CN109036936B - Direct-acting grounding switch - Google Patents
Direct-acting grounding switch Download PDFInfo
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- CN109036936B CN109036936B CN201811119198.XA CN201811119198A CN109036936B CN 109036936 B CN109036936 B CN 109036936B CN 201811119198 A CN201811119198 A CN 201811119198A CN 109036936 B CN109036936 B CN 109036936B
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- contact
- direct
- connecting arm
- acting
- fixed contact
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H31/00—Air-break switches for high tension without arc-extinguishing or arc-preventing means
- H01H31/003—Earthing switches
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- Elimination Of Static Electricity (AREA)
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
The invention discloses a direct-acting type grounding switch which comprises a shell, a first fixed contact, a second fixed contact, a movable contact and a driving mechanism, wherein the driving mechanism is linked with the movable contact; and a limiting block is arranged in the shell and used for preventing the driving mechanism from moving when the shell is in a switching-on state, and the movement is caused by the moving contact bouncing off the first fixed contact. In the invention, because the driving mechanism is linked with the moving contact, if the moving contact bounces off the first fixed contact under the action of large electric power, the driving mechanism can act, and the limiting block is used for preventing the action, the action that the moving contact bounces off the first fixed contact cannot occur. In other words, the direct-acting grounding switch has a self-locking function in a closing state, so that the stability of the closing state is improved, and the occurrence of faults is avoided.
Description
Technical Field
The invention relates to the technical field of grounding switches, in particular to a direct-acting grounding switch.
Background
The direct-acting type grounding switch comprises a shell, and a moving contact, a fixed contact, a second fixed contact and a driving mechanism which are arranged in the shell. The first static contact and the second static contact are distributed at two ends of the movable contact. The moving contact is always connected with the second fixed contact. The moving contact moves linearly under the drive of the driving mechanism to be contacted with or separated from the first fixed contact. When the moving contact is contacted with the first fixed contact, the direct-acting grounding switch realizes switching on; when the moving contact is separated from the first fixed contact, the direct-acting grounding switch realizes brake separation.
When the direct-acting grounding switch is in a closing state, if the current flowing through the direct-acting grounding switch is large, the moving contact is likely to bounce off under the action of large electric power, and electric arcs are generated between the moving contact and the fixed contact, so that accidents are caused.
Therefore, how to avoid the moving contact from bouncing off and improve the stability of the switching-on state of the direct-acting grounding switch is a key problem to be solved urgently by technical personnel in the field.
Disclosure of Invention
The invention aims to avoid the bouncing of a moving contact and improve the stability of the switching-on state of a direct-acting grounding switch.
A direct-acting type grounding switch comprises a shell, a first fixed contact, a second fixed contact, a movable contact and a driving mechanism, wherein the driving mechanism is linked with the movable contact; and a limiting block is arranged in the shell and used for preventing the driving mechanism from moving when the shell is in a switching-on state, and the movement is caused by the moving contact bouncing off the first fixed contact.
Preferably, the drive mechanism comprises: the driving rotating shaft, the crank arm, the connecting arm, the first pin shaft and the second pin shaft are arranged on the connecting arm; one end of the crank arm is connected with the driving rotating shaft, the other end of the crank arm is pivoted with the connecting arm through the first pin shaft, and one end of the connecting arm, far away from the crank arm, is pivoted with the moving contact through the second pin shaft;
when the switch is in a switching-on state, the connecting lever or the connecting arm abuts against the limiting block, the limiting block prevents the connecting lever or the connecting arm from rotating, and the rotation is caused by the moving contact bouncing off the first fixed contact.
Preferably, when the switch is in a switch-on state, an included angle between the connecting lever and the connecting arm is an obtuse angle, and the limiting block is arranged on one side of the moving contact and is positioned on the outer side of the connecting lever or the connecting arm.
Preferably, the driving rotating shaft and the limiting block are located on the same side of the moving contact.
