Vacuum arc-extinguishing chamber assembling and positioning tool

Abstract

The invention relates to the technical field of high-voltage switches, in particular to a vacuum arc extinguish chamber assembling and positioning tool which comprises a bottom plate and a top plate, the bottom plate is provided with a spigot used for positioning the static end of an arc extinguish chamber, at least three guide columns are arranged with the spigot as the center, the upper ends of the three guide columns are connected with the top plate, and the lower ends of the three guide columns are connected with the top plate. A positioning plate is arranged on the top plate, a positioning rod used for positioning the moving end of the arc extinguish chamber is arranged on the positioning plate in the direction facing the bottom plate, a porcelain shell positioning device capable of moving up and down along the guide columns is arranged on each guide column, and each porcelain shell positioning device comprises a measuring base matched with the corresponding guide column. The measuring base is movably provided with extension scales used for abutting against the peripheral face of the porcelain shell, and intersection points of extension lines of the extension scales intersect on the center line of the spigot. The device can guarantee accurate positioning and uniform gaps in the circumferential direction when the external porcelain shell is in butt joint; the device is simple in structure, convenient to mount and dismount and high in adaptability.

Description

Technical Field

[0001] The invention relates to the technical field of medium and high voltage switches, and in particular to an assembly and positioning tool for a vacuum interrupter. Background Art

[0002] As the core component of medium and high voltage switches, vacuum interrupter is mainly composed of moving and static contacts, moving and static conductive rods, shielding cover, porcelain shell and other components. Its main function is to quickly extinguish the arc and suppress the current after the medium and high voltage circuit is cut off from power supply through the excellent insulation of the vacuum inside the tube, so as to avoid accidents and unexpected events.

[0003] As a medium and high voltage breaking unit, the performance of the vacuum interrupter will directly affect the performance and service life of the medium and high voltage switch. At present, the vacuum interrupter is mainly produced by the one-time sealing technology, which means that the components of the vacuum interrupter are first brazed into several parts, and then these parts are assembled into the vacuum interrupter as a whole, and then the exhaust, baking degassing and brazing sealing process are completed in a vacuum furnace. This process is relatively simple, with high production efficiency and less human pollution, so it is widely used in the production and manufacturing of vacuum interrupters. However, there is no assembly positioning structure for parts such as porcelain shells and shielding covers during the assembly process, and they are often assembled by visual inspection or experience of the staff. This is not only time-consuming and labor-intensive, but also makes it impossible to accurately control the relative position of parts such as porcelain shells and shielding covers in the radial direction, which will lead to poor assembly consistency and low assembly efficiency, thus affecting the performance of the vacuum interrupter.

[0004] The Chinese invention patent application document with application publication number CN118692845A and application publication date 2024 / 09 / 24 discloses a vacuum arc chamber assembly and positioning device, the device including a bottom plate, an intermediate positioning piece and a top plate, the bottom plate having a support surface for supporting the static end of the arc chamber, a stopper is provided on the bottom plate for cooperating with the static end and having a unique assembly relationship with the static end in the radial direction, a mating connection hole is provided on the top plate for cooperating with the moving end of the arc chamber, an alignment hole is also provided on the top plate for aligning with the anti-rotation surface of the moving end to determine the unique assembly relationship between the top plate and the moving end in the circumferential direction, the bottom end of the intermediate positioning piece is connected to the bottom plate, and a positioning hole is provided on the top plate for the top end of the intermediate positioning piece to be inserted or penetrated and determine the unique corresponding position relationship between the top plate and the bottom plate.

[0005] The device can ensure the unique relative position of the moving end and the static end in the circumferential direction, and then ensure the unique angular position of the moving and static contacts in the circumferential direction, ensuring the assembly accuracy. However, the ceramic used as the shell of the vacuum arc chamber has poor dimensional consistency due to the inconsistent volume shrinkage rate of the blank during the sintering process, that is, the diameter will deviate. The exterior of the vacuum arc chamber is generally composed of at least two sections of ceramic shells that are brazed, and the device cannot ensure the uniformity of the gap in the circumferential direction when the ceramic shells are butt-jointed. This will lead to uneven welds during brazing, and even cracks in the welds under the action of internal stress and working load, causing problems such as air leakage in the vacuum arc chamber, thereby reducing the insulation and arc extinguishing performance and affecting the use of the vacuum arc chamber. Summary of the invention

