JPH0712697A - Moisture collector for moisture meter - Google Patents

Abstract

PURPOSE:To improve the measurement efficiency of a moisture meter. CONSTITUTION:A moisture meter comprises a heating division 12 which introduces a carrier gas to heat a measurement target, a moisture collector 14 which adsorbs vaporization moisture from the carrier gas led out of the heating division, an electronic balance unit 16 which detects an increment weight of the moisture collector 14, and a filter which adsorbs off vaporization products other than vaporization moisture. The moisture collector 14 has a cell base 14a to which a carrier gas introduction tube 32 is connected, and a cell main body 14c filled with an adsorbent 14b which adsorbs vaporization moisture. The cell base 14a is provided with a connector division 14d for attaching the tube 32 and a cylindrical projection 14f which contacts the load transmission shaft 16a of the balance unit. The cell main body 14c is inserted and installed into a hole 14e via an insertion division 14h. The cell main body 14c contains the insert of a mesh 14i and is fitted with a cap 14k on the upper end side. The cap 14k is provided with plurality of symmetric exhaust openings 14l directing horizontally.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moisture collector for a moisture meter, and more particularly to heating an object to be measured to vaporize the moisture in the object to be measured, and to collect and measure the vaporized moisture. The present invention relates to a moisture collection device for a moisture meter that measures the amount of moisture in an object to be measured.

[0002]

2. Description of the Related Art The KF method (Karl Fisher method) is known as a means for measuring the amount of water in a solidified or liquid. This KF method is widely used as a highly accurate water quantification method and has become a standard method in each field.
The KF method uses a Karl Fischer reagent (KF reagent) containing iodine, sulfur dioxide, pyridine and methanol as components.
It is a method that utilizes quantitative reaction with water. In this way, the titer of reagent (H ₂ 0 / ml) leave orientation with standard, by measuring the equilibrium dropping amount of KF reagent was added dropwise to the reagent in the measurement object, and orientation titer , It is possible to know the water content in the measured object.

However, such a method for measuring the amount of water has a drawback that it requires a considerable skill in handling and requires a special reagent or a glass container. Therefore, recently, there has been proposed a moisture meter that measures the amount of water in an object to be measured by heating the object to be measured, vaporizing the water in the object to be measured, and collecting and measuring the vaporized water. ing. However, even such a moisture meter has the technical problems described below.

[0004]

That is, in the above-described moisture meter, a cylindrical cell filled with an adsorbent such as zeolite is usually used, and the adsorbent collects vaporized water, and the increased weight is For example, although it is measured by an electromagnetic balance type electronic balance, in such a moisture meter, it is an essential condition to introduce a carrier gas carrying vaporized moisture into the cell and bring the carrier gas and the adsorbent into contact with each other. Becomes

In this case, as a means for introducing the carrier gas into the cell, a flexible tube that does not affect the weighing of the electronic scale is generally used. by the way,
The adsorbent filled in the cell has a limited adsorption performance, and for example, the adsorbent needs to be replaced quite frequently depending on an object to be measured having a very large water content. However, when the adsorbent is replaced in this way, if the tube is directly connected to the cell and the cell with the replaced adsorbent is set in the electronic balance, the tube may be twisted and The measured value fluctuates.

Therefore, in this type of moisture meter, the tube was untwisted and the measurement was started after waiting until a stable measurement was possible. However, in such measurement, the measurement efficiency becomes very poor. There was a problem. The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a moisture collection device for a moisture meter capable of improving the measurement efficiency. Another object is to improve the measurement accuracy of the moisture meter.

[0007]

In order to achieve the above object, the present invention introduces a carrier gas from the outside to heat an object to be measured in a heating section, and vaporizes moisture from the carrier gas derived from the heating section. In a moisture collector for a moisture meter that collects and measures the amount of vaporized water, a flexible tube for introducing the carrier gas is connected, and is connected to a balance unit that measures the amount of vaporized water. A cell base, a cell main body which is installed in communication on the cell base and is filled with an adsorbent that traps the vaporized water, and a cap that closes the cell main body.

The cap may be provided with a plurality of outlets that are oriented in the horizontal direction and are symmetrical with respect to the center of the cell body.

