CN110660595A - High-voltage switch through-flow structure and moving contact thereof - Google Patents
High-voltage switch through-flow structure and moving contact thereof Download PDFInfo
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- CN110660595A CN110660595A CN201910844575.4A CN201910844575A CN110660595A CN 110660595 A CN110660595 A CN 110660595A CN 201910844575 A CN201910844575 A CN 201910844575A CN 110660595 A CN110660595 A CN 110660595A
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- contact
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- 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
- H01H1/502—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position the action of the contact pressure spring becoming active only after engagement of the contacts
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- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
The invention relates to a through-flow structure of a high-voltage switch and a moving contact thereof. The high-voltage switch through-flow structure comprises a fixed contact and a moving contact, wherein the fixed contact comprises a fixed contact finger and a fixed arc contact which are arranged in an annular mode, the moving contact comprises a moving contact rod and a moving arc contact arranged at the front end of the contact rod, the fixed arc contact is a columnar contact coaxially arranged in the middle of the fixed contact finger, an opening is formed in the front end of the moving arc contact, a moving contact finger matched with the outer peripheral surface of the fixed arc contact is arranged in the opening, the front end of the moving contact finger is located on the inner side of an opening of the opening, and the fixed arc contact is higher than the fixed contact finger. In the switching-on process, the movable contact finger contacts with the static arc contact first, the movable arc contact contacts with the static contact finger afterwards, the movable contact finger bears the arc gap current in the pre-breakdown process, and the static contact finger bears the rated current after switching-on, so that the vibration of the movable contact under the action of the electrodynamic force can be limited, and the peak current can be effectively conducted.
Description
Technical Field
The invention relates to a through-flow structure of a high-voltage switch and a moving contact thereof.
Background
The current-carrying conductor in the magnetic field is acted by force inevitably, the force attempts to change the shape of a loop, and in the switching-on process of the moving contact of the high-voltage switch, current flows through the moving contact from the arc gap pre-breakdown moment, the current generates the magnetic field, and the moving contact is used as the current-carrying conductor and acted by force in the magnetic field.
The ability to turn off the short circuit current is an important indicator of high voltage switches. The short-circuit current has two assessment indexes, one is peak current, and the other is short-circuit current. The peak current forms large electrodynamic force which can cause the whole switch contact part to generate violent oscillation; the short circuit current produces a large thermal effect. If the through-flow structure of the high-voltage switch is not enough to overcome the electrodynamic force, the contact point is stressed and vibrated, so that the contact point is unreliable, the heating value is increased violently, ablation is generated, and the structure is damaged and closed to fail. Many existing switches cannot tolerate electric power or heat effect when the movable contact is closed.
The chinese patent application with publication number CN105448549A and publication date 2016.03.30 discloses a contact assembly and a grounding switch and a metal-enclosed switch device using the same, as shown in fig. 1, the contact assembly includes a static contact 1 and a moving contact 2, the static contact 1 includes a shielding cover and a static contact finger 7 assembled inside the shielding cover, the static contact finger 7 is arranged in a ring shape, an insertion end of the static contact finger 7 is provided with a caulking groove, a block-shaped static arc contact 6 is arranged in the caulking groove, and the moving contact 2 includes a moving contact rod 3 and a moving arc contact 4 which is provided at the front end of the moving contact rod and is made of copper-tungsten alloy and is in a truncated cone shape. The contact assembly is used for switching on and off, electric arcs between the contact and the contact fingers act on the arc contact with ablation resistance, after the switch is closed in place, the contact rod and the contact fingers are made of pure copper, and the contact rod and the contact fingers are guaranteed to have good and stable conductive performance by utilizing the characteristics that the contact resistance of the pure copper is smaller than that of a copper-tungsten alloy material and the conductive performance is good, so that the stability of the switch in use is improved. However, at the moment when the high-voltage switch is switched on, the contact part generates a large electromotive force, and the whole switch contact part generates a violent vibration, so that the static contact 1 and the moving contact 2 cannot be well matched.
Disclosure of Invention
The invention aims to provide a through-flow structure of a high-voltage switch, which solves the problems that the contact part of the existing switch contact component generates large electrodynamic force at the moment of switching on the high-voltage switch, the contact part of the whole switch can generate violent vibration, and a moving contact and a static contact cannot be well matched; the invention also aims to provide the moving contact of the through-current structure of the high-voltage switch.