[0006] The object of the present invention is to provide a vacuum interrupter assembly positioning tool to solve the problem that the existing device cannot ensure the uniformity of the gap in the circumferential direction when the external porcelain shells are butt-jointed.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a vacuum arc chamber assembly positioning tool, comprising a bottom plate and a top plate, the bottom plate is provided with a stop for positioning the static end of the arc chamber, the bottom plate is arranged with at least three guide pillars with the stop as the center, the upper ends of the three guide pillars are connected to the top plate, the top plate is provided with a positioning plate, the positioning plate is provided with a positioning rod for positioning the moving end of the arc chamber in the direction toward the bottom plate, each of the guide pillars is respectively provided with a porcelain shell positioning device that can move up and down along the guide pillar, the porcelain shell positioning device comprises a measuring base matched with the corresponding guide pillar, a telescopic ruler for pressing against the outer peripheral surface of the porcelain shell is movably installed on the measuring base, and the intersection of the extension lines of each of the telescopic rulers intersects on the center line of the stop.

[0008] Furthermore, a telescopic ruler mounting hole is provided on the measuring base, the tail end of the telescopic ruler is located in the corresponding mounting hole, and the front end extends out of the corresponding mounting hole. An adjusting screw for ejecting the telescopic ruler is also provided on the measuring base at the tail of the corresponding telescopic ruler.

[0009] Furthermore, the front end of the mounting hole is provided with an inner rib, the rear end of the telescopic ruler is provided with an outer flange that cooperates with the inner rib at the front end of the corresponding mounting hole, a blocking cover is fixedly installed at the rear end of the mounting hole, and the adjusting screw is installed on the blocking cover.

[0010] Furthermore, a return spring for driving the telescopic ruler to retract is installed between the inner rib and the outer flange.

[0011] Furthermore, positioning holes corresponding to the heights of the ceramic shells of each section are arranged along the guide column, and positioning pins for cooperating with the positioning holes to lock the measuring base to a corresponding height are arranged on the measuring base.

[0012] Furthermore, the guide column and the base plate are detachably connected.

[0013] Furthermore, the lower end of the guide column is inserted into the bottom plate and a slot is provided on the outer peripheral surface of the portion above the bottom plate. A pressing plate corresponding to the guide column is detachably fixed on the bottom plate, and one side of the pressing plate is embedded in the slot of the corresponding guide column to press and fix the guide column.

[0014] Furthermore, it also includes a shielding cover positioning block for positioning the shielding cover, and a handle is provided on the upper side of the shielding cover positioning block.

[0015] Furthermore, the shield cover positioning block is a radially split structure, and the handles are respectively provided on each split part.

[0016] Furthermore, the top plate and the bottom plate are both in the shape of a truncated equilateral triangle, and each of the guide pillars is installed at three fixed points of the equilateral triangle.

[0017] Beneficial effect: The vacuum arc chamber assembly positioning tool of the present invention is an improved invention. The device of the present invention is connected to the top plate through at least three guide pillars arranged on the bottom plate with the stop as the center, and the moving end of the arc chamber is positioned by the positioning plate and the positioning rod provided on the top plate. The guide pillars are circumferentially distributed with the stop as the center, so that the telescopic ruler connected to the guide pillars through the measuring base can be distributed circumferentially, so as to more accurately fit and position the cylindrical porcelain shell. The precise scale line of the telescopic ruler can intuitively find out whether the porcelain shell is offset. In addition, the telescopic ruler moves up and down along the guide pillar with the measuring base to ensure the positioning of porcelain shells of different heights. The telescopic ruler is movably installed on the measuring base to ensure the positioning of porcelain shells of different diameters and ensure that each porcelain shell is coaxial, thereby solving the problem that the existing device cannot ensure the uniformity of the gap in the circumferential direction when the external porcelain shells are connected in pairs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic structural diagram of an embodiment of a vacuum interrupter assembly positioning tool of the present invention; Figure 2 It is a structural schematic diagram of the porcelain shell positioning device; Figure 3 This is a schematic diagram of the structure of the shield cover positioning block; Figure 4 A schematic diagram of the use of an embodiment of a vacuum interrupter assembly positioning tool of the present invention.

