OF THE INVENTION The present invention appropriately solves the above-mentioned problems and contributes to the improvement of the function of the above-mentioned vibration-type test device.

[0008] In the test solution apparatus according to the present invention, the vibrator and the test solution immersed in the measurement liquid are connected by a vibration transmission shaft to form a vibration unit, and the vibrator is released into the casing. A first support means and a second support which are spaced apart in the axial direction of the vibration transmission shaft between the casing and the vibration transmission shaft. Form means.

The vibration transmission shaft is supported at each of the local portions separated in the axial direction, and the vibration unit is connected to the first unit.
The casing is supported overhead by the casing via the supporting means and the second supporting means, and an axial portion other than the support part by the first and second supporting means is extended away from the casing.

The vibrator and the test piece are connected via a vibration transmission shaft so as to resonate to form a vibration unit, and one or both of the first support means and the second support means are connected to the transmission shaft. Are arranged to support the above-mentioned resonance node.

As an example, a mass body for setting a resonance frequency is formed on a vibration transmitting shaft portion extending between the first support means and the second support means, and the mass body extends from one end of the mass body. The vibration transmission shaft is supported by the first support means,
The vibration transmission shaft extending from the other end of the mass body is connected to the second
Supported by supporting means.

As one suitable example, the mass member is set so that a first node is provided on a transmission shaft portion extending from one end of the mass member and a second node is provided on a transmission shaft portion extending from the other end. The vicinity of the first and second nodes is supported by the first and second support means.

Preferably, one or both of the first support means and the second support means are formed of a spring element which can be elastically deformed by vibration. One of the first support means and the second support means has a support structure that allows thermal expansion and contraction in the axial direction of the vibration transmission shaft.

As an example, the first support means and the second support means are arranged between the vibrator and the sampler, the first support means is arranged between the sampler and the vibrator, and the second support means is provided. The vibration transmission shaft can be disposed between a vibrator and a mass body provided at an end of the vibration transmission shaft opposite to the test piece.

According to the present invention, the vibration unit is stably supported at two or more points in the separated local portion of the extension length of the transmission shaft by the first and second support means, and the center deflection caused by the excessive external force applied to the sample is obtained. This effectively solves the deterioration of the vibration characteristics and the deterioration of the measurement performance caused by this.

In the above operation, the frequency is set by a mass body provided in the middle of the extension length of the transmission shaft so that a plurality of nodes exist in the middle of the extension length. By supporting by the support portion, the objective of the stable support of the transmission shaft can be achieved, and at the same time, the balance support for the vibration in the preceding example can be effectively achieved.

Further, the multi-point support has a structure in which one of the support means is used as a means for preventing the infiltration of the measuring liquid into the casing, and the other support means is a means for allowing expansion and contraction in the axial direction of the transmission shaft. Can be adopted, thereby effectively preventing the above performance from being lowered due to thermal expansion and contraction.

The first and second support means are means for forming an air chamber in a casing portion between the first and second support means. The air chamber has an outside air inlet and an inside air outlet, forms a heat insulating layer against radiant heat of the measurement liquid to which the test sample is immersed, and has a vibrator storage chamber in a casing in which the vibrator and the circuit are stored. Is effectively shielded from the radiant heat, and the vibrator and the circuit are protected from the radiant heat.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to FIGS. This test solution device has a vibration unit including a vibrator 1, a test solution 2 immersed in a measurement solution, and a vibration transmission shaft 3 as a detection element.

The vibrator 1 and the test sample 2 are connected by a vibration transmission shaft 3 to form a vibration unit.
Is released in the casing 4 and the sample 2 is projected outward from the casing 4 to be immersed in the measuring solution.

A first support means 5 is provided between the casing 4 and the vibration transmission shaft 3 in the axial direction of the transmission shaft 3.
And the second support means 6 are formed, and the vibration transmission shaft 3 is overhead-supported on the casing 4 via the first support means 5 and the second support means 6 at each of the local portions spaced apart in the axial direction.

The vibrator 1 is a known piezoelectric vibrator or an electromechanical transducer such as an electromagnetically driven vibrator. Here, as the vibrator 1, a circular vibrator that vibrates in a circular direction around the axis of the transmission shaft 3, particularly a piezoelectric circular vibrator using piezoelectric ceramic is used. The vibrator 1 and the sample 2 resonate via the vibration transmission shaft 3. This resonance causes the transmission shaft 3 to vibrate in a torsional vibration in the circular direction.

