JPH10281003A - Passage closing gear and its sealing structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a passage closing gear and its sealing structure which can be used in a high temperature part and are capable of adapting to large heat distortion. SOLUTION: The gear is equipped with a flap 12 which opens or closes an opening 5 provided on a passage, and the flap 12 consists of a sealing plate 14 which contacts the opening 5 and seals a seal area 5a, and a support plate 16 which is driven by an opening/closing gear 20. The sealing plate 14 is mounted with a space left away from and approximately in parallel to the support plate 16 while allowing the free movement of the sealing plate 14. Further, leaf springs 18 are sandwiched between the sealing plate 14 and the support plate 16 so that the sealing plate 14 is always pushed in direction to move away from the support plate 16. The force of the leaf springs 18 is preset to a value which is larger than the operating force required to seal the opening 5 when closing the passage, so even if the clearance between the flap 12 and the opening 5 varies, the elastic force of the leaf springs 18 causes the clearance between the sealing plate 14 and the support plate 16 to change, and the sealing plate 14 and the opening 5 are always kept in firmly joined condition and the sealable property is maintained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow passage opening / closing device and a seal structure thereof, and more particularly, to a flow passage opening / closing device of a combined cycle engine and a seal structure thereof.

[0002]

2. Description of the Related Art A combined cycle engine is an aviation engine in which a turbojet engine and a ramjet engine are combined. In a low Mach region (for example, Mach 3 or less), the combined cycle engine functions as a turbojet engine and a high Mach region (for example, (Mach 3 and above) function as a ramjet engine.

FIG. 3 is an overall configuration diagram of such a combined cycle engine, which comprises a core engine 1, a bypass duct 2 surrounding the core engine 1, a ram combustor 3 located behind the core engine 1, and an exhaust nozzle 4. . The core engine 1 includes a fan 1a, a compressor 1b, a combustor 1c, a turbine 1d, and the like.
And the fuel is burned in the combustor 1c and the turbine 1d
To drive the fan 1a and the compressor 1b to rotate, and to jet a jet from the exhaust nozzle 4 to generate a thrust.

On the other hand, as shown in FIG. 3, an MSV (mode selector valve) is provided on the front side of the bypass duct 2, and its flap 2a is opened in a high Mach region.
The high-speed air compressed by the ram pressure is introduced into the ram combustor 3 through the bypass duct 2, where the fuel is burned, expanded by the exhaust nozzle 4 and ejected rearward to generate thrust. In the high Mach region where the ram combustor 3 operates, the fuel supply to the core engine 1 is stopped,
The core engine 1 stops operating and idles.

The above-described combined cycle engine generates high thrust even at a low speed of Mach 1 or less, can take off on its own, and can fly supersonic at Mach 5 or more like a ramjet, as compared with a ramjet engine. There is.

[0006]

In the above-described conventional combined cycle engine, the flap 2a of the bypass duct 2 has a Mach region (for example, Mach 3) for switching between a turbojet engine and a ramjet engine.
Opening and closing). In this speed range, fan 1
The temperature of the air compressed by a is high (about 400 ° C.), and the bypass duct 2 also thermally expands at this temperature. Therefore, such a flap must withstand a high temperature of about 400 ° C. and follow deformation due to thermal expansion of the sealing surface (for example, about 3 mm in the radial direction).

As a seal structure of a conventional flap type flow path opening and closing device, a rubber O-ring is used for a low temperature part (300 ° C. or less) and a metal seal such as an E seal is used for a high temperature part (300 ° C. or more). Generally, the elasticity of the sealing member follows the deformation of the sealing surface. However, rubber-based O-rings have relatively large deformation followability, but cannot be used in high-temperature parts.
On the other hand, the metal seal can be used in a high-temperature portion, but cannot be used in a place having a small deformation followability (1 mm or less) and a large deformation.

That is, the conventional seal structure in which the sealing member such as an O-ring or an E-seal is directly pressed against the sealing surface to follow the deformation of the sealing surface cannot satisfy both the heat resistance and the thermal deformation followability. there were.

The present invention has been made to solve such a problem. That is, an object of the present invention is to provide a flow passage opening / closing device which can be used in a high-temperature portion and can follow a large thermal deformation, and a seal structure thereof.

[0010]

According to the present invention, there is provided a flap for opening and closing an opening provided in a flow path, the flap being in contact with the opening, sealing the opening and closing the flow path. The seal plate includes a seal plate and a support plate driven by an opening / closing drive device. The seal plate is mounted at a distance from the support plate and substantially parallel to the support plate so as to be freely movable, and further supports the seal plate. A leaf spring is sandwiched between the seal plate and the support plate so as to always urge in the direction away from the plate,
The biasing force of the leaf spring in a state where the sealing plate is in contact with the opening is set to be larger than the acting force required for sealing the opening when the flow path is closed. 2. A seal structure according to (1) is provided.

