CN110556710A - Vacuum discharge tube and lightning arrester using same - Google Patents
Vacuum discharge tube and lightning arrester using same Download PDFInfo
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- CN110556710A CN110556710A CN201810541210.XA CN201810541210A CN110556710A CN 110556710 A CN110556710 A CN 110556710A CN 201810541210 A CN201810541210 A CN 201810541210A CN 110556710 A CN110556710 A CN 110556710A
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- end cover
- electrode
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- vacuum
- shielding
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T1/00—Details of spark gaps
- H01T1/16—Series resistor structurally associated with spark gap
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T4/00—Overvoltage arresters using spark gaps
- H01T4/02—Details
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T4/00—Overvoltage arresters using spark gaps
- H01T4/04—Housings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T4/00—Overvoltage arresters using spark gaps
- H01T4/10—Overvoltage arresters using spark gaps having a single gap or a plurality of gaps in parallel
- H01T4/12—Overvoltage arresters using spark gaps having a single gap or a plurality of gaps in parallel hermetically sealed
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- Thermistors And Varistors (AREA)
Abstract
The invention provides a vacuum discharge tube and a lightning arrester using the vacuum discharge tube, wherein the vacuum discharge tube comprises an outer shell with a vacuum cavity, the outer shell is provided with an upper electrode and a lower electrode which are correspondingly arranged in the vacuum cavity at intervals to form a vacuum gap, the outer shell comprises an insulating cylinder and an upper end cover and a lower end cover which are in sealing fit with two end parts of the insulating cylinder to form the vacuum cavity, and the upper electrode and the lower electrode are correspondingly and hermetically penetrated on the upper end cover and the lower end cover. During installation, the upper end cover and the lower end cover are hermetically installed at the two ends of the cylinder body, and one ends of the upper electrode and the lower electrode extend into the vacuum discharge tube, so that the vacuum discharge tube is assembled, and the assembly process is simple and convenient.
Description
Technical Field
The invention relates to a vacuum discharge tube and a lightning arrester using the same.
Background
The lightning arrester is the most common equipment for overvoltage protection of a power system, and in a 10kV distribution line, the 10kV lightning arrester is applied in a large quantity. The existing arrester in the market mainly comprises a gapless arrester and a series air gap arrester, and the situation that the gapless arrester bears system voltage under normal operation conditions and has leakage current easily causes the aging of a nonlinear resistance card (a main functional unit in the arrester) to shorten the service life of the arrester. The series air gap lightning arrester comprises an air gap and a resistor disc, wherein the air gap is formed by two electrodes which are exposed in the air and arranged at opposite intervals, the air gap is easily influenced by the outdoor environment, the gap breakdown characteristic is unstable, and the overall service performance of the lightning arrester is influenced.
The structure of the vacuum gap arrester that exists among the prior art, it is shown as a utility model patent of CN201629490U if the publication number is authorized, the vacuum gap arrester includes the stack shell, the stack shell is equipped with the silicon rubber overcoat outward, the inside of stack shell is provided with vacuum discharge tube and the resistance card that links to each other with vacuum discharge tube from top to bottom, be equipped with the extraction electrode in vacuum discharge tube's upper end, lower extreme at the resistance card is connected with telluric electricity field, in the use, when voltage is too high, the heavy current punctures vacuum discharge tube at first, form the short circuit in the vacuum discharge tube, the electric current flows in telluric electricity field through vacuum discharge tube and resistance card, the realization is to electric power system.
As shown in an invention patent with application publication No. 2010, 11/24/2010 and application publication No. CN101894722A, a vacuum discharge tube in the prior art includes an outer shell forming a vacuum cavity, an upper electrode and a lower electrode are mounted on the outer shell, a vacuum gap is formed between the upper electrode and the lower electrode at an interval, and the vacuum gap is a vacuum discharge gap and is used for being broken down to conduct the upper electrode and the lower electrode. The lower electrode is connected with the resistance card, the grounding electrode is connected below the resistance card, the upper end of the upper electrode is connected with the leading-out electrode, when the voltage between the upper electrode and the lower electrode is overlarge in the using process, the vacuum gap is broken down, the upper electrode and the lower electrode are conducted, and the external large current is led to the resistance card and the grounding electrode, so that overvoltage protection is realized. The vacuum discharge tube based on the working principle in the prior art is relatively complex in structure, inconvenient to install and not beneficial to production and manufacturing.