In order to achieve the purpose, the technical scheme of the through-current structure of the high-voltage switch is as follows:
the technical scheme 1: the high-voltage switch through-flow structure comprises a fixed contact and a moving contact, wherein the fixed contact comprises a fixed contact finger and a fixed arc contact which are arranged in an annular mode, the moving contact comprises a moving contact rod and a moving arc contact arranged at the front end of the contact rod, the fixed arc contact is a columnar contact coaxially arranged in the middle of the fixed contact finger, an opening is formed in the front end of the moving arc contact, a moving contact finger matched with the outer peripheral surface of the fixed arc contact is arranged in the opening, the front end of the moving contact finger is located on the inner side of an opening of the opening, and the fixed arc contact is higher than the fixed contact finger. The beneficial effects are as follows: in the switching-on process, the movable contact finger contacts with the static arc contact first, the movable arc contact contacts with the static contact finger afterwards, the movable contact finger bears the arc gap current in the pre-breakdown process, and the static contact finger bears the rated current after switching-on, so that the vibration of the movable contact under the action of the electrodynamic force can be limited, and the peak current can be effectively conducted.
The technical scheme 2 is as follows: according to the through-flow structure of the high-voltage switch in the technical scheme 1, the outer wall of the movable contact rod is provided with the ring platform, the movable arc contact is sleeved on the ring platform of the movable contact rod and forms an annular interval with the movable contact rod, the movable contact finger is of a cylindrical structure, and the rear end of the movable contact finger is clamped in the annular interval between the movable arc contact and the movable contact rod in an interference fit manner. The interference fit structure not only ensures the contact pressure of the contact surface, but also makes the space compact.
Technical scheme 3: according to the through-flow structure of the high-voltage switch in the technical scheme 1, the front end of the moving arc contact is provided with an inner folded edge for shielding the moving contact finger.
The technical scheme 4 is as follows: according to the through-flow structure of the high-voltage switch in the technical scheme 1, 2 or 3, the movable contact finger is a cylindrical structure formed by punching and rolling a plate, split structures uniformly distributed along the circumference are arranged on the movable contact finger, and the split structures axially extend along the movable contact finger.
According to the technical scheme 5, according to the through-flow structure of the high-voltage switch in the technical scheme 4, the following steps are carried out: at least one side edge of the valving structure close to the root thereof is provided with a process notch which is concave to the axis of the valving structure.
The technical scheme 7 is as follows: according to the through-flow structure of the high-voltage switch in the technical scheme 1, 2 or 3, the static contact comprises a static contact seat arranged at the lower end, a static shielding cover used for shielding a static contact finger is arranged on the static contact seat, and the height of the static arc contact is lower than that of the static shielding cover. When the static contact is matched and communicated with the moving contact, the static shielding cover shields the surrounding electric field.
The technical scheme of the moving contact of the high-voltage switch through-flow structure is as follows:
the technical scheme 1: the moving contact of the through-flow structure of the high-voltage switch comprises a moving contact rod and a moving arc contact arranged at the front end of the contact rod, wherein the front end of the moving arc contact is provided with an opening, a moving contact finger matched with the peripheral surface of the static arc contact is arranged in the opening, and the front end of the moving contact finger is positioned on the inner side of an orifice of the opening.
The technical scheme 2 is as follows: according to the moving contact of the through-flow structure of the high-voltage switch in the technical scheme 1, the outer wall of the moving contact rod is provided with the ring platform, the moving arc contact is sleeved on the ring platform of the moving contact rod and forms an annular interval with the moving contact rod, the moving contact finger is of a cylindrical structure, and the rear end of the moving contact finger is clamped in the annular interval between the moving arc contact and the moving contact rod in an interference fit manner.
Technical scheme 3: according to the moving contact of the through-flow structure of the high-voltage switch in the technical scheme 1, the front end of the moving arc contact is provided with an inner folded edge for shielding the moving contact finger.
The technical scheme 4 is as follows: according to the moving contact of the through-current structure of the high-voltage switch in the technical scheme 1, 2 or 3, the moving contact finger is a cylindrical structure which is formed by punching and rolling a plate, split structures which are uniformly distributed along the circumference are arranged on the moving contact finger, and the split structures axially extend along the moving contact finger.
The technical scheme 5 is as follows: according to the moving contact of the through-current structure of the high-voltage switch in the technical scheme 4, at least one side edge of the split structure close to the root of the split structure is provided with a process notch which is concave to the axis of the split structure.
The technical scheme 6 is as follows: according to the moving contact of the through-flow structure of the high-voltage switch in the technical scheme 4, the split structure is provided with an arc-shaped protrusion for contacting with the static arc contact.
Drawings
FIG. 1 is a schematic diagram of a prior art contact assembly;
fig. 2 is a schematic structural diagram of embodiment 1 of the high-voltage switch current structure of the invention;
fig. 3 is a schematic structural diagram of a movable contact of the current structure of the high-voltage switch shown in fig. 2;
FIG. 4 is an enlarged view of a portion of FIG. 3 at A;
fig. 5 is a schematic structural diagram of a static contact of the through-current structure of the high-voltage switch shown in fig. 2;
fig. 6 is a schematic structural diagram of the high-voltage switch shown in fig. 2 after a moving contact of the current structure is unfolded;
fig. 7 is a schematic structural diagram of a moving contact finger of the moving contact of the high-voltage switch current structure shown in fig. 2.
