JP6252443B2 - Hydrostatic cylinder for oil leak detector - Google Patents

Description

  The present invention relates to a hydrostatic cylinder for an oil leak detector.

  In the solvent extraction step of the hydrometallurgical process, the organic solvent and water are mixed and stirred and then left to stand, and the target metal is concentrated using the difference in solubility between the organic solvent and water. In an industrial solvent extraction apparatus, a large amount of organic solvent such as several hundred liters to several hundred kiloliters is held in the apparatus.

  The organic solvent itself is a dangerous substance, and heavy metals are often carried on it. If the organic solvent leaks from the apparatus and flows out of the plant, it may cause environmental damage or fire damage. Therefore, the solvent extraction device is installed in the breakwater in preparation for leakage of the organic solvent due to damage to the device. The liquid breakwater has a volume capable of storing at least the organic solvent held in the solvent extraction device. The breakwater can prevent the organic solvent from leaking out of the plant even if it leaks from the device.

  There are several pits in the breakwater, and the liquid that has flowed into the breakwater is collected in the pit. In the pit, an underwater pump for discharging liquid from the pit, a sensor for monitoring liquidity such as pH, and an oil leak detector for detecting the presence of oil (organic solvent) in the pit (for example, patents) Reference 1) is provided. When the leakage of the organic solvent is detected by the oil leak detector, the operation of the solvent extraction process is stopped, and the presence or absence of damage to the solvent extraction apparatus is confirmed or repaired.

  General oil leak detectors have improved accuracy so that even oil films (thickness of 0.1 mm or less) can be detected, and have the ability to detect even small amounts of oil leaks. However, in the case of a solvent extraction device, an oil layer derived from the machine oil of the device is usually present in the pit, and the thickness thereof is about several mm to several tens of mm. Therefore, a general oil leak detector detects an oil layer derived from machine oil or the like, resulting in false detection. Therefore, in order to detect the leakage of organic solvent, the oil leak detector should be set not to detect when the oil layer thickness is about several millimeters, but to detect when the reference value (eg 50 mm) is reached. Is done.

  The thickness of the oil layer changes locally due to the undulation of the liquid level, but this change increases as the oil layer becomes thicker. Therefore, when the oil layer becomes thick to some extent, there is a problem that the oil leak detector detects an oil leak even though the thickness of the oil layer does not reach the reference value in a stationary state, resulting in a false detection. If the operation of the solvent extraction process is stopped each time an erroneous detection is made, the operation efficiency is lowered.

JP 2001-174317 A

  In view of the above circumstances, an object of the present invention is to provide a still water cylinder for an oil leak detector that can suppress the undulation of the liquid level and reduce erroneous detection of the oil leak detector.

A hydrostatic cylinder for an oil leak detector according to a first aspect of the present invention includes a cylinder provided in a pit, into which an oil leak detector is inserted, and a liquid passage hole is formed only on one half of the side surface of the cylinder. It is characterized by being formed over.
The hydrostatic cylinder for an oil leak detector according to a second aspect of the present invention is the first aspect of the present invention, wherein the liquid passage hole is composed of a plurality of small holes arranged at intervals. At least one small hole is arranged in a horizontal plane at any height from the upper end to the lower end of the hole formation range.
A still water cylinder for an oil leak detector according to a third aspect of the present invention is characterized in that, in the first or second aspect, the cylindrical body is cylindrical .

According to the first invention, since the liquid passage hole is formed in the side surface of the cylindrical body, the oil floating on the liquid surface can enter the inside of the cylindrical body through the liquid passage hole and is inserted into the cylindrical body. A leak detector can detect oil leaks. Further, since the liquid level inside the cylinder is suppressed, the oil layer can be kept stationary, and erroneous detection of the oil leak detector can be reduced. Furthermore, since the liquid passage hole is formed only on one half of the side surface of the cylindrical body, it is possible to suppress the wave from entering the cylindrical body by facing the range to the wall surface of the pit. The internal liquid level can be further suppressed.
According to the second invention, since the liquid passing hole is composed of a plurality of small holes arranged at intervals, the strength of the cylindrical body can be increased as compared with the case where the liquid passing hole is a long hole. .

It is a side view of the still water pipe concerning one embodiment of the present invention. It is a top view of the still water cylinder. It is explanatory drawing of the detection method of an oil leak detector, Comprising: (A) shows the case where an oil layer is thin, (B) The case where an oil layer is thick. It is a side view of the cylinder of the still water cylinder. FIG. 5 is a cross-sectional view taken along line VV in FIG. 4. It is a side view of the cylinder of the hydrostatic cylinder which concerns on other embodiment.

