JP2010221123A - Oil reservoir apparatus and oil detection method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oil reservoir apparatus capable of quickly and certainly detecting an oil at high accuracy by a simple structure. <P>SOLUTION: The oil reservoir apparatus 100 is an oil/water separation type oil reservoir apparatus 100 for receiving a liquid in which the oil may be mixed with water by leakage of the oil, and is provided with a receiving tank 110 for receiving the liquid; an oil/water separation tank 120 connected to the receiving tank 110 and separating the oil contained in the liquid to an upper side and separating water to a lower side; a first water-discharge pipe 122 connected to a lower part of the oil/water separation tank 120 and discharging the water stayed at the lower part when the liquid flowing into the oil/water separation tank 120 reaches to a predetermined water level; and a storage tank 130 for storing the water discharged by the first water-discharge pipe 122; and an oil detector 140 for detecting the oil when the oil of the oil/water separation tank 120 reaches to a predetermined liquid depth. An area of a liquid surface of the liquid in the oil/water separation tank 120 is narrower than an area of a liquid surface of the liquid in the storage tank 130. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an oil receiving apparatus that receives a liquid in which oil can be mixed into water due to oil leakage, and an oil detection method using an oil detector that detects oil reaching a predetermined liquid depth.

  In recent years, underground power transmission in which tunnels and pipes (hereinafter referred to as “caves”) are built underground, and a power transmission cable is laid therein, has become widespread mainly in urban areas. Then, OF cables and CV cables are used as power transmission cables for underground power transmission.

  In the OF cable, insulating oil is injected into the OF cable to enhance electrical insulation. Therefore, oil may be washed away due to aging or changes in the installation environment. When oil leaks into the cave, it is discharged to the outside along with drainage, which may lead to environmental pollution.

  Therefore, conventionally, an oil receiver 50 as shown in FIG. 6 is used. The oil receiver 50 is provided at the lower part of the OF cable 40, in particular, at the lower part of the joint part where there is a high possibility of oil leakage, and plays a role of receiving oil leakage.

  Specifically, the oil receiving device 50 includes a receiving tank 52, inflow pipes 54 and 60, an oil leakage prevention valve 56, a float 58, a storage tank 62, a drain pipe 64, an inflow hole 66, a detection tank 68, and an oil detector 70. Consists of. Oil leakage and water dripping from the OF cable 40 are first received by the receiving tank 52. When the oil level of the oil leakage or water reaches a predetermined height (the height of the opening of the inflow pipe 54), the oil leaks from the inflow pipe 54 into the oil leakage prevention valve 56.

  A float 58 is disposed inside the oil leakage prevention valve 56. The float 58 has a specific gravity intermediate between oil and water. Therefore, when the inflowing liquid is water, the float 58 having a specific gravity smaller than that of the water floats on the surface of the water and allows water to flow into the storage tank 62 from the inflow pipe 60. The water sent to the storage tank 62 is drained to the outside through the drain pipe 64.

  On the other hand, when the inflowing liquid is oil leakage, the float 58 having a specific gravity greater than that of the water descends and closes the inflow pipe 60. Thereby, since the discharge path is closed, the liquid level 42 of the receiving tank 52 rises as oil leakage or water (in this case, almost oil leakage) drops. When the liquid level 42 reaches a predetermined height (height of the inflow hole 66), oil leaks from the inflow hole 66 into the detection tank 68.

  An oil detector 70 is disposed in the detection tank 68. When the leaked oil reaches a predetermined liquid depth, the oil detector 70 transmits an abnormality to the outside. With such a mechanism, leakage of oil leakage to the outside and environmental pollution are prevented.

  However, the conventional oil receiver 50 has a problem in terms of accuracy because it uses a slight difference in specific gravity between oil and water. In addition, since the structure is complicated, simplification has been demanded. Further, in order for the oil receiver 50 to detect oil leakage, the oil leakage enters the oil leakage prevention valve 56 and flows into the detection tank 68 to reach a predetermined liquid depth. Therefore, the oil detector 70 is not detected unless a large amount of oil leaks, and there is a problem that takes a long time to detect.

