CN116403839A - Main circuit conductor and shutter - Google Patents
Main circuit conductor and shutter Download PDFInfo
- Publication number
- CN116403839A CN116403839A CN202211458235.6A CN202211458235A CN116403839A CN 116403839 A CN116403839 A CN 116403839A CN 202211458235 A CN202211458235 A CN 202211458235A CN 116403839 A CN116403839 A CN 116403839A
- Authority
- CN
- China
- Prior art keywords
- contact
- current
- conductor
- main circuit
- caulking
- 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.)
- Pending
Links
- 239000004020 conductor Substances 0.000 title claims abstract description 98
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- 229910002804 graphite Inorganic materials 0.000 claims description 5
- 239000010439 graphite Substances 0.000 claims description 5
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 claims description 5
- 230000007774 longterm Effects 0.000 abstract description 7
- 239000010953 base metal Substances 0.000 description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 6
- 229910052802 copper Inorganic materials 0.000 description 6
- 239000010949 copper Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 229910001316 Ag alloy Inorganic materials 0.000 description 4
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 229910052709 silver Inorganic materials 0.000 description 4
- 239000004332 silver Substances 0.000 description 4
- 229910006404 SnO 2 Inorganic materials 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000005304 joining Methods 0.000 description 2
- 238000005476 soldering Methods 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000005219 brazing Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/58—Electric connections to or between contacts; Terminals
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/06—Contacts characterised by the shape or structure of the contact-making surface, e.g. grooved
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Contacts (AREA)
- Powder Metallurgy (AREA)
- Manufacture Of Switches (AREA)
- Breakers (AREA)
Abstract
A main circuit conductor capable of ensuring long-term reliability is obtained. The main circuit conductor has: a current-carrying conductor (5) provided with a through hole (5 a); and a rivet contact (20) that is inserted into the through hole (5 a) of the current-carrying conductor (5) and is crimped. When the thickness of the current-carrying conductor (5) is t and the amount of caulking after caulking the rivet contact (20) is d, t× (d 1.4 ) > 2.3 and d+t < 4.7mm.
Description
Technical Field
The present invention relates to a main circuit conductor and a shutter having a structure in which contacts are crimped to conductors for current application.
Background
A main circuit conductor constituting a fixed-side contact conductor or a movable-side contact conductor of a shutter such as an electromagnetic shutter or a circuit breaker includes a conductor for current conduction and a contact fixed to the conductor for current conduction. Silver alloys are mostly used for these contacts. For example, sintered contacts of the Ag-WC-Gr type, ag-In 2 O 3 －SnO 2 The dissolved contacts and the like are used as contacts of silver alloy, and they are used in a distinction manner according to rated current or breaking capacity. In addition, there are methods of joining a rivet-shaped contact to a conductor for conduction, joining a conductor for conduction to a contact by solder, and the like, but the cost of the caulking joint is low, and therefore, the method is advantageous in terms of cost.
Patent document 1: japanese patent laid-open No. 10-223076
The rivet joint is advantageous in terms of cost, but has a problem that cracks are generated or deformation becomes large depending on the kind of the contact point. For example, if a rivet-shaped sintered contact is crimped to a conductor for current application, cracks are generated in the sintered contact or deformation becomes large. As described above, if an impact of several thousands times such as a no-load endurance test is applied to the contact, a problem arises in that the contact is notched or the contact is easily separated, which lacks long-term reliability. Further, if the deformation is large, there is a problem that the regulations that the thickness of the silver contact is 0.5mm or more, which are prescribed by the electrical safety law, cannot be complied with.
Disclosure of Invention
The present invention has been made in view of the above circumstances, and an object thereof is to obtain a main circuit conductor capable of securing long-term reliability.
In order to solve the above problems and achieve the object, a main circuit conductor of the present invention includes: a current-carrying conductor provided with a hole; and a rivet-shaped contact inserted into the hole of the current-carrying conductor and crimped. When the thickness of the current-carrying conductor is t and the amount of caulking after caulking the contact is d, t× (d 1.4 ) > 2.3 and d
+t＜4.7mm。
ADVANTAGEOUS EFFECTS OF INVENTION
The main circuit conductor according to the present invention has an effect of ensuring long-term reliability.
Drawings
Fig. 1 is a cross-sectional view showing a trip state of a circuit breaker according to embodiment 1.
