JP4953093B2 - pH meter - Google Patents

Description

  The present invention relates to a PH meter for measuring the pH of a measurement liquid.

  Prior art documents related to the PH meter include the following.

Japanese Utility Model Publication No. 01-058156 JP 09-178698 A

FIGS. 8A and 8B are explanatory views of a main part configuration of a conventional example that is generally used conventionally. FIG. 8A is a bottom view, FIG. 8B is a cross-sectional view of the A-O-B main part of FIG. It is an AOC main part sectional view of a).
In the figure, 1 is a glass electrode, 2 is a liquid junction made of porous ceramics, 3 is a liquid earth made of titanium, 4 is a cable for transmitting an output signal detected by the glass electrode 1 or the like, and 5 is a body of a PH meter electrode , 6 are reference electrodes, 7 is a temperature sensor made of a thermistor, and 8 is a KCl solution chamber containing a KCl solution.
Here, the body 5, the KCl solution chamber 8 containing the KCl solution, and the liquid junction part 2 constitute an internal liquid supply part.

  In the above configuration, when the tip of the body 5 is immersed in the measurement liquid, the pH of the measurement liquid is detected by the glass electrode 1 or the like.

Such an apparatus has the following problems.
The pH of the internal solution in the KCl solution chamber 8 can be measured by flowing out little by little through the liquid junction 2. If the liquid junction 2 is clogged with dirt, it cannot be measured well. Therefore, it is necessary to replace parts and clean them and to perform maintenance regularly.

Further, when the pressure of the measurement liquid is high, it is necessary to pressurize the internal liquid from the outside in order to cause the internal liquid to flow out. The pressurizing mechanism for that is expensive.
When the liquid junction part 2 is immersed deeply in the measurement liquid, the pressure of the measurement liquid becomes higher than the pressure of the internal liquid.

The object of the present invention is to solve the above-mentioned problems, there is no fear of clogging of the liquid junction, no internal liquid pressurizing device is required, there is no variation in the function of the liquid junction, and the outflow amount of the internal liquid It is to provide a p H meter is changed.

To achieve this object, the present invention, the p H meter according to claim 1,
In p H meter having a reference electrode having an internal liquid supply unit for supplying the internal liquid in the measurement fluid, and a case where the elastic body is incorporated for pressing the internal solution and the internal solution, the internal provided in the case An internal liquid flow path through which the liquid flows out, and a piezoelectric element having both ends fixed to the flow path wall of the internal liquid flow path. p H meter, characterized by comprising an internal liquid supply part having a jetting controller that the internal liquid by opening and closing the road to control a violent the outside.

In p H meter according to claim 2 of the present invention, the p H meter according to any one of claims 1 to 3,
A nozzle is provided in the external opening of the internal liquid channel.

In p H meter according to claim 3 of the present invention, the p H meter according to claim 1,
A porous body is provided in an external opening of the internal liquid channel.

In p H meter according to claim 4 of the present invention, the p H meter according to any one of claims 1 to 3,
An internal liquid replenishing tank connected to the case is provided.

In p H meter according to claim 5 of the present invention, the p H meter according to any one of claims 1 to 4,
The elastic body includes a bellows with a built-in spring.

According to claim 1 of the present invention, there are the following effects.
Ejecting internal liquid. Thus controlled, p H meter can be easily fixed to runoff internal solution is obtained.
Ejecting internal liquid. Thus controlled, there is no clogging of the liquid junction due to contamination, instruction drift, p H meter is a problem that the response time is slow does not occur is obtained.

The liquid junction made of porous ceramics varies in outflow amount, and depending on the raw material lot, the outflow amount may not fall within the standard value and must be discarded, but in the present invention, the outflow amount is constant. because it controls, no variations p H meter to obtain performance.

To be able to actively control the outflow amount of the internal liquid, p H meter can be optimized outflow internal solution to suit the application can be obtained.
If the measured fluid pressure is higher than the pressure inside the liquid, conventionally, it was necessary pressure device internal solution, the present invention, since the ejected, pressure device is not required p H A total is obtained.
Incidentally, p H meter maintenance by cartridge the internal liquid replenishment portion becomes easier to obtain.

