JP2012107726A - Hydraulic fluid storage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hydraulic fluid storage device which can restrain a concentration increase in carbon monoxide in an atmosphere in a tank.SOLUTION: This hydraulic fluid storage device 100 includes a nitrogen gas cylinder 115 and a control valve 116 for feeding nitrogen gas 103 in a tank body 111, a relief valve 117 for leaking the atmosphere 102 in the tank body 111 to an external part when pressure of the atmosphere 102 in the tank body 111 becomes an upper limit value or more, a CO detector 191 for detecting the carbon monoxide concentration in the atmosphere 102 in the tank body 111, and a control device 190 for setting the carbon monoxide concentration in the atmosphere 102 in the tank body 111 to a reference value or less, by controlling the control valve 116 to purge the atmosphere 102 in the tank body 111 from the relief valve 117 based on information from the CO detector 191, when the carbon monoxide concentration in the atmosphere 102 in the tank body 111 becomes an upper limit value or more.

Description

  The present invention relates to a hydraulic oil storage device that stores hydraulic oil supplied to and discharged from a hydraulic actuator or the like, and is particularly effective when applied to a hydraulic oil that is easily hydrolyzed, such as a phosphate ester type. .

  For example, in hydraulic actuators such as actuators that actuate the impeller of a power generation turbine, since the hydraulic oil is used in a high temperature environment, phosphate ester type hydraulic oil with excellent flame retardancy is used. . This phosphate ester type hydraulic oil is easily hydrolyzed and changes its properties. For this reason, for example, in Patent Document 1 below, the hydraulic oil is stored in a tank that is blocked from outside air, and a bladder type accumulator is provided in the tank so that the hydraulic oil is supplied to the hydraulic actuator. The pressure fluctuation of the atmosphere in the tank due to the change in the capacity of the hydraulic oil in the tank due to exhaust can be mitigated without contacting with the outside air.

JP 2005-172178 A

  By the way, in the tank in which the above-described phosphate ester type hydraulic oil was stored, a phenomenon in which the carbon monoxide concentration in the internal atmosphere gradually increased with time was observed. This is considered to be caused by the gradual reaction of oxygen derived from air in the atmosphere in the tank with the hydraulic oil.

  Accordingly, an object of the present invention is to provide a hydraulic oil storage device that can suppress an increase in the concentration of carbon monoxide in an atmosphere in a tank.

  In order to solve the above-described problem, a hydraulic oil storage device according to a first aspect of the present invention includes a tank body that is blocked from outside air and stores hydraulic oil therein, and is connected to the tank body to be connected to the tank body. An inert gas pressure fluctuation reducing means for reducing the pressure fluctuation of the atmosphere in the tank body accompanying a change in the capacity of the hydraulic oil, and an inert gas supply means for supplying an inert gas into the tank main body. When the pressure of the atmosphere in the gas supply means and the tank main body is equal to or higher than the upper limit value, the pressure in the tank main body is set to be equal to or lower than a reference value smaller than the upper limit value. Leak means for leaking the atmosphere to the outside of the tank main body, carbon monoxide detection means for detecting the concentration of carbon monoxide in the atmosphere in the tank main body, and the atmosphere in the tank main body When the concentration of carbon monoxide exceeds the upper limit value, the inert gas supply means is configured to purge the atmosphere in the tank body from the leak means based on information from the carbon monoxide detection means. And a control unit that controls the concentration of carbon monoxide in the atmosphere in the tank body to be equal to or lower than a reference value smaller than an upper limit value.

  The hydraulic oil storage device according to a second aspect of the present invention is the hydraulic oil storage device according to the first aspect, wherein the inert gas supply means is disposed inside the tank body and floats above the liquid level of the hydraulic oil. Guide means for holding the floater movably in the vertical direction, an inert gas delivery tool provided on the floater and having a delivery port for delivering the inert gas, and movement of the floater along the guide means The apparatus further comprises follow-up connection means for connecting between the inert gas supply means and the delivery port of the inert gas delivery tool while following the above.

  The hydraulic oil storage device according to a third aspect of the present invention is the hydraulic oil storage device according to the second aspect, wherein the inert gas delivery tool is provided in the floater so as to be positioned at a horizontal central portion inside the tank body. It is characterized by that.

  The hydraulic oil storage device according to a fourth aspect of the present invention is the hydraulic oil storage device according to any one of the first to third aspects, wherein a plurality of the leak means are arranged at predetermined intervals along the upper periphery of the tank body. It is characterized by.

