JPH05126713A - Carbon dioxide gas sensor - Google Patents

Abstract

PURPOSE:To obtain a carbon dioxide gas sensor which can detect concentration of carbon dioxide gas within a liquid phase easily and in a short time and can be used in a system where a liquid is flowing. CONSTITUTION:A carbon dioxide gas sensor detects concentration of carbon dioxide gas within a liquid phase according to fluctuation of pressure of a closed space when carbon dioxide gas which is dissolved into the liquid phase is discharged into the closed space. Then, it is provided with a liquid supply port 30 which can be opened and closed freely and a liquid drain port 40 which can be opened and closed while being linked to opening/closing of the liquid supply port 20. A pressure sensor 70 and an air supply port 20 with a valve 22 are provided at a position which is higher than the liquid supply port 30 and the liquid drain port 40 and a cell 10 with an ultrasonic vibrator 60 on a bottom surface is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a carbon dioxide gas sensor for detecting the concentration of carbon dioxide gas dissolved in a liquid phase, and more specifically, when the carbon dioxide gas dissolved in the liquid phase is released into a closed space. The present invention relates to a carbon dioxide gas sensor for detecting the concentration of carbon dioxide gas in a liquid phase from the pressure fluctuation in the closed space, and for example, to a carbon dioxide gas sensor used for detecting the concentration of carbon dioxide gas in a carbonated beverage, a carbonated spring, or the like.

[0002]

2. Description of the Related Art As a carbon dioxide sensor for detecting the concentration of carbon dioxide in a liquid phase, one which adds a chemical to the liquid phase to adjust the pH of the liquid phase and electrochemically detects the concentration of carbon dioxide, Chemicals are added to the liquid phase to release dissolved carbon dioxide, and the concentration of carbon dioxide is detected from the heat conduction of the gas phase from which carbon dioxide was released. The concentration of carbon dioxide is determined by infrared absorption in the liquid phase. What is detected is known.

However, the carbon dioxide gas sensor as described above has a problem that the operation is very complicated and that it takes a lot of time and labor to use it, and the concentration of carbon dioxide gas in the liquid phase can be detected by a simpler operation. A carbon dioxide sensor is required. In particular, it is a carbon dioxide sensor that measures the concentration of carbon dioxide in a liquid such as a carbonated spring that constantly flows in a system in which the liquid is flowing, and the concentration of carbon dioxide can be detected by a simple operation. A carbon dioxide sensor is required.

[0004]

In view of the above circumstances, the present invention is a carbon dioxide gas sensor capable of detecting the concentration of carbon dioxide gas in a liquid phase easily and in a short time, in a system in which a liquid is flowing. It is an object to provide a carbon dioxide sensor that can be used.

[0005]

According to the present invention, a closed space 9 is provided when carbon dioxide gas dissolved in a liquid phase is released into the closed space 90.
In a carbon dioxide sensor that detects the concentration of carbon dioxide in the liquid phase from a pressure fluctuation of 0, a liquid supply port 30 that can be opened and closed and a liquid discharge port 40 that opens and closes in conjunction with the opening and closing of the liquid supply port 30.
And a cell 10 having a pressure sensor 70 and an air supply port 20 with a valve 22 at a position higher than the liquid supply port 30 and the liquid discharge port 40, and an ultrasonic transducer 60 on the bottom surface. Is a carbon dioxide sensor.

[0006]

The carbon dioxide sensor of the present invention comprises an air supply port 20 with a valve 22, a liquid supply port 30 which can be opened and closed, and this liquid supply port 3.
Since the cell 10 having the liquid discharge port 40 that opens and closes in conjunction with the opening and closing of 0 is provided, the cell 10 is controlled by controlling the opening and closing of the valve 22 and the opening and closing of the liquid supply port 30 and the liquid discharge port 40.
A closed space 90 containing a liquid phase and a gas phase can be formed therein. When the ultrasonic transducer 60 provided in the cell 10 is driven in the closed space 90, the carbon dioxide gas dissolved in the liquid phase is released into the gas phase in a short time by the action of the generated ultrasonic waves. Pressure fluctuations in the closed space 90 occur depending on the carbon dioxide concentration in the liquid phase. The pressure fluctuation in the closed space 90 can be easily detected by the action of the pressure sensor 70 provided in the cell 10. Therefore, according to the carbon dioxide sensor of the present invention, the opening / closing of the valve 22 and the liquid supply port 30 and the liquid discharge are performed. By controlling the opening / closing of the outlet 40 and the driving of the ultrasonic transducer 60, the concentration of carbon dioxide gas in the liquid phase can be easily detected in a short time.

