Air door actuating mechanism

Abstract

An air door actuating mechanism can drive an air door to move between an opening position and a closing position, and comprises an actuator which is provided with an actuator operating cylinder capable of stretching and retracting in the front-back direction and is installed in an air door frame in a mode of rotating relative to the air door frame; one end of the connecting rod is fixedly connected to the air door, and the other end of the connecting rod is connected to the actuator operating cylinder in a relative rotation mode; and a plurality of connection mechanisms, each of which has a link and a mounting base that are connected so as to be able to rotate relative to each other, the damper is connected to the damper frame via the plurality of connection mechanisms, a maintenance compartment is formed in the damper frame, and the damper actuation mechanism is mounted in the maintenance compartment. And the air door actuating mechanism is not positioned in the air inlet pipeline. The air door actuating mechanism does not need to penetrate through a cabin when being installed, does not enter a flowing channel of air flow when being opened, is simple in structure and does not affect air inlet performance.

Description

Technical Field

[0001] The utility model relates to a damper actuating mechanism, in particular to a damper actuating mechanism which is integrated and installed near a damper of an aircraft, and belongs to the design field of an air intake system in an auxiliary power device of the aircraft. Background Art

[0002] The auxiliary power unit (APU) of a civil aircraft is an important component of the aircraft. It is used to start the main engine on the ground, or to provide the generator shaft power to the aircraft's power system when controlling flight, and to provide auxiliary functions such as bleed air to the air source system.

[0003] The auxiliary power unit introduces air from the outside into the compressor through the air intake system, thereby providing the air flow required for the auxiliary power unit to work under various operating conditions. Therefore, the design of the air intake system plays a very critical role in ensuring the aerodynamic performance of the auxiliary power unit on the ground and in the air.

[0004] At present, mainstream models generally use linear damper actuators to drive ram-type intake dampers to improve intake efficiency. At this time, the damper actuator is often installed in the APU cabin, needs to pass through the APU cabin and be hinged with the intake damper to drive the damper to open or close.

[0005] Figure 1A A typical APU air intake damper actuation system is shown, in which the damper actuator 1a is a linear telescopic actuator installed in the firewall, and the actuator needs to pass through the air intake duct 1b to connect with the damper 1c so as to drive the damper 1c to open and close.

[0006] In this structure, on the one hand, the actuating rod 111a of the damper actuator 1a is located right in the middle of the flow channel for the external air to enter and exit, which greatly affects the APU air intake performance and reduces the air intake efficiency. In addition, under low temperature and other icing-prone climatic conditions, the actuating rod in the center of the flow channel is prone to freeze and become an attachment of ice crystals. Under the disturbance of the air, the ice is easy to break and collide with other components. In severe cases, even dangerous conditions such as APU surge may occur, thereby affecting the stable operation of the system.

[0007] On the other hand, since the damper actuator 1a is installed in the firewall and the actuator rod 111a passes through the air intake duct 1b, in order to perform fire protection, it is necessary to use a metal fireproof cover 1d to completely wrap the damper actuator 1a at the position where the cabin is penetrated. This requires the additional installation of a metal fireproof cover 1d, which increases the cost of the unit, increases the weight of the system, and increases the difficulty of installation.

[0008] In response to the above problems, Figure 1B Another air intake damper actuator proposed in a certain patent is shown, in which the damper actuator 2a is installed at the rear of the air intake duct 2b, the actuator is wrapped by a stainless steel fireproof cover, and the actuator is connected to the air intake damper through a "Y"-shaped connecting rod component, thereby controlling the opening and closing of the damper 2c.

[0009] Although the technical solution proposed in this patent can solve the problem of the air intake performance being affected by the actuator rod of the actuator lying across the air flow channel, the metal fireproof cover 2d is also wrapped around the outside of the actuator as a whole, which will greatly increase the weight and increase the difficulty of installation and maintenance.

[0010] In addition, in this mechanism, the connection position between the actuator and the damper 2c is usually kept fixed, and the opening and closing of the damper 2c is achieved by rotating the actuator. Therefore, not only does the opening of the actuator that penetrates the cabin need to be fire-sealed, but the rotation of the actuator will also increase the difficulty of fire-sealing, and often requires the use of flexible seals or complex fire-sealing structures.

[0011] However, if flexible seals are used, fire tests are usually required to demonstrate their fire resistance, which results in high development costs and a long development cycle. If complex metal connection structures are used to ensure fire resistance, the structure becomes more complex and special through-tank connectors need to be manufactured, which is more expensive and more difficult to install and maintain.

