阅读说明：本技术 耐电弧元器件陶瓷绝缘壳体及其加工实施工艺 (arc-element-resistant ceramic insulating shell and processing implementation process thereof ) 是由 薛建平 于 2019-09-23 设计创作，主要内容包括：本发明公开了接触器、继电器、断路器及开关的陶瓷绝缘壳体,一种具有耐强电弧烧蚀功能、可金属化密封焊接,并具有高抗电强度、高穿电压、高耐温性、耐酸碱及高强度等功能的器件陶瓷绝缘壳体。此壳体、结构应用于控电器件中,可使传统控电器件的开断电压直流达600VDC以上,交流达800VAC以上,可使器件的安全性、环境适应性指标大幅提升。(the invention discloses a ceramic insulating shell of a contactor, a relay, a circuit breaker and a switch, which has the functions of strong arc ablation resistance, metallization, sealing and welding, high electric strength resistance, high voltage penetration resistance, high temperature resistance, acid and alkali resistance, high strength and the like. The shell and the structure are applied to the electric control device, the switching-on/off voltage of the traditional electric control device can reach more than 600VDC and more than 800VAC, and the safety and environmental adaptability indexes of the device can be greatly improved.)

1. The arc-resistant component ceramic insulating shell is characterized by comprising a ceramic insulating shell (19); a moving contact piece (6) and a ceramic rotary fixing block (8) are arranged in the middle of the inside of the ceramic insulating shell (19), the moving contact piece (6) is arranged inside the ceramic rotary fixing block (8), and a moving contact head I (5) and a moving contact head II (15) are respectively arranged at two ends of the moving contact piece (6); the moving contact I (5) is connected with the permanent magnet I (4), and the moving contact II (15) is connected with the permanent magnet II (14); the permanent magnet I (4) is connected with a static contact conducting strip component II (17), the permanent magnet II (14) is connected with a static contact conducting strip component I (9), a first conductive copper bar (10) is arranged in the static contact conducting strip component I (9), and the static contact conducting strip component II (17) is provided with a second conductive copper bar (18); an arc extinguishing grid I (2) is arranged on the outer side of the permanent magnet I (4) and the upper part of the static contact conducting strip assembly II (17), and an arc extinguishing grid II (12) is arranged on the outer side of the permanent magnet II (14) and the upper part of the static contact conducting strip assembly I (9); a first metal arc breaking sheet (3) is arranged at the bottom of the first arc extinguishing grid (2), and a second metal arc breaking sheet (13) is arranged at the bottom of the second arc extinguishing grid (12); two side ends of the ceramic insulating shell (19) are respectively provided with an air filter screen I (1) and an air filter screen II (11).

2. the arc-resistant component ceramic insulation shell according to claim 1, wherein the moving contact I (5), the moving contact II (15) and the moving contact piece (6) are combined into a double-breakpoint moving contact piece, the double-breakpoint moving contact piece is installed in the ceramic rotating fixing block (8), and then the double tension spring I (7) and the double tension spring II (16) are installed from two sides of the rotating fixing block (8) and hung on the tension rod to form the rotating moving contact mechanism.

3. The arc-resistant device ceramic insulating shell according to claim 1, wherein the ceramic insulating shell (19) and the central moving contact piece fixing rotary seat therein are made of ceramic by sintering, and the main material of the ceramic insulating shell is prepared by combining alumina powder with a performance-enhancing material.

4. the processing and implementation process of the arc-resistant device ceramic insulating shell according to claim 1, characterized by comprising the following processing and implementation process flows of parts: (1) adopting a formula raw material die to press and form a blank, removing wax at a medium and low temperature for solidification, sintering at a high temperature, locally carving and correcting, inspecting and cleaning for later use; processing a copper conductive piece, welding a contact at a specified position after pickling and passivation, and plating silver on the surface for later use;

(2) Combining a first moving contact (5), a second moving contact (15) and a moving contact (6) into a double-breakpoint moving contact, installing the double-breakpoint moving contact into a ceramic rotary fixing block (8), and then installing a first double tension spring (7) and a second double tension spring (16) into the rotary fixing block (8) from two sides of the rotary fixing block and hanging and buckling the two tension springs on a tension rod to form a rotary moving contact mechanism;

