JP3667506B2 - Pressurized reservoir - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement of a pressurized reservoir mounted on an aircraft or the like.
[0002]
[Prior art]
A hydraulic circuit such as an aircraft is provided with a pressurized reservoir 100 as shown in FIG.
[0003]
As shown in the figure, in this pressurized reservoir 100, a bootstrap piston 102 is fixed on the central axis of a cylindrical casing 101, and a bootstrap cylinder 103 is slidably disposed on the outer periphery of the bootstrap piston 102. Is done. A separator 104 that divides the casing 101 along a plane orthogonal to the central axis is fixed to the end of the bootstrap cylinder 103. A tank chamber 106 is defined between the separator 104 and the end plate 105 of the casing 101. When the bootstrap cylinder 103 extends to the opposite side of the end plate 105, the tank chamber 106 expands. .
[0004]
The tank chamber 106 communicates with a hydraulic circuit (not shown) via a port 107. Further, hydraulic pressure is introduced into the cylinder chamber 108 between the bootstrap piston 102 and the bootstrap cylinder 103 via a hydraulic pressure introduction passage 109 that opens to the end face plate 105. By this hydraulic pressure, the bootstrap cylinder 103 is urged in a contracting direction, and the hydraulic oil in the tank chamber 106 is pressurized to a predetermined pressure.
[0005]
With such a configuration, the pressurized reservoir 100 absorbs the change in the amount of hydraulic oil in the hydraulic circuit into the tank chamber 106 via the port 107, and the pressure in the hydraulic circuit is constant and equal to that in the tank chamber 106. Has the ability to hold on to the pressure.
[0006]
[Problems to be solved by the invention]
By the way, in order to ensure safety in the event of a reservoir failure, an aircraft or the like includes a pressurized reservoir 100 as a reservoir for a normally used hydraulic circuit, and is used instead of the normal hydraulic circuit when the normal hydraulic circuit is used. It is customary to provide the same pressurized reservoir 100 with respect to the emergency hydraulic circuit.
[0007]
However, the provision of the pair of pressure type reservoirs 100 for normal use and emergency use as described above increases the weight of the entire hydraulic device including the reservoir, and as a device mounted on an aircraft that is particularly required to be reduced in weight. Is not appropriate. Further, the pair of pressurized reservoirs 100 monopolizes a wide space in an aircraft that has a limited space, which is against the requirement for space saving.
[0008]
Further, both of the pair of pressurizing reservoirs 100 require electrical components such as an oil amount detector and a pressure switch, and various components, which makes maintenance difficult and causes high costs. .
[0009]
The present invention has been made paying attention to such problems, and is a pressurized reservoir connected to a hydraulic circuit having a normal circuit and an emergency circuit, which can be reduced in size and weight, and can be maintained. It aims at providing what can improve.
[0010]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided a pressurization-type reservoir comprising a variable-capacity tank chamber and a defining member that defines the tank chamber and is free to move so as to pressurize the hydraulic oil in the tank chamber. Valve means for selectively communicating with the normal hydraulic circuit, communication means for always communicating the tank chamber with the emergency hydraulic circuit, and valve closing for closing the valve means when the amount of hydraulic oil in the tank chamber falls below a predetermined value Means.
[0011]
In a second aspect of the invention, the valve closing means includes a valve closing member that extends and retracts from the defining member and a biasing means that biases the valve closing member in the protruding direction. When the tank chamber moves by a predetermined amount or more in the direction of decreasing capacity, the valve closing member presses the valve means to close the valve means.
[0012]
In a third aspect of the invention, the valve means is a telescopic valve that contracts in two stages, and when the defining member moves a predetermined amount or more in a direction in which the capacity of the tank chamber decreases, the telescopic valve is The valve is closed by contracting one step.
[0013]
Operation and effect of the invention
In the first aspect of the invention, the normal hydraulic circuit communicates with the tank chamber through the valve means at normal times. Therefore, the change in the amount of hydraulic oil in the normal hydraulic circuit is variable in capacity by the movement of the defining member. Absorbed by the tank chamber, the pressure of the normal hydraulic circuit is maintained at the same predetermined pressure as the tank chamber. On the other hand, when a failure occurs in which hydraulic fluid leaks out from the normal hydraulic circuit, hydraulic fluid flows out from the tank chamber and the amount of hydraulic fluid in the tank chamber decreases. In this manner, when the amount of hydraulic oil in the tank chamber decreases beyond a predetermined value, the valve closing means closes the valve means and disconnects the tank chamber from the normal hydraulic circuit. At this time, a predetermined amount of hydraulic oil still remains in the tank chamber, and the tank chamber communicates with the emergency hydraulic circuit via the communication means. The reservoir functions as in a normal hydraulic circuit.