Next, an embodiment of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the hydrostatic cylinder A according to an embodiment of the present invention is used in an oil leak detector D that detects leakage of an organic solvent from a solvent extraction device. The solvent extraction device is installed in the breakwater, and a pit P is installed in the breakwater. The pit P is a tank that is recessed from the rest of the breakwater, so that the liquid that flows out of the solvent extraction device, as well as industrial water used for rainwater and water for scene cleaning, etc. gather in the pit P. It is configured. An oil leak detector D is provided in the pit P, and by detecting the presence of oil in the pit P, leakage of the organic solvent is detected.

  In addition, the pit P should just be a tank in which the liquid of the detection target of the oil leak detector D is stored. The liquid to be detected is not limited to the organic solvent used in the solvent extraction device, and includes any liquid. In other words, the device installed in the liquid barrier is not limited to the solvent extraction device. In general, the pits P are installed in the breakwater, but are not limited to this configuration.

(Oil leak detector D)
Next, the oil leak detector D will be described.
The type of the oil leak detector D is not particularly limited as long as it is a detector that floats on the liquid surface, but a capacitive oil leak detector D is preferably used. Capacitance type oil leak detector D detects the presence of oil using the difference in capacitance between water and oil.

  As shown in FIG. 3, the oil leak detector D includes a float 11 that floats on the liquid surface and a probe 12 for detecting capacitance. The float 11 has a substantially disk shape, and three probes 12 (two of which are shown in FIG. 3) are attached to three places around the float 11. The probe 12 is a rod-shaped electrode, and is fixed to the float 11 with the tip thereof directed vertically downward. The number of probes 12 is not limited to three, but may be one or two or more.

  As shown in FIG. 3A, when a thin oil layer o (oil film) is formed on the water layer w in the pit P, or when the liquid in the pit P is only water, the tip of the probe 12 is Located in the water layer w, the oil leak detector D measures the capacitance of water.

  As shown in FIG. 3 (B), when oil flows into the pit P due to leakage of an organic solvent and the oil layer o becomes thick, the float 11 floats on the surface of the oil layer o, and the probe 12 is pulled out from the water layer w. The tip is located in the oil layer o. If it does so, the electrostatic capacitance measured with the oil leak detector D will decrease. This change in capacitance is transmitted as an electrical signal to the remote converter via the cable, and the relay is activated to detect oil leakage.

As described above, in the case of the solvent extraction apparatus, the oil layer o derived from the machine oil of the apparatus is usually present in the pit P, and the thickness thereof is about several mm to several tens of mm. In order to detect the leakage of the organic solvent, the oil leak detector D is set so as not to detect when the thickness of the oil layer o is about several mm but to detect when the reference value is reached. For example, when the flat area of the breakwater is 100 m ² and the flat area of the pit P is 1 m ² and the detection standard of organic solvent leakage is 50 liters, the reference value is 50 mm. The oil leak detector D is set by replacing the probe 12 with one having a length suitable for the reference value.

  However, when the oil layer o becomes thick to some extent, the oil leak detector D may detect the oil leak even though the thickness of the oil layer o has not reached the reference value in the stationary state. This is because the thickness of the oil layer o locally changes due to the undulation of the liquid level, but this change increases as the oil layer o becomes thicker. Therefore, by installing the oil leak detector D in the still water cylinder A, the liquid level is suppressed and the false detection is reduced.

(Still water cylinder A)
Next, the hydrostatic cylinder A will be described.
As shown in FIGS. 1 and 2, the hydrostatic cylinder A includes a cylindrical body 20 that is a main body of the static water cylinder A and a support member 30 that supports the cylindrical body 20. The cylinder 20 is a cylindrical member having both ends opened, and a flange is formed at the upper end. An oil leak detector D is inserted into the cylindrical body 20. The cylinder 20 has an inner diameter sufficient for the oil leak detector D to move up and down following the fluctuation of the liquid level.

  The support member 30 includes a support column 31 standing outside the pit P and an arm 32 that is fixed to the support column 31 and has a tip projecting above the pit P. A support plate 33 having a circular opening is fixed to the free end of the arm 32 located above the pit P. By inserting the cylinder 20 into the opening of the support plate 33 from above, the flange of the cylinder 20 is locked to the support plate 33 and the cylinder 20 is fixed to the support member 30. The cylindrical body 20 is provided in the pit P so that its central axis is along the vertical direction. Moreover, the cylinder 20 is arrange | positioned in the vicinity of the wall surface of the pit P, and is arrange | positioned a little apart from the wall surface.

  By the way, a general still water cylinder has a structure in which a lower end is opened, and liquid inside and outside the still water cylinder passes back and forth through the opening. However, since oil (organic solvent) has a specific gravity lighter than water and floats on the liquid surface, in a general still water cylinder, oil cannot enter the still water cylinder, and if the oil leak detector D is inserted into the still water cylinder, Oil leak cannot be detected. The hydrostatic cylinder A of the present embodiment is characterized in that a liquid passage hole is formed on a side surface thereof to allow oil to enter the inside.

