JP4284466B2 - Liquid level detector for high temperature liquid - Google Patents

Description

  The present invention relates to a liquid level detection device for high-temperature liquid that can always reliably detect the level of a high-temperature liquid such as hot water existing in an opaque container such as a power generation boiler with a currently available inexpensive liquid level detector.

  In a conventional magnet-internal float type liquid level detector (liquid level gauge), as described in Patent Document 1 previously proposed by the present applicant, the upper and lower connecting pipes are connected to a liquid container to detect the liquid level. A magnet-incorporated float is suspended in a liquid existing in a nonmagnetic stand column that is continually connected to the inside of the float, while the float is placed in a nonmagnetic case with a see-through window plate that stands parallel to the outer peripheral surface of the stand column. 2. Description of the Related Art A liquid level detection device is known in which a large number of liquid level detection bodies using color-coded magnet rotors that rotate by receiving magnetic force from a magnet are pivoted at predetermined intervals.

Separately, as a device for naturally cooling the electrolyte of the storage battery, as described in Patent Document 2 below, a refrigerant evaporation heat exchange coil and a chimney inserted into the electrolyte in the electrolyte liquid container of the storage battery A liquid receiver is provided between the refrigerant condensation heat exchange coil disposed in the upper part and the heat generated by the refrigerant condensation heat exchange coil is air-cooled by the rising air current in the chimney, thereby reducing the heat of the electrolyte of the storage battery. A natural cooling device that is capable of natural air cooling by an endothermic action of a heat exchange coil for refrigerant evaporation is also well known.
Japanese Patent No. 2818753 JP 2003-254656 A

  Since the many liquid level detectors by the magnet rotor in the said patent document 1 are pivotally supported inside the sealed case where the heat inside the stand column standing in parallel with the outer peripheral surface of the stand column is difficult to escape, for example, a power generation boiler, etc. When used in a room temperature ambient air as a water level detector for hot water of about 330 ° C existing in an opaque container, both the stand column, the sealed nonmagnetic case, and the liquid level detector therein are about 300 ° C. As the temperature of the liquid level detector decreases or the magnetism weakens due to high temperature use, it follows a magnetic float that moves up or down slightly in response to changes in the water level of the hot water in the liquid container. As a result, the liquid level detector is not rotated and there is an essential and big problem that it is difficult to detect the essential liquid level.

  In order to solve this problem, a large number of liquid level detectors using the magnet rotor may be composed of expensive high-magnetism heat-resistant magnets such as rare earth magnets and alnico magnets having a Curie point of about 400 ° C. or higher. In this case, a large number of currently available low-cost liquid level detectors such as current general sintered ferrite molded magnet rotors and general magnetic force sensing type reed switches having a Curie point of about 300 ° C. or less that can be used inexpensively by mass production. It is necessary to change all of the above to the above-mentioned expensive high-magnetism heat-resistant magnet, and from the viewpoint of changing the pivot interval of many liquid level detectors in the non-magnetic case and the manufacturing cost of the liquid level detectors, the liquid level detector In addition, there is an essential problem that the liquid level detector using the high magnetic force heat-resistant magnet cannot be easily adopted.

  In addition, the conventional example of Patent Document 2 includes a refrigerant evaporation heat exchange coil inserted into an electrolyte solution in an electrolyte container of a storage battery, and a refrigerant condensation heat exchange coil disposed in an upper portion of a vertical pipe called a chimney. By interposing a liquid receiver in between, the heat generated in the heat exchange coil for condensing the refrigerant is air-cooled by the air flow in the vertical tube, so that the heat of the electrolyte of the storage battery can be cooled by the endothermic action of the heat exchange coil for evaporating the refrigerant. Since it is a natural cooling device, there is an essential problem that the natural cooling device cannot be used for a liquid level detection device for high-temperature liquid such as hot water in a power generation boiler. Is complicated because it requires a liquid receiver and refrigerant circulation piping path, and it is difficult and inconvenient to handle in all aspects such as parts management, assembly manufacturing, packaging storage, transportation and distribution, sales purchase, unpacking use, maintenance inspection, etc. Cumbersome and disadvantageous in price Essential and that there, big problems there.

  An object of the present invention is to make it possible to always reliably and reliably detect a liquid level of a high-temperature liquid such as hot water existing in an opaque container such as a power generation boiler with a currently available inexpensive liquid level detector.

  The above-mentioned object of the present invention is to float a heat-resistant magnet-embedded float in a high-temperature liquid existing in a non-magnetic stand column that is connected to upper and lower connecting pipes in an opaque container whose liquid level is to be detected, A number of liquid level detectors that are actuated by receiving a magnetic force from the magnet in the float are arranged at predetermined intervals in a nonmagnetic case that is erected in parallel to the outer peripheral surface of the stand column, and the nonmagnetic case Achieved by making the large number of liquid level detectors naturally air-cooled by the upward air flow generated in the case due to the temperature difference between the inside and outside of the case through the ventilation holes by making the ventilation holes vertically. did it.