  The hydraulic oil storage device according to a fifth aspect of the present invention is the air supply device according to any one of the first to fourth aspects, wherein the inert gas supply means of the inert gas supply means supplies air. Supply means, dry air generating means for removing water contained in the air from the air supply means, oxygen gas is separated from the dry air generated by the dry air generating means, and nitrogen gas is supplied to the tank body And nitrogen gas generating means for feeding into the interior of the apparatus.

  A hydraulic oil storage device according to a sixth aspect of the present invention is the hydraulic oil storage device according to any one of the first to fifth aspects, wherein the hydraulic oil is stored in the tank body, and the hydraulic oil in the sub tank is stored in the tank body. Hydraulic oil supply means for supplying the hydraulic oil, hydraulic oil return means for returning the hydraulic oil in the tank body to the sub tank, hydraulic oil upper limit detection means for detecting the upper limit amount of the hydraulic oil in the tank body, Hydraulic oil lower limit amount detecting means for detecting a lower limit amount of the hydraulic oil in the tank body, and the control means is based on information from the hydraulic oil upper limit amount detecting means and the hydraulic oil lower limit amount detecting means. The hydraulic oil supply means and the hydraulic oil return means are controlled so as to vary the hydraulic oil in the tank main body between the upper limit amount and the lower limit amount, and the operation is performed on the tank main body. oil's By performing discharge, and characterized in that to purge the atmosphere in the tank body from said leakage circuit.

  The hydraulic oil storage device according to a seventh aspect of the present invention is the hydraulic oil storage device according to the sixth aspect, wherein the control means is based on information from the carbon monoxide detection means and the carbon monoxide in the atmosphere in the tank body. The hydraulic oil supply means and the hydraulic oil return means are controlled so as to stop the supply and discharge of the hydraulic oil to and from the tank body when the concentration of the oil becomes equal to or less than the reference value.

  The hydraulic oil storage device according to an eighth invention is the sixth or seventh invention, wherein the control means is arranged in the atmosphere in the tank body based on information from the carbon monoxide detection means. When the concentration of carbon monoxide exceeds the upper limit, the hydraulic oil supply means and the hydraulic oil return means are controlled to start supplying and discharging the hydraulic oil to and from the tank body. To do.

  The hydraulic oil storage device according to a ninth aspect of the present invention is the hydraulic oil storage device according to any one of the first to eighth aspects, further comprising atmospheric pressure measuring means for measuring the pressure of the atmosphere in the tank body, wherein the control means Based on the information from the atmosphere pressure measuring means, when the pressure of the atmosphere in the tank body is less than a lower limit value smaller than the reference value, the inert gas is supplied into the tank body. The inert gas feeding means is controlled so that the pressure in the tank body is equal to or higher than the lower limit value.

  According to the hydraulic oil storage device according to the present invention, the atmosphere in the tank body can be purged with an inert gas, so that an increase in the concentration of carbon monoxide in the atmosphere in the tank body can be suppressed.

It is a schematic block diagram of 1st embodiment at the time of utilizing the hydraulic-oil storage apparatus which concerns on this invention for a hydraulic actuator. It is a schematic block diagram of 2nd embodiment at the time of utilizing the hydraulic oil storage apparatus which concerns on this invention for a hydraulic actuator. It is a schematic block diagram of 3rd embodiment at the time of utilizing the hydraulic oil storage apparatus which concerns on this invention for a hydraulic actuator. It is a schematic block diagram of 4th embodiment at the time of utilizing the hydraulic-oil storage apparatus which concerns on this invention for a hydraulic actuator. It is a schematic block diagram of 5th embodiment at the time of utilizing the hydraulic oil storage apparatus which concerns on this invention for a hydraulic actuator.

  Although the embodiment of the hydraulic oil storage device concerning the present invention is described based on a drawing, the present invention is not limited only to the following embodiments explained based on a drawing.

[First embodiment]
1st Embodiment at the time of utilizing the hydraulic-oil storage apparatus based on this invention for a hydraulic actuator is described based on FIG.

  As shown in FIG. 1, phosphoric ester-based hydraulic oil 101 is stored inside a tank body 111 that forms a box shape that is blocked from outside air. A bladder type accumulator 112 is connected to the ceiling surface of the tank body 111. A dehumidifying agent 113 is disposed between the tank body 111 and the accumulator 112. Between the accumulator 112 and the dehumidifying agent 113, a safety valve 114 that opens at a safety pressure value Ps or higher is connected.

  An oil receiving port of the high pressure pump 11 is connected to the lower part of the tank body 111. The oil feed outlet of the high-pressure pump 11 communicates with an oil receiving portion of a hydraulic actuator 12 such as an actuator that operates the impeller of the power generation turbine. The oil delivery part of the hydraulic actuator 12 communicates with the tank body 111 above.

