CN110556735A - Cavity plate non-magnetic material filling eddy current blocking process of explosion-proof electrical appliance - Google Patents
Cavity plate non-magnetic material filling eddy current blocking process of explosion-proof electrical appliance Download PDFInfo
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- CN110556735A CN110556735A CN201810555120.6A CN201810555120A CN110556735A CN 110556735 A CN110556735 A CN 110556735A CN 201810555120 A CN201810555120 A CN 201810555120A CN 110556735 A CN110556735 A CN 110556735A
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- Prior art keywords
- eddy current
- filling
- explosion
- metal material
- current blocking
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B11/00—Switchgear having carriage withdrawable for isolation
- H02B11/12—Switchgear having carriage withdrawable for isolation with isolation by horizontal withdrawal
- H02B11/167—Switchgear having carriage withdrawable for isolation with isolation by horizontal withdrawal truck type
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Fuses (AREA)
Abstract
The invention provides a filling eddy current blocking process for a cavity plate nonmagnetic material of an explosion-proof electrical appliance, which comprises the following steps of: cutting an eddy current blocking groove between two adjacent holes of a cabinet body wall plate through which a conductor passes in the explosion-proof cabinet body; filling a non-magnetic metal material in the eddy current blocking groove; riveting and compacting the filling body part filled with the non-magnetic metal material, and assisting in welding; and carrying out hydraulic pressure inspection on the eddy current blocking groove subjected to grooving, filling, riveting and welding according to the explosion-proof product. The invention utilizes the eddy current blocking groove formed on the magnetic path to effectively block and reduce eddy current, and the principle is applied to a high-current high-explosion cabinet with the current of more than 800A for implementation so as to achieve the effect of blocking and reducing eddy current heating.
Description
Technical Field
The invention relates to a mining explosion-proof high-voltage vacuum power distribution device used in an explosion hazard situation, such as an underground coal mine, which realizes the effective reduction of the eddy heating phenomenon generated when an electric conductor passes through an iron explosion-proof box wall plate under the alternating current heavy current state by adopting a non-magnetic material filled eddy blocking structure and an implementation process.
background
There is a physical phenomenon called eddy current, when alternating current passes through a conductor, an alternating electric field is generated around the conductor, according to the principle of electromagnetic induction, an alternating magnetic field is generated in a ferrous magnetic material around the conductor, the alternating magnetic field induces an alternating electromotive force in the ferrous material, and thus eddy current is generated in the ferrous material, and the eddy current heats the material.
In actual production and life, the electromagnetic stove is manufactured by using the eddy current heating effect. However, in other situations, for example, the iron core of the transformer generates heat due to the eddy current phenomenon, which is not desirable, measures should be taken to reduce the damage degree, and thin silicon steel sheets are adopted, each sheet is thin, insulation is added between each sheet, the purpose is to obstruct the magnetic path, increase the magnetic resistance, increase the resistance, and obstruct and reduce the generation of the eddy current.
The rated current of a high-low voltage power distribution cabinet in a common general type (used on the ground and in a common environment) with large current in the transmission and distribution industry reaches more than 6300A, the eddy current heating phenomenon generally exists, and the heating part is generated at the position where an electric conductor (a cable, a copper bar and the like) passes through a magnetic metal plate of the cabinet body in a centralized manner, so that the eddy current heating phenomenon at the position is specifically and effectively treated when the cabinet body is designed.
FIG. 1 shows the eddy current blocking slot opened between the bus bar holes of the common switch cabinet.
At present, explosion-proof high-voltage vacuum power distribution devices (hereinafter referred to as high-voltage explosion cabinets) which are used in coal mines in large quantities have the harm of eddy current heating phenomenon, and the eddy current heating effect of products of the high-voltage explosion cabinets is more serious than that of common high-voltage switch cabinets due to the special requirements of the environment for using the high-voltage explosion cabinets and the explosion-proof structural performance.
According to the electromagnetic induction principle, the larger the sectional area of the iron magnetizer is, the more obvious the eddy current effect is, the high-explosion cabinet is formed by welding thick steel plates, and the eddy current heat effect is more serious due to the increase of the sectional area of the iron magnetizer. The method for reducing eddy heating hazards cannot be simply solved by adopting the method for opening the eddy blocking groove, because each cavity of the explosion-proof electrical product is mutually separated based on the explosion-proof principle, the separation structure can bear the explosion pressure (or equivalent to 1MP hydraulic test) generated by the explosion of the explosion gas mixed according to the specified components in the cavity, and the explosion cannot be conducted outside the cabinet body, so the scheme of simply opening the eddy blocking groove cannot be implemented on the explosion-proof cabinet body. The performance index of the high-voltage explosion cabinet is restricted for a long time, the rated working current of the high-voltage explosion cabinet is limited below 630A for many years, the rated working current of the high-voltage explosion cabinet is less than one tenth of the rated current of a common high-voltage and low-voltage power distribution cabinet, and the high-voltage and low-voltage power distribution cabinet is not suitable for the development requirement of mining equipment.
