CN112802722A - Static contact structure, contact system and circuit breaker - Google Patents
Static contact structure, contact system and circuit breaker Download PDFInfo
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- CN112802722A CN112802722A CN202110112733.4A CN202110112733A CN112802722A CN 112802722 A CN112802722 A CN 112802722A CN 202110112733 A CN202110112733 A CN 202110112733A CN 112802722 A CN112802722 A CN 112802722A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
- H01H73/02—Details
- H01H73/04—Contacts
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Abstract
The invention relates to the technical field of circuit breakers, in particular to a static contact structure, a contact system and a circuit breaker, wherein the static contact structure comprises a body part, the body part comprises at least one group of main body parts and at least two shunt parts, any group of main body parts comprises two connecting parts which are opposite and arranged at intervals, and the shunt parts are arranged between the two connecting parts side by side and are respectively connected with the two connecting parts; the contact part is connected with the connecting part of the main body part close to the moving contact and can be contacted and conducted with the moving contact to form a conductive loop; when current passes through the conductive loop, the current flowing through all the shunt parts and the moving contact has the same direction and is opposite to the direction of the current flowing through the contact part; electrodynamic force F received by moving contactLEqual to the electric repulsion F of the contact part to the moving contactL1Electric attraction force F to moving contact with all shunt partsL2iSum of FL＝FL1+FL21+FL22+…+FL2i(ii) a Wherein i is an integer of 2 or more. Improve short-time tolerance and is suitable for selective environmental protection.
Description
Technical Field
The invention belongs to the technical field of circuit breakers, and particularly relates to a static contact structure, a contact system and a circuit breaker.
Background
A circuit breaker is a switching device capable of making, carrying and breaking a current of a normal circuit within a predetermined time, and also capable of carrying and breaking a current under an abnormal circuit condition such as an overload, a short circuit, an undervoltage, and a single-phase ground fault. With the development of science and technology, the living standard of people is increasingly improved, the power consumption demand is increased, the requirement on a circuit breaker playing a protection role in a circuit is higher and higher, and the circuit breaker is expected to have small volume and light weight and can break larger electricity.
The circuit breaker is internally provided with a contact system which can execute on-off operation and is composed of a moving contact and a fixed contact. The moving contact and the static contact of the existing common contact system are arranged at one end of the static contact and are approximately parallel, the current direction of the end of the static contact, which is provided with the static contact, is opposite to the current direction of the moving contact, and when the current passes through the moving contact, the moving contact is separated from the static contact by electric repulsion force to generate electric arc, so that the further rise of short-circuit current is limited. Then the electromagnetic protection mechanism of the circuit breaker can drive the operation mechanism to act, so that the circuit breaker is tripped and separated, arcs are extinguished, and short-circuit fault current is cut off. However, when the existing contact system has a short-circuit fault, the peak value of the short-circuit current often reaches hundreds of kiloamperes, so that a large electric repulsion force is generated between a moving contact and a static contact when the large current flows through a conductive loop of the circuit breaker, the moving contact and the static contact are quickly repelled, the short-time endurance capability is low, and the expected effect is difficult to achieve in an environment needing selective protection due to the fact that the repulsion is too early.
Disclosure of Invention
The invention aims to solve the technical problem that the short-time tolerance of a movable contact and a fixed contact of a circuit breaker in the prior art is low, and provides a static contact structure capable of improving the short-time tolerance, a contact system with the static contact structure and the circuit breaker.
Therefore, an object of the present invention is to provide a static contact structure, including:
the body part comprises at least one group of main body parts and at least two shunt parts, each group of main body parts comprises two connecting parts which are opposite and arranged at intervals, and the shunt parts are arranged between the two connecting parts side by side and are respectively connected with the two connecting parts;
the contact part is connected with the connecting part of the main body part close to the moving contact and can be in contact with the moving contact to form a conductive loop;
when current passes through the conductive loop, the current flowing through all the shunt parts and the moving contact is in the same direction and opposite to the direction of the current flowing through the contact part;
electric force F borne by the moving contactLEqual to the electric repulsion F of the contact part to the moving contactL1The electric attraction force F of all the shunt parts to the moving contactL2iThe sum of the total weight of the components,
FL＝FL1+FL21+FL22+…+FL2i(ii) a Wherein i is an integer of 2 or more.
Preferably, in the static contact structure, at least two shunt parts are connected in parallel and connected in series with the main body part.
