CN104691738A - Cabin door with variable slope edge - Google Patents

Abstract

The invention provides a cabin door with a variable-slope edge. The section line of the edge surface matching the hatch door and the door body is an arc or a broken line with a variable slope. The present invention can effectively solve the interference problem in the opening process of the inner connection and outer opening type large-wall thickness hatch by adopting the design scheme of the section line with variable slope on the edge of the hatch.

Description

hatch with sloped edge

technical field

The invention belongs to the field of aerospace equipment, in particular to a cabin door suitable for a variable-slope edge of an aircraft with a large wall thickness.

Background technique

The landing gear and the payload hatch of general aerospace vehicles all adopt the opening scheme of the inner connection and outer opening hatch of the hinge arm effect. This kind of hatch has the advantages of good controllability, short response time, simple force transmission path, and high reliability. Most of the active aerospace and aviation aircraft adopt this kind of interior connection and exterior opening hatch scheme.

For aerospace vehicles, when they fly in the atmosphere at a high speed, a large heat flow will be generated on the surface, and at the same time, there will be a large pressure difference between the inside and outside of the vehicle, which poses a severe challenge to the sealing of the vehicle door. Due to the heat protection requirements of the aircraft re-entry into the atmosphere, the door of the aerospace vehicle generally has a relatively thick wall, and if the door with a large wall thickness adopts a straight edge, there will be interference problems that are difficult to open during the opening process. In order to solve the problem of door opening interference, the edge of the door is generally made into a sloped form. However, if the slope of the hatch door is too small, it will easily cause problems such as difficulty in processing and assembly. In addition, because the hatch door is a slope, it is difficult to seal the hatch door with high reliability by adding sealing strips between the hatch slits in the traditional way.

Contents of the invention

The invention aims to solve the problem of the interference problem of difficult opening of the hatch and the problem of low sealing reliability existing in the hatch of the existing space vehicle.

Technical scheme of the present invention is:

A hatch door with a variable-slope edge, wherein the section line of the edge surface matching the hatch door and the door body is an arc or a fold line with a variable slope.

The section line is a fold line with variable slope, and a groove is arranged on the section line of the door body, and a sealing ring is arranged in the groove.

Grooves are provided at the knuckles of the section lines.

The outer contour of the sealing ring in the groove is tangent to the extension line of the section line at the knuckle.

A section line is a polyline composed of two line segments.

A section line is a polyline composed of at least three line segments.

The advantage of the present invention compared with prior art is:

(1) The present invention can effectively solve the interference problem in the opening process of the internal connection and external opening type large-wall thickness hatch by adopting the design scheme of the section line with variable slope on the edge of the hatch.

(2) The present invention uses the pre-embedded elastic sealing ring to realize the self-sealing of the hatch by utilizing the extrusion force of the hatch closing, and forms a knuckle-type sealing path through the section of the hatch with a variable slope to form double insurance of the hatch seal, and completes the high reliability of the hatch Self-sealing solution.

Description of drawings

Fig. 1 is the schematic diagram of the cabin door of variable slope edge of the present invention;

Fig. 2 is a schematic cross-sectional view of a hatch with a variable slope edge of the present invention;

Fig. 3 is the opening schematic diagram of the cabin door of the variable slope edge of the present invention;

Fig. 4 is the assembly schematic diagram of the sealing ring of the cabin door of variable slope edge of the present invention;

Fig. 5 is a schematic diagram of the self-sealing principle of the hatch with variable slope edge in the present invention.

Detailed ways

From the above introduction, it can be known that the key to the hatch solution of the present invention is the design of the variable-slope section of the hatch and the setting of the sealing ring. The specific implementation of the present invention will be further described in detail below in conjunction with the accompanying drawings.

As shown in Fig. 1 and Fig. 2, the schematic diagram of the variable-slope section line of the internally connected and outwardly opening hatch door of the present invention, the dotted line and the shaded part in the figure are the hatch 20, the non-shaded part is the aircraft body 10, and the O point is the hatch The center of rotation of the rotating shaft 30 can only be installed close to the door because the installation position of the rotating shaft is limited by the equipment in the cabin and the design of the hatch, so that the interference of the hatch is more serious. The broken line ADC in the figure is the section line 21 with variable slope of the edge of the cabin door of the present invention.