Preferably, the limiting block and the shell are integrated, and the limiting block is installed on the inner wall of the shell through a bolt.
Preferably, a guide block coaxial with the first fixed contact is arranged in the first fixed contact, and the guide block is in clearance fit with an inner cavity of the movable contact.
Preferably, the guide block is made of an insulating material.
Preferably, the first fixed contact and the second fixed contact both include a plurality of contact fingers, the cylindrical contact finger group matched with the movable contact is formed by the plurality of contact fingers, a spring member is arranged on the outer side of the contact finger group, and the spring member acts on the contact finger group to enable the contact finger group to have elastic holding force.
Preferably, the inner diameter of the contact finger group is smaller than the outer diameter of the movable contact.
Preferably, the connection arm is made of an insulating material.
According to the technical scheme, the direct-acting grounding switch comprises the limiting block. Because actuating mechanism and moving contact linkage, if the moving contact bounces off first static contact under the effect of big electric power, then can lead to actuating mechanism to move, and the stopper is used for preventing the emergence of this action, then the moving contact bounces off the action of first static contact and also can't take place. In other words, the direct-acting grounding switch has a self-locking function in a closing state, so that the stability of the closing state is improved, and the occurrence of faults is avoided.
Drawings
In order to more clearly illustrate the solution of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a direct-acting grounding switch according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a gate-off according to an embodiment of the present invention;
fig. 3 is a schematic diagram of closing according to an embodiment of the present invention.
The device comprises a shell, a first fixed contact 1, a contact finger group 11, a second fixed contact 2, a movable contact 3, a driving rotating shaft 4, a crank arm 5, a first pin shaft 6, a connecting arm 7, a second pin shaft 8, a limiting block 9 and a shell 10.
Detailed Description
The invention discloses a direct-acting grounding switch which has a self-locking function in a closing state, so that the bouncing of a moving contact is avoided, and the stability of the direct-acting grounding switch in the closing state is improved.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of 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 of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
Please refer to fig. 1-3. In an embodiment of the present invention, the direct-acting type ground switch includes: the device comprises a shell 10, a first fixed contact 1, a second fixed contact 2, a movable contact 3, a driving mechanism and a limiting block 9.
The first fixed contact 1, the second fixed contact 2, the movable contact 3, the driving mechanism and the limiting block 9 are all arranged in the shell 10. The moving contact 3 is always in matching contact with the second fixed contact 2. The moving contact 3 is driven by the driving mechanism to do linear motion. The moving contact 3 can be inserted into the first fixed contact 1 under the driving of the driving mechanism, so that the switching-on is realized. The moving contact 3 can be separated from the first fixed contact 1 under the driving of the driving mechanism, so that the brake is separated.
In a closing state, under the action of large electric power, the movable contact 3 tends to bounce off the first fixed contact 1. Because the movable contact 3 is linked with the driving mechanism, if the movable contact 3 is bounced off the first fixed contact 1, the bouncing off action of the movable contact 3 can cause the driving mechanism to act, and the limit block 9 is just used for preventing the action of the driving mechanism. Since the driving mechanism cannot perform this action, the movable contact 3 cannot be ejected from the first stationary contact 1. In other words, the direct-acting grounding switch in the embodiment has a closing self-locking function, and can avoid the moving contact 3 from bouncing off, so that the stability of the closing state of the direct-acting grounding switch is improved.
Further, in order to improve the stability of the direct-acting earthing switch, the driving mechanism is provided as an insulated driving mechanism. The drive mechanism is only used for converting the rotation of the drive rotating shaft 4 into the movement of the movable contact 3, and current does not flow through the drive rotating shaft. Further, the connecting arm 7 is defined by an insulating material. As long as the connecting arm 7 is insulated, the entire drive mechanism is insulated. The mechanical coupling properties of the insulating material are poor, and the connecting arm 7 does not involve a fixed connection to the drive shaft 4, thus defining that the connecting arm 7 is made of an insulating material.