[0009]

According to the moisture collector for a moisture meter having the above structure, a flexible tube for introducing a carrier gas is connected, and
A cell stand that is connected to a balance unit that measures the amount of vaporized water, a cell body that is installed in communication on the cell stand and is filled with an adsorbent that traps the vaporized water inside, and a cap that closes the cell body. When the adsorption function of the adsorbent is exhausted and needs to be replaced, the cell body is separated from the cell base, the adsorbent in the cell body is replaced, and the cell base is replaced again. The flexible tube for introducing the carrier gas does not change at all when the adsorbent is replaced.

Further, according to the second aspect of the invention, the cap for closing the cell body is provided with a plurality of outlets which are oriented in the horizontal direction and are symmetrical with respect to the center of the cell body. The discharge reaction force of the carrier gas discharged from the discharge port is offset.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. 1 to 4 show an embodiment of a moisture collecting device for a moisture meter according to the present invention.
FIG. 1 is a path and a functional block diagram of a fluid system of a moisture meter to which the moisture collecting apparatus of the present invention is applied. The moisture meter shown in the figure is a gas introducing unit 10 that generates a carrier gas A.
A heating section 12 for introducing the carrier gas A from the gas introducing section 10 to heat the object to be measured X, and the heating section 12
It is provided with a moisture collecting device 14 for collecting vaporized moisture from the carrier gas B derived from the above, and a known electronic balance unit 16 for detecting the increased weight of the moisture collecting device 14.

A filter 18 for adsorbing and removing vaporized substances other than vaporized moisture in the carrier gas B is provided in the preceding stage of the moisture collector 14. The gas introduction unit 10 is
The air pump 10a, the air supplied from the air pump 10a, and the dry nitrogen N ₂ (H
and an inert gas such as e), a desiccator unit 10c for producing a carrier gas A by drying the mixed or single gas C sent from the electromagnetic valve 10b, and heating. Needle valve 1 for controlling the flow rate of the carrier gas A supplied to the section 12
0d and a flow sensor 10e that detects the flow rate of the carrier gas A supplied to the heating unit 12.

FIG. 2 shows the heating unit 12 and the filter 18.
FIG. 3 is a detailed view of FIG. 3, in which the heating unit 12 has a cylindrical heating tube 12a having one end opened, and the heating tube 12a is supported by a plurality of support plates 12b. Further, the heating tube 12a is provided with a heating zone and a non-heating zone such that the longitudinal axis direction thereof is divided into two substantially equal parts, and a portion corresponding to the heating zone is covered with the outer periphery thereof. A sheet-shaped heater 12c is wound and fixed.

Further, a door receiving plate 12d is fixed to the open end of the heating pipe 12a, and the heating pipe 1 is attached to the door receiving plate 12d.
A door 12e for opening and closing the open end of 2a is hinged. Then, on the inner surface of the door 12e, a heat-resistant cushion material 12f that abuts on the open end of the heating tube 12a and a heat-resistant and non-breathable cover 12g that covers the surface of the cushion material 12f are attached. It is worn.

On the rear end side of the heating zone of the heating tube 12a,
An inlet 12h for the carrier gas A that communicates with the flow sensor 10e of the gas inlet 10 is provided, and the heating tube 12a is provided substantially at the center of the non-heating zone of the heating tube 12a.
A through hole 12i is formed through the through hole 12i.
The filter 18 is fixedly installed at i, and the carrier gas B discharged from the heating unit 12 is guided into the filter 18.

The object X to be measured is housed in the carrier 20 and, with the door 12e opened, first introduced into the non-heating zone of the heating pipe 12a, closed by the door 12e, and then transferred to the heating zone a. Here, heat is applied by the heater 12c. The carrier 20 includes a frame 20a formed in a substantially rectangular shape, a pair of front and rear rollers 20b and 20c rotatably supported on a short side of the frame 20a, and a heat-resistant container 20d for placing and storing an object to be measured X. It consists of and.

The frame 20a and the rear roller 20c of the carrier 20 are made of stainless steel which is a non-magnetic material, and the front roller 20b is made of a permanent magnet. The moving mechanism 22 of the carrier 20 includes a suction arm 22a installed on the outer periphery of the non-heating zone of the heating tube 12a, a guide rail 22b below the heating tube 12a and extending along the longitudinal axis thereof, and a guide rail. A flexible rack 22c movably mounted on the lower surface side of the rack 22b and the rack 22c.
It has a pinion 22d that meshes with c and a geared motor (not shown) that rotationally drives the pinion 22d.