  A nitrogen gas cylinder 115 that is an inert gas cylinder filled with an inert gas nitrogen gas 103 is connected to the ceiling surface of the tank body 111 via a control valve 116. Further, the tank body 111 is opened on the ceiling surface when the upper limit value Pu (Ps> Pu) is smaller than the opening pressure value (safety pressure value) Ps of the safety valve 114, and is smaller than the upper limit value Pu. A relief valve 117 is connected to close when the value Pc (Pu> Pc> atmospheric pressure) or less.

  A CO detector 191, which is a carbon monoxide detector that detects the concentration of carbon monoxide in the atmosphere inside the tank body 111, is provided on the tank body 111. The CO detector 191 is electrically connected to an input unit of a control device 190 that is a control means. The output unit of the control device 190 is electrically connected to the control valve 116, and the control device 190 controls the opening / closing operation of the control valve 116 based on information from the CO detector 191. (Details will be described later).

  In such a hydraulic oil storage device 100 according to this embodiment, the accumulator 112, the dehumidifying agent 113, the safety valve 114, etc. constitute an atmospheric pressure fluctuation mitigation means, and the nitrogen gas cylinder 115, the control valve 116, etc. The inert gas supply means is configured, the inert gas supply means is configured only by the inert gas supply means, and the leakage means is configured by the relief valve 117 and the like.

  Next, the operation of the hydraulic oil storage device 100 according to this embodiment described above will be described.

  When the high-pressure pump 11 is activated, the hydraulic oil 101 in the tank body 111 is supplied to the hydraulic actuator 12 to operate the hydraulic actuator 12. At this time, the atmosphere 102 in the accumulator 112 flows into the tank main body 111 through the dehumidifying agent 113 as the space increases due to the decrease in the volume of the hydraulic oil 101, so that the atmosphere 102 in the space 102 Pressure decrease fluctuation is alleviated. When the hydraulic oil 101 is sent from the hydraulic actuator 12 and returned to the tank main body 111, the inside of the tank main body 111 is reduced in space due to an increase in the capacity of the hydraulic oil 101. When the atmosphere 102 is pushed back into the accumulator 112, the pressure increase fluctuation of the atmosphere 102 in the space is reduced.

  As the hydraulic oil 101 in the tank main body 111 is supplied and discharged as described above, the hydraulic oil 101 in the tank main body 111 changes with the oxygen derived from air in the atmosphere 102 in the tank main body 111 over time. When the carbon monoxide concentration in the atmosphere 102 in the tank body 111 is equal to or higher than the upper limit value Cu, the control device 190 displays the information from the CO detector 191. Based on this, the control valve 116 is controlled to be opened so that the nitrogen gas 103 is fed into the tank body 111.

  As a result, the pressure of the atmosphere 102 increases in the tank body 111 as the nitrogen gas 103 is supplied. When the pressure of the atmosphere 102 in the tank main body 111 becomes equal to or higher than the upper limit value Pu, the relief valve 117 is opened so as to leak the atmosphere 102 in the tank main body 111 to the outside, and the atmosphere in the tank main body 111 is 102 is purged, and the concentration of carbon monoxide in the atmosphere 102 in the tank body 111 gradually decreases.

  In this way, when the carbon monoxide concentration in the atmosphere 102 in the tank main body 111 becomes equal to or less than the reference value Cc (Cu> Cc), the control device 190 is based on the information from the CO detector 191. The control valve 116 is controlled to be closed so that the supply of the nitrogen gas 103 from the nitrogen gas cylinder 115 is stopped.

  When the pressure of the atmosphere 102 in the tank body 111 becomes equal to or lower than the reference value Pc, the relief valve 117 is closed so as to stop the leakage of the atmosphere 102 in the tank body 111 to the outside. The purge of the atmosphere 102 inside is completed. Hereinafter, by repeating the above-described operation, the carbon monoxide concentration in the atmosphere 102 in the tank body 111 is always kept below the upper limit value Pu.

  That is, in the hydraulic oil storage device 100 according to the present embodiment, when the carbon monoxide concentration in the atmosphere 102 in the tank body 111 becomes equal to or higher than the upper limit Cu, the atmosphere 102 in the tank body 111 is replaced with the nitrogen gas 103. By purging, the concentration of carbon monoxide in the atmosphere 102 in the tank main body 111 is set to a reference value Cc or less.

  Therefore, according to the hydraulic oil storage device 100 according to the present embodiment, an increase in the concentration of carbon monoxide in the atmosphere 102 in the tank body 111 can be suppressed.

  In addition, since the atmosphere 102 is purged with the inert nitrogen gas 103, deterioration of the hydraulic oil 101 due to oxygen can be suppressed, and the concentration of carbon monoxide in the atmosphere 102 in the tank body 111 can be further increased. It can be surely suppressed.

