CN113783136A

CN113783136A - Partition plate flange for gas insulated high-voltage electric appliance and processing method thereof

Info

Publication number: CN113783136A
Application number: CN202111170444.6A
Authority: CN
Inventors: 陈晓凌; 陈晓鸣; 刘明矿; 李松恩
Original assignee: Jiangsu Ankura Smart Transmission Engineering Technology Co ltd
Current assignee: Jiangsu Ankura Smart Transmission Engineering Technology Co ltd
Priority date: 2021-10-08
Filing date: 2021-10-08
Publication date: 2021-12-10

Abstract

The application provides a partition plate flange for a gas insulated high-voltage electrical apparatus and a processing method thereof. According to the method, the annular groove is machined in the inner periphery of the partition plate flange by using the boring cutter, and the bottom of the inner periphery of the annular groove is cut into the plurality of circumferential limiting grooves by further using the common disc-shaped cutter. Therefore, the baffle flange with the smaller size can be directly machined by the disc-shaped cutter with the diameter not exceeding the inner periphery of the baffle flange, and the limit on the cutter for machining the baffle flange is reduced. In addition, the insulating medium and the central insert can be directly limited to rotate inside the partition flange through the circumferential limiting groove, and the insulating medium and the central insert are limited to move back and forth along the axial direction of the partition flange through the annular groove, so that the insulating and isolating effect of the central insert can be effectively guaranteed, and the stable operation of a high-voltage element in the gas-insulated high-voltage electrical appliance can be guaranteed.

Description

Partition plate flange for gas insulated high-voltage electric appliance and processing method thereof

Technical Field

The application relates to the field of high-voltage electrical equipment, in particular to a partition plate flange for a gas-insulated high-voltage electrical apparatus and a processing method thereof.

Background

The high voltage components of a gas insulated high voltage electrical apparatus need to be supported inside the housing by a partition in a manner similar to that shown in fig. 1. The partition is made of an insulating material, and has an outer edge in contact with the housing and a middle portion in contact with the high-voltage element. Generally, to ensure the insulation performance, the relative displacement between the housing and the high voltage component should be as small as possible. The positional relationship among the high voltage conductor, the housing and the partition is shown in fig. 1.

The separator generally consists of three parts: the baffle plate comprises a central insert positioned in the baffle plate, an insulating medium surrounding the periphery of the central insert and a baffle plate flange fixedly supported on the periphery of the insulating medium. The central insert and the partition flange are usually made of metal, and the main component of the insulating medium is an epoxy resin material. The three components are cast and molded to form a whole. Because the epoxy resin has certain contractibility in the process of casting molding, the molded epoxy resin can be bonded with the central insert, a small gap can be generated between an insulating medium of the epoxy resin and the inner surface of the partition plate flange due to material contraction, the small gap can cause the freedom degree of relative movement between the epoxy resin and the flange, and the relative position relation between the shell and the central insert is influenced.

In order to limit the radial or axial relative movement of the insulating medium of the epoxy resin relative to the flange, an annular groove is usually designed in the middle of an inner ring of a partition plate flange in the prior art, and the annular groove is used for realizing the clamping connection with the insulating medium; in order to limit the degree of freedom of the epoxy resin insulation medium rotating along the circumference of the flange, in the prior art, a plurality of rectangular grooves are further formed in the bottom of the annular groove through a milling cutter, and the periphery of the insulation medium is clamped and fixed through the rectangular grooves. Therefore, after casting molding, the annular groove and the rectangular groove at the bottom of the annular groove are filled with epoxy resin to form the annular bulge and the rectangular bulges which are structurally matched with the annular bulge and the rectangular bulges. The grooves on the inner side of the partition plate flange are matched with the protrusions on the outer side of the epoxy resin insulating medium, so that the epoxy resin and the flange are limited to generate small-sized relative displacement and rotation.

In the prior art, when machining each groove inside a partition flange, the common steps are as follows:

firstly, the annular groove is processed and formed along the axial direction by using a boring cutter, then a milling cutter and a cutter holder thereof extend into the flange, and a rectangular groove is further processed and formed at the bottom of the annular groove along the radial direction.