[0014]
As described above, according to the present invention, since one pressurization type reservoir can serve as both a normal reservoir and an emergency reservoir, it is not necessary to provide two pressurization reservoirs, and the configuration of the entire hydraulic apparatus including the pressurization reservoirs The number of parts can be reduced, and the weight of the entire hydraulic device can be reduced and the arrangement space can be reduced. Furthermore, maintenance of the hydraulic device is facilitated by the fact that there is only one pressurized reservoir.
[0015]
In the second invention, when the hydraulic fluid leaks from the normal hydraulic circuit, the hydraulic fluid in the tank chamber is reduced, and when the defining member moves correspondingly, the valve closing member protruding from the defining member becomes the valve means. Press to close.
[0016]
In the third aspect of the invention, when the hydraulic oil flows out of the tank chamber in an emergency and the defining member that defines the tank chamber moves by a predetermined amount or more, the defining member contracts the telescopic valve by one step and closes the valve. As a result, the communication between the tank chamber and the normal hydraulic circuit is cut off. In this case, since the telescopic valve can be contracted by one more stage, the defining member can move further, and the capacity of the tank chamber is variable. Therefore, the pressurized reservoir functions as a reservoir for the emergency hydraulic circuit. To do. As described above, in the third aspect of the invention, the configuration other than the valve means can be simplified by using the telescopic valve as the valve means.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
[0018]
FIG. 1 shows a pressurized reservoir 1 according to a first embodiment of the present invention.
[0019]
As shown in the figure, a bootstrap piston 3 is fixed on the central axis of a cylindrical casing 2 of the pressurized reservoir 1. The bootstrap cylinder 4 that accommodates the bootstrap piston 3 is slidable in the axial direction of the bootstrap piston 3.
[0020]
In FIG. 1, for convenience, the state in which the bootstrap cylinder 4 is contracted most is shown in the upper half of the reservoir 1, and the state in which the bootstrap cylinder 4 is most extended is shown in the half of the reservoir 1. In this fully extended state, the flange portion 4A at one end of the bootstrap cylinder 4 abuts on the flange portion 3A at one end of the bootstrap piston 3, so that the extension of the bootstrap cylinder 4 is restricted.
[0021]
A cylinder chamber 13 formed between the flange 4A at the base end of the bootstrap cylinder 4 and the bootstrap piston 3 and the flange 4B has a bootstrap piston 14 through a hydraulic introduction hole 14 formed in the end face plate 8. The oil pressure is guided through the oil passage 3A formed in the cylinder 3, and the bootstrap cylinder 4 is moved in the contracting direction by the expansion of the cylinder chamber 14 by the introduction of the oil pressure.
[0022]
A connecting member 6 is fixed to the outer periphery of the bootstrap cylinder 4, and a separator 7 that divides the inside of the casing 1 in a cross section orthogonal to the axis is fixed to the tip of the connecting member 6. The separator 7 is a defining member that defines the tank chamber 10, and the tank chamber 10 is defined between the separator 7 and the end face plate 8 of the casing 2. As will be described later, the pressurized reservoir 1 serves as both a reservoir for the normal hydraulic circuit and a reservoir for the emergency hydraulic circuit. Therefore, the size of the tank chamber 10 is, for example, the conventional one shown in FIG. A capacity approximately twice that of the tank chamber 106 of the reservoir of the hydraulic circuit is secured.
[0023]
A cylindrical sub-piston 11 is slidably accommodated between the bootstrap cylinder 4 and the connecting member 6. The sub-piston 11 is a valve closing member that presses a later-described valve 20. The sub-piston 11 protrudes by a predetermined amount toward the end face plate 8 and is biased toward the end face plate 8 by a spring 12.
[0024]
The end face plate 8 is provided with a port 15 having a port 15 that always communicates the tank chamber 10 with the emergency hydraulic circuit, and a port 20 having a port 16 that communicates the tank chamber 10 with the normal hydraulic circuit.
[0025]
The valve 20 has an inner cylinder 22 accommodated in an outer cylinder 21, and the inner periphery of the outer cylinder 21 is a port 15. The inner cylinder 22 is urged by a spring 23 so as to protrude toward the tank chamber 10, and an opening 22A formed in a part of the inner cylinder 22 is looked into the tank chamber 10 and the opening 22A is passed through the opening 22A. Thus, the tank chamber 10 and the port 15 communicate with each other.