Preferably, in the static contact structure, the main body portion includes at least two groups, and the at least two groups of main body portions are connected in parallel;
at least two groups of main body parts are arranged at intervals to form an avoiding space for the moving contact and the contact part to be switched on and off.
Preferably, in the static contact structure, any one group of the main body portions is provided with at least three shunt portions, and the resistance of at least one shunt portion of the at least three shunt portions is different from the resistance of the other shunt portions.
Preferably, the static contact structure has the same resistance for all the shunt parts.
Preferably, in the static contact structure, a bending portion bending towards the shunt portion is formed at one end of the contact portion away from the end connected with the connecting portion; and/or
All the shunting parts are arranged in parallel and are perpendicular to the connecting parts.
Preferably, the static contact structure further includes;
the joint part is arranged on the connecting part at one end of the main body part, which is far away from the movable contact, the extending direction of the joint part is consistent with that of the contact part, and the joint part and the contact part extend towards the direction far away from the movable contact;
the direction of current flowing through the joint part is the same as that of current flowing through the shunt part and the movable contact part, and is opposite to that of current flowing through the contact part.
Preferably, in the static contact structure, the main body portion, the shunt portion, the contact portion, and the joint portion are integrally formed.
Another object of the present invention is to provide a contact system, which includes a movable contact component and a stationary contact component that can be contacted and conducted, where the stationary contact component includes any one of the above stationary contact structures.
It is also an object of the invention to provide a circuit breaker comprising said contact system.
The technical scheme of the invention has the following advantages:
1. according to the static contact structure provided by the invention, the shunting part is arranged in the static contact structure, the current direction of the shunting part is the same as that of the moving contact and is opposite to that of the contact part, according to the principle that the same-direction current of a conductor is attracted and the opposite-direction current is repelled, when a short-circuit fault occurs in a conductive loop, the moving contact is subjected to the electric attraction of the shunting part to the moving contact and the electric repulsion of the contact part to the moving contact, the electrodynamic force is in direct proportion to the square of the current according to an electrodynamic force formula, and due to the arrangement of the shunting part, the electric attraction of all the shunting parts to the moving contact is compared with the electric attraction when the shunting part is not arranged, so that the time for segmenting the moving contact and the static contact is delayed, the short-time tolerance is improved, and the.
2. In the static contact structure provided by the invention, a bending part which is bent towards the direction of the shunt part is formed at one end of the contact part, which is far away from the end connected with the connecting part. Through the arrangement of the bending part, the arc can be helped to move upwards rapidly, and the ablation on the contact is reduced. The contact system is well protected.
3. The static contact structure provided by the invention also comprises a joint part, and the static contact structure can be fixedly arranged in the shell of the circuit breaker through the joint part by the arrangement of the joint part.
4. The invention provides a static contact structure, wherein a main body part, a shunt part, a contact part and a joint part are integrally formed. The processing and manufacturing are convenient, the manufacturing cost is low, and the integral structure and the conduction performance of the static contact structure are reliable.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural view of a stationary contact structure in embodiment 1 of the present invention;
fig. 2 is a schematic structural view of a moving contact of the contact system in embodiment 2 of the present invention when the moving contact is separated from a stationary contact by an electric power.
