JP2014002116A - Dissolved gas concentration measuring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact and low-price dissolved gas concentration measuring device which can obtain a measurement result in a short time, and maintenance of which can be easily performed.SOLUTION: The dissolved gas concentration measuring device includes: a container 20 which is divided into a liquid phase part and a gas phase part, having predetermined capacity, and into the liquid phase part of which liquid to be measured containing dissolved gas is injected; and a pressure detection part 10 which is attachably/detachably mounted on the container 20, and, after the container 20 is held and vibrated by hand, measures pressure of the gas phase part. On the basis of a pressure value of the gas phase part when partial pressure of gas of the liquid phase part and the gas phase part is in equilibrium, dissolved gas concentration of the liquid to be measured is detected.

Description

  The present invention relates to a dissolved gas concentration measuring device for measuring a dissolved gas concentration in a liquid, and more particularly, to a dissolved carbon dioxide concentration measuring device for carbonated hot water for business baths and home baths and carbonated hot water for head spas.

  In general, in a carbonated spring, carbon dioxide gas is easily absorbed from the skin into the body, improving blood circulation. This can relieve lifestyle-related diseases, fatigue recovery, high blood pressure, coldness, stiff shoulders, and alleviate symptoms of cardiovascular diseases such as arteriosclerosis and heart disease, as well as relief of neuralgia, rheumatic pain, and It has been medically proven to have a wide range of effects such as improvement.

  According to the standards of the Ministry of Health, Labor and Welfare, the carbon dioxide dissolved concentration level to be approved as a medical machine is 1000 ppm or more. If the carbon dioxide concentration is 400 ppm, it is considered to have a medical effect. It is considered to be a satisfactory level of effectiveness.

  Conventionally, a dissolved gas concentration measuring device leaves a predetermined volume of space in a container, accommodates deaerated water as a liquid to be measured, seals the container, and then stirs the inside of the container with stirring means to measure Depending on the dissolved gas concentration of the liquid, the gas is dissolved in the liquid to be measured until the gas in the space is saturated and dissolved.

  As a result, the atmospheric pressure in the space portion becomes a negative pressure state, and the degree of the negative pressure is detected by the pressure detection means, so that how much the gas in the space portion is dissolved in the liquid to be measured, that is, It is calculated how much the dissolved gas concentration is (see, for example, Patent Document 1).

JP 7-218414 A

However, since the conventional concentration measuring apparatus has a structure provided with a stirring means in the container, the apparatus configuration is complicated and large, requires installation space, and is expensive.
In addition, the installation space for the container and the agitation means and regular maintenance are required, and it takes time to inject the liquid to be measured and the operation of the agitation means.

The present invention has been made in view of the circumstances as described above, and the object of the present invention is a dissolved gas concentration measuring instrument that is small and compact, can obtain measurement results in a short time, and can be easily maintained. Is to provide.
The above and other objects and novel features of the present invention will be apparent from the description of this specification and the accompanying drawings.

  In order to achieve the above object, the present invention is divided into a liquid phase part (50) and a gas phase part (40) having a predetermined volume, and a liquid to be measured in which a gas is dissolved is injected into the liquid phase part (50). A container (20) and a pressure detector (10) that is detachably attached to the container (20), grips the container (20) and manually vibrates, and then measures the pressure of the gas phase part (40) Based on the pressure value of the gas phase portion (40) when the partial pressure of the gas in the liquid phase portion (50) and the gas phase portion (40) is in an equilibrium state. The dissolved gas concentration is detected.

  Thereby, a small, compact and inexpensive measuring instrument comprising the container (20) and the pressure detector (10) can be obtained. In addition, the maintenance is facilitated, and the dissolved gas concentration in the liquid to be measured can be measured simply and quickly by simply grasping the container (20) and manually vibrating the liquid to be measured.

As a preferred embodiment, a mouth portion (22) into which the liquid to be measured is injected projects from the upper portion of the container (20), and the pressure detection portion (10) is screwed to the mouth portion (22). Is done.
Thereby, a pressure detection part (10) is mounted | worn only by screwing in a container (20).

In the said aspect, a cap (80) is fixed to the said pressure detection part (60), and the said cap (80) is screwed by the opening part (71) protrudingly provided by the upper part of the said container (70). The pressure detector (60) is attached to the container (70).
Thereby, the pressure detection part (60) is attached to the container (70) only by screwing the cap (80).