Fig. 2 is a cross-sectional view showing an on state of the circuit breaker according to embodiment 1.
Fig. 3 is a cross-sectional view showing the structure of a rivet-shaped contact according to embodiment 1.
Fig. 4 is a front view showing a state before the rivet contact is swaged by the conductor for energization according to embodiment 1.
Fig. 5 is a front view showing a state in which the rivet contact is swaged by the conductor for energization according to embodiment 1.
Fig. 6 is a front view showing a state in which the current-carrying conductor according to embodiment 1 cannot properly rivet the rivet contact.
Fig. 7 is a graph showing the results of a test for caulking a rivet contact to a current-carrying conductor in embodiment 1, in which the thickness of the current-carrying conductor is shown on the horizontal axis and the caulking amount is shown on the vertical axis, and shows the presence or absence of cracks generated in the contact.
Fig. 8 is a cross-sectional view showing a trip state of the double-cut circuit breaker according to embodiment 2.
Fig. 9 is a cross-sectional view showing the structure of an electromagnetic shutter according to embodiment 3.
Detailed Description
The main circuit conductor and the shutter according to the embodiment will be described in detail below with reference to the drawings.
Fig. 1 is a cross-sectional view showing a trip state of a circuit breaker according to embodiment 1. Fig. 2 is a cross-sectional view showing an on state of the circuit breaker according to embodiment 1.
In fig. 1 and 2, the circuit breaker as a shutter includes a handle 10, an opening and closing mechanism 30, a fixed-side current-carrying conductor 6, a fixed-side contact 7 provided on the fixed-side current-carrying conductor 6, a movable-side current-carrying conductor 8, and a movable-side contact 9 provided on the movable-side current-carrying conductor 8. The details of the structure of the opening/closing mechanism unit 30 are not essential to the present invention, and therefore, the description thereof will be omitted.
As shown in fig. 1 and 2, when the handle 10 is turned on, the opening and closing mechanism 30 is operated, the movable-side current-carrying conductor 8 is rotationally driven, the movable-side contact 9 contacts the fixed-side contact 7, and the movable-side current-carrying conductor 8 and the fixed-side current-carrying conductor 6 are brought into a conductive state. At the moment when the movable side contact 9 contacts the fixed side contact 7, an impact generated by closing the movable side contact 9 and the fixed side contact 7 is applied to the movable side contact 9 and the fixed side contact 7. If a crack is generated in the movable contact 9 or the fixed contact 7 due to the impact, the crack may be deepened by several thousands of impacts such as a no-load endurance test, and a defect may occur in the movable contact 9 or the fixed contact 7, or the movable contact 9 or the fixed contact 7 may come off, or the like.
Fig. 3 is a cross-sectional view showing the structure of a rivet-shaped contact 20 according to embodiment 1. The rivet-shaped contact 20 is a generic term for the movable contact 9 or the fixed contact 7. Hereinafter, the rivet-shaped contact 20 is referred to as a rivet contact 20. As shown in fig. 3, the rivet contact 20 has: a base metal part 1 having a rivet shape; and a contact 2 bonded to the base metal portion 1. The base metal portion 1 has a body portion 1a having no screw thread and a head portion 1b having a larger diameter than the body portion 1 a. The boundary surface between the base metal portion 1 and the contact 2 shows a joint surface 3 where the base metal portion 1 and the contact 2 are joined by brazing, cold compression bonding, hot compression bonding, or the like.
The material of the base metal portion 1 is, for example, copper, preferably pure copper such as oxygen-free copper or annealed copper. The material of the contact 2 is an alloy of the silver type, for example, ag-WC-Gr, ag-WC, ag-In 2 O 3 －SnO 2 、Ag－SnO 2 Class. As described above, the materials of the base metal portion 1 and the contact 2 are various, and the bonding method of the base metal portion 1 and the contact 2 is also various.
Fig. 4 is a front view showing a state before the rivet contact 20 is swaged by the current-carrying conductor 5 according to embodiment 1. Fig. 5 is a front view showing a state in which the rivet contact 20 is swaged by the current-carrying conductor 5 according to embodiment 1. The current-carrying conductor 5 is a generic term for the current-carrying conductor 6 on the fixed side and the current-carrying conductor 8 on the movable side. The main circuit conductor is constituted by the current-carrying conductor 5 and the rivet contact 20. The material of the current-carrying conductor 5 is, for example, copper, aluminum, iron, or the like.