[0019] In the figure: 1. bottom plate; 2. top plate; 3. guide column; 4. stopper; 5. porcelain shell; 6. positioning plate; 7. positioning rod; 8. measuring base; 9. telescopic ruler; 10. mounting hole; 11. adjusting screw; 12. inner rib; 13. outer flange; 14. plug cover; 15. reset spring; 16. positioning hole; 17. positioning pin; 18. pressure plate; 19. fastening bolt; 20. shielding cover positioning block; 21. handle. DETAILED DESCRIPTION

[0020] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0021] The vacuum interrupter assembly positioning tool of the present invention can solve the problem that the existing device cannot ensure the uniformity of the gap in the circumferential direction when the external porcelain shell is butted. The device of the present invention uses a telescopic ruler that can move up and down along the guide column arranged on the guide column centered on the stop to position porcelain shells of different heights. Secondly, the movement of the telescopic ruler can be used for porcelain shells of different diameters. The positioning of the porcelain shell is ensured by the precise size measurement of the telescopic ruler. The device has a simple structure and is easy to install and disassemble.

[0022] As a basic solution, Figure 1-4As shown, the vacuum arc chamber assembly and positioning tool of the present invention includes a bottom plate 1 and a top plate 2, the bottom plate 1 provides a support surface for the static end of the vacuum arc chamber, and the bottom plate 1 serves as the basic support of the entire tool, the bottom plate 1 is provided with a stopper 4 for positioning the static end of the arc chamber, the stopper 4 can connect the static end of the arc chamber with the bottom plate 1 and determine the installation position of the static end of the arc chamber, to avoid the static end of the arc chamber from deviating and affecting the installation of subsequent parts, at least three guide pillars 3 are arranged on the bottom plate 1 with the stopper 4 as the center, and The upper ends of the three guide pillars 3 are connected to the top plate 2, and the two ends of each guide pillar 3 are respectively connected to the bottom plate 1 and the top plate 2, which can serve as a support for the top plate 2 to improve the stability of the device. The guide pillars 3 are arranged with the stopper 4 as the center, that is, the three guide pillars 3 are distributed circumferentially on the bottom plate 1, so that the porcelain shell positioning device installed later can also be distributed circumferentially to ensure the positioning of the cylindrical porcelain shell 5. A positioning plate 6 is provided on the top plate 2, and the positioning plate 6 is provided with a arc extinguishing device in the direction toward the bottom plate 1. The positioning rod 7 for positioning the moving end of the chamber, each of the guide columns 3 is respectively provided with a porcelain shell positioning device that can move up and down along the guide column 3, the porcelain shell positioning device is used to position the porcelain shell 5 installed outside the arc extinguishing chamber, and moving up and down along the guide column 3 can ensure the positioning of porcelain shells 5 of different heights, the porcelain shell positioning device includes a measuring base 8 matched with the corresponding guide column 3, and a telescopic ruler 9 for supporting the outer peripheral surface of the porcelain shell 5 is movably installed on the measuring base 8, and the intersection of the extension lines of each of the telescopic rulers 9 intersects on the center line of the stop 4. Through the precise scale size on the telescopic ruler 9, the position of the porcelain shell 5 can be intuitively observed, and each telescopic ruler 9 is also circumferentially distributed, so that it is possible to judge whether the porcelain shell 5 is offset, which is convenient for the next step of work; the telescopic ruler 9 can move up and down along the guide column 3 with the measuring base 8 on the one hand, and can be retracted and retracted on the other hand, so that it can meet the positioning of porcelain shells 5 of different heights and the positioning of porcelain shells 5 of different diameters, and has high applicability, and the device has a relatively simple structure and is easy to install.