Description of reference numerals:
1-stationary contact configuration; 10-a body portion; 11-a body portion; 111-a connecting portion; 12-a flow splitting section; 13-a contact portion; 14-a joint portion;
2-moving contact.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The static contact structure 1 of the present embodiment, as shown in fig. 1 to 2, includes a body portion 10, a contact portion 13, and a connector portion 14. The main body 10 includes at least one set of main body 11 and at least two shunt portions 12, each set of main body 11 includes two connecting portions 111 disposed opposite to each other and at an interval, that is, two vertical portions disposed at a vertical interval as shown in fig. 1, the two shunt portions 12 are disposed side by side between the two connecting portions 111 and are respectively connected to the two connecting portions 111, and the two shunt portions 12 are two horizontal portions disposed at a horizontal interval between the connecting portions 111 of the two vertical portions as shown in fig. 1. The contact portion 13 is connected to the connecting portion 111 of the main body portion 11 close to the movable contact 2, that is, a laterally extending portion extending leftward below the connecting portion 111 at the right end of the fixed contact structure 1 shown in fig. 2 can be in contact with the movable contact 2 to form a conductive loop, that is, a stationary contact is disposed on the contact portion 13 and is used for being connected to a movable contact on the movable contact 2 to implement a main loop conduction. The joint part 14 is disposed on the connecting part 111 of the main body 11 away from the movable contact 2, that is, below the left side of the connecting part 111 at the left end of the fixed contact structure 1 shown in fig. 2, and the joint part 14 is provided with a through hole for connecting the fixed contact structure 1 with a housing (not shown) of a circuit breaker so as to be fixedly mounted in the housing. When current flows through the conductive loop, the current flowing through all the shunt parts 12 and the movable contact 2 has the same direction and is opposite to the current flowing through the contact part 13. Specifically, as shown in fig. 2, the current flows from the joint portion 14 to the left connecting portion 111 and flows to the two shunt portions 12, and then flows from the right connecting portion 111 to the contact portion 13, so that the current direction changes, the current flows from the fixed contact to the movable contact 2 through the movable contact, and the current direction changes again, that is, the current direction on the movable contact 2 is the same as the current direction flowing through the joint portion 14 and the shunt portion 12. The electromotive force is divided into an electromotive repulsive force and an electromotive attractive force. The moving contact 2 of this application receives static contact structure 1 simultaneously to the electronic repulsion and the electronic suction of moving contact 2. In particular, compoundsWhen the switch is switched on, the movable contact 2 is positioned between the contact part 13 and the shunt part 12. According to the mutual attraction of the same-direction currents and the mutual repulsion of the opposite-direction currents of the conductors, all the shunt parts 12 generate electric attraction force on the moving contact 2, the contact parts 13 generate electric repulsion force on the moving contact 2, and the directions of the electric attraction force and the electric repulsion force are the same and are upward, namely the electric force F borne by the moving contact 2 isLEqual to the electric repulsion F of the contact part 13 to the moving contact 2L1The electric attraction force F of all the shunt parts 12 to the moving contact 2L2iSum of FL＝FL1+FL21+FL22+…+FL2i(ii) a Wherein i is an integer of 2 or more.
According to the electrodynamic equation:
in the formula of0Represents the permeability in a vacuum environment; k represents the conductive loop coefficient; i denotes the current of the conductive loop.
That is, the electromotive force is proportional to the square of the current. This application is through setting up two at least reposition of redundant personnel parts 12, utilize reposition of redundant personnel part 12 to shunt the electric current in the conductive loop, the electric current of every reposition of redundant personnel part 12 all is less than the electric current in the total conductive loop, thereby make every reposition of redundant personnel part 12 all be less than the electrodynamic force of somatic part 10 to moving contact 2 when not setting up reposition of redundant personnel part 12 to moving contact 2, the sum of all reposition of redundant personnel parts 12 is also less than the electrodynamic force sum of somatic part 10 to moving contact 2 when not setting up reposition of redundant personnel part 12 simultaneously.
Specifically, as shown in fig. 1, the main body 10 is provided with two shunt parts 12, two shunt parts 12 are vertically arranged in parallel and at intervals between two connecting parts 111 vertically arranged at intervals on the left and right, and the two shunt parts 12 are arranged in parallel and are connected in series with the two connecting parts 111 of the main body 11 to form a main conductive circuit. If the resistances of the two shunts 12 are the same, the current flowing through the main conductive loop is In, and the voltages are the same according to the parallel circuit, the resistances are the same, and the currents are also the same, so that the current flowing through each shunt 12 is 1/2In, and then the sum of the electric repulsive forces of the two shunts 12 to the movable contact 2 can be calculated according to the above electromotive force formula to be equal to 1/2 of the electric repulsive force of the main body 10 to the movable contact 2 when the shunt 12 is not provided. Therefore, the shunt part 12 is additionally arranged, so that the electric repulsion of the body part 10 to the moving contact 2 is properly reduced, the electric force applied to the moving contact 2 is reduced, the phenomenon that when a short circuit fault occurs in a conductive loop, the instantaneous increase of current causes the overlarge electric force applied to the moving contact 2, and the moving contact 2 is immediately separated from the contact part 13 is avoided, the short-time tolerance of a contact system is improved, and the selective protection device is very suitable for the environment of selective protection.
Specifically, at least two shunt parts 12 are connected in parallel and connected in series with the main body part 11. That is, the two connecting portions 111 of the main body portion 11 respectively constitute a current inflow end and a current outflow end of the main circuit in the conductive circuit.
