CN110867810A - A high-voltage line compressed air impact deicing device - Google Patents

Abstract

The utility model provides a high-voltage line compressed air strikes defroster, belongs to high-voltage line protection equipment technical field, can solve current deicing method deicing speed slow, and efficiency is not high, exists danger, problem with high costs, including air compressor, the insulating high pressure resistant gas tube of one end confined, a plurality of storages and the insulating card that are used for saving compressed air, the one end of storage is equipped with the air inlet, and the other end is equipped with the rupture disk of non-metallic material, and the open end of gas tube is connected with air compressor's gas outlet, and the air inlet of storage is connected with the lateral wall of gas tube, and the other end that is equipped with the rupture disk of storage is located the high-voltage line directly over, and the one end and the gas tube of insulating card are connected, and. The invention can remove the ice coated on the high-voltage wire quickly and efficiently by deicing the high-pressure gas stored in the compressed air storage.

Description

A high-voltage line compressed air impact deicing device

technical field

The invention belongs to the technical field of high-voltage line protection equipment, and particularly relates to a high-voltage line compressed air impact deicing device.

Background technique

In recent years, with the frequent occurrence of extreme weather, high-voltage lines are often plagued by icing. Severe icing causes towers to tilt, collapse, disconnect, and insulator flashovers, resulting in line trips, power interruptions, and other accidents. causing great inconvenience to people's lives. For this reason, many scholars at home and abroad have carried out in-depth research on the icing phenomenon of high-voltage lines, and proposed a variety of deicing methods. However, the high-voltage line deicing equipment in the prior art has the following defects:

1. During the process of deicing, the equipment removes the ice cubes on the high-voltage line by hitting and rolling with the mobile manipulator. Such methods have slow deicing speed and low efficiency. The high-voltage line cannot be de-iced in time, which may cause the high-voltage line to break. Wire.

2. If explosive shock wave is used for deicing, under the condition of high voltage of several million volts, the operational safety, detonation reliability and false explosion rate of explosives need to be verified, which may cause injury and damage to operators and equipment.

3. In addition, in the process of deicing with explosive shock wave, the device cannot be reused, resulting in a large consumption of materials and high cost.

The bursting disc device consists of a bursting disc and a holder. The bursting disc is a component that can quickly burst under the calibrated drying pressure and design drying temperature to relieve pressure. The holder has a designed discharge port diameter, which can ensure that the edge of the drying disc is firmly clamped and sealed. And a pair of matching parts that can make the rupture disc obtain accurate drying pressure.

The bursting discs are in the form of metal flat plate type, common positive arch type, slotted positive arch type and reverse arch type bursting disc and graphite bursting disc.

The flat-plate bursting disc is made of plastic metal or graphite, and is a thin flat plate that is clamped by a flange or directly bolted to the short tube flange of the container. According to the basic form of the force and deformation of the blasting element when it breaks, it can be divided into tensile failure type, shear failure type and bending failure type. The blasting elements of the tensile failure type and the bending failure type are generally made into circular sheets of equal thickness, while the shear failure type blasting elements are made into circular sheets with a thick middle and a thin edge, so that they are sheared at the edge and broken. .

This type of bursting disc has a simple structure and is easy to install, but the anti-fatigue performance of the bursting element is poor, and is generally only used in situations where the operating pressure is stable and the pressure is not high.

The arched metal blasting element is hydraulically processed into a convex sheet, the holder is clamped with a countersunk head screw, and then mounted on the flange of the mouthpiece of the container, as shown in the figure. Larger diameter, less stringent requirements. The blasting element can be clamped directly by the flange of the nozzle. However, its installation is difficult, and it is easy to install and slip off under a small operating pressure. According to the form of rupture, arched metal rupture discs can be divided into two types: tension type and compression type. For tensile rupture discs, the concave surface of its blasting element is on the high pressure side during action, and the element is compressed due to the rupture of the plastic tensile surface during blasting, and the convex surface of its blasting element is on the high pressure side during action. The element is overturned and broken or falls off due to elastic compression instability. Therefore, the compression type rupture disc is divided into the compression rupture type and the compression detachment type. The former is blasted due to instability and flips over to touch the blade (or frontal teeth) or due to groove cracking and the latter falls off due to instability and overturning.