A magnet 22e for attracting the front roller 20b is provided on the tip end side of the suction arm 22a.
The guide rails 22b are provided on the lower case 26 of the upper and lower cases 24 and 26 that cover the outer circumference of the heating unit 12, and are fixed to the plurality of fixtures 22
It is supported by f. Further, on the upper surface side of the guide rail 22b, a pair of limit switches (not shown) for detecting the position of the suction arm 22a corresponding to the movement stroke of the carrier 20 is installed. In addition, in FIG. 2, a member denoted by reference numeral 28 is a protective cylinder that covers the outer circumference of the heater 12c wound around the outer circumference of the heating tube 12a.

In the moving mechanism 22 constructed as described above, the object X to be measured is stored in the carrier 20, and the door 12e
When the pinion 22d is driven by the geared motor after being introduced into the non-heating zone of the heating tube 12a and closed by the door 12e in the opened state, the rack 22c meshed with the pinion 22d causes the rack 22c to mesh with the heating zone side of the heating tube 12a. Move to.

Along with this movement, the suction arm 22a also moves to the heating zone side of the heating tube 12a. At this time, since the magnet 22e attracts the front roller 20b of the carrier 20, the suction arm 22a moves with it. The carrier 20 also moves to the heating zone a side of the heating pipe 12a. Then, when the carrier 20 is completely moved into the heating zone, this is detected by the limit switch, and the rotational drive of the motor is stopped.

When the heating of the object to be measured X is completed, the reverse operation is performed and the door 12e is opened to take out the burned residue of the object to be measured X from the inside of the heating pipe 12a. You can The movement of the object to be measured X is not limited to the movement mechanism 22 and may be moved to the heating zone of the heating pipe 12a by manual operation, for example. The filter 18 is a hollow cylindrical holder 18 with an open upper end.
The holder 18a has a hollow cylindrical insertion portion 18b protruding from the center of the lower end of the holder 18a, and a cap 18c screwed to the upper end of the holder 18a. The holder 18a is filled with an adsorbent that adsorbs and holds vaporized substances other than vaporized moisture in the carrier gas B, and the adsorbent is a gas other than vaporized moisture that is generated when the object to be measured X is heated. Compounds, for example, basic gases such as ammonia and trimethylamine, various organic substances and inorganic substances, and the like. For example, activated carbon having different pore sizes mixed therein or activated carbon impregnated with an acidic substance is preferably used.

The filter 18 constructed in this way is
Through-hole 1 in which the insertion portion 18b is formed in the upper portion of the heating tube 12a
It is attached by inserting it into 2i and fixing it by welding or the like. Then, by connecting the connector 30 to the protrusion 18d provided on the cap 18c, the filter 18 and the water collecting device 14 are connected to each other via the tube 32. The installation location of the filter 18 is not limited to that shown in the figure.
It can also be provided on the heater 12c side of a.

3 and 4 show details of the water collecting device 14. The water collection device 14 shown in the figure has a cell stand 14a to which one end of the tube 32 is connected, and an adsorbent 14b for adsorbing vaporized water, for example, a cell body 14c filled with zeolite. Cell stand 14a
Has a connector portion 1 for mounting the tube 32 on its side surface.
4d is fixed, and a hole 14e having a closed lower end is provided inside.

Further, a cylindrical projection 14f projecting downward is integrally formed on the lower end surface of the cell base 14a, and the lower end of the cylindrical projection 14f is the load of the electronic balance unit 16 of the electromagnetic balance type. The load of the water collecting device 14 is transmitted to the electronic balance unit 16 by being brought into contact with the upper end of the transmission shaft 16 a. The cell body 14c has a substantially hollow cylindrical shape with open upper and lower ends, and has a small-diameter insertion portion that is inserted into the hole 14e of the cell base 14a with packings 14g installed in multiple stages. 14h is integrally formed at the lower end.
A mesh 14i for preventing the adsorbent 14b from falling off is inserted inside the cell body 14c, and the packing 14 is provided on the upper end side.
The cap 14k holding j is attached.

The cap 14k is provided at its upper end with a plurality of symmetrically arranged discharge ports 14l oriented in the horizontal direction. Next, an operation for measuring the water content of the object X to be measured with the water content meter having the above configuration will be described. In the measurement of the water content of the object to be measured X, first, the object to be measured X is moved to the heating zone a of the heating pipe 12 a of the heating unit 12 by the moving mechanism 22.
Is located through. Then, in this state, the carrier gas A is introduced into the inside of the heating tube 12a through the inlet 12h, and the heater 12c of the heating unit 12 is energized,
Be heated.