(3) Processing a rotary movable contact mechanism, a first air cleaning filter screen (1), a second air cleaning filter screen (11), a first arc-extinguishing grid (2), a second arc-extinguishing grid (12), a first static contact conductive sheet component (9), a second static contact conductive sheet component (17), a first conductive copper bar (10), a second conductive copper bar (18), a first permanent magnet (4), a second permanent magnet (14), a first metal arc-breaking sheet (3) and a second metal arc-breaking sheet (13) according to the structural size and the process requirements for later use;

(4) The assembled rotary moving contact mechanism is arranged in a ceramic insulating shell (19) according to requirements, and the components are slightly rotated, so that the components can flexibly rotate in the ceramic insulating shell (19); then sequentially arranging a first air cleaning filter screen (1), a second air cleaning filter screen (11), a first arc-extinguishing grid (2), a second arc-extinguishing grid (12), a first static contact conducting sheet assembly (9), a second static contact conducting sheet assembly (17), a first conducting copper bar (10), a second conducting copper bar (18), a first permanent magnet (4), a second permanent magnet (14), a first metal arc-breaking sheet (3) and a second metal arc-breaking sheet (13) into a ceramic insulation shell (19) according to a structural schematic diagram, after all parts are assembled, arranging the ceramic insulation upper shell into the ceramic insulation shell (19), and riveting the upper shell and the lower shell tightly by rivets on each riveting hole to prevent internal parts from loosening and falling off.

5. The process for processing and implementing the arc-resistant component ceramic insulating shell according to claim 4, wherein in order to prevent the ceramic insulating shell (19) from shrinkage deformation and cracking during high-temperature sintering, a sintering and capacity-fixing technical scheme is adopted, and liner blanks with the same structure and size are designed and added at the mouth of a shell cavity and in part of special-shaped cavities, so that the shell is prevented from being deformed or torn during cooling due to uneven shrinkage of the special-shaped cavity during sintering, and the precision and the position degree of the ceramic insulating shell during sintering and forming are ensured.

Technical Field

The invention relates to a ceramic insulating shell, in particular to a ceramic insulating shell for a device, which has the functions of strong arc ablation resistance, metallization, sealing and welding, high electric strength resistance, high voltage penetration resistance, high temperature resistance, acid and alkali resistance, high strength and the like.

Background

it is well known that components such as contactors, relays, circuit breakers, switches, etc. are important electrical control devices on electrical equipment. With the development of science and technology and the progress of society, Chinese equipment has advanced into a high-precision scientific and intelligent era, and the equipment power and the working energy have been developed and improved at double or even tens of times. Limited by the volume of the equipment, the power and the working energy of the equipment can be improved under the condition of not changing the cross section of the conductor, and only the energy storage voltage and the working voltage of the equipment can be greatly improved. For example, the working voltage of a new energy automobile is increased to 450VDC, the charging pile is increased to 750VDC, and the control demand of high direct current voltage enables components of a common plastic insulating shell, such as a contactor, a relay, a breaker, a switch and the like, to be rejected due to the fact that electric arcs cannot be effectively broken when contacts are separated.

the shell materials of common electric control components such as contactors, relays, circuit breakers, switches and the like are all made of thermoplastic or thermosetting plastic materials in a pressing mode, the sealing performance cannot achieve the airtight effect, the vacuum arc extinguishing or inert gas medium arc extinguishing function cannot be achieved in products, when the voltage reaches above 125VDC or 380VAC, arc breaking cannot be achieved due to the fact that a direct-current power supply does not have a zero return point or overhigh alternating-current voltage, the limited contact breaking distance cannot break the arc, the service life of the components is greatly reduced, and even instant burning accidents occur. The capacity reduction of the plastic shell electricity control device must be considered in the use process, for example, when the device is powered up and operated according to the nominal current full load of the device, the conductor material of the device has very large heat productivity due to the fact that the conducting capacity reaches the limit, and the high temperature causes the melting of the device insulator and even causes fire hazard to endanger the personal safety.

At present, the working on-off voltage direct current of devices such as circuit breakers, contactors, relays and switches in the market of China is only 125VDC, and the use requirement of the working voltage 450VDC of mobile equipment such as new energy is far not met. And the traditional electricity control devices are all plastic shells, the electric arc resistance and the temperature resistance are poor, when the controlled equipment runs at full load for a long time, the heat productivity of the conductive parts of the devices is large, the plastic insulators on the periphery of the conductive parts are melted at high temperature, and the conductive parts are fixed and positioned disorderly to cause short circuit, so that the electricity utilization safety accidents and fire disasters endanger the personal safety.

