CN115234551A

CN115234551A - Be applied to mortise-tenon joint structure of low-speed wind tunnel model

Info

Publication number: CN115234551A
Application number: CN202210661488.7A
Authority: CN
Inventors: 申玉鑫; 王铭威; 刘淑丽; 魏立辉; 徐越
Original assignee: AVIC Aerodynamics Research Institute
Current assignee: AVIC Aerodynamics Research Institute
Priority date: 2022-06-13
Filing date: 2022-06-13
Publication date: 2022-10-25

Abstract

The invention relates to a mortise-tenon joint applied to a low-speed wind tunnel model, belonging to the technical field of wind tunnel tests, comprising a connected piece and a model main body, wherein a mounting seat on the connected piece is of a dovetail tenon structure, a dovetail mortise structure is arranged at a relative mounting position on the model main body to be matched with the model main body, and the degree of freedom of the connected piece in the vertical direction of a matching surface is limited, the contact surface of the dovetail tenon on the mounting seat on the connected piece and the dovetail mortise on the model main body is a mortise-tenon matching surface, the structural form can greatly reduce the use quantity of screws at the joint of the part while improving the disassembly and assembly efficiency of the part, compared with the traditional connection form for disassembling threaded fasteners, the dovetail mortise-tenon joint structure can furthest ensure the surface quality around the part on the model, and has important significance for improving the precision of wind tunnel test data. The method has the advantages of improving the surface quality of the low-speed wind tunnel model, and improving the precision of test data and the replacement efficiency of parts.

Description

Be applied to mortise-tenon joint structure of low-speed wind tunnel model

Technical Field

The invention belongs to the technical field of wind tunnel test research, and particularly relates to a mortise and tenon joint structure applied to a low-speed wind tunnel model.

Background

At present, the low-speed wind tunnel test model in the industry is generally designed by adopting a large number of traditional threaded fasteners to realize the connection of all parts on the model, a plurality of screw hole structures are usually arranged around all the part mounting seats for connecting screws, and when the model state is changed in the test, operators need to detach the screws one by one to realize the change of the parts. On one hand, the surface quality of the low-speed wind tunnel test model is influenced by more screw hole structures on the surface of the low-speed wind tunnel model, and particularly the aerodynamic characteristics around aerodynamic sensitive parts (such as a tail wing) on the model are influenced greatly, so that the surface quality of the low-speed wind tunnel test model is an important factor influencing wind tunnel test data; on the other hand, the repeated disassembly of a plurality of screws around a part on the model in the test process also affects the working efficiency of operators.

Disclosure of Invention

Based on the defects, the invention aims to provide the mortise and tenon joint structure applied to the low-speed wind tunnel model, which can improve the surface quality of the low-speed wind tunnel model and improve the precision of test data and the replacement efficiency of parts.

In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a mortise and tenon joint structure who adopts in low-speed wind tunnel model design, includes by connecting piece and model main part, by the mount pad on the connecting piece for the forked tail tenon structure, relative mounted position sets up to the forked tail mortise structure rather than cooperateing in the model main part, the restriction by the degree of freedom of connecting piece in the fitting surface vertical direction, the contact surface of the forked tail tenon on the mount pad by the connecting piece and the forked tail mortise in the model main part be the mortise and tenon fitting surface.

Further, by the mounting position on connecting piece and the model main part be two sets of, be bilateral symmetry and distribute to arrange along the cooperation direction at a certain distance, by the dovetail structure on the mount pad on the connecting piece and the quantity of the dovetail groove in the model main part be not less than two sets of.

Furthermore, the dovetail tenon structure on the mounting seat on the connected piece is in clearance fit with the dovetail groove on the model main body.

Furthermore, the section of the dovetail tenon is triangular or trapezoidal.

The positioning component is positioned in the front and back positions of the connected piece and used for limiting the degree of freedom of the connected piece along the mortise and tenon joint surface direction.

The invention has the advantages that: this structural style is when improving part dismouting efficiency, and the use quantity of this part junction screw of greatly reduced compares with the connection form of traditional dismantlement threaded fastener, and this forked tail mortise type connection structure can guarantee the surface quality around this part on the model to the at utmost, has important meaning to improving wind-tunnel test data precision. Test verification shows that the design form of mortise and tenon connection on the low-speed wind tunnel model can greatly reduce the use amount of screws, the replacement efficiency of the part is improved, meanwhile, the surface quality around the part can be obviously improved, and the precision of test data is improved.

Drawings

FIG. 1 is a general schematic view of a dovetail mortise-tenon joint structure of the present invention;

FIG. 2 is a schematic view of the structure of the joint of the model main body;

FIG. 3 is a schematic view of the joint of the connected members;

FIG. 4 is a schematic view of the back ready installation of the connected elements on the mortises of the mold body;

FIG. 5 is a schematic view of the configuration of the connected member ready for installation behind the mortise of the mold body;

FIG. 6 is a schematic view of the structure of the connecting piece and the mortise of the model main body.

