JP2011027126A - Fireproof structure of hydraulic device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make a self-cooling function act by an internal leak only in an emergency such as in a fire to demonstrate fireproof performance, while saving energy without increase in weight cost nor impairing controllability. <P>SOLUTION: In the hydraulic device 1, flammable liquid is used as working fluid, and the working fluid is supplied into neighboring high pressure chamber 5 or 6 and a low pressure chamber 6 or 5. The high pressure chamber 5 communicates with the low pressure chamber 6 through a throttle flow path 11, and the throttle flow path 11 is closed with a closing member 14. The closing member 14 is removed from the throttle flow path 11, at a usable upper limit temperature or higher of the hydraulic device 1 and at a heatproof temperature or lower of seal members 12, 13 used in the hydraulic device. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a fireproof structure for hydraulic equipment using a flammable liquid as a working fluid, for example, fuel oil as a working fluid.

  In a fluid pressure device that uses a flammable liquid as a pressure working fluid, it prevents ignition from the fluid pressure device and prevents the spread of the fire when exposed to high temperature during a fire, etc., or Some are required to delay the spread of the fire.

  For example, various hydraulic actuators used in jet engines, such as hydraulic cylinders, use fuel oil as a working fluid, and the required fire resistance is required for such hydraulic cylinders. As a fire resistance test for evaluating the fire resistance performance, there is a fire resistance of 15 minutes in a state where the hydraulic cylinder is directly exposed to a flame.

  Conventional hydraulic cylinders that require fire resistance have a structure that causes internal leakage so that the oil flow is always maintained from the high pressure side to the low pressure side. In addition, the hydraulic cylinder is prevented from rising in temperature during heating.

  On the other hand, if the self-cooling is caused by internal leakage, the pressure is reduced due to internal leakage. Therefore, it is necessary to always operate the hydraulic pump in order to maintain a high pressure, which is disadvantageous in terms of energy saving. Further, the controllability is reduced due to the presence of the leak. In order to obtain a predetermined pressure, there is a problem that the hydraulic pump becomes large and the weight cost increases.

JP 2000-205206 A

  In view of such circumstances, the present invention allows a self-cooling function due to internal leakage to act only in the event of an emergency such as a fire, and achieves fire resistance without increasing energy savings, weight cost, and loss of controllability. It is to provide hydraulic equipment that demonstrates it.

  The present invention provides a hydraulic device in which a flammable liquid is used as a working fluid and the working fluid is supplied to adjacent high-pressure chambers and low-pressure chambers, and the high-pressure chamber and the low-pressure chamber communicate with each other through a throttle channel. The throttle channel is blocked by a blocking member, and the blocking member is excluded from the throttle channel at a temperature not lower than a use upper limit temperature of the hydraulic device and not higher than a heat resistant temperature of a seal member used in the hydraulic device. This relates to the fireproof structure of the hydraulic equipment constructed as described above.

  According to the present invention, the hydraulic device is a hydraulic cylinder, and the throttle channel is formed so as to penetrate the piston, and the throttle channel is used in the hydraulic cylinder above the upper limit temperature of the hydraulic cylinder. The present invention relates to a fireproof structure of a hydraulic device that is closed by a low melting point metal that melts below the heat resistance temperature of the sealing member.

  According to the present invention, the hydraulic device is a hydraulic cylinder, and the high pressure chamber and the low pressure chamber are communicated with each other by a bypass flow path, and the bypass flow path is used for the hydraulic cylinder above a use upper limit temperature of the hydraulic cylinder. The present invention relates to a fireproof structure of a hydraulic device that is closed by a low melting point metal that melts below the heat resistance temperature of the sealing member.

  According to the present invention, the hydraulic device is a hydraulic cylinder, the throttle channel is drilled so as to penetrate the piston, and the throttle channel is liquid-tightly closed by a channel block lid, and the channel block lid Is related to a fireproof structure of a hydraulic device fixed to the piston by a low melting point metal that melts at a temperature not lower than a use upper limit temperature of the hydraulic cylinder and not higher than a heat resistance temperature of a seal member used in the hydraulic cylinder.