Disclosure of Invention

Aiming at the common plastic shell devices such as a contactor, a relay, a circuit breaker, a switch and the like, the movable contact and the static contact can not break the arc due to overhigh voltage in the disconnection process; the non-sealing structure of the material causes that the arc extinguishing capability is poor, the ablation resistance and the electrothermal resistance can not meet the requirements, so that the environmental performance and the electrical performance grade of the device are greatly reduced. The invention aims to provide a contact structure with double breakpoints, which can reduce the breaking voltage of a contact pair and increase the arc breaking distance, so that the direct current breaking voltage reaches more than 500 VDC; the energy storage quick double-pendulum on-off structure is provided, so that the contact arcing time can be greatly reduced, and the service life of a device is prolonged; the laminated concave metal arc-extinguishing grid is arranged, so that the voltage of the contact pair can be effectively decomposed, and the heat of contact combustion can be quickly conducted away; the permanent magnet arc blowing structure is arranged, so that electric arc can be effectively blown magnetically, and the breaking distance of the contact pair is increased; and has better arc-blowing cooling channel and air filter screen, so that the heat is reduced when the product is in overload operation. The invention can realize the end surface metallization of the ceramic shell, can ensure that the structure operates in an environment of air-tight sealing and filling with inert gas or sulfur difluoride, and has the same structure device and the direct current cut-off voltage of 750 VDC.

in order to achieve the purpose, the invention adopts the following technical scheme: an arc-element-resistant ceramic insulating shell comprises a ceramic insulating shell; the middle part in the ceramic insulating shell is provided with a movable contact spring and a ceramic rotating fixing block, the movable contact spring is arranged inside the ceramic rotating fixing block, and two ends of the movable contact spring are respectively provided with a movable contact I and a movable contact II; the moving contact I is connected with the permanent magnet I, and the moving contact II is connected with the permanent magnet II; the first permanent magnet is connected with a first static contact conducting strip assembly, the second permanent magnet is connected with a first static contact conducting strip assembly, a first conductive copper bar is arranged in the first static contact conducting strip assembly, and a second conductive copper bar is arranged in the second static contact conducting strip assembly; an arc extinguishing grid I is arranged on the outer side of the permanent magnet I and the upper part of the static contact conducting strip assembly II, and an arc extinguishing grid II is arranged on the outer side of the permanent magnet II and the upper part of the static contact conducting strip assembly I; the bottom of the first arc-extinguishing grid is provided with a first metal arc-breaking piece, and the bottom of the second arc-extinguishing grid is provided with a second metal arc-breaking piece; and the end heads at two sides of the ceramic insulating shell are respectively provided with an air filter screen I and an air filter screen II.

furthermore, the moving contact I, the moving contact II and the moving contact are combined into a double-breakpoint moving contact, the double-breakpoint moving contact is installed in the ceramic rotary fixing block, and then the double-tension spring I and the double-tension spring II are installed from two sides of the rotary fixing block and hung and buckled on the pull rod to form the rotary moving contact mechanism. The contact structure of the double-breakpoint movable contact can share and reduce the breaking voltage of the contact pair and increase the arc breaking distance, so that the direct-current breaking voltage is twice of that of the traditional device, and the direct-current breaking voltage can reach more than 500 VDC.

Furthermore, the ceramic insulating shell and the central movable contact piece fixing rotary seat are formed by sintering ceramics, and the main body material of the ceramic insulating shell is alumina powder matched with other performance-enhancing materials.

Further, the processing implementation process of the ceramic insulating shell of the arc-resistant component comprises the following processing implementation process flows of parts: (1) adopting a formula raw material die to press and form a blank, removing wax at a medium and low temperature for solidification, sintering at a high temperature, locally carving and correcting, inspecting and cleaning for later use; processing a copper conductive piece, welding a contact at a specified position after pickling and passivation, and plating silver on the surface for later use;

(2) Combining a first moving contact, a second moving contact and a moving contact into a double-breakpoint moving contact, installing the double-breakpoint moving contact into a ceramic rotary fixed block, and then installing a first double tension spring and a second double tension spring from two sides of the rotary fixed block and hanging and buckling the first double tension spring and the second double tension spring on a pull rod to form a rotary moving contact mechanism;