  Conventionally, various techniques for detecting oil at an early stage with a small amount of oil leakage have been proposed. For example, Patent Document 1 discloses a technique for increasing the oil depth at an early stage by floating a cover on a tank that detects oil and reducing the area of the oil surface on which the oil floats.

JP 2007-205742 A

  However, the technique of Patent Document 1 increases the oil surface area of a tank that detects oil, and does not solve the problem of the oil receiver 50 that requires a long time to flow into the detection tank 68. There wasn't. In addition, the structural and accuracy problems described above have not been solved.

  The present invention has been made in view of such a problem, and an object thereof is to provide an oil receiver capable of detecting oil with a simple structure and with high accuracy at an early stage.

  In order to solve the above-described problems, a typical configuration of the present invention is an oil / water separation type oil receiving device that receives a liquid that can be mixed into water due to oil leakage, a receiving tank that receives the liquid, and a receiving tank. Connected to the stop tank, connected to the oil / water separation tank that separates the oil contained in the liquid upward and water, and the lower part of the oil / water separation tank, and when the liquid flowing into the oil / water separation tank reaches the predetermined water level, A first drain pipe for draining the water accumulated in the tank, a storage tank for storing the water drained from the first drain pipe, and an oil detector for detecting the oil when the oil in the oil-water separation tank reaches a predetermined liquid depth; The area of the liquid level in the oil / water separation tank is narrower than the area of the liquid level in the storage tank.

  According to such a configuration, oil can be detected with high accuracy at an early stage with a simple structure.

  When the stored water reaches a predetermined water level, the storage tank includes a second drain pipe that drains the water to the outside, and the second drain pipe may drain the water staying in the lower part of the storage tank. Thereby, the water of a storage tank can be drained suitably and the need for maintenance, an inspection, and maintenance can be reduced (maintenance-free).

  The receiving tank may include a splash capturing member that prevents scattering of the splash generated when the liquid is received. Thereby, scattering of the liquid to the outside can be prevented.

  In order to solve the above problems, another representative configuration of the present invention is an oil detection method using an oil detector that detects oil when the oil reaches a predetermined liquid depth, and the oil is leaked due to oil leakage. The liquid that can be mixed into the water is received in the receiving tank, the oil contained in the liquid is separated upward, the water is separated downward in the oil / water separating tank connected to the receiving tank, and the oil detector is installed in the oil / water separating tank. It is characterized by detecting oil using, draining and storing from the lower part of the oil-water separation tank into a storage tank having a liquid surface area wider than that of the oil-water separation layer.

  The component corresponding to the technical idea in the oil receiving apparatus described above and the description thereof can be applied to the oil detection method.

  According to the present invention, it is possible to provide an oil receiver that has a simple structure and can detect oil early and reliably with high accuracy.

It is a figure which shows the external appearance of the oil receiver concerning 1st Embodiment. It is AA sectional drawing of the oil receiver concerning 1st Embodiment. It is an enlarged view of the oil-water separation tank of the oil receiver concerning 1st Embodiment. It is a figure which shows the external appearance of the oil receiver concerning 2nd Embodiment. It is BB sectional drawing of the oil receiver concerning 2nd Embodiment. It is a figure explaining the conventional oil receiver.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiment are merely examples for facilitating understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

(First embodiment)
FIG. 1 is an external view of an oil receiver 100 according to the first embodiment, FIG. 2 is a cross-sectional view taken along line AA of the oil receiver 100 according to the present embodiment, and FIG. 3 is an oil receiver according to the present embodiment. It is an enlarged view of the oil-water separation tank. 1A is a perspective view of the oil receiving device 100, and FIG. 1B is a top view of the oil receiving device 100. FIG. Hereinafter, the oil receiver 100 will be described in detail with reference to FIGS. 1, 2, and 3.