  Furthermore, in the present invention, the hydraulic device is a hydraulic cylinder, the throttle channel is formed so as to penetrate the piston, and the throttle channel is liquid-tightly closed by a channel block lid, and the channel block is closed. The lid is a magnet, and the attraction force is reduced below the force due to the differential pressure between the high pressure chamber and the low pressure chamber at a temperature above the upper limit temperature of the hydraulic cylinder and below the heat resistance temperature of the seal member used in the hydraulic cylinder. The present invention relates to a fireproof structure of a hydraulic device configured to fall off.

  According to the present invention, in a hydraulic device in which a flammable liquid is used as a working fluid and the working fluid is supplied to adjacent high pressure chambers and low pressure chambers, the high pressure chamber and the low pressure chamber are throttled. The throttle channel is blocked by a blocking member, and the blocking member is excluded from the throttle channel at a temperature not lower than a use upper limit temperature of the hydraulic device and not higher than a heat resistant temperature of a seal member used in the hydraulic device. When the hydraulic device is heated, the blocking member is removed from the throttle flow path before the seal member is damaged, and the working fluid flows from the high pressure chamber to the low pressure chamber. Is self-cooled and suppresses temperature rise.

  According to the invention, the hydraulic device is a hydraulic cylinder, and the throttle channel is formed to penetrate the piston, and the throttle channel is used for the hydraulic cylinder above the upper limit temperature of the hydraulic cylinder. Since the sealing member is closed by a low melting point metal that melts below the heat resistance temperature of the sealing member, when the hydraulic cylinder is heated, the closing member is removed from the throttle channel before the sealing member is damaged, The working fluid flows into the low-pressure chamber, and the hydraulic cylinder is self-cooled by the working fluid to suppress the temperature rise.

  According to the invention, the hydraulic device is a hydraulic cylinder, and the high-pressure chamber and the low-pressure chamber are communicated with each other by a bypass flow path, and the bypass flow path is used for the hydraulic cylinder above a use upper limit temperature of the hydraulic cylinder. Since the sealing member is closed by a low melting point metal that melts below the heat resistance temperature of the sealing member, when the hydraulic cylinder is heated, the closing member is removed from the throttle channel before the sealing member is damaged, The working fluid flows into the low pressure chamber, and the hydraulic cylinder is self-cooled by the working fluid. In addition, since the bypass flow path is provided in a state exposed to the outside of the hydraulic cylinder body, it is easily affected by heat and exhibits the excellent effect that the blocking member is reliably eliminated.

It is the schematic which shows the 1st Example of this invention. It is the schematic which shows the 2nd Example of this invention. It is a principal part schematic diagram which shows the 3rd Example of this invention. It is a principal part schematic diagram which shows the 4th Example of this invention.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 shows a schematic configuration of a hydraulic cylinder 1 in which the present invention is implemented.

  In FIG. 1, 2 is a cylinder tube, 3 is a piston, 4 is a piston rod, and the cylinder tube 2 is liquid-tightly partitioned by the piston 3 into a first chamber 5 and a second chamber 6, and the first chamber A first pipe 7 communicates with 5, and a second pipe 8 communicates with the second chamber 6. High pressure oil is supplied to the first chamber 5 and the second chamber 6 in accordance with the expansion and contraction of the hydraulic cylinder 1. Therefore, the high pressure chamber and the low pressure chamber are adjacent to each other with the piston 3 as a boundary.

  When high-pressure oil is supplied to the first chamber 5 through the first pipe 7, the piston 3 moves to the right in the figure, and the hydraulic cylinder 1 extends. When high pressure oil is supplied to the second chamber 6 through the second pipe 8, the piston 3 moves to the left in the figure, and the hydraulic cylinder 1 is shortened. Sealing materials 12 and 13 are provided on the sliding surface of the piston 3 and the portion of the cylinder tube 2 through which the piston rod 4 penetrates, and the sealing materials 12 and 13 have a heat resistance of, for example, 250 ° C. to 300 ° C. It has sex.

  The piston 3 is provided with a first throttle channel 10 and a second throttle channel 11, and both the first throttle channel 10 and the second throttle channel 11 are shafts of the piston 3. The first chamber 5 and the second chamber 6 are communicated with each other in the center direction.

  The first throttle channel 10 has a smaller diameter than the second throttle channel 11, and always communicates the first chamber 5 and the second chamber 6. On the other hand, the second throttle channel 11 is closed by a meltable closing member, for example, a solder 14 which is a low melting point metal.