Disclosure of Invention
The invention provides a filling eddy current blocking process for a cavity plate nonmagnetic material of an explosion-proof electric appliance, which is used for reducing the harm of an eddy current heating phenomenon existing in an explosion-proof electric product. The invention takes the structure diagram of a typical explosion-proof high-voltage vacuum switch cabinet as an example illustrated in figure 2, and provides a specific implementation process of a non-magnetic material filling eddy current blocking structure of a cavity plate of an explosion-proof electrical appliance and a technical scheme aiming at solving the problem of reducing the induced current generated on the rear wall plate 1 of a cabinet body, namely the thermal effect generated by eddy current, wherein the technical process comprises the following steps:
S1: cutting the vortex blocking groove 6: cutting an eddy current blocking groove 6 between two adjacent holes of the rear wall plate 1 of the cabinet body through which the electric conductor passes in the cabinet body;
S2: filling a nonmagnetic metal material: filling and riveting a non-magnetic metal material in the eddy current blocking groove 6 to form a filling body 5;
S3: auxiliary welding: after the step of S2, performing auxiliary welding on the part of the filler 5 filled with the nonmagnetic metal material, and performing welding sealing treatment along the riveted edge of the filler 5;
s4: water pressure detection: and (4) carrying out water pressure inspection on the eddy current barrier structure subjected to slotting, filling, riveting and welding according to the structural requirement of the explosion-proof product.
preferably, the machining means for cutting the eddy current blocking groove 6 in the step S1 is wire cutting, milling or laser cutting.
Preferably, the step of S1 is preceded by the steps of: a threaded hole 7 is formed in advance in a portion where the vortex blocking groove 6 passes through, and the diameter of the threaded hole 7 is larger than the width of the vortex blocking groove 6.
Preferably, the filling of the nonmagnetic metal material in the step S2 includes the steps of: the non-magnetic metal material is molten liquid non-magnetic metal (such as red copper liquid), liquid non-magnetic metal is poured into a casting mould with a cross section shape required by a pre-processed vortex blocking structure, the mould is quickly removed and the filling material is hammered when the liquid non-magnetic metal is slightly solidified and is red, so that the liquid non-magnetic metal is collapsed to two sides and riveted to a base body tightly, and a filling body 5 is formed.
Preferably, the filling of the nonmagnetic metal material in the step S2 includes the steps of: the non-magnetic metal material adopts a red copper plate with the same width as the opened eddy current blocking groove 6, then the two surfaces of the red copper plate are respectively higher than the steel plate by proper height, and then the copper plate is riveted by a riveting method to ensure that the copper plate and the base plate have enough bonding strength to form the filling body 5.
Preferably, the auxiliary welding in the step S3 adopts a welding process with small welding points and highly concentrated welding energy, such as laser welding or argon arc welding, so as to avoid using a high-temperature welding process, such as air gun fusion welding, and avoid serious welding deformation.
The invention has the beneficial effects that: the principle that the vortex blocking groove can effectively block and reduce the vortex is formed in the magnetic path, the scientific principle and the process scheme are applied to a high-current high-explosion cabinet with the current of more than 800A for specific implementation, the heating effect of blocking and reducing the vortex is achieved, the non-magnetic material such as red copper is filled into the vortex blocking groove, the non-magnetic filling material and the main steel are combined in a high-strength mode by adopting the process means of riveting, assisting welding and the like, and the requirement of the explosion-proof performance of the explosion-proof cabinet body is met in strength. Therefore, the rated working current of the high-explosive cabinet is doubled to reach 1250A magnitude order.
