WO2020249077A1 - Metal explosion-proof device for high-voltage cable joint, and end part parameter determination method and system - Google Patents

Metal explosion-proof device for high-voltage cable joint, and end part parameter determination method and system Download PDF

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Publication number
WO2020249077A1
WO2020249077A1 PCT/CN2020/095788 CN2020095788W WO2020249077A1 WO 2020249077 A1 WO2020249077 A1 WO 2020249077A1 CN 2020095788 W CN2020095788 W CN 2020095788W WO 2020249077 A1 WO2020249077 A1 WO 2020249077A1
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Prior art keywords
flange
explosion
proof device
connection point
stress
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PCT/CN2020/095788
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French (fr)
Chinese (zh)
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钟其达
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广东安诺新材料科技有限公司
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Publication of WO2020249077A1 publication Critical patent/WO2020249077A1/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G15/00—Cable fittings
    • H02G15/02—Cable terminations
    • H02G15/04—Cable-end sealings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G15/00—Cable fittings
    • H02G15/02—Cable terminations
    • H02G15/06—Cable terminating boxes, frames or other structures

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  • the present invention relates to the technical field of power systems and equipment, and in particular to a high-voltage cable joint metal explosion-proof device and a method and system for determining terminal head parameters.
  • the existing patented technology optimizes the structure of the end part of the metal-type high-voltage cable joint explosion-proof device, and uses a certain bending arc to balance the internal gas pressure distribution.
  • the arc design for the end part is difficult to process in the actual process, and the early design and manufacturing costs are high, and the feasibility is low.
  • the object of the present invention is to provide a high-voltage cable joint metal explosion-proof device and a method and system for determining the parameters of the end head.
  • the explosion-proof device has simple processing technology, low implementation cost, and can achieve the purpose of balancing the internal stress distribution, thereby improving the device Explosion-proof performance.
  • the present invention provides a metal explosion-proof device for a high-voltage cable joint, the explosion-proof device includes: a middle shell, a broken line end, a shell flange and an end flange;
  • the intermediate housing is located between the two broken line-shaped end heads, and the housing flange and the end method are sequentially arranged between the intermediate housing and each of the broken line-shaped end heads
  • the flange of the housing and the end flange are butted so that the intermediate housing and the broken line end are connected in a sealed manner.
  • the explosion-proof device further includes a plurality of pressure relief units, the pressure relief unit including a pressure relief hole, a pressure relief hole cover and a spring screw, the pressure relief hole is provided on the intermediate housing, so The pressure relief hole and the pressure relief hole cover are connected by the spring screw flange.
  • the explosion-proof device further includes a connecting bolt, and the housing flange and the end flange are connected by the connecting bolt.
  • a method for determining end head parameters of a metal explosion-proof device for a high-voltage cable joint the method is used in the explosion-proof device, and the method includes:
  • the flange size includes the thickness of the shell flange and the shell Flange width, end flange thickness and end flange width;
  • the bending angle and flange size of the broken-line end head with the most balanced stress distribution on the inner wall of the explosion-proof device are determined.
  • the specific method for determining the bending angle of the broken-line end head with the most balanced stress distribution on the inner wall of the explosion-proof device includes:
  • Data fitting is performed on the relationship graph between the bending angle and the maximum stress value at the first connection point to obtain the functional relationship between the bending angle and the maximum stress value at the first connection point;
  • Derivation of the functional relationship is performed, and the bending angle corresponding to the minimum value of the derivative is recorded as the optimal bending angle.
  • the specific method for determining the flange size with the most balanced stress distribution on the inner wall of the explosion-proof device includes:
  • the stress value at the second connection point and the average stress value borne by the inner wall of the explosion-proof device are calculated by simulation, and the second connection point is the broken line end The connection point between the broken line part of the part and the end flange;
  • the optimal flange size is determined according to the flange thickness and flange width corresponding to the minimum stress distortion coefficient, the stress distortion coefficient being the ratio of the stress value at the second connection point to the average stress value borne by the inner wall of the explosion-proof device.
  • the stress value of the second connection point corresponding to the optimal flange size under the simulated explosion energy is less than the material fracture stress of the broken-line end head, and the simulated explosion energy is the energy generated when the actual cable joint explodes.
  • the stress distortion coefficient corresponding to the optimal flange size is less than 2.
  • a system for determining the head parameters of the metal explosion-proof device of a high-voltage cable joint the system is used in the explosion-proof device, and the system includes:
  • Cavity stress calculation module used to use the finite element calculation method of electric field, temperature field, flow field and displacement field coupling, based on the three-layer iterative algorithm to obtain the stress value of the metal explosion-proof cavity at different times and different end structures;
  • the maximum stress calculation module of the connection point is used to calculate the stress on the inner wall of the explosion-proof device under different bending angles and different flange sizes, and obtain the maximum stress value of each connection point of the broken-line end head and the middle shell.
  • the flange size Including shell flange thickness, shell flange width, end flange thickness and end flange width;
  • the parameter determination module is used to determine the bending angle and flange size of the broken line end head of the explosion-proof device inner wall with the most balanced stress distribution according to the maximum stress value of each connection point under different bending angles and different flange sizes.
  • the present invention discloses the following technical effects:
  • the high-voltage cable joint metal explosion-proof device includes: a middle shell, a broken-line end head, a shell flange and an end flange.
  • the middle shell is located between the two broken line-shaped end heads, and a shell flange and the end flange, the shell flange and the end head are sequentially arranged between the middle shell and each broken line-shaped end head.
  • the butt joint of the head flange makes the intermediate shell and the broken-line end head sealedly connected, the processing technology of the explosion-proof device is simple and the implementation cost is low.
  • the present invention also provides a method and system for determining the parameters of the end head. By optimizing the bending angle of the broken line part, the thickness and width of the flange at the connection between the broken line end head and the middle shell can achieve the purpose of equalizing the internal stress distribution and improve The explosion-proof performance of the device.
  • FIG. 1 is a partial schematic diagram of the connection point of the broken-line end head of a metal explosion-proof device for a high-voltage cable joint according to Embodiment 1 of the present invention
  • FIG. 2 is a flowchart of a method for determining the head parameters of a metal explosion-proof device for high-voltage cable joints according to Embodiment 2 of the present invention
  • FIG. 3 is a structural block diagram of a system for determining head parameters of a metal explosion-proof device for high-voltage cable joints according to Embodiment 3 of the present invention
  • Fig. 4 is a diagram of the coupling action relationship of multi-physics coupling provided by the present invention.
  • Figure 5 is a distribution diagram of the maximum stress of the explosion-proof device provided by the present invention.
  • Figure 6 is a comparison diagram of stress distribution provided by the present invention.
  • Fig. 7 is a graph of stress changes at different angles at the first connection point provided by the present invention.
  • Figure 8 is the stress distribution from the end portion to the connection of the shell provided by the present invention.
  • FIG. 9 is a partial structure diagram of a metal explosion-proof device for high-voltage cable joints provided by the present invention.
  • Fig. 10 is an overall structure diagram of a metal explosion-proof device for a high-voltage cable joint provided by the present invention.
  • the purpose of the present invention is to provide a metal explosion-proof device for high-voltage cable joints and a method and system for determining end head parameters.
  • the explosion-proof device has simple processing technology, low implementation cost, and can achieve the purpose of balancing internal stress distribution, thereby improving the explosion-proof performance of the device .
  • FIG. 1 is a partial schematic diagram of the connection point of the broken-line end of a metal explosion-proof device for a high-voltage cable joint according to Embodiment 1 of the present invention.
  • the high-voltage cable joint metal explosion-proof device includes: a middle shell 1, a broken line end 2, a shell flange 3 and an end flange 4.
  • the middle shell is a cylindrical shell and is located between the two broken-line end heads 2.
  • a shell flange 3 and an end flange 4 are sequentially arranged between the middle shell 1 and each broken-line end head 2 ,
  • the shell flange 3 and the end flange 4 are butted to make the intermediate shell 1 and the broken-line end head 2 hermetically connected.
  • the broken line-shaped end head 2 includes a broken line part 5 and a cable piercing part 6, and the cable piercing part 6 is connected to a cable joint.
  • the broken-line end head 2 of the high-voltage cable joint explosion-proof device is connected with the intermediate housing 1 at the second connection point 8. Because of the segmented structure, the second connection point 8 is connected by two flanges by bolts, that is, the housing The flange 3 and the end flange 4 are connected by connecting bolts.
  • FIG. 9 is a partial structure diagram of a metal explosion-proof device for high-voltage cable joints provided by the present invention
  • FIG. 10 is an overall structure diagram of a metal explosion-proof device for high-voltage cable joints provided by the present invention.
  • the explosion-proof device also includes two pressure relief units A and two observation units B.
  • the pressure relief unit A includes a pressure relief hole 9, a pressure relief hole cover 10 and a spring screw 11.
  • the pressure relief hole 9 Set on the intermediate housing 1, the pressure relief hole 9 and the pressure relief hole cover 10 are flange-connected by a spring screw 11.
  • the observation unit B includes an observation window, an observation window cover 17 and a screw 18.
  • the observation window is a through hole provided on the intermediate housing 1, and the observation window and the observation window cover 17 are flange-connected by the screw 18.
  • the function of the observation unit B is to facilitate the opening of the explosion-proof device for internal maintenance.
  • the difference between pressure relief unit A and observation unit B is that the screws in pressure relief unit A are spring screws, while the screws in observation unit B do not contain springs.
  • the middle shell 1 is divided into an upper body 16 and a lower body 15, and the upper body 16 and the lower body 15 are both semi-cylindrical shells. Both the pressure relief unit A and the observation unit B are arranged on the upper body 16.
  • the upper main body 16 and the lower main body 15 are connected into a cylinder by the main body side strip flange 17, and the main body side strip flange 17 is strip-shaped.
  • the two ends of the main body side strip flange 17 are respectively connected with the shell flange 3.
  • the broken-line end head 2 includes two fan-shaped curved flanges.
  • the fan-shaped curved flange is composed of the fan-shaped curved surface 12 between the broken lines 5 and the end flange 4, and one of the fan-shaped curved flanges is provided with two cylindrical through holes. 13.
  • Two cylindrical through holes 13 are used as double ground wire outlets, and the cable passing part 6 includes a cylindrical wire outlet composed of a semi-cylindrical 14.