[Second Embodiment]
A second embodiment when the hydraulic oil storage device according to the present invention is used in a hydraulic actuator will be described with reference to FIG. In addition, about the part similar to the case of 1st embodiment mentioned above, by using the code | symbol similar to the code | symbol used in description of 1st embodiment mentioned above, 1st embodiment mentioned above is used. The description overlapping with the description in is omitted.

  As shown in FIG. 2, inside the tank body 111, a plurality of guide bars 221 having an axial direction directed up and down are erected so as to communicate between the floor surface and the ceiling. These guide bars 221 hold a peripheral edge side of a plate-like floater 222 that can float on the hydraulic oil 101 so as to be slidable along the axial direction of the guide bar 221.

  That is, the floater 222 can move up and down along the guide bar 221 following the vertical fluctuation of the liquid level of the hydraulic oil 101.

  On the floater 222, a disk nozzle 223 having a plurality of outlets 223a formed in a radial manner on a horizontal plane is disposed so as to be positioned in the horizontal central portion inside the tank body 111. One end side of a connection pipe 224 that is U-shaped and disposed on the lower surface side of the floater 222 is connected to the base end side of the delivery port 223 a of the disk nozzle 223 through the floater 222. . The other end side of the connecting pipe 224 protrudes on the hydraulic oil 101 so as to be positioned above the liquid level of the hydraulic oil 101.

  One end side of a flexible tube 225 having flexibility is connected to the other end side of the connection pipe 224. The other end of the flexible tube 225 is connected to the nitrogen gas cylinder 115 connected to the ceiling surface of the tank body 111 via the control valve 116. The flexible tube 225 has a length longer than the length between the liquid surface when the hydraulic oil 101 in the tank body 111 is the smallest and the ceiling surface of the tank body 111.

  A plurality of the relief valves 117 connected to the ceiling surface of the tank body 111 are arranged at predetermined intervals along the peripheral edge of the ceiling surface of the tank body 111.

  In the hydraulic oil storage device 200 according to the present embodiment, a guide means is configured by the guide bar 221 and the like, an inert gas delivery tool is configured by the disk nozzle 223 and the like, and the connection pipe 224 and the flexible tube 225 are configured. The following connecting means is constituted by the above, and together with the inert gas feeding means constituted by the nitrogen gas cylinder 115, the control valve 116, etc., the floater 222, the guide means, the inert gas delivery tool, the following connecting means. Thus, the inert gas supply means is configured.

  In the hydraulic oil storage device 200 according to this embodiment, the supply and discharge of the hydraulic oil 101 in the tank body 111 is performed in the same manner as the hydraulic oil storage device 100 according to the first embodiment described above. As the process proceeds, when the carbon monoxide concentration in the atmosphere 102 in the tank body 111 exceeds the upper limit Cu, the control device 190, as in the case of the first embodiment described above, Based on the information from the detector 191, the control valve 116 is controlled to be opened.

  As a result, the nitrogen gas 103 in the nitrogen gas cylinder 115 flows from the outlet 223a of the disk nozzle 223 through the flexible tube 225 and the connection pipe 224 to the hydraulic oil in the central portion in the horizontal direction in the tank body 111. 101 is fed radially in the horizontal direction on the liquid surface.

  At this time, the disk nozzle 223 moves up and down along the guide bar 221 integrally with the floater 222 following the vertical fluctuation of the liquid level position of the hydraulic oil 101 in the tank body 111, Since the flexible tube 225 also moves following the up-and-down movement, the nitrogen gas 103 from the nitrogen gas cylinder 115 is centered in the horizontal direction without being influenced by the liquid level position of the hydraulic oil 101 in the tank body 111. It is always fed into the tank main body 111 from the liquid level of the part of the hydraulic oil 101.

  When the pressure of the atmosphere 102 in the tank body 111 rises to the upper limit value Pu or higher, the atmosphere 102 in the tank body 111 leaks to the outside as in the case of the first embodiment described above. Thus, when the relief valve 117 is opened, the atmosphere 102 in the tank body 111 is purged to the outside from a plurality of locations along the peripheral edge of the ceiling surface of the tank body 111.

  That is, in the hydraulic oil storage device 200 according to the present embodiment, the nitrogen gas 103 can always be fed radially in the horizontal direction on the liquid level of the hydraulic oil 101 at the horizontal central portion inside the tank body 111. In addition, the atmosphere 102 in the tank body 111 can be purged to the outside from a plurality of locations along the peripheral edge of the ceiling surface of the tank body 111.

  For this reason, in the hydraulic oil storage device 200 according to the present embodiment, the nitrogen gas 103 can always be distributed uniformly throughout the space of the tank body 111.

