CN105405686A - Switching device - Google Patents
Switching device Download PDFInfo
- Publication number
- CN105405686A CN105405686A CN201510918699.4A CN201510918699A CN105405686A CN 105405686 A CN105405686 A CN 105405686A CN 201510918699 A CN201510918699 A CN 201510918699A CN 105405686 A CN105405686 A CN 105405686A
- Authority
- CN
- China
- Prior art keywords
- contact
- guide rod
- fixed contact
- magnetic conductor
- switching device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/50—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position
- H01H1/54—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position by magnetic force
Landscapes
- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
The invention relates to a switching device, belonging to the technical field of low-voltage electrical appliances. The switching device comprises a pair of movable contact and fixed contact, an operating mechanism and a shell, wherein the movable contact and the fixed contact are matched with each other; the operating mechanism acts on the movable contact so as to realize circuit switch-on and switch-off operations; the shell is used for containing the above devices; the movable contact comprises a movable contact guide rod and a movable contact point arranged on the movable contact guide rod; the fixed contact comprises a fixed contact guide rod and a fixed contact point arranged on the fixed contact guide rod; when being contacted, the movable contact point and the fixed contact point form a contact area; the switching device is characterized by further comprising a first magnetic conductor, the cross section of which is U-shaped; the first magnetic conductor is arranged near the contact area; furthermore, the opening of the first magnetic conductor is towards the movable contact guide rod; and the movable contact guide rod and the fixed contact guide rod are parallel to each other when the movable contact point and the fixed contact point are contacted. According to the invention, the contact pressure between the movable contact and the fixed contact can be increased; therefore, the switching device can bear short-circuit current for a certain time; namely, when the short-circuit current passes through the movable contact and the fixed contact, the movable contact point and the fixed contact point still can be contacted and not separated; and thus, the reliability and the continuity for power supply can be ensured.
Description
Technical field
The invention belongs to low voltage electrical apparatus technology field, be specifically related to a kind of switching device, it can bear certain specified short time withstand current.
Background technology
Switching device can cut off and connect load circuit, can also disengagement failure circuit, can match when system jam with protective device and automatics, and rapid disengagement failure electric current to prevent fault spread, thus ensures system safety operation.Along with the development of level of power, new technology, new technology constantly occur, the performance of switching device has had large increase, in the use occasion that some is special, user it is also proposed higher instructions for use to switching device, such as require that switching device has certain short circuit withstand capacity, namely switching device can carry the short circuit current of a period of time, guarantees reliability and the continuity of power supply.
Switching device is generally made up of contact, arc-control device, operating mechanism etc., and wherein contact comprises again moving contact and fixed contact, and dynamic and static contacts mates energy realizing circuit is connected or disjunction.Contact pressure is an important parameter of switching device, when fault current passes through the major loop of switching device as short circuit current, very large electrodynamic repulsion force can be produced between dynamic and static contact, if contact pressure is less than this electrodynamic repulsion force, then dynamic and static contact is shaken up and down and causes electric arc, then causes contact burning.Therefore, when designing switching device, should be noted that and make contact pressure meet reliable contacts between dynamic and static contact to avoid the requirement of shaking.
In view of above-mentioned prior art, be necessary to be improved the structure of existing switching device.For this reason, the applicant has done useful design, and technical scheme described below produces under this background.
Summary of the invention
The object of the present invention is to provide a kind of switching device with short circuit withstand capacity, it can compensate the electrodynamic repulsion force between dynamic and static contact, and structure is simple, easily manufactured, with low cost.
The object of the invention is to reach like this, a kind of switching device, comprise the moving contact cooperatively interacted for a pair, fixed contact, act on operating mechanism that moving contact operates with realizing circuit joint weldment and the shell for accommodating said apparatus, described moving contact comprises moving contact guide rod and is arranged on the moving contact on moving contact guide rod, described fixed contact comprises fixed contact guide rod and is arranged on the fixed contact on fixed contact guide rod, moving contact, during fixed contact contact, both form contact area, it is characterized in that: described switching device also comprises the first magnetic conductor that shape of cross section is U-shaped, the first described magnetic conductor is arranged near contact area, and its opening is towards moving contact guide rod, moving contact guide rod and fixed contact guide rod are at moving contact, be parallel to each other both during fixed contact contact.
In a specific embodiment of the present invention, described switching device also comprises flat second magnetic conductor, fix with the bottom of the first magnetic conductor in the die cavity that one end of the length direction of the second described magnetic conductor extends to the first magnetic conductor, the other end and the described fixed contact guide rod of the length direction of the second magnetic conductor are fixed, and the fixing point at above-mentioned two places lays respectively at the left and right sides of fixed contact.