Description of reference numerals: 1-static contact, 2-moving contact, 3-moving contact rod, 4-moving arc contact, 5-moving contact finger, 6-static arc contact, 7-static contact finger, 8-static shielding cover, 9-static contact seat, 10-moving contact finger flap, 11-fabrication hole, 12-arc bulge, 13-inner folded edge and 14-opening hole.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
In embodiment 1 of the high-voltage switch current structure of the invention, as shown in fig. 2 to 7, the high-voltage switch current structure includes a static contact 1 and a moving contact 2, the static contact 1 is composed of a static arc contact 6, a static contact finger 7, a static shield cover 8 and a static contact base 9, the static contact finger 7 and the static arc contact 6 are assembled on the static contact base 9, the static arc contact 6 is a columnar contact, the static contact finger 7 is arranged around the static arc contact 6, the static arc contact 6 is higher than the static contact finger 7, the static contact finger 7 is shielded by the static shield cover 8 arranged on the static contact base 9, and the static arc contact 6 is lower than the static shield cover 8. Moving contact 2 comprises movable contact rod 3, movable contact finger 5 and movable arc contact 4, be equipped with the ring platform on the movable contact rod 3, movable arc contact 4 cover establish movable contact rod 3 the ring platform on and with form annular interval between the movable contact rod 3, movable contact finger 5's thickness is greater than movable contact rod 3 and the annular interval between the movable arc contact 4, movable contact finger 5 presss from both sides and establishes in the annular interval between movable contact rod 3 and the movable arc contact 4, movable contact rod 3 and movable arc contact 4 form interference fit, can enough guarantee the contact pressure of contact surface, can reduce the overall dimension of this structure again, make the space more compact. The movable contact finger 5 is a hollow cylinder formed by punching and rolling a plate, before rolling, a split structure with the same interval is evenly punched on the plate, namely a movable contact finger flap 10 overhanging on the movable contact finger 5, an arc-shaped bulge 12 contacted with a static arc contact 6 is arranged on the movable contact finger flap 10, process notches sinking towards the axis of the movable contact finger flap are arranged on two side edges of the movable contact finger flap 10 close to the root, the size of the movable contact finger flap 10 at the position is reduced, the movable contact finger flap can swing more easily when being matched with the static contact, when in processing, the root of two adjacent movable contact finger flaps 10 can be punched, namely, a process hole 11 is shown in the figure, the radial size of the process hole 11 is larger than the distance between the two movable contact finger flaps 10, therefore, process notches can be formed at two side edges of the movable contact finger flap 10 after punching is finished, and the punched position is positioned at the root of the movable contact finger flap 10, therefore, the connecting part between the two movable contact finger flaps can be sheared when punching is carried out, and the constraint of the movable contact finger 5 on the swing deformation of the movable contact finger flap 10 is reduced. The front end of the moving arc contact 4 is provided with an opening 14, the front end of the moving contact finger 5 is positioned at the inner side of the opening 14, and the front end of the moving contact is provided with an inner folded edge 13 for shielding the moving contact finger. During assembly, the rear end of the movable contact finger 5 is in contact fit with a ring platform on the movable contact rod 3, and then the movable arc contact 4 is pressed on the movable contact rod 3 by pressure.
In the switching-on process, the movable contact finger 5 is matched with the fixed arc contact 6, the fixed contact finger 7 is matched with the movable arc contact 4, the fixed arc contact 6 and the fixed contact finger 7 are both arranged on the fixed contact seat 9, the height of the fixed arc contact 6 is larger than that of the fixed contact finger 7, the movable contact finger 5 is firstly contacted with the fixed arc contact 6, the movable arc contact 4 is contacted with the fixed contact finger 7 at the back, the movable contact finger 5 bears arc gap current in the pre-breakdown process, and the fixed contact finger 7 bears rated current after switching-on.
In embodiment 2 of the through-current structure of the high-voltage switch, the movable contact finger flap may also be provided with a plurality of protrusions along the axial direction, for example, two or three corrugated protrusions are provided along the axial direction of the movable contact finger, so that the movable contact finger and the stationary contact finger can be ensured to be well matched.
In embodiment 3 of the through-current structure of the high-voltage switch, the movable contact finger can be fixed in the movable arc contact in other manners.
The moving contact of the high-voltage switch through-current structure has the same structure as that of the moving contact in any embodiment of the high-voltage switch through-current structure, and the description is not repeated.