  Therefore, according to the hydraulic oil storage device 200 according to the present embodiment, it is possible to obtain the same effect as that of the hydraulic oil storage device 100 according to the first embodiment described above, as described above. Purging the atmosphere 102 with the nitrogen gas 103 can be performed more efficiently than in the case of the first embodiment.

[Third embodiment]
3rd Embodiment at the time of utilizing the hydraulic-oil storage apparatus which concerns on this invention for a hydraulic actuator is described based on FIG. In addition, about the part similar to the case of 1st, 2nd embodiment mentioned above, by using the code | symbol similar to the code | symbol used in description of 1st, 2nd embodiment mentioned above, the 1st mentioned above. The description overlapping with the description in the second embodiment is omitted.

  As shown in FIG. 3, the air delivery port of the air blower 331 which is an air feeding means for feeding air 304 removes water 305 contained in the air 304 and generates dry air 306. It is connected to the air receiving port of the air dryer 332 as means. The air delivery port of the air dryer 332 is connected to the air receiving port of the separation device 333 that is a nitrogen gas generating means having a hollow fiber membrane that allows the oxygen gas 307 to pass through without passing through the nitrogen gas 103. The nitrogen gas delivery port of the separation device 333 is connected to the other end of the flexible tube 225 connected to the ceiling surface of the tank body 111 via a check valve 334.

  The air blower 331 is electrically connected to an output unit of a control device 390 serving as control means. The CO detector 191 is electrically connected to the input unit of the control device 390, and the control device 390 controls the operation of the air blower 331 based on information from the CO detector 191. (Details will be described later).

  In the hydraulic oil storage device 300 according to the present embodiment, the air blower 331, the air dryer 332, the separation device 333, the check valve 334, and the like constitute an inert gas feeding means.

  In the hydraulic oil storage device 300 according to this embodiment, the hydraulic oil 101 in the tank body 111 is the same as the hydraulic oil storage devices 100 and 200 according to the first and second embodiments described above. When the carbon monoxide concentration in the atmosphere 102 in the tank main body 111 exceeds the upper limit Cu as the supply / discharge of is increased, the control device 390 is based on the information from the CO detector 191. The start of the operation of the air blower 331 is controlled.

  The air 304 taken into the air blower 331 is sent to the air dryer 332, dehumidified to remove the water 305, supplied as dry air 306 to the separation device 333, and oxygen gas by the hollow fiber membrane. By separating and removing 307, the nitrogen gas 103 is supplied to the flexible tube 225 via the check valve 334, and hereinafter, the hydraulic oil storage device 200 according to the second embodiment described above is supplied. Similarly to the case, the nitrogen gas 103 flows horizontally from the delivery port 223a of the disk nozzle 223 through the connection pipe 224 on the liquid level of the hydraulic oil 101 at the horizontal central portion in the tank body 111. Radiated and sent.

  Then, the pressure of the atmosphere 102 in the tank body 111 becomes equal to or higher than the upper limit Pu, and the atmosphere 102 in the tank body 111 is changed as in the case of the hydraulic oil storage device 200 according to the second embodiment described above. By opening the relief valve 117 so as to leak to the outside, the atmosphere 102 in the tank body 111 is purged to the outside, and the carbon monoxide concentration in the atmosphere 102 in the tank body 111 gradually decreases. When the reference value Cc or less is reached, the control device 390 controls to stop the operation of the air blower 331 based on information from the CO detector 191.

  That is, in the hydraulic oil storage device 300 according to the present embodiment, instead of the nitrogen gas cylinder 115 and the control valve 116 of the hydraulic oil storage devices 100 and 200 according to the first and second embodiments described above, the air blower 331, By applying the air dryer 332, the separation device 333, the check valve 334, etc., the nitrogen gas 103 can be supplied, and the operation of the air blower 331 is controlled by the control device 390 from the CO detector 191. It was made to control based on.

  Therefore, according to the hydraulic oil storage device 300 according to the present embodiment, it is possible to obtain the same effect as that of the hydraulic oil storage device 200 according to the second embodiment described above, as well as nitrogen gas. Since 103 can be obtained from the air 304 without bothering, the running cost can be reduced as compared with the case of the first and second embodiments described above.

[Fourth embodiment]
A fourth embodiment when the hydraulic oil storage device according to the present invention is used in a hydraulic actuator will be described with reference to FIG. In addition, about the part similar to the case of 1st-3rd embodiment mentioned above, by using the code | symbol similar to the code | symbol used in description of 1st-3rd embodiment mentioned above, the 1st mentioned above. The description overlapping with the description in the third embodiment is omitted.