[0012] Therefore, how to provide a damper actuating mechanism with a simple structure and without affecting the air intake performance becomes a technical problem that needs to be solved urgently. Utility Model Content

[0013] The present disclosure is made to solve the above-mentioned technical problems, and its purpose is to provide a damper actuating mechanism, which does not need to pass through the cabin and will not enter the flow channel of the airflow when opened. It has a simple structure and will not affect the air intake performance.

[0014] In order to achieve the purpose of the present disclosure, a damper actuating mechanism is provided, wherein the damper actuating mechanism can drive the damper to move between an open position and a closed position, wherein the damper actuating mechanism comprises: an actuator, the actuator having an actuator operating cylinder that can be extended and retracted in a front-to-rear direction, and is installed in the damper frame in a manner that can rotate relative to the damper frame; a connecting rod, one end of the connecting rod is fixedly connected to the damper, and the other end is connected to the actuator operating cylinder in a manner that can rotate relatively; and a plurality of connecting mechanisms, the plurality of connecting mechanisms respectively have a connecting rod and a mounting support that are connected in a manner that can rotate relatively, and the damper is connected to the damper frame via the plurality of connecting mechanisms, a maintenance compartment is formed in a portion of the damper frame that does not overlap with the intake duct, the damper actuating mechanism is installed in the maintenance compartment, and the damper actuating mechanism is not in the intake duct when the damper is in the open position.

[0015] According to the structure as described above, by forming a maintenance cabin in the damper frame and installing the damper actuating mechanism in the maintenance cabin, the damper actuating mechanism of the utility model does not need to pass through the cabin during installation, thereby there is no need to install a heavy fire protection mechanism, which can significantly reduce the overall weight of the mechanism, and during movement, the damper actuating mechanism will not pass through the flow channel of the airflow, thereby not affecting the air intake performance.

[0016] Preferably, the damper actuating mechanism is connected to the damper via a connecting rod at a middle position of the damper.

[0017] Preferably, the plurality of connection mechanisms are an even number and are arranged symmetrically on both sides of the damper actuating mechanism.

[0018] According to the above-described configuration, the load acting when the damper needs to be moved can be evenly distributed through the connection mechanisms arranged symmetrically to each other, which can significantly improve the system efficiency and extend the service life of the mechanism.

[0019] Preferably, in the plurality of connection mechanisms, a large-area mounting surface is formed at one end of the connecting rod and the mounting bracket, respectively.

[0020] According to the above configuration, the areas of the mounting surface of the connecting rod and the mounting surface of the mounting bracket are formed larger so that the contact area can be increased during fixing, thereby improving the connection strength.

[0021] Preferably, when the actuator operating cylinder is extended forward, the damper is driven to move to the closed position via the multiple connecting mechanisms, and when the actuator operating cylinder is retracted backward, the damper is driven to move to the open position via the multiple connecting mechanisms.

[0022] According to the above-mentioned structure, the opening and closing of the damper can be realized by a simple structure, and the structure is simple, the operation is convenient, and the feasibility is strong.

[0023] Preferably, the actuator is fixed to the damper frame via an actuator bracket, and the actuator bracket is formed in a triangular shape, and an edge extending laterally is formed at the base of the triangle.

[0024] According to the above-mentioned structure, the edge of the above-mentioned actuator bracket is fixed to the surface of the above-mentioned damper frame by connecting methods such as welding or riveting. Through this edge, the contact area with the surface of the damper frame can be expanded, and by utilizing the stability of the triangular bracket, the installation strength of the above-mentioned actuator relative to the above-mentioned damper frame can be significantly improved.

[0025] Preferably, actuator bosses are formed on both sides of the actuator, respectively, and the actuator bosses are connected to the actuator bracket via bearings in a relatively rotatable manner.

[0026] Preferably, a guide wall smoothly connected to an outer wall forming the air intake duct is formed in the damper frame, and the guide wall is formed to be separated from an outer skin of the damper frame by a certain distance.

[0027] According to the above-mentioned structure, the guide wall can better guide the air from the outside into the intake duct when the damper is opened, and by forming the guide wall to be separated from the outer skin of the damper frame by a certain distance, interference with the connecting rod during the closing process of the damper can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] With reference to the above purposes, the technical features of the present invention are clearly described in the following technical scheme, and its advantages are obvious from the following detailed description with reference to the accompanying drawings, which show the preferred embodiments of the present invention by way of example without limiting the scope of the concept of the present invention.