In one embodiment of the present invention, the driving mechanism includes: the device comprises a driving rotating shaft 4, a crank arm 5, a connecting arm 7, a first pin shaft 6 and a second pin shaft 8. Wherein, the driving rotating shaft 4 is connected with one end of the crank arm 5 and can drive the crank arm 5 to rotate forwards or backwards. The other end of the crank arm 5 is pivoted with the connecting arm 7 through a first pin shaft 6. One end of the connecting arm 7 far away from the crank arm 5 is pivoted with the movable contact 3 through a second pin shaft 8. The driving force of the driving rotating shaft 4 is transmitted to the moving contact 3 through the crank arm 5 and the connecting arm 7 in sequence, and the moving contact 3 is always matched with the second fixed contact 2 and is limited by the matching relation, so that the moving contact 3 moves linearly under the driving of the driving rotating shaft 4. Specifically, when the driving rotating shaft 4 is limited to rotate towards one direction, the moving contact 3 is inserted into the first fixed contact 1, so that switching-on is realized; when the driving rotating shaft 4 rotates towards the other direction, the movable contact 3 is drawn out from the first fixed contact 1, so that the brake is separated.
In this embodiment, in a closing state, that is, when the movable contact 3 is inserted into the first stationary contact 1, the connecting lever 5 or the connecting arm 7 abuts against the stopper 9. Under the action of large electric power, the movable contact 3 tends to bounce off the first fixed contact 1, if the movable contact 3 bounces off the first fixed contact 1, the connecting lever 5 and the connecting arm 7 are caused to rotate, and the limiting block 9 is just used for preventing the rotation, so that the action of bouncing off the first fixed contact 1 by the movable contact 3 cannot occur.
Further, in a closing state, an included angle between the crank arm 5 and the connecting arm 7 is an obtuse angle. The connecting lever 5 and the connecting arm 7 are positioned on one side of the movable contact 3, and the limiting block 9 is also arranged on the side and positioned on the outer side of the connecting lever 5 or the connecting arm 7. And the connecting lever 5 or the connecting arm 7 at the moment just leans against the limit block 9.
Furthermore, the limit block 9 and the driving rotating shaft 4 are arranged on the same side of the movable contact 3. In other words, the driving means are not located on the straight line of the movable contact 3, but are offset from the straight line, so that the crank arm 5, the connecting arm 7 and the movable contact 3 constitute an eccentric slider-crank mechanism, as shown in fig. 2 and 3. The eccentric arrangement can ensure that the crank arm 5 and the connecting arm 7 can realize the switching-on and switching-off of the moving contact 3 under the condition of small rotating amplitude. Therefore, the volume of the direct-acting grounding switch is reduced, and the structure of the direct-acting grounding switch is more compact.
Fig. 3 is a schematic diagram of closing, and the specific process is as follows: the driving rotating shaft 4 rotates anticlockwise, the connecting lever 5 and the connecting arm 7 also rotate anticlockwise, the moving contact 3 is driven to move upwards and is inserted into the first fixed contact 1, when the connecting lever 5 and the connecting arm 7 form a straight line, the moving contact 3 reaches an upper limit, the connecting lever 5 and the connecting arm 7 form an obtuse angle along with further rotation of the connecting lever 5 and the connecting arm 7, and the moving contact 3 falls back downwards and reaches a switching-on position.
Fig. 2 is a schematic diagram of the opening process, and the specific process is as follows: the driving rotating shaft 4 rotates clockwise, the crank arm 5 and the connecting arm 7 also rotate clockwise, the obtuse angle of the crank arm 5 and the connecting arm 7 is changed into a zero angle, the moving contact 3 reaches the upper limit again, the included angle between the crank arm 5 and the connecting arm 7 is changed into an obtuse angle again, the included angle is changed into an acute angle finally, and the moving contact 3 is completely separated from the first static contact 1.