In another specific embodiment of the present invention, the first described magnetic conductor comprises the sidewall facing each other for a pair and be arranged in parallel and the bottom connecting above-mentioned two sidewalls, sidewall divides and is located at moving contact guide rod both sides, bottom is positioned at below moving contact guide rod, and fixed contact is partly or wholly positioned at the die cavity of the first magnetic conductor.
The present invention compared with prior art, the beneficial effect had is: moving contact guide rod and fixed contact guide rod are dynamic, two guide rods be parallel to each other due to both formations during fixed contact contact and two guide rods flow through the electric current of equidirectional and the electronic suction that produces, owing to having set up the first magnetic conductor, enhance the magnetic field of contact area, further enhancing dynamic, electronic suction between quiet guide rod, and moving contact is to the cephalomotor power of stationary contact, both are jointly to dynamic, electrodynamic repulsion force between fixed contact compensates, can improve dynamic thus, contact pressure between fixed contact, make switching device can carry the short circuit current of a period of time, namely move, on fixed contact during short circuit current flow, dynamic, fixed contact still can keep in touch and not be separated, guarantee reliability and the continuity of power supply.
Accompanying drawing explanation
Fig. 1 is the cutaway view of switching device of the present invention.
Fig. 2 is the end view of switching device of the present invention.
Fig. 3 is the assembling schematic diagram between fixed contact of the present invention, the first magnetic conductor and the second magnetic conductor.
In figure: 1. moving contact, 11. moving contact guide rods, 12. moving contacts; 2. fixed contact, 21. fixed contact guide rods, 22. fixed contacts; 3. connecting rod, 341. jointed shafts, 35. lower links, 36. rotating shafts, 37. Handlesets, 38. main springs in operating mechanism, 30. supports, 31. first snap closes, 32. second snap closes, 33. trippings, 34.; 4. shell; 5. bottom the first magnetic conductor, 51., 52. openings, 53. sidewalls; 6. the second magnetic conductor, 61. one end, 62. other ends.
Embodiment
Applicant will describe in detail the specific embodiment of the present invention below by reference to the accompanying drawings; but applicant is not the restriction to technical scheme to the description of embodiment, any changing in the form rather than substance according to the present invention's design all should be considered as protection scope of the present invention.
Refer to Fig. 1 and Fig. 2, the present invention relates to a kind of switching device, comprise cooperatively interact for a pair moving contact 1, fixed contact 2, act on operating mechanism 3 that moving contact 1 operates with realizing circuit joint weldment and the shell 4 for accommodating said apparatus.The moving contact 12 that described moving contact 1 comprises moving contact guide rod 11 and is arranged on moving contact guide rod 11, the fixed contact 22 that described fixed contact 2 comprises fixed contact guide rod 21 and is arranged on fixed contact guide rod 21, when moving contact 12, fixed contact 22 contact, form contact area between dynamic and static contact, moving contact guide rod 11 and both fixed contact guide rods 21 are parallel to each other.Described operating mechanism 3 comprises support 30, first snap close 31, second snap close 32, tripping 33, upper connecting rod 34, lower link 35, rotating shaft 36, Handleset 37 and main spring 38, first snap close 31, second snap close 32 and tripping 33 are hinged on support 30 respectively, tripping 33 is hinged with upper connecting rod 34, upper connecting rod 34 is hinged with lower link 35 by a jointed shaft 341 again, one end of main spring 38 is hung on Handleset 37, the other end is hung on described jointed shaft 341, and lower link 35 is hinged with rotating shaft 36 again.Rotating shaft 36, for installing moving contact 1, is provided with the touch spring for providing closing force between moving contact 12, fixed contact 22 between moving contact 1 and rotating shaft 36.When switching device is in normal "on" position, second snap close 32 respectively with the first snap close 31 and tripping 33 hasp, upper connecting rod 34, lower link 35 and rotating shaft 36 form stable quadric chain, when carrying out switch separating brake, stir Handleset 37 to open position action, Handleset 37 drives main spring 38 action, upper connecting rod 34 rotates under the pulling force effect of main spring 38, drive lower link 35 action, rotating shaft 36 is rotated thereupon, make moving contact 12, fixed contact 22 is separated, finally arrive gate-dividing state.