According to the structure of the present invention, since the flap itself has a double structure including the seal plate and the support plate,
When the flap is closed by driving the support plate by the opening / closing drive device, the seal plate attached to the support plate contacts the opening to close the opening (flow path). The seal plate is attached to the support plate at a distance from the support plate and substantially parallel to the support plate so as to be freely movable, and is constantly urged away from the support plate by a plate spring between the support plate and the support plate. Since the deformation can follow relatively large thermal deformation of the opening and the seal plate itself can be freely formed of a material having high heat resistance (for example, a metal plate), it is sufficiently used even in a high-temperature portion of 400 ° C. or more. be able to.

Therefore, even if the gap between the flap and the fixed portion (opening) changes, the gap between the two flaps (seal plate and support plate) changes due to the elastic force of the spring, and the flap and the opening always remain. The state of close contact is maintained, and the sealing property is ensured.

According to the present invention, there are provided a plurality of flaps for opening and closing a plurality of openings arranged at intervals in the circumferential direction in the flow path, and an opening / closing drive device for driving the flaps. The flap includes a seal plate that contacts the opening to seal the opening and seal the flow path, and a support plate driven by the opening / closing drive device.The seal plate is spaced from the support plate and attached to the support plate. A leaf spring is sandwiched between the seal plate and the support plate so as to always urge the seal plate in a direction away from the support plate. The opening / closing drive device includes a plurality of links each having an inner end pivotally attached to a support plate of each flap, and an outer end of the link pivotally attached to the support plate of each flap. A single ring attached and a flow path The actuator is made to move back and forth along the axis, and the biasing force of the leaf spring when the seal plate is in contact with the opening is larger than the acting force required to seal the opening when closing the flow path. A flow path opening / closing device is provided.

According to this configuration of the present invention, the actuator causes the single ring to move back and forth along the axis of the flow path,
By moving the ring, a plurality of flaps can be opened and closed in conjunction with each other via a plurality of links, and a plurality of openings arranged in a flow path in a circumferential direction can be simultaneously opened and closed, thereby opening and closing the flow path. be able to.

[0015]

Preferred embodiments of the present invention will be described below with reference to the drawings. In each of the drawings, common portions are denoted by the same reference numerals, and redundant description will be omitted. FIG. 1 is a front view of a combined cycle engine using a flow passage opening / closing device according to the present invention. As shown in this figure, in the combined cycle engine shown in FIG. 3, a plurality of openings 5 are arranged at intervals in the circumferential direction in the flow path of the bypass duct. Outside the flow path of the bypass duct, four actuators 26 to be described later are arranged at intervals in the circumferential direction.

FIG. 2 is a partial sectional view taken along line AA of FIG. As shown in this figure, a flow path opening and closing device 10 of the present invention includes a plurality of flaps 12 for opening and closing a plurality of openings 5, and an opening and closing driving device 20 for driving the flaps 12.
Consists of Each flap 12 includes a seal plate 14 that contacts the opening and seals the sealing surface 5 a of the opening 5, and a support plate 16 driven by the opening and closing drive device 20. The front edge portion of the support plate 16 is attached to the bypass duct so as to be swingable about a rotation axis 16a orthogonal to the axis Z-Z of the flow path.

Further, as shown in FIG.
0 comprises a plurality of links 22, a single ring 24, and an actuator 26. Link 22 is connected to each flap 1
The inner end 22 a is pivotally connected to the second support plate 16, and the outer end 22 b is connected to a single ring 24. Also,
The actuator 26 connects the ring 24 to the axis ZZ of the flow path.
Along the way back and forth.

With the above-described configuration, the actuator 26
Causes the single ring 24 to move back and forth along the axis Z-Z of the flow path.
, A plurality of flaps 12 can be interlocked with each other to simultaneously open and close a plurality of openings 5 circumferentially arranged in the flow path.

As shown in FIG. 2, the seal plate 14 and the support plate 16 are connected by a connecting rod 15 penetrating both. The connecting rod 15 penetrates through holes and screw holes provided in the seal plate 14 and the support plate 16, and the enlarged portions provided at both ends prevent the two from being separated from each other beyond a predetermined range. ing. With this configuration, the sealing plate 14
Is located at an appropriate distance from the support plate 16 and
Are mounted substantially in parallel so as to be freely movable. This interval is set sufficiently larger than the amount of deformation of the seal portion.