The limiting block 9 and the shell 10 can be integrated and integrally machined and molded. Or split type, and the two are connected by bolts. The bolt connection is convenient to detach and replace.
In an embodiment of the present invention, a guide block is disposed in the first stationary contact 1, and the guide block is in clearance fit with an inner cavity of the movable contact 3. When the moving contact 3 is inserted into the first fixed contact 1, the moving contact 3 is sleeved outside the guide block, and the moving contact 3 moves under the guide effect of the guide block. The inner cavity of the first static contact 1 is columnar, and the moving contact 3 is cylindrical. The guide block is columnar and coaxial with the first fixed contact 1. By the arrangement, the movable contact 3 inserted into the first fixed contact 1 can be ensured to be coaxial with the first fixed contact 1 all the time, and the movable contact 3 and the first fixed contact 1 are ensured to have uniform contact pressure. If the contact pressure between the moving contact 3 and one side of the first fixed contact 1 is small and the contact pressure between the moving contact and the other side of the first fixed contact 1 is large, when a large current flows in the direct-acting grounding switch, the side with the small contact pressure generates a large amount of heat, and then ablation is caused.
Further, the material of the guide block is preferably an insulating material. Prevent the guide block and the movable contact 3 from generating heat and ablating due to poor contact. Because the difficult assurance of machining precision and mechanical properties of insulating material are poor, in order to make the direction of movable contact good and guarantee the intensity of guide block simultaneously, can be limited the material of guide block for the material that the through-flow capacity is lower than the contact finger, for example steel. The first stationary contact 1 and the second stationary contact are each formed by a plurality of contact fingers, as will be described in more detail below.
In an embodiment of the present invention, the first stationary contact 1 includes a plurality of contact fingers. The contact fingers form a cylindrical contact finger group 11, and the inner cavity of the contact finger group 11 is in fit contact with the movable contact 3. In addition, a spring element is arranged outside the contact finger group 11 and is used for pressing the contact finger group 11, so that the contact finger group 11 has elastic holding force. In this embodiment, the holding force of the first fixed contact 1 can be adjusted by the adjusting spring member to match with the movable contact 3, so as to hold the movable contact 3 tightly. The second stationary contact 2 may be configured with the same structure as the first stationary contact 1, and is not described herein again.
Further, the inner diameter of the contact finger group 11 is designed to be smaller than the outer diameter of the movable contact 3, so that after the movable contact 3 enters the contact finger group 11, the contact finger group 11 can form holding force on the movable contact 3, and stable contact between the movable contact 3 and the first fixed contact 1 is ensured.
Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A direct-acting type grounding switch comprises a shell (10), a first fixed contact (1), a second fixed contact (2), a movable contact (3) and a driving mechanism, and is characterized in that the driving mechanism is linked with the movable contact (3); a limiting block (9) is arranged in the shell (10), and in a switching-on state, the limiting block (9) is used for preventing the movement of the driving mechanism, and the movement is caused by the moving contact (3) bouncing away from the first fixed contact (1);
the drive mechanism includes: the device comprises a driving rotating shaft (4), a crank arm (5), a connecting arm (7), a first pin shaft (6) and a second pin shaft (8); one end of the crank arm (5) is connected with the driving rotating shaft (4), the other end of the crank arm is pivoted with the connecting arm (7) through the first pin shaft (6), and one end, far away from the crank arm (5), of the connecting arm (7) is pivoted with the moving contact (3) through the second pin shaft (8);
when the switch is switched on, the connecting lever (5) or the connecting arm (7) is abutted against the limiting block (9), the limiting block (9) prevents the connecting lever (5) or the connecting arm (7) from rotating, and the rotation is caused by the moving contact (3) bouncing away from the first fixed contact (1).
2. The direct-acting earthing switch according to claim 1, characterized in that, in a closing state, an included angle between the connecting lever (5) and the connecting arm (7) is an obtuse angle, and the limiting block (9) is disposed at one side of the moving contact (3) and located at an outer side of the connecting lever (5) or the connecting arm (7).