Refer to Fig. 3 and composition graphs 1 and Fig. 2, described switching device also comprises the first magnetic conductor 5 that shape of cross section is U-shaped, and the first described magnetic conductor 5 is arranged near contact area, and its opening 52 is towards moving contact guide rod 11.First magnetic conductor 5 comprises the sidewall 53 facing each other for a pair and be arranged in parallel and the bottom 51 connecting above-mentioned two sidewalls 53, sidewall 53 points is located at moving contact guide rod 11 both sides, bottom 51 is positioned at below moving contact guide rod 11, and, fixed contact 22 is partly or wholly positioned at the die cavity of the first magnetic conductor 5, the internal face of sidewall 53 and moving contact 12, fixed contact 22 are close as far as possible, but can not interfere the action of moving contact 12.The depth of cavity of the first magnetic conductor 5, namely from shown in distance h(Fig. 2 of bottom 51 to opening 52), be preferably when arranging: after the first magnetic conductor 5 assemble, when the position at its opening 52 place corresponds to moving contact 12, fixed contact 22 contacts closed, moving contact guide rod 11 thickness a(Fig. 2 is shown) the height and position at a half thickness place.
The assembling mode of the first described magnetic conductor 5 has multiple, and such as, can be that groove is offered in corresponding position on shell 4, the first magnetic conductor 5 directly puts into this groove, and then assembles fixed contact 2.In the present embodiment, the first magnetic conductor 5 completes assembling by flat second magnetic conductor 6.Fix by rivet with the bottom 51 of the first magnetic conductor 5 in the die cavity that one end 61 of the length direction of the second described magnetic conductor 6 extends to the first magnetic conductor 5, the other end 62 of the length direction of the second magnetic conductor 6 is fixing by riveting with described fixed contact guide rod 21, and the fixing point at above-mentioned two places lays respectively at the left and right sides of fixed contact 22.The second described magnetic conductor 6, except locating the first magnetic conductor 5, can also strengthen the magnetic field bottom fixed contact guide rod 21.
Please continue see Fig. 2, when switching device closes a floodgate, electric current flows to moving contact 1 from fixed contact 2, produces magnetic field simultaneously.Due to the existence of the first magnetic conductor 5, originally disperse aerial magnetic field to be concentrated to the first magnetic conductor 5 inner, and circulate near moving contact 1.The magnetic direction at opening 52 place of the first magnetic conductor 5 is that vertical paper is outside, the electric current be in this magnetic field produces the power that moving contact 1 is moved to fixed contact 2 on moving contact 1, the electrodynamic repulsion force be made up of Hall nurse power is produced by this between moving contact 12, fixed contact 22, described moving contact guide rod 11 is parallel to each other when contacting at moving contact 12, fixed contact 22 with fixed contact guide rod 21, owing to flowing through the electric current of equidirectional, produce electronic suction to each other.The present invention is owing to moving, fixed contact 12, during 22 closed contact, moving contact guide rod 11 and fixed contact guide rod 21 form two guide rods that are parallel to each other flowing through equidirectional electric current, electronic suction is produced between moving contact 1 and fixed contact 2, simultaneously, because the present invention has set up the first magnetic conductor 5, enhance the magnetic field near contact area, the electric current be in this magnetic field produces the power that moving contact 1 is moved to fixed contact 2 on moving contact 1, namely further enhancing dynamic, fixed contact 1, electronic suction between 2, above-mentioned two kinds of measures are jointly to moving contact 12, electrodynamic repulsion force between fixed contact 22 compensates, which thereby enhance moving contact 1, contact pressure between fixed contact 2, make switching device can carry the short circuit current of a period of time, i.e. moving contact 1, on fixed contact 2 during short circuit current flow, moving contact 12, fixed contact 22 still can keep in touch and not be separated, guarantee reliability and the continuity of power supply.
For considering the manufacturability of parts, the first magnetic conductor 5 also can adopt two panels shape of cross section to be that the mode of the mutual cutting ferrule of thin plate of U-shaped realizes, and the sidewall 53 required for formation and the thickness of bottom 51, reduce the processing cost of mould.
In sum, technical scheme provided by the invention overcomes the shortcoming in prior art, reaches goal of the invention, embodies the technique effect described in applicant.
Claims (3)
1.
a kind of switching device, comprise the moving contact (1) cooperatively interacted for a pair, fixed contact (2), act on operating mechanism (3) that moving contact (1) operates with realizing circuit joint weldment and the shell (4) for accommodating said apparatus, described moving contact (1) comprises moving contact guide rod (11) and is arranged on the moving contact (12) on moving contact guide rod (11), described fixed contact (2) comprises fixed contact guide rod (21) and is arranged on the fixed contact (22) on fixed contact guide rod (21), moving contact (12), during fixed contact (22) contact, both form contact area, it is characterized in that: described switching device also comprises the first magnetic conductor (5) that shape of cross section is U-shaped, described the first magnetic conductor (5) is arranged near contact area, and its opening (52) is towards moving contact guide rod (11), moving contact guide rod (11) and fixed contact guide rod (21) are in moving contact (12), be parallel to each other both during fixed contact (22) contact.