Referring to Fig. 2, if the edge section of the cabin door is a straight line AE, it can be seen from point A in the figure that the trajectory line 32 is opened, the trajectory line intersects the aircraft body 10 at point B, and point B is located in the body within the straight line AE, that is, the cabin When the door 20 is opened, the AE side will interfere with the aircraft body 10 .

Draw the vertical line OD of AB through the point O of the hinge of the cabin door. Here, the principle that the straight side of a right triangle is smaller than the hypotenuse is used. At this time, the length of the line connecting the points from A to D on AD and point O gradually decreases, and each point on AD None of the AD trajectory lines 31 rotating around O will intersect with the aircraft body 10 , that is, no interference will occur when the matching section line AD of the hatch 20 is opened.

Similarly, find a point C on the edge of the aircraft body so that the length of OC is less than the line connecting other points on CD and point O. At this time, similar to the aforementioned case of AD, OD becomes the hypotenuse of the right triangle, and OC becomes the straight side. In the same way, since OC is smaller than OD, each point on CD will not interfere with the body when it is opened around O. So far, the variable slope slope of the hatch is determined, which avoids the problem of hatch opening interference.

The above shows the situation that the section line 21 of the edge surface where the hatch door cooperates with the door body is a broken line composed of two line segments. Furthermore, the section line on the edge of the door can also be composed of three or more line segments to accommodate thicker bulkheads or some special needs, just as the above-mentioned interference avoidance of the two line segments ensures that multiple line segments are in beyond the interference line. Preferably, as an extreme case of the broken line, it can also be made into a matching arc surface line. After ensuring the position of the center of the arc of the door body relative to the center of the rotating shaft so that the rotation arc of the door body will not intersect with the body, it can also be guaranteed The hatch doesn't interfere.

Referring to the schematic diagram of hatch opening shown in Figure 3, it can be seen from the opening trajectory of the edge of the hatch that on the side close to the hinge of the hatch, the opening trajectory of the internally connected and outwardly opening hatches with variable slope knuckles does not intersect the aircraft body. ; On the side away from the hatch shaft, its opening trajectory line does not intersect with the body either.

Referring to the schematic diagram of sealing ring assembly shown in Figure 4, a groove 11 slightly smaller than the size of the sealing ring 40 is set at the knuckle of the folding line of the aircraft body. The extension line at the knuckle is tangent, so that the sealing ring 40 will not protrude from the edge of the knuckle, and the sealing ring 40 can be placed in the groove where it is impossible to interfere, which can avoid the interference problem when the hatch is opened, and prevent it from being blocked by the door when opening and closing the hatch. Body knocked off.

See Figure 5 for a schematic diagram of the principle of highly reliable self-sealing of the hatch. When the door is closed, the inclined surface of the door and the inclined surface of the body will generate an upward extrusion force (the arrow shows the moving direction of the door), and the self-sealing will be realized through the extrusion of the elastic sealing ring; at the same time, the section of the door with variable slope The sealing path formed with knuckles provides double insurance of the hatch door sealing and realizes the highly reliable self-sealing of the hatch door.

Claims (6)

1. the hatch door at variable slope edge, is characterized in that, the broken line that the section line (21) of the edge surface that hatch door coordinates with door body is camber line or variable slope.

2. the hatch door at variable slope edge according to claim 1, it is characterized in that, the broken line that described section line (21) is variable slope, the described section line (21) of described door body arranges groove (11), seal ring (40) is housed in described groove (11).

3. the hatch door at variable slope edge according to claim 2, is characterized in that, described groove (11) is arranged on the knuckle place of described section line (21).

4. the hatch door at variable slope edge according to claim 3, is characterized in that, the outline of described seal ring (40) in described groove (11) and described section line (21) tangent at the extended line at knuckle place.

5. the hatch door at variable slope edge according to claim 1, is characterized in that, described section line (21) is the broken line be made up of two sections of line segments.

6. the hatch door at variable slope edge according to claim 1, is characterized in that, described section line (21) is the broken line be made up of at least three sections of line segments.