This standard applies to ordinary rectangular waveguide flanges, which are part of a complete set of waveguide flanges and should be used in conjunction with GB 11449.1 "Waveguide flanges Part 1: General requirements". GB 11449.2-1989 Waveguide flanges Part 2: Ordinary rectangular waveguide flanges specification GB11449.2-1989 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Waveguide flanges
Part 2: Relevant specification for flangesfor ordinary rectangular waveguidesGB11449.2-89
This standard applies to ordinary rectangular waveguide flanges, which is part of a complete set of waveguide flanges and should be used in conjunction with GB11449.1 "Waveguide flanges Part 1: General requirements". 1 General
1.1 Flange Types
The common rectangular waveguide flange types included in this standard are listed in Tables 1 to 8 and Figures 1 to 26. 1.2 Flange Model Nomenclature
The flange model is composed as follows:
The first letter "F" indicates the waveguide flange; the second letter indicates the type of flange, and flanges with the same letter and the same waveguide size can be matched: b.
The third letter indicates the structural characteristics of the flange: c.
M-The flange has a sealing groove but no choke groove;
E-The flange has a sealing groove and a flow groove;
P-The flange has no sealing groove and a flow groove.
d. The number indicates the waveguide code that matches the flange. Example of marking:
Flange FDP120GB11449;
indicates a D-type flange without a sealing groove, and the matching rectangular waveguide is BJ1202 Mechanical requirements
2.1 Dimensions
2.1.1 Positioning holes
The positioning holes should be clearly indicated in the drawings and require precision drilling. The positioning holes should be as close to the narrow side of the waveguide as possible. The connection holes can use a lower position accuracy than the positioning holes, but the hole diameter should be appropriately enlarged to ensure the connection of the flange. 2.1.2 Positioning bolts and screw diameters
The basic values ​​of the screw diameter and their deviations are listed in Tables 1 to 8. 2.1.3 Relationship between the screw and the positioning hole diameter To ensure the connection of the two flanges, each single flange should specify: a. The position of the hole, the basic size of the hole diameter and its deviation; b. The basic size of the connection bolt screw diameter with appropriate matching. Approved by the Ministry of Electronics Industry of the People's Republic of China on March 4, 1989 and implemented on March 1, 1990
The tolerances of the positioning holes are given in the following table: Flange type
Rectangular flange matching BJ waveguide
Circular flange matching BJ waveguide
GB11449.289
Waveguide size range
BJ12 and larger sizes
BJ14~BJ32
BJ40~BJ70
BJ84 and smaller sizes
National Ministry
Note: When it is required electrically, the hole position tolerance value can be reduced, but the hole matching tolerance should be changed accordingly. The actual values ​​are shown in the corresponding figures and tables.
2.1.4 Flange dimensions and thickness
Matching types
The flange dimensions and thickness are listed in Tables 1 to 8. The values ​​given are for brass. If other materials are used, other more appropriate values ​​should be used.
2.1.5 Surface roughness of flange contact surface The surface roughness R of flange contact surface should not be greater than 1.6um. 2.1.6 Flatness of flange contact surface
Flange contact surface flatness shall not be greater than the given values ​​in the following table: Waveguide size range
BJ12 and larger sizes
BJ14~BJ26
BJ32~BJ180
BJ220 and larger sizes
2.1.7 Perpendicularity of hole axis
The perpendicularity of the hole axis relative to the flange contact surface is 90°±1/4°2.2 General requirements for assembled flanges
2.2.1 Positioning of holes
The positioning of holes shall be based on the theoretical symmetry line of the waveguide inner cross section. 2.2.2 Perpendicularity of contact surface
The perpendicularity of the flange contact surface relative to the waveguide axis shall be 90°±1/4°. 2.3 Additional requirements for unassembled flanges 2.3.1 Assembly type
Requirements
The figures in this standard show assembled flanges, which are given as examples of one or several assembly forms for flange waveguide installation, but this does not exclude other assembly types. Socket installation should be used for flanges with flow grooves. 2.3.2 Diameter shape
The dimensions of the part of the flange that fits the waveguide should be the same as the basic external dimensions of the waveguide in GB11450.2 "Specifications for ordinary rectangular waveguides". The deviation of the diameter size depends on the materials used and the assembly method, so it should be determined by negotiation between the supply and demand parties according to needs. The basic dimensions and deviations of the front diameter of the socket flange should be in accordance with the basic dimensions and deviations of the internal section of the waveguide in GB11450.2 standard. 2.3.3 Positioning of holes
For pre-drilled flanges, the positioning of the holes should be based on the theoretical symmetry line of the flange diameter. 2.3.4 Ordering Notes
When ordering unmounted flanges, a certain amount of machining allowance should be left for certain dimensions that need to be machined after assembly. A-type flange
GB11449.2-89
FA.32~40
FAP32~40
FAP32~40
FAE32~40
4-From A (connection hole)
Figure 1~2
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4-Middle A (connection hole)
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Middle A (positioning hole)
A-type flange
GB11449.2-89
FA.58~70
FAP58~70
FAM58~70
2-White A (connection hole)
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4-middle A (positioning hole)
11449.2—89
880 thousand
10000+
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A type flange
GB11449.2-89
FA.400～900
FAP400900
FAM400~900
4-A (positioning hole)
China
Figure 7~8
200K
200K
200K
S00 dry
8860℃
S00 drywww.bzxz.net
S00 dry
s0'0 dry
500 dry
B type flange
GB 11449.2-89
FB.84~320
FBP84~320
FBM84~320
FBE84~320
4-bA (positioning hole)
Figure 9~10
18100-
500 stem
S00 stem
500 stem
s00 stem
500 stem
500 stem
200 thousand
20°0 thousand
80° 0k
800k
800k
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200k
200k
200k
20°0k
200k
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500k
090°0+
590s00
500dry
20°0k
20°0k
C-type flange
GB 11449.289
FCM.220~500
Figure 11~12
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