  • the pressure relief hole 9 is provided with a metal pressure relief explosion-proof membrane.
  • the spring in the spring screw 11 is a spring matched by pressure calculation.
  • the spring screw 11 is a fastener installed on the pressure relief hole 9 for the pressure relief hole cover 10, and the spring screw 11 allows the pressure relief hole cover 10 and spring screw 11 to be installed. Ensure a certain bounce distance between the heads. When the high-voltage cable head explodes, the pressure relief hole cover 10 bounces to relieve the pressure and rebound at the same time.
  • the automatic fire extinguishing device built in the metal explosion-proof cavity starts the fire and extinguishes the gas. Stay in the metal explosion-proof cavity to isolate the metal explosion-proof cavity from the outside world to prevent re-ignition of the explosion.
  • Fig. 2 is a flowchart of a method for determining the head parameters of a metal explosion-proof device for a high-voltage cable joint according to Embodiment 2 of the present invention. As shown in Figure 2, the method is applied to the explosion-proof device of Embodiment 1. The method includes:
  • Step 201 Using a finite element calculation method coupled with electric field, temperature field, flow field and displacement field, based on a three-layer iterative algorithm, the stress values borne inside the metal explosion-proof cavity with different end structures at different times are obtained.
  • Step 202 Calculate the stress on the inner wall of the explosion-proof device under different bending angles ⁇ and different flange sizes, and obtain the maximum stress value of each connection point of the broken-line end head 2 and the intermediate shell 1.
  • the flange size includes the shell flange Thickness, shell flange width, end flange thickness and end flange width.
  • the bending angle ⁇ is the difference between the angle between the folded line portion 5 and the cable insertion portion 6 and the right angle.
  • Step 203 According to the maximum stress value of each connection point under different bending angles and different flange sizes, the bending angle and flange size of the broken-line end head with the most balanced stress distribution on the inner wall of the explosion-proof device are determined.
  • the specific method for determining the bending angle ⁇ of the broken-line end of the inner wall of the explosion-proof device with the most balanced stress distribution includes:
  • the first connection point 7 It is the connection point between the broken line part 5 of the broken line-shaped end head 2 and the cable insertion part 6.
  • the specific method for determining the flange size with the most balanced stress distribution on the inner wall of the explosion-proof device in step 203 includes:
  • the stress value P 2 at the second connection point 8 and the average stress value P av borne by the inner wall of the explosion-proof device are calculated by simulation, and the second connection point 8 is a broken line shape The connection point between the broken line portion 5 of the end head 2 and the end flange 4.
  • the stress distortion coefficient is the ratio of the stress value P 2 at the second connection point 8 to the average stress value P av on the inner wall of the explosion-proof device .
  • the final determined optimal shell flange thickness and optimal end flange thickness are the flange thickness corresponding to the minimum stress distortion coefficient, the optimal shell flange width and the optimal end flange
  • the width is the flange width corresponding to the minimum stress distortion coefficient.
  • this embodiment also verifies whether the stress value at the second connection point 8 exceeds the fracture stress of the material at the broken-line end under the energy generated when the actual cable joint explodes through simulation. Claim. At the same time, in order to ensure the stress balance of the inner wall of the explosion-proof device, the stress distortion coefficient corresponding to the optimal flange size in this embodiment is less than 2.
  • Fig. 3 is a structural block diagram of a system for determining head parameters of a metal explosion-proof device for high-voltage cable joints according to Embodiment 3 of the present invention. As shown in Figure 3, the system is used in the explosion-proof device of Example 1.
  • the system includes:
  • the cavity stress calculation module 301 is used to use the finite element calculation method of electric field, temperature field, flow field and displacement field coupling, based on the three-layer iterative algorithm to obtain the stress value of the metal explosion-proof cavity at different moments and different end structures .
  • the maximum stress calculation module 302 of the connection point is used to calculate the stress on the inner wall of the explosion-proof device under different bending angles and different flange sizes, and obtain the maximum stress value of each connection point of the broken-line end head and the middle shell.
  • the flange size includes Shell flange thickness, shell flange width, end flange thickness and end flange width.
  • the parameter determination module 303 is used for determining the bending angle and flange size of the broken-line end head of the explosion-proof device inner wall with the most balanced stress distribution according to the maximum stress value of each connection point under different bending angles and different flange sizes.
  • the cable joint Once the cable joint has a short-circuit arc, its energy value will quickly reach a steady state, maintaining a stable heat source to generate energy. After the arc is generated, the temperature around the arc rises rapidly, and the cable is burned through, directly contacting the air, neglecting the weak effect of the remaining cable material on the entire explosion process. It is assumed that the explosion-proof device has good airtightness when the energy is not discharged, and there is no leakage during gas expansion; ignore the ablation of the copper conductor at both ends and the surrounding insulation medium by the arc in the insulation breakdown channel of the cable joint, that is, the metal is not considered The influence of vapor and organic vapor doped into gas on gas density.
  • the boundary condition of the temperature field is that the outermost layer is set as the convection exchange coefficient between the surface of the object and the surrounding environment, and the hole is set as the open boundary; the movement of the fluid in the flow field is affected by Dominated by inertial force, viscous force and electric field force, the boundary conditions adopted are to set the boundary condition of the hole as the outlet, and the other boundary as the wall.
  • the temperature, density, air flow velocity and pressure distribution of the gas in the explosion-proof cavity at different times and the stress value borne by the cavity inner wall can be calculated.
  • the temperature around the arc rises rapidly, and the energy in the air molecules increases rapidly, causing the air around the arc to flow instantaneously.
  • the energy released by the arc cannot be released, causing the internal gas to expand and the air pressure to rise rapidly.
  • the absolute pressure of the gas inside the explosion-proof device increases, the gas acts on the shell, resulting in different stress values at different points of the shell, resulting in different degrees of deformation of the explosion-proof device structure. Therefore, the stress distribution of the explosion-proof device can be obtained from the simulation calculation, and the stress distribution of the end of the explosion-proof device can be designed.
  • the absolute pressure of the gas inside the explosion-proof device rises, which causes the structure of the protection device to undergo different degrees of deformation, and the deformation of the protection device is reflected according to the stress of the protection device.
  • the shell of the explosion-proof device if the stress value exceeds the fracture stress of the shell, the shell is destroyed.
  • the local structure is different.
  • the stress value on the shell will also change. Therefore, changing the local structure of the shell can also optimize the stress distribution of the shell.
  • the stress change diagram at the first connection point 7 to the second connection point 8 is as follows Shown in Figure 6.
  • the volume of the explosion-proof housing decreases with the increase of the included angle ⁇ , when the same energy is generated inside, the smaller the volume, the greater the impact of the air pressure. Therefore, the corner angle at the first connection point should not be too large. Therefore, the practicability and economy of the explosion-proof device are comprehensively considered, and the angle ⁇ at the first connection point is finally selected as 60 degrees. Through the simulation results, it can be concluded that the 60° broken line structure can effectively reduce the stress on the shell.
  • flange thickness h is usually between 15-20mm, and the width L is usually between 40-50mm.
  • a number of flanges with typical sizes are selected for calculation in the simulation.
  • the ratio of the stress value P 2 at the second connection point to the shell average stress value P av is defined as the stress distortion coefficient f.
  • the stress value at the second connection point P 2 is 3.9 ⁇ 104 N/m 2
  • the average stress value P av of the shell is 2.7 ⁇ 104 N/m 2
  • the maximum stress value from the first connection point 7 to the second connection point 8 is 3.9 ⁇ 10 4 N/m 2 . Since the shell material of the cable joint protection device selected in the present invention is aluminum-magnesium alloy, the ultimate stress value when the material breaks is 2.2 ⁇ 10 8 N/m 2 under the energy generated by the actual cable joint explosion. It far exceeds the maximum stress value at the second connection point 8 after the flange is added, indicating that the flange structure will not break when an explosion occurs, which is practical.
  • the maximum stress value from the first connection point 7 to the second connection point 8 is about 7.1 ⁇ 10 4 N/m 2 , and the average The stress value is about 2 ⁇ 10 4 N/m 2 ; after the flange is added, the maximum stress value from the first connection point 7 to the second connection point 8 is about 3.9 ⁇ 10 4 N/m 2 , and the average stress value is about 2.2 ⁇ 10 4 N/m 2 , it can be seen that the maximum stress value after the flange is added is only 55% of the maximum stress value when the flange is not added, indicating that the stress value of the port connection point has been effectively reduced.
  • the invention utilizes the finite element calculation method of electric field, temperature field, flow field and displacement field coupling, based on a three-layer iterative algorithm to obtain the stress value of the inner wall of the cavity at different times inside the explosion-proof cavity; by designing the bending angle of the broken line, the end head The thickness and width of the flange at the connection between the position and the intermediate shell are calculated, and the stress on the inner wall of the lower end of the different structure is calculated to accurately obtain the maximum stress value of each connection point at the inner end and the end of the explosion-proof shell.
  • the average pressure value so as to select the most balanced design plan to withstand the stress, optimize the structure of the end of the protective shell of the high-voltage cable joint explosion-proof device, achieve the purpose of balancing the internal stress distribution, improve the explosion-proof performance of the device, and design for the explosion-proof device Provides a reliable theoretical calculation method.

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Abstract

Disclosed are a metal explosion-proof device for a high-voltage cable joint, and an end part parameter determination method and system. The metal explosion-proof device for a high-voltage cable joint provided in the present invention comprises: a middle shell, broken-line-shaped end parts, shell flanges and end flanges. The middle shell is located between two broken-line-shaped end parts, a shell flange and an end flange are sequentially arranged between the middle shell and each broken-line-shaped end part, and the shell flange and the end flange are butt jointed so that the middle shell and the broken-line-shaped end part are connected in a sealed manner. The explosion-proof device has a simple machining process and is low in terms of implementation cost. Further provided are an end portion parameter determination method and system. The aim of balancing internal stress distribution can be achieved by optimizing bending angles of broken-line parts and the thickness and width of flanges at junctions of broken-line end portions and a middle shell, and the explosion-proof performance of the device is improved.