[0023] As a preferred embodiment, Figure 2As shown, the measuring base 8 is provided with a mounting hole 10 for the telescopic ruler 9, the tail end of the telescopic ruler 9 is located in the corresponding mounting hole 10, and the front end extends out of the corresponding mounting hole 10. The display scale is convenient for the staff to visually observe the size for the next adjustment. The measuring base 8 is also provided with an adjusting screw 11 for ejecting the telescopic ruler 9 at the tail corresponding to the telescopic ruler 9. The adjusting screw 11 has the advantages of high bearing capacity, simple structure and easy operation. The telescopic ruler 9 can be ejected by rotating the adjusting screw 11 to display the scale of the telescopic ruler 9. The adjusting screw 11 is provided with a thread, so the adjusting screw 11 can be moved by thread transmission when rotating, which is more labor-saving and convenient. In other embodiments, a push rod is used instead of the adjusting screw 11, and the telescopic ruler 9 can be directly pushed by the push rod. Although it is not as labor-saving as in the preferred embodiment, it can also achieve the purpose of pushing the telescopic ruler 9 to move.

[0024] As a preferred embodiment, Figure 2 As shown, the front end of the mounting hole 10 is provided with an inner rib 12, and the rear end of the telescopic ruler 9 is provided with an outer flange 13 that cooperates with the inner rib 12 at the front end of the corresponding mounting hole 10. The contact portion between the front end of the telescopic ruler 9 and the ceramic shell 5 can be set to an arc shape, which is convenient for more accurate fitting and positioning with the ceramic shell 5. A blocking cover 14 is fixedly installed at the rear end of the mounting hole 10, and the adjusting screw 11 is installed on the blocking cover 14. The inner rib 12 and the outer flange 13 can prevent the telescopic ruler 9 from falling off from the mounting hole 10. When the adjusting screw 11 is rotated, the adjusting screw 11 contacts the outer flange 13 and pushes the outer flange 13 to realize the movement of the telescopic ruler 9 and thereby realize the positioning of the ceramic shell 5. In other embodiments, the contact position between the telescopic ruler 9 and the ceramic shell 5 can also be set to other shapes such as a circle or a rectangle. In addition, the blocking cover 14 is not provided, and a threaded hole is directly provided on the hole wall of the mounting hole 10, so that the telescopic ruler can pass through the threaded hole, and the adjusting screw rod 11 cooperates with the thread to move the adjusting screw rod along the mounting hole 10. Although this will make the size of the adjusting screw rod 11 larger and cause material waste to a certain extent, it does not affect the effect of the adjusting screw rod 11 pushing the telescopic ruler 9.

[0025] As a preferred embodiment, Figure 2As shown, a reset spring 15 for driving the telescopic ruler 9 to retract is installed between the inner rib 12 and the outer flange 13. The elastic force of the reset spring 15 can push the outer flange 13 of the telescopic ruler 9 and drive the telescopic ruler 9 to reset. The reset spring 15 has good deformation characteristics and can quickly return to the original state after being subjected to pressure and released, and can also play a supporting role. In other embodiments, the reset spring 15 is not provided, and a rotating shaft is provided between the outer flange 13 and the adjusting screw 11. When the adjusting screw 11 is rotated, the rotating shaft is driven to rotate, and the rotating shaft drives the telescopic ruler 9 to rotate. At this time, when the adjusting screw 11 moves under the action of the threaded transmission, it can drive the telescopic ruler 9 to move, and the telescopic ruler 9 can also be reset.

[0026] As a preferred embodiment, a positioning hole 16 corresponding to the height of each section of the porcelain shell 5 is provided along the guide column 3, and a positioning pin 17 for cooperating with the positioning hole 16 to lock the measuring base 8 to the corresponding height is provided on the measuring base 8. The positioning pin 17 cooperates with the positioning hole 16 to achieve fixation between the measuring base 8 and the corresponding guide column 3. The positioning pin 17 has a good bearing capacity, runs through the measuring base 8 and the guide column 3, and also plays a limiting role to prevent the measuring base 8 from moving on the guide column 3 and causing inaccurate positioning of the porcelain shell 5. The positioning pin 17 has a simple structure and a low production cost. In other embodiments, a threaded hole can be provided on the measuring base 8, and a top screw can be provided in the threaded hole. The top screw is rotated so that the top screw contacts and tightens the guide column 3 to prevent the measuring base 8 from moving.

