JPS5810139Y2 - diaphragm electrode - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a diaphragm electrode used for measuring the concentration of dissolved oxygen.

An internal liquid is contained in the gap between the internal electrode part of the diaphragm electrode and the measurement electrode part.

In conventional diaphragm electrodes, a hole communicating with the internal liquid chamber is formed in the measurement electrode part, and the internal liquid is injected into the internal liquid chamber through this hole using a syringe.

For this reason, there were disadvantages in that not only did it take a long time to assemble the diaphragm electrode, but also a large amount of bubbles (air) remained in the internal liquid chamber.

The purpose of the present invention is to eliminate these drawbacks of conventional devices.

The present invention will be explained in detail below with reference to the drawings.

The figure is a partial sectional view showing an embodiment of a diaphragm electrode for measuring dissolved oxygen concentration to which the present invention is applied.

In the figure, 11 is a chain electrode, 12 is a cylindrical block that holds the chain electrode 11 inside, and 13 is a diaphragm made of hexafluoroethylene.

14 is a sealing O-ring attached to the locking part of the cylindrical block 12; 15 is an annular tension band made of rubber or the like; 16
is a fixing O-ring.

The chain electrode 11 and the cylindrical block 12 are fixed with adhesive.

A plurality of liquid junction holes 112 are provided in the head 111 of the chain electrode 11 .

The diaphragm 13 is connected to the head 111 of the chain electrode 11 and the O for sealing.
It is arranged so as to cover the ring 14.

This diaphragm 13 is fixed to the cylindrical block 12 with a tension band 15 and a fixing O-ring 16.

These chain electrodes 11. The cylindrical block 12, the diaphragm 13, the sealing O-ring 14, the tension band 15, and the fixing O'J ring 16 constitute the measurement electrode section 1.

21 is a lead electrode, 22 is a support block covering one end of the lead electrode 21, and 23 is a pin.

The support block 22 is made of insulating material, and the lead electrode 21
It is attached with adhesive.

The pin 23 is made of stainless steel, and its contact portion 23
1 is provided with slots to provide elasticity.

Further, a threaded portion 232 is cut at the other end.

The pin 23 penetrates the hole 221 of the support block 22 and connects to the lead electrode 21 with the threaded portion 232.
Electrical continuity with 1 has been obtained.

Since this screw connection alone does not provide sufficient mechanical strength, the pin 23 is also fixed to the support block 22 with adhesive.

The hexagonal column portion 233 at the center of the bottle 23 is for enabling screw tightening with a spanner.

The above lead electrode 21. Support block 22 and pin 23 constitute internal electrode section 2 .

31 is a main block made of insulating material, 32 is a contact part 321
33 is a ring-shaped disc made of silver, 34
is a lead wire that passes through the main block 31 and is connected to the annular disk 33.

A holding portion 311, which is a hole for accommodating the internal electrode portion 2, is formed in the center of the main block 31.

Further, a hole 312 communicating with the pin socket 32 is formed at the bottom of the holding portion 311 .

Furthermore, the internal liquid chamber 4, which is the gap between the measurement electrode part 1 and the internal electrode part 2, is connected to an internal liquid flow path 31 formed in the body 31.
3 allows communication with the outside world.

35 is an internal liquid flow path 313 arranged in the internal liquid flow path 313;
It is a stopper for sealing.

Here, a configuration is shown in which the O-ring 351 is held down by a bolt 352 connected to a thread cut in the internal liquid flow path 313.

Main block 31 above. Pin socket 32, annular disk 3
3. The lead wire 34 and the plug 35 constitute the body 3.

5.6 is an O-ring.

O-ring 5. is incorporated into a groove 222 on the inner circumference of the support block 22.

The O-ring 6 is installed in a groove 314 on the circumference of the main block 31.

The axial length of the inner surface 121 of the cylindrical block 12 that slides on the O-ring 6 is selected to be approximately the same as the axial length of the threaded portion Y in which the measurement electrode portion 1 and the body 2 actually fit.

The procedure for assembling the measurement electrode section 1, internal electrode section 2, and body 3 and filling the internal liquid 7 as described above is as follows.

First, the internal electrode section 2 is inserted into the holding section 311 of the main block 31.

As a result, the pin 23 is inserted into the pin socket 32, and the lead electrode 21 and the pin socket 32 are electrically connected.

Also, the gap between the joint surfaces of the internal electrode part 2 and the body 3 is O
It is sealed by ring 5.

Next, the internal liquid 7 is poured into the measurement electrode section 1 .

The measurement electrode 1 is then pressed against the main block 31 from below in the figure so as to wrap around the measurement electrode section 2.

In this state, the gap between the joint surfaces of the measurement electrode section 1 and the body 3 is sealed by the O-ring 6.

Therefore, rotate the measurement electrode part 1 and
As the length of the internal liquid chamber 4 increases, the volume of the internal liquid chamber 4 decreases.
The air in the internal liquid chamber 4 and the flow path 313 is pushed out from the flow path 313 together with the excess internal liquid 7.

After this screw tightening is completed, the channel 313 is sealed using a stopper 35 (Pol 352).

On the other hand, by tightening the screw, the end 11 of the chain electrode 11
3 and the annular disk 33 are in contact with each other, and the chain electrode 11 and the lead wire 3 are in contact with each other.
4 is electrically conductive.

In the above description, the diaphragm electrode for measuring dissolved oxygen concentration has been described, but the same applies to other diaphragm electrodes.

Further, although the plug 35 made of an O-ring 351 and a bolt 352 is shown to seal the flow path 313, other sealing means may be used.

In addition, although the length of the threaded portion Y and the length of the sliding inner surface 121 that fit together are selected to be approximately equal, this relationship may be selected depending on the amount of surplus internal liquid to be pushed out.

As explained above, according to the present invention, the internal liquid can be easily sealed without using a syringe or the like.

Moreover, no air bubbles or the like are generated in the internal liquid during encapsulation.

[Brief explanation of the drawing]

The figure is a partial sectional view showing an embodiment of a diaphragm electrode for measuring dissolved oxygen concentration to which the present invention is applied. DESCRIPTION OF SYMBOLS 1...Measurement electrode part, 2...Internal electrode part, 3...Body, 313...Internal liquid flow path, 35... Plug, 351...OIJ ring, 352...Bolt, 4...Internal liquid chamber, 7...Internal liquid.

Claims (1)

[Scope of utility model registration request] A measuring electrode section, an internal electrode section, a body to which these electrode sections are attached, an internal liquid chamber formed by the gap between the measuring electrode section and the internal electrode section and containing the internal liquid, and an interior connecting the internal liquid chamber with the outside. In a diaphragm electrode equipped with a liquid flow path and a sealing means for sealing the internal liquid flow path, the measurement electrode section is rotated and the volume of the internal liquid chamber is reduced, so that air inside the internal liquid chamber and A diaphragm electrode characterized in that the surplus internal liquid is configured to flow out to the outside through the internal liquid flow path during calibration.