CN107978490A - A High Voltage DC Relay with Composite Moving Contact - Google Patents
A High Voltage DC Relay with Composite Moving Contact Download PDFInfo
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- CN107978490A CN107978490A CN201810052685.2A CN201810052685A CN107978490A CN 107978490 A CN107978490 A CN 107978490A CN 201810052685 A CN201810052685 A CN 201810052685A CN 107978490 A CN107978490 A CN 107978490A
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- 239000002131 composite material Substances 0.000 title claims abstract description 15
- SBYXRAKIOMOBFF-UHFFFAOYSA-N copper tungsten Chemical compound [Cu].[W] SBYXRAKIOMOBFF-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000000926 separation method Methods 0.000 claims abstract description 7
- 230000001066 destructive effect Effects 0.000 claims abstract description 5
- 235000014676 Phragmites communis Nutrition 0.000 claims description 26
- DMFGNRRURHSENX-UHFFFAOYSA-N beryllium copper Chemical compound [Be].[Cu] DMFGNRRURHSENX-UHFFFAOYSA-N 0.000 claims description 25
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 14
- 239000010949 copper Substances 0.000 claims description 14
- 229910052802 copper Inorganic materials 0.000 claims description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 13
- 229910052790 beryllium Inorganic materials 0.000 claims description 7
- ATBAMAFKBVZNFJ-UHFFFAOYSA-N beryllium atom Chemical compound [Be] ATBAMAFKBVZNFJ-UHFFFAOYSA-N 0.000 claims description 7
- 230000006835 compression Effects 0.000 claims description 5
- 238000007906 compression Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 4
- 230000001681 protective effect Effects 0.000 claims description 4
- 229910000906 Bronze Inorganic materials 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 230000005284 excitation Effects 0.000 claims description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 2
- 229910052721 tungsten Inorganic materials 0.000 claims description 2
- 239000010937 tungsten Substances 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 claims 1
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 244000089486 Phragmites australis subsp australis Species 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H50/00—Details of electromagnetic relays
- H01H50/54—Contact arrangements
- H01H50/541—Auxiliary contact devices
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Contacts (AREA)
Abstract
本发明涉及一种带复合型动触头的高压直流继电器，主体包含有低压主控系统，高压被控系统和联动轴，高压被控系统中的动触头呈复合型，由条状动触片充任的传统动触头和由并列增加设置在条状动触片左右两侧、高度略大于条状动触片厚度的钨铜辅助动触点构成。工作时，辅助动触点先于条状动触片通电、后于条状动触片分离断电，能确保原有条状动触片免受电路接通时瞬间大电流的冲击和电路断开时电弧的破坏性影响，在确保动触点的整体可靠工作寿命的同时，还有效降低了触点间的分离力，杜绝继电器在大电流工作状态下触点间分离不爽、甚至粘结情况的发生，有利于确保继电器的工作稳定性、安全可靠性和扩大工作适用面，有很强的实用性。
The invention relates to a high-voltage direct current relay with a composite movable contact. The main body includes a low-voltage main control system, a high-voltage controlled system and a linkage shaft. The traditional moving contact as a strip and the tungsten-copper auxiliary moving contact arranged side by side on the left and right sides of the strip moving contact with a height slightly greater than the thickness of the strip moving contact. When working, the auxiliary movable contact is energized before the strip-shaped movable contact, and then separated from the strip-shaped movable contact, which can ensure that the original strip-shaped movable contact is free from the impact of the instantaneous large current when the circuit is connected and the circuit is broken. The destructive effect of the arc at the time of opening, while ensuring the overall reliable working life of the moving contacts, it also effectively reduces the separation force between the contacts, and prevents the separation between the contacts of the relay in the high current working state, or even bonding. The occurrence of the relay is beneficial to ensure the working stability, safety and reliability of the relay and expand the application area of the work, which has strong practicability.
Description
技术领域technical field
本发明涉及电子控制器件技术领域，特别是一种带复合型动触头的高压直流继电器。The invention relates to the technical field of electronic control devices, in particular to a high-voltage direct-current relay with a composite movable contact.