[0027] As a preferred embodiment, the guide column 3 is detachably connected to the bottom plate 1. The detachable connection facilitates the removal of the guide column 3 and components such as the top plate 2 after the vacuum arc chamber is assembled, leaving only the bottom plate 1 for transporting the assembled vacuum arc chamber. The lower end of the guide column 3 is inserted into the bottom plate 1 and a groove is provided on the outer peripheral surface of the portion above the bottom plate 1. A pressing plate 18 corresponding to the guide column 3 is detachably fixed on the bottom plate 1. One side of the pressing plate 18 is embedded in the corresponding groove of the guide column 3 to press and fix the guide column 3. Bolt holes can be provided on the pressing plate 18. , threaded holes corresponding to the bolt holes are arranged on the bottom plate 1, and the pressing plate 18 and the bottom plate 1 are detachably fixed by fastening bolts 19 matched with the bolt holes and the threaded holes, thereby realizing the detachable fixation between the guide column 3 and the bottom plate 1. The bolt holes are arranged on the pressing plate 18 so that the heads of the fastening bolts 19 are facing upward when the pressing plate 18 and the bottom plate 1 are connected, which is convenient for operation. The pressing plate 18 can increase the area, which is convenient for providing sufficient installation space for the fastening bolts 19. The detachable fixation between the guide column 3 and the bottom plate 1 is realized by the pressing plate 18, which is convenient for installing other parts except the bottom plate 1 The other components can be quickly installed or disassembled, which can avoid the problem of putting the entire positioning tooling into the vacuum brazing furnace with the arc extinguishing chamber, and shortening the service life of the tooling due to the high temperature in the furnace. After the arc extinguishing chamber is assembled, only the base plate 1 is sent into the vacuum brazing furnace with the arc extinguishing chamber to complete the welding of the entire tube, wherein the base plate 1 can be made of special high-temperature resistant materials to extend the service life of the base plate 1. In addition, this detachable connection can make the positioning tooling of the present invention modular. When an abnormal situation or damage occurs, only the corresponding components need to be maintained or replaced, thereby improving the service life of the positioning tooling. In other embodiments, a protrusion can be set on the base plate 1, and a groove matching the protrusion can be set at the bottom of the guide column 3. When the guide column 3 is installed, the groove is matched with the protrusion. When this connection method is used for a long time and frequently loaded and unloaded, the protrusion and the groove may be worn to a certain extent, and the protrusion and the groove will become loose when they are matched and connected, resulting in an unstable connection between the guide column 3 and the base plate 1, affecting the measurement results, and requiring regular inspection and maintenance, but the purpose of the detachable connection between the base plate 1 and the guide column 3 can also be achieved.

[0028] As a preferred embodiment, Figure 3 As shown, it also includes a shielding cover positioning block 20 for positioning the shielding cover, and a handle 21 is provided on the upper side of the shielding cover positioning block 20. The handle 21 is provided to facilitate the installation and removal of the shielding cover positioning block 20. The shielding cover positioning block 20 is a radial split structure, and the handle 21 is provided on each part of the split. The shielding cover positioning block 20 is arranged as two radial halves that can fit tightly on the shielding cover to achieve the positioning of the shielding cover, and the two radially split halves can be quickly placed on both sides of the shielding cover and fit together through the handle 21, without the need for complicated adjustment or calibration, thereby simplifying the installation process.

[0029] As a preferred embodiment, the top plate 2 and the bottom plate 1 are both in the shape of a truncated equilateral triangle, and each of the guide pillars 3 is installed at three fixed points of the equilateral triangle. Setting it as a truncated equilateral triangle can optimize the structure of the top plate 2 and the bottom plate 1, reduce unnecessary material waste, save space, and thus reduce costs. The installation of each guide pillar 3 at a fixed point can also maximize the use of the bottom plate 1 and the top plate 2, so that the telescopic ruler 9 installed on the guide pillar 3 through the measuring base 8 has a larger adjustable range to meet the use of different diameters of the porcelain shell 5. In other embodiments, it can be selected to be set to a square or other shape without affecting the overall use of the device.