The carbon dioxide sensor of the present invention is provided with a driving device in which the cell 10 has a first plug 51 fitted to the liquid supply port 30 and a second plug 52 fitted to the liquid discharge port 40. An operating shaft 50 is attached, and when the first plug 51 closes the liquid supply port 30, the second plug 52 closes the liquid discharge port 40 at the same time, and when the first plug 51 opens the liquid supply port 30, at the same time. In the case of a carbon dioxide sensor in which the first stopper 51 and the second stopper 52 are provided on the shaft 50 in a positional relationship where the second stopper 52 opens the liquid outlet 40, the liquid supply port is activated by the operation of the shaft 50. The opening and closing of 30 and the liquid outlet 40 are performed in conjunction with each other.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings. FIG. 1 is a sectional view of a carbon dioxide sensor according to an embodiment of the present invention.

As shown in FIG. 1, the carbon dioxide sensor of the present invention has a pressure sensor 70 and an air supply port 20 with a valve 22 on its ceiling surface, and a liquid supply port 30 which can be opened and closed on its side surface. Further facing the liquid supply port 30, the liquid supply port 30
The cell 10 having the liquid discharge port 40 that opens and closes in conjunction with the opening and closing of the cell 10 and the ultrasonic transducer 60 on the bottom surface is provided. An electromagnetic valve is used as the valve 22 in this embodiment, but there is no particular limitation as long as it can be opened and closed. The pressure sensor 70 is preferably of a type that does not interfere with the contact with liquid, for example, a "diffusion type semiconductor pressure sensor PS" manufactured by Copal.
7 ”or the like can be used.

Further, in the present embodiment, the diameter of the liquid discharge port 40 is set so that the discharge amount of the liquid exceeds the supply amount of the liquid, so that the air is easily introduced into the cell 10. The diameter is larger than the diameter of the supply port 30. If the air is forcedly sent into the cell 10 using a pump or the like, the diameter of the liquid discharge port 40 need not be larger than the diameter of the liquid supply port 30 in this way.

Further, in the present embodiment, a pump 80 is connected to the liquid supply port 30 via a tube 81, and the cell 1
It works to send liquid to 0. In addition, this pump 8
0 may be omitted when the liquid pressure of the introduced liquid is high,
The place where the pump 80 is attached is the liquid outlet 40.
It may be a place connected to the pump 80, in which case the pump 80 works to forcibly discharge the liquid.

In this embodiment, the cell 10 is used as a means for opening and closing the liquid supply port 30 and the liquid discharge port 40 in conjunction with each other.
The first stopper 51 fitted to the liquid supply port 30 and the liquid discharge port 4
A shaft 50 actuated by a drive device (not shown) having a second plug 52 that fits into 0 is attached. When the shaft 50 is actuated by a driving device (not shown) and the first plug 51 closes the liquid supply port 30, the second plug 52 closes the liquid discharge port 40 at the same time, and the first plug 51.
The first stopper 51 and the second stopper 52 are provided on the shaft 50 so that the second stopper 52 opens the liquid outlet 40 at the same time when the liquid outlet 30 is opened.

In the present invention, the shaft 50 is used as a means for opening and closing the liquid supply port 30 and the liquid discharge port 40 in conjunction with each other.
It is also possible to adopt means other than the means described in. For example, it is possible to employ means for providing electromagnetic valves respectively adjacent to the liquid supply port 30 and the liquid discharge port 40, and operating these electromagnetic valves in conjunction with each other by an external control circuit.

In this embodiment, the drive of the shaft 50 and the valve 2
The control of opening / closing 2 and driving of the ultrasonic transducer 60 and driving of the pump 80 is automatically performed by an external circuit (not shown).

Next, the principle of detecting the concentration of carbon dioxide gas in the carbon dioxide gas sensor of this embodiment will be described with reference to FIGS. 2 and 3. FIG. 2 shows a state in which the carbon dioxide sensor of the present invention is installed in a system in which liquid is always continuously supplied, and a state in which the concentration of carbon dioxide has not been detected yet. In the state of FIG. 2, the valve 22 for controlling the supply of air, the liquid supply port 30, and the liquid discharge port 40 are opened, the pump 80 is operating, and the liquid is sent into the cell 10 by the pump 80. There is. The diameter of the liquid outlet 40 is equal to the diameter of the liquid supply port 30.
Since it is larger than the diameter of the liquid, the liquid is in a reduced pressure state in the cell 10. Therefore, air flows into the cell 10 via the valve 22 and the air supply port 20. That is, in the state of FIG. 2, the liquid and the air coexist in the cell 10, and these are constantly replaced. At this time, the ultrasonic transducer 60 is stopped.