背景技术Background technique
继电器是一种具有利用较小输入电流去控制较大电流输出功能的自动控制器件，也是一种当输入电流达到一定量值时触发工作、使输出电流产生跳跃式变化的“自动开关”，多用于机电一体化的自动控制系统中，能给使用继电器的系统或设备带来简化电路结构、确保安全运行、降低生产成本和一定的节能效果。现有高压直流继电器的基本结构如图1所示，主要包含有由激磁线圈11和动铁芯12构成的低压主控系统1，由纯铜质左右定触点21和由厚度为L的较薄型纯铜质条状动触片221充任的条状动触头22构成的高压被控系统2，一端固定设置在条状动触头22的中心位置上、另一端固设在动铁芯12轴心位置上、中间套设有压缩弹簧4的联动轴3。动铁芯12限位活动设置在激磁线圈11的中心位置上，当激磁线圈11中有电流通过时，动铁芯12在电磁力的作用下作轴向直线运动，带动联动轴3随同动铁芯12同步移动，驱使条状动触头22执行与左右定触点21紧密接触或分离的动作，从而控制负载电路电流的接通或断开。其缺点在于所述的左右动触点21和条状动触片22均由纯铜材料制成，在大电流工作状态下，当触点间由接触电阻的存在而产生的温升达到纯铜熔点时，容易产生局部熔化，而切断电流、降温时容易生成具有较强粘连力的熔核，致使动定触点分离不爽、甚至粘结，影响工作可靠性；且纯铜质较薄型条状动触片22在温升后容易变软，抗形变能力减弱,会从整体上影响继电器的工作稳定性和可靠工作寿命；同时也会导致影响使用继电器的系统或设备的工作可靠性和运行安全性，也由此导致增加继电器的报废率、增加日常维护保养的工作量和使用成本。所以，现有的高压直流继电器总体结构尚欠合理、无法满足控制大电流负载的正常使用要求等弊端，故从经济性和实用性角度考虑均欠理想。The relay is an automatic control device with the function of using a small input current to control a large current output. It is also an "automatic switch" that triggers work when the input current reaches a certain value and makes the output current jump. In the automatic control system of mechatronics, it can bring simplified circuit structure, ensure safe operation, reduce production cost and certain energy saving effect to the system or equipment using relay. The basic structure of the existing high-voltage DC relay is shown in Figure 1, which mainly includes a low-voltage main control system 1 composed of an exciting coil 11 and a moving iron core 12, a left and right fixed contact 21 made of pure copper, and a comparative The high-voltage controlled system 2 composed of the strip-shaped moving contact 22 that is made of thin pure copper strip-shaped moving contact piece 221 is fixed at the center of the strip-shaped moving contact 22 and the other end is fixed at the moving iron core 12 A linkage shaft 3 with a compression spring 4 is sheathed in the center of the axis. The limit movement of the moving iron core 12 is set on the center position of the exciting coil 11. When the current passes through the exciting coil 11, the moving iron core 12 moves axially and linearly under the action of the electromagnetic force, driving the linkage shaft 3 to move along with the moving iron. The core 12 moves synchronously, driving the strip-shaped movable contact 22 to perform the action of closely contacting or separating from the left and right fixed contacts 21, so as to control the connection or disconnection of the load circuit current. Its disadvantage is that the left and right moving contacts 21 and the strip moving contacts 22 are made of pure copper material. Under high current working conditions, when the temperature rise between the contacts due to the existence of contact resistance reaches the level of pure copper At the melting point, local melting is easy to occur, and when the current is cut off and the temperature is lowered, it is easy to form a nugget with strong adhesion force, which causes the movable and fixed contacts to separate and even bond, which affects the reliability of work; and the pure copper is thin strip The moving contact piece 22 is easy to become soft after temperature rise, and the anti-deformation ability is weakened, which will affect the working stability and reliable working life of the relay as a whole; at the same time, it will also affect the working reliability and operation safety of the system or equipment using the relay Sexuality, which also leads to an increase in the scrap rate of the relay, an increase in the workload of daily maintenance and use costs. Therefore, the overall structure of the existing high-voltage DC relays is not reasonable, and cannot meet the normal use requirements for controlling large current loads. Therefore, it is not ideal from the perspective of economy and practicability.
发明内容Contents of the invention
本发明的目的是要克服现有高压直流继电器所存在的不足，提供一种结构相对比较合理且科学、工作可靠且稳定性好，能满足大电流负载系统或设备控制需求的带复合型动触头的高压直流继电器。The purpose of the present invention is to overcome the shortcomings of the existing high-voltage DC relays, to provide a relatively reasonable and scientific structure, reliable work and good stability, which can meet the needs of large current load systems or equipment control. Head of the high-voltage DC relay.