Description

高压电缆接头金属防爆装置及端头部参数确定方法及系统High-voltage cable joint metal explosion-proof device and terminal head parameter determination method and system
本申请要求于2019年6月14日提交中国专利局，申请号为201910514790.8、发明名称为“高压电缆接头金属防爆装置及端头部参数确定方法及系统”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。This application claims the priority of the Chinese patent application filed with the Chinese Patent Office on June 14, 2019. The application number is 201910514790.8 and the invention title is "High-voltage cable joint metal explosion-proof device and method and system for determining end parameters". All of them The content is incorporated in this application by reference.
技术领域Technical field
本发明涉及电力系统与设备技术领域，特别是涉及一种高压电缆接头金属防爆装置及端头部参数确定方法及系统。The present invention relates to the technical field of power systems and equipment, and in particular to a high-voltage cable joint metal explosion-proof device and a method and system for determining terminal head parameters.
背景技术Background technique
电力电缆长期运行在高电压、大电流下，有可能因过载、绝缘老化以及接头故障等原因导致电缆附件绝缘诸多薄弱环节和缺陷的存在，若这些部位在高电压下出现高场强，极易引发局部放电的发生。局部放电会使绝缘介质被分解，并产生具有导电性的碳粒痕迹。当发生绝缘电弧击穿时，电缆导体瞬间对地短路将在绝缘击穿通道内释放巨大能量，最终导致电缆接头的绝缘介质烧毁、爆炸事故发生。当爆炸发生产生的巨大能量迅速释放，产生的冲击波或爆炸碎片对周围人及建筑装置存在巨大安全隐患。因而，需要在高压电缆接头处加装防爆装置以避免电缆接头爆炸而引起的二次伤害。Long-term operation of power cables under high voltage and high current may cause many weak links and defects in the insulation of cable accessories due to overload, insulation aging, and joint failure. If these parts have high field strength under high voltage, it is very easy to Initiate partial discharge. Partial discharge will decompose the insulating medium and produce traces of conductive carbon particles. When an insulation arc breakdown occurs, a short-circuit of the cable conductor to the ground will release huge energy in the insulation breakdown channel, which will eventually lead to the burning of the insulating medium of the cable joint and the occurrence of an explosion accident. When the explosion occurs, the huge energy is released quickly, and the shock wave or explosion fragments generated pose a huge safety hazard to surrounding people and construction equipment. Therefore, it is necessary to install an explosion-proof device at the high-voltage cable joint to avoid secondary damage caused by the explosion of the cable joint.
目前，市场上已开发一系列的金属型电缆接头防爆装置，以降低此爆炸事故带来的危害。由于金属型防爆装置端头处需要收缩以匹配电缆接头，因此在防爆装置端头部位存在内部压力不均衡的问题。当电缆接头发生爆炸时，巨大的电弧能量冲击防爆装置内壁，对内部产生的冲击力的分布将在端头部位产生畸变，造成端头部位某些点位承受的冲击应力远大于其他部位，使得端头部位更容易被炸裂。因而，需要对防爆装置端头部位形状进行合理的设计，以均衡爆炸时装置内部的冲击应力。At present, a series of metal-type cable joint explosion-proof devices have been developed on the market to reduce the harm caused by this explosion accident. Since the end of the metal explosion-proof device needs to be shrunk to match the cable joint, there is a problem of unbalanced internal pressure at the end of the explosion-proof device. When the cable joint explodes, the huge arc energy impacts the inner wall of the explosion-proof device, and the distribution of the impact force generated inside will be distorted at the end part, causing some points of the end part to bear the impact stress much greater than other parts , Making the tip part easier to burst. Therefore, a reasonable design of the shape of the end of the explosion-proof device is required to balance the impact stress inside the device during the explosion.
已有专利技术对金属型高压电缆接头防爆装置的端头部位结构进行优化，采用了一定的弯曲弧度以均衡内部气体压力分布。但是，针对端头部位的弧度设计在实际加工过程中的加工难度大，前期设计及制造成本较高，可行性较低。The existing patented technology optimizes the structure of the end part of the metal-type high-voltage cable joint explosion-proof device, and uses a certain bending arc to balance the internal gas pressure distribution. However, the arc design for the end part is difficult to process in the actual process, and the early design and manufacturing costs are high, and the feasibility is low.
发明内容Summary of the invention
基于此，本发明的目的是提供一种高压电缆接头金属防爆装置及端头部参数确定方法及系统，防爆装置的加工工艺简单，实施成本低，能够达到均衡内部应力分布的目的，从而提高装置的防爆性能。Based on this, the object of the present invention is to provide a high-voltage cable joint metal explosion-proof device and a method and system for determining the parameters of the end head. The explosion-proof device has simple processing technology, low implementation cost, and can achieve the purpose of balancing the internal stress distribution, thereby improving the device Explosion-proof performance.
为实现上述目的，本发明提供了一种高压电缆接头金属防爆装置，所述防爆装置包括：中间壳体、折线形端头部、壳体法兰和端头法兰；In order to achieve the above objective, the present invention provides a metal explosion-proof device for a high-voltage cable joint, the explosion-proof device includes: a middle shell, a broken line end, a shell flange and an end flange;
所述中间壳体位于两个所述折线形端头部之间，所述中间壳体与每一所述折线形端头部之间依次设置有所述壳体法兰和所述端头法兰，所述壳体法兰和所述端头法兰对接使所述中间壳体和所述折线形端头部密封连接。The intermediate housing is located between the two broken line-shaped end heads, and the housing flange and the end method are sequentially arranged between the intermediate housing and each of the broken line-shaped end heads The flange of the housing and the end flange are butted so that the intermediate housing and the broken line end are connected in a sealed manner.
可选的，所述防爆装置还包括多个泄压单元，所述泄压单元包括泄压孔、泄压孔封盖和弹簧螺丝，所述泄压孔设置在所述中间壳体上，所述泄压孔和所述泄压孔封盖通过所述弹簧螺丝法兰连接。Optionally, the explosion-proof device further includes a plurality of pressure relief units, the pressure relief unit including a pressure relief hole, a pressure relief hole cover and a spring screw, the pressure relief hole is provided on the intermediate housing, so The pressure relief hole and the pressure relief hole cover are connected by the spring screw flange.
可选的，所述防爆装置还包括连接螺栓，所述壳体法兰和所述端头法兰通过所述连接螺栓对接。Optionally, the explosion-proof device further includes a connecting bolt, and the housing flange and the end flange are connected by the connecting bolt.
一种高压电缆接头金属防爆装置端头部参数的确定方法，所述方法用于所述的防爆装置，所述方法包括：A method for determining end head parameters of a metal explosion-proof device for a high-voltage cable joint, the method is used in the explosion-proof device, and the method includes:
利用电场、温度场、流场和位移场耦合的有限元计算方法，基于三层迭代算法得到不同时刻、不同端部结构的金属防爆腔体内部承受的应力值；Using the finite element calculation method of coupling electric field, temperature field, flow field and displacement field, based on the three-layer iterative algorithm to obtain the stress value of the metal explosion-proof cavity at different times and different end structures;
计算不同弯曲角度和不同法兰尺寸下防爆装置内壁承受的应力，得出折线形端头部和中间壳体各连接点的最大应力值，所述法兰尺寸包括壳体法兰厚度、壳体法兰宽度、端头法兰厚度和端头法兰宽度；Calculate the stress on the inner wall of the explosion-proof device under different bending angles and different flange sizes, and obtain the maximum stress value of each connection point of the broken-line end head and the middle shell. The flange size includes the thickness of the shell flange and the shell Flange width, end flange thickness and end flange width;
根据不同弯曲角度和不同法兰尺寸下各连接点的最大应力值确定防爆装置内壁承受应力分布最均衡的折线形端头部的弯曲角度和法兰尺寸。According to the maximum stress value of each connection point under different bending angles and different flange sizes, the bending angle and flange size of the broken-line end head with the most balanced stress distribution on the inner wall of the explosion-proof device are determined.
可选的，确定防爆装置内壁承受应力分布最均衡的折线形端头部的弯曲角度的具体方法包括：Optionally, the specific method for determining the bending angle of the broken-line end head with the most balanced stress distribution on the inner wall of the explosion-proof device includes:
计算相同电弧能量下不同弯曲角度的折线形端头部在第一连接点处的最大应力值，获得弯曲角度与第一连接点处的最大应力值的关系图，所 述第一连接点为所述折线形端头部的折线部与电缆穿设部的连接点；Calculate the maximum stress value at the first connection point of the broken-line end head with different bending angles under the same arc energy, and obtain the relationship diagram between the bending angle and the maximum stress value at the first connection point. The connection point between the broken line part of the broken line-shaped end head and the cable insertion part;
对弯曲角度与第一连接点处的最大应力值的关系图进行数据拟合，得到弯曲角度与第一连接点处的最大应力值的函数关系式；Data fitting is performed on the relationship graph between the bending angle and the maximum stress value at the first connection point to obtain the functional relationship between the bending angle and the maximum stress value at the first connection point;
对所述函数关系式进行求导，将导数最小值对应的弯曲角度记为最优弯曲角度。Derivation of the functional relationship is performed, and the bending angle corresponding to the minimum value of the derivative is recorded as the optimal bending angle.
可选的，确定防爆装置内壁承受应力分布最均衡的法兰尺寸的具体方法包括：Optionally, the specific method for determining the flange size with the most balanced stress distribution on the inner wall of the explosion-proof device includes:
仿真计算法兰厚度为15-20mm，法兰宽度为40-50mm时，第二连接点处的应力值和防爆装置内壁承受的平均应力值，所述第二连接点为所述折线形端头部的折线部与端头法兰的连接点；When the flange thickness is 15-20mm and the flange width is 40-50mm, the stress value at the second connection point and the average stress value borne by the inner wall of the explosion-proof device are calculated by simulation, and the second connection point is the broken line end The connection point between the broken line part of the part and the end flange;
根据应力畸变系数最小值对应的法兰厚度和法兰宽度确定最优法兰尺寸，所述应力畸变系数为第二连接点处的应力值与防爆装置内壁承受的平均应力值的比值。The optimal flange size is determined according to the flange thickness and flange width corresponding to the minimum stress distortion coefficient, the stress distortion coefficient being the ratio of the stress value at the second connection point to the average stress value borne by the inner wall of the explosion-proof device.
可选的，最优法兰尺寸对应的第二连接点在模拟爆炸能量下的应力值小于折线形端头部的材料断裂应力，所述模拟爆炸能量为实际电缆接头发生爆炸时产生的能量。Optionally, the stress value of the second connection point corresponding to the optimal flange size under the simulated explosion energy is less than the material fracture stress of the broken-line end head, and the simulated explosion energy is the energy generated when the actual cable joint explodes.