Further, the seal plate 14 and the support plate 16 are always urged in a direction away from the support plate 16.
A leaf spring 18 is sandwiched between them. This leaf spring 18
In this embodiment, two pairs of flat springs (only one pair on one side is shown in FIG. 2) are formed in this embodiment, the tops of each pair are in contact with each other, and both ends are respectively formed with the sealing plate 14. In contact with the support plate 16, the seal plate 14 is urged in a direction away from the support plate 16. The urging force of the leaf spring 18 in a state where the sealing plate 14 is in contact with the opening 5 is set to be sufficiently larger than the acting force required for sealing the sealing surface 5 a of the opening 5, or is pressed by the actuator 26.

According to the configuration of the present invention described above, the flap 12 itself has a double structure including the seal plate 14 and the support plate 16, so that the opening / closing drive device 20 controls the support plate 1.
When the flap 12 is closed by driving the seal 6, the seal plate 14 attached to the support plate 16 contacts the seal surface 5 a of the opening to close the opening 5. The seal plate 14 is attached to the support plate 16 at a distance from the support plate 16 and movably substantially in parallel with the support plate 16, and is always urged in a direction away from the support plate 16 by a leaf spring 18 between the seal plate 14 and the support plate 16. Therefore, it is possible to follow relatively large thermal deformation of the opening by the deformation of the leaf spring 18, and the seal plate itself can be freely formed of a material having high heat resistance (for example, a metal plate).
It can be used satisfactorily in a high-temperature portion of 00 ° C. or more.

Therefore, even if the gap between the flap and the fixing portion (opening) changes, the gap between the two flaps changes due to the elastic force of the spring, so that the flap and the fixing portion are always kept in close contact with each other. Sealability is ensured. Further, by setting the urging force of the leaf spring 18 to be larger than the acting force necessary for sealing the sealing surface 5a of the opening 5, even if the opening is thermally deformed in the radial direction in a high-temperature portion, the sealing is performed while following this. Board 14
Can always be pressed against the sealing surface 5a with an acting force required for sealing.

It should be noted that the present invention is not limited to the above-described embodiment, but can be variously modified without departing from the gist of the present invention. For example, in the above-described embodiment, the case where the seal structure of the flow passage opening / closing device is applied to the combined cycle engine is mainly described, but the seal structure of other flow passage opening / closing devices used under the same conditions may be applied as it is. Can be.

[0024]

As described above, the flow passage opening / closing device and the seal structure of the present invention can be used in a high-temperature portion and can follow a large thermal deformation. The present invention has an excellent effect that the device can be sealed, and a high temperature part flow passage of an aircraft engine, which cannot be sealed by the conventional sealing structure, can be sealed.

[Brief description of the drawings]

FIG. 1 is a front view of a combined cycle engine using a flow passage opening / closing device according to the present invention.

FIG. 2 is a partial cross-sectional view taken along line AA of FIG.

FIG. 3 is an overall configuration diagram of a combined cycle engine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Core engine 2 Bypass duct 3 Ram combustor 4 Exhaust nozzle 5 Opening 5a Seal surface 10 Channel opening / closing device 12 Flap 14 Seal plate 15 Connecting rod 16 Support plate 16a Rotating shaft 18 Leaf spring 20 Opening / closing drive 22 Link 24 Ring 26 Actuator

Claims (2)

[Claims] 1. A flap for opening and closing an opening provided in a flow passage, wherein the flap is driven by an opening and closing drive device, and a seal plate that contacts the opening to seal the opening and seal the flow passage. The seal plate is attached to the support plate at a distance from the support plate and substantially parallel to the support plate so as to be freely movable, and further, always biases the seal plate in a direction away from the support plate. A leaf spring is sandwiched between the seal plate and the support plate, and the urging force of the leaf spring when the seal plate is in contact with the opening is smaller than the acting force required to seal the opening when the flow path is closed. 3. The seal structure according to claim 2, wherein: is also set to be large. 2. An air conditioner comprising: a plurality of flaps for opening and closing a plurality of openings arranged at intervals in a circumferential direction in a flow path; and an opening / closing drive device for driving the flaps. A seal plate that contacts and seals the opening to seal the flow path; and a support plate driven by an opening / closing drive device. The seal plate is spaced apart from the support plate and is substantially free to move with respect to the support plate. A plate spring is sandwiched between the seal plate and the support plate so as to always urge the seal plate away from the support plate, and the support plate is orthogonal to the axis of the flow path. The opening / closing drive device is mounted so as to be swingable about a rotation axis, and includes a plurality of links each having an inner end pivotally attached to a support plate of each flap, and a single link having an outer end pivotally attached thereto. The ring and the ring back and forth along the axis of the flow path When the seal plate is in contact with the opening, the biasing force of the leaf spring is greater than the acting force required to seal the opening when the flow path is closed. Channel opening and closing device.