  The solder 14 is melted at a melting point higher than the upper limit temperature of use of the hydraulic cylinder 1 and lower than the heat resistance temperature of the sealing materials 12, 13. For example, the upper limit temperature of use of the hydraulic cylinder 1 is 155 ° C. When the temperature is set to ˜200 ° C., the solder 14 is selected to melt at, for example, 155 ° C. to 250 ° C.

  In this embodiment, it is assumed that the solder 14 that melts at about 250 ° C. is used. The diameter of the second throttle channel 11 is such that the first chamber 5 and the second chamber 6 communicate with each other through the second throttle channel 11, and the second throttle channel 11 has a low pressure side to a high pressure side. The flow rate is set so as to be limited so that the function of the hydraulic cylinder 1 is not impaired even when hydraulic oil flows through the hydraulic cylinder.

  Normally, the second throttle channel 11 is closed, only the first throttle channel 10 communicates the first chamber 5 and the second chamber 6, and a slight amount of hydraulic oil is in the first chamber. It leaks from the high pressure side to the low pressure side of the first chamber 5 and the second chamber 6 through the throttle channel 10. Since a small amount of hydraulic fluid flows between the first chamber 5 and the second chamber 6, the hydraulic oil does not stay in the first chamber 5 and the second chamber 6 for a long period of time and deteriorates as a working fluid. Can be prevented. In particular, it is possible to prevent deterioration due to temperature when the hydraulic cylinder 1 is used in a high temperature environment, for example, 100 ° C. Further, since the leak amount by the first throttle channel 10 is small, the controllability of the hydraulic cylinder 1 is not deteriorated.

  When the working fluid does not deteriorate depending on the usage environment, the first throttle channel 10 may be omitted.

  Next, if a fire or the like occurs and the hydraulic cylinder 1 is exposed to a flame and the temperature of the hydraulic cylinder 1 or hydraulic oil exceeds 250 ° C., the solder 14 melts and melts. The solder 14 is extruded from the high pressure side to the low pressure side by the hydraulic oil, the second throttle channel 11 passes through, and the hydraulic oil flows out from the high pressure side to the low pressure side.

  When the hydraulic oil flows from the high pressure side to the low pressure side, the cylinder tube 2 and the piston 3 are cooled by the hydraulic oil, and the cylinder tube 2, the piston 3, the piston rod 4, that is, the sealing materials 12 and 13. Suppresses the temperature rise. Therefore, the burning of the sealing materials 12 and 13 is prevented or delayed, the leakage of hydraulic oil due to the burning of the sealing materials 12 and 13 is prevented, and the ignition and fire spread from the hydraulic cylinder 1 are prevented.

  Further, even if the solder 14 is melted and the second throttle channel 11 is in a penetrating state, the second throttle channel 11 restricts the flow rate, so that the control performance is reduced. The function of the cylinder 1 is not completely lost.

  FIG. 2 shows a second embodiment. In FIG. 2, the same components as those shown in FIG.

  In the second embodiment, a bypass channel 15 having a function equivalent to that of the second throttle channel 11 is provided, and the first chamber 5 and the second chamber 6 are communicated with each other by the bypass channel 15. The required positions 15 are closed by the solder 14.

  Also in the second embodiment, when the bypass passage 15 is heated and exceeds a predetermined temperature, the solder 14 is melted and discharged, and the inside of the first chamber 5 and the second chamber 6 is The hydraulic fluid flows from the high pressure side toward the low pressure side, and cools the cylinder tube 2, the piston 3, and the piston rod 4.

  Further, since the bypass flow path 15 is provided outside the cylinder tube 2, the bypass flow path 15 itself is directly exposed to the flame, so that the solder 14 is more reliably melted and the flow of the working oil is more reliably performed. Is obtained.

  FIG. 3 shows a third embodiment. In FIG. 3, the same components as those shown in FIG.

  In the third embodiment, the first throttle channel 10 and the second throttle channel 11 are formed concentrically. That is, the second throttle channel 11 is penetrated through the piston 3, the second throttle channel 11 is closed with the solder 14, and the first throttle channel 10 is further drilled in the solder 14.

  At a constant time, there is a slight leak due to the first throttle channel 10, and in the event of a fire, the solder 14 is melted and discharged, the first chamber 5 and the second chamber 6 communicate with each other, and the second throttle The flow of hydraulic oil is ensured through the flow path 11.