3. The direct-acting earthing switch according to claim 2, characterized in that said driving shaft (4) and said limit block (9) are located on the same side of said movable contact (3).
4. The direct-acting earthing switch according to claim 2, characterized in that the stopper (9) is integrated with the housing (10), or the stopper (9) is mounted on the inner wall of the housing (10) by means of a bolt.
5. The direct-acting earthing switch according to claim 1, characterized in that a guide block coaxial with the first stationary contact (1) is disposed in the first stationary contact (1), and the guide block is in clearance fit with an inner cavity of the movable contact (3).
6. The direct acting earthing switch according to claim 5, characterized in that said guide block is made of insulating material.
7. The direct-acting type grounding switch according to claim 1, wherein the first stationary contact (1) and the second stationary contact each comprise a plurality of contact fingers, the plurality of contact fingers form a cylindrical contact finger group (11) which is matched with the movable contact (3), and a spring member is disposed outside the contact finger group (11) and acts on the contact finger group (11), so that the contact finger group (11) has an elastic holding force.
8. Direct acting earthing switch according to claim 7, characterized in that the internal diameter of said set of contact fingers (11) is smaller than the external diameter of said movable contact (3).
9. Direct-acting earthing switch according to claim 1, characterized in that said connecting arm (7) is made of insulating material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811119198.XA CN109036936B (en) | 2018-09-25 | 2018-09-25 | Direct-acting grounding switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811119198.XA CN109036936B (en) | 2018-09-25 | 2018-09-25 | Direct-acting grounding switch |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109036936A CN109036936A (en) | 2018-12-18 |
| CN109036936B true CN109036936B (en) | 2020-08-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811119198.XA Active CN109036936B (en) | 2018-09-25 | 2018-09-25 | Direct-acting grounding switch |
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| CN (1) | CN109036936B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112003182B (en) * | 2020-08-27 | 2021-11-30 | 杭州巨骐信息科技股份有限公司 | Intelligent grounding system applied to high-voltage cable |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3695214B2 (en) * | 1999-04-06 | 2005-09-14 | 株式会社日立製作所 | Insulated switchgear |
| CN202172032U (en) * | 2011-07-25 | 2012-03-21 | 中国西电电气股份有限公司 | High voltage grounding switch device with closing self-locking function |
| CN202352555U (en) * | 2011-11-19 | 2012-07-25 | 中国西电电气股份有限公司 | Ground switch capable of realizing self locking by utilizing electromotive force |
| CN103151212A (en) * | 2013-02-25 | 2013-06-12 | 贵州中泉电气集团有限公司 | Loop self-locking load switch |
| CN106710947A (en) * | 2017-02-07 | 2017-05-24 | 平高集团有限公司 | Direct-acting type three-station load switch and switch cabinet with load switch |
-
2018
- 2018-09-25 CN CN201811119198.XA patent/CN109036936B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3695214B2 (en) * | 1999-04-06 | 2005-09-14 | 株式会社日立製作所 | Insulated switchgear |
| CN202172032U (en) * | 2011-07-25 | 2012-03-21 | 中国西电电气股份有限公司 | High voltage grounding switch device with closing self-locking function |
| CN202352555U (en) * | 2011-11-19 | 2012-07-25 | 中国西电电气股份有限公司 | Ground switch capable of realizing self locking by utilizing electromotive force |
| CN103151212A (en) * | 2013-02-25 | 2013-06-12 | 贵州中泉电气集团有限公司 | Loop self-locking load switch |
| CN106710947A (en) * | 2017-02-07 | 2017-05-24 | 平高集团有限公司 | Direct-acting type three-station load switch and switch cabinet with load switch |
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| Publication number | Publication date |
|---|---|
| CN109036936A (en) | 2018-12-18 |
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