本发明的带复合型动触头的高压直流继电器主体包含有由激磁线圈和动铁芯构成的低压主控系统，由左右定触点和动触头构成的高压被控系统，和一端固定设置在条状动触片的中心位置上、另一端固定设置在动铁芯轴心位置上、中间套设有压缩弹簧的联动轴，动触头由厚度为L的较薄型条状动触片充任，特征在于：所述的动触头主体呈复合型，包含有由厚度为L的较薄型条状动触片充任的传统动触头和由并列增加设置在条状动触片左右两侧、由覆盖设置在条状动触片背面上的铍铜簧片支承的辅助动触点，其中：所述的铍铜簧片由含铍量大于2%的高弹性强度、弹性滞后小的铍青铜合金材料制成，通过铆钉固定设置在条状动触片的背面上，其宽度与条状动触片的宽度相符、其长度与所述的左右定触点各自最外边沿点间的间距相符、其厚度为条状动触片厚度L的0.1-0.15倍；所述的辅助动触点由含铜量为10%-50%的钨铜粉末用冶金方法铸成、高温特性好的钨铜触点充任，其长度与所述的铍铜簧片的宽度相符、其宽度为铍铜簧片与条状动触片的长度之差的二分之一减除所述的铍铜簧片厚度之差，其高度为条状动触片厚度L的1.1-1.15倍。The main body of the high-voltage DC relay with composite moving contact of the present invention includes a low-voltage main control system composed of an exciting coil and a moving iron core, a high-voltage controlled system composed of left and right fixed contacts and moving contacts, and a fixedly arranged At the center of the strip-shaped moving contact piece, the other end is fixedly arranged at the axial center of the moving iron core, and a linkage shaft with a compression spring is set in the middle. The moving contact piece is a thin strip-shaped moving contact piece with a thickness of L. , characterized in that: the main body of the moving contact is composite, including a traditional moving contact with a thinner strip-shaped moving contact piece with a thickness of L and a side-by-side arrangement on the left and right sides of the strip-shaped moving contact piece, An auxiliary movable contact supported by a beryllium copper reed covered on the back of the strip-shaped movable contact piece, wherein: the beryllium copper reed is made of beryllium bronze with high elastic strength and small elastic hysteresis containing more than 2% beryllium Made of alloy material, fixed on the back of the strip-shaped moving contact by rivets, its width is consistent with the width of the strip-shaped moving contact, and its length is consistent with the distance between the outermost edge points of the left and right fixed contacts. , whose thickness is 0.1-0.15 times of the thickness L of the strip-shaped movable contact piece; the auxiliary movable contact is cast by metallurgical method from tungsten-copper powder with a copper content of 10%-50%, and has good high-temperature characteristics. The contact acts as a contact, and its length is consistent with the width of the beryllium copper reed, and its width is half of the difference between the length of the beryllium copper reed and the strip-shaped moving contact piece minus the thickness of the beryllium copper reed The difference is that its height is 1.1-1.15 times of the thickness L of the strip-shaped moving contact piece.
在装配状态下，所述的辅助动触点焊接设置在所述的铍铜簧片的左右端部上，所述的铍铜簧片通过铆钉铆接固定、覆盖设置在所述的条状动触片的背面上，两端具有细微弹性，所述的辅助动触点与所述的条状动触头呈并列状、相邻端面间存有宽度与所述的铍铜簧片厚度相符的缝隙、其工作面高于条状动触片 0.1 L -1.5L。In the assembled state, the auxiliary movable contact is welded on the left and right ends of the beryllium-copper reed, and the beryllium-copper reed is riveted and fixed by rivets to cover the strip-shaped movable contact. On the back of the sheet, both ends have slight elasticity, the auxiliary movable contact and the strip-shaped movable contact are juxtaposed, and there is a gap with a width consistent with the thickness of the beryllium copper reed between adjacent end faces , Its working surface is 0.1L-1.5L higher than the strip moving contact piece.