Next, the state of FIG. 2 shifts to the state of FIG. In FIG. 3, the valve 22 is closed from the state shown in FIG. 2, and a driving device (not shown) is driven to operate the shaft 50 so that the liquid supply port 30 is the first plug 51 and the liquid discharge port 40 is the second. Stopper 52
Shows a state in which a closed space 90 is formed in the cell 10 by simultaneously closing with. In the state shown in FIG. 3, the closed space 90
A liquid phase and a gas phase are formed inside, and when the ultrasonic oscillator 60 is driven in this state, vibration is imparted to the liquid phase by the ultrasonic waves generated by the drive of the ultrasonic oscillator 40, The carbon dioxide gas dissolved in the liquid phase is rapidly released into the gas phase, and the pressure in the closed space 90 rises. The concentration of the carbon dioxide gas dissolved in the liquid phase is detected by detecting the increase value of the pressure at this time with the pressure sensor 70.

When the detection of the concentration of carbon dioxide is completed, the driving of the ultrasonic transducer 60 is stopped and the valve 22 for controlling the air supply,
The liquid supply port 30 and the liquid discharge port 40 are opened and returned to the state of FIG.

By repeating this series of operations, the concentration of carbon dioxide in the liquid phase can be easily detected any number of times.

[0019]

The carbon dioxide gas sensor of the present invention comprises an ultrasonic transducer 60, a pressure sensor 70, and an air supply port 2 with a valve 22.
0, a cell 10 having a liquid supply port 30 that can be opened and closed and a liquid discharge port 40 that opens and closes in conjunction with the opening and closing of the liquid supply port 30.
Since it is configured to include, it is possible to easily detect the carbon dioxide concentration in the liquid phase simply by controlling the opening / closing of the valve 22, the liquid supply port 30, the liquid discharge port 40 and the driving of the ultrasonic vibrator 60. And it can be performed in a short time. Further, the carbon dioxide sensor of the present invention can be used in a system in which a liquid is flowing.

When the carbon dioxide gas sensor of the present invention is constructed such that the liquid supply port 30 and the liquid discharge port 40 are opened and closed by the operation of the shaft 50,
There is an effect that the means for opening and closing the liquid supply port 30 and the liquid discharge port 40 in conjunction with each other can be achieved with a very simple configuration.

[Brief description of drawings]

FIG. 1 is a schematic view showing a cross section of a carbon dioxide sensor according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing the operating principle of a carbon dioxide sensor according to an embodiment of the present invention.

FIG. 3 is a schematic diagram showing the operating principle of the carbon dioxide sensor according to the embodiment of the present invention.

[Explanation of symbols]

 10 Cell 20 Air Supply Port 22 Valve 30 Liquid Supply Port 40 Liquid Discharge Port 50 Shaft 51 First Plug 52 Second Plug 60 Ultrasonic Transducer 70 Pressure Sensor 80 Pump 90 Sealed Space

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Joji Kawagoe 1048, Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Works Co., Ltd. (72) Shoichi Morii, 1048, Kadoma, Kadoma City, Osaka Matsushita Electric Works Co., Ltd. (72) Inventor Shin Tsutsugu 1048, Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Works Co., Ltd. (72) Takashi Hatai, 1048, Kadoma, Kadoma City, Osaka Matsushita Electric Works Co., Ltd. (72) Inventor Masanori Fukui 1048, Kadoma, Kadoma-shi, Osaka Matsushita Electric Works Co., Ltd.

Claims (2)

[Claims] 1. A carbon dioxide gas dissolved in a liquid phase is a closed space 9
In a carbon dioxide sensor that detects the concentration of carbon dioxide in the liquid phase from the pressure fluctuation in the closed space 90 when it is discharged to 0,
It has a liquid supply port 30 that can be opened and closed and a liquid discharge port 40 that opens and closes in conjunction with the opening and closing of the liquid supply port 30.
A carbon dioxide sensor having a pressure sensor 70 and an air supply port 20 with a valve 22 at a position higher than 0 and the liquid discharge port 40, and a cell 10 having an ultrasonic transducer 60 on the bottom surface. 2. The cell 10 has a first plug 51 fitted to the liquid supply port 30 and a second plug 52 fitted to the liquid discharge port 40.
And a shaft 50 which is driven by a drive device is attached.
When the first plug 51 closes the liquid supply port 30, at the same time the second plug 52 closes the liquid discharge port 40, and then the first plug 51.
The first stopper 51 and the second stopper 52 are provided on the shaft 50 in such a positional relationship that the second stopper 52 opens the liquid outlet 40 at the same time when the liquid outlet 30 is opened. Item 2. The carbon dioxide sensor according to item 1.