CN216250541U - Vacuum arc-extinguishing chamber contact structure - Google Patents
Vacuum arc-extinguishing chamber contact structure Download PDFInfo
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- CN216250541U CN216250541U CN202121958387.3U CN202121958387U CN216250541U CN 216250541 U CN216250541 U CN 216250541U CN 202121958387 U CN202121958387 U CN 202121958387U CN 216250541 U CN216250541 U CN 216250541U
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Abstract
The utility model discloses a contact structure of a vacuum arc extinguish chamber, which comprises a contact cup, a contact blade, a supporting piece, a connecting piece, a screw rod and a movable conducting rod, wherein the contact blade is arranged on the lower plane of the contact cup; an inner groove is formed in the bottom of the contact cup, the top end of the connecting piece is arranged in the inner groove of the contact cup, and the top end of the connecting piece is attached to the lower plane of the inner groove of the contact cup; the top end of the screw rod sequentially penetrates through the connecting piece, the contact cup and the movable conducting rod; the contact piece is provided with an annular groove, and the bottom end of the supporting piece is arranged in the annular groove on the contact piece; the upper part of the supporting piece is sleeved on the lower part of the connecting piece in a sliding manner; a gap is arranged between the upper part of the supporting piece and the inner groove of the contact cup. According to the utility model, the supporting piece and the connecting piece are added in the contact cup of the vacuum arc-extinguishing chamber, so that the switching-on bounce of the vacuum arc-extinguishing chamber is reduced, and the forced deformation of the contact caused by the fusion welding force of the contact in the switching-off process is avoided; the connecting piece, the contact cup and the movable conducting rod are connected together in a bolt mode, so that the parts are easy to machine, and the reliability is high.
Description
Technical Field
The utility model relates to the field of medium and high voltage vacuum switches, in particular to a contact structure of a vacuum arc extinguish chamber.
Background
The vacuum switch is a key device in the field of power transmission and distribution, and about 95 percent of switch devices in a medium-voltage distribution grade power system in China adopt the vacuum switch. The vacuum arc-extinguishing chamber is a core component of the vacuum switch and bears the main functions of the switch equipment: the short circuit current and the rated current are switched on and off, and the rated voltage and the rated overvoltage of the system are borne during opening and closing.
At present, when a vacuum arc extinguish chamber is switched on, the moving contact has great kinetic energy due to the fact that the switching-on speed is high, and the moving contact can be bounced off due to the switching-on impact force in the moment that the moving contact is contacted with the fixed contact. At the moment, because the distance between the moving contact and the fixed contact is small, the contact gap is broken down, the current flows along the breakdown channel, and large joule heat is generated on the contact, so that the surface of the contact is locally melted. When the melting areas on the surfaces of the moving contact and the static contact are contacted with the contact under pressure, the melting areas are bonded together and solidified after the temperature is reduced, and fusion welding occurs on the surfaces of the contacts. In addition, the switching-on bounce can also cause switching-on overvoltage, and the safety of the power system is seriously influenced. If the contact surface is welded, when the contact is opened, the welding force bonds the contacts together, and under the combined action of the opening force and the welding force, the contact is deformed, the opening characteristic of the switch is influenced, and the contact is pulled apart or cannot be opened seriously.
Therefore, how to design a vacuum arc-extinguishing chamber contact structure for preventing the contact from deforming or damaging due to contact fusion welding becomes an urgent problem to be solved.
SUMMERY OF THE UTILITY MODEL
The utility model provides a contact structure of a vacuum arc extinguish chamber, which avoids the deformation or damage of a contact caused by fusion welding of the contact.
The utility model provides a contact structure of a vacuum arc extinguish chamber, which comprises a contact cup, a contact blade, a supporting piece, a connecting piece, a screw rod and a movable conducting rod, wherein:
the contact blade is arranged on the lower plane of the contact cup;
an inner groove is formed in the bottom of the contact cup, the top end of the connecting piece is arranged in the inner groove of the contact cup, and the top end of the connecting piece is attached to the lower plane of the inner groove of the contact cup;
the top end of the screw rod sequentially penetrates through the connecting piece, the contact cup and the movable conducting rod;
the contact piece is provided with an annular groove, and the bottom end of the supporting piece is arranged in the annular groove on the contact piece;
the upper part of the supporting piece is slidably sleeved on the lower part of the connecting piece;
and a gap is reserved between the upper part of the supporting piece and the inner groove of the contact cup.
Optionally, the width between the two inner side walls of the supporting member is greater than the width between the two inner side walls of the connecting member.
Optionally, the width between the top ends of the support members is greater than the width between the top ends of the connecting members.
Compared with the prior art, the utility model has the following advantages: by adding the reasonably designed supporting piece and connecting piece in the contact cup of the vacuum arc extinguish chamber, the switching-on bounce of the vacuum arc extinguish chamber is reduced, and the stress deformation of the contact caused by the fusion welding force of the contact in the switching-off process is avoided; the connecting piece, the contact cup and the movable conducting rod are connected together in a bolt mode, so that the parts are easy to machine, and the reliability is high.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any inventive exercise.
Fig. 1 is a front sectional view of a contact structure of a vacuum arc-extinguishing chamber provided by the utility model.
Figure 2 illustrates the structural and dimensional requirements of the support of a vacuum interrupter contact structure according to the present invention.
Figure 3 illustrates the structural and dimensional requirements of the connecting piece of a vacuum interrupter contact structure provided for the present invention.
Illustration of the drawings:
wherein, 1-contact cup; 2-a contact blade; 3-a support; 4-a connector; 5-a screw; 6-moving conductive rod.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described, and it will be appreciated by those skilled in the art that the present invention may be embodied without departing from the spirit and scope of the utility model, and therefore the present invention is not limited to the specific embodiments disclosed below.