  As shown in FIG. 4, a liquid passage hole 21 is formed on the side surface of the cylindrical body 20 in the vertical direction. The formation range of the liquid passage hole 21 is determined so as to include the fluctuation range of the liquid level in the pit P. The liquid passage hole 21 is composed of a plurality of small holes 22 arranged at intervals. Each small hole 22 is a vertically long hole. The size of the small hole 22 is a size through which oil (organic solvent) to be detected can pass, and is determined in consideration of the viscosity of the oil (organic solvent) and the like. The dimension of the small hole 22 is determined to be a dimension that makes it difficult for the wave to enter the inside of the cylindrical body 20.

  A plurality of small holes 22 are arranged in a straight line with intervals to form a hole row 23 (23a, 23b). On the side surface of the cylindrical body 20, two hole rows 23a and 23b are arranged in parallel along the vertical direction. Further, the small holes 22 constituting the two hole rows 23a and 23b are alternately arranged.

  As shown in FIG. 5, the small holes 22 constituting one hole row 23a and the small holes 22 constituting the other hole row 23b are arranged so that a part thereof has the same height. Thus, at least one small hole 22 is arranged on the side surface of the cylindrical body 20 in any horizontal plane from the upper end to the lower end of the formation range of the liquid passage hole 21. Therefore, oil floating on the liquid surface can be infiltrated into the cylindrical body 20 regardless of the liquid level.

  In addition, the interval between the two hole rows 23 a and 23 b is arranged at a position where the angles with respect to the center of the cylindrical body 20 are orthogonal. In addition, the small hole 22 which comprises the liquid flow hole 21 should just be formed in the side surface of the half of one side, when the cylinder 20 is a cylindrical shape. The cylindrical body 20 is provided in the pit P so that the liquid passage hole 21 faces the wall surface W of the pit P. In other words, the liquid passage hole 21 is formed in a range facing the wall surface W of the pit P on the side surface of the cylindrical body 20.

  As described above, since the liquid passage hole 21 is formed on the side surface of the cylindrical body 20, the oil floating on the liquid surface can enter the cylindrical body 20 through the liquid passage hole 21 and is inserted into the cylindrical body 20. The oil leak detector D thus detected can detect the oil leak.

  Further, the liquid level in the pit P is generated by the action of a liquid flow generated by the start and stop of the submersible pump or the wind, but the liquid level inside the cylinder 20 is suppressed. Moreover, since the liquid passage hole 21 is formed in a range facing the wall surface W of the pit P and is a position where the wave does not easily enter directly, it is possible to suppress the wave outside the cylindrical body 20 from entering the inside, The wave of the liquid surface inside the cylinder 20 can be further suppressed. Therefore, the oil layer o inside the cylindrical body 20 can be set in a stationary state, and erroneous detection of the oil leak detector D can be reduced.

(Other embodiments)
In the above embodiment, the small holes 22 constituting the liquid passage holes 21 are aligned to form the hole row 23. However, the small holes 22 may be arranged at intervals, and are not aligned. Also good. Further, the shape and dimensions of the small holes 22 may not be unified. If at least one small hole 22 is arranged in the horizontal plane at any height from the upper end to the lower end of the formation range of the liquid passage hole 21, oil that floats on the liquid surface regardless of the liquid level. Can be infiltrated inside.

  As shown in FIG. 6, the liquid passage hole 21 may be replaced with a configuration including the small holes 22 and may be one linear long hole. Even with such a configuration, the same effects as those of the above-described embodiment can be obtained. However, the strength of the cylindrical body 20 is higher when the liquid passage hole 21 is composed of a plurality of small holes 22 than in the case where the liquid passage hole 21 is a long hole. Can do.

The hole row 23 shown in FIG. 4 and the liquid passage hole 21 shown in FIG. 6 are formed along the central axis of the cylindrical body 20, but are not limited thereto, and are inclined with respect to the central axis of the cylindrical body 20. May be formed.
Further, the cylindrical body 20 is not limited to a cylindrical shape, and may have other shapes such as a rectangular cylindrical shape.

A Still water cylinder D Oil leak detector P Pit 20 Cylinder 21 Fluid passage hole 22 Small hole 23 Hole row 30 Support member 31 Support column 31 Arm 33 Support plate

Claims (3)

Provided in the pit, with a cylinder body into which the oil leak detector is inserted,
A hydrostatic cylinder for an oil leak detector, wherein a liquid passage hole is formed on only one half of the side surface of the cylinder body so as to extend vertically. The liquid passage hole is composed of a plurality of small holes arranged at intervals,
The at least one said small hole is arrange | positioned in the horizontal surface of any height from the upper end to the lower end of the formation range of the said liquid flow hole in the side surface of the said cylinder. Hydrostatic cylinder for oil leak detector. The hydrostatic cylinder for an oil leak detector according to claim 1 or 2, wherein the cylinder is cylindrical .

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