[0029] Figure 1A is a schematic diagram showing the overall structure of a conventional APU intake air door actuation system. Figure 1B Schematic diagram showing the overall structure of another conventional APU air intake damper actuation system

[0030] Figure 2A It is a schematic diagram of the whole damper when the damper actuating mechanism of the utility model is in the closed position. Figure 2B It is an overall schematic diagram of the damper when the damper actuating mechanism of the utility model is in an open position.

[0031] Figure 3A It is a three-dimensional diagram of the damper actuating mechanism of the utility model in the open position and the closed position. Figure 3B It is a cross-sectional view of the damper actuating mechanism of the utility model when it is in an open position and a closed position.

[0032] Figure 4A This is a sectional view of the damper actuating mechanism of the utility model when viewed from the side. Figure 4B This is a sectional view of the damper actuating mechanism of the utility model when viewed from the front. Figure 4C Yes Figure 4B An enlarged cross-sectional view of the actuator bracket in FIG.

[0033] Figure 5A It is a three-dimensional diagram of the connecting rod of the damper actuating mechanism of the utility model. Figure 5B It is a three-dimensional diagram of the mounting support of the damper actuating mechanism of the utility model.

[0034] Explanation of symbols

[0035] 1a, 2a damper actuator;

[0036] 1b, 2b air intake duct;

[0037] 1c, 2c dampers;

[0038] 1d, 2d metal fireproof cover;

[0039] 111a Actuating rod;

[0040] 1. Damper actuating mechanism;

[0041] 11 Actuator;

[0042] 11a actuator bracket;

[0043] 11b Actuator operating cylinder;

[0044] 11c actuator boss;

[0045] 12 Connecting rod;

[0046] 13 Install the support;

[0047] 2 damper frame;

[0048] 21 Wind gate;

[0049] 22 outer skin;

[0050] 23 inner skin;

[0051] 24 guide wall;

[0052] 3. Air intake duct;

[0053] W Maintenance hatch. DETAILED DESCRIPTION

[0054] Various embodiments of the present invention will now be described in detail, examples of which are shown in the accompanying drawings. Although the present invention is described in conjunction with exemplary embodiments, it should be appreciated that this specification is not intended to limit the present invention to the exemplary embodiments described below. On the contrary, the present invention is intended to cover not only these exemplary embodiments, but also various alternative forms, modified forms, equivalent forms and other embodiments that may be included within the spirit and scope of the present invention as defined by the appended claims.

[0055] Below, refer to Figure 2A , the overall structure of the damper actuating mechanism 1 of the present invention is described. Figure 2A It is a schematic diagram showing the whole damper when the damper actuating mechanism 1 of the utility model is in the open position.

[0056] like Figure 2A As shown, the damper actuating mechanism 1 of the present invention as a whole mainly comprises an actuator 11 , a connecting rod 12 and a mounting support 13 . The damper actuating mechanism 1 as a whole is mounted in a maintenance compartment W formed in a damper frame 2 .

[0057] By installing the damper actuator 1 in the cavity structure of the maintenance cabin W, there is no need to open the APU cabin door during disassembly or maintenance, which facilitates the installation and maintenance of the damper actuator 1.

[0058] The damper frame 2 mainly includes a damper 21, an outer skin 22 and an inner skin 23. The damper frame 2 is formed to have a certain thickness, and an opening matching the shape of the damper 21 is provided at a position of the damper frame 2 connected to the air intake duct 3. Through the opening, air from the outside is guided into the air intake duct 3, thereby being supplied to various auxiliary power units of the aircraft.

[0059] In addition, a maintenance compartment W is opened at a position of the damper frame 2 located behind the air intake duct 3, the damper actuating mechanism 1 is installed in the maintenance compartment W, and the actuator 11 of the damper actuating mechanism 1 is connected to the damper 21 through a connecting rod 12 so as to drive the damper 21 to move between a closed position and an open position.

[0060] like Figure 2A As shown, the outer skin of the outer surface of the damper frame 2 is called an outer skin 22 , and the outer skin of the bottom surface of the maintenance compartment W of the damper frame 2 is called an inner skin 23 .