However, for the partition board with a smaller flange diameter, the common milling cutter and the clamp thereof cannot enter the flange to perform rectangular groove processing. Thus, the existing rectangular groove design increases the difficulty of manufacturing and machining and requires the use of more elaborate and miniaturized milling cutter heads.

Disclosure of Invention

The utility model provides a to prior art's not enough, provides a baffle flange for gas insulation high-voltage electricity ware and processing method thereof, and this application utilizes the disc cutter to form the circumference spacing groove in the annular groove bottom direct cutting of baffle flange internal week, and it is spacing to provide circumference through this circumference spacing groove, simplifies baffle flange processing technology, reduces the dimensional requirement of small-size baffle flange to the processing tool bit. The technical scheme is specifically adopted in the application.

First, in order to achieve the above object, there is provided a diaphragm flange for a gas insulated high voltage electric machine, comprising: an annular groove provided in the middle of the inner peripheral surface of the separator flange; the circumferential limiting groove is arranged on the inner periphery of the partition plate flange, and the inner part of the circumferential limiting groove is arc-shaped; the circumferential limiting groove is formed in the bottom of the annular groove.

Optionally, the partition flange for a gas insulated high-voltage electrical apparatus as described above, wherein the annular grooves are formed by recessing an inner circumferential surface of the partition flange and are distributed annularly along a circumferential direction of the inner circumferential surface.

Optionally, the partition flange for a gas insulated high-voltage electrical apparatus as described above, wherein the circumferential limiting groove is formed by an inward recess in the bottom of the annular groove and is distributed at intervals in the bottom of the annular groove.

Optionally, the partition flange for a gas insulated high-voltage electrical apparatus as described above, wherein a radius of the circumferential limiting groove is smaller than a radius of the annular groove.

Optionally, the partition flange for a gas insulated high-voltage electrical apparatus as described above, wherein the circumferential limiting groove is formed by directly cutting a disc-shaped cutter extending into the annular groove.

Optionally, the separator flange for a gas insulated high-voltage electrical apparatus as described above, wherein an insulating medium and a central insert are connected to an inside of the separator flange, wherein a peripheral edge of the insulating medium is respectively and simultaneously embedded into the annular groove and the circumferential limiting groove, and the central insert is fixed to the internal connecting insulating medium.

Meanwhile, in order to achieve the above object, the present application also provides a method for processing a spacer flange for a gas insulated high voltage device, comprising the steps of: the boring cutter extends into the partition plate flange, and is driven to process and open an annular groove along the inner circumferential surface of the partition plate flange; and (3) extending the disc-shaped cutter into the annular groove, and cutting at intervals along the bottom of the annular groove to form a plurality of circumferential limiting grooves.

Optionally, in the processing method described in any of the above, when the circumferential limiting groove is processed, the disk-shaped cutter rotates circumferentially to cut the bottom of the inner circumference of the annular groove, and moves radially from inside to outside along the inner circumference of the annular groove, and the arc-shaped inner wall of the circumferential limiting groove is formed at the bottom of the cutting annular groove.

Optionally, the machining method according to any one of the above, wherein the cutting radius of the disc cutter is smaller than the radius of the annular groove.

Optionally, in the processing method described above, when the annular groove is processed, the partition flange rotates circumferentially, the boring cutter moves radially from inside to outside along the inner circumference of the partition flange, cuts the middle portion of the inner circumferential surface of the partition flange, and forms the annular grooves distributed annularly along the circumferential direction of the inner circumferential surface.

Advantageous effects

According to the method, the annular groove is machined in the inner periphery of the partition plate flange by using the boring cutter, and the bottom of the inner periphery of the annular groove is cut into a plurality of circumferential limiting grooves serving as circumferential limiting grooves by further using a common disc-shaped cutter. Therefore, the baffle flange with the smaller size can be directly machined by the disc-shaped cutter with the diameter not exceeding the inner periphery of the baffle flange, and the limit on the cutter for machining the baffle flange is reduced. In addition, the insulating medium and the central insert can be directly limited to rotate inside the partition flange through the circumferential limiting groove, and the insulating medium and the central insert are limited to move back and forth along the axial direction of the partition flange through the annular groove, so that the insulating and isolating effect of the central insert can be effectively guaranteed, and the stable operation of a high-voltage element in the gas-insulated high-voltage electrical appliance can be guaranteed.