(3) Processing a rotary movable contact mechanism, a first air cleaning filter screen, a second air cleaning filter screen, a first arc-extinguishing grid, a second arc-extinguishing grid, a first static contact conducting strip assembly, a second static contact conducting strip assembly, a first conductive copper bar, a second conductive copper bar, a first permanent magnet, a second permanent magnet, a first metal arc-breaking piece and a second metal arc-breaking piece for later use according to the structural size and the technological requirements;

(4) The assembled rotary moving contact mechanism is arranged in a ceramic insulation lower shell according to requirements, and the component is slightly rotated, so that the component can flexibly rotate in the shell; and then sequentially arranging the first air cleaning filter screen, the second air cleaning filter screen, the first arc-extinguishing grid, the second arc-extinguishing grid, the first static contact conducting strip component, the second static contact conducting strip component, the first conductive copper bar, the second conductive copper bar, the first permanent magnet, the second permanent magnet, the first metal arc-breaking piece and the second metal arc-breaking piece into the ceramic insulating shell according to the structural schematic diagram, after all parts are assembled, arranging the upper ceramic insulating shell into the ceramic insulating shell, and tightly riveting the upper shell and the lower shell on each riveting hole by using rivets to prevent the internal parts from loosening and falling off.

Furthermore, in order to prevent the ceramic insulating shell from shrinkage deformation and cracking during high-temperature sintering, a sintering and capacity fixing technical scheme is adopted, and liner blanks with the same structure and size are designed and added in the opening part of a shell cavity and part of special-shaped cavities, so that the shell is prevented from being deformed or torn in the cooling process due to uneven shrinkage of the special-shaped cavities in the sintering process, and the precision and the position degree of the ceramic insulating shell during sintering and forming are ensured.

Has the advantages that: (1) the arc-resistant component ceramic insulation shell has a double-breakpoint contact structure, can reduce the disconnection voltage of a contact pair and increase the arc-breaking distance, so that the direct-current disconnection voltage reaches more than 500 VDC; the energy storage quick double-pendulum on-off structure is provided, so that the contact arcing time can be greatly reduced, and the service life of a device is prolonged; the laminated concave metal arc-extinguishing grid is arranged, so that the voltage of the contact pair can be effectively decomposed, and the heat of contact combustion can be quickly conducted away; the permanent magnet arc blowing structure is arranged, so that electric arc can be effectively blown magnetically, and the breaking distance of the contact pair is increased; and has better arc-blowing cooling channel and air filter screen, so that the heat is reduced when the product is in overload operation. The method can be applied to electric control devices such as circuit breakers, contactors, relays and switches, and greatly improves the working voltage and the environmental adaptability of the devices.

(2) The filter screen is arranged on the ceramic insulation shell, so that sand and dust can be effectively prevented from entering the device and being adsorbed on the contact to cause poor contact, the on-off reliability is improved, the arc extinguishing grid can play an arc breaking role, the arc breaking piece prevents arc splashing, the permanent magnet and the arc magnetic field function, the formed arc is elongated, and the on-off distance of the contact pair is increased equivalently.

(3) The shell and the structure are applied to electric control devices such as contactors, relays, circuit breakers, switches and the like, and the on-off voltage and current of the devices can be greatly improved.

Drawings

fig. 1 is a schematic structural view of the present invention.

Detailed Description

the invention will be further explained with reference to the drawings.

An arc-element-resistant ceramic insulating shell comprises a ceramic insulating shell 19; the middle part in the ceramic insulating shell 19 is provided with a movable contact piece 6 and a ceramic rotary fixing block 8, the movable contact piece 6 is arranged in the ceramic rotary fixing block 8, and two ends of the movable contact piece 6 are respectively provided with a movable contact I5 and a movable contact II 15; the moving contact I5 is connected with the permanent magnet I4, and the moving contact II 15 is connected with the permanent magnet II 14; the first permanent magnet 4 is connected with a second static contact conducting strip component 17, the second permanent magnet 14 is connected with a first static contact conducting strip component 9, a first conductive copper bar 10 is arranged in the first static contact conducting strip component 9, and a second conductive copper bar 18 is arranged in the second static contact conducting strip component 17; an arc extinguishing grid I2 is arranged on the outer side of the permanent magnet I4 and the upper part of the static contact conducting strip assembly II 17, and an arc extinguishing grid II 12 is arranged on the outer side of the permanent magnet II 14 and the upper part of the static contact conducting strip assembly I9; a first metal arc breaking piece 3 is arranged at the bottom of the first arc extinguishing grid 2, and a second metal arc breaking piece 13 is arranged at the bottom of the second arc extinguishing grid 12; the end heads at two sides of the ceramic insulating shell 19 are respectively provided with an air filter screen I1 and an air filter screen II 11.