  The oil receiving apparatus 100 according to the present embodiment includes a receiving tank 110, a splash preventing member 112, an oil / water separation tank 120, a first drain pipe 122, a storage tank 130, a second drain pipe 132, and an oil detector 140. The

  The receiving tank 110 receives the liquid dripped from the upper part of the apparatus and plays a role of taking it into the oil receiving apparatus 100. Therefore, it is formed wider than at least the oil / water separation tank 120 so that the range to be received can be included. In other words, when receiving a range narrower than the oil / water separation tank 120, the receiving tank 110 is not necessarily required. The receiving tank 110 preferably has a low surface friction coefficient in order to guide the received liquid to the connected oil / water separation tank 120. A splash preventing member 112 is disposed on the upper portion of the receiving tank 110.

  The splash preventing member 112 prevents scattering of the splash that occurs when the liquid is received. Thereby, the discharge | release to the exterior of the trace amount oil contained in a splash can also be avoided. The splash preventing member 112 is disposed only on the upper part of the receiving tank 110 (see FIG. 2). This is because if the splash preventing member 112 is provided at the lower part of the receiving tank 110, the liquid received in the receiving tank 110 may be prevented from flowing into the oil / water separation tank 120, and as a result, good oil detection is achieved. This is because there is a possibility that it cannot be performed. The same effect can be obtained by adopting a configuration in which a predetermined amount of liquid is always stored in the receiving tank 110 instead of the splash preventing member 112.

  The oil / water separation layer 120 is connected to the bottom surface of the receiving tank 110 at the upper part, and separates liquid components (substances contained in the liquid) guided by the receiving tank 110 by specific gravity. For example, in the case of oil and water, oil having a specific gravity of 0.9 is generally separated upward, and water having a specific gravity of 1.0 is separated downward. Further, foreign matters such as solids contained in the liquid accumulate on the bottom surface of the oil / water separation tank 120 if the specific gravity is heavier than water.

  The separated oils gather to form an oil surface 150, and the water forms a water surface 152a. When the oil level 150 reaches a predetermined liquid depth, it is detected by the oil detector 140 (described later). Therefore, in order to detect oil early with a small amount of oil, it is necessary to increase the oil depth, and the oil / water separation tank 120 is formed to have a liquid surface area narrower than at least the storage tank 130. In addition, since convection is more likely to occur as the volume of the oil / water separation tank 120 is reduced, a convection suppressing member (not shown) that suppresses convection may be provided in the oil / water separation tank 120.

  The first drain pipe 122 is connected to the lower part of the oil / water separation tank 120 at one end, and drains the separated and retained water to the storage tank 130. Since the other end of the first drain pipe 122 is formed upward from one end, the liquid guided to the oil / water separation tank 120 is not sent to the storage tank 130 as it is. Specifically, when the height of the oil surface 150 of the oil / water separation tank 120 is higher than the height of the other end of the first drain pipe 122 (predetermined water level), the storage tank 130 starts from the lower part of the connected oil / water separation tank 120. Drain the separated water. The drained water forms a water surface 152 b in the storage tank 130. That is, the height of the water surface 152b is equal to the height of the oil surface 150. In addition, if the connection part of the one end of the 1st drain pipe 122 is made into the position slightly higher than the bottom face of the oil-water separation tank 120, the possibility of sending the deposited solid substance to the storage tank 130 can be excluded.

  The storage tank 130 stores the water drained from the first drain pipe 122. Since the storage tank 130 according to the present embodiment is a space that is disposed at the bottom of the receiving tank 110 and is hermetically sealed, it is possible to eliminate the possibility that foreign matter may enter from outside (except for the first drain pipe 122).

  The second drainage pipe 132 is connected to the lower part of the storage tank 130 at one end, and drains the water stored and retained in the lower part to the outside of the oil receiver 100. Since the other end of the second drain pipe 132 is formed upward from one end, the water sent to the storage tank 130 is not immediately drained. Specifically, when the height of the water surface 152b is higher than the height of the other end of the second drain pipe 132 (predetermined water level), water is drained from the lower part of the connected storage tank 130 to the outside.