  As shown in FIG. 4, the lower part of the tank body 111 is connected to the receiving port of the return pump 442 via the discharge valve 441. The outlet of the return pump 442 is connected to a sub-tank 443 having a box shape that is blocked from outside air and stores the hydraulic oil 101 therein. A lower portion of the sub tank 443 is connected to a receiving port of the feed pump 445 through a check valve 444. The delivery port of the feed pump 445 is connected to the tank body 111.

  The nitrogen gas cylinder 115 and the control valve 116 are connected to the ceiling surface of the sub tank 443 through a control valve 446. A relief valve 447 is connected to the ceiling surface of the sub-tank 443. The relief valve 447 opens when the upper limit value Pu is exceeded and closes when the reference value Pc is reached.

  Further, an upper limit level that is a hydraulic oil upper limit amount detection unit that detects the upper limit amount of the hydraulic oil 101 in the tank main body 111 by detecting the liquid level position of the hydraulic oil 101 near the upper side of the tank main body 111. A detector 491 is provided. Near the lower side of the tank body 111, a lower limit level detector which is a hydraulic oil lower limit amount detecting means for detecting a lower surface amount of the hydraulic oil 101 in the tank body 111 by detecting a liquid level position of the hydraulic oil 101. 492 is provided.

  The level detectors 491 and 492 are electrically connected together with the CO detector 191 to an input unit of a control device 490 which is a control means. The output unit of the control device 490 is electrically connected to the valves 441 and 446 and the pumps 442 and 445 together with the control valve 116, and the control device 490 includes the detectors 191, 491 and 492. Based on the information from the above, the opening / closing operation of the valves 116, 441, 446 and the operation of the pumps 442, 445 can be controlled (details will be described later).

  In the hydraulic oil storage device 400 according to the present embodiment, hydraulic oil return means is constituted by the discharge valve 441, the return pump 442, etc., and hydraulic oil supply means is constituted by the check valve 444, the feed pump 445, etc. The sub-tank atmosphere supply means is constituted by the nitrogen gas cylinder 115, the control valve 446 and the like, and the sub-tank atmosphere discharge means is constituted by the relief valve 447 and the like.

  In the hydraulic oil storage device 400 according to the present embodiment, the control device 490 operates as in the case of the hydraulic oil storage device 100 according to the first embodiment described above, so that the control device 490 performs the CO detection. The operation of the control valve 116 is controlled based on information from the container 191.

  At the same time, the control device 490 operates the feed pump 445 so as to supply the hydraulic oil 101 in the sub-tank 443 to the inside of the tank body 111, and the nitrogen gas 103 in the sub-tank 443. When the control valve 446 is controlled to open so that the amount of hydraulic oil is supplied, the amount of the hydraulic oil 101 increases in the tank body 111, the liquid level of the hydraulic oil 101 rises, and the space of the atmosphere 102 decreases. Therefore, the amount of the atmosphere 102 purged from the relief valve 117 to the outside increases.

  At this time, the nitrogen gas 103 is supplied to the subtank 443 in accordance with the increase in the space accompanying the lowering of the liquid level of the hydraulic oil 101, so that the atmosphere does not fluctuate greatly.

  When the liquid level of the hydraulic oil 101 in the tank main body 111 reaches the upper limit, the control device 490 determines the hydraulic oil 101 in the sub tank 443 based on information from the upper limit level detector 491. While the operation of the feed pump 445 is stopped so as to stop the supply of the gas into the tank body 111, the control valve 446 is closed and controlled so as to stop the supply of the nitrogen gas 103 into the sub tank 443. Then, the opening control of the discharge valve 441 and the operation of the return pump 442 are started so as to return the hydraulic oil 101 in the tank main body 111 to the inside of the sub tank 443.

  As a result, the hydraulic oil 101 in the tank main body 111 is reduced, the liquid level is lowered, the space in the tank main body 111 is expanded, and the nitrogen gas 103 supplied and present in the tank main body 111 is present. Greatly increases, and the carbon monoxide concentration in the atmosphere 102 decreases greatly.

  At this time, the pressure in the sub-tank 443 increases as the space of the hydraulic oil 101 increases due to the increase in the liquid level, but the nitrogen gas 103 leaks from the relief valve 447, so that the atmosphere has a large pressure fluctuation. There is no.

  When the liquid level of the hydraulic oil 101 in the tank body 111 reaches the lower limit, the control device 490 determines the hydraulic oil 101 into the sub tank 443 based on information from the lower limit level detector 492. The operation of the return pump 442 is stopped so as to stop the feeding.

  Thereafter, the control device 490 repeats the above-described operation based on the information from the CO detector 191 until the carbon monoxide concentration in the atmosphere 102 in the tank body 111 becomes equal to or less than the reference value Cc. .