[0026]
Furthermore, a plate 22B capable of closing the tank chamber 10 side end of the outer cylinder 21 is provided at the end of the inner cylinder 22A protruding toward the tank chamber 10 side. When the plate 11A at the end of the sub-piston 11 comes into contact with the plate 22B due to the contraction of the bootstrap cylinder 4, the inner cylinder 22 is pushed into the outer cylinder 21 against the spring 23, and the opening 22A is formed in the outer cylinder 21. As a result of being housed inside and closing the end of the outer cylinder 21 with the plate 22B, the communication between the tank chamber 10 and the normal hydraulic circuit is cut off.
[0027]
Next, the operation will be described.
[0028]
The tank chamber 10 of the pressurizing reservoir 1 communicates with the normal hydraulic circuit through the port 16 of the opened valve 20 in the normal state (when the normal hydraulic circuit is not broken), and the port 15 It communicates with the emergency hydraulic circuit via Since the tank chamber 10 is pressurized to a predetermined pressure by the hydraulic pressure introduced from the hydraulic pressure introduction hole 14, the pressurizing reservoir 1 absorbs the change in the amount of hydraulic oil in the normal hydraulic circuit, and It functions to maintain the pressure of the hydraulic circuit at the same predetermined pressure as the tank chamber 10. In this case, since the emergency hydraulic circuit is not operated, the emergency hydraulic circuit does not affect the function of the pressurized reservoir 1 as a reservoir with respect to the normal hydraulic circuit.
[0029]
Here, it is assumed that a failure has occurred in which hydraulic fluid leaks from the normal hydraulic circuit. In such an emergency, the bootstrap cylinder 4 of the pressurized reservoir 1 contracts as hydraulic fluid leaks from the normal hydraulic circuit.
[0030]
When the hydraulic oil flows out of the tank chamber 10 in this way, the plate 11A at the tip of the sub-piston 11 eventually comes into contact with the plate 22B, and the inner cylinder 22 of the valve 20 is pushed into the outer cylinder 21 against the spring 23. It is done. Thereby, the plate 22B closes the end of the outer cylinder 21, the valve 20 is closed, and further outflow of hydraulic oil from the tank chamber 10 to the normal hydraulic circuit is prevented.
[0031]
The urging force of the spring 12 that urges the sub-piston 11 is set larger than the urging force of the spring 23 of the valve 20 so that the sub-piston 11 can push the inner cylinder 21 of the valve 20 in this way. Keep it.
[0032]
When the valve 20 is closed in this way, the tank chamber 10 has a capacity corresponding to the protruding stroke of the sub-piston 11 from the separator 7, and the tank chamber 10 has an emergency via the port 15. It remains in communication with the hydraulic circuit. Further, the bootstrap cylinder 4 (separator 7) can be further contracted to the end face plate 8 side against the spring 12, and the tank chamber 10 is predetermined according to the oil pressure introduced through the oil pressure introduction hole 14. The pressure can be increased. Therefore, the pressurization type reservoir 1 can function as a reservoir for the emergency hydraulic circuit in the same manner as it normally functions as a reservoir for the normal hydraulic circuit.
[0033]
Thus, according to the present invention, since one pressurization type reservoir 1 can serve as both a normal use and an emergency use reservoir, it is not necessary to provide two pressurization type reservoirs. Therefore, it is possible to reduce the number of components of the entire hydraulic device mounted on an aircraft or the like, and it is possible to reduce the weight of the entire hydraulic device and reduce the arrangement space. Furthermore, the maintenance of the hydraulic device is facilitated as the pressure type reservoir 1 becomes one.
[0034]
Further, in the present invention, as described above, the communication between the normal hydraulic circuit and the pressurized reservoir 1 is cut off, that is, the switching to the emergency mode is automatically performed by reducing the amount of hydraulic fluid in the tank chamber 10 of the pressurized reservoir 1. Therefore, human error does not occur in switching to the emergency mode, and switching is performed reliably and accurately.
[0035]
Further, when returning from the emergency mode in which the emergency hydraulic circuit is used to the normal mode in which the normal hydraulic circuit is used, a sufficient amount of hydraulic oil to extend the bootstrap cylinder 4 again is supplied to the tank chamber 10. It only needs to be supplied inside, the return work is easy, and no special equipment is required.
[0036]
FIG. 2 shows a second embodiment of the present invention.
[0037]
As shown in the figure, in the pressurized reservoir 30 of this embodiment, compared with the configuration of the pressurized reservoir 1 of the first embodiment shown in FIG. The valve 20 provided therebetween is changed to a telescopic valve 40. Thereby, the separator 7 is directly attached to the bootstrap cylinder 4, and the sub piston 11, the connecting member 6, and the spring 12 in the first embodiment are unnecessary, and the configuration is simplified.