[0061] When the damper 21 is in the closed position, the damper 21 is flush with the outer skin 22 of the damper frame 2 and the maintenance compartment W, thereby completely closing the opening of the damper frame 2 connected to the air intake duct 3, thereby preventing external air from entering the air intake duct 3.

[0062] like Figure 2B As shown, when the damper 21 needs to be opened, the damper actuating mechanism 1 drives the damper 21 to move to the open position, and air from the outside enters the air intake duct 3 through the opening and is supplied to various components of the auxiliary power unit.

[0063] As described above, the damper actuator 1 of the utility model is installed in the maintenance compartment W formed in the damper frame 2, the position of the maintenance compartment W does not overlap with the flow path of the external air, and the damper actuator 1 as a whole will not enter the flow path during movement, thereby significantly improving the air intake performance.

[0064] Therefore, compared with the conventional damper actuators, the damper actuator mechanism 1 of the present invention does not need to pass through the firewall of the APU cabin, thus avoiding the complicated fire prevention problem of cabin penetration.

[0065] In addition, since the damper actuator 1 of the utility model is located in a non-fire zone, there is no need to use a heavy fireproof cover for the damper actuator 1, which can significantly reduce the overall weight of the APU air intake damper actuator system and reduce the production cost.

[0066] Below, refer to Figure 3A and Figure 3B , the movement mode of the damper actuating mechanism 1 of the utility model and the connection relationship with the damper 21 are described in detail.

[0067] Figure 3A It is a three-dimensional diagram of the damper actuating mechanism 1 of the utility model in the open position and the closed position. Figure 3B It is a cross-sectional view of the damper actuating mechanism 1 of the utility model in the open position and the closed position.

[0068] like Figure 3A As shown, the damper 21 is formed into a substantially rectangular shape, and a mounting portion 21a extending downward is formed at the rear end of the damper 21. The mounting portion 21a is connected to the damper frame 2 via two pairs of connecting mechanisms, and is connected to the actuator 11 of the damper actuating mechanism 1 via a connecting rod 12.

[0069] The two pairs of connecting mechanisms respectively include a connecting rod 12 and a mounting bracket 13, one end of the connecting rod 12 is fixedly connected to the mounting portion 21a, and the other end is connected to one end of the mounting bracket 13 in a relatively rotatable manner, and the other end of the mounting bracket 13 is fixedly connected to the damper frame 2, so that the damper 21 can move back and forth between an open position and a closed position relative to the damper frame 2 under the drive of an external force.

[0070] The actuator 11 includes an actuator bracket 11a, an actuator operating cylinder 11b and an actuator boss 11c. The actuator bracket 11a is arranged on the left and right sides of the actuator 11, and the actuator 11 is fixed to the damper frame 2 via the actuator boss 11c. The actuator operating cylinder 11b is arranged in front of the actuator and can perform telescopic movement in the front-rear direction.

[0071] like Figure 3A As shown, the actuator bracket 11 a is formed in a substantially triangular shape, and an edge slightly extending to the side is formed at the base of the triangle.

[0072] The edge of the actuator bracket 11a is fixed to the surface of the damper frame 2 by welding, riveting or other connection methods. Through this edge, the contact area with the surface of the damper frame 2 can be expanded, and by utilizing the stability of the triangular bracket, the installation strength of the actuator 11 relative to the damper frame 2 can be significantly improved.

[0073] The front end of the actuator operating cylinder 11 b is connected to one end of a connecting rod 12 in a relatively rotatable manner, and is further connected to a substantially central position of the mounting portion 21 a of the damper 21 via the connecting rod 12 .

[0074] When the actuator operating cylinder 11b extends forward, the damper 21 is driven to move to the closed position via the two pairs of connection mechanisms. When the actuator operating cylinder 11b retracts backward, the damper 21 is driven to move to the open position via the two pairs of connection mechanisms.

[0075] In addition, if Figure 2A As shown, grooves are formed at positions of the damper frame 2 corresponding to the three connecting rods 12 , which can prevent the three connecting rods 12 from interfering with the damper frame 2 and affecting the opening and closing of the damper 21 during the opening and closing process of the damper 21 .

[0076] In addition, if Figure 3A As shown, the two pairs of connection mechanisms are symmetrically arranged on both sides of the mounting portion 21 a relative to the actuator operating cylinder 11 b.

[0077] By configuring in this way, the load acting when the damper 21 needs to be moved can be evenly distributed through the two pairs of connection mechanisms, which can significantly improve the system efficiency and extend the service life of the mechanism.