Disclosure of Invention
The invention aims to provide a novel vacuum discharge tube which is convenient to assemble and also provides a lightning arrester using the vacuum discharge tube.
In order to achieve the purpose, the technical scheme of the vacuum discharge tube is as follows:
scheme one of the vacuum discharge tube: a vacuum discharge tube comprises an outer shell with a vacuum cavity, wherein upper and lower electrodes are arranged on the outer shell at intervals in the vacuum cavity correspondingly to form a vacuum gap, the outer shell comprises an insulating cylinder and upper and lower end covers which are hermetically matched with two ends of the insulating cylinder to form the vacuum cavity, and the upper and lower electrodes are correspondingly and hermetically sleeved on the upper and lower end covers.
The invention has the beneficial effects that: in the vacuum discharge tube provided by the invention, the upper electrode is hermetically arranged on the upper end cover in a penetrating manner, the lower electrode is hermetically arranged on the lower end cover in a penetrating manner, when the vacuum discharge tube is installed, the upper end cover and the lower end cover are hermetically installed at two ends of the cylinder body, and one ends of the upper electrode and the lower electrode are also inserted into the vacuum discharge tube, so that the vacuum discharge tube is assembled, and the assembling process is simple and convenient.
Scheme two of the vacuum discharge tube: on the basis of the first scheme, at least one of the upper end cover and the lower end cover is fixedly provided with a shielding structure for shielding the joint of the corresponding end cover and the insulating cylinder in a press fit mode.
The shielding structure is pressed between the end cover and the insulating cylinder body, when the shielding structure is installed, the shielding structure can be installed firstly, the end cover is installed at last, the shielding structure is fixed when the end cover is installed, the installation process is simple and convenient, the shielding structure can shield the joint between the end cover and the insulating cylinder body, and the electric field of the joint is uniform.
Scheme three of the vacuum discharge tube: on the basis of the second scheme, the shielding structure is a shielding cylinder which is provided with a cylinder section extending into the insulating cylinder body and an outward-turning edge for press-fitting a corresponding end cover to fix the shielding cylinder on the insulating cylinder body.
The cylinder section can make the electric field between the two electrodes uniform, so that the discharge characteristic is stable, and simultaneously, the electric arc generated when the electrodes discharge is effectively shielded, so that the electric arc does not damage the insulating cylinder, and the outward-turned edge can facilitate the press mounting of the end cover.
Scheme four of the vacuum discharge tube: on the basis of the third proposal, the cylinder section is provided with a shielding cylinder radial outer bulge which is in press fit with the inner wall top of the insulating cylinder.
The radial outer bulge of the shielding cylinder is in jacking fit with the inner wall of the insulating cylinder along the radial direction, so that the shielding cylinder can be supported, the shielding cylinder is prevented from radially shaking when in use, and when the vacuum discharge tube is assembled, the shielding cylinder and the corresponding end cover can be positioned, and the corresponding electrode of the vacuum discharge tube can be smoothly installed to the correct position.
Scheme five of the vacuum discharge tube: on the basis of the third scheme, the side surface of the outward turning edge facing the corresponding end cover is provided with an annular positioning step, and the corresponding end cover is provided with a cylindrical installation section which is matched and spliced with the annular positioning step.
When the electrode is installed, the annular positioning step on the outward turning edge is matched and inserted with the cylindrical installation section on the corresponding end cover, the annular positioning step of the shielding cylinder and the cylindrical installation section are blocked in the radial direction, the radial direction of the end cover is positioned, and then the electrode is directly installed to the correct position without adjustment, and the assembling process is simple and convenient.
Scheme six of the vacuum discharge tube: on the basis of the third scheme, the fourth scheme or the fifth scheme, the upper end cover and the lower end cover are connected with the insulating cylinder body in a welding mode.
Scheme seven of the vacuum discharge tube: on the basis of the third scheme, the fourth scheme or the fifth scheme, the upper end cover and the lower end cover are respectively fixedly provided with the shielding cylinders on the insulating cylinder in a press-fitting manner, and the cylinder section of one shielding cylinder extends to the circumferential outer side of the vacuum gap.