工作时，条状动触片和钨铜辅助动触点搭配构成复合型动触头取代传统的单一型动触头，当接通负载电路时，所述的辅助动触点先于条状动触片与左右定触点相接触、闭合负载电路，承受瞬间大电流的冲击，然后条状动触片与左右定触点相接触、参预正常的通电作业，对左右定触点起到保护作用；当断开负载电路时，条状动触片先于辅助动触点与左右定触点分离，而此时辅助动触点仍处于通电状态，故对条状动触头起到保护作用，触点间分离时产生的电弧全由辅助动触点承受，但由于在相同尺寸情况下钨的电阻大于铜的电阻，故在继电器正常通电工作状态下流过辅助动触点的电流要小于铜质条状动触头上的电流，所以分离时在辅助动触点上产生电弧的电流很小，电弧的破坏作用也小，故在确保条状动触头获得有效保护的同时，对钨铜辅助动触点的工作寿命影响极小，从整体上提高了继电器触点大电流工作时的承受力，从而提高继电器工作的稳定性和可靠工作寿命。When working, the strip-shaped moving contact piece and the tungsten-copper auxiliary moving contact are combined to form a composite moving contact to replace the traditional single-type moving contact. When the load circuit is connected, the auxiliary moving contact is prior to the strip moving contact. The contact piece is in contact with the left and right fixed contacts, closes the load circuit, and withstands the impact of the instantaneous high current, and then the strip-shaped moving contact piece is in contact with the left and right fixed contacts, participating in the normal power-on operation, and protecting the left and right fixed contacts ; When the load circuit is disconnected, the strip moving contact is separated from the left and right fixed contacts before the auxiliary moving contact, and at this time the auxiliary moving contact is still in the energized state, so it plays a protective role for the strip moving contact. The arc generated when the contacts are separated is all borne by the auxiliary movable contact, but because the resistance of tungsten is greater than that of copper under the same size, the current flowing through the auxiliary movable contact is smaller than that of copper when the relay is normally energized. The current on the strip-shaped moving contact, so the arc current generated on the auxiliary moving contact is very small during separation, and the destructive effect of the arc is also small. Therefore, while ensuring effective protection for the strip-shaped moving contact, the tungsten-copper auxiliary The impact on the working life of the moving contact is very small, which improves the bearing capacity of the relay contact when working with high current on the whole, thereby improving the stability and reliable working life of the relay.
基于上述构思的本发明带复合型动触头的高压直流继电器，由于在现有高压直流继电器常规结构的基础上，在条状动触头两端并列增加设置了钨铜辅助动触点，使继电器的动触头成为由常规条状动触头和钨铜辅助动触点构成的复合型，工作时辅助动触点先于条状动触头通电、后于条状动触头分离断电，两者协调工作，既能确保原有条状动触头的正常通电作业，使继电器保持正常工作，又能使原有条状动触头免受电路接通时瞬间大电流的冲击和电路断开时电弧的破坏性影响，在确保和延长条状动触头的可靠工作寿命的同时，还使继电器有效降低了触点间的分离力，杜绝继电器在大电流工作状态下触点间分离不爽、甚至粘结情况的发生，从而有利于确保继电器的工作稳定性和工作可靠性，使继电器的工作不受负载任何大小工作电流的限制，提高了工作适用面，同时也为使用本发明继电器的系统或设备的可靠工作和安全运行提供了技术保障。所有这些，都是本发明方案中的复合型动触头所带来的积极技术效果，解决了长期以来困扰高压直流继电器触点工作可靠性差、工作寿命不长、适用面有局限的一大难题，为具有能简化电路结构、能带来显著节能效果的高压直流继电器在高铁和新能源汽车上的应用扫除了屏障，实是是高压直流继电器制造领域的一大创新，明显具有很强的实用性和广阔的市场应用前景。Based on the above-mentioned idea, the high-voltage DC relay with composite movable contact of the present invention, on the basis of the conventional structure of the existing high-voltage DC relay, tungsten-copper auxiliary movable contacts are arranged side by side at both ends of the strip-shaped movable contact, so that The moving contact of the relay is a composite type consisting of a conventional strip-shaped moving contact and a tungsten-copper auxiliary moving contact. During operation, the auxiliary moving contact is energized before the strip-shaped moving contact, and then separated from the strip-shaped moving contact. , the two work in harmony, which can not only ensure the normal power-on operation of the original strip-shaped moving contact, keep the relay working normally, but also protect the original strip-shaped moving contact from the impact of the instantaneous large current when the circuit is turned on and the circuit The destructive effect of the arc when it is disconnected, while ensuring and extending the reliable working life of the strip moving contact, it also effectively reduces the separation force between the contacts of the relay, and prevents the separation of the contacts of the relay under high current working conditions Discomfort, or even the occurrence of sticking situations, thereby helping to ensure the working stability and working reliability of the relay, so that the work of the relay is not limited by the working current of any size of the load, which improves the work applicable surface, and also provides a guarantee for the use of the relay of the present invention. It provides a technical guarantee for the reliable work and safe operation of the system or equipment. All of these are the positive technical effects brought by the composite moving contact in the solution of the present invention, which solves the long-standing problems of poor reliability, short working life and limited application of high-voltage DC relay contacts. , has cleared the barriers for the application of high-voltage DC relays that can simplify the circuit structure and bring about significant energy-saving effects in high-speed rail and new energy vehicles. and broad market application prospects.