可选的，最优法兰尺寸对应的应力畸变系数小于2。Optionally, the stress distortion coefficient corresponding to the optimal flange size is less than 2.
一种高压电缆接头金属防爆装置端头部参数的确定系统，所述系统用于所述的防爆装置，所述系统包括：A system for determining the head parameters of the metal explosion-proof device of a high-voltage cable joint, the system is used in the explosion-proof device, and the system includes:
腔体应力计算模块，用于利用电场、温度场、流场和位移场耦合的有限元计算方法，基于三层迭代算法得到不同时刻、不同端部结构的金属防爆腔体内部承受的应力值；Cavity stress calculation module, used to use the finite element calculation method of electric field, temperature field, flow field and displacement field coupling, based on the three-layer iterative algorithm to obtain the stress value of the metal explosion-proof cavity at different times and different end structures;
连接点最大应力计算模块，用于计算不同弯曲角度和不同法兰尺寸下防爆装置内壁承受的应力，得出折线形端头部和中间壳体各连接点的最大应力值，所述法兰尺寸包括壳体法兰厚度、壳体法兰宽度、端头法兰厚度和端头法兰宽度；The maximum stress calculation module of the connection point is used to calculate the stress on the inner wall of the explosion-proof device under different bending angles and different flange sizes, and obtain the maximum stress value of each connection point of the broken-line end head and the middle shell. The flange size Including shell flange thickness, shell flange width, end flange thickness and end flange width;
参数确定模块，用于根据不同弯曲角度和不同法兰尺寸下各连接点的最大应力值确定防爆装置内壁承受应力分布最均衡的折线形端头部的弯曲角度和法兰尺寸。The parameter determination module is used to determine the bending angle and flange size of the broken line end head of the explosion-proof device inner wall with the most balanced stress distribution according to the maximum stress value of each connection point under different bending angles and different flange sizes.
根据本发明提供的具体实施例，本发明公开了以下技术效果：According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:
本发明提供的高压电缆接头金属防爆装置包括：中间壳体、折线形端头部、壳体法兰和端头法兰。中间壳体位于两个所述折线形端头部之间，中间壳体与每一折线形端头部之间依次设置有壳体法兰和所述端头法兰，壳体法兰和端头法兰对接使中间壳体和折线形端头部密封连接，防爆装置的加工工艺简单，实施成本低。本发明还提供了端头部参数的确定方法及系统，通过优化折线部的弯曲角度，折线端头部和中间壳体连接处的法兰厚度和宽度，能够达到均衡内部应力分布的目的，提高装置的防爆性能。The high-voltage cable joint metal explosion-proof device provided by the present invention includes: a middle shell, a broken-line end head, a shell flange and an end flange. The middle shell is located between the two broken line-shaped end heads, and a shell flange and the end flange, the shell flange and the end head are sequentially arranged between the middle shell and each broken line-shaped end head. The butt joint of the head flange makes the intermediate shell and the broken-line end head sealedly connected, the processing technology of the explosion-proof device is simple and the implementation cost is low. The present invention also provides a method and system for determining the parameters of the end head. By optimizing the bending angle of the broken line part, the thickness and width of the flange at the connection between the broken line end head and the middle shell can achieve the purpose of equalizing the internal stress distribution and improve The explosion-proof performance of the device.
说明书附图Description and drawings
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings in the following description are only some of the present invention. Embodiments, for those of ordinary skill in the art, without creative work, other drawings can be obtained from these drawings.
图1为本发明实施例1提供的一种高压电缆接头金属防爆装置的折线形端头部连接点的局部示意图；FIG. 1 is a partial schematic diagram of the connection point of the broken-line end head of a metal explosion-proof device for a high-voltage cable joint according to Embodiment 1 of the present invention;
图2为本发明实施例2提供的一种高压电缆接头金属防爆装置端头部参数的确定方法的流程图；2 is a flowchart of a method for determining the head parameters of a metal explosion-proof device for high-voltage cable joints according to Embodiment 2 of the present invention;
图3为本发明实施例3提供的一种高压电缆接头金属防爆装置端头部参数的确定系统的结构框图；3 is a structural block diagram of a system for determining head parameters of a metal explosion-proof device for high-voltage cable joints according to Embodiment 3 of the present invention;
图4为本发明提供的多物理场耦合的耦合作用关系图；Fig. 4 is a diagram of the coupling action relationship of multi-physics coupling provided by the present invention;
图5为本发明提供的防爆装置应力最大值分布图；Figure 5 is a distribution diagram of the maximum stress of the explosion-proof device provided by the present invention;
图6为本发明提供的应力分布对比图；Figure 6 is a comparison diagram of stress distribution provided by the present invention;
图7为本发明提供的第一连接点处不同夹角的应力变化曲线图；Fig. 7 is a graph of stress changes at different angles at the first connection point provided by the present invention;
图8为本发明提供的端头部位至壳体连接处的应力分布；Figure 8 is the stress distribution from the end portion to the connection of the shell provided by the present invention;
图9为本发明提供的一种高压电缆接头金属防爆装置的局部结构图；9 is a partial structure diagram of a metal explosion-proof device for high-voltage cable joints provided by the present invention;
图10为本发明提供的一种高压电缆接头金属防爆装置的整体结构图。Fig. 10 is an overall structure diagram of a metal explosion-proof device for a high-voltage cable joint provided by the present invention.
具体实施方式Detailed ways
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没 有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.
本发明的目的是提供一种高压电缆接头金属防爆装置及端头部参数确定方法及系统，防爆装置的加工工艺简单，实施成本低，能够达到均衡内部应力分布的目的，从而提高装置的防爆性能。The purpose of the present invention is to provide a metal explosion-proof device for high-voltage cable joints and a method and system for determining end head parameters. The explosion-proof device has simple processing technology, low implementation cost, and can achieve the purpose of balancing internal stress distribution, thereby improving the explosion-proof performance of the device .
为使本发明的上述目的、特征和优点能够更加明显易懂，下面结合附图和具体实施方式对本发明作进一步详细的说明。In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
实施例1：Example 1:
图1为本发明实施例1提供的一种高压电缆接头金属防爆装置的折线形端头部连接点的局部示意图。如图1所示，高压电缆接头金属防爆装置包括：中间壳体1、折线形端头部2、壳体法兰3和端头法兰4。中间壳体为圆柱形壳体，位于两个折线形端头部2之间，中间壳体1与每一折线形端头部2之间依次设置有壳体法兰3和端头法兰4，壳体法兰3和端头法兰4对接使中间壳体1和折线形端头部2密封连接。本实施例中，折线形端头部2包括折线部5和电缆穿设部6，电缆穿设部6与电缆接头连接。FIG. 1 is a partial schematic diagram of the connection point of the broken-line end of a metal explosion-proof device for a high-voltage cable joint according to Embodiment 1 of the present invention. As shown in Figure 1, the high-voltage cable joint metal explosion-proof device includes: a middle shell 1, a broken line end 2, a shell flange 3 and an end flange 4. The middle shell is a cylindrical shell and is located between the two broken-line end heads 2. A shell flange 3 and an end flange 4 are sequentially arranged between the middle shell 1 and each broken-line end head 2 , The shell flange 3 and the end flange 4 are butted to make the intermediate shell 1 and the broken-line end head 2 hermetically connected. In this embodiment, the broken line-shaped end head 2 includes a broken line part 5 and a cable piercing part 6, and the cable piercing part 6 is connected to a cable joint.
高压电缆接头防爆装置折线形端头部2与中间壳体1在第二连接点8处连接，因为采用分段式结构，第二连接点8处为两块法兰通过螺栓连接，即壳体法兰3和端头法兰4通过连接螺栓对接。The broken-line end head 2 of the high-voltage cable joint explosion-proof device is connected with the intermediate housing 1 at the second connection point 8. Because of the segmented structure, the second connection point 8 is connected by two flanges by bolts, that is, the housing The flange 3 and the end flange 4 are connected by connecting bolts.
图9为本发明提供的一种高压电缆接头金属防爆装置的局部结构图，图10为本发明提供的一种高压电缆接头金属防爆装置的整体结构图。如图9-10所示，防爆装置还包括两个泄压单元A和两个观察单元B，泄压单元A包括泄压孔9、泄压孔封盖10和弹簧螺丝11，泄压孔9设置在中间壳体1上，泄压孔9和泄压孔封盖10通过弹簧螺丝11法兰连接。观察单元B包括观察窗、观察窗封盖17和螺丝18，观察窗为设置在中间壳体1上的通孔，观察窗和观察窗封盖17通过螺丝18法兰连接。观察单元B的作用是便于打开防爆装置进行内部检修。泄压单元A和观察单元B的区别为，泄压单元A中螺丝为弹簧螺丝，而观察单元B中螺丝不含弹簧。中间壳体1分为上主体16和下主体15，上主体16和下主体15均为半圆柱壳体。泄压单元A和观察单元B均设置在上主体16上。上主体16和下主体15通过主体边条法兰17连接为圆柱体，主体边条法兰17为条形。 主体边条法兰17的两端分别与壳体法兰3连接。折线形端头部2包括两个扇形曲面法兰，扇形曲面法兰由折线部5之间的扇形曲面12与端头法兰4组成，其中一个扇形曲面法兰上设置两个柱形通孔13，两个柱形通孔13作为双地线出口，电缆穿设部6包括半圆柱14组成的圆柱体出线口。9 is a partial structure diagram of a metal explosion-proof device for high-voltage cable joints provided by the present invention, and FIG. 10 is an overall structure diagram of a metal explosion-proof device for high-voltage cable joints provided by the present invention. As shown in Figure 9-10, the explosion-proof device also includes two pressure relief units A and two observation units B. The pressure relief unit A includes a pressure relief hole 9, a pressure relief hole cover 10 and a spring screw 11. The pressure relief hole 9 Set on the intermediate housing 1, the pressure relief hole 9 and the pressure relief hole cover 10 are flange-connected by a spring screw 11. The observation unit B includes an observation window, an observation window cover 17 and a screw 18. The observation window is a through hole provided on the intermediate housing 1, and the observation window and the observation window cover 17 are flange-connected by the screw 18. The function of the observation unit B is to facilitate the opening of the explosion-proof device for internal maintenance. The difference between pressure relief unit A and observation unit B is that the screws in pressure relief unit A are spring screws, while the screws in observation unit B do not contain springs. The middle shell 1 is divided into an upper body 16 and a lower body 15, and the upper body 16 and the lower body 15 are both semi-cylindrical shells. Both the pressure relief unit A and the observation unit B are arranged on the upper body 16. The upper main body 16 and the lower main body 15 are connected into a cylinder by the main body side strip flange 17, and the main body side strip flange 17 is strip-shaped. The two ends of the main body side strip flange 17 are respectively connected with the shell flange 3. The broken-line end head 2 includes two fan-shaped curved flanges. The fan-shaped curved flange is composed of the fan-shaped curved surface 12 between the broken lines 5 and the end flange 4, and one of the fan-shaped curved flanges is provided with two cylindrical through holes. 13. Two cylindrical through holes 13 are used as double ground wire outlets, and the cable passing part 6 includes a cylindrical wire outlet composed of a semi-cylindrical 14.