Scheme eight of the vacuum discharge tube: on the basis of any one of the first to fifth schemes, the upper electrode is an adjustable electrode which can move up and down to adjust the size of the vacuum gap, a corrugated pipe which is rotatably matched with the adjustable electrode and applies downward acting force to the adjustable electrode is sleeved outside the adjustable electrode, the upper end of the corrugated pipe is in press fit or fixed connection with the top of the upper end cover, the lower end of the corrugated pipe is in press fit with a corrugated pipe positioning step arranged on the adjustable electrode, an adjustable electrode mounting seat is spirally arranged on the adjustable electrode, and the adjustable electrode mounting seat is in press fit with an upward stop surface arranged on the upper end cover.
The technical scheme of the lightning arrester is as follows:
Scheme one of the lightning arrester: the utility model provides a lightning arrester, includes vacuum discharge tube and resistance card, vacuum discharge tube, including the shell body that has the vacuum cavity, be equipped with on the shell body correspond the interval arrangement in the vacuum cavity in order to form the upper and lower electrode in vacuum clearance, the shell body include insulating cylinder and with insulating cylinder both ends sealed cooperation in order to form the upper and lower end cover of vacuum cavity, it is equipped with to seal to wear correspondingly on the upper and lower end cover upper and lower electrode.
Scheme two of the arrester: on the basis of the first scheme, at least one of the upper end cover and the lower end cover is fixedly provided with a shielding structure for shielding the joint of the corresponding end cover and the insulating cylinder in a press fit mode.
Scheme three of the arrester: on the basis of the second scheme, the shielding structure is a shielding cylinder which is provided with a cylinder section extending into the insulating cylinder body and an outward-turning edge for press-fitting a corresponding end cover to fix the shielding cylinder on the insulating cylinder body.
Scheme four of the lightning arrester: on the basis of the third proposal, the cylinder section is provided with a shielding cylinder radial outer bulge which is in press fit with the inner wall top of the insulating cylinder.
Scheme five of the arrester: on the basis of the third scheme, the side surface of the outward turning edge facing the corresponding end cover is provided with an annular positioning step, and the corresponding end cover is provided with a cylindrical installation section which is matched and spliced with the annular positioning step.
Scheme six of the lightning arrester: on the basis of the third scheme, the fourth scheme or the fifth scheme, the upper end cover and the lower end cover are connected with the insulating cylinder body in a welding mode.
Scheme seven of the arrester: on the basis of the third scheme, the fourth scheme or the fifth scheme, the upper end cover and the lower end cover are respectively fixedly provided with the shielding cylinders on the insulating cylinder in a press-fitting manner, and the cylinder section of one shielding cylinder extends to the circumferential outer side of the vacuum gap.
Scheme eight of the arrester: on the basis of any one of the first to fifth schemes, the upper electrode is an adjustable electrode which can move up and down to adjust the size of the vacuum gap, a corrugated pipe which is rotatably matched with the adjustable electrode and applies downward acting force to the adjustable electrode is sleeved outside the adjustable electrode, the upper end of the corrugated pipe is in press fit or fixed connection with the top of the upper end cover, the lower end of the corrugated pipe is in press fit with a corrugated pipe positioning step arranged on the adjustable electrode, an adjustable electrode mounting seat is spirally arranged on the adjustable electrode, and the adjustable electrode mounting seat is in press fit with an upward stop surface arranged on the upper end cover.