According to claim 2 of the present invention, there are the following effects.
Since the nozzle outside the opening of the internal fluid flow path is provided, p H meter can be obtained which can easily be injection-shaped into various forms.

According to claim 3 of the present invention, there are the following effects.
Since the porous body is provided outside the opening of the internal fluid channel, p H meter can be dispersed small amounts infinitesimal internal solution is obtained.

According to claim 4 of the present invention, there are the following effects.
Since the internal liquid replenishment tank connected to the case is provided, the internal liquid need not be replenished for a long time. Moreover, even if the internal fluid is reduced, since no possible space, the internal liquid when replenishing not required pressurizing pressure device, at low cost, p H meter can lengthen the supply period of the internal liquid obtained It is done.

According to claim 5 of the present invention, there are the following effects.
Elastic member, since bellows spring is built is provided, inexpensive p H meter configuration is simple is obtained.

Hereinafter, the present invention will be described in detail with reference to the drawings.
FIG. 1 is a diagram illustrating the configuration of the main part of one embodiment of the present invention, FIG. 2 is a diagram illustrating the configuration of the main part of FIG. 1, and FIGS. 3 and 4 are diagrams illustrating the operation of FIG.
In the figure, the same symbols as those in FIG. 8 represent the same functions.
Only the difference from FIG. 8 will be described below.

  In the present invention, the structure in which the internal liquid oozes out from the liquid junction portion 2 in the conventional example shown in FIG.

In FIG. 1, the internal liquid supply unit 11 includes a case 12, an internal liquid flow path 13, and an ejection control means 14.
As shown in FIG. 2, the case 12 includes an internal liquid 121 and an elastic body 122 that presses the internal liquid.
In this case, the elastic body 122 has a bellows 123 in which a spring 124 is incorporated.
The internal liquid channel 13 is attached to the case 12, and the internal liquid 121 flows out to the outside.
Of course, the internal liquid flow path 13 may be composed of several instead of one.

The ejection control means 14 is provided in the internal liquid flow path 13 and controls the ejection of the internal liquid 121 to the outside.
In this case, the ejection control means 14 uses a piezoelectric element.
The ejection control means 14 may be a heater that generates bubbles.

  FIG. 2 shows the internal liquid supply unit 11 in an easy-to-understand manner and a schematic diagram. When the internal liquid supply unit 11 is incorporated in the body 5, the arrangement of the case 12, the internal liquid flow path 13, the ejection control means 14, and the like are arranged. Of course, the relationships come differently.

In the above configuration, as shown in FIG. 2, the internal liquid 121 is pressurized and supplied into the case 12. The elastic body 122 contracts by the pressure at this time.
As shown in FIG. 2, after the internal liquid 121 is press-fitted, the internal liquid flow path 13 is closed by the ejection control means 14, in this case, the piezoelectric element.
As the piezoelectric element that is the ejection control means 14 expands and contracts, a small amount of the internal liquid 121 is continuously ejected. As a result, the pH electromotive force generated in the glass film can be measured, and the pH can be measured.

When the internal liquid 121 decreases, the elastic body 122 extends, so that there is no space in the internal liquid storage part. Thereby, it is possible to prevent bubbles from entering the internal liquid 121.
The ejection control means 14 may use a heater instead of the piezoelectric element to generate bubbles and eject the internal liquid 121.

As a result, since the internal liquid 121 is jetted out and controlled, a PH meter that can easily make the outflow amount of the internal liquid 121 constant is obtained.
Since the internal liquid 121 is ejected and controlled, the internal liquid supply unit 11 is not clogged with dirt, and a PH meter that does not cause problems of instruction drift and slow response time can be obtained.

The liquid junction part 2 made of porous ceramics has a variation in the outflow amount, and depending on the raw material lot, the outflow amount may not be within the standard value and has to be discarded. In the present invention, the outflow amount is constant. Therefore, a PH meter with consistent performance can be obtained.
Since the outflow amount of the internal liquid 121 can be positively controlled, a PH meter that can optimize the outflow amount of the internal liquid 121 according to the application is obtained.