As shown in fig. 4, after the body portion 1a of the base metal portion 1 of the rivet contact 20 is inserted into the through hole 5a provided in the current-carrying conductor 5, a force is applied to the distal end surface 1c of the body portion 1a of the base metal portion 1 of the rivet contact 20 protruding from the current-carrying conductor 5 by a tool such as a punch 11, thereby caulking.
As a result, as shown in fig. 5, the distal end portion 1d of the body portion 1a of the base metal portion 1 protruding from the current-carrying conductor 5 is deformed and crimped. The thickness of the current-carrying conductor 5 is t, and the distance from the distal end surface 1e of the rivet contact 20 after caulking to the current-carrying conductor 5 is d. Hereinafter, d is referred to as the caulking amount. When the distal end surface 1e of the rivet contact 20 after caulking is not planar, the caulking amount d is determined based on the average position of the distal ends constituting the distal end surface 1 e.
Fig. 6 is a front view showing a state in which the current-carrying conductor 5 according to embodiment 1 cannot properly rivet the rivet contact 20. As shown in fig. 6, if the caulking amount d is too long, only the vicinity of the distal end surface 1c of the body portion 1a of the base metal portion 1 expands, so that the portion of the through hole 5a of the current-carrying conductor 5 does not expand, and the base metal portion 1 moves relative to the current-carrying conductor 5, and the rivet contact 20 cannot be caulked with an appropriate caulking strength.
Fig. 7 is a graph showing the results of a test for caulking the rivet contact 20 to the current-carrying conductor 5 in embodiment 1, in which the thickness t of the current-carrying conductor 5 is shown as the horizontal axis, and the caulking amount d is shown as the vertical axis, and is a graph showing the presence or absence of cracks generated in the contact 2. The unit of the caulking amount d is mm, and the unit of the thickness t of the current-carrying conductor 5 is mm. The current-carrying conductor 5 was copper, and the contact 2 was Ag (85 wt%) -WC (12 wt%) -Gr (3 wt%). wt% is weight percent. At the time of caulking, the contact 2 slightly swells, and the diameter of the contact 2 becomes large, but the outer periphery of the contact 2 is not restricted and caulking is performed in this test. The mark (c) indicates a state where there is no contact crack that can be visually confirmed, and the x mark indicates that there is a contact crack that can be visually confirmed. The threshold a1 shown by the white triangle is a threshold for identifying the presence or absence of a contact crack. If the caulking amount d is greater than the threshold value a1, contact cracks may be generated, and if the caulking amount d is less than the threshold value a1, contact cracks may not be generated. The threshold a2 shown by the darkened triangle is a threshold for determining whether the caulking force is gentle, and if the caulking amount d is larger than the threshold a2, the caulking force is gentle, and an appropriate caulking force is not obtained, and if the caulking amount d is smaller than the threshold a2, a necessary caulking force is obtained.
According to the test results of FIG. 7, the test results were shown at t X (d 1.4 ) If the value of (2) is greater than 2.3, that is, if the following formula (1) is satisfied, it is visually confirmed that no crack is generated in the contact 2.
t×(d 1.4 )＞2.3· · · · · (1)
As a result, it is shown that when the thickness t of the current-carrying conductor 5 is small, the force at the time of caulking is easily transmitted to the contact 2, and therefore, it is necessary to make the caulking shallow (i.e., increase the caulking amount d), but when the thickness t of the current-carrying conductor 5 is large, the force at the time of caulking is less easily transmitted to the contact 2, and therefore, it is possible to make the caulking deep (i.e., decrease the caulking amount d).
Further, as shown in the threshold value a2, if d+t is equal to or greater than 4.7, the caulking force is retarded and the contact stability is impaired as shown in fig. 6, so that it is not possible to use the conductor as a main circuit conductor. Therefore, in order to obtain an appropriate caulking strength, the total of the thickness t of the current-carrying conductor 5 and the caulking amount d needs to be smaller than 4.7mm as shown in the following formula (2).
d+t＜4.7· · · · · (2)
When the main circuit conductor satisfying the expression (1) is mounted on a shutter such as a circuit breaker or an electromagnetic shutter, the main circuit conductor can withstand several thousands of impacts such as a no-load endurance test, and long-term reliability can be ensured.