[0078] In addition, if Figure 3B As shown, the side cross-section of the damper 21 is formed into a substantially triangular shape, and in addition to a mounting portion 21 a extending downwardly formed at the rear end of the damper 21 , sealing portions 21 b extending downwardly are also formed at the left and right ends of the damper 21 .

[0079] By means of the mounting portion 21a formed at the rear end and the sealing portions 21b formed at the left and right ends, when the damper 21 is in a closed position, it can fit tightly with the damper frame 2, thereby significantly improving the sealing effect of the damper 21 when it is in a closed position and preventing external airflow from entering when it is in a closed state and causing adverse conditions in the device.

[0080] Below, refer to FIG. 4A to FIG. 4C , the installation method of the damper actuating mechanism 1 of the utility model relative to the damper frame 2 is described in detail.

[0081] Figure 4A FIG. 1 is a cross-sectional view of the damper actuating mechanism 1 of the utility model when viewed from the side. Figure 4A As shown, a guide wall 24 smoothly connected to the outer wall forming the intake duct 3 is formed in the damper frame 2. The guide wall 24 can better guide the air from the outside into the intake duct 3 when the damper 21 is opened.

[0082] like Figure 4A As shown, in the above-mentioned two pairs of connecting mechanisms, one end of the above-mentioned mounting bracket 13 is fixedly connected to the guide wall 24 located in the above-mentioned damper frame, and the other end is connected to one end of the above-mentioned connecting rod 12 in a relatively rotatable manner, and the other end of the above-mentioned connecting rod 12 is fixedly connected to the mounting portion 21a located behind the above-mentioned damper 21.

[0083] The front end of the actuator operating cylinder 11 b of the actuator is connected to one end of a connecting rod 12 in a relatively rotatable manner, and the other end of the connecting rod 12 is fixedly connected to the mounting portion 21 a located behind the damper 21 .

[0084] In addition, further reference Figure 3B It can be seen that when the actuator operating cylinder 11b is retracted rearward, the actuator drives the connecting rods 12 in the two pairs of connection mechanisms to rotate clockwise relative to the mounting bracket 13, thereby driving the damper 21 to rotate clockwise and move to the open position.

[0085] When the actuator operating cylinder 11b extends forward, the actuator drives the connecting rods 12 in the two pairs of connection mechanisms to rotate counterclockwise relative to the mounting bracket 13, thereby driving the damper 21 to rotate counterclockwise and move to the closed position.

[0086] like Figure 4A As shown, the length of the connecting rod 12 in the above-mentioned connecting mechanism and the installation position of the mounting bracket 13 are designed so that when the above-mentioned damper 21 is in the open position, the entirety of the above-mentioned damper actuating mechanism 1 is located in the maintenance compartment W in the above-mentioned damper frame and does not enter the air intake duct 3.

[0087] In addition, from Figure 3B It can be seen that when the damper 21 moves from the open position to the closed position, the connecting rod 12 will extend forward. Therefore, the guide wall 24 is formed to be separated from the outer skin 22 of the damper frame 2 by a certain distance to avoid interference with the connecting rod 12 during the closing process of the damper 21.

[0088] Figure 4B FIG. 1 is a cross-sectional view of the damper actuating mechanism 1 of the utility model when viewed from the front. Figure 4B As shown, actuator bosses 11 c are formed on both sides of the actuator 11 , respectively. The actuator bosses 11 c are connected to the actuator bracket 11 a via bearings so as to be rotatable relative to the actuator bracket 11 a .

[0089] One end of the actuator bracket 11 a is connected to the actuator boss 11 c via a bearing in a relatively rotatable manner, and the other end is fixedly connected to the inner skin 23 of the damper frame 2 by welding or riveting.

[0090] Figure 4C FIG. 1 is a cross-sectional view showing an enlarged portion of the connection between the actuator bracket 11a and the damper frame 2. Figure 4C As shown, an edge that fits the surface of the inner skin 23 of the damper frame 2 is formed at the connection portion of the actuator bracket 11a connected to the damper frame 2, and the edge is fixedly connected to the inner skin 23 by welding or riveting.

[0091] When the actuator operating cylinder 11b of the actuator 11 moves forward and backward to drive the damper 2 to move between the closed position and the open position, the actuator 11 as a whole also rotates relative to the actuator bracket 11a, that is, the damper frame 2 via the bearing.