Drawings
FIG. 1 is a schematic view of a vacuum discharge tube in an embodiment of a surge arrester of the present invention;
FIG. 2 is an enlarged view of the assembly between the ceramic shell, the lower end cap and the shielding can of FIG. 1;
Fig. 3 is a schematic view of an embodiment of the arrester according to the present invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
In the embodiment of the arrester of the present invention, as shown in fig. 1 to 3, the arrester includes a nonlinear resistor sheet 15 and a vacuum discharge tube 14. The vacuum discharge tube 14 includes a cylindrical ceramic envelope 1 having an axis extending in the vertical direction, a lower end of the ceramic envelope 1 is hermetically fitted with a lower end cap 2, the lower end cap 2 is welded to a lower end face of the ceramic envelope 1 by lead-tin soldering, as can be seen from fig. 2, an open end of the lower end cap 2 has a bent section 13 bent outward and then extending upward, and the bent section 13 is connected to the ceramic envelope by lead-tin soldering. The middle position of the lower end cover 2 is provided with the fixed electrode 3 in a penetrating way, in the embodiment, the lower end cover 2 is made of metal, the fixed electrode 3 is fixed on the lower end cover in a welding way, and the lower end cover made of metal has certain strength, so that the function of fixing the electrode is achieved, the structure in the vacuum discharge tube can be protected, and the internal structure can be prevented from being damaged. The upper end of the fixed electrode 3 is positioned in the ceramic shell 1, the lower end of the fixed electrode is positioned below the lower end cover, the upper end of the fixed electrode is of a ring plate structure, and the lower end of the fixed electrode is used for conducting electricity in contact with the nonlinear resistance card 15. The vacuum discharge tube is further provided with a shielding cylinder 4, the shielding cylinder 4 comprises a cylinder section 41, the cylinder section 41 is located at the periphery of a gap between the fixed electrode 3 and the adjustable electrode 7, a shielding cylinder radial outer protrusion 5 is arranged on the outer side of the cylinder section 41, the shielding cylinder radial outer protrusion 5 and the inner wall of the ceramic shell 1 are in contact stop along the radial direction of the cylinder section 41, the cylinder section 41 is supported by the acting force of the contact stop, so that the cylinder section 41 cannot radially shake, and meanwhile, the shielding cylinder radial outer protrusion 5 also plays a role in limiting the position of the cylinder section 41, so that the cylinder section 41 is just located at the middle position of the ceramic shell 1. The shielding cylinder 4 further comprises an outward turning edge 42 positioned at the lower end of the cylinder body section 41, the outward turning edge 42 extends outwards in the radial direction, during assembly, the outward turning edge 42 is pressed on the lower end face of the ceramic shell 1 by the lower end cover 2, an annular positioning step 43 is arranged on the outward turning edge 42, the side face corresponding to the annular positioning step 43 forms a cylindrical outer face 44, during assembly, the lower end cover 2 is inserted and fitted on the outer side of the cylindrical outer face 44, the bending section 13 is pressed on the annular positioning step 43, and then the lower end cover 2 is welded and fixed on the ceramic shell 1. In this embodiment, the portion of the lower end cap 2 that mates with the cylindrical outer surface 44 is a cylindrical mounting section.
In this embodiment, the position of the shield cylinder is located by the radially outward projection of the shield cylinder, and the position of the lower end cap is located by the annular locating step on the shield cylinder. According to the invention, the radial outer bulge of the shielding cylinder and the annular positioning step are matched, so that the assembly is convenient and the assembly position is accurate.
An upper end cover 6 is arranged at the upper end of the ceramic shell 1, wherein the fixing mode of the upper end cover 6 and the upper end face of the ceramic shell 1 is the same as the fixing mode of the lower end cover 2 and the lower end face of the ceramic shell 1, and the content thereof is not described herein again. The upper end cover 6, the lower end cover 2 and the ceramic shell 1 together enclose a closed cavity, and when the ceramic shell is used, the closed cavity is vacuumized to form a vacuum cavity. A shielding ring 8 is pressed between the upper end cover 6 and the upper end face of the ceramic shell 1, the pressing mode of the shielding ring 8 is consistent with that of the shielding cylinder 4, the shielding ring comprises a horizontal ring edge pressed between the upper end cover and the ceramic shell, the inner edge of the shielding ring extends downwards to form an annular folded edge, and a plurality of shielding ring bulges 9 matched with the ceramic shell in a radial stop manner are arranged on the outer side of the annular folded edge. The shielding ring 8 can equalize the electric field at the welding position of the upper end cover 6 and the ceramic shell 1.