Since the present invention employs the above-described means, the following effects can be obtained.
A large number of liquid level detectors in the present invention are arranged at predetermined intervals in a nonmagnetic case that is open and closed by natural air cooling by convection. The large number of liquid level detectors can be naturally air-cooled at once by the generated ascending air current, so that the liquid level detection device for high-temperature liquid according to the present invention is hot water of about 330 ° C. existing in an opaque container such as a power generation boiler. When the surface of the stand column and the nonmagnetic case are used at a high temperature of about 300 ° C., the temperature difference between the inside and outside of the case through the vents is used. With the rising airflow generated in the case, the temperature inside the case can be naturally cooled to 200 ° C. or less at once.

  Therefore, since many liquid level detectors can always exist in an atmosphere of about 200 ° C, they are made of a cylindrical sintered ferrite magnet that can be used at low cost by mass production with a Curie point of about 250 ° C or less. Even if a liquid level detector consisting of a general non-heat-resistant magnet is used as it is, the main factor that hinders its operation and action, that is, changes in the magnetic sensitivity characteristics due to high temperatures, including a decrease in the magnetic force of the liquid level detector due to high temperatures. As a result, the multiple liquid level detectors are operated in sequence following a magnetic float that moves minutely or greatly up and down in response to changes in the level of hot water present in the liquid container. In addition, as described above, the present invention can be used as it is with an inexpensive liquid level detector that is generally used at present, so that the use of the liquid level detector can be changed. There is an excellent effect that it can be easily implemented without considering the change in the arrangement interval in the nonmagnetic case and the manufacturing cost of the liquid level detector.

  In addition, as described above, the liquid level detection device for a high-temperature liquid, which was not possible with the device for naturally cooling the storage battery electrolyte solution of Patent Document 2, was successfully realized as described above. Since the refrigerant circulation piping path, etc. that are necessary in the present invention are not required at all in the present invention, parts management, assembly manufacturing, packaging storage, transport distribution, sales purchase, unpacking use, maintenance inspection, etc. as a liquid level detection device There is also an excellent effect that it is easy to handle in all aspects.

  According to the inventions of the fifth and sixth aspects of the present invention, in addition to the above-mentioned effects, the curved pipe communicates outwardly with the upper (or / and) lower vent hole in the nonmagnetic case. The relatively cold outside air away from the hot stand column can be taken in from the lower curved pipe, and even if each vent hole is made large, rainwater intrusions through the curved pipe attached to the upper vent hole. Because of the preventive action, rainwater does not enter the non-magnetic case from the upper ventilation hole, so the rising airflow generated in the case due to the temperature difference between the inside and outside of the case can be made as large as possible, and many liquid level detectors can be added. The effect of being able to cool naturally well was added.

  As an example of the best mode for carrying out the present invention, as shown in FIGS. 1 and 2, an opaque liquid into which high-temperature high-pressure hot water of about 330 ° C., such as a power generation boiler, is to be detected. A non-magnetic stand column 3 such as a stainless steel pipe is connected in advance to the outer peripheral surface of the container 1 with upper and lower connecting pipes 2, and a high-temperature and high-pressure liquid W such as hot water of about 300 ° C. existing in the column 3 is illustrated. A well-known heat-resistant magnet-incorporated float F made of a non-magnetic material such as stainless steel as shown in FIG. 3 is floated as shown in FIG. A high-magnetism heat-resistant magnet M having a sandwich structure in which the same poles are opposed to each other with a disc yoke y sandwiched between two flat ring-shaped heat-resistant magnets made of alnico magnets is shown in FIG. Well-known hand The interior of the float F is installed in advance in a step.

  On the other hand, on the outer peripheral surface of the stand column 3, a well-known vertically long nonmagnetic case 4 made of aluminum or the like having a transparent window plate 4B such as a heat-resistant glass plate is well-known such as a fastening band B and a set screw n as shown in FIG. The case 4 is installed adjacent to each other in parallel, and in the case 4, a cylindrical molded sintered ferrite magnet rotor that rotates by receiving the horizontal magnetic force from the magnet M in the float is used at low cost by mass production. A large number of liquid level detectors 5 that are made of currently available red and white divided rotating feather type magnet rotors are pivotally controlled by a well-known means at both predetermined vertical intervals as shown in FIGS. Set up.

  Next, in the present invention, by providing the air holes 4A as shown in FIGS. 1 and 3 above and below the nonmagnetic case 4, the temperature difference between the case internal temperature and the outside air passes through the air holes 4A. Thus, the liquid direct-view liquid level detection device according to the present invention that can naturally cool the numerous liquid level detectors 5 at once by the rising airflow A as shown by the arrows in FIG.