In order to verify the endurance of the fixed contact structure in this embodiment, the inventor performed the following verification that the DC molded case circuit breaker of this embodiment has a voltage of DC1500V and a current of 400A, and calculates the multiple relationship among the electromotive attraction forces generated by the one shunt part 12, the two shunt parts 12, and the three shunt parts 12 to the movable contact 2.
When only one shunt part is provided, the current flowing through the shunt part is 400A, and the generated electric attraction force is as follows:
FL2＝(μ0/4π)*k*i2＝(μ0/4π)*k*4002；
when two shunt parts are arranged in parallel, the current of each shunt part is 200A, and the electric attraction force F of one shunt partL2’＝(μ0/4π)*k*i2＝(μ0/4π)*k*2002；
Total electric suction force F of two shunting partsL2＝2*FL2’＝2*(μ0/4π)*k*2002；
When three shunt parts are arranged in parallel, the current flowing through each shunt part is about 133A, and the electric attraction force F of one shunt partL2”＝(μ0/4π)*k*i2＝(μ0/4π)*k*1332；
Total electric suction force F of three flow-dividing partsL2＝3*FL2”＝3*(μ0/4π)*k*1332；
The multiple relationship of the electric repulsive force in three cases is as follows:
(μ0/4π)*k*4002:2*(μ0/4π)*k*2002:3*(μ0/4π)*k*1332
＝160000:80000:53067.
as described above, the larger the number of the flow dividing portions, the smaller the electric suction force and the larger the short-term durability.
Preferably, the main body 11 includes at least two sets, and the at least two sets of main body 11 are connected in parallel. At least two groups of main body parts 11 are arranged at intervals to form an avoidance space for the on-off movement of the movable contact 2 and the contact part 13. Specifically, as shown in fig. 1, the two sets of body portions 11 are arranged at intervals in the front-rear direction, an escape space is formed in the middle, the contact portion 14 is provided at the left end of the two sets of body portions 11 and extends toward the left side, and the contact portion 13 is provided at the right end of the two sets of body portions 11 and also extends toward the left side. That is, the two sets of body portions 11 are connected in parallel and then connected in series with the contact portion 13 and the terminal portion 14, and the contact portion 13 is provided between the two sets of body portions 11 and swings up and down in the escape space to be brought into contact with or separated from the contact portion 13.
Optionally, any group of the main body 11 is provided with at least three shunt parts 12, the at least three shunt parts 12 are arranged in parallel and at intervals along the vertical direction, and two ends of each shunt part 12 are respectively connected with the two connecting parts 111 of the main body 11. Optionally, at least one shunt part 12 of the at least three shunt parts 12 has a resistance different from the resistance of the other shunt parts 12. Preferably, the resistances of all the shunt parts 12 are the same. The structural design is simpler.
Preferably, the body portion 11, the shunt portion 12, the contact portion 13, and the tab portion 14 are integrally molded. Specifically, the contact portion 14, the main body portion 11 including the two connection portions 111, the two shunt portions 12, and the contact portion 13 are each formed by punching and bending a single conductor. The integrated forming structure is simple, the manufacturing cost is low, and the manufacturing is convenient.
Preferably, a bent portion 131 bent toward the shunt portion 12 is formed at one end of the contact portion 13 away from the connection portion 111, specifically, at the end contacting the connection portion 111 on the right side as shown in fig. 1, that is, at the right end of the contact portion 13 as shown in fig. 1. The provision of the bent portion 131 may assist the rapid upward movement of the arc, reducing erosion of the contacts. Specifically, the upper surface of the bent portion 131 is lower than the upper surface of the stationary contact. Alternatively, all the flow dividing portions 12 are arranged in parallel and perpendicular to the connecting portion 111. Alternatively, the joint portion 14 is inverted L-shaped.
Example 2
The contact system of the present embodiment, as shown in fig. 1 to 2, includes a movable contact component and a fixed contact component that can be contacted and conducted, where the fixed contact component includes at least one fixed contact structure 1 of embodiment 1. The movable contact assembly may be linked to an operating mechanism (not shown). The specific structure of the moving contact assembly is not described or limited in detail herein, and is conventional single contact moving contact structure. For the movable contact assembly, the movable contact assembly can only comprise one movable contact and also comprise a plurality of movable contacts, and the plurality of movable contacts are connected through a linkage mechanism. The number of the fixed contact assemblies can be one, or a plurality of the fixed contact assemblies, and corresponds to the number of the movable contacts. Because the static contact structure is adopted, the static contact structure at least has the advantages of the static contact structure of the embodiment 1, and details are not repeated here.