  That is, in the hydraulic oil storage device 400 according to the present embodiment, not only the supply of the nitrogen gas 103 to the atmosphere 102 in the tank body 111 but also the hydraulic oil 101 with an upper limit amount and a lower limit amount. The purging is also performed by moving up and down the liquid level of the hydraulic oil 101 by varying the time.

  Therefore, according to the hydraulic oil storage device 400 according to the present embodiment, the same effect as that of the hydraulic oil storage device 100 according to the first embodiment described above can be obtained, as described above. The purging of the atmosphere 102 in the tank body 111 can be performed more efficiently than in the first embodiment.

  In addition, since the nitrogen gas 103 is supplied to and discharged from the sub tank 443 as the hydraulic oil 101 in the sub tank 443 increases and decreases, a large pressure fluctuation in the atmosphere in the sub tank 443 is prevented. However, deterioration of the hydraulic oil 101 in the sub tank 443 can be suppressed.

[Fifth embodiment]
A fifth embodiment when the hydraulic oil storage device according to the present invention is used in a hydraulic actuator will be described with reference to FIG. In addition, about the part similar to the case of the 1st-4th embodiment mentioned above, by using the code | symbol similar to the code | symbol used in description of the 1st-4th embodiment mentioned above, the 1st mentioned above. The description overlapping with the description in the fourth embodiment will be omitted.

  As shown in FIG. 5, a pressure sensor 591 that is an atmospheric pressure measuring unit that measures the pressure of the atmosphere 102 in the tank main body 111 is provided on the ceiling portion of the tank main body 111. This pressure sensor 591 is electrically connected together with the detectors 191, 491 and 492 to the input part of the control device 590 which is a control means. The output unit of the control device 590 is electrically connected to the valves 116, 441, 446 and the pumps 442, 445, respectively. The control device 590 includes the pressure sensor 591 and the detectors 191, 491, Based on the information from 492, the opening / closing operation of the valves 116, 441, 446 and the operation of the pumps 442, 445 can be controlled (details will be described later).

  In the hydraulic oil storage device 500 according to the present embodiment, the control device 590 operates as the detector by operating in the same manner as the hydraulic oil storage device 400 according to the fourth embodiment described above. Based on information from 191, 491, 492, the opening / closing operation of the valves 116, 441, 446 and the operation of the pumps 442, 445 are controlled.

  Then, for some reason, the pressure of the atmosphere 102 in the tank main body 111 is greatly reduced to be lower than the lower limit value Pd (Pc> atmospheric pressure> Pd) smaller than the reference value Pc. When there is a possibility that outside air or the like may enter the air, the control device 590 further controls the pressure sensor 591 so that the pressure of the atmosphere 102 in the tank body 111 is equal to or higher than the lower limit value Pd. Based on this information, the control valve 116 is controlled to supply the nitrogen gas 103 into the tank body 111.

  Thereby, the pressure of the atmosphere 102 is always kept at the lower limit value Pd or more in the tank main body 111, and intrusion of outside air or the like is prevented in advance.

  Therefore, according to the hydraulic oil storage device 500 according to the present embodiment, the same effect as that of the hydraulic oil storage device 400 according to the fourth embodiment described above can be obtained, as described above. The increase in the concentration of carbon monoxide in the atmosphere 102 in the tank body 111 can be suppressed more reliably than in the first to fourth embodiments.

[Other Embodiments]
The present invention is not limited to the hydraulic oil storage devices 100, 200, 300, 400, and 500 according to the embodiments shown in the drawings, and the hydraulic oil is appropriately combined with the technical features described in the embodiments. It is also possible to configure a storage device.

  Since the hydraulic oil storage device according to the present invention can suppress an increase in the concentration of carbon monoxide in the atmosphere in the tank body, it can be used extremely beneficially in various industries that use hydraulic actuators and the like.

DESCRIPTION OF SYMBOLS 11 High pressure pump 12 Hydraulic actuator 100 Hydraulic oil storage apparatus 101 Hydraulic oil 102 Atmosphere 103 Nitrogen gas 111 Tank main body 112 Accumulator 113 Dehumidifier 114 Safety valve 115 Nitrogen gas cylinder 116 Control valve 117 Relief valve 190 Control apparatus 191 CO detector 200 Hydraulic oil storage Device 221 Guide bar 222 Float 223 Disc nozzle 223a Outlet 224 Connection tube 225 Flexible tube 300 Hydraulic oil storage device 304 Air 305 Water 306 Dry air 307 Oxygen gas 331 Air blower 332 Air dryer 333 Separation device 334 Check valve 390 Control device 400 Hydraulic oil Storage device 441 Drain valve 442 Return pump 443 Sub tank 444 Check valve 445 Feed pump 446 Control valve 447 Relief valve 490 Control device 4 91 Upper limit level detector 492 Lower limit level detector 500 Hydraulic oil storage device 590 Control device 591 Pressure sensor