In the said aspect, the opening / closing valve which opens and closes the said mouth part (101) is mounted | worn with the opening | mouth part (101) of the said container (100), and the said opening / closing valve is the said pressure detection part (90) via a tube (130). ).
As a result, the pressure detector (90) can be placed separately, and the pressure detector (90) can be prevented from being overturned or dropped.

In the above aspect, the liquid to be measured dissolves carbon dioxide.
Thereby, the dissolved carbon dioxide gas concentration of carbonated spring is measured easily and in a short time.

  According to the present invention, since it is a compact and compact device configuration comprising a container and a pressure detection unit, it is inexpensive and easy to maintain. In addition, the dissolved gas concentration in the liquid to be measured can be measured easily and quickly only by manually vibrating the liquid to be measured in the container, and the measurement time can be shortened.

It is a disassembled perspective view of the dissolved gas concentration measuring device which concerns on one embodiment of this invention. It is explanatory drawing at the time of the vibration of the dissolved gas concentration measuring device of FIG. It is a partial cross section perspective view which shows the state in the container of FIG. (A) is a characteristic diagram of the dissolved carbon dioxide gas concentration and the pressure in the gas phase, (b) is a graph showing the relationship between the temperature of the carbonated spring and the pressure in the gas phase, and (c) is the dissolved oxygen gas concentration. FIG. 6 is a characteristic diagram of the pressure indication value of the pressure detection unit. It is a partial cross section figure of the dissolved gas concentration measuring device which concerns on other embodiment of this invention. It is a front view of the dissolved gas concentration measuring device which concerns on other embodiment of this invention.

  Hereinafter, an embodiment according to a dissolved gas concentration measuring device of the present invention will be described with reference to the drawings. FIG. 1 shows an exploded perspective view of a dissolved gas concentration measuring device. FIG. 2 is an explanatory view of the dissolved gas concentration measuring device during vibration, and FIG. 3 is a partial cross-sectional perspective view showing a state in the container after vibration. In the description of the embodiments, the same reference numerals are given to the same functions.

  The dissolved gas concentration measuring device shown in FIGS. 1 to 3 includes a Bourdon tube type pressure detection unit 10 and a plastic container 20 into which a liquid to be measured is injected. The pressure detection unit 10 has a display panel 12, and a pointer 13 pointing to the scale 12 a is provided at the center of the display panel 12.

  A lower portion of the display panel 12 has a cylindrical shape, and a support leg 11 in which a screw portion 14 is screwed on the outer peripheral surface of the cylindrical shape is provided. A ring-shaped gasket 16 is provided at the upper end portion of the screw portion 14. A sensor unit 15 with a diaphragm or the like is provided on the lower part of the support leg 11 so as to protrude.

  The container 20 has a bottomed cylindrical container body 21, and a small-diameter mouth portion 22 projects from an upper portion of the container body 21, and a screw portion 23 is screwed on the inner surface of the mouth portion 22. ing. Then, the pressure detection unit 10 is detachably attached to the container 20 by screwing the support leg 11 into the mouth part 22, and the inside of the container 20 is sealed by closely attaching the gasket 16 to the opening end of the mouth part 22. It is supposed to be.

  The container 20 can be gripped with one hand and can be vibrated up and down, left and right even with a sample carbonated spring (liquid to be measured), for example, having a volume and size of about 100 cc. (See FIG. 2).

  The inside of the container 20 is divided into a gas phase part 40 occupying a predetermined volume and a liquid phase part 50 into which carbonated springs are injected (see FIG. 3), and when the pressure detection unit 10 is screwed to the container 20, In order to prevent gas leakage from the threaded portion of the screw portion 14 and the screw portion 23, a sealing material (not shown) is bitten into the screw portion 14. The container main body 21 is provided with a scale 21a so that the amount of carbonated spring injected can be confirmed.

  When measuring the dissolved gas concentration of the carbonated spring using the dissolved gas concentration measuring device having such a configuration, first, the carbonated spring is injected into the liquid phase part 50 leaving the gas phase part 40 of the container 20. Then, the pressure detection unit 10 is screwed into the mouth portion 22 of the container 20, and finally the gasket 16 is brought into close contact with the opening end of the mouth portion 22, whereby the inside of the container 20 is sealed.

  In addition, the injection amount of carbonated spring is appropriately changed according to the dissolved carbon dioxide gas concentration. For example, when the dissolved carbon dioxide gas concentration is high, the carbonated spring injection amount is reduced, and the volume of the gas phase portion 40 is increased. When the dissolved carbon dioxide gas concentration is low, the carbonated spring injection amount is increased. The volume of the gas phase part 40 is reduced.