泄压孔9内设有带金属泄压防爆膜，当金属防爆腔体内部压力过高时内部气体冲破防爆膜通过泄压孔9排出，实现泄压。弹簧螺丝11中的弹簧为经过压力计算匹配的弹簧，弹簧螺丝11为泄压孔封盖10安装在泄压孔9上的紧固件，弹簧螺丝11让泄压孔封盖10与弹簧螺丝11的头部之间保证一定的弹开间距，当高压电缆头发生爆炸时，泄压孔封盖10弹开泄压，同时回弹，金属防爆腔体内内置的自动灭火装置启动灭火，同时灭火气体留在金属防爆腔体内，让金属防爆腔体与外界隔绝，防止爆炸着火点复燃。The pressure relief hole 9 is provided with a metal pressure relief explosion-proof membrane. When the internal pressure of the metal explosion-proof cavity is too high, the internal gas breaks through the explosion-proof membrane and is discharged through the pressure relief hole 9 to achieve pressure relief. The spring in the spring screw 11 is a spring matched by pressure calculation. The spring screw 11 is a fastener installed on the pressure relief hole 9 for the pressure relief hole cover 10, and the spring screw 11 allows the pressure relief hole cover 10 and spring screw 11 to be installed. Ensure a certain bounce distance between the heads. When the high-voltage cable head explodes, the pressure relief hole cover 10 bounces to relieve the pressure and rebound at the same time. The automatic fire extinguishing device built in the metal explosion-proof cavity starts the fire and extinguishes the gas. Stay in the metal explosion-proof cavity to isolate the metal explosion-proof cavity from the outside world to prevent re-ignition of the explosion.
实施例2：Example 2:
图2为本发明实施例2提供的一种高压电缆接头金属防爆装置端头部参数的确定方法的流程图。如图2所示，方法用于实施例1的防爆装置，方法包括：Fig. 2 is a flowchart of a method for determining the head parameters of a metal explosion-proof device for a high-voltage cable joint according to Embodiment 2 of the present invention. As shown in Figure 2, the method is applied to the explosion-proof device of Embodiment 1. The method includes:
步骤201：利用电场、温度场、流场和位移场耦合的有限元计算方法，基于三层迭代算法得到不同时刻、不同端部结构的金属防爆腔体内部承受的应力值。Step 201: Using a finite element calculation method coupled with electric field, temperature field, flow field and displacement field, based on a three-layer iterative algorithm, the stress values borne inside the metal explosion-proof cavity with different end structures at different times are obtained.
步骤202：计算不同弯曲角度α和不同法兰尺寸下防爆装置内壁承受的应力，得出折线形端头部2和中间壳体1各连接点的最大应力值，法兰尺寸包括壳体法兰厚度、壳体法兰宽度、端头法兰厚度和端头法兰宽度。弯曲角度α为折线部5与电缆穿设部6的夹角与直角的差值。Step 202: Calculate the stress on the inner wall of the explosion-proof device under different bending angles α and different flange sizes, and obtain the maximum stress value of each connection point of the broken-line end head 2 and the intermediate shell 1. The flange size includes the shell flange Thickness, shell flange width, end flange thickness and end flange width. The bending angle α is the difference between the angle between the folded line portion 5 and the cable insertion portion 6 and the right angle.
步骤203：根据不同弯曲角度和不同法兰尺寸下各连接点的最大应力值确定防爆装置内壁承受应力分布最均衡的折线形端头部的弯曲角度和法兰尺寸。Step 203: According to the maximum stress value of each connection point under different bending angles and different flange sizes, the bending angle and flange size of the broken-line end head with the most balanced stress distribution on the inner wall of the explosion-proof device are determined.
具体地，步骤203中确定防爆装置内壁承受应力分布最均衡的折线形端头部的弯曲角度α的具体方法包括：Specifically, in step 203, the specific method for determining the bending angle α of the broken-line end of the inner wall of the explosion-proof device with the most balanced stress distribution includes:
计算相同电弧能量下不同弯曲角度的折线形端头部在第一连接点7的最大应力值，获得弯曲角度α与第一连接点7的最大应力值P 1的关系 图，第一连接点7为折线形端头部2的折线部5与电缆穿设部6的连接点。 Calculate the maximum stress value at the first connection point 7 of the broken-line end head with different bending angles under the same arc energy, and obtain the relationship diagram between the bending angle α and the maximum stress value P 1 of the first connection point 7. The first connection point 7 It is the connection point between the broken line part 5 of the broken line-shaped end head 2 and the cable insertion part 6.
对弯曲角度α与第一连接点7处的最大应力值P 1的关系图进行数据拟合，得到弯曲角度α与第一连接点7处的最大应力值P 1的函数关系式P 1＝f(α)，f表示α与P 1的映射关系。 Bending angle α of the first connection point 7 of the maximum stress value P 1 is diagram of data obtained by fitting the maximum stress at the bending angle α of the first connection point function formula 7 P 1 P 1 = f (α), f [alpha] represents the P 1 mapping relationship.
对函数关系式P 1＝f(α)进行求导，将导数最小值对应的弯曲角度记为最优弯曲角度α opt。 Derivation of the functional relationship P 1 =f(α) is performed, and the bending angle corresponding to the minimum value of the derivative is recorded as the optimal bending angle α opt .
具体地，步骤203中确定防爆装置内壁承受应力分布最均衡的法兰尺寸的具体方法包括：Specifically, the specific method for determining the flange size with the most balanced stress distribution on the inner wall of the explosion-proof device in step 203 includes:
仿真计算法兰厚度为15-20mm，法兰宽度为40-50mm时，第二连接点8处的应力值P 2和防爆装置内壁承受的平均应力值P av，第二连接点8为折线形端头部2的折线部5与端头法兰4的连接点。 When the flange thickness is 15-20mm and the flange width is 40-50mm, the stress value P 2 at the second connection point 8 and the average stress value P av borne by the inner wall of the explosion-proof device are calculated by simulation, and the second connection point 8 is a broken line shape The connection point between the broken line portion 5 of the end head 2 and the end flange 4.
根据应力畸变系数最小值对应的法兰厚度和法兰宽度确定最优法兰尺寸，应力畸变系数为第二连接点8处的应力值P 2与防爆装置内壁承受的平均应力值P av的比值。本实施例中，最终确定的最优壳体法兰厚度和最优端头法兰厚度均为应力畸变系数最小值对应的法兰厚度，最优壳体法兰宽度和最优端头法兰宽度均为应力畸变系数最小值对应的法兰宽度。 Determine the optimal flange size according to the flange thickness and flange width corresponding to the minimum stress distortion coefficient. The stress distortion coefficient is the ratio of the stress value P 2 at the second connection point 8 to the average stress value P av on the inner wall of the explosion-proof device . In this embodiment, the final determined optimal shell flange thickness and optimal end flange thickness are the flange thickness corresponding to the minimum stress distortion coefficient, the optimal shell flange width and the optimal end flange The width is the flange width corresponding to the minimum stress distortion coefficient.
为了进一步确定法兰结构的可行性，本实施例还通过仿真验证在实际电缆接头发生爆炸时产生的能量下，第二连接点8处的应力值是否超过折线形端头部的材料断裂应力的要求。同时，为了确保防爆装置内壁的应力均衡性，本实施例中最优法兰尺寸对应的应力畸变系数小于2。In order to further determine the feasibility of the flange structure, this embodiment also verifies whether the stress value at the second connection point 8 exceeds the fracture stress of the material at the broken-line end under the energy generated when the actual cable joint explodes through simulation. Claim. At the same time, in order to ensure the stress balance of the inner wall of the explosion-proof device, the stress distortion coefficient corresponding to the optimal flange size in this embodiment is less than 2.
实施例3：Example 3:
图3为本发明实施例3提供的一种高压电缆接头金属防爆装置端头部参数的确定系统的结构框图。如图3所示，系统用于实施例1的防爆装置，系统包括：Fig. 3 is a structural block diagram of a system for determining head parameters of a metal explosion-proof device for high-voltage cable joints according to Embodiment 3 of the present invention. As shown in Figure 3, the system is used in the explosion-proof device of Example 1. The system includes:
腔体应力计算模块301，用于利用电场、温度场、流场和位移场耦合的有限元计算方法，基于三层迭代算法得到不同时刻、不同端部结构的金属防爆腔体内部承受的应力值。The cavity stress calculation module 301 is used to use the finite element calculation method of electric field, temperature field, flow field and displacement field coupling, based on the three-layer iterative algorithm to obtain the stress value of the metal explosion-proof cavity at different moments and different end structures .
连接点最大应力计算模块302，用于计算不同弯曲角度和不同法兰尺寸下防爆装置内壁承受的应力，得出折线形端头部和中间壳体各连接点的最大应力值，法兰尺寸包括壳体法兰厚度、壳体法兰宽度、端头法兰厚度 和端头法兰宽度。The maximum stress calculation module 302 of the connection point is used to calculate the stress on the inner wall of the explosion-proof device under different bending angles and different flange sizes, and obtain the maximum stress value of each connection point of the broken-line end head and the middle shell. The flange size includes Shell flange thickness, shell flange width, end flange thickness and end flange width.