Referring to fig. 1, the present invention provides a contact structure of a vacuum arc-extinguishing chamber, comprising a contact cup 1, a contact blade 2, a support member 3, a connecting member 4, a screw 5 and a movable conductive rod 6, wherein:
the contact blade 2 is arranged on the lower plane of the contact cup 1;
an inner groove is formed in the bottom of the contact cup 1, the top end of the connecting piece 4 is arranged in the inner groove of the contact cup 1, and the top end of the connecting piece 4 is attached to the lower plane of the inner groove of the contact cup 1;
the top end of the screw rod 5 sequentially penetrates through the connecting piece 4, the contact cup 1 and the movable conducting rod 6, a through hole is formed in the bottom of the contact cup 1, a threaded hole is formed in the bottom end of the movable conducting rod 6, and the connecting piece 4, the contact cup 1 and the movable conducting rod 6 are connected together through the screw rod 5, so that the purpose of fixing the connecting piece 4 on the contact cup 1 is achieved;
an annular groove is formed in the contact blade 2, the bottom end of the supporting piece 3 is arranged in the annular groove in the contact blade 2, and the bottom end of the supporting piece 3 is welded in the annular groove in the contact blade 2;
the upper part of the supporting piece 3 is slidably sleeved at the lower part of the connecting piece 4, and the supporting piece 3 and the connecting piece 4 are connected together by virtue of a non-contact step structure between hollow cylinders, so that the functions of bounce reduction and fusion welding resistance are realized;
a gap is reserved between the upper part of the supporting piece 3 and the inner groove of the contact cup 1.
The contact blade 2 and the support piece 3 can move a distance to the bottom of the contact cup 1 at the moment when the moving contact and the static contact are contacted until the support piece 3 is contacted with the bottom of the contact cup 1, the counter force generated by rigid collision of the contact during switching-on can be reduced in the process, the bounce is reduced, the support piece 3 can support the contact cup 1, and the contact cup 1 is guaranteed not to be seriously deformed and damaged during switching-on. When the vacuum arc-extinguishing chamber is opened, the supporting piece 3 is connected with the contact cup 1 through the connecting piece 4, so that a force which is consistent with the opening direction can be applied to the welding part of the contact and the supporting piece 3, and the local area of the contact is prevented from being damaged by overlarge fusion welding force.
Referring to fig. 2 and 3, alternatively, the width d between the two inner side walls of the support 332Is larger than the width d between the two inner side walls of the connecting piece 442。
Alternatively, the width d between the top ends of said supports 331Is larger than the width d between the top ends of the connecting pieces 441。
Optionally, a gap L between the upper portion of the support member 3 and the inner recess of the contact cup 11Is 0.5mm-1 mm.
Alternatively, the sliding distance L between the upper part of the support 3 and the lower part of the connecting element 42Is 0.5mm-2 mm.
Compared with the prior art, the utility model has the following advantages: by adding the reasonably designed supporting piece and connecting piece in the contact cup of the vacuum arc extinguish chamber, the switching-on bounce of the vacuum arc extinguish chamber is reduced, and the stress deformation of the contact caused by the fusion welding force of the contact in the switching-off process is avoided; the connecting piece 4, the contact cup 1 and the movable conducting rod are connected together in a bolt mode, so that the parts are easy to process, and the reliability is high.
The foregoing is merely a detailed description of the utility model, and it should be noted that modifications and adaptations by those skilled in the art may be made without departing from the principles of the utility model, and should be considered as within the scope of the utility model.
Claims (3)
1. The utility model provides a vacuum interrupter contact structure, its characterized in that, vacuum interrupter contact structure includes contact cup (1), contact blade (2), support piece (3), connecting piece (4), screw rod (5) and moves conducting rod (6), wherein:
the contact blade (2) is arranged on the lower plane of the contact cup (1);
an inner groove is formed in the bottom of the contact cup (1), the top end of the connecting piece (4) is arranged in the inner groove of the contact cup (1), and the top end of the connecting piece (4) is attached to the lower plane of the inner groove of the contact cup (1);
the top end of the screw rod (5) sequentially penetrates through the connecting piece (4), the contact cup (1) and the movable conducting rod (6);
an annular groove is formed in the contact blade (2), and the bottom end of the supporting piece (3) is arranged in the annular groove in the contact blade (2);
the upper part of the supporting piece (3) is slidably sleeved on the lower part of the connecting piece (4);
a gap is reserved between the upper part of the supporting piece (3) and the inner groove of the contact cup (1).
2. Vacuum interrupter contact structure according to claim 1, characterized in that the width between the two inner side walls of the support (3) is larger than the width between the two inner side walls of the connecting piece (4).
3. Vacuum interrupter contact arrangement according to claim 2, characterized in that the width between the tips of the support (3) is larger than the width between the tips of the connecting piece (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121958387.3U CN216250541U (en) | 2021-08-19 | 2021-08-19 | Vacuum arc-extinguishing chamber contact structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121958387.3U CN216250541U (en) | 2021-08-19 | 2021-08-19 | Vacuum arc-extinguishing chamber contact structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216250541U true CN216250541U (en) | 2022-04-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121958387.3U Active CN216250541U (en) | 2021-08-19 | 2021-08-19 | Vacuum arc-extinguishing chamber contact structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216250541U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117038385A (en) * | 2023-09-06 | 2023-11-10 | 西安交通大学 | Contact with non-shunt supporting structure and vacuum arc-extinguishing chamber using same |
-
2021
- 2021-08-19 CN CN202121958387.3U patent/CN216250541U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117038385A (en) * | 2023-09-06 | 2023-11-10 | 西安交通大学 | Contact with non-shunt supporting structure and vacuum arc-extinguishing chamber using same |
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