In the case of the contact having the vickers hardness of 160HV or less, if the formula (1) is not satisfied, the contact 2 is easily deformed when the rivet contact 20 is caulking, and the contact 2 is shaped so as not to satisfy the contact regulations of 0.5mm or more in the case of the silver alloy contact prescribed by the electrical safety law, for example.
If tungsten carbide is contained in the sintered contact, cracking is more likely to occur because of the lack of resistance to the impact force of caulking, as compared with the silver-based alloy contact, and the effect of formula (1) is more remarkable. In particular, in the case where the content of tungsten carbide is 40wt% or less, if the formula (1) is not satisfied, the contact 2 is easily deformed at the time of caulking the rivet contact 20, and the contact regulation of 0.5mm or more is not satisfied in the case of a silver alloy contact prescribed by the electrical appliance safety law, for example, due to the shape of the contact 2. In addition, although the sintered contact is normally joined to the conductive conductor by soldering, in embodiment 1, the rivet shape, which is cheaper than soldering, can suppress the temperature rise at the time of the conduction and realize the characteristics of the sintered contact excellent in the welding performance of the contact.
If graphite is contained in the sintered contact, cracking is more likely to occur, and the effect of formula (1) is more remarkable, as compared with the silver-based alloy contact described above, which is not resistant to the impact force of caulking. In particular, in the case where the content of graphite is 2% or more, the effect of the formula (1) appears more remarkably, and can withstand several thousands of impacts as in the no-load endurance test, and long-term reliability can be ensured. Further, by the low-cost rivet shape, the temperature rise at the time of energization can be suppressed, and the characteristics of the sintered contact excellent in the welding performance of the contact can be realized.
In addition, tungsten carbide and graphite may not be contained in the contact 2, and in this case, the characteristics of a sintered contact excellent in the welding performance of the contact can be realized by suppressing the temperature rise at the time of energization by a low-cost rivet shape.
As described above, according to embodiment 1, the thickness of the current-carrying conductor 5 is set toWhen the amount of caulking after caulking the rivet contact 20 is d, t× (d 1.4 ) The contact is more than 2.3 and d+t is less than 4.7mm, so that cracks are not generated on the contact, the contact is not easy to fall off, and the long-term reliability of the main circuit conductor can be ensured.
An example of the circuit breaker in which embodiment 1 is a single-cut circuit breaker is described, but embodiment 2 is a circuit breaker in which the main circuit conductor having the rivet contact 20 and the current-carrying conductor 5 described in embodiment 1 is applied to a double-cut circuit breaker. Fig. 8 is a cross-sectional view showing a trip state of the double-cut circuit breaker according to embodiment 2.
As shown in fig. 8, the circuit breaker includes, as fixed contacts, a1 st fixed contact 40 as a conductor for current application, a1 st fixed contact 41 provided on the 1 st fixed contact 40, a2 nd fixed contact 42 as a conductor for current application, and a2 nd fixed contact 43 provided on the 2 nd fixed contact 42. The circuit breaker shown in fig. 8 includes, as movable contacts, a1 st movable contact 50 as a current-carrying conductor, a1 st movable contact 51 provided on the 1 st movable contact 50, a2 nd movable contact 52 as a current-carrying conductor, and a2 nd movable contact 53 provided on the 2 nd movable contact 52. The 1 st movable contact 50 and the 2 nd movable contact 52 are integral members supported by the rotary shaft 54 of the rotor 55, and extend in opposite directions from each other. From the state shown in fig. 8, if the rotor 55 rotates clockwise, the 1 st movable contact 50 and the 2 nd movable contact 52 rotate clockwise, the 1 st movable contact 51 comes into contact with the 1 st fixed contact 41, the 2 nd movable contact 53 comes into contact with the 2 nd fixed contact 43, and the circuit breaker is brought into an on state.
The main circuit conductor having the rivet contact 20 and the current-carrying conductor 5 described in detail in embodiment 1 can be used as a fixed contact and a movable contact of the double-cut circuit breaker shown in fig. 8.