Example 3
The circuit breaker of the present embodiment, as shown in fig. 1 to 2, includes the contact system of embodiment 2. Because the static contact structure is adopted, the static contact structure at least has the advantages of the static contact structure of the embodiment 1, and details are not repeated here.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. A static contact structure, comprising:
the main body part (10) comprises at least one group of main body parts (11) and at least two shunt parts (12), each group of main body parts (11) comprises two connecting parts (111) which are opposite and arranged at intervals, and the shunt parts (12) are arranged between the two connecting parts (111) side by side and are respectively connected with the two connecting parts (111);
the contact part (13) is connected with the connecting part (111) of the main body part (11) close to the moving contact (2) and can be in contact conduction with the moving contact (2) to form a conductive loop;
when current passes through the conductive loop, the direction of the current flowing through all the shunt parts (12) and the movable contact (2) is the same and is opposite to the direction of the current flowing through the contact part (13);
the moving contact (2) is subjected to electrodynamic force FLEqual to the electric repulsion F of the contact part (13) to the moving contact (2)L1The electric attraction force F of all the shunt parts (12) to the moving contact (2)L2iThe sum of the total weight of the components,
FL＝FL1+FL21+FL22+…+FL2i(ii) a Wherein i is an integer of 2 or more.
2. The static contact structure according to claim 1, wherein at least two shunt portions (12) are connected in parallel and in series with the main body portion (11).
3. The static contact structure according to claim 1 or 2, wherein the main body portions (11) comprise at least two groups, and the at least two groups of main body portions (11) are connected in parallel;
at least two groups of main body parts (11) are arranged at intervals to form an avoidance space for the movable contact (2) and the contact part (13) to be connected and disconnected.
4. The static contact arrangement according to any of the claims 1-3, characterized in that any set of said body portions (11) is provided with at least three of said shunt portions (12), at least one of said shunt portions (12) of said at least three shunt portions (12) having a resistance different from the resistance of the other of said shunt portions (12).
5. The static contact arrangement according to any of the claims 1-3, characterised in that the resistance of all shunt parts (12) is the same.
6. The static contact structure according to any one of claims 1 to 5, wherein one end of the contact portion (13) away from the connecting portion (111) is formed with a bending portion (131) bending toward the shunt portion (12); and/or
All the shunting parts (12) are arranged in parallel and are perpendicular to the connecting part (111).
7. The static contact structure of any of claims 1-6, further comprising;
the joint part (14) is arranged on the connecting part (111) at one end of the main body part (11) far away from the movable contact part (2), the extending direction of the joint part is consistent with that of the contact part (13), and the joint part and the contact part both extend towards the direction far away from the movable contact part (2);
the direction of the current flowing through the joint part (14) is the same as that of the current flowing through the shunt part (12) and the movable contact (2), and is opposite to that of the current flowing through the contact part (13).
8. The static contact arrangement according to claim 7, characterized in that the body portion (11), the shunt portion (12), the contact portion (13) and the junction portion (14) are integrally formed.
9. A contact system comprising a fixed contact and a movable contact which can be contacted and conducted, wherein the fixed contact component comprises the fixed contact structure of any one of claims 1 to 8.
10. A circuit breaker comprising the contact system of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110112733.4A CN112802722A (en) | 2021-01-27 | 2021-01-27 | Static contact structure, contact system and circuit breaker |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110112733.4A CN112802722A (en) | 2021-01-27 | 2021-01-27 | Static contact structure, contact system and circuit breaker |
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| Publication Number | Publication Date |
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| CN112802722A true CN112802722A (en) | 2021-05-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110112733.4A Pending CN112802722A (en) | 2021-01-27 | 2021-01-27 | Static contact structure, contact system and circuit breaker |
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| CN (1) | CN112802722A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113517163A (en) * | 2021-07-23 | 2021-10-19 | 西安理工大学 | Strong air-blowing current-limiting high-voltage circuit breaker arc extinguish chamber |
-
2021
- 2021-01-27 CN CN202110112733.4A patent/CN112802722A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113517163A (en) * | 2021-07-23 | 2021-10-19 | 西安理工大学 | Strong air-blowing current-limiting high-voltage circuit breaker arc extinguish chamber |
| CN113517163B (en) * | 2021-07-23 | 2023-02-28 | 西安理工大学 | Strong air-blowing current-limiting type arc extinguish chamber of high-voltage circuit breaker |
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