  However, the upper and lower vent holes 4A of the nonmagnetic case 4 are preferably formed as large as possible. However, the bent pipe 4C is formed in the upper (or / and) lower vent hole of the nonmagnetic case as shown in FIG. In this way, the relatively low temperature outside air away from the high temperature stand column 3 can be taken in from the lower vent hole 4A, and even if each vent hole 4A is formed larger, Due to the rainwater invasion preventing action by the curved pipe 4C connected to the air holes 4A, rainwater does not enter and flow into the nonmagnetic case 4 from the upper air holes 4A. Therefore, the rise generated in the case 4 due to the temperature difference between the inside and outside of the case The airflow A can be increased as much as possible, and many liquid level detectors can be naturally air-cooled better.

  Since the present invention is configured as described above, when the low-temperature or high-temperature liquid W enters from the opaque container 1 into the stand column 3 in use, the float F as shown in FIGS. The water line L floats on the liquid W in the column 3 at a position that matches the liquid level a in the liquid container 1, that is, the liquid level a in the stand column 3.

  Since the float F moves up and down following the change in the liquid level a, magnetic lines extending in the horizontal direction from the magnet M in the float aligned with the water line L of the float F are applied to the outer peripheral surface of the stand column 3 as shown in FIG. As shown in FIG. 3, the liquid level detectors 5 in the nonmagnetic case 4 installed in parallel are sequentially rotated following the change in the liquid level a, and the liquid level is changed to that of the nonmagnetic case 4. The color can be seen through the transparent window plate 4B, and the liquid level can be measured by a scale on the side of the window 4B. The high-temperature and high-pressure liquid W such as hot water present in the opaque container 1 such as a power generation boiler can be measured. A liquid level detector that can be used at low cost by mass production can always reliably detect the liquid level.

  The essential liquid level detectors 5 in the present invention are arranged at predetermined intervals in the upper and lower sides of the nonmagnetic case 4 in which the vent holes 4A are vertically provided, and the case 4 passes through the vent holes 4A. 3 is generated in the case due to a temperature difference between the inside and outside of the case, so that the large number of liquid level detectors 5 can be naturally air-cooled all at once. For example, in an opaque container such as a power generation boiler. When the liquid level detection device according to the present invention is used in room temperature outside air as a water level detection device of high temperature and high pressure hot water of about 330 ° C, even if the surface temperature of the stand column 3 is about 300 ° C, Since the temperature in the non-magnetic case 4 capable of natural air cooling is lowered to about 200 ° C. by the rising air flow A in the case 4, many liquid level detectors 5 can always exist in an atmosphere of about 200 ° C. Became.

  Therefore, the liquid level detector 5 as shown in the above figures by a large number of rotating blade type magnet rotors receiving the magnetic force from the magnet M in the float, and the number of color-coded magnet rollers as shown in FIG. As a result of the absence of the magnetic force lowering factor of the liquid level detection body 5 due to the high temperature atmosphere that hinders the operation and action of the liquid level detection body 5 of the present invention, a large number of liquid level detection bodies currently in use are used as the liquid level detection bodies In addition, each of these liquid level detectors 5 always follows the float F, which moves up and down minutely or greatly in response to changes in the surface of the hot water W existing in the stand column 3, and operates accurately. As a result of the fact that surface detection can always be performed accurately, the liquid level of liquid W such as hot water present in an opaque container 1 such as a power generation boiler can always be reliably detected by the currently available inexpensive liquid level detector 5. It became.

  Moreover, it is possible to use a combination circuit of the liquid level detector 5 and the resistance element R by a general glass tube sealed magneto-sensitive reed switch that can be used at low cost by mass production as shown in FIG. Factors that change the magnetosensitive characteristics of the reed switch due to a high-temperature atmosphere that hinders the operation and action of a combination circuit such as a large number of liquid level detectors and resistors, and factors that change the magneto-electric conversion characteristics of the Hall elements, and the resistor element R As a result of a significant decrease in resistance value changes due to high temperatures such as these, even if these many liquid level detectors 5 and resistance elements R are used at low cost, the liquid level detectors 5 are In response to a change in the surface of the hot water W existing in the stand column 3, it always follows the float F that moves up or down by a minute or large amount, and the resistor element R or the like is operated. As a result of the decrease in the resistance value change due to the high temperature of the parts, the liquid level of the liquid W such as hot water existing in the opaque container 1 such as a power generation boiler is used as an electric current such as a current and inexpensive liquid level detector 5 and the resistance element R. It is now possible to reliably detect with parts.