The electromagnetic shutter as a shutter has, as fixed contacts, a1 st fixed contact 60 as a conductor for energization, a1 st fixed contact 61 provided on the 1 st fixed contact 60, a2 nd fixed contact 62 as a conductor for energization, and a2 nd fixed contact 63 provided on the 2 nd fixed contact 62. The electromagnetic switch has, as movable contacts, a1 st movable contact 70 as a current-carrying conductor, a1 st movable contact 71 provided on the 1 st movable contact 70, a2 nd movable contact 72 as a current-carrying conductor, and a2 nd movable contact 73 provided on the 2 nd movable contact 72. The 1 st movable contact 70 and the 2 nd movable contact 72 are integral members supported by a plunger 74 of an electromagnetic actuator 75, and extend in opposite directions from each other. From the state shown in fig. 9, the electromagnetic actuator 75 includes a fixed iron core 76 and a movable iron core 77, and if a current flows in the coil 78, the fixed iron core 76 attracts the movable iron core 77. A plunger 74 is attached to the movable core 77. When the electromagnetic actuator 75 is operated, the fixed iron core 76 attracts the movable iron core 77, and thereby the 1 st movable contact 71 comes into contact with the 1 st fixed contact 61, the 2 nd movable contact 73 comes into contact with the 2 nd fixed contact 63, and the electromagnetic switch is brought into a conductive state.
The main circuit conductor including the rivet contact 20 and the current-carrying conductor 5 described in detail in embodiment 1 can be used as a fixed contact and a movable contact of the electromagnetic switch shown in fig. 9.
The configuration shown in the above embodiment represents a part of the content of the present invention, and may be combined with other known techniques, and may be appropriately combined, or a part of the configuration may be omitted or changed without departing from the scope of the present invention.
Description of the reference numerals
A base metal part, a 1a body part, a 1b head part, 1c and 1e front end surfaces, 1d front end parts, 2 contacts, 3 joint surfaces, 5, 6 and 8 conductors for current application, 5a through holes, 7 fixed side contacts, 9 movable side contacts, 10 handles, 11 punches, 20 rivet-shaped contacts (rivet contacts), 30 opening and closing mechanism parts, 40, 60 st fixed contacts, 41, 61 st fixed contacts, 42, 62 nd fixed contacts, 43, 63 nd fixed contacts, 50, 70 st movable contacts, 51, 71 st movable contacts, 52, 72 nd movable contacts, 53, 73 nd movable contacts, 54 rotary shafts, 55 rotors, 74 plungers, 75 electromagnetic actuators, 76 fixed cores, 77 movable cores, 78 coils, d rivet amounts, t thicknesses of conductors for current application.
Claims (7)
1. A main circuit conductor, comprising:
a current-carrying conductor provided with a hole; and
a rivet-shaped contact inserted into the hole of the current-carrying conductor and riveted,
when the thickness of the current-carrying conductor is t and the caulking amount after caulking the contact is d,
satisfy t× (d) 1.4 ) > 2.3 and d+t < 4.7mm.
2. The main circuit conductor of claim 1, wherein the main circuit conductor is configured to connect to the main circuit conductor,
the contacts have a vickers hardness of less than or equal to 160HV.
3. Main circuit conductor according to claim 1 or 2, characterized in that,
the contact is a sintered contact and contains tungsten carbide.
4. A main circuit conductor according to claim 3, wherein,
the tungsten carbide content of the contact is less than or equal to 40 wt%.
5. Main circuit conductor according to any of claims 1 to 4, characterized in that,
the contact is a sintered contact and contains graphite.
6. The main circuit conductor of claim 5, wherein the main circuit conductor is configured to electrically connect to the main circuit conductor,
the contact contains the graphite at greater than or equal to 2 wt%.
7. A shutter is characterized in that,
use of the main circuit conductor according to any one of claims 1 to 6.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2022000621A JP2023100148A (en) | 2022-01-05 | 2022-01-05 | Main circuit conductor and switchgear |
| JP2022-000621 | 2022-01-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116403839A true CN116403839A (en) | 2023-07-07 |
Family
ID=87014751
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211458235.6A Pending CN116403839A (en) | 2022-01-05 | 2022-11-21 | Main circuit conductor and shutter |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2023100148A (en) |
| CN (1) | CN116403839A (en) |
-
2022
- 2022-01-05 JP JP2022000621A patent/JP2023100148A/en active Pending
- 2022-11-21 CN CN202211458235.6A patent/CN116403839A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JP2023100148A (en) | 2023-07-18 |
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