  The carbon dioxide dissolved in the carbonate spring in the container 20 is gradually released spontaneously into the gas phase portion 40 if left, and the pressure in the gas phase portion 40 is the partial pressure of the carbon dioxide gas in the gas phase portion 40. And the partial pressure of carbon dioxide in the carbonated spring rise until equilibrium is reached.

  The partial pressure of carbon dioxide gas in the gas phase part 40 at the time when the equilibrium state is reached, that is, the rising pressure in the gas phase part 40 is measured by the pressure detection unit 10. Then, from this measurement result, the dissolved carbon dioxide gas concentration is obtained with reference to the characteristic diagram of the dissolved carbon dioxide gas concentration and the pressure of the gas phase part 40 shown in FIG. FIG. 4A shows the relationship between the clean carbonated water concentration at a water temperature of 21 ° C. and the pressure in the gas phase part 40.

  By the way, it takes a long time for the dissolved carbon dioxide gas to be spontaneously released into the gas phase portion 40 and for the partial pressure of the carbon dioxide gas in the gas phase portion 40 and the liquid phase portion 50 to be in an equilibrium state. Therefore, in order to bring the carbon dioxide partial pressure into an equilibrium state in a short time, the container 20 is grasped with one hand, and is vigorously shaken up and down, left and right, for example, about 20 times in 4 to 5 seconds (see FIG. 2).

  That is, when the carbonated spring is vibrated, the activity of the dissolved carbon dioxide in the carbonated spring becomes active, the release of the dissolved carbon dioxide into the gas phase part 40 is promoted, and the partial pressure of the carbon dioxide is brought into an equilibrium state in a short time. can do.

  Moreover, the influence which the temperature change of carbonated spring (hot water) has on the pressure of dissolved carbon dioxide gas is about 3% or less with respect to the temperature change of about 10 ° C. of carbonated spring. For example, FIG. 4B shows the measurement result (pressure in the gas phase part 40) of the pressure detection unit 10 when the dissolved carbon dioxide gas concentration is 1000 ppm and the temperature of the carbonated spring is in the range of 36 to 42 ° C. That is, it can be seen that the measurement result of the pressure detector 10 is hardly affected by the temperature change of the carbonated spring.

Such a measuring device is used not only for measuring the concentration of dissolved carbon dioxide gas but also for measuring the concentration of dissolved oxygen gas, for example. FIG. 4C shows a characteristic diagram of the dissolved oxygen gas concentration of clean water and the pressure indication value of the pressure detection unit 10. That is, if the measurement value of the pressure detection unit 10 is known, based on FIG.
The dissolved oxygen gas concentration can also be determined.

  In addition, if the volume of the gas phase section 40 is too large, the pressure change during pressure measurement becomes small, and the pressure detection section 10 with high accuracy must be used. The total volume is set to about 1 to 10%, and preferably about 5%.

  The container 20 is not limited to plastic, and may be made of glass or metal, and may be a beverage plastic bottle. The pressure detection unit 10 may adopt a digital type as well as a Bourdon tube type, and may display in ppm units.

  As described above, the measuring instrument according to the present embodiment is configured to be small and compact by the container 20 and the pressure detection unit 10, and the simple operation in which the dissolved concentration of the carbonated spring only applies manual vibration to the carbonated spring in the container 20. Can be measured in a short time and at a low cost. Moreover, it is convenient to carry and easy to use, and can be easily maintained.

  The dissolved gas concentration measuring device according to the embodiment of the present invention has been described in detail above. However, the present invention is not limited to the dissolved gas concentration measuring device described in the above embodiment, and the claims of the present invention are provided. Various changes can be made in the design without departing from the spirit of the invention described in the above.

  For example, the dissolved gas concentration measuring device shown in FIG. 5 can be grasped with one hand, and a mouth portion 71 serving as a carbonated spring inlet is projected on the upper portion, and even when the carbonated spring is inserted, it is manually shaken vertically and horizontally. A container 70 in which a scale 72 for visually confirming the injection amount of carbonated spring is engraved in the height direction, a pressure detector 60 for measuring a partial pressure of dissolved carbon dioxide in the container 70, and a cap 80 It consists of and.