参数确定模块303，用于根据不同弯曲角度和不同法兰尺寸下各连接点的最大应力值确定防爆装置内壁承受应力分布最均衡的折线形端头部的弯曲角度和法兰尺寸。The parameter determination module 303 is used for determining the bending angle and flange size of the broken-line end head of the explosion-proof device inner wall with the most balanced stress distribution according to the maximum stress value of each connection point under different bending angles and different flange sizes.
本发明的具体实施过程如下：The specific implementation process of the present invention is as follows:
1、确定防爆装置腔体内不同时刻的应力分布1. Determine the stress distribution in the cavity of the explosion-proof device at different times
(1)多物理场耦合的有限元计算方法(1) Finite element calculation method of multi-physics coupling
电缆接头一旦出现短路电弧，其能量值将迅速达到稳态，保持稳定的热源产生能量。电弧产生后，由于电弧周围温度迅速升高，并将电缆烧穿，直接与空气接触，忽略剩下的电缆材料对整个爆炸过程中微弱作用。假设防爆装置未泄能时气密性很好，不存在在气体膨胀过程中泄漏的情况；忽略电缆接头绝缘击穿通道内电弧对两端铜导体和周围绝缘介质的烧蚀，即不考虑金属蒸气和有机蒸汽掺杂到气体后对气体密度的影响。基于以上假设，采用多物理场耦合问题，其实质是多物理场之间的信息传递问题，包括场源耦合、流固耦合和属性耦合等。仿真电缆接头的电磁场、热场、流场和应力场之间的耦合作用关系如图4所示。Once the cable joint has a short-circuit arc, its energy value will quickly reach a steady state, maintaining a stable heat source to generate energy. After the arc is generated, the temperature around the arc rises rapidly, and the cable is burned through, directly contacting the air, neglecting the weak effect of the remaining cable material on the entire explosion process. It is assumed that the explosion-proof device has good airtightness when the energy is not discharged, and there is no leakage during gas expansion; ignore the ablation of the copper conductor at both ends and the surrounding insulation medium by the arc in the insulation breakdown channel of the cable joint, that is, the metal is not considered The influence of vapor and organic vapor doped into gas on gas density. Based on the above assumptions, the use of multi-physics coupling is essentially the problem of information transfer between multi-physics, including field-source coupling, fluid-structure coupling, and property coupling. Figure 4 shows the coupling relationship between the electromagnetic field, thermal field, flow field and stress field of the simulated cable joint.
其中，根据傅里叶传热定律和能量守恒定律，温度场的边界条件为最外层设置为物体表面与周围环境进行的对流交换系数，有孔设置为开边界；流场中流体的运动受惯性力、粘性力和电场力的支配，所采用的边界条件是设置孔的边界条件为出口，其他边界设置为壁。Among them, according to the Fourier law of heat transfer and the law of conservation of energy, the boundary condition of the temperature field is that the outermost layer is set as the convection exchange coefficient between the surface of the object and the surrounding environment, and the hole is set as the open boundary; the movement of the fluid in the flow field is affected by Dominated by inertial force, viscous force and electric field force, the boundary conditions adopted are to set the boundary condition of the hole as the outlet, and the other boundary as the wall.
(2)利用有限元计算软件，通过多物理场耦合的方法，计算防爆腔体内不同时刻气体的温度、密度、气流速度以及压强分布和腔体内壁承受的应力值。(2) Using finite element calculation software, through the method of multi-physics coupling, calculate the temperature, density, air flow velocity and pressure distribution of the gas in the explosion-proof cavity at different times and the stress value of the cavity wall.
1)根据热源、温度、初始标准大气压，计算热源单位时间释放的能量。1) Calculate the energy released by the heat source per unit time based on the heat source, temperature, and initial standard atmospheric pressure.
2)在流场中根据热源产生的和施加的边界条件，求解空气计算区域的温度、密度和速度等。2) In the flow field, the temperature, density and velocity of the air calculation area are solved according to the boundary conditions generated and imposed by the heat source.
3)判断相邻两个流场及计算值是否满足控制精度要求，若不满足，令迭代次数M＝M+1；重新计算流场，直至相邻两次迭代计算结果差值满足控制精度要求。3) Determine whether two adjacent flow fields and calculated values meet the control accuracy requirements. If they do not, set the number of iterations M = M+1; recalculate the flow field until the difference between the two adjacent iteration calculation results meets the control accuracy requirements .
4)将由流场分析模型中计算得到的压强载入固体力学，并结合相应的边界条件计算得到保护装置的所承受的应力。4) Load the pressure calculated from the flow field analysis model into solid mechanics, and combine the corresponding boundary conditions to calculate the stress that the protection device bears.
5)判断相邻两次迭代计算结果差值是否满足控制精度要求，若不满足，根据计算得到的温度、压强分布情况更新流体(空气)的物性参数，同时令迭代次数m＝m+1，再计算温度场和流场，重复上述1)-4)过程，直至相邻两次迭代计算三个物理场计算结果差值满足控制精度要求。5) Determine whether the difference between the calculation results of two adjacent iterations meets the control accuracy requirements. If not, update the physical properties of the fluid (air) according to the calculated temperature and pressure distribution, and set the number of iterations m = m+1, Then calculate the temperature field and flow field, repeat the above 1)-4) process, until two adjacent iterations to calculate the difference between the three physical field calculation results meet the control accuracy requirements.
6)程序将跳出内层物理场求解变量的收敛迭代过程，时间步长迭代次数n＝n+1进入下一个求解过程，直至时间步迭代数达到预设定的步数N时，程序完成外层时间步迭代，计算结束。6) The program will jump out of the convergent iterative process of solving variables in the inner physics field. The number of time step iterations n=n+1 enters the next solution process, until the time step iteration number reaches the preset number of steps N, the program completes the external Layer time step iteration, the calculation ends.
通过上述步骤可以计算得到防爆腔体内不同时刻气体的温度、密度、气流速度以及压强分布和腔体内壁承受的应力值。Through the above steps, the temperature, density, air flow velocity and pressure distribution of the gas in the explosion-proof cavity at different times and the stress value borne by the cavity inner wall can be calculated.
假设从t＝0时刻开始电弧产生(初始电弧能量7×10 13W/m 3)，当t＝150ms时，装置的泄能孔已经开始发挥泄能作用，降低装置内部压强。 Assuming that the arc is generated from time t=0 (initial arc energy 7×10 13 W/m 3 ), when t=150ms, the discharge hole of the device has already started to discharge energy, reducing the internal pressure of the device.
当电弧发生故障时，电弧周围温度迅速升高，空气分子内能迅速增大，导致电弧周围的空气瞬间流动。随着时间的发展，在密封空间内，由于电弧释放的能量不能释放，导致内部气体膨胀，气压迅速上升。当防爆装置内部气体绝对气压升高时，由于气体作用于壳体上，从而导致在壳体不同点处的应力值不同，导致防爆装置结构发生不同程度的形变。因此，由仿真计算可得出防爆装置的应力分布情况，并针对防爆装置端头部位的应力分布进行设计。When the arc fails, the temperature around the arc rises rapidly, and the energy in the air molecules increases rapidly, causing the air around the arc to flow instantaneously. With the development of time, in the sealed space, the energy released by the arc cannot be released, causing the internal gas to expand and the air pressure to rise rapidly. When the absolute pressure of the gas inside the explosion-proof device increases, the gas acts on the shell, resulting in different stress values at different points of the shell, resulting in different degrees of deformation of the explosion-proof device structure. Therefore, the stress distribution of the explosion-proof device can be obtained from the simulation calculation, and the stress distribution of the end of the explosion-proof device can be designed.
2、弧度的确定2. Determination of arc
在防爆装置密封情况下，防爆装置内壁所受应力随着壁厚的增加而减小。通过仿真可以发现，如图5所示，应力最大处为防爆装置弯曲连接点处。When the explosion-proof device is sealed, the stress on the inner wall of the explosion-proof device decreases as the wall thickness increases. It can be found through simulation that, as shown in Fig. 5, the point of maximum stress is at the bending connection point of the explosion-proof device.
在爆炸过程中，防爆装置内部气体绝对气压升高，导致保护装置结构发生不同程度的形变，根据保护装置的应力反应其形变情况。对于防爆装置的壳体来说，若应力值超过了壳体的断裂应力，壳体即被破坏。但局部结构不同，当防爆装置端头部位设置为不同壁厚时，对壳体的应力值也会发生改变。因而，改变壳体的局部结构，同样可以优化壳体应力分布。在端头部位和壳体连接处仿真设置折角、曲率弧度0.1、曲率弧度0.3、曲率 弧度0.5、曲率弧度0.7进行仿真计算，第一连接点7至第二连接点8处的应力变化图如图6所示。During the explosion, the absolute pressure of the gas inside the explosion-proof device rises, which causes the structure of the protection device to undergo different degrees of deformation, and the deformation of the protection device is reflected according to the stress of the protection device. For the shell of the explosion-proof device, if the stress value exceeds the fracture stress of the shell, the shell is destroyed. However, the local structure is different. When the end of the explosion-proof device is set with different wall thicknesses, the stress value on the shell will also change. Therefore, changing the local structure of the shell can also optimize the stress distribution of the shell. Set the bending angle, curvature radian 0.1, curvature radian 0.3, curvature radian 0.5, and curvature radian 0.7 at the joint between the end part and the shell for simulation calculation. The stress change diagram at the first connection point 7 to the second connection point 8 is as follows Shown in Figure 6.
由图6可知，在第一连接点处，随着曲率的增大，应力值不断增加。这是由于第一连接点处的两侧线段中间夹角减小，应力变大。因此在相同电弧能量下，在第一连接点处设置为折角结构时，壳体承受的应力最小。另外，由于第一连接点处负责衔接防爆装置的端口部位和主体部位，结合实际生产需要，最终确定在第一连接点处应采取折线型结构。It can be seen from Figure 6 that at the first connection point, as the curvature increases, the stress value continues to increase. This is because the angle between the line segments on both sides at the first connection point decreases and the stress becomes larger. Therefore, under the same arc energy, the shell bears the least stress when the angle structure is set at the first connection point. In addition, since the first connection point is responsible for connecting the port part and the main body part of the explosion-proof device, combined with actual production needs, it is finally determined that a broken line structure should be adopted at the first connection point.