2.
a kind of switching device according to claim 1, it is characterized in that described the first magnetic conductor (5) comprises the sidewall (53) facing each other for a pair and be arranged in parallel and the bottom (51) connecting above-mentioned two sidewalls (53), sidewall (53) point is located at moving contact guide rod (11) both sides, bottom (51) is positioned at moving contact guide rod (11) below, and fixed contact (22) is partly or wholly positioned at the die cavity of the first magnetic conductor (5).
3.
a kind of switching device according to claim 1 and 2, it is characterized in that described switching device also comprises flat second magnetic conductor (6), fix with the bottom (51) of the first magnetic conductor (5) in the die cavity that one end of the length direction of described the second magnetic conductor (6) extends to the first magnetic conductor (5), the other end of the length direction of the second magnetic conductor (6) and described fixed contact guide rod (21) are fixed, and the fixing point at above-mentioned two places lays respectively at the left and right sides of fixed contact (22).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510918699.4A CN105405686B (en) | 2015-12-14 | 2015-12-14 | A kind of switching device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510918699.4A CN105405686B (en) | 2015-12-14 | 2015-12-14 | A kind of switching device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105405686A true CN105405686A (en) | 2016-03-16 |
| CN105405686B CN105405686B (en) | 2017-12-29 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510918699.4A Active CN105405686B (en) | 2015-12-14 | 2015-12-14 | A kind of switching device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105405686B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3560683A (en) * | 1968-01-24 | 1971-02-02 | Westinghouse Electric Corp | Circuit breaker with improved contact structure |
| FR2283541A1 (en) * | 1973-07-30 | 1976-03-26 | Baco Const Elect | Circuit breaker with thermal release and magnetic relay - has coil spring to provide contact bias and quick separation |
| JPH02132716A (en) * | 1988-11-12 | 1990-05-22 | Toshiba Corp | Circuit breaker |
| CN101022064A (en) * | 2007-03-08 | 2007-08-22 | 常熟开关制造有限公司(原常熟开关厂） | Plastic case circuit breaker |
| CN101315852A (en) * | 2007-05-29 | 2008-12-03 | 浙江正泰电器股份有限公司 | Contact system of plastic case breaker |
| CN102592906A (en) * | 2012-02-22 | 2012-07-18 | 西安交通大学 | Medium-pressure and high-capacity DC circuit breaker contact terminal system for improving short time endurance capability |
| CN204289305U (en) * | 2014-12-25 | 2015-04-22 | 常熟开关制造有限公司(原常熟开关厂） | The contact system of low-voltage circuit breaker |
| CN205194541U (en) * | 2015-12-14 | 2016-04-27 | 常熟开关制造有限公司(原常熟开关厂） | Switch device |
-
2015
- 2015-12-14 CN CN201510918699.4A patent/CN105405686B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3560683A (en) * | 1968-01-24 | 1971-02-02 | Westinghouse Electric Corp | Circuit breaker with improved contact structure |
| FR2283541A1 (en) * | 1973-07-30 | 1976-03-26 | Baco Const Elect | Circuit breaker with thermal release and magnetic relay - has coil spring to provide contact bias and quick separation |
| JPH02132716A (en) * | 1988-11-12 | 1990-05-22 | Toshiba Corp | Circuit breaker |
| CN101022064A (en) * | 2007-03-08 | 2007-08-22 | 常熟开关制造有限公司(原常熟开关厂） | Plastic case circuit breaker |
| CN101315852A (en) * | 2007-05-29 | 2008-12-03 | 浙江正泰电器股份有限公司 | Contact system of plastic case breaker |
| CN102592906A (en) * | 2012-02-22 | 2012-07-18 | 西安交通大学 | Medium-pressure and high-capacity DC circuit breaker contact terminal system for improving short time endurance capability |
| CN204289305U (en) * | 2014-12-25 | 2015-04-22 | 常熟开关制造有限公司(原常熟开关厂） | The contact system of low-voltage circuit breaker |
| CN205194541U (en) * | 2015-12-14 | 2016-04-27 | 常熟开关制造有限公司(原常熟开关厂） | Switch device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105405686B (en) | 2017-12-29 |
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