Therefore, the axis X of vibration of the vibrator 1 and the transmission axis 3
The three members 1, 2, 3 are connected so that the axis of the sample 2 and the axis of the sample 2 are the same.

The casing 4 is a metal or synthetic resin cylinder, and the vibrator is placed in the cylinder (casing 4) such that the axis of the cylinder coincides with the vibration axis X of the vibration unit. 1 and a part of the transmission shaft 3 extending from the vibrator 1 are housed, and the test sample 2 is extended from one end of the cylindrical body together with the other part of the transmission shaft 3. The other end of the cylindrical body, that is, the end on the vibrator 1 side is closed by an end wall 7, and one end of the cylindrical body, that is, the end on the test sample 2 side is provided by first support means 5 described later. Closed.

The sample 2 has an axially symmetric shape having the vibration axis X as a center. The external shape included in the axially symmetric shape includes a cylinder, a regular polygonal prism, a disk, a regular polygonal plate, and a rectangle. Plates, blocks with radial projections, etc., and also include these hollow bodies, in which the measurement liquid flows into the hollow body so that it comes into contact with the inner peripheral surface of the hollow section, etc. On the other hand, it is rigid.

Reference numeral 8 denotes a sensor for detecting a change in vibration when the sample 2 is immersed in the measurement solution 9 and resonated. The sensor 8 is composed of a piezoelectric element and has a mechanical-to-electric (voltage) conversion function, and the vibrator 1 similarly composed of a piezoelectric element has an electric (voltage) -to-mechanical conversion function. In this case, it does not prevent the piezoelectric vibrator 1 from being used also as the sensor.

The sensor 8 is arranged integrally with the vibrator 1 so that the axis X is aligned, or is mounted integrally with the shaft in the middle of the transmission shaft 3 extending into the casing 4.

A circuit board 10 necessary for the operation of the vibrator 1 and / or the sensor 8 is built in the casing. The circuit board 10 is arranged at a position close to the vibrator 1 and is housed in a vibrator housing chamber 11 in which the vibrator 1 is built.

For example, as shown in the figure, a circuit board 10 is attached to the end wall 7 of the casing 4 and the circuit board 10 is connected to the vibrator 1 and the sensor 8 by a lead 12 made of a flexible conductor wire.

A connector 13 is attached to the end wall 7, the connector 13 is connected to the circuit board 10 by a flexible cable 14, and an external device is connected to the connector 13 by a cable so as to be removable. The external device is, for example, a resonance driving device, an arithmetic device, a display device, or the like.

The first support means 5 and the second support means 6 are provided as means for supporting the vibration unit overhead in the casing 4. The first supporting means 5 is arranged so as to support the transmission shaft 3 while closing the opening at the end of the casing 4 on the side of the sample 2. The second supporting means 6 is provided at the intermediate portion of the casing 4. Arrange to support.

The vibrator 1 and the sample 2 are connected to a vibration transmission shaft 3
Are connected to resonate through the first support means 5
And / or the second support means 6 is arranged to support the first and second nodes P1 and P2 of the resonance of the transmission shaft 3.

FIG. 2 shows the vibration wave of the resonance of the vibration unit. The first and second nodes P1 and P2 exist on the transmission shaft 3 between the sample 2 and the vibrator 1 by setting the resonance frequency. Let me know.

According to the embodiment, the vibrator 1 and the test piece 2 are connected via a vibration transmission shaft 3 so as to resonate, and a vibration transmission extending between the first support means 5 and the second support means 6 is provided. A mass body 15 for setting a resonance frequency is formed on the shaft portion.
And a vibration transmission shaft 3b extending from the other end of the first and second support means 5,
6 is a configuration to support each.

The mass body 15 is attached to the transmission shaft 3a by a first
The node P1 is set, and the second node P is connected to the transmission shaft 3b.
2 is a node adjusting means for setting 2. The mass body 15 is provided so that the vibration axis X is aligned with the axis.