The upper end cover 6 is provided with a middle through hole, a flange 10 is arranged above the upper end cover, the flange is used as an adjustable electrode mounting seat for mounting an adjustable electrode, and the flange 10 is in abutting fit with a blocking surface arranged above the upper end cover. The lower end of the flange 10 extends into the middle through hole of the upper end cover 6. The flange 10 is provided with an internal thread, the adjustable electrode 7 is assembled on the internal thread of the flange 10, the upper end of the adjustable electrode 7 is connected with the flange 10 in a threaded mode, and the lower end of the adjustable electrode extends into the ceramic shell 1. The lower end of the flange 10 extends into the middle through hole of the upper end cover 6, so that the threaded connection length between the adjustable electrode 7 and the flange 10 can be increased on the basis of not increasing the heights of the adjustable electrode 7 and the upper end cover 6, and the phenomena of wire sliding and the like are prevented.
In this embodiment, the outer diameter of the lower end of the tunable electrode 7 is larger than the outer diameter of the upper end, so that the tunable electrode 7 has a step surface forming a positioning step of the corrugated pipe, and the mounting disc 12 is rotatably disposed on the step surface, and the step surface can prevent the mounting disc 12 from moving downward in the axial direction. The corrugated pipe 11 is hermetically sleeved outside the adjustable electrode 7, the upper end of the corrugated pipe 11 is welded on the upper end cover 6 (of course, in other embodiments, the corrugated pipe and the upper end cover may be only in a top-bottom pressing fit relationship), the lower end of the corrugated pipe 11 presses against the mounting plate 12, the corrugated pipe 11 is compressed between the mounting plate 12 and the upper end cover 6, because the upper end cover 6 is fixed on the ceramic housing 1 and the corrugated pipe 11 is pressed, the corrugated pipe 11 will generate a continuous downward acting force on the mounting plate 12, and the mounting plate 12 applies the downward acting force to the adjustable electrode and drives the flange 10 to be hermetically mounted above the upper end cover 6.
In this embodiment, the shielding cylinder 4 is located at the periphery of the vacuum gap between the adjustable electrode 7 and the fixed electrode 3, so that the electric field between the two electrodes is uniform during use, the discharge characteristic is stable, and the electric arc generated during electrode discharge is effectively shielded, so that the electric arc does not damage the ceramic shell 1.
The installation process of the vacuum discharge tube of the present embodiment is as follows: firstly, assembling a flange 10, an adjustable electrode 7, an upper end cover 6 and a corrugated pipe 11 together, installing a shielding ring 8 at one end of a ceramic shell 1 through a shielding ring bulge 9, and then welding and fixing a combined part of the flange 10, the adjustable electrode 7 and the corrugated pipe 11 with the ceramic shell 1, so that the shielding ring 8 is pressed and installed at the joint of the ceramic shell 1 and the upper end cover 6, and the adjustable electrode 7 and the shielding ring 8 are installed and fixed. And then the shielding cylinder 4 is arranged at the other end of the ceramic shell 1 through the radial outward bulge 5 of the shielding cylinder, and then the lower end cover 2 is arranged at the lower end of the shielding cylinder 4, the lower end cover 2 and the ceramic shell 1 are fixed together in a welding mode, and the shielding cylinder 4 is pressed between the upper end cover and the lower end cover.
In this embodiment, the shielding ring and the shielding cylinder are both of shielding structures, the shielding structures are respectively arranged between the upper end cover and the insulating cylinder body and between the lower end cover and the insulating cylinder body, and in other embodiments, the shielding structure may be arranged between only one of the end covers and the insulating cylinder body.
When the gap distance between the adjustable electrode 7 and the fixed electrode 3 is different, the vacuum breakdown voltage of the vacuum discharge tube 14 is different, and in actual use, lightning arresters of different models and voltage classes need to have vacuum breakdown voltage values of different specifications, and at the moment, the gap distance between the adjustable electrode and the fixed electrode needs to be adjusted. The example of reducing the gap distance between the adjustable electrode and the fixed electrode is explained, the adjustable electrode is rotated to rotate and move downwards in the flange, that is, the gap distance between the adjustable electrode and the fixed electrode is reduced, and after the adjustable electrode moves downwards, the corrugated pipe can also extend properly, but the top pressure and the sealing to the adjustable electrode are still kept.