  Even if oil flows in from the 1st drain pipe 122 by this structure, the storage tank 130 has an effect as a 2nd oil-water separation tank, and prevents the loss of the oil to the exterior. In addition, the second drain pipe 132 is formed at a position away from the first drain pipe 122 by a predetermined distance. Therefore, it is possible to eliminate the possibility that the oil flows in and is discharged outside without being separated from the oil and water while being on the liquid flow. Furthermore, since the water in the storage tank 130 is automatically drained to a predetermined height, the need for maintenance, inspection and maintenance can be reduced (maintenance free).

  The oil detector 140 is disposed in the oil / water separation tank 120 and detects oil having reached a predetermined liquid depth. Specifically, the oil detector 140 is a float type, floats on the liquid surface of the oil / water separation tank 120 (oil surface 150 when oil is present), and discharges current from the electrode 142. Then, when the liquid level is water, the current is returned to the detector because the water is a conductor, but when the liquid level is oil, the current is not returned to the detector because the oil is a non-conductor. Utilizing this difference, the oil detector 140 detects oil when a predetermined liquid depth is reached, and generates an abnormality to the outside by a detection signal. Generally, the liquid depth at which the oil detector 140 detects oil is about 5 mm.

  With the configuration described above, the oil receiver 100 receives the oil dripped from the OF cable 40 or the like in the receiving tank 110 and sends it to the oil / water separation tank 120 where the liquid surface area is reduced and the oil depth is increased. Oil can be detected at an early stage by the detector 140. Moreover, the dripped water can be received by the receiving tank 110 and drained to the outside through the oil / water separation tank 120 and the storage tank 130. That is, oil can be detected early and reliably, and water that does not affect the environment can always be drained to the outside. Thereby, the oil receiver 100 which can prevent environmental pollution suitably can be obtained.

(Second Embodiment)
4A and 4B are views showing the appearance of the oil receiver 200 according to the second embodiment. In particular, FIG. 4A is a perspective view of the oil receiver 200, and FIG. 4B is a top view of the oil receiver 200. It is. FIG. 5 is a BB cross-sectional view of the oil receiver 200 according to the second embodiment. Hereinafter, the oil receiver 200 will be described in detail with reference to FIGS. 4 and 5. In the first embodiment, description of components already described is omitted.

  The oil receiving apparatus 200 according to the present embodiment includes a first receiving tank 210, a second receiving tank 220, a communication pipe 222, a locking member 224, an oil / water separation tank 120, a first drain pipe 122, a storage tank 130, a first tank. 2 It is comprised from the drainage pipe 132 and the oil detector 140.

  The first receiving tank 210 is configured to have a predetermined inclination toward the oil / water separation tank 120 located at the center, and receives the liquid dripped from the upper part of the apparatus. With this configuration, the received liquid can be easily guided to the oil / water separation tank 120.

  The second receiving tank 220 is formed as a separate body from the oil receiving device 200 and is connected to the first receiving tank 210 via the communication pipe 222 and the locking member 224. By providing the second receiving tank 220, it is possible to make it a wider range receiving target. In other words, the second receiving tank 220 is not necessarily required as a component of the oil receiving device 200. If it is desired to receive a wider range, a third receiving tank and a fourth receiving tank may be provided (not shown). The second receiving tank 220 is configured to have a predetermined inclination toward the communication pipe 222.

  The communication pipe 222 is fixed to the side surface of the second receiving tank 220, is inserted into the first receiving tank 210, and sends the liquid received by the second receiving tank 220 to the first receiving tank 210. This liquid sent to the first receiving tank 210 is guided to an inclination and sent to the oil / water separation tank 120.

  The locking member 224 is composed of a bolt, a screw, a nut, and the like, and firmly fixes the first receiving tank 210 and the second receiving tank 220.

  With the above-described configuration, the oil receiving device 200 receives the oil dripped from the OF cable 40 or the like with the first receiving tank 210 and the second receiving tank 220, and the liquid surface area is reduced to reduce the oil depth. It can guide along the inclination to the oil / water separation tank 120 that can be earned and can be detected early by the oil detector 140. Further, the dripped water can be received by the first receiving tank 210 and the second receiving tank 220 and drained to the outside through the oil / water separation tank 120 and the storage tank 130. That is, as a target for receiving a wide range, oil can be detected early and reliably, and water that does not affect the environment can always be discharged to the outside. Thereby, the oil receiver 200 which can prevent environmental pollution suitably can be obtained.