According to the cutter, the disk-shaped cutter rotates, and the circumferential limiting groove matched with the edge shape of the cutter head is directly cut at the bottom of the annular groove. Therefore, in the process of pouring the insulating medium, the outer edge of the insulating medium can enter the circumferential limiting groove formed in the bottom of the insulating medium through the annular groove to form an arc-shaped edge protruding structure attached to the circumferential limiting groove, and clamping is achieved. After the forming, the front side and the rear side of the annular groove surround the outer edge of the insulating medium to limit the insulating medium to move back and forth along the axial direction of the partition plate flange, and the arc-shaped transition surface formed between the circumferential limiting groove and the bottom of the annular groove can abut against the arc-shaped edge protruding structure on the peripheral edge of the insulating medium when the insulating medium rotates relative to the partition plate flange to limit the insulating medium to rotate relative to the partition plate flange. Therefore, the baffle plate flange is stably connected between the connecting end surfaces of the front shell and the rear shell 3 through the fixed connecting parts such as screws, bolts and the like, so that the center insert in the shell can be fixed, and the front and rear movement or the left and right rotation of the center insert relative to the high-pressure element in the shell is effectively limited.

Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application.

Drawings

The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application and not limit the application. In the drawings:

FIG. 1 is a schematic view of a flange for a gas insulated high voltage device and a connection method between the flange and a high voltage device

FIG. 2 is a schematic view of a conventional separator flange for a gas insulated high voltage apparatus;

FIG. 3 is a schematic view of a separator flange for a gas insulated high voltage electrical apparatus according to the present application;

fig. 4 is a schematic view of an insulation basin structure formed by a diaphragm flange for a gas insulated high voltage device according to the present application.

In the drawings, 1 denotes a separator; 2 denotes a high voltage element; 3 represents a housing; 11 denotes a bulkhead flange; 12 denotes an insulating medium; 13 denotes a central insert; 101 denotes an annular groove; 102 denotes a rectangular groove; 4, a milling cutter; 5 a disc cutter; and 112, a circumferential stopper groove.

Detailed Description

In order to make the purpose and technical solutions of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings of the embodiments of the present application. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the application without any inventive step, are within the scope of protection of the application.

It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

The meaning of "and/or" as used herein is intended to include both the individual components or both.

The meaning of "inside and outside" in the application means that the direction pointing to the central insert arranged inside the partition plate flange is inside, and vice versa, relative to the partition plate flange per se; and not as a specific limitation on the mechanism of the device of the present application.

The meaning of "front and back" in this application means that when the user is facing the direction of the recess of the insulating medium, the direction close to the user is front, and the direction close to the central insert at the bottom of the insulating medium is back, not the specific limitation of the mechanism of the device of this application.

The term "connected" as used herein may mean either a direct connection between components or an indirect connection between components via other components.

The terms "up, down, left, and right" as used herein refer to the user's top being up, the user's bottom being down, the user's left being left, the user's right being right, when the user is facing the direction of the depression of the insulating medium, rather than the specific limitations on the mechanism of the device of the present application.

The application provides a baffle flange 11 for gas-insulated high-voltage electrical apparatus, it is with the mode of fig. 1, set up between the connection terminal surface of two shells 3 in the front and back, an insulating medium 12 for connecting shell internal fixation center inserts 13, the connection terminal surface of cooperation shell restricts insulating medium jointly and removes, thereby guarantee to be connected steadily between center inserts 13 and the high voltage component 2, guarantee the insulating isolation effect of insulating medium to center inserts, guarantee that the high voltage component can the steady operation in the gas-insulated high-voltage electrical apparatus.