Moisture vaporized and separated from the object to be measured X by heating and vaporized substances other than water are carried in the carrier gas A and are discharged as the carrier gas B from the through hole 12i. The carrier gas B thus derived is introduced into the filter 18, and vaporized substances other than vaporized water carried in the carrier gas B are adsorbed by the adsorbent filled in the filter 18, It is removed from the carrier gas B.

The carrier gas from which vaporized substances other than vaporized moisture have been removed is then introduced into the moisture collector 14, and the vaporized moisture is adsorbed and held by the adsorbent 14b filled in the cell body 14c. The amount of water of the object X to be measured can be obtained by detecting the weight increased by the adsorbent 14b adsorbing and holding vaporized water by the electronic balance unit 16.

The moisture meter constructed as described above does not require special skill and is easy to operate, and the moisture collector 14 is connected to the flexible tube 32 for introducing the carrier gas B. And the cell base 14a connected to the load transmission shaft 16a of the balance unit 16 for measuring the amount of vaporized water through the cylindrical projection 14f and the cell base 14a, which is connected to the cell base 14a so as to communicate the vaporized water inside. Adsorbent 14b to collect
Since the adsorbent 1 is provided with the cell body 14c filled with the and the cap 14k for closing the cell body 14c.
The following effects can be obtained when 4b is replaced and when measurement is restarted.

That is, when the adsorption function of the adsorbent 14b is exhausted and it becomes necessary to replace it, the cell body 1
4c can be separated from the cell base 14a, the cap 14k can be removed, and the adsorbent 14b in the cell body 14c can be replaced. Therefore, the replacement work is very simple. Further, when the replacement work of the adsorbent 14b is completed and the measurement is restarted, the measurement can be restarted immediately if the cell body 14c is connected to the cell base 14a again, and when the adsorbent 14b is replaced. Since no change occurs in the flexible tube 32 for introducing the carrier gas, it is not necessary to wait until the stress of the tube 32 is relieved, and the measurement efficiency is greatly improved.

Further, in the water collecting device 14 of this embodiment,
Since the cap 14k that closes the cell body 14c is oriented in the horizontal direction and is provided with a plurality of discharge ports 14l at symmetrical positions with respect to the center of the cell body 14c, the carrier gas discharged from the discharge port 14l. The discharge reaction force of 1 is offset, the fluctuation of the measurement value of the balance unit 16 due to the reaction force at the time of discharging the carrier gas is eliminated, and the measurement accuracy is improved.

[0031]

As described above in detail in the embodiments,
According to the moisture collecting apparatus for a moisture meter of the present invention, the measurement can be restarted immediately after replacing the adsorbent whose adsorption function has been exhausted, and the efficiency of the measurement is improved. Further, according to the configuration of claim 2, the discharge reaction force at the time of discharging the carrier gas is offset, so that the measurement accuracy of the moisture meter is improved.

[Brief description of drawings]

FIG. 1 is a functional configuration block diagram of a moisture meter to which the present invention is applied.

FIG. 2 is a sectional view of a heating unit and a filter of the same moisture meter.

FIG. 3 is an exploded perspective view of a moisture collection device of the moisture meter.

FIG. 4 is a cross-sectional view of a moisture collecting device of the moisture meter.

[Explanation of symbols]

 10 Gas Introducing Section 10c Desiccator Unit 10e Flow Sensor 12 Heating Section 12a Heating Tube 12c Heater 12h Inlet 14 Moisture Collecting Device 14a Cell Platform 14b Adsorbent 14c Cell 14k Cap 16 Electronic Balance Unit 18 Filter 32 Tube A Carrier Gas B Carrier Gas C Mixed gas X DUT

Claims (2)

[Claims] 1. A moisture meter for measuring an amount of vaporized moisture by collecting a vaporized moisture from the carrier gas discharged from the heating unit by introducing a carrier gas from the outside to heat an object to be measured by the heating unit. In the water collecting device, the flexible tube for introducing the carrier gas is connected,
And, a cell base that is connected to a balance unit that measures the amount of vaporized water, and a cell body that is installed in communication on the cell base and is filled with an adsorbent that traps the vaporized water inside.
A moisture collecting device for a moisture meter, comprising a cap for closing the cell body. 2. The water for a moisture meter according to claim 1, wherein the cap has a plurality of outlets that are oriented in a horizontal direction and are symmetrically arranged with respect to the center of the cell body. Minute collector.