The transmission shaft 3 is inserted into the mass 15 or, as shown, the transmission shaft 3 is divided at a portion where the mass 15 is arranged, and each divided shaft end is connected to the mass 15. They are integrally connected on the same axis X. In this case, the divided transmission shaft forms a substantially integral transmission shaft 3 via the mass body 15.

The vicinity of the first node P1 on the transmission shaft 3a is supported by the first support means (a spring element 16 described later), and similarly, the vicinity of the second node P2 on the transmission shaft 3b is second. It is supported by supporting means (a spring element 17 described later).
The vicinity of the node means a region including the node or its vicinity.

As a preferred example, one or both of the first support means 5 and the second support means 6 are formed by spring elements 16 and 17 which can be elastically deformed by vibration. The spring elements 16 and 17 are formed by a cylinder as an example, and the transmission shaft 3 is inserted through the axis of the cylinder while being free from the peripheral surface of the cylinder.
The transmission shaft 3 is supported at one end of the cylindrical body, and support members 18 and 19 are integrally provided at the other end of each cylindrical body.
The outer ends of 8, 19 are integrally connected to the casing 4. The spring elements 16 and 17 and the support members 18 and 19 form the first and second support means 5 and 6.

Preferably, the first and second support means 5, 6
Has an axially symmetric shape so that the vibration axis X and the axis coincide. The support members 18 and 19 are parallel to each other and perpendicular to the axis X.

As a further preferred example, one of the first support means 5 and the second support means 6 has a support structure which allows thermal expansion and contraction in the axial direction of the vibration transmission shaft 3.

As a specific example, the first support means 5 (spring element 16) is integrally fixed to the peripheral surfaces of the transmission shafts 3 and 3a,
And the second support means 6 (spring element 17) is
Is supported so as to slide in the axial direction with respect to the peripheral surface of the shaft and to prevent the vibration in the direction orthogonal to the axis X. The first and second support means 5 and 6 are connected to the first and second support means 5 and 6, respectively.
An air chamber 21 is formed in the four casings located therebetween.

As means for forming the air chamber 21, the supporting means 5, 6 partition the inside of the casing 4 in the axial direction and have a structure that prevents air flow as much as possible. Are connected in the axial direction.

Therefore, both chambers 11 and 21 are provided with the second support means 6,
That is, a wall structure is provided which is divided by the partition wall and suppresses the flow of air in both chambers 11 and 21 as much as possible.

As a suitable example, the first and second support means 5, 6
Is formed in an annular structure such as a disk shape in a plan view, and the outer peripheral surface and the inner peripheral surface thereof are in close contact with the outer peripheral surface of the transmission shaft 3 and the inner peripheral surface of the casing 4, respectively, so that air flows between the two chambers 11 and 21. Cut off. The mass body 15 for frequency adjustment is arranged in the air chamber 21. Therefore, the air chamber 21 also functions as a mass storage chamber. An opening 20 for outside air circulation is provided in a portion of the casing 4 that defines the air chamber 21. The opening 20 is located on the axis X of the air chamber 21.
A plurality is arranged at one end side and the other end side in the direction, and one is an outside air inlet and the other is an inside air outlet.

The first supporting means 5 is provided on the sample 2 of the casing 4.
The side opening surface is sealed, and the casing 4
The measurement liquid 9 is prevented from entering the inside. The air chamber 21 faces the measurement liquid 9, and the air chamber 21 is interposed between the vibrator storage chamber 11 and the measurement liquid 9. As a result, the storage room 11 is thermally shut off satisfactorily.

[0046]

According to the present invention, the first and second support means can be used in a separated local portion in the extension length of the vibration transmission shaft.
The transmission shaft is stably supported at multiple points to effectively solve the core runout due to the excessive external force applied to the sample, resulting in a reduction in vibration characteristics and a deterioration in measurement performance.

Further, the multi-point support is a structure in which one of the support means is used as a means for preventing the infiltration of the measuring liquid into the casing, and the other support means is a means for allowing expansion and contraction in the axial direction of the transmission shaft. , Thereby effectively preventing the performance from being reduced due to thermal expansion and contraction of the transmission shaft.

In the above operation, the frequency is set by a mass body provided in the middle of the extension length of the transmission shaft so that a plurality of nodes exist in the middle of the extension length. By supporting by the support portion, the objective of the stable support of the transmission shaft can be achieved, and at the same time, the balance support for the vibration in the preceding example can be effectively achieved.