附图说明Description of drawings
图1是与本发明相关现有高压直流继电器的结构示意图；Fig. 1 is the structural representation of existing high voltage direct current relay related to the present invention;
图2是本发明实施例的基本结构示意图；Fig. 2 is a schematic diagram of the basic structure of an embodiment of the present invention;
图3是本发明实施例中复合型动触头的结构示意图。Fig. 3 is a schematic structural diagram of a composite movable contact in an embodiment of the present invention.
图中：In the picture:
1.低压主控系统 11.激磁线圈 12.动铁芯 2.高压被控系统1. Low-voltage main control system 11. Exciting coil 12. Moving iron core 2. High-voltage controlled system
21.左右定触点 22.动触头 221.条状动触片 222.铍铜簧片21. Left and right fixed contacts 22. Moving contacts 221. Strip moving contacts 222. Beryllium copper reeds
223辅助动触点 3.连动轴 4.压缩弹簧 5.缝隙 6.铆钉。223 Auxiliary moving contact 3. Linkage shaft 4. Compression spring 5. Gap 6. Rivet.
具体实施方式Detailed ways
下面结合附图和典型实施例对本发明作进一步说明。The present invention will be further described below in conjunction with the accompanying drawings and typical embodiments.
在图2中，本发明的带复合型动触头的高压直流继电器主体包含有由激磁线圈11和动铁芯12构成的低压主控系统1，由左右定触点21和动触头22构成的高压被控系统2，和一端固定设置在条状动触片221的中心位置上、另一端固定设置在动铁芯12轴心位置上、中间套设有压缩弹簧4的联动轴3，动触头22由厚度为L的较薄型条状动触片221充任，特征在于：所述的动触头22主体呈复合型，包含有由厚度为L的较薄型条状动触片221充任的传统动触头22和由并列增加设置在条状动触片221左右两侧、由覆盖设置在条状动触片221背面上的铍铜簧片222支承的辅助动触点223，其中：所述的铍铜簧片222由含铍量大于2%的高弹性强度、弹性滞后小的铍青铜合金材料制成，通过铆钉6固定设置在条状动触片221的背面上，其宽度与条状动触片221的宽度相符、其长度与所述的左右定触点21各自最外边沿点间的间距相符、其厚度为条状动触片221厚度L的0.1-0.15倍；所述的辅助动触点223由含铜量为10%-50%的钨铜粉末用冶金方法铸成、高温特性好的钨铜触点充任，其长度与所述的铍铜簧片222的宽度相符、其宽度为铍铜簧片222与条状动触片221的长度之差的二分之一减除所述的铍铜簧片222厚度之差，其高度为条状动触片221厚度L的1.1-1.15倍。In Fig. 2, the main body of the high-voltage DC relay with composite moving contacts of the present invention includes a low-voltage main control system 1 composed of an excitation coil 11 and a moving iron core 12, and is composed of left and right fixed contacts 21 and moving contacts 22 The high-voltage controlled system 2, and one end is fixedly arranged on the central position of the strip-shaped moving contact piece 221, the other end is fixedly arranged on the axial center position of the moving iron core 12, and the linkage shaft 3 is set with a compression spring 4 in the middle. The contact 22 is served by a thinner strip-shaped movable contact piece 221 with a thickness of L. The feature is that the main body of the movable contact 22 is a composite type, including a thinner strip-shaped movable contact piece 221 with a thickness of L. The traditional movable contact 22 and the auxiliary movable contact 223 are arranged side by side on the left and right sides of the strip movable contact 221 and supported by the beryllium copper reed 222 arranged on the back of the strip movable contact 221, wherein: The above-mentioned beryllium copper reed 222 is made of a beryllium bronze alloy material with high elastic strength and little elastic hysteresis containing more than 2% of beryllium. The width of the strip-shaped movable contact piece 221 is consistent, its length is consistent with the distance between the outermost edge points of the left and right fixed contacts 21, and its thickness is 0.1-0.15 times the thickness L of the strip-shaped movable contact piece 221; The auxiliary movable contact 223 is made of tungsten-copper powder with a copper content of 10%-50% cast by metallurgical methods, and has good high-temperature characteristics. Its length is consistent with the width of the beryllium-copper reed 222. Its width is 1/2 of the length difference between the beryllium copper reed 222 and the strip movable contact piece 221 minus the difference in the thickness of the beryllium copper reed 222, and its height is the thickness L of the strip movable contact piece 221. 1.1-1.15 times.