Referring to fig. 4, the spacer flange 11 provided in the present application may be integrally formed with the insulating medium by casting. The insulating medium 12 is shaped by a casting mold and forms a basin body which is sunken backwards, and a central insert 13 is embedded in the bottom formed by the basin body. Therefore, the insulating medium is fixedly connected between the partition flange and the central insert to form a complete partition structure. The partition plate structure is fixedly connected with a flange connecting part arranged on the end surface of the shell 3 through a partition plate flange on the periphery, and the central insert is limited in a cavity formed between the front shell and the rear shell, so that the central insert can be respectively and electrically connected with the front high-voltage element and the rear high-voltage element in the shells through the front end surface and the rear end surface of the central insert to form an electric path between the high-voltage elements, and the effective transmission of a high-voltage electric signal is realized in a gas insulation environment formed by sealing the shells. The insulating medium can provide insulating isolation protection for the high-voltage element, and the reliable operation of the whole gas-insulated high-voltage electrical appliance is guaranteed.

Since the insulating medium such as epoxy resin has a certain shrinkage property during the casting molding process, the molded epoxy resin can be completely and firmly bonded with the central insert, but the epoxy resin on the periphery of the separator and the inner surface of the flange of the separator usually generate a tiny gap due to material shrinkage.

In order to limit the freedom degree of relative movement between the insulating medium and the flange partition plate caused by the tiny gap as much as possible and avoid the influence on the insulating performance of a high-voltage element in the shell due to the fact that the insulating medium moves back and forth or rotates relative to the partition plate flange, therefore, the boring cutter can extend into the inner periphery of the partition plate flange firstly, the partition plate flange is driven to rotate circumferentially, the boring cutter is arranged to move from inside to outside along the radial direction of the inner periphery of the partition plate flange, the middle part of the inner periphery of the partition plate flange is cut, annular grooves distributed annularly along the circumferential direction of the inner periphery are machined, and the front side wall and the rear side wall of each annular groove are abutted against the front end face and the rear end face of the insulating medium to limit the axial direction of the insulating medium through the annular grooves formed by the inner periphery of the partition plate flange; then, the disc-shaped cutter can further extend into the annular groove from the center of the partition plate flange, a plurality of circumferential limiting grooves are formed in the inner circumference of the partition plate flange along the bottom of the annular groove in a cutting mode at intervals, and the outer edges of the insulating medium are clamped by the circumferential limiting grooves which are formed by the inner recess of the bottom of the annular groove 101 and are distributed at the bottom of the annular groove at intervals and provided with arc-shaped bottom surfaces, so that the circumferential rotation of the insulating medium is limited.

The disc-shaped cutter 5 can directly drive the cutter head to rotate through the motor shaft, so that the cutting operation of a workpiece is realized, a large stroke space does not need to be reserved, and the cutter head can reciprocate up and down, so that the cutter head structure can be only provided with two main parts, namely a cutter head body and a motor shaft connecting and fixing part. The disc cutter can ensure that the diameter of the cutter head is matched with the inner diameter of the partition plate flange by replacing the cutter head, so that circumferential limiting grooves (112) with different radian sizes are formed in the bottom of the inner circumference of the circumferential limiting groove in partition plate flanges with different sizes to serve as the circumferential limiting grooves, and circumferential clamping and fixing of insulating media are realized.

Therefore, the present application can directly utilize the existing disc cutter with a smaller structure to at least achieve the cutting processing of the inner periphery of the partition plate flange with the inner diameter of about 100mm by selecting the cutter disc size of the disc cutter and limiting the cutting radius of the disc cutter to be smaller than the radius of the annular groove, and the processing size is far smaller than the processing diameter requirement of the milling cutter 4 shown in the prior figure 2 to be not less than 300 mm. This cutter approach places less restrictions on the size of the cutter head than the existing approach of machining by milling cutters, and therefore allows similar cutting effects to the entry mini-mill cutter head to be achieved by simply selecting the smaller size of the existing disc cutter. The bottom surface of the arc-shaped groove is smoothly transited to the bottom surface of the annular groove, but a certain included angle is formed at the connecting position of the edges of the two grooves, so that the arc-shaped groove can still utilize the bottom depth and the edge included angle of the arc-shaped groove to realize limiting clamping on an arc-shaped edge protruding structure of the insulating medium, the arc-shaped groove is abutted against the arc-shaped edge protruding structure of the insulating medium, the limitation on the peripheral rotating direction of the insulating medium is realized, and the same positioning effect as the rectangular groove 102 is realized.