Further, the first and second support means form a heat insulating layer for radiant heat of the measurement liquid to which the test sample is immersed in an air chamber formed in the casing portion between the first and second support means. The vibrator housing chamber in the casing in which the vibrator and the circuit are housed is effectively shielded from the radiant heat, and the vibrator and the circuit can be protected from the radiant heat.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a test solution apparatus according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a liquid test apparatus showing the same other example, which is shown together with a vibration waveform.

FIG. 3 is a sectional view taken along line AA in FIG. 1;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 vibrator 2 test solution 3 vibration transmission shaft 3 a, 3 b vibration transmission shaft portion 4 casing 5 first support means 6 second support means 7 end wall 8 sensor 9 measurement liquid 10 circuit board 11 vibrator storage chamber 12 lead 13 connector Reference Signs List 14 Flexible cable 15 Mass body 16, 17 Spring element 18, 19 Support member 20 Opening for outside air circulation 21 Air chamber P1 First node P2 Second node X Vibration axis

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-8-247917 (JP, A) JP-A-7-35672 (JP, A) JP-A-59-15837 (JP, A) JP-B-42 17880 (JP, B1) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01N 11/00-11/16 G01N 9/00 JICST file (JOIS)

Claims (5)

(57) [Claims] A vibrator is formed by connecting a vibrator and a test piece by a vibration transmission shaft, and the vibrator is separated and housed in a casing, and the test piece is moved outward from the casing. Protrude into the measuring solution,
In a liquid test apparatus in which vibration of a vibrator is transmitted to a sample via a vibration transmission shaft to vibrate in a measuring solution, the vibration is transmitted between the vibration transmission shaft extending between the vibrator and the sample and the casing. A first support means and a second support means which are separated from each other in the axial direction of the transmission shaft are formed, and each local part of the vibration transmission shaft which is separated in the axial direction is supported by the first support means and the second support means. And the vibrating unit is supported by the casing in an imaginary manner, the vibrator and the test piece are connected so as to resonate via a vibration transmitting shaft, and the vibration transmission extending between the first supporting means and the second supporting means. A mass body for setting a resonance frequency is formed on the shaft portion, and a vibration transmission shaft portion extending from one end of the mass body and a vibration transmission shaft portion extending from the other end are formed on the first and second support means. A liquid test apparatus characterized in that it is configured to support each of them. 2. The liquid test apparatus according to claim 1, wherein the first support means and / or the second support means are arranged to support the resonance node of the transmission shaft. 3. A vibrating unit is formed by connecting a vibrator and a test piece by a vibration transmission shaft, and the vibrator is detached and housed in a casing, and the test piece is moved outward from the casing. Protrude into the measuring solution,
In a liquid test apparatus in which vibration of a vibrator is transmitted to a sample via a vibration transmission shaft to vibrate in a measuring solution, the vibration is transmitted between the vibration transmission shaft extending between the vibrator and the sample and the casing. A first support means and a second support means which are separated from each other in the axial direction of the transmission shaft are formed, and each local part of the vibration transmission shaft which is separated in the axial direction is supported by the first support means and the second support means. The vibration unit is supported overhead by a casing, and one of the first support means and the second support means has a support structure that allows thermal expansion and contraction in the axial direction of the vibration transmission shaft. Liquid device. 4. A vibrating unit is formed by connecting a vibrator and a test piece with a vibration transmission shaft, and the vibrator is separated and housed in a casing, and the test piece is moved outward from the casing. Protrude into the measuring solution,
In a liquid test apparatus in which vibration of a vibrator is transmitted to a sample via a vibration transmission shaft to vibrate in a measuring solution, the vibration is transmitted between the vibration transmission shaft extending between the vibrator and the sample and the casing. A first support means and a second support means which are separated from each other in the axial direction of the transmission shaft are formed, and each local part of the vibration transmission shaft which is separated in the axial direction is supported by the first support means and the second support means. The vibrating unit is supported by the casing aerial, and the first and second support means form an air chamber in a casing portion existing between the first and second support means. A test solution device comprising an outside air inlet and an inside air outlet from the same room to the outside of the room. 5. The method according to claim 1, wherein one or both of said first support means and said second support means are formed of a spring element which is elastically deformable against vibration. The test solution according to the above.