Ordinary positive arch rupture disc is tensile failure type, which is made of single-layer plastic metal material. The concave side of the sheet faces the media, causing tensile failure when loaded.

The slotted positive arch bursting disc is also a tensile failure type, which is composed of two ordinary positive arched blasting elements with the same curvature. The concave side of the sheet faces the medium. One of the composite sheets that is in contact with the medium is made of metal or non-metallic materials, and the other sheet is made of metal materials and has a number of penetrating slots in the arched part. After the composite sheet is loaded cause tensile failure.

The reverse arch rupture disc is a compression failure type, which is made of a single-layer plastic metal material. The convex side of the sheet faces the medium, causing buckling failure after being loaded.

The error between the design drying pressure and the actual bursting pressure (measured by the test) of the arched bursting disc is smaller than that of the flat type, and it has higher fatigue resistance and can be used in high pressure or ultra-high pressure applications. However, its structure is more complicated than that of the flat type, the manufacturing cost is high, and the installation is not very convenient.

SUMMARY OF THE INVENTION

The invention aims at removing the ice cubes on the high-voltage line by means of striking and rolling by the mobile manipulator during the deicing process of the existing high-voltage line deicing equipment. Such methods have slow deicing speed and low efficiency, and cannot deic the high-voltage line in time. It may cause disconnection of the high-voltage line; and the use of explosive shock waves for deicing. Under the high voltage of several million volts, the operation safety, detonation reliability and false explosion rate of explosives need to be verified, which may cause injury and damage to operators and equipment. ; The device cannot be reused, which leads to the problem of massive consumption of materials and high cost. A high-voltage line compressed air impact deicing device is provided.

The present invention adopts following technical scheme:

A high-voltage line compressed air impact deicing device, comprising an air compressor, an insulating high-pressure-resistant inflatable tube closed at one end, a plurality of storages for storing compressed air, and an insulating card, wherein one end of the storage is provided with an air inlet, and the other end is provided with an air inlet. A bursting disc made of non-metallic material is provided, the open end of the charging pipe is connected to the air outlet of the air compressor, the air inlet of the accumulator is connected to the side wall of the charging pipe, and the other end of the accumulator with the bursting disc is located directly above the high-voltage line , one end of the insulating card is connected with the gas tube, and the other end is connected with the high-voltage line.

The section of one end of the accumulator provided with the bursting disc is tapered.

The memories are arranged at equal intervals.

The insulating cards and the memories are alternately arranged.

The beneficial effects of the present invention are as follows:

1. The present invention can remove the ice on the high-voltage line quickly and efficiently by deicing the high-pressure gas stored in the compressed air storage.

2. The present invention replaces the explosive to generate high-pressure gas by inflating the air compressor, which can effectively prevent the safety problem caused by the explosive being affected by the high pressure.

3. The present invention can realize the repeated use of the device by replacing the rupture disc, which greatly saves the cost of materials and labor required for installation.

4. The present invention can control the impact force of the compressed air by replacing the bursting discs of different materials, and for the ice covering of different thicknesses, the pressure can just meet the requirements of deicing, and the impact of excessive pressure on the wires can be minimized.

Description of drawings

Fig. 1 is the structural representation of the present invention;

Fig. 2 is the structural representation of the memory of the present invention;

Among them: 1-air compressor; 2-inflatable pipe; 3-memory; 4-insulation card; 5-high voltage line; 6-air inlet; 7-bursting disc.

Detailed ways

The present invention will be further described with reference to the accompanying drawings.

As shown in the figure, a high-voltage line compressed air impact deicing device includes an air compressor 1, an insulating and high-pressure-resistant inflation tube 2 closed at one end, a number of storages 3 for storing compressed air, and an insulating card 4. The storage 3 One end is provided with an air inlet 6, the other end is provided with a non-metallic bursting disc 7, the open end of the charging pipe 2 is connected with the air outlet of the air compressor 1, the air inlet 6 of the storage 3 is connected to the side of the charging pipe 2 The other end of the storage 3 with the bursting disc 7 is directly above the high-voltage line 5 , one end of the insulating card 4 is connected to the gas tube 2 , and the other end is connected to the high-voltage line 5 .