The moving contact 5, the moving contact 15 and the moving contact 6 are combined into a double-breakpoint moving contact, the double-breakpoint moving contact is installed in the ceramic rotary fixing block 8, and then the double tension springs 7 and the double tension springs 16 are installed from two sides of the rotary fixing block 8 and are hung and buckled on the pull rod to form the rotary moving contact mechanism.

The specific processing method of the components contained in the ceramic insulating case 19 is as follows:

(1) machining the first air filter screen 1 and the second air filter screen 11, and cleaning for later use after machining is completed;

(2) Punching and riveting the arc extinguishing grid I2 and the arc extinguishing grid II 12 to obtain a finished product, and inspecting and reserving the finished product;

(3) punching a first metal arc-breaking piece 3 and a second metal arc-breaking piece 13, and cleaning the surfaces for later use after punching;

(3) Manufacturing a neodymium iron boron permanent magnet I4 and a permanent magnet II 14, and cleaning the surfaces of the manufactured finished products for later use;

(4) Stamping a first moving contact 5, a second moving contact 15 and a moving contact piece 6, welding the first moving contact 5 and the second moving contact 15 to two ends of the moving contact piece 6, and after welding, plating silver on the surface for later use;

(5) Winding a first double tension spring 7 and a second double tension spring 16, and then tempering the surface stress of the first double tension spring and the second double tension spring for later use;

(6) Pressing a sintered ceramic rotary fixed block 8, and cleaning for later use;

(7) Stamping the conductive piece and welding the static contact to obtain a first static contact conductive piece assembly 9 and a second static contact conductive piece assembly 17, and plating silver on the surfaces of the first static contact conductive piece assembly and the second static contact conductive piece assembly for later use;

(8) And punching and riveting the first conductive copper bar 10 and the second conductive copper bar 18 to obtain a finished product, and inspecting and reserving the finished product for later use.

The method comprises the steps of adopting a formula raw material die to press and form a blank, removing wax at a medium and low temperature for solidification, sintering at a high temperature, and locally carving and correcting. The technical scheme of sintering and fixing the capacity is adopted, and the liner blanks with the same structure and size are designed and added at the opening part of the cavity of the shell and inside part of the special-shaped cavity, so that the shell is prevented from being deformed or torn in the cooling process due to uneven shrinkage of the special-shaped cavity in the sintering process, and the precision and the position degree of the ceramic insulating shell during sintering and forming are ensured. The ceramic insulation upper and lower shells 19 of the arc-resistant components are fired according to the process, and are cleaned for standby after being inspected and qualified.

After all the parts are produced and processed, the parts are assembled and packaged according to the following process flows: (1) processing a copper conductive piece, welding a contact at a specified position after pickling and passivation, and plating silver on the surface for later use;

(2) Combining a first moving contact 5, a second moving contact 15 and a moving contact 6 into a double-breakpoint moving contact, installing the double-breakpoint moving contact into a ceramic rotary fixing block 8, and then installing a first double tension spring 7 and a second double tension spring 16 from two sides of the rotary fixing block 8 and hanging and buckling the first double tension spring and the second double tension spring on a pull rod to form a rotary moving contact mechanism;

(3) the assembled rotary moving contact mechanism is arranged in a ceramic insulating shell 19 according to requirements, and the components are slightly rotated, so that the components can flexibly rotate in the shell 19; and then sequentially arranging the first air cleaning filter screen 1, the second air cleaning filter screen 11, the first arc-extinguishing grid 2, the second arc-extinguishing grid 12, the first static contact conducting strip assembly 9, the second static contact conducting strip assembly 17, the first conducting copper bar 10, the second conducting copper bar 18, the first permanent magnet 4, the second permanent magnet 14, the first metal arc-breaking piece 3 and the second metal arc-breaking piece 13 into a ceramic insulating shell 19 according to a structural schematic diagram, after all parts are assembled, arranging the ceramic insulating upper shell into the ceramic insulating shell 19, and tightly riveting the upper shell and the lower shell on each riveting hole by rivets to prevent the internal parts from loosening and falling off.