  One of the excellent features of the oil receivers 100, 200 according to the present embodiment is that a small amount of oil is used without being limited by the size of the receiving tanks 110, 210, 220 (range for receiving liquid). This means that oil detection is possible at an early stage. That is, in the conventional example represented by FIG. 6, when the size of the receiving tank 52 is increased, the amount of oil necessary until oil detection increases. In contrast, the oil receivers 100 and 200 according to the present embodiment can freely set the sizes of the receiving tanks 110, 210, and 220 without changing the amount of oil required until oil detection.

  In addition, although the case where it installed below the OF cable 40 was mentioned as an example and demonstrated above, the oil receivers 100 and 200 concerning this embodiment are not limited to this example. For example, it can be installed under a transformer that uses a large amount of oil and cools it with water in the summertime to catch the oil leak.

  As mentioned above, although preferred embodiment of this invention was described in detail, it cannot be overemphasized that this invention is not limited to this embodiment. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Understood.

  INDUSTRIAL APPLICABILITY The present invention can be used in an oil receiving apparatus that receives a liquid that can be mixed into water due to oil leakage, and an oil detection method that uses an oil detector that detects oil reaching a predetermined liquid depth.

  DESCRIPTION OF SYMBOLS 100 ... Oil receiving apparatus, 110 ... Receiving tank, 112 ... Splash prevention member, 120 ... Oil-water separation tank, 122 ... 1st drain pipe, 130 ... Storage tank, 132 ... 2nd drain pipe, 140 ... Oil detector, DESCRIPTION OF SYMBOLS 150 ... Oil surface, 152a, 152b ... Water surface, 200 ... Oil receiving apparatus, 210 ... 1st receiving tank, 220 ... 2nd receiving tank, 222 ... Locking member, 224 ... Communication pipe, 40 ... OF cable, 42 Liquid level 50 Oil receiving device 52 Receiving tank 54 Inflow pipe 56 Oil leakage prevention valve 58 Floating 60 Inflow pipe 62 Storage tank 64 Drain pipe 66 Inflow Hole, 68 ... detection tank, 70 ... oil detector,

Claims (4)

An oil-water separation type oil receiving device that receives a liquid in which oil can be mixed into water due to oil leakage,
A receiving tank for receiving the liquid;
An oil / water separation tank connected to the receiving tank and separating the oil contained in the liquid upward and the water downward;
A first drain pipe that is connected to the lower part of the oil / water separation tank and drains the water remaining in the lower part when the liquid flowing into the oil / water separation tank reaches a predetermined water level;
A storage tank for storing the water drained from the first drain pipe;
An oil detector for detecting the oil when the oil in the oil / water separation tank reaches a predetermined liquid depth;
With
The oil receiving apparatus according to claim 1, wherein an area of the liquid level of the liquid in the oil / water separation tank is smaller than an area of the liquid level of the liquid in the storage tank. When the stored water reaches a predetermined water level, the storage tank includes a second drain pipe that drains the water to the outside.
2. The oil receiver according to claim 1, wherein the second drain pipe drains the water remaining in a lower portion of the storage tank.   The oil receiving apparatus according to claim 1, wherein the receiving tank includes a splash capturing member that prevents scattering of the splash that occurs when the liquid is received. An oil detection method using an oil detector that detects oil when the oil reaches a predetermined liquid depth,
Receiving liquid that can be mixed into water due to oil leakage in the receiving tank,
In the oil / water separation tank connected to the receiving tank, the oil contained in the liquid is separated upward and the water is separated downward;
Detecting the oil using the oil detector in the oil-water separation tank,
An oil detection method comprising draining and storing from the lower part of the oil / water separation tank to a storage tank having a liquid surface area wider than the oil / water separation layer.

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