Wherein, 1, control plane, 2, fin, 3, back fuselage, 4, mortise-tenon joint position, 5, non-fitting surface, 6, model main part fitting surface, 7, tongue-and-groove, 8, by the connecting piece fitting surface, 9, tenon, 10, by the connecting piece, 11, model main part, 12, prepare to carry out the complex dovetail, 13, prepare to carry out the complex dovetail.

Detailed Description

The following provides a detailed description of the embodiments with reference to the drawings, and further describes the technical solutions of the present invention through the description of the embodiments.

Example 1

As shown in fig. 1-3, a mortise and tenon joint structure adopted in low-speed wind tunnel model design comprises a connected piece and a model main body, wherein a mounting seat on the connected piece is a dovetail tenon structure, a relative mounting position on the model main body is set to be a dovetail mortise structure to be matched with the dovetail mortise structure, the cross section of the dovetail tenon is triangular or trapezoidal, the degree of freedom of the connected piece in the vertical direction of a matching surface is limited, and the contact surface of the dovetail tenon on the mounting seat on the connected piece and the dovetail mortise on the model main body is a mortise and tenon matching surface. The size and the number of the tenon-and-mortise matching surfaces are generally determined according to the connection strength which must be met by the connecting piece, the more the matching surfaces are designed, the higher the connection strength is, and the greater the processing difficulty is. The non-matching surface is generally a separating surface between the connected piece and the model main body, a large gap is designed at the position, the phenomenon that the disassembly and assembly are influenced due to the fact that the dovetail tenon and the mortise are matched in a locating mode is avoided, and meanwhile the smooth implementation of the machining process can be guaranteed. The installation position by on connecting piece and the model main part be two sets of, be bilateral symmetry and distribute to arrange along the cooperation direction certain distance of interval, by the dovetail structure on the mount pad on the connecting piece and the quantity of the dovetail groove in the model main part be two sets of. The dovetail structure on the mounting seat on the connected piece and the dovetail groove on the model main body are in clearance fit, and the high efficiency and the reasonability of disassembly and assembly are guaranteed by giving fit tolerance. The embodiment also comprises a positioning component, wherein the positioning component is positioned at the front and back positions of the connected piece and used for limiting the degree of freedom of the connected piece along the tenon-and-mortise matching surface direction.

Example 2

For the dovetail mortise-tenon type connecting structure provided by the invention, the connected piece is arranged in the model main body in advance, the installation and use process of the connected piece mainly comprises the following steps, and the disassembly process is referred to in reverse order:

the method comprises the following steps: placing the connected piece on the mortise of the model main body at the rear part for installation, as shown in figure 4;

step two: the connected piece is dropped and placed behind the mortise of the model main body to be installed, as shown in fig. 5;

step three: the connected piece is pushed along the mortise and tenon matching surface direction until the dovetail tenon of the connected piece is completely matched with the mortise of the model main body, as shown in fig. 6.

Claims

1. The utility model provides a mortise-tenon joint structure who adopts in low-speed wind tunnel model design, includes by connecting piece and model main part, its characterized in that: the dovetail tenon structure is set as by the mount pad on the connecting piece, relative mounted position sets up to the dovetail mortise structure rather than cooperateing in the model main part, the restriction by the degree of freedom of connecting piece in fitting surface vertical direction, by the contact surface of the dovetail tenon on the mount pad on the connecting piece and the dovetail mortise in the model main part be the tenon fourth of the twelve earthly branches fitting surface.

2. The mortise-tenon joint structure adopted in low-speed wind tunnel model design according to claim 1, wherein: the installation position by on connecting piece and the model main part be two sets of, be bilateral symmetry and distribute to arrange along the cooperation direction certain distance of interval, by the dovetail structure on the mount pad on the connecting piece and the number of the dovetail groove in the model main part be not less than two sets ofly.

3. The mortise and tenon joint structure adopted in the design of the low-speed wind tunnel model according to claim 1 or 2, wherein: the dovetail tenon structure on the mounting seat on the connected piece is in clearance fit with the dovetail groove on the model main body.

4. The mortise and tenon joint structure adopted in the design of the low-speed wind tunnel model according to claim 3, wherein: the section of the dovetail tenon is triangular or trapezoidal.

5. The mortise and tenon joint structure adopted in the design of the low-speed wind tunnel model according to claim 4, wherein: the positioning parts are positioned in front and back positions of the connected piece and used for limiting the degree of freedom of the connected piece along the tenon-and-mortise matching surface direction.