In order to ensure that the whole stress of the insulating medium is uniform, the rotation and the deviation of the insulating medium in all directions can be effectively limited by the groove structure, and therefore, the arc grooves can be further uniformly distributed along the inner circumference bottom of the annular groove. Therefore, once the insulating medium is subjected to relative displacement or relative rotation, the stress on the periphery of the insulating medium is uniform in all directions, and the insulating medium can be effectively prevented from being deformed or damaged due to the fact that the insulating medium bears overlarge stress in a single direction.

Referring to the left side of FIG. 3, the radius of the arcuate groove 112 formed by cutting may generally be limited to less than the radius of the annular groove by selecting a smaller sized disc cutter. Therefore, the included angle formed by the connecting positions of the edges of the two grooves can be increased, and the limiting effect on the insulating medium is enhanced.

Furthermore, the disc-shaped cutter with a thinner cutting part can be further selected to limit the thickness of the cutting operation surface, namely the cutting width of the disc-shaped cutter does not exceed the thickness of the annular groove, so as to further limit the width of the arc-shaped groove in the front-back direction to not exceed the axial thickness of the annular groove, and further form included angles connected to the bottom surface of the annular groove at the front side edge and the rear side edge of the arc-shaped groove. Therefore, the application can further provide the limitation on the front and rear axial displacement of the insulating medium through the included angles between the front and rear end surfaces of the arc-shaped groove and the bottom surface of the annular groove. In the cutting process, the disk-shaped cutter 5 rotates circumferentially to cut the bottom of the inner periphery of the annular groove 101, and simultaneously moves radially from inside to outside along the bottom of the annular groove 101 to form the arc-shaped bottom inner wall of the circumferential limiting groove 112.

For avoiding the arc recess to set up too deeply and influence baffle flange structural strength, consequently, the depth of cut that generally sets up the arc recess in this application does not exceed the fluting degree of annular groove. That is, the depth of the deepest position of the upper end and the lower end of the partition plate flange on the left side in fig. 3 is generally not more than 2 times of the original groove depth of the annular groove, and the flange disc structures with enough thickness are reserved on the outer sides of the annular groove and the arc-shaped groove, so that the connection strength between the flange disc structures and the front end face and the rear end face of the shell can be ensured, and the limiting strength of the internal insulating medium is ensured.

In general, the specific opening position of the arc-shaped groove can be arbitrarily selected on the bottom surface of the annular groove. However, in consideration of the stress state of the insulating medium, in order to keep the stress balance of the insulating medium inside the partition plate flange as much as possible and avoid the tendency of axial deflection of the insulating medium relative to the partition plate flange caused by unbalanced external stress, in a preferred implementation, the arc-shaped grooves may be symmetrically arranged at 4 symmetrical positions on the upper, lower, left and right of the inner circumference of the annular groove in the manner of fig. 3, and the arc-shaped grooves are arranged and all located in the same radial plane. Therefore, stress borne by the shell 3 or the central insert can be uniformly applied to the partition plate flange and the insulating medium through the two groups of completely symmetrical grooves, so that the connection limiting structure is guaranteed to be uniformly stressed as much as possible, and deflection caused by unbalanced stress is avoided.

In conclusion, this application passes through inside two sets of groove structure of baffle flange and connects insulating medium to fix central inserts through insulating medium. This application accessible pouring mode sets up the peripheral edge embedding of insulating medium in the annular groove and the arc recess that the baffle flange inner periphery formed, and restriction insulating medium and inside fixed central inserts that bonds follow baffle flange circumferential direction or move along baffle flange axial. The annular groove and the arc-shaped groove are simple in structure and easy to machine and manufacture, and the machining requirements of the flange with the smaller partition plate in diameter can be met by the common machining machine tool and the existing disc-shaped cutter.