[0092] Below, refer to Figure 5A and Figure 5B , the connecting rod 12 and the mounting support 13 in the connecting mechanism of the damper actuating mechanism 1 of the utility model are described in detail.

[0093] like Figure 5A As shown, the connecting rod 12 is formed as a slender rod, a mounting surface is formed at one end thereof which is at a certain angle to the length direction of the connecting rod 12 and is connected to the mounting portion 21a of the damper 21, and a circular hole is formed at the other end thereof and is connected to the mounting support 13 in a relatively rotatable manner.

[0094] like Figure 5B As shown, the mounting bracket 13 is formed into a roughly T-shape, with a mounting surface formed at one end thereof and connected to the guide wall 24 in the damper frame 2, and a receiving groove with a through hole formed at the other end thereof, and connected to the connecting rod 12 in a relatively rotatable manner.

[0095] The mounting surface of the connecting rod 12 and the mounting surface of the mounting bracket 13 are formed to be larger so as to expand the contact area and improve the connection strength when they are fixed by welding or the like.

[0096] During assembly, one end of the connecting rod 12 with a circular hole is inserted into the receiving groove of the mounting support 13, and the circular hole of the connecting rod 12 is aligned with the through hole of the mounting support 13, and bolts are inserted into the above-mentioned holes so that the connecting rod 12 can rotate relative to the mounting support 13.

[0097] Although the structure and working principle of the utility model are described above in combination with the preferred embodiments, ordinary technicians in the technical field should realize that the above examples are only for illustration and do not constitute a limitation of the utility model. The utility model can be modified and varied within the spirit of the claims, and these modifications and variations will fall within the protection scope of the utility model.

Claims

1. A damper actuating mechanism (1), the damper actuating mechanism (1) being capable of driving a damper (21) to move between an open position and a closed position, characterized in that: The damper actuating mechanism (1) comprises: An actuator (11), the actuator (11) having an actuator operating cylinder (11b) that can be extended and retracted in the front-rear direction, and installed in the damper frame (2) in a manner that allows rotation relative to the damper frame (2); a connecting rod (12), one end of which is fixedly connected to the damper (21), and the other end of which is connected to the actuator operating cylinder (11b) in a relatively rotatable manner; and A plurality of connection mechanisms, each of which has a connecting rod (12) and a mounting support (13) connected in a relatively rotatable manner, and the damper (21) is connected to the damper frame (2) via the plurality of connection mechanisms, A maintenance compartment (W) is formed in a portion of the damper frame (2) that does not overlap with the air intake duct (3), the damper actuating mechanism (1) is installed in the maintenance compartment (W), and the damper actuating mechanism (1) is not in the air intake duct (3) when the damper (21) is in the open position.

2. The damper actuating mechanism (1) according to claim 1, characterized in that: The damper actuating mechanism (1) is connected to the damper (21) via a connecting rod (12) at a middle position of the damper (21).

3. The damper actuating mechanism (1) according to claim 2, characterized in that: The plurality of connection mechanisms are an even number and are arranged symmetrically on both sides of the damper actuating mechanism (1).

4. The damper actuating mechanism (1) according to claim 3, characterized in that: In the plurality of connection mechanisms, large-area mounting surfaces are respectively formed at one end of the connecting rod (12) and the mounting support (13).

5. The damper actuating mechanism (1) according to claim 4, characterized in that: When the actuator operating cylinder (11b) extends forward, the damper (21) is driven to move to a closed position via the multiple connecting mechanisms; when the actuator operating cylinder (11b) retracts backward, the damper (21) is driven to move to an open position via the multiple connecting mechanisms.

6. The damper actuating mechanism (1) according to any one of claims 1 to 5, characterized in that: The actuator (11) is fixed to the damper frame (2) via an actuator bracket (11a). The actuator bracket (11a) is formed in a triangular shape, and an edge extending laterally is formed at the bottom of the triangle.

7. The damper actuating mechanism (1) according to claim 6, characterized in that: An actuator boss (11c) is formed on both sides of the actuator (11), and the actuator boss (11c) is connected to the actuator bracket (11a) via a bearing in a relatively rotatable manner.

8. The damper actuating mechanism (1) according to claim 7, characterized in that: A guide wall (24) smoothly connected to an outer wall forming the air intake duct (3) is formed in the damper frame (2), and the guide wall (24) is formed to be separated from the outer skin (22) of the damper frame (2) by a certain distance.

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