As shown in fig. 3, the arrester includes a vacuum discharge tube 14 and a nonlinear resistor 15, when it is installed, the vacuum discharge tube 14 and the nonlinear resistor 15 are first placed in series in an insulating cylinder 16, the insulating cylinder 16 provides the overall strength of the arrester, an upper gland 17 is fixed at the upper end of the insulating cylinder, a fixed ground electrode 20 is fixed at the lower end of the insulating cylinder, a press block 18 and a press spring 19 are sequentially arranged between the upper gland 17 and the flange 10 of the vacuum discharge tube from top to bottom, and a conductive block 21 is arranged between the fixed ground electrode 20 and the nonlinear resistor 15. In the arrester of the present embodiment, the pressing force between the fixed electrode of the vacuum discharge tube and the nonlinear resistor 15 is provided by the pressing spring 19, so that the fixed electrode and the nonlinear resistor 15 are in good contact and can be conducted, and the nonlinear resistor 15 and the conductive block 21, and the conductive block 21 and the fixed ground electrode 20 are in good contact and can be conducted. The upper end of the adjustable electrode of the vacuum discharge tube is led out after passing through the compression spring, the pressing block and the upper gland to form a lead electrode 22, and finally a composite outer sleeve 23 is poured outside the insulating cylinder.
According to the lightning arrester, the non-linear resistance sheet is isolated from the system voltage of the power utilization system by the vacuum gap of the vacuum discharge tube, the system voltage when the power utilization system is normally used is not directly connected with the non-linear resistance sheet, the problem of aging of the non-linear resistance sheet caused by leakage current is solved, and the service life of the lightning arrester is greatly prolonged. Compared with the air gap discharge tube in the prior art, the vacuum discharge tube is a closed cavity, so that the vacuum environment in the cavity cannot be influenced by the external environment, and the breakdown characteristic of the discharge tube is stable.
In this embodiment, the ceramic shell is an insulating cylinder, and in other embodiments, the insulating cylinder may be made of other insulating materials. In this embodiment, the adjustable electrode is an upper electrode, and the fixed electrode is a lower electrode, and in other embodiments, the upper and lower positions of the adjustable electrode and the fixed electrode can be interchanged. The length and radius of the shielding cylinder can be changed according to actual conditions. In this embodiment, the shielding cylinder is disposed between the lower end cover and the insulating cylinder, and in other embodiments, the shielding cylinder may be disposed between the upper end cover and the insulating cylinder.
In the embodiment of the vacuum discharge tube of the present invention, the structure of the vacuum discharge tube is the same as that of the above embodiment, and the details thereof are not repeated herein.
finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (10)
1. A vacuum discharge tube comprises an outer shell with a vacuum cavity, wherein the outer shell is provided with an upper electrode and a lower electrode which are correspondingly arranged in the vacuum cavity at intervals to form a vacuum gap, and the vacuum discharge tube is characterized in that: the outer shell comprises an insulating cylinder body, an upper end cover and a lower end cover, wherein the upper end cover and the lower end cover are in sealing fit with two end parts of the insulating cylinder body to form the vacuum cavity, and the upper electrode and the lower electrode are correspondingly and hermetically arranged on the upper end cover and the lower end cover in a penetrating mode.
2. The vacuum discharge tube of claim 1, wherein: and at least one of the upper end cover and the lower end cover is fixedly provided with a shielding structure for shielding the joint of the corresponding end cover and the insulating cylinder body in a press fit manner.
3. The vacuum discharge tube of claim 2, wherein: the shielding structure is a shielding cylinder which is provided with a cylinder section extending into the insulating cylinder body and an outward turning edge for pressing the corresponding end cover to fix the shielding cylinder on the insulating cylinder body.
4. the vacuum discharge tube of claim 3, wherein: the barrel section has a shield barrel radially outer projection press fit against an inner wall top of the insulating barrel.
5. The vacuum discharge tube of claim 3, wherein: the side surface of the outward turning edge facing the corresponding end cover is provided with an annular positioning step, and the corresponding end cover is provided with a cylindrical mounting section which is matched and spliced with the annular positioning step.
6. Vacuum discharge tube according to claim 3 or 4 or 5, wherein: the upper end cover and the lower end cover are connected with the insulating cylinder body in a welding mode.