Drawings
Fig. 1 is a schematic structural view of a vortex blocking groove formed between bus bar holes of a conventional general-type switch cabinet;
FIG. 2 is a structural diagram of an explosion-proof high-voltage vacuum switch cabinet in the embodiment of the invention;
FIG. 3 is an electrical schematic of FIG. 2;
Fig. 4 shows a rear wall panel of the switchgear cabinet of fig. 2 in a block diagram:
FIG. 5 is a sectional view taken along line A-A of FIG. 4;
FIG. 6 is a schematic view of a vortex breaker groove cut in an exemplary embodiment of the invention;
FIG. 7 is a view showing a process of filling a slot in a rear wall plate with a nonmagnetic material according to an embodiment of the present invention, and is a cross-sectional view B-B of FIG. 6;
FIG. 8 is an enlarged view of the rear panel slot at point M in FIG. 7;
FIG. 9 is an enlarged view of the insulation sleeve base at point N in FIG. 7;
In the figure, the position of the upper end of the main shaft,
1. A rear wall panel; 2. static contact; 3. a moving contact; 4. an insulating sleeve seat; 5. a filler body; 6. a vortex blocking groove; 7. a threaded hole; 8. a switch cavity; 9. a bus wiring cavity; 10. feeding out the wiring cavity; 11. high-voltage vacuum switch handcart.
Detailed Description
The explosion-proof electrical product is provided with a plurality of space cavities according to different functions, each function cavity is completely separated, and related explosion-proof structural performance requirements are met, the requirements mainly include that a hydraulic pressure experiment with 1MP water pressure of 12s can be endured between the separated cavities, no leakage and deformation exist, finally, an explosion experiment can be passed, after mixed explosive gas is detonated in a main cavity, another cavity cannot be detonated or external explosive gas cannot be detonated, and the requirements are mandatory test requirements which the explosion-proof product must meet.
The invention will now be described in detail with reference to the drawings, shown in FIGS. 2-9 and exemplified in the practice thereof.
In this embodiment, as shown in fig. 2, the explosion-proof high-voltage vacuum switch cabinet, the cabinet body is divided into a switch cavity 8 (main cavity) and a bus wiring cavity 9, and a wiring cavity 10 is presented, each space is partitioned by a cabinet body rear wall plate 1, a moving contact 3 on a high-voltage vacuum switch handcart 11 is inserted into a static contact 2 to form a power supply loop, and alternating current flowing on a contact conductor, as shown in an electrical schematic diagram of fig. 3, in this embodiment, six three-phase conductors (contacts) are concentrated in a relatively concentrated region and penetrate through the rear wall plate 1, and therefore induced current, i.e. eddy current, generated on the cabinet body rear wall plate 1 can generate a heat effect, and in order to solve the eddy current heating effect of the part, this embodiment is realized by the following steps:
S1: cutting the vortex blocking groove 6: an eddy current blocking groove 6 is cut between two adjacent holes of the rear wall plate 1 of the cabinet body through which the electric conductor passes in the cabinet body, in this example, four horizontal groove eddy current blocking grooves 6 are shown, namely, the eddy current blocking groove 6 is cut between two adjacent holes through which two groups of A, B, C three-phase static contacts 2 and two groups of moving contacts 3 pass.
S2: filling a nonmagnetic metal material: filling and riveting a non-magnetic metal material in the eddy current blocking groove 6 to form a filling body 5;
s3: auxiliary welding: after the step of S2, performing auxiliary welding on the part of the filler 5 filled with the nonmagnetic metal material, and performing welding sealing treatment along the riveted edge of the filler 5; the step enables the filler 5 made of the non-magnetic metal material and the rear wall plate 1 to be fully combined in a sealing way, and prevents air holes and the like from influencing the explosion-proof performance;
S4: water pressure detection: and (4) carrying out water pressure inspection on the eddy current barrier structure subjected to slotting, filling, riveting and welding according to the structural requirement of the explosion-proof product.
When the process is implemented, the explosion-proof surface such as the insulating sleeve seat 4 is influenced by the groove, and defects such as gaps, holes and smooth finish cannot be influenced by the defects after the groove is partially filled, and the defects need to be repaired and qualified strictly by welding, machining and the like.
The invention relates to a flame-proof electrical product used in an explosion danger occasion under a coal mine, which limits the improvement of rated working current of a mining flame-proof type power distribution device because a physical phenomenon of vortex heating exists when a conductor passes through a wall plate of a flame-proof box. The invention utilizes the eddy current blocking groove which is cut to block eddy current, fills nonmagnetic metal material in the groove, and firmly combines the filling material and the box wall substrate through a series of process steps, thereby meeting the structural strength requirement of an explosion-proof product and reducing the eddy current heating effect. Because the eddy current heating problem is reduced by effective resistance, the rated working current of the mining explosion-proof high-voltage power distribution device is finally improved to 1250A from 630A.
in this embodiment, the machining means for cutting the vortex breaker groove 6 is preferably wire cutting, milling or laser cutting.