[0038]
More specifically, the telescopic valve 40 includes an outer cylinder 41, an intermediate cylinder 42 slidably accommodated in the outer cylinder 41, and an inner cylinder slidably accommodated in the intermediate cylinder 42. 43. The intermediate cylinder 42 is biased by a spring 44 in a direction protruding from the outer cylinder 41 toward the tank chamber 10, and the inner cylinder 42 is biased by a spring 45 in a direction protruding from the intermediate cylinder 32 toward the tank chamber 10. Has been.
[0039]
In this case, the urging force of the spring 44 is set larger than the urging force of the spring 45. Thus, when the valve 40 contracts against the urging force of the springs 44 and 45, the inner cylinder 43 is first accommodated in the intermediate cylinder 42, and then the intermediate cylinder 42 is accommodated in the outer cylinder 41. It is like that.
[0040]
As described above, the intermediate cylinder 42 is accommodated in the outer cylinder 41 and the inner cylinder 43 is accommodated in the intermediate cylinder 42, so that the entire valve 40 is contracted. However, in FIG. The most contracted state is shown in the upper half of the pressurizing reservoir 1, and the state where the valve 40 is most extended is shown in the lower half of the pressurizing reservoir 1.
[0041]
A port 31 is fixed to the inner periphery of the end of the outer cylinder 41 opposite to the tank chamber 10, and this port 31 communicates with a normal hydraulic circuit. Further, an opening 43A is formed on the side surface of the inner cylinder 43 that protrudes toward the tank chamber 10, and when the inner cylinder 43 is not contracted into the intermediate cylinder 42, the tank chamber 10 passes through the inner cylinder 43 from the opening 43A. The port 31 communicates with the intermediate cylinder 42 and the outer cylinder 41.
[0042]
In addition, a plate 43B is fixed to the end of the inner cylinder 43 that protrudes into the tank chamber 10, and the separator 7 abuts against the plate 43B, so that the inner cylinder 43 resists the spring 45 and is within the intermediate cylinder 42. The plate 43B closes the end of the intermediate cylinder 42, and hydraulic oil cannot flow through the opening 42A. In this way, when the hydraulic fluid leaks from the failed normal hydraulic circuit and the hydraulic fluid in the tank chamber 10 decreases until the bootstrap cylinder 4 contracts by a predetermined amount or more, the valve 40 is closed, Communication between the hydraulic circuit for use and the tank chamber 10 is cut off.
[0043]
Thus, even after the communication between the normal hydraulic circuit and the tank chamber 10 is cut off, the tank chamber 10 communicates with the emergency hydraulic circuit via the port 15 not shown in FIG. Functions as a reservoir for the emergency hydraulic circuit. Therefore, also in the present embodiment, as in the first embodiment, the pressurizing reservoir 30 that serves as the reservoir for the normal and emergency hydraulic circuits can be configured to be lightweight and compact. The spring 44 of the valve 40 functions in the same manner as the spring 12 in the first embodiment, and helps to keep the valve 40 in a closed state.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a first embodiment of the present invention.
FIG. 2 is a cross-sectional view showing a second embodiment in the same manner.
FIG. 3 is a cross-sectional view showing a conventional pressurized reservoir.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Pressurization type | mold reservoir | reserver 2 Casing 3 Bootstrap piston 4 Bootstrap cylinder 6 Connecting member 7 Separator 8 End surface plate 10 Tank chamber 11 Sub piston 12 Spring 13 Cylinder chamber 14 Oil pressure introduction hole 15 Port 16 Port 20 Valve 21 Outer cylinder 22 Inner cylinder 22A Opening 22B Plate 23 Spring 30 Pressure type reservoir 31 Port 40 Valve 41 Outer cylinder 42 Intermediate cylinder 43 Inner cylinder 43A Opening 43B Plate 44 Spring 45 Spring

Claims (3)

A tank chamber with variable capacity,
A defining member that defines the tank chamber and is movable so as to pressurize the hydraulic fluid in the tank chamber;
In a pressurized reservoir with
Valve means for selectively communicating the tank chamber with a normal hydraulic circuit;
Communication means for always communicating the tank chamber with an emergency hydraulic circuit;
A valve closing means for closing the valve means when the amount of hydraulic oil in the tank chamber becomes a predetermined value or less;
A pressurizing reservoir characterized by comprising: The valve closing means includes a valve closing member that protrudes from the defining member in a telescopic manner, and an urging means that urges the valve closing member in the protruding direction, and the defining member has a capacity of the tank chamber. 2. The pressurized reservoir according to claim 1, wherein the valve closing member closes the valve means when the valve closing member presses the valve means when moving in a decreasing direction by a predetermined amount or more. The valve means is a telescopic valve that contracts in two stages, and when the defining member moves a predetermined amount or more in a direction in which the capacity of the tank chamber decreases, the telescopic valve contracts by one stage. 2. The pressurized reservoir according to claim 1, wherein the valve is closed.

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