7. vacuum discharge tube according to claim 3 or 4 or 5, wherein: the upper end cover and the lower end cover are respectively fixedly provided with the shielding cylinders on the insulating cylinder body in a press fit mode, and the cylinder body section of one shielding cylinder extends to the circumferential outer side of the vacuum gap.
8. The vacuum discharge tube of claim 1 ~ 5, wherein the upper electrode is an adjustable electrode movable in a vertical direction to adjust the size of the vacuum gap, the adjustable electrode is externally sleeved with a bellows rotatably engaged with the adjustable electrode and applying a downward force to the adjustable electrode, an upper end of the bellows is press-fitted or fixedly connected to an upper end cap, a lower end of the bellows is press-fitted to a bellows positioning step provided on the adjustable electrode, the adjustable electrode is spirally provided with an adjustable electrode mounting seat, and the adjustable electrode mounting seat is press-fitted to an upward stop surface provided on the upper end cap.
9. The utility model provides a lightning arrester, includes vacuum discharge tube and resistance card, and vacuum discharge tube is equipped with including the shell body that has the vacuum cavity on the shell body correspond the upper and lower electrode of interval arrangement in order to form the vacuum clearance in the vacuum cavity, its characterized in that: the outer shell comprises an insulating cylinder body, an upper end cover and a lower end cover, wherein the upper end cover and the lower end cover are in sealing fit with two end parts of the insulating cylinder body to form the vacuum cavity, and the upper electrode and the lower electrode are correspondingly and hermetically arranged on the upper end cover and the lower end cover in a penetrating mode.
10. A surge arrester according to claim 9, characterized in that: and at least one of the upper end cover and the lower end cover is fixedly provided with a shielding structure for shielding the joint of the corresponding end cover and the insulating cylinder body in a press fit manner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810541210.XA CN110556710B (en) | 2018-05-30 | 2018-05-30 | Vacuum discharge tube and lightning arrester using same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810541210.XA CN110556710B (en) | 2018-05-30 | 2018-05-30 | Vacuum discharge tube and lightning arrester using same |
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| Publication Number | Publication Date |
|---|---|
| CN110556710A true CN110556710A (en) | 2019-12-10 |
| CN110556710B CN110556710B (en) | 2021-07-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810541210.XA Active CN110556710B (en) | 2018-05-30 | 2018-05-30 | Vacuum discharge tube and lightning arrester using same |
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| CN (1) | CN110556710B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112039511A (en) * | 2020-07-17 | 2020-12-04 | 中国核电工程有限公司 | Proximity switch applied to underwater nuclear irradiation environment |
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| CN1697107A (en) * | 2005-04-29 | 2005-11-16 | 西安交通大学 | Controllable discharge switch of high-energy impulse in three electrodes under vacuum environment |
| CN101051577A (en) * | 2007-02-12 | 2007-10-10 | 西安交通大学 | High energy vacuum CROWBAR switch based on high permitivity planar flashover |
| CN101976626A (en) * | 2010-11-09 | 2011-02-16 | 常州市明及电气技术开发有限公司 | Structure of vacuum interrupter |
| CN201812789U (en) * | 2010-08-06 | 2011-04-27 | 蒋贤华 | Vacuum discharging tube |
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2018
- 2018-05-30 CN CN201810541210.XA patent/CN110556710B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1697107A (en) * | 2005-04-29 | 2005-11-16 | 西安交通大学 | Controllable discharge switch of high-energy impulse in three electrodes under vacuum environment |
| CN101051577A (en) * | 2007-02-12 | 2007-10-10 | 西安交通大学 | High energy vacuum CROWBAR switch based on high permitivity planar flashover |
| CN201812789U (en) * | 2010-08-06 | 2011-04-27 | 蒋贤华 | Vacuum discharging tube |
| CN101976626A (en) * | 2010-11-09 | 2011-02-16 | 常州市明及电气技术开发有限公司 | Structure of vacuum interrupter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112039511A (en) * | 2020-07-17 | 2020-12-04 | 中国核电工程有限公司 | Proximity switch applied to underwater nuclear irradiation environment |
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| Publication number | Publication date |
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| CN110556710B (en) | 2021-07-16 |
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