  5 and FIG. 6, the parts denoted by the same reference numerals as those in FIG. 3 indicate the same or equivalent parts as those in FIG. 3, and the parts indicated by reference numeral 6 in FIG. And a waterproof protective cylindrical body in which a combination circuit of a large number of liquid level detectors 5 including Hall elements and electrical components such as a large number of resistive elements R are connected in order up and down, and the cylindrical body 6 is disposed in the nonmagnetic case 4. And accommodated as shown in FIG.

  In the case where a well-known glass tube sealed magneto-sensitive reed switch or a well-known Hall element is installed and used as the liquid level detector 5 as shown in FIG. 6, these reed switches, Hall elements, etc. The combined circuit of the liquid level detector 5 and the electrical components such as a number of resistance elements R is collected and extended to a liquid level control room far from the power generation boiler, and each of the light emitting display elements such as LED elements is arranged on each of the light emitting display elements. By separately connecting the light emitting display elements, the respective light emitting display elements can sequentially emit light in real time in correspondence with the liquid level a of the liquid W in the opaque container 1, and the inside of the opaque container 1 such as a far away power generation boiler The liquid level a of the liquid W can be displayed or remotely controlled in the liquid level control chamber.

  The high-temperature liquid level detecting device according to the present invention can be used as a low-temperature liquid level detecting device as it is.

Vertical side view showing an example of the embodiment of the present invention Elevated view of the main part Enlarged sectional view of the main part of the present invention Cross-sectional plan view of the main part in FIG. Expanded sectional view showing another example of the main part of the present invention The expanded sectional view which shows the further another example of this invention principal part

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 High temperature liquid container 2 Upper and lower connecting pipes 3 Stand column 4 Nonmagnetic case 4A Vent hole 4B Perspective window plate 4C Curved pipe 5 Liquid level detector 6 Waterproof protective cylinder A Ascending air flow in nonmagnetic case a Liquid level F Heat resistant magnet Built-in float M Float magnet L Floating float water line W High temperature liquid

Claims (6)

  A float with a heat-resistant magnet is suspended in high-temperature liquid existing in a non-magnetic stand column that is connected to an opaque container to detect the liquid level with upper and lower connecting pipes, while parallel to the outer peripheral surface of the stand column. A large number of liquid level detectors that operate by receiving magnetic force from the float magnet are arranged in a standing nonmagnetic case at predetermined intervals, and vent holes are provided above and below the nonmagnetic case, respectively. By doing so, the liquid level detection device for high-temperature liquid, in which the liquid level detectors can be naturally air-cooled by the rising airflow generated in the case due to a temperature difference between the inside and outside of the case through each of the vent holes.   A float with a heat-resistant magnet is suspended in high-temperature liquid existing in a non-magnetic stand column that is connected to an opaque container to detect the liquid level with upper and lower connecting pipes, while parallel to the outer peripheral surface of the stand column. In a nonmagnetic case with a transparent window plate standing upright, a large number of liquid level detectors by a magnet rotor that rotates by receiving the magnetic force from the magnet in the float are pivoted at predetermined intervals and the nonmagnetic case is provided. By ventilating the upper and lower sides of the case, the large number of liquid level detectors can be naturally air-cooled by the rising air flow generated in the case due to a temperature difference between the inside and outside of the case through each of the air holes. Liquid level detector for high temperature liquid.   A float with a heat-resistant magnet is suspended in high-temperature liquid existing in a non-magnetic stand column that is connected to an opaque container to detect the liquid level with upper and lower connecting pipes, while parallel to the outer peripheral surface of the stand column. In a standing nonmagnetic case, a number of liquid level detectors comprising magnetically sensitive reed switches that open and close in response to the magnetic force from the magnet in the float are arranged at predetermined intervals, and the nonmagnetic case The high-temperature liquid that allows natural air cooling of the liquid level detectors by the rising air flow generated in the case due to the temperature difference between the inside and outside of the case through the ventilation holes by making the ventilation holes vertically. Liquid level detection device.   A float with a heat-resistant magnet is suspended in high-temperature liquid existing in a non-magnetic stand column that is connected to an opaque container to detect the liquid level with upper and lower connecting pipes, while parallel to the outer peripheral surface of the stand column. In a standing nonmagnetic case, a large number of liquid level detectors composed of Hall elements that receive the magnetic force from the magnet in the float are arranged at predetermined intervals, and ventilation holes are formed above and below the nonmagnetic case. A liquid level detection device for high-temperature liquid that is capable of natural air cooling of the multiple liquid level detection bodies by an upward air flow generated in the case due to a temperature difference between the inside and outside of the case through these vent holes.   The liquid level detection device for high-temperature liquid according to any one of claims 1 to 4, wherein a curved pipe is communicated and attached outwardly to an upper vent hole in the nonmagnetic case.   The liquid level detection device for high-temperature liquid according to any one of claims 1 to 5, wherein a curved pipe is connected to a lower vent hole in the nonmagnetic case so as to communicate outwardly.

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