The cross section of one end of the storage device 3 provided with the bursting disc 7 is tapered.

The memories 3 are arranged at equal intervals.

The insulating cards 4 are alternately arranged with the memories 3 .

The inflatable tube 2 is made of light-weight, pressure-resistant and insulating materials. The bursting disc 7 of the storage device 3 is made of non-metallic sheet (membrane) material, which can prevent safety accidents caused by flying pieces caused by blasting. The storage 3 can be installed with different types of bursting discs to control the size of the impact gas pressure, and the ice covering with different thicknesses can be blasted and removed with the most appropriate pressure air as much as possible.

The insulating card 4 fixes the gas tube 2 and the storage 3 directly above the high-voltage line 5, so that the high-pressure gas impacts the ice coating on the high-voltage line directly below at the most suitable distance.

The working process of the present invention is as follows:

The air compressor 1 fills the accumulator 3 with gas through the charging pipe 2 to control the pressure in the accumulator 3. When the internal pressure of the accumulator 3 reaches the critical pressure resistance value of the rupture disc 7, the accumulator 3 is blasted right above the high-voltage line 5, and the high pressure stored in the accumulator 3 is blasted. The gas hits the ice and causes it to fall off.

Among them, the calculation of the bursting disc is as follows:

1. Discharge area of rupture disc

The bursting disc should have enough discharge area to ensure that the pressure in the container can be released in time when the diaphragm ruptures, so as to prevent the container from continuing to pressurize and explode. For the medium in the container, the discharge area of the rupture disc should be greater than or equal to the value calculated by the following formula.

，其中：A-爆破片的排放面积，m²；G´-容器的安全泄放量，kg/h；C-流量系数，对一般直圆管C=0.71；与容器连接侧装爆破片的接口管具有喇叭型检索扣，则C=0.87；P-爆破片的设计爆破压力，Pa；X-气体的特性系数；M-容器内气体的分子量；T-容器内气体的绝对温度，K；Z-气体压缩系数。

, where: A - the discharge area of the bursting disc, m ² ; G´ - the safe discharge amount of the container, kg/h; C - the flow coefficient, C=0.71 for a general straight pipe; the interface connecting the side-mounted bursting disc with the container If the tube has a flared retrieval button, then C=0.87; P-design burst pressure of rupture disc, Pa; X-characteristic coefficient of gas; M-molecular weight of gas in container; T-absolute temperature of gas in container, K; Z - Gas compressibility.

The values of the gas characteristic coefficient X for different K values (gas adiabatic index) are as follows.

2. Thickness of rupture disc

，

,

Among them: S - the initial thickness of the bursting disc, P _b - the bursting pressure determined during the design of the bursting disc; σ ^t _b - the strength limit of the material at the working temperature; D - the clamping diameter of the bursting disc.

Claims (4)

1. The utility model provides a deicer is strikeed to high-voltage line compressed air which characterized in that: including air compressor (1), the insulating high pressure resistant gas tube (2) of one end confined, a plurality of memory (3) and the insulating card (4) that are used for storing compressed air, the one end of memory (3) is equipped with air inlet (6), and the other end is equipped with rupture disk (7) of non-metallic material, and the open end of gas tube (2) is connected with the gas outlet of air compressor (1), and air inlet (6) and the lateral wall of gas tube (2) of memory (3) are connected, and the other end that is equipped with rupture disk (7) of memory (3) is located high-voltage line (5) directly over, and the one end and gas tube (2) of insulating card (4) are connected, and the other end is connected with high-voltage line (5).

2. A high-voltage line compressed air impact deicing apparatus as set forth in claim 1, wherein: the cross section of one end of the storage (3) provided with the rupture disk (7) is conical.

3. A high-voltage line compressed air impact deicing apparatus as set forth in claim 1, wherein: the memories (3) are arranged at equal intervals.

4. A high-voltage line compressed air impact deicing apparatus as set forth in claim 1, wherein: the insulation cards (4) and the memories (3) are alternately arranged.

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