CN-116881992-B - Method for determining explosion suppression structure of explosion-proof shell

CN116881992BCN 116881992 BCN116881992 BCN 116881992BCN-116881992-B

Abstract

The invention relates to the field of explosion-proof shells, in particular to a method for determining an explosion-proof structure of an explosion-proof shell. According to the invention, an experimental study is carried out on the characteristic that the wire mesh is used as an explosion suppression material to suppress the explosion of the premixed gas in the explosion-proof shell by utilizing a self-built explosion experiment system, the influence of the mesh number and the layer number of the wire mesh on the explosion characteristic of the premixed gas in the explosion-proof shell is studied by utilizing a numerical simulation method, the change characteristic of the explosion pressure in the explosion process of the premixed gas in the explosion-proof shell after the wire mesh is placed is explored, the explosion suppression effect of the explosion-proof shell is quantitatively analyzed, so that the explosion characteristic parameters of the premixed gas in the explosion-proof shell are obviously reduced, the time for obtaining the maximum explosion pressure by the explosion of the premixed gas in the explosion-proof shell is prolonged, and the explosion suppression effect of the explosion-proof shell is better due to the design of the explosion suppression structure of the explosion-proof shell.

Inventors

LI DONG
DAI SHIJIE
QI CHAOQUN

Assignees

河北工业大学

Dates

Publication Date: 20260508
Application Date: 20230710

Claims (6)

1. A method for determining an explosion suppression structure of an explosion-proof shell is characterized by comprising the steps of, Step S1, researching an explosion suppression structure, and preliminarily determining the explosion suppression structure of the selected explosion suppression material and the explosion suppression shell; step S2, establishing a three-dimensional model for the explosion suppression structure of the explosion suppression shell in the step S1, performing explosion simulation, and primarily determining the number of layers and the number of the metal wire meshes; Step S3, experimental verification is carried out on the explosion suppression structures of the explosion suppression shells determined in the step S1 and the step S2, and the accuracy of the step S1 and the step S2 is determined; In step S1, the explosion suppression material is selected from a stainless steel wire mesh, the explosion suppression structure of the explosion suppression housing is an explosion suppression member formed by the stainless steel wire mesh, and the section size of the explosion suppression member is set to be the same as that of the explosion suppression housing; In the step S2, establishing an explosion-proof shell physical model in a proportion of 1:1 with a real object through software, dividing the established physical model by adopting polyhedral grids, and evaluating grid independence through repeated simulation of different grid numbers; when the explosion simulation is carried out on the physical model of the explosion-proof shell to determine the mesh number of the metal wires, the explosion simulation is carried out on the metal wires with different mesh numbers by fixing the layer number of the metal wires, the explosion pressure curve of the explosion-proof shell under different mesh numbers of the metal wires is compared and analyzed, and the explosion characteristic related parameters when the mesh numbers of the metal wires are different are obtained; When the explosion simulation is carried out on the explosion-proof shell physical model to determine the number of layers of the metal wire net, the explosion simulation is carried out on the metal wire net with different layers by fixing the optimal number of metal wire net, the explosion pressure curve of the explosion-proof shell under different metal wire net layers is compared and analyzed, and the explosion characteristic related parameters when the metal wire net layers are different are obtained.
2. The method for determining explosion suppression structure of explosion suppression shell according to claim 1, wherein the number of metal wire mesh layers is fixed, different explosion simulations are performed by changing the number of metal wire mesh, and the explosion characteristic related parameters obtained under the explosion simulations of different metal wire mesh numbers are compared and analyzed to determine the optimal number of metal wire mesh when the number of metal wire mesh layers is fixed.
3. The method of claim 2, wherein the explosion characteristic related parameters include a maximum explosion pressure value, a maximum explosion pressure rise rate, and a maximum explosion index.
4. The method for determining the explosion suppression structure of the explosion suppression shell according to claim 1, wherein the optimal wire mesh number is fixed, different explosion simulation is performed by changing the wire mesh number, explosion characteristic related parameters under the explosion simulation of different wire mesh numbers are compared and analyzed, and the optimal wire mesh number when the optimal wire mesh number is fixed is determined.
5. The method for determining an explosion suppression structure of an explosion suppression housing according to any one of claims 1 to 4, wherein different explosion simulations are performed by changing the number of layers of the wire mesh and the number of the wire mesh, the explosion pressure curves of the explosion suppression housing under different numbers of layers and numbers of the wire mesh are compared and analyzed, and the maximum explosion pressure value, the maximum explosion pressure rising rate and the maximum explosion index in each explosion simulation are compared to determine the optimal number of layers and number of the wire mesh.
6. The method for determining explosion suppression structure of explosion suppression housing according to claim 5, wherein, In the step S3 of the process, Step S31, selecting the optimal number of layers and the optimal number of metal wire meshes, and preparing an explosion suppression member composed of stainless steel metal wire meshes; Step S32, setting an empty shell explosion experiment scheme, and setting three experiment sample schemes according to different distances between ignition sources and explosion suppression components, so as to provide a scheme for explosion suppression effect experiment verification of an explosion suppression structure of an explosion suppression shell; Step S33, arranging a pressure sensor on the side surface of the explosion-proof shell, arranging an air inlet and an air outlet at the left side plate and the right side plate of the explosion-proof shell in a diagonal manner, arranging an ignition source at the front panel of the explosion-proof shell, and performing experimental arrangement for performing experimental verification of the explosion suppression effect of the explosion-proof structure of the explosion-proof shell; And step S34, performing explosion simulation on the empty shell explosion experimental scheme and the three experimental sample schemes in the step S32, and performing experimental verification on the explosion suppression effect of the explosion suppression structure of the explosion suppression shell.