  The pressure detection unit 60 includes a support leg 61 that protrudes downward. The support leg 61 fits through a hole 81 formed in the center of the cap 80 and is fixed to the cap 80 by a nut 64. . A gasket 62 is mounted on the hole 81, and an O-ring 63 coaxial with the hole 81 is mounted in the cap 80.

  When measuring the atmospheric pressure in the container 70, the cap 80 is screwed into the outer peripheral portion of the mouth portion 71, so that the pressure detection unit 60 is detachably attached to the container 70, and the hole portion 81 and the support leg 61 are connected to the gasket 62. By sealing the cap 80 and the mouth portion 71 with the O-ring 63, the container 70 is sealed and its airtightness is maintained.

  The dissolved gas concentration measuring instrument shown in FIG. 6 includes a container 100 that can be held with one hand, a pressure detector 90, a cap 110, and a relay unit 120. The relay unit 120 and the pressure detector The unit 90 is connected via a tube 130. In the figure, reference numerals 91 and 122 denote connectors for connecting the tube 130 to the pressure detection unit 90 and the relay unit 120, respectively.

  The relay unit 120 includes a manual valve (not shown) and a valve opening / closing lever 121 that opens and closes the manual valve. When the manual valve is fully opened, the pressure detection unit 90 detects the atmospheric pressure in the container 100. It is like that.

  A hole (not shown) is formed in the center of the cap 110, and the relay unit 120 is fixed to the cap 110 through the hole, and the cap 110 protrudes from the top of the container 100. The relay unit 120 is detachably attached to the container 100 by being screwed to the portion 101.

  Further, the inside of the container 100 is sealed so as to be in a hermetically sealed state by a gasket 123 mounted on the cap 110 and an O-ring (not shown) mounted in the cap 80.

  When measuring the concentration of dissolved carbon dioxide, a predetermined amount of carbonated spring is injected into the container 100, and the cap 110 is screwed into the mouth part 101 of the container 100 with the valve opening / closing lever 121 fully closed, thereby connecting the relay unit. 120 is fixed to the container 100, and the inside of the container 100 is sealed. Then, the container 100 is manually shaken.

Next, after connecting the pressure detector 90 and the relay unit 120 via the tube 130, the valve opening / closing lever 121 is fully opened, and the atmospheric pressure in the container 100 is measured.
Since this measuring instrument is configured as a so-called separate type in which the container 100 and the pressure detection unit 90 are separately provided, the risk of the pressure detection unit 90 being accidentally overturned or dropped during measurement is reduced. can do.

  The measuring device according to the present embodiment can be applied not only to carbon dioxide gas and oxygen gas, but also to measurement of the concentration of dissolved gas that is dissolved in a liquid and released by hand shaking.

  The dissolved gas concentration measuring device according to the present invention is useful as a simple measuring device of dissolved gas concentration such as carbonated spring.

10, 60, 90 Pressure detection part 11, 61 Support leg 12 Display panel 12a, 21a, 72 Scale 13 Pointer 14, 23 Screw part 15 Sensor part 16, 62, 123 Gasket 20, 70, 100 Container 21 Container body 22, 71 101 Port 40 Gas phase 50 Liquid phase 63 O-ring 64 Nut 80, 110 Cap 81 Hole 91, 122 Connector 120 Relay unit 121 Valve opening / closing lever 130 Tube

Claims (5)

  A container into which a liquid to be measured, which is divided into a liquid phase part and a gas phase part of a predetermined volume and in which a gas is dissolved, is injected into the liquid phase part, and is detachably attached to the container, grips the container and manually vibrates Then, based on the pressure value of the gas phase portion when the partial pressure of the gas in the liquid phase portion and the gas phase portion is in an equilibrium state. A dissolved gas concentration measuring device for detecting the dissolved gas concentration of the liquid to be measured.   2. The dissolved gas concentration measurement according to claim 1, wherein a mouth part into which the liquid to be measured is injected protrudes from an upper part of the container, and the pressure detection part is screwed into the mouth part. vessel.   The cap is fixed to the pressure detection unit, and the pressure detection unit is attached to the container by screwing the cap into a mouth projecting from an upper part of the container. 1. The dissolved gas concentration measuring device according to 1.   The dissolved gas concentration according to claim 3, wherein an opening / closing valve for opening and closing the opening is attached to the opening of the container, and the opening / closing valve is connected to the pressure detection unit via a tube. Measuring instrument. The dissolved gas concentration measuring device according to any one of claims 1 to 4, wherein the liquid to be measured dissolves carbon dioxide.

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