The wider the width of the slot, the larger the magnetic resistance of the magnetic circuit is, the better the eddy current resistance reduction effect is, but the later process can be influenced, the bonding strength of the filling non-magnetic material and the plate body needs to be combined with the thickness of the plate, the eddy current blocking effect and the final overall plate strength to ensure whether the explosion-proof performance can be comprehensively considered and the proper slot width is selected. In this embodiment, it is preferable that the method further includes, before the step of S1: a threaded hole 7 is formed in advance in a portion where the vortex blocking groove 6 passes, and the diameter of the threaded hole 7 is larger than the width of the vortex blocking groove 6. The threaded holes 7 are used for preventing deformation and dislocation of the base plate caused by heating in the subsequent filling of non-magnetic metal materials and welding process, effectively preventing deformation by using the pulling attraction of the threads and greatly enhancing the bonding strength of the filling body 5 and the wall plate 1.
In this embodiment, it is preferable that the filling of the nonmagnetic metal material in S2 includes the steps of: the non-magnetic metal material is molten liquid metal (such as red copper liquid), the liquid non-magnetic metal material is poured into a casting mould with the cross section shape required by the pre-processed vortex blocking structure, the mould is quickly removed and the filling material is hammered when the liquid non-magnetic metal material is slightly solidified and is red, so that the liquid non-magnetic metal material is collapsed to two sides and riveted to a base body tightly, and as shown in figures 8 and 9, a filling body 5 is formed.
in this embodiment, preferably, the filling of the nonmagnetic metal material in S2 includes the steps of: the non-magnetic metal material adopts a red copper plate with the same width as the opened eddy current blocking groove 6, then the two surfaces of the red copper plate are respectively higher than the steel plate by proper height, and then the copper plate is riveted by a riveting method to ensure that the copper plate and the base plate have enough bonding strength to form the filling body 5.
in this embodiment, the auxiliary welding in step S3 is preferably performed by laser welding or argon arc welding.
the auxiliary welding process should in principle avoid high temperature welding, such as air gun welding of copper, which causes local deformation of the whole plate, so the welding process should select a welding process with small welding spots and very concentrated welding spot energy.
The invention achieves the purpose of reducing the eddy current heating physical phenomenon by cutting the eddy current blocking groove for blocking the eddy current and filling the eddy current blocking groove with the nonmagnetic metal material, is suitable for the mining explosion-proof power distribution device and all mining explosion-proof electrical products, and the eddy current heating physical phenomenon exists as long as the conductor passes through the thick wall plate of the explosion-proof box body.
The above-described embodiments are merely illustrative of the principles and utilities of the present patent application and are not intended to limit the present patent application. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of this patent application. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical concepts disclosed in the present application shall be covered by the claims of this patent application.
Claims (6)
1. A process for blocking a cavity plate of an explosion-proof electrical appliance by filling a non-magnetic material with eddy current is characterized by comprising the following steps:
s1: cutting out a vortex blocking groove (6): cutting a vortex separation groove (6) between two adjacent holes of a cavity wall plate (1) of a conductive body passing through the explosion-proof cabinet body;
s2: filling a nonmagnetic metal material: filling and riveting a nonmagnetic metal material in the eddy current blocking groove (6) to form a solid filling body (5);
S3: auxiliary welding: after the step of S2, performing auxiliary welding on the part of the filler (5) made of the non-magnetic metal material, and performing welding sealing treatment along the riveted edge of the filler (5);
s4: water pressure detection: and (4) carrying out water pressure inspection on the eddy current barrier structure subjected to slotting, filling, riveting and welding according to the structural requirement of the explosion-proof product.
2. The filling eddy current blocking process for the nonmagnetic material of the cavity plate of the flameproof electrical appliance according to claim 1, which is characterized in that: and the processing means for cutting the eddy current blocking groove (6) in the step S1 is linear cutting, milling or laser cutting.
3. the filling eddy current blocking process for the nonmagnetic material of the cavity plate of the flameproof electrical appliance according to claim 1, which is characterized in that: the method also comprises the following steps before the step of S1: a threaded hole (7) is formed in the part, through which the vortex blocking groove (6) passes, in advance, and the diameter of the threaded hole (7) is larger than the width of the vortex blocking groove (6).