3、弯曲角度的确定3. Determination of bending angle
在确定第一连接点处采取折线型结构之后，通过选取不同的折线角度，按照同样的方法对在相同电弧能量下，防爆装置端头部位在第一连接点处的最大应力值进行仿真，得到不同弯曲角度对应的在第一连接点处的最大应力值。对多组不同弯曲角度对应的在第一连接点处的最大应力值P 1进行数据拟合，得到弯曲角度α与在第一连接点处的最大应力值P 1的函数关系P 1＝f(α)，该拟合函数曲线图如图7所示。 After determining the polyline structure at the first connection point, by selecting different polyline angles, follow the same method to simulate the maximum stress value of the end of the explosion-proof device at the first connection point under the same arc energy. Obtain the maximum stress value at the first connection point corresponding to different bending angles. Data fitting is performed on the maximum stress value P 1 at the first connection point corresponding to multiple groups of different bending angles, and the functional relationship between the bending angle α and the maximum stress value P 1 at the first connection point P 1 =f( α), the curve of the fitting function is shown in Figure 7.
对拟合函数P 1＝f(α)进行计算和分析之后发现，当第一连接点至第二连接点处的折线与水平线的夹角即弯曲角度α越大时，应力值P 1越小，即经过求导之后，函数P 1＝f(α)的导函数P′ 1＝f′(α)始终小于0。当夹角α小于60度时，随着夹角α的不断增加，连接处的应力值P 1随之下降，且下降速度逐渐加快，即当α＜60°时，函数P 1＝f(α)的导函数P′ 1＝f′(α)＜0，且经过二次求导后的函数P″ 1＝f″(α)＜0；当夹角α大于60度时，随着夹角α的不断增加，连接处的应力P 1同样随之下降，但下降速度逐渐变缓，即当α＞60°时，函数P 1＝f(α)的导函数P′ 1＝f′(α)＜0，但经过二次求导后的函数P″ 1＝f″(α)＞0。这说明α＝60°这一点为函数P 1＝f(α)的拐点。当折角α＜60°度时，α越大，应力减小情况越明显；当折角α大于60度时，折角α角度的改变对改善应力的效果变得不太显著。 After calculating and analyzing the fitting function P 1 =f(α), it is found that when the angle between the broken line from the first connection point to the second connection point and the horizontal line, that is, the bending angle α, the greater, the smaller the stress value P 1 , i.e., after the elapsed derivation function P 1 = f (α) of the derivative function P '1 = f' (α ) is always less than zero. When the included angle α is less than 60 degrees, with the continuous increase of the included angle α, the stress value P 1 at the joint decreases, and the decreasing speed gradually accelerates, that is, when α<60°, the function P 1 =f(α ) of the derivative function P '1 = f' (α ) <0, and after the second request after conducting the function P "1 = f" (α) <0; when the angle [alpha] greater than 60 degrees, with an angle With the continuous increase of α, the stress P 1 at the connection also decreases, but the rate of decrease gradually slows down, that is, when α>60°, the derivative function P 1 =f(α) P′ 1 =f′(α )<0, but the function P" 1 =f"(α)>0 after the second derivative. This shows that α=60° is the inflection point of the function P 1 =f(α). When the folding angle α is less than 60 degrees, the greater α is, the more obvious the stress reduction is; when the folding angle α is greater than 60 degrees, the change of the folding angle α becomes less significant for improving the stress.
另外，由于防爆壳体的体积随着夹角α增大而减小，当内部产生相同能量时，体积越小，所承受气压的冲击力越大。故第一连接点处折角角度不宜过大。因此，对防爆装置实用性和经济性进行综合考虑，最终选取第一连接点处夹角α为60度。通过仿真结果可以得出，60°的折线型结构可以有效降低壳体承受的应力。In addition, since the volume of the explosion-proof housing decreases with the increase of the included angle α, when the same energy is generated inside, the smaller the volume, the greater the impact of the air pressure. Therefore, the corner angle at the first connection point should not be too large. Therefore, the practicability and economy of the explosion-proof device are comprehensively considered, and the angle α at the first connection point is finally selected as 60 degrees. Through the simulation results, it can be concluded that the 60° broken line structure can effectively reduce the stress on the shell.
4、针对连接法兰的优化设计4. Optimized design for connecting flange
在第二连接点处增加法兰，并通过螺栓连接，有利于加强装置厚度，提高对接准确性，均衡应力分布。在实际应用中，法兰厚度h通常在15-20mm之间，宽度L通常在40-50mm之间。为达到降低壳体应力的最优效果，在仿真中选择若干典型尺寸的法兰进行计算。将第二连接点处的应力值P 2与壳体平均应力值P av之比定义为应力的畸变系数f，通过计算发现当h＝20mm，L＝50mm时，第二连接点处的应力值P 2为3.9×104N/m 2，壳体的平均应力值P av为2.7×104N/m 2，畸变系数f＝1.4为最小值。因此最终选择壳体法兰3和端头法兰4的法兰厚度均为h＝20mm，壳体法兰3和端头法兰4的法兰宽度均为L＝50mm。 Adding a flange at the second connection point and connecting through bolts is beneficial to strengthen the thickness of the device, improve the accuracy of the docking, and balance the stress distribution. In practical applications, the flange thickness h is usually between 15-20mm, and the width L is usually between 40-50mm. In order to achieve the optimal effect of reducing the shell stress, a number of flanges with typical sizes are selected for calculation in the simulation. The ratio of the stress value P 2 at the second connection point to the shell average stress value P av is defined as the stress distortion coefficient f. It is found by calculation that when h=20mm and L=50mm, the stress value at the second connection point P 2 is 3.9×104 N/m 2 , the average stress value P av of the shell is 2.7×104 N/m 2 , and the distortion coefficient f=1.4 is the minimum value. Therefore, the final selection of the flange thickness of the shell flange 3 and the end flange 4 is h=20mm, and the flange width of the shell flange 3 and the end flange 4 are both L=50mm.
由于壳体承受的应力值随着时间不断增加，且当t＝150ms时，装置的泄能孔已经开始发挥泄能作用，降低装置内部压强，因此对t＝150ms时采用折角型设计的电缆接头防爆装置端头部位和壳体连接处添加法兰和不添加法兰的两种情况进行仿真，得到的第一连接点7至第二连接点8的应力分布如图8所示。Since the stress value borne by the shell continues to increase with time, and when t=150ms, the discharge hole of the device has already started to discharge energy, reducing the internal pressure of the device, so when t=150ms, the angled design of the cable joint is adopted The two cases of adding flanges and not adding flanges at the end of the explosion-proof device and the shell connection are simulated, and the stress distribution from the first connection point 7 to the second connection point 8 is obtained as shown in Fig. 8.
通过对仿真结果进行分析可知：Through the analysis of the simulation results:
1、添加法兰之后，第一连接点7至第二连接点8处的最大应力值为3.9×10 4N/m 2。由于本发明所选用的电缆接头保护装置采用的壳体材料为铝镁合金，在实际电缆接头发生爆炸产生的能量下，该材料发生断裂时的极限应力值为2.2×10 8N/m 2，远超过添加法兰后第二连接点8处的最大应力值，说明发生爆炸时法兰结构不会发生断裂，具有实际可行性。 1. After the flange is added, the maximum stress value from the first connection point 7 to the second connection point 8 is 3.9×10 4 N/m 2 . Since the shell material of the cable joint protection device selected in the present invention is aluminum-magnesium alloy, the ultimate stress value when the material breaks is 2.2×10 8 N/m 2 under the energy generated by the actual cable joint explosion. It far exceeds the maximum stress value at the second connection point 8 after the flange is added, indicating that the flange structure will not break when an explosion occurs, which is practical.
2、对图8两条拟合曲线分别进行数据分析可得，未加入法兰时，第一连接点7至第二连接点8的最大应力值约为7.1×10 4N/m 2，平均应力值约为2×10 4N/m 2；加入法兰之后，第一连接点7至第二连接点8的最大应力值约为3.9×10 4N/m 2，平均应力值约为2.2×10 4N/m 2，可见添加法兰之后最大应力值仅为未添加法兰时最大应力值的55％，说明端口连接点的应力值得到有效降低。 2. Perform data analysis on the two fitting curves in Fig. 8. When no flange is added, the maximum stress value from the first connection point 7 to the second connection point 8 is about 7.1×10 4 N/m 2 , and the average The stress value is about 2×10 4 N/m 2 ; after the flange is added, the maximum stress value from the first connection point 7 to the second connection point 8 is about 3.9×10 4 N/m 2 , and the average stress value is about 2.2 ×10 4 N/m 2 , it can be seen that the maximum stress value after the flange is added is only 55% of the maximum stress value when the flange is not added, indicating that the stress value of the port connection point has been effectively reduced.
3、将k定义为第一连接点7至第二连接点8的平均应力值与最大应力值之比，即k＝P av/P max，可得添加法兰之前k＝3.55，添加法兰之后k＝1.77，说明壳体结构的应力均衡性也得到了较大的改善，装置的安全系数和保护 效果也得到了有效的提高。 3. Define k as the ratio of the average stress value of the first connection point 7 to the second connection point 8 to the maximum stress value, that is, k=P av /P max , then k=3.55 before adding flange, add flange After k=1.77, it shows that the stress balance of the shell structure has also been greatly improved, and the safety factor and protection effect of the device have also been effectively improved.
本发明利用电场、温度场、流场和位移场耦合的有限元计算方法，基于三层迭代算法得到防爆腔体内部不同时刻腔体内壁承受的应力值；通过设计折线的弯曲角度，端头部位和中间壳体连接处的法兰厚度和宽度，对不同结构下端头内壁承受的应力进行计算，准确得出内部端头处各连接点的最大应力值及防爆壳体端头部位承受的平均压力值，从而选取承受应力最均衡的设计方案，优化了高压电缆接头防爆装置保护壳端头部位的结构，能够达到均衡内部应力分布的目的，提高了装置的防爆性能，为防爆装置设计提供了可靠的理论计算方法。The invention utilizes the finite element calculation method of electric field, temperature field, flow field and displacement field coupling, based on a three-layer iterative algorithm to obtain the stress value of the inner wall of the cavity at different times inside the explosion-proof cavity; by designing the bending angle of the broken line, the end head The thickness and width of the flange at the connection between the position and the intermediate shell are calculated, and the stress on the inner wall of the lower end of the different structure is calculated to accurately obtain the maximum stress value of each connection point at the inner end and the end of the explosion-proof shell. The average pressure value, so as to select the most balanced design plan to withstand the stress, optimize the structure of the end of the protective shell of the high-voltage cable joint explosion-proof device, achieve the purpose of balancing the internal stress distribution, improve the explosion-proof performance of the device, and design for the explosion-proof device Provides a reliable theoretical calculation method.