[0030] The specific use process of the vacuum interrupter assembly positioning tool of the invention is as follows: Figure 4 As shown, the static end contact of the arc extinguishing chamber is first welded and placed on the positioning tool base plate 1 of the present invention, and positioned by the stop 4 on the base plate 1, then the static end shielding cover is installed, and the two halves of the radially separated shielding cover are fitted together for positioning by the shielding cover positioning block 20, and then the first layer of porcelain shell 5 is installed and the porcelain shell 5 is positioned by the porcelain shell positioning device; the other layers of porcelain shell 5, shielding cover and other parts are placed in sequence from bottom to top and positioned until the installation and positioning of the moving end shielding cover are completed, and the moving end shielding cover is based on the moving end positioning rod 7 and is also centered and positioned by the shielding cover positioning block 20; finally, the moving end positioning rod 7 is removed, and the moving end contact is welded; after the installation is completed, the fastening bolts 19 and the pressure plate 18 connected to the base plate 1 can be removed, and the rest of the parts except the base plate 1 are disassembled as a whole, and then the base plate 1 together with the vacuum arc extinguishing chamber are sent to the vacuum brazing furnace to complete the whole pipe welding.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. A vacuum arc chamber assembly and positioning tool, comprising a bottom plate and a top plate, wherein the bottom plate is provided with a stopper for positioning the static end of the arc chamber, characterized in that: At least three guide pillars are arranged on the bottom plate with the stop as the center, the upper ends of the three guide pillars are connected to the top plate, a positioning plate is provided on the top plate, a positioning rod for positioning the moving end of the arc extinguishing chamber is provided on the positioning plate in the direction toward the bottom plate, each of the guide pillars is respectively provided with a porcelain shell positioning device which can move up and down along the guide pillar, the porcelain shell positioning device includes a measuring base matched with the corresponding guide pillar, a telescopic ruler for supporting the outer peripheral surface of the porcelain shell is movably installed on the measuring base, and the intersection of the extension lines of each of the telescopic rulers intersects on the center line of the stop.

2. The vacuum interrupter assembly and positioning tool according to claim 1, characterized in that: The measuring base is provided with a telescopic ruler mounting hole, the tail end of the telescopic ruler is located in the corresponding mounting hole, and the front end extends out of the corresponding mounting hole. The measuring base is also provided with an adjusting screw rod for ejecting the telescopic ruler at the tail of the corresponding telescopic ruler.

3. The vacuum interrupter assembly and positioning tool according to claim 2, characterized in that: The front end of the mounting hole is provided with an inner rib, the rear end of the telescopic ruler is provided with an outer flange that cooperates with the inner rib at the front end of the corresponding mounting hole, a blocking cover is fixedly installed at the rear end of the mounting hole, and the adjusting screw is installed on the blocking cover.

4. The vacuum interrupter assembly and positioning tool according to claim 3, characterized in that: A return spring for driving the telescopic ruler to retract is installed between the inner rib and the outer flange.

5. The vacuum interrupter assembly and positioning tool according to claim 1, characterized in that: Positioning holes corresponding to the heights of the ceramic shells of each section are arranged along the guide column, and positioning pins for cooperating with the positioning holes to lock the measuring base to a corresponding height are arranged on the measuring base.

6. The vacuum interrupter assembly and positioning tool according to claim 1 or 5, characterized in that: The guide column is detachably connected to the bottom plate.

7. The vacuum interrupter assembly and positioning tool according to claim 6, characterized in that: The lower end of the guide column is inserted into the base plate and a slot is provided on the outer peripheral surface of the portion above the base plate. A pressure plate corresponding to the guide column is detachably fixed on the base plate, and one side of the pressure plate is embedded in the slot of the corresponding guide column to press and fix the guide column.

8. The vacuum interrupter assembly and positioning tool according to claim 1, characterized in that: It also includes a shielding cover positioning block for positioning the shielding cover, and a handle is arranged on the upper side of the shielding cover positioning block.

9. The vacuum interrupter assembly and positioning tool according to claim 8, characterized in that: The shield cover positioning block is a radial split structure, and the handles are respectively arranged on each split part.

10. The vacuum interrupter assembly and positioning tool according to claim 1, characterized in that: The top plate and the bottom plate are both in the shape of a truncated equilateral triangle, and each of the guide posts is installed at three fixed points of the equilateral triangle.

Images