4. The filling eddy current blocking process for the nonmagnetic material of the cavity plate of the flameproof electrical appliance according to claim 1, which is characterized in that: the filling of the nonmagnetic metal material in the step S2 includes the steps of: the non-magnetic metal material adopts molten liquid metal, the liquid non-magnetic metal material is poured into a casting mould with the cross section shape required by the pre-processed vortex blocking structure, the mould is quickly removed and the filling material is hammered when the liquid non-magnetic metal material is solidified slightly and is red, so that the liquid non-magnetic metal material collapses and is riveted to two sides and the base body is tightly and firmly riveted to form a filling body (5).
5. The filling eddy current blocking process for the nonmagnetic material of the cavity plate of the flameproof electrical appliance according to claim 1, which is characterized in that: the filling of the nonmagnetic metal material in the step S2 includes the steps of: the nonmagnetic metal material is a red copper plate with the same thickness and width of the opened eddy current blocking groove (6), then both surfaces of the red copper plate are respectively higher than the steel plate by proper height, and then the copper plate is riveted by a riveting method to ensure that the copper plate has enough bonding strength with the base plate to form the filling body (5).
6. The filling eddy current blocking process for the nonmagnetic material of the cavity plate of the flameproof electrical appliance according to claim 1, which is characterized in that: and the auxiliary welding in the step S3 adopts a laser welding or argon arc welding process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810555120.6A CN110556735A (en) | 2018-06-01 | 2018-06-01 | Cavity plate non-magnetic material filling eddy current blocking process of explosion-proof electrical appliance |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810555120.6A CN110556735A (en) | 2018-06-01 | 2018-06-01 | Cavity plate non-magnetic material filling eddy current blocking process of explosion-proof electrical appliance |
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| CN110556735A true CN110556735A (en) | 2019-12-10 |
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| CN201810555120.6A Pending CN110556735A (en) | 2018-06-01 | 2018-06-01 | Cavity plate non-magnetic material filling eddy current blocking process of explosion-proof electrical appliance |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201750046U (en) * | 2010-07-30 | 2011-02-16 | 丽水万控电气有限公司 | Device used for preventing eddy current of metal closed switch equipment and control equipment |
| CN102364783A (en) * | 2011-10-08 | 2012-02-29 | 天地科技股份有限公司 | Mining explosion suppression and positive voltage high-voltage distribution device |
| CN202940537U (en) * | 2012-11-28 | 2013-05-15 | 南京紫泉电力设计咨询有限公司 | Fixing device for connecting component between transformer and power distribution line |
| CN204012198U (en) * | 2014-09-03 | 2014-12-10 | 浙江万可电气设备有限公司 | A kind of switch cubicle with anti-vortex structure |
| CN204118492U (en) * | 2014-09-19 | 2015-01-21 | 无锡军工智能电气股份有限公司 | Flameproof high-voltage vacuum distribution equipment for mining |
| CN204333843U (en) * | 2014-12-11 | 2015-05-13 | 上海电力设计院有限公司 | Anti-eddy current cover pipe fixation structure |
| CN107394659A (en) * | 2017-07-13 | 2017-11-24 | 河南平高电气股份有限公司 | Cubicle Gas-Insulated Switchgear cartridge module and its cylinder adpting flange |
-
2018
- 2018-06-01 CN CN201810555120.6A patent/CN110556735A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201750046U (en) * | 2010-07-30 | 2011-02-16 | 丽水万控电气有限公司 | Device used for preventing eddy current of metal closed switch equipment and control equipment |
| CN102364783A (en) * | 2011-10-08 | 2012-02-29 | 天地科技股份有限公司 | Mining explosion suppression and positive voltage high-voltage distribution device |
| CN202940537U (en) * | 2012-11-28 | 2013-05-15 | 南京紫泉电力设计咨询有限公司 | Fixing device for connecting component between transformer and power distribution line |
| CN204012198U (en) * | 2014-09-03 | 2014-12-10 | 浙江万可电气设备有限公司 | A kind of switch cubicle with anti-vortex structure |
| CN204118492U (en) * | 2014-09-19 | 2015-01-21 | 无锡军工智能电气股份有限公司 | Flameproof high-voltage vacuum distribution equipment for mining |
| CN204333843U (en) * | 2014-12-11 | 2015-05-13 | 上海电力设计院有限公司 | Anti-eddy current cover pipe fixation structure |
| CN107394659A (en) * | 2017-07-13 | 2017-11-24 | 河南平高电气股份有限公司 | Cubicle Gas-Insulated Switchgear cartridge module and its cylinder adpting flange |
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