Claims (10)
1. High-voltage switch through-flow structure, including static contact and moving contact, the static contact includes that the static that is the annular and arranges touches finger and quiet arcing contact, and the moving contact includes movable contact rod and sets up the moving arcing contact at the feeler lever front end, its characterized in that: the static arc contact is a columnar contact coaxially arranged in the middle of the static contact finger, the front end of the movable arc contact is provided with an opening, a movable contact finger matched with the peripheral surface of the static arc contact is arranged in the opening, the front end of the movable contact finger is positioned on the inner side of an opening of the opening, and the static arc contact is higher than the static contact finger.
2. The high-voltage switch current structure of claim 1, wherein: the outer wall of the movable contact rod is provided with a ring platform, the movable arc contact is sleeved on the ring platform of the movable contact rod and forms an annular interval with the movable contact rod, the movable contact finger is of a cylindrical structure, and the rear end of the movable contact finger is clamped in the annular interval between the movable arc contact and the movable contact rod in an interference fit mode.
3. The high-voltage switch current structure of claim 1, wherein: the front end of the moving arc contact is provided with an inner folded edge for shielding the moving contact finger.
4. The high-voltage switch current structure according to claim 1, 2 or 3, characterized in that: the movable contact finger is a cylindrical structure formed by punching and rolling a plate, split structures uniformly distributed along the circumference are arranged on the movable contact finger, and the split structures axially extend along the movable contact finger.
5. The high-voltage switch current structure of claim 4, wherein: at least one side edge of the valving structure close to the root thereof is provided with a process notch which is concave to the axis of the valving structure.
6. The moving contact of the through-flow structure of the high-voltage switch comprises a moving contact rod and a moving arc contact arranged at the front end of the contact rod, and is characterized in that: the front end of the movable arc contact is provided with an opening, a movable contact finger matched with the peripheral surface of the static arc contact is arranged in the opening, and the front end of the movable contact finger is positioned on the inner side of an orifice of the opening.
7. A movable contact of a high-voltage switch through-current structure according to claim 6, wherein: the outer wall of the movable contact rod is provided with a ring platform, the movable arc contact is sleeved on the ring platform of the movable contact rod and forms an annular interval with the movable contact rod, the movable contact finger is of a cylindrical structure, and the rear end of the movable contact finger is clamped in the annular interval between the movable arc contact and the movable contact rod in an interference fit mode.
8. A movable contact of a high-voltage switch through-current structure according to claim 6, wherein: the front end of the moving arc contact is provided with an inner folded edge for shielding the moving contact finger.
9. A movable contact of a current structure of a high-voltage switch according to claim 6, 7 or 8, wherein: the movable contact finger is of a cylindrical structure formed by punching and rolling a plate, split structures uniformly distributed along the circumference are arranged on the movable contact finger, and the split structures axially extend along the movable contact finger.
10. A movable contact of a high-voltage switch current structure according to claim 9, wherein: at least one side edge of the valving structure close to the root thereof is provided with a process notch which is concave to the axis of the valving structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910844575.4A CN110660595B (en) | 2019-09-06 | 2019-09-06 | High-voltage switch through-flow structure and moving contact thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910844575.4A CN110660595B (en) | 2019-09-06 | 2019-09-06 | High-voltage switch through-flow structure and moving contact thereof |
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| CN110660595A true CN110660595A (en) | 2020-01-07 |
| CN110660595B CN110660595B (en) | 2022-07-05 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112103122A (en) * | 2020-08-24 | 2020-12-18 | 沈阳金昌蓝宇新材料股份有限公司 | Thin-wall dissimilar metal composite grounding contact and preparation method thereof |
| CN114252765A (en) * | 2021-12-14 | 2022-03-29 | 广西电网有限责任公司桂林供电局 | SF based on switching-on pre-breakdown6Method for evaluating ablation state of breaker contact |
| CN114628193A (en) * | 2021-12-21 | 2022-06-14 | 平高集团有限公司 | Contact assembly of arc extinguish chamber and manufacturing method of moving arc contact of arc extinguish chamber |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112103122A (en) * | 2020-08-24 | 2020-12-18 | 沈阳金昌蓝宇新材料股份有限公司 | Thin-wall dissimilar metal composite grounding contact and preparation method thereof |
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| CN114252765A (en) * | 2021-12-14 | 2022-03-29 | 广西电网有限责任公司桂林供电局 | SF based on switching-on pre-breakdown6Method for evaluating ablation state of breaker contact |
| CN114628193A (en) * | 2021-12-21 | 2022-06-14 | 平高集团有限公司 | Contact assembly of arc extinguish chamber and manufacturing method of moving arc contact of arc extinguish chamber |
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|---|---|
| CN110660595B (en) | 2022-07-05 |
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