Description

Method for determining explosion suppression structure of explosion-proof shell Technical Field The invention relates to the field of explosion-proof shells, in particular to a method for determining an explosion-proof structure of an explosion-proof shell. Background By "flameproof enclosure" is meant an enclosure that allows for the explosive gases entering the interior to burn and explode within the enclosure, but does not allow the explosion products to blast the enclosure or to blow out from the interior of the enclosure to the exterior of the enclosure through any passage to the exterior of the enclosure, igniting the surrounding air mixture. According to the explosion-proof principle, the explosion-proof shell must have enough mechanical strength to bear explosion pressure generated when explosion occurs in the shell, and the explosion-proof shell cannot be seriously deformed or damaged, and gaps among parts of the explosion-proof shell, namely various channels from the interior to the exterior of the shell, must have proper mechanical dimensions, so that energy carried by explosion products in the shell when the explosion products are out of the shell can be reduced, and even the explosion products are prevented from being out of the shell. In this way ignition of the air mixture around the device is avoided. Chinese patent publication No. CN110829685A discloses a high-sealing explosion-proof motor shell, and relates to the technical field of motors. The invention comprises a shell and bolts, wherein four mounting plates are fixedly connected to the peripheral side surface of the shell in a fan shape, a front end cover and an inner end cover are respectively and fixedly arranged at two sides of the shell, an annular plate and an ear plate are fixedly connected to one side of the front end cover, annular grooves are formed in two end surfaces of the shell, grooves are formed in two end surfaces of the mounting plates, two through grooves are formed in positions, corresponding to the grooves, of the upper surface of the mounting plate, and a disassembling plate is in sliding fit with the inner parts of the through grooves. Therefore, the types of the electrical components in the explosion-proof housing are numerous and complicated, so that the explosion-proof housing has various functions, and most of the explosion-proof housings applied to industrial sites have complicated electrical functions, huge quantity and scattered installation. Disclosure of Invention Therefore, the invention aims to provide a method for determining the explosion suppression structure of the explosion-proof shell, which has the advantages of realizing the safety and the light weight of the explosion-proof shell. In order to achieve the above object, the present invention provides a method for determining an explosion suppression structure of an explosion suppression housing, comprising, Step S1, researching an explosion suppression structure, and preliminarily determining the explosion suppression structure of the selected explosion suppression material and the explosion suppression shell; step S2, establishing a three-dimensional model for the explosion suppression structure of the explosion suppression shell in the step S1, performing explosion simulation, and primarily determining the number of layers and the number of the metal wire meshes; and step S3, experimental verification is carried out on the explosion suppression structures of the explosion suppression shells determined in the step S1 and the step S2, and the accuracy of the step S1 and the step S2 is determined. Further, in step S1, the explosion suppression material is selected from a stainless steel wire mesh, the explosion suppression structure of the explosion suppression housing is an explosion suppression member formed by the stainless steel wire mesh, and the cross-sectional dimension of the explosion suppression member is set to be the same as that of the explosion suppression housing. Further, in step S2, a physical model of the flameproof enclosure in a proportion of 1:1 with the real object is established through software, the established physical model is divided by adopting polyhedral grids, and grid independence is evaluated through repeated simulation of different grid numbers. Further, in step S2, when the explosion-proof housing physical model is subjected to explosion simulation to determine the mesh number of the metal wires, the number of layers of the metal wires is fixed, the metal wires with different mesh numbers are subjected to explosion simulation, explosion pressure curves of the explosion-proof housing under different mesh numbers of the metal wires are compared and analyzed, and relevant parameters of explosion characteristics when the mesh numbers of the metal wires are different are obtained. Further, by fixing the number of layers of the metal wire mesh, different blasting simulation is performed by changing the mesh number of th