本说明书中各个实施例采用递进的方式描述，每个实施例重点说明的都是与其他实施例的不同之处，各个实施例之间相同相似部分互相参见即可。The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referred to each other.
本文中应用了具体个例对本发明的原理及实施方式进行了阐述，以上实施例的说明只是用于帮助理解本发明的核心思想；同时，对于本领域的一般技术人员，依据本发明的思想，在具体实施方式及应用范围上均会有改变之处。综上所述，本说明书内容不应理解为对本发明的限制。In this article, specific examples are used to illustrate the principles and implementation of the present invention. The description of the above examples is only used to help understand the core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, There will be changes in the specific implementation and the scope of application. In summary, the content of this specification should not be construed as limiting the present invention.

Claims (9)

  1. 一种高压电缆接头金属防爆装置，其特征在于，所述防爆装置包括：中间壳体、折线形端头部、壳体法兰和端头法兰；A metal explosion-proof device for high-voltage cable joints, which is characterized in that the explosion-proof device comprises: a middle shell, a broken line end, a shell flange and an end flange;
    所述中间壳体位于两个所述折线形端头部之间，所述中间壳体与每一所述折线形端头部之间依次设置有所述壳体法兰和所述端头法兰，所述壳体法兰和所述端头法兰对接使所述中间壳体和所述折线形端头部密封连接。The intermediate housing is located between the two broken line-shaped end heads, and the housing flange and the end method are sequentially arranged between the intermediate housing and each of the broken line-shaped end heads The flange of the housing and the end flange are butted so that the intermediate housing and the broken line end are connected in a sealed manner.
  2. 根据权利要求1所述的高压电缆接头金属防爆装置，其特征在于，所述防爆装置还包括连接螺栓，所述壳体法兰和所述端头法兰通过所述连接螺栓对接。The metal explosion-proof device for high-voltage cable joints according to claim 1, wherein the explosion-proof device further comprises a connecting bolt, and the shell flange and the end flange are butted by the connecting bolt.
  3. 根据权利要求1所述的高压电缆接头金属防爆装置，其特征在于，所述防爆装置还包括多个泄压单元，所述泄压单元包括泄压孔、泄压孔封盖和弹簧螺丝，所述泄压孔设置在所述中间壳体上，所述泄压孔和所述泄压孔封盖通过所述弹簧螺丝法兰连接。The metal explosion-proof device for high-voltage cable joints according to claim 1, wherein the explosion-proof device further comprises a plurality of pressure relief units, and the pressure relief unit includes a pressure relief hole, a pressure relief hole cover and a spring screw, so The pressure relief hole is provided on the intermediate housing, and the pressure relief hole and the pressure relief hole cover are connected by the spring screw flange.
  4. 一种高压电缆接头金属防爆装置端头部参数的确定方法，其特征在于，所述方法用于权利要求1-3任一项所述的防爆装置，所述方法包括：A method for determining end head parameters of a metal explosion-proof device for a high-voltage cable joint, wherein the method is used for the explosion-proof device according to any one of claims 1 to 3, and the method comprises:
    利用电场、温度场、流场和位移场耦合的有限元计算方法，基于三层迭代算法得到不同时刻、不同端部结构的金属防爆腔体内部承受的应力值；Using the finite element calculation method of coupling electric field, temperature field, flow field and displacement field, based on the three-layer iterative algorithm to obtain the stress value of the metal explosion-proof cavity at different times and different end structures;
    计算不同弯曲角度和不同法兰尺寸下防爆装置内壁承受的应力，得出折线形端头部和中间壳体各连接点的最大应力值，所述法兰尺寸包括壳体法兰厚度、壳体法兰宽度、端头法兰厚度和端头法兰宽度；Calculate the stress on the inner wall of the explosion-proof device under different bending angles and different flange sizes, and obtain the maximum stress value of each connection point of the broken-line end head and the middle shell. The flange size includes the thickness of the shell flange and the shell Flange width, end flange thickness and end flange width;
    根据不同弯曲角度和不同法兰尺寸下各连接点的最大应力值确定防爆装置内壁承受应力分布最均衡的折线形端头部的弯曲角度和法兰尺寸。According to the maximum stress value of each connection point under different bending angles and different flange sizes, the bending angle and flange size of the broken-line end head with the most balanced stress distribution on the inner wall of the explosion-proof device are determined.
  5. 根据权利要求4所述的高压电缆接头金属防爆装置端头部参数的确定方法，其特征在于，确定防爆装置内壁承受应力分布最均衡的折线形端头部的弯曲角度的具体方法包括：The method for determining the parameters of the end head of the metal explosion-proof device for high-voltage cable joints according to claim 4, wherein the specific method for determining the bending angle of the broken-line end head with the most balanced stress distribution on the inner wall of the explosion-proof device includes:
    计算相同电弧能量下不同弯曲角度的折线形端头部在第一连接点处的最大应力值，获得弯曲角度与第一连接点处的最大应力值的关系图，所述第一连接点为所述折线形端头部的折线部与电缆穿设部的连接点；Calculate the maximum stress value at the first connection point of the broken-line end head with different bending angles under the same arc energy, and obtain the relationship diagram between the bending angle and the maximum stress value at the first connection point. The connection point between the broken line part of the broken line-shaped end head and the cable insertion part;
    对弯曲角度与第一连接点处的最大应力值的关系图进行数据拟合，得 到弯曲角度与第一连接点处的最大应力值的函数关系式；Data fitting is performed on the relationship graph between the bending angle and the maximum stress value at the first connection point, and the functional relationship between the bending angle and the maximum stress value at the first connection point is obtained;
    对所述函数关系式进行求导，将导数最小值对应的弯曲角度记为最优弯曲角度。Derivation of the functional relationship is performed, and the bending angle corresponding to the minimum value of the derivative is recorded as the optimal bending angle.
  6. 根据权利要求4所述的高压电缆接头金属防爆装置端头部参数的确定方法，其特征在于，确定防爆装置内壁承受应力分布最均衡的法兰尺寸的具体方法包括：The method for determining the head parameters of the metal explosion-proof device of the high-voltage cable joint according to claim 4, wherein the specific method for determining the flange size with the most balanced stress distribution on the inner wall of the explosion-proof device includes:
    仿真计算法兰厚度为15-20mm，法兰宽度为40-50mm时，第二连接点处的应力值和防爆装置内壁承受的平均应力值，所述第二连接点为所述折线形端头部的折线部与端头法兰的连接点；When the flange thickness is 15-20mm and the flange width is 40-50mm, the stress value at the second connection point and the average stress value borne by the inner wall of the explosion-proof device are calculated by simulation, and the second connection point is the broken line end The connection point between the broken line part of the part and the end flange;
    根据应力畸变系数最小值对应的法兰厚度和法兰宽度确定最优法兰尺寸，所述应力畸变系数为第二连接点处的应力值与防爆装置内壁承受的平均应力值的比值。The optimal flange size is determined according to the flange thickness and flange width corresponding to the minimum stress distortion coefficient, the stress distortion coefficient being the ratio of the stress value at the second connection point to the average stress value borne by the inner wall of the explosion-proof device.
  7. 根据权利要求6所述的高压电缆接头金属防爆装置端头部参数的确定方法，其特征在于，最优法兰尺寸对应的第二连接点在模拟爆炸能量下的应力值小于折线形端头部的材料断裂应力，所述模拟爆炸能量为实际电缆接头发生爆炸时产生的能量。The method for determining the parameters of the end head of the metal explosion-proof device of the high-voltage cable joint according to claim 6, wherein the stress value of the second connection point corresponding to the optimal flange size under the simulated explosion energy is smaller than the broken line end head The material fracture stress of, the simulated explosion energy is the energy generated when the actual cable joint explodes.
  8. 根据权利要求6所述的高压电缆接头金属防爆装置端头部参数的确定方法，其特征在于，最优法兰尺寸对应的应力畸变系数小于2。The method for determining the head parameters of the metal explosion-proof device of the high-voltage cable joint according to claim 6, wherein the stress distortion coefficient corresponding to the optimal flange size is less than 2.
  9. 一种高压电缆接头金属防爆装置端头部参数的确定系统，其特征在于，所述系统用于权利要求1-3任一项所述的防爆装置，所述系统包括：A system for determining end head parameters of a metal explosion-proof device for high-voltage cable joints, wherein the system is used for the explosion-proof device according to any one of claims 1 to 3, and the system comprises:
    腔体应力计算模块，用于利用电场、温度场、流场和位移场耦合的有限元计算方法，基于三层迭代算法得到不同时刻、不同端部结构的金属防爆腔体内部承受的应力值；Cavity stress calculation module, used to use the finite element calculation method of electric field, temperature field, flow field and displacement field coupling, based on the three-layer iterative algorithm to obtain the stress value of the metal explosion-proof cavity at different times and different end structures;
    连接点最大应力计算模块，用于计算不同弯曲角度和不同法兰尺寸下防爆装置内壁承受的应力，得出折线形端头部和中间壳体各连接点的最大应力值，所述法兰尺寸包括壳体法兰厚度、壳体法兰宽度、端头法兰厚度和端头法兰宽度；The maximum stress calculation module of the connection point is used to calculate the stress on the inner wall of the explosion-proof device under different bending angles and different flange sizes, and obtain the maximum stress value of each connection point of the broken-line end head and the middle shell. The flange size Including shell flange thickness, shell flange width, end flange thickness and end flange width;
    参数确定模块，用于根据不同弯曲角度和不同法兰尺寸下各连接点的最大应力值确定防爆装置内壁承受应力分布最均衡的折线形端头部的弯曲角度和法兰尺寸。The parameter determination module is used to determine the bending angle and flange size of the broken line end head of the explosion-proof device inner wall with the most balanced stress distribution according to the maximum stress value of each connection point under different bending angles and different flange sizes.
PCT/CN2020/095788 2019-06-14 2020-06-12 Metal explosion-proof device for high-voltage cable joint, and end part parameter determination method and system WO2020249077A1 (en)

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