阅读说明：本技术 一种单稳态开关 (Monostable switch ) 是由 项贤文 于 2020-12-15 设计创作，主要内容包括：本发明公开了一种单稳态开关,包括绝缘壳和外接壳,绝缘壳内固定安装真空灭弧室,真空灭弧室内安装有定导电杆和动导电杆,定导电杆和动导电杆分别电性连接定触头和动触头,动导电杆通过绝缘子固定连接连接杆,连接杆的下端端部固定连接涡流盘,涡流盘的端面靠近有合闸线圈,连接杆的外圈固定连接拉力板,外接壳内壁固定连接支板,支板与拉力板之间通过复位弹簧连接,动导电杆的侧壁电性连接软导电线,软导电线电性连接导电体；本发明利用接地故障支路的零序电路电流发生变化,外接电路电流流经合闸线圈与铝盘作用产生相斥磁力,使得动触头与定触头短暂接触,进行换流,本发明结构简单,方便安装,造价低,降低了生产成本。(The invention discloses a monostable switch, which comprises an insulating shell and an external shell, wherein a vacuum arc extinguish chamber is fixedly installed in the insulating shell, a fixed conducting rod and a movable conducting rod are installed in the vacuum arc extinguish chamber, the fixed conducting rod and the movable conducting rod are respectively and electrically connected with a fixed contact and a movable contact, the movable conducting rod is fixedly connected with a connecting rod through an insulator, the lower end part of the connecting rod is fixedly connected with an eddy current disc, the end surface of the eddy current disc is close to a closing coil, the outer ring of the connecting rod is fixedly connected with a tension plate, the inner wall of the external shell is fixedly connected with a support plate, the support plate is connected with the tension plate through a reset spring, the side wall of the movable conducting rod is electrically; the invention utilizes the change of the zero sequence circuit current of the grounding fault branch circuit, and the current of the external circuit flows through the closing coil to act with the aluminum disc to generate repulsive magnetic force, so that the moving contact is momentarily contacted with the fixed contact for current conversion.)

1. A monostable switch, includes insulating casing and external shell, its characterized in that: the vacuum arc extinguish chamber is fixedly installed in the insulating shell, a fixed conducting rod and a movable conducting rod are installed in the vacuum arc extinguish chamber, the end parts, close to the fixed conducting rod and the movable conducting rod, of the fixed conducting rod and the movable conducting rod are respectively and electrically connected with a fixed contact and a movable contact, the end part, located outside the vacuum arc extinguish chamber, of the movable conducting rod is fixedly connected with a connecting rod through an insulator, the lower end part of the connecting rod is fixedly connected with an eddy current disc, the end face of the eddy current disc is close to a closing coil, the closing coil is installed on the outer connecting shell, the closing coil is externally connected with a circuit, the outer ring of the connecting rod is fixedly connected with a tension plate, the inner wall of the outer connecting shell is fixedly connected with a support plate, the support plate is connected with the tension plate through a reset spring, the side wall of the movable.

2. A monostable switch according to claim 1, characterised in that: the end part of the fixed conducting rod is electrically connected with a fixed conducting block, the fixed conducting block is fixedly installed at the end part of the vacuum arc extinguish chamber, and a bus cable is welded on the fixed conducting block.

3. A monostable switch according to claim 1, characterised in that: the shell of the vacuum arc-extinguishing chamber is a ceramic shell, and the inner wall of the vacuum arc-extinguishing chamber is positioned at the contact outer side of the moving contact and the fixed contact and is provided with a shielding cylinder.

4. A monostable switch according to claim 1, characterised in that: the reset spring is sleeved with a limiting rod, one end of the limiting rod is fixedly connected with the insulating plate, and the other end of the limiting rod penetrates through the support plate and is fixedly connected with the limiting disc in a sliding mode.

5. A monostable switch according to claim 4, characterised in that: the supporting plate is located at the side edge of the limiting rod and is fixedly connected with a limiting block, and a rubber sleeve is sleeved at the upper end of the limiting block.

6. A monostable switch according to claim 1, characterised in that: the outer ring of the insulating ejector rod is fixedly sleeved with an armature, the outer ring of the insulating ejector rod is slidably sleeved with an insulating block, a permanent magnet is embedded and connected into one side face, close to the armature, of the insulating block, and the insulating block is fixedly connected with an outer shell through a connecting rod.

Technical Field

The invention relates to the technical field of circuit safety control, in particular to a monostable switch.

Background

The monostable circuit is a basic pulse unit circuit with two working states of a steady state and a transient state, and the circuit is in the steady state when no external signal is triggered. Under the trigger of an external signal, the circuit is turned from a steady state to a transient state, and after a period of time, the circuit automatically returns to the steady state, the length of the transient state time depends on the parameters of the circuit, and is irrelevant to the length of the action time of the trigger signal, so that the monostable circuit is a monostable switch as a main component.

The fault grounding refers to the accidental connection of a conductor and the ground, the over-current protection arranged on the electric circuit is also used as the grounding fault protection, the grounding fault protection is realized by using zero-sequence current, and the grounding fault protection is realized by using residual current. When the three-phase four-wire system distribution line normally operates, if the three-phase load is completely balanced and has no harmonic current, and normal leakage current is ignored, the current flowing through the neutral line N is 0, namely zero-sequence current is 0; if the three-phase load is unbalanced, zero sequence current is generated, if a certain phase has ground fault, the zero sequence current is greatly increased, so that a signal of the ground fault can be obtained by detecting the change of the zero sequence current value, and the action current of the ground fault protection is larger than the three-phase unbalanced current.