  In the third embodiment, since the first throttle channel 10 formed in the piston 3 can be omitted, the cost can be reduced. In the use environment where the working fluid does not deteriorate, the first throttle channel 10 may be omitted.

  FIG. 4 shows a fourth embodiment. In FIG. 4, the same components as those shown in FIG. In the fourth embodiment, the first throttle channel 10 is omitted.

  A second throttle channel 11 is drilled in the piston 3, and a counterbore hole 16 is drilled at the end of the second throttle channel 11 on one end side (the first chamber 5 side in the drawing). A channel closing lid 17 is embedded in the counterbore 16 in a liquid-tight manner.

  The means for fixing the flow path closing lid 17 to the counterbore hole 16 is, for example, soldering. When the solder melts, the flow path blockage lid 17 falls off the counterbore hole 16, and the first The first throttle chamber 5 and the second chamber 6 communicate with each other through the two throttle channels 11.

  The flow path closing lid 17 may be a magnet. The magnet has the property that the temperature rises and the magnetic force suddenly decreases or disappears at a predetermined temperature. For example, if a magnet whose magnetic force decreases rapidly at 250 ° C. is selected and used, the sealing material Before the 12 burns out, the adsorptive power is lost, the pressure drops due to the differential pressure between the first chamber 5 and the second chamber 6, and the second throttle channel 11 is opened to ensure the flow of hydraulic oil.

  As described above, in the present invention, a flow path that connects the first chamber 5 and the second chamber 6 is formed, the flow path is closed with a closing member, and the closing member exceeds a predetermined temperature. , Configured to open the flow path. Therefore, the second throttle channel 11 only needs to communicate the first chamber 5 and the second chamber 6, and the second throttle channel 11 may be formed inside the piston rod 4.

DESCRIPTION OF SYMBOLS 1 Hydraulic cylinder 2 Cylinder tube 3 Piston 4 Piston rod 5 1st chamber 6 2nd chamber 7 1st piping 8 2nd piping 10 1st throttle channel 11 2nd throttle channel 12, 13 Sealing material 14 Solder 15 Bypass channel 16 Counterbore hole 17 Channel blockage lid

Claims (5)

  In a hydraulic device in which a flammable liquid is used as a working fluid and the working fluid is supplied to adjacent high-pressure chambers and low-pressure chambers, the high-pressure chamber and the low-pressure chamber are communicated with each other by a throttle channel. The flow path is closed by a closing member, and the closing member is configured to be excluded from the throttle flow path at a temperature equal to or higher than a use upper limit temperature of the hydraulic device and a heat resistance temperature of a seal member used in the hydraulic device. A fireproof structure for hydraulic equipment.   The hydraulic device is a hydraulic cylinder, and the throttle channel is formed to penetrate the piston, and the throttle channel is equal to or higher than the upper limit temperature of use of the hydraulic cylinder and the heat resistance of the seal member used in the hydraulic cylinder. The fireproof structure for hydraulic equipment according to claim 1, which is closed by a low melting point metal that melts at a temperature lower than the temperature.   The hydraulic device is a hydraulic cylinder, and the high pressure chamber and the low pressure chamber are communicated by a bypass flow path, and the bypass flow path is equal to or higher than a use upper limit temperature of the hydraulic cylinder and heat resistance of a seal member used in the hydraulic cylinder. The fireproof structure for hydraulic equipment according to claim 1, which is closed by a low melting point metal that melts at a temperature lower than the temperature.   The hydraulic device is a hydraulic cylinder, the throttle channel is formed to penetrate the piston, the throttle channel is liquid-tightly closed by a channel block lid, and the channel block lid is 2. The fireproof structure for a hydraulic device according to claim 1, wherein the fireproof structure is fixed to the piston with a low melting point metal that melts at a temperature not lower than a use upper limit temperature and not higher than a heat resistance temperature of a seal member used in the hydraulic cylinder.   The hydraulic device is a hydraulic cylinder, the throttle channel is drilled to penetrate the piston, the throttle channel is liquid-tightly closed by a channel block lid, and the channel block lid is a magnet, The adsorbing force is reduced below the force due to the differential pressure between the high pressure chamber and the low pressure chamber and drops off at a temperature not lower than the upper limit temperature of the hydraulic cylinder and not higher than the heat resistance temperature of the seal member used in the hydraulic cylinder. The fireproof structure for hydraulic equipment according to claim 1.

Images