In the case where the measurement liquid pressure is higher than the pressure of the internal liquid 121, conventionally, a pressurizing device for the internal liquid 121 from the outside was necessary. However, in the present invention, since the jetting is performed, the pressurizing device is An unnecessary PH meter can be obtained.
It should be noted that a PH meter that facilitates maintenance can be obtained by making the internal liquid replenishment portion into a cartridge.

  Since the ejection control means 14 uses a piezoelectric element, it is possible to obtain a PH meter that can be simply configured, has few failures, is robust and can be easily downsized.

If a heater that generates bubbles is used, the ejection control means 14 can be further simplified in configuration, and a robust PH meter with few failures can be obtained.
Since the elastic body is provided with the bellows 123 in which the spring 124 is built, the configuration is simplified and an inexpensive PH meter can be obtained.

FIG. 5 is an explanatory view showing the configuration of the main part of another embodiment of the present invention.
In FIG. 5, a nozzle 15 is provided in the external opening of the internal liquid channel 13.

  As a result, since the nozzle 15 is provided in the external opening of the internal liquid flow path 13, a PH meter can be obtained that can easily change the injection shape into various forms.

FIG. 6 is an explanatory view of the main part configuration of another embodiment of the present invention.
In FIG. 6, a porous body 16 is provided in the external opening of the internal liquid channel 13.

  As a result, since the porous body 16 is provided in the external opening of the internal liquid flow path 13, a PH meter capable of accurately supplying a very small flow rate of the internal liquid 121 is obtained.

FIG. 7 is an explanatory view of the main part configuration of another embodiment of the present invention.
In FIG. 7, an internal liquid supply tank 17 is connected to the case 12.

  As a result, since the internal liquid supply tank 17 connected to the case 12 is provided, the internal liquid 121 need not be replenished for a long period of time. In addition, even if the internal liquid 121 is reduced, no space is created. Therefore, when the internal liquid 121 is replenished, a pressurizing device that pressurizes from the outside is not necessary, and the replenishment period of the internal liquid 121 can be extended at a low cost. A PH meter is obtained.

The above description merely shows a specific preferred embodiment for the purpose of explanation and illustration of the present invention.
Therefore, the present invention is not limited to the above-described embodiments, and includes many changes and modifications without departing from the essence thereof.

It is principal part structure explanatory drawing of one Example of this invention. It is principal part structure explanatory drawing of FIG. It is operation | movement explanatory drawing of FIG. It is operation | movement explanatory drawing of FIG. It is principal part structure explanatory drawing of the other Example of this invention. It is principal part structure explanatory drawing of the other Example of this invention. It is principal part structure explanatory drawing of the other Example of this invention. It is structure explanatory drawing of the prior art example generally used conventionally.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Glass electrode 2 Liquid junction part 3 Liquid earth 4 Cable 5 Body 6 Reference electrode 7 Temperature sensor 8 KCl solution chamber 11 Internal liquid supply part 12 Case 121 Internal liquid 122 Elastic body 123 Bellows 124 Spring 13 Internal liquid flow path 14 Ejection control means 15 Nozzle 16 Porous material 17 Internal liquid supply tank

Claims (5)

In p H meter having a reference electrode having an internal liquid supply unit for supplying the internal liquid in the measuring fluid,
A case elastic body which presses the internal solution and the internal solution has been built,
An internal liquid flow path that is provided in this case and through which the internal liquid flows out;
A piezoelectric element having both ends fixed to the flow path wall of the internal liquid flow path is provided, and a central portion of the piezoelectric element opens and closes the internal liquid flow path by the expansion and contraction operation of the piezoelectric element, and the internal liquid is ejected to the outside. Ejection control means for controlling the operation,
P H meter, characterized by comprising an internal liquid supply part having a. Nozzle was provided at the external opening of the internal liquid channel
  The pH meter according to claim 1. A porous body was provided in the external opening of the internal liquid channel
  The pH meter according to claim 1. Internal liquid supply tank connected to the case
  The pH meter according to any one of claims 1 to 3, further comprising: The elastic body is a bellows with a built-in spring.
  The pH meter according to any one of claims 1 to 4, further comprising:

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