Claims (9)

A tank body that is blocked from outside air and stores hydraulic oil inside;
Atmospheric pressure fluctuation mitigating means coupled to the tank main body for mitigating pressure fluctuation of the atmosphere in the tank main body accompanying a change in capacity of the hydraulic oil in the tank main body;
An inert gas supply means including an inert gas supply means for supplying an inert gas into the tank body;
When the pressure of the atmosphere in the tank main body is equal to or higher than the upper limit value, the atmosphere in the tank main body is set to the tank main body so that the pressure of the atmosphere in the tank main body is lower than a reference value smaller than the upper limit value. Leak means for leaking outside,
Carbon monoxide detection means for detecting the concentration of carbon monoxide in the atmosphere in the tank body;
When the concentration of carbon monoxide in the atmosphere in the tank body exceeds the upper limit value, the atmosphere in the tank body is purged from the leak means based on information from the carbon monoxide detection means. And a control means for controlling the inert gas supply means so that the concentration of carbon monoxide in the atmosphere in the tank body is equal to or lower than a reference value smaller than an upper limit value. Oil storage device. The hydraulic oil storage device according to claim 1,
The inert gas supply means comprises:
A floater disposed inside the tank body and floating on the liquid level of the hydraulic oil;
Guide means for holding the floater in a vertically movable manner;
An inert gas delivery tool provided on the floater and having a delivery port for delivering the inert gas;
Follow-up connection means for connecting between the inert gas feed means and the delivery port of the inert gas delivery tool while following the movement of the floater along the guide means. Hydraulic oil storage device. The hydraulic oil storage device according to claim 2,
The hydraulic oil storage device, wherein the inert gas delivery tool is provided in the floater so as to be located in a horizontal central portion inside the tank body. In the hydraulic oil storage device according to any one of claims 1 to 3,
A plurality of the leak means are arranged at predetermined intervals along the upper periphery of the tank main body. In the hydraulic oil storage device according to any one of claims 1 to 4,
The inert gas supply means of the inert gas supply means;
An air supply means for supplying air;
Dry air generating means for removing water contained in the air from the air feeding means;
A hydraulic oil storage device comprising: a nitrogen gas generation unit that separates oxygen gas from the dry air generated by the dry air generation unit and feeds the nitrogen gas into the tank body. The hydraulic oil storage device according to any one of claims 1 to 5,
A sub-tank for storing the hydraulic oil therein;
Hydraulic oil supply means for supplying the hydraulic oil in the sub-tank into the tank body;
Hydraulic oil return means for returning the hydraulic oil in the tank body to the sub tank;
Hydraulic oil upper limit amount detecting means for detecting the upper limit amount of the hydraulic oil in the tank body;
Hydraulic oil lower limit amount detecting means for detecting a lower limit amount of the hydraulic oil in the tank body,
The control means varies the hydraulic oil in the tank body between the upper limit quantity and the lower limit quantity based on information from the hydraulic oil upper limit quantity detection means and the hydraulic oil lower limit quantity detection means. The hydraulic oil supply means and the hydraulic oil return means are controlled to supply and discharge the hydraulic oil to and from the tank body, thereby purging the atmosphere in the tank body from the leak means. A hydraulic oil storage device characterized by being. The hydraulic oil storage device according to claim 6,
When the concentration of carbon monoxide in the atmosphere in the tank body becomes equal to or less than the reference value based on information from the carbon monoxide detection means, the control means supplies and discharges the hydraulic oil to and from the tank body. The hydraulic oil storage device is characterized in that the hydraulic oil supply means and the hydraulic oil return means are controlled so as to stop. The hydraulic oil storage device according to claim 6 or 7,
When the concentration of carbon monoxide in the atmosphere in the tank body exceeds the upper limit based on information from the carbon monoxide detection means, the control means supplies and discharges the hydraulic oil to and from the tank body. The hydraulic oil storage device is characterized in that the hydraulic oil supply means and the hydraulic oil return means are controlled to start the operation. The hydraulic oil storage device according to any one of claims 1 to 8,
Comprising atmospheric pressure measuring means for measuring the pressure of the atmosphere in the tank body;
Based on the information from the atmosphere pressure measuring means, when the pressure of the atmosphere in the tank body becomes less than a lower limit value that is smaller than the reference value, the control means causes the inert gas to enter the tank body. The hydraulic oil storage device according to claim 1, wherein the inert gas supply means is controlled so as to supply the pressure in the tank body to the lower limit value or more.

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