在装配状态下，所述的辅助动触点223焊接设置在所述的铍铜簧片222的左右端部上，所述的铍铜簧片222通过铆钉6铆接固定、覆盖设置在所述的条状动触片221的背面上，两端具有细微弹性，所述的辅助动触点223与所述的条状动触头22呈并列状、相邻端面间存有宽度与所述的铍铜簧片222厚度相符的缝隙5、其工作面高于条状动触片221 0.1 L -1.5L。In the assembled state, the auxiliary movable contact 223 is welded and arranged on the left and right ends of the said beryllium copper reed 222, and the said beryllium copper reed 222 is riveted and fixed by the rivet 6, covering and arranged on the said beryllium copper reed. On the back side of the strip-shaped movable contact piece 221, both ends have slight elasticity, the auxiliary movable contact 223 and the described strip-shaped movable contact 22 are juxtaposed, and there is a width between adjacent end faces that is the same as that of the beryllium. The slit 5 with the same thickness of the copper reed 222 has a working surface higher than the strip-shaped movable contact piece 221 by 0.1L-1.5L.
工作时，条状动触片221和钨铜辅助动触点223搭配构成复合型动触头取代传统的单一型动触头22，当接通负载电路时，所述的辅助动触点223先于条状动触片221与左右定触点21相接触、闭合负载电路，承受瞬间大电流的冲击，然后条状动触片221与左右定触点21相接触、参预正常的通电作业，对左右定触点21起到保护作用；当断开负载电路时，条状动触片221先于辅助动触点223与左右定触点21分离，而此时辅助动触点223仍处于通电状态，故对条状动触头22起到保护作用，触点间分离时产生的电弧全由辅助动触点223承受，但由于在相同尺寸情况下钨的电阻大于铜的电阻，故在继电器正常通电工作状态下流过辅助动触点223的电流要小于铜质条状动触头22上的电流，所以分离时在辅助动触点223上产生电弧的电流很小，电弧的破坏作用也小，故在确保条状动触头22获得有效保护的同时，对钨铜辅助动触点223的工作寿命影响极小，从整体上提高了继电器触点大电流工作时的承受力，从而提高继电器工作的稳定性和可靠工作寿命。When working, the strip movable contact 221 and the tungsten-copper auxiliary movable contact 223 are combined to form a composite movable contact to replace the traditional single movable contact 22. When the load circuit is connected, the auxiliary movable contact 223 first The strip-shaped movable contact piece 221 is in contact with the left and right fixed contacts 21, closes the load circuit, and withstands the impact of an instantaneous large current, and then the strip-shaped movable contact piece 221 contacts with the left and right fixed contacts 21, and participates in normal power-on operations. The left and right fixed contacts 21 play a protective role; when the load circuit is disconnected, the strip-shaped movable contact piece 221 is separated from the left and right fixed contacts 21 before the auxiliary movable contact 223, and at this time the auxiliary movable contact 223 is still in the energized state , so it plays a protective role for the strip moving contact 22, and the arc generated when the contacts are separated is completely borne by the auxiliary moving contact 223. The current flowing through the auxiliary movable contact 223 in the energized working state is smaller than the current on the copper strip movable contact 22, so the electric current generated on the auxiliary movable contact 223 during separation is very small, and the destructive effect of the arc is also small. Therefore, while ensuring the effective protection of the strip-shaped movable contact 22, it has a minimal impact on the working life of the tungsten-copper auxiliary movable contact 223, which improves the bearing capacity of the relay contact when it is working with a large current as a whole, thereby improving the working life of the relay. Stability and reliable working life.
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| CN201810052685.2A CN107978490A (en) | 2018-01-19 | 2018-01-19 | A High Voltage DC Relay with Composite Moving Contact |
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Cited By (1)
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| CN114365250A (en) * | 2019-09-13 | 2022-04-15 | 田中贵金属工业株式会社 | DC high-voltage relay and contact material for DC high-voltage relay |
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Application publication date: 20180501 |