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A strength check and flange technology, applied in the direction of strength characteristics, measuring devices, instruments, etc., to achieve the effect of solving inaccurate design
Active Publication Date: 2018-11-23
HARBIN ELECTRIC CO LTD
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[0004] The non-taper neck flange has its disadvantages. Because there is no transition of the taper neck, a structure with a sudden change in shape is formed at the intersection of the flange and the f
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specific Embodiment approach 1
[0030] Specific implementation mode one: combine figure 1 and figure 2 Describe this embodiment, a method for checking the strength of a flange without a taper neck in this embodiment, including the following steps:
[0031] Strength verification method for non-taper neck flanges without external loads:
[0032] According to the design method of the pressure vessel design standard GB150.3 flange, the thickness of the flange is initially estimated according to the calculation method of the integral flange, and then the strength of the dangerous section of the flange is checked according to the following steps.
[0033] Method for checking the strength of a-a section:
[0034] The aa section bears two-way stress, and the bending stress σ generated by the flange stud force W am and the shear stress τ due to the flange stud force W a
[0035] At this time, the bending stress of the a-a section has stress concentration due to the structural mutation, and its stress concentrat...
specific Embodiment approach 2
[0179] Specific embodiment two, combine figure 1 and figure 2 Describe this embodiment, this embodiment proposes a flange with external load (bending moment, torque, radial thrust, axial tension) without taper neck (see Figure 5 ) strength checking method
[0180] Explanation of the strength check and design method of the flange bearing external load:
[0181] 1. There are four types of external loads on the pipe flange: 1) Bending moment M; 2) Torque T; 3) Radial thrust V; 4) Axial force N.
[0182] 2. In the accompanying document Figure 5 For example, there are ±My, ±Mz for bending moment; ±Tx for torque; ±Vz, ±Vy for radial thrust; ±Nx for axial force.
[0183] 3. The above M and V external loads may have values in both directions. When both external load values are given, they can be combined for calculation, for example, Mx and My values are given. Then the composite M value is:
[0184] The thrust V is similar to this.
[0185] 4. Torque T and axial for...
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Abstract
A cone-free neck flange intensity checking method belongs to the bearing equipment flange intensity design technical field, and comprises the following steps: 1, determining usage conditions of a cone-free neck flange member, entering step 2 and using the method in step 2 to check the intensity if no external load is applied in the usage process, and entering step 3 and using the method in step 3to check the intensity if an external load is applied in the usage process; 2, a, using a whole flange calculating method to primarily estimate the flange thickness value according to a pressure vessel design standard specification flange design method; b, checking the a-a cross sectional intensity; c, checking the b-b cross sectional intensity; 3, the intensity checking method for the cone-free neck flange with the external load: a, checking the a-a cross sectional intensity; b, checking the b-b cross sectional intensity. The method can solve the confusions of design personnel designing the parts of this type, and can be practically applied to real design activities, thus effectively solving the problems that the cone-free neck flange structure characteristic constant is in accurate in design and further causing service failure of this type of flange in equipment.
Description
technical field [0001] The invention relates to a method for checking the strength of a flange without a taper neck, and belongs to the technical field of flange strength design for pressure-bearing equipment. Background technique [0002] Currently there is no tapered neck flange (instructions attached figure 1 ) strength check and design, the pressure vessel design standard (GB150) gives the overall flange with a tapered neck (instructions attached figure 2 ) design method, but no specific calculation examples are given. Due to structural reasons, the height of the taper neck cannot be determined when calculating with the integral flange formula, which leads to inaccurate structural characteristic values. At present, there is no clear calculation example when designing such components, and there is a lack of standards and calculation example support. Because of this, this patent solves the strength check and design method of such non-taper neck flanges, which can be app...
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