This application sets up annular groove at baffle flange internal periphery to bottom cutting at annular groove forms the arc recess, sets up central inserts in baffle flange inboard, sets up this central inserts and assembles in the flange inboard before the pouring of baffle insulating medium, inside embedding insulating medium after the pouring of insulating medium, thereby realize fixing between flange and the insulating medium, form the basin formula insulator or the metal ring flange basin formula insulator that are used for gas insulation high-voltage apparatus.

This application adopts the disk cutter to replace milling cutter and the supporting anchor clamps of milling cutter to stretch into inside the baffle flange and process, can be suitable for and process the flange structure of smaller size. The application provides a flange diameter range that baffle flange structure is suitable for is wide, and the manufacturing condition who is suitable for is not high, and ordinary lathe can satisfy the manufacturing requirement.

The above are merely embodiments of the present application, and the description is specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the protection scope of the present application.

Claims

1. A diaphragm flange for a gas insulated high voltage electric machine, comprising:

an annular groove (101) provided in the middle of the inner peripheral surface of the separator flange;

the circumferential limiting groove (112) is arranged on the inner circumference of the partition plate flange, and the inner part of the circumferential limiting groove (112) is arc-shaped;

the circumferential limiting groove (112) is formed in the bottom of the annular groove (101).

2. The spacer flange for a gas insulated high voltage electric device according to claim 1, wherein the annular grooves (101) are formed by recessing an inner circumferential surface of the spacer flange and are distributed annularly along a circumferential direction of the inner circumferential surface.

3. The diaphragm flange for a gas insulated high voltage electric machine according to claim 1, wherein the circumferential direction limiting grooves (112) are formed by recessing the bottom of the annular groove (101) and are spaced apart from each other at the bottom of the annular groove.

4. The diaphragm flange for a gas insulated high voltage electric machine according to claim 3, wherein the radius of the circumferential stopper groove (112) is smaller than the radius of the annular groove (101).

5. A partition flange for a gas insulated high-voltage electric appliance according to any one of claims 1 to 5, characterized in that said circumferential limiting groove (112) is formed by direct cutting of a disc cutter (5) extending into the annular groove (101).

6. The separator flange for gas-insulated high-voltage electrical apparatuses according to claim 7, wherein the inside of the separator flange is connected to an insulating medium (12) and a central insert (13), wherein the outer peripheral edge of the insulating medium (12) is simultaneously fitted into the annular groove (101) and the circumferential limiting groove (112), respectively, and the central insert (13) is fixed to the inside of the connecting insulating medium (12).

7. A processing method of a partition plate flange for a gas insulated high-voltage electrical apparatus is characterized by comprising the following steps:

the boring cutter extends into the partition plate flange, and is driven to process and open an annular groove (101) along the inner circumferential surface of the partition plate flange;

the disc-shaped cutter (5) extends into the annular groove (101), and a plurality of circumferential limiting grooves (112) are formed at intervals along the bottom of the annular groove (101).

8. The machining method according to claim 7, wherein when the circumferential limiting groove (112) is machined, the disk-shaped cutter (5) rotates circumferentially to cut the bottom of the inner periphery of the annular groove (101) and moves from inside to outside along the inner periphery of the annular groove (101) in the radial direction, and the bottom of the cut annular groove (101) is provided with an arc-shaped inner wall of the circumferential limiting groove (112).

9. The machining method according to claim 8, characterized in that the cutting radius of the disc cutter (5) is smaller than the radius of the annular groove (101).

10. The processing method according to claim 7, wherein when the annular groove (101) is processed, the partition plate flange rotates along the circumference of the partition plate flange, the boring cutter moves from inside to outside along the inner circumferential direction of the partition plate flange, the middle part of the inner circumferential surface of the partition plate flange is cut, and the annular groove (101) which is distributed annularly is formed along the circumferential direction of the inner circumferential surface.