Disclosure of Invention

The invention mainly aims to provide a monostable switch, which utilizes the change of zero sequence circuit current of a ground fault branch circuit, and the current flows through a closing coil to act with an eddy current disc to generate repulsive magnetic force, so that a moving contact is temporarily contacted with a fixed contact.

In order to achieve the purpose, the invention adopts the technical scheme that: a monostable switch comprises an insulating shell and an external shell, wherein a vacuum arc extinguish chamber is fixedly installed in the insulating shell, a fixed conducting rod and a movable conducting rod are installed in the vacuum arc extinguish chamber, the ends, close to the fixed conducting rod and the movable conducting rod, of the fixed conducting rod and the movable conducting rod are respectively and electrically connected with a fixed contact and a movable contact, the end, located outside the vacuum arc extinguish chamber, of the movable conducting rod is fixedly connected with a connecting rod through an insulator, the end part of the lower end of the connecting rod is fixedly connected with an eddy current disc, the end face of the eddy current disc is close to a closing coil, the closing coil is installed on the external shell, the closing coil is externally connected with a circuit, the outer ring of the connecting rod is fixedly connected with a tension plate, the inner wall of the external shell is fixedly connected with a support plate, the support plate is connected with the tension plate through a reset spring, the conductor is fixedly connected with the insulating shell.

Preferably, the end part of the fixed conducting rod is electrically connected with a fixed conducting block, the fixed conducting block is fixedly arranged at the end part of the vacuum arc extinguish chamber, and a bus cable is welded on the fixed conducting block.

Preferably, the shell of the vacuum arc-extinguishing chamber is a ceramic shell, and the inner wall of the vacuum arc-extinguishing chamber is provided with a shielding cylinder at the contact outer side of the moving contact and the fixed contact.

Preferably, the reset spring is sleeved with a limiting rod, one end of the limiting rod is fixedly connected with the tension plate, and the other end of the limiting rod penetrates through the support plate and is fixedly connected with the limiting disc in a sliding mode.

Preferably, the support plate is located the side fixed connection stopper of gag lever post, the upper end of stopper cup joints the rubber sleeve.

Preferably, the outer ring of the connecting rod is fixedly sleeved with the armature, the outer ring of the connecting rod is slidably sleeved with the insulating block, one side face, close to the armature, of the insulating block is embedded and connected with the permanent magnet, and the insulating block is fixedly connected with the outer shell through the connecting rod.

Compared with the prior art, the invention has the following beneficial effects: the invention utilizes the change of the zero sequence circuit current of the grounding fault branch circuit, and the current flows through the closing coil to act with the vortex disc to generate repulsive magnetic force, so that the moving contact is momentarily contacted with the fixed contact.

Drawings

FIG. 1 is a schematic diagram of the overall structure normal state structure of the present invention;

FIG. 2 is an enlarged schematic view of A of FIG. 1 in accordance with the present invention;

FIG. 3 is a schematic diagram of the overall structure transient structure of the present invention.

In the figure: 1. an insulating case; 2. a vacuum arc-extinguishing chamber; 3. fixing a conducting rod; 4. a movable conductive rod; 5. fixing a contact; 6. a moving contact; 7. a vortex disk; 8. a closing coil; 9. a connecting rod; 10. a tension plate; 11. a support plate; 12. a return spring; 13. a soft conductive wire; 14. fixing a conductive block; 15. mother flat cable; 16. a shielding cylinder; 17. a limiting rod; 18. a limiting disc; 19. a limiting block; 20. a rubber sleeve; 21. a connecting rod; 22. an external connection shell; 23. an insulator; 24. an electrical conductor; 25. an armature; 26. an insulating block; 27. and a permanent magnet.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

As shown in fig. 1-3, a monostable switch includes an insulating housing 1 and an external housing 22, a vacuum arc-extinguishing chamber 2 is fixedly installed in the insulating housing 1, a fixed conducting rod 3 and a movable conducting rod 4 are installed in the vacuum arc-extinguishing chamber 2, the ends of the fixed conducting rod 3 and the movable conducting rod 4 close to each other are respectively and electrically connected with a fixed contact 5 and a movable contact 6, the end of the movable conducting rod 4 located outside the vacuum arc-extinguishing chamber 2 is fixedly connected with a connecting rod 21 through an insulator 23, the lower end of the connecting rod 21 is fixedly connected with an eddy current disc 7, the end face of the eddy current disc 7 is close to a closing coil 8, the closing coil 8 is installed on the external housing 22, the closing coil 8 is externally connected with a circuit, the outer ring of the connecting rod 21 is fixedly connected with a tension plate 10, the inner wall of the external housing 22 is fixedly connected with a support plate 11, the support plate 11 is connected with, the side wall of the movable conducting rod 4 is electrically connected with a soft conducting wire 13, the soft conducting wire 13 is electrically connected with a conductor 24, and the conductor 24 is fixedly connected with the insulating shell 1.

During the concrete implementation, the monostable switch of this structure inserts in the application circuit, when ground circuit broke down, zero sequence current changes and produces the electric capacity current, the detector detects the electric current, start the circuit of closing coil 8, closing coil 8 electricity is magnetized, vortex disc 7 is close to with closing coil 8 and produces repulsive magnetic field, reaction force makes vortex disc 7 to keeping away from closing coil 8 direction removal, make moving contact 6 and fixed contact 5 contact, produce transient state current, and moving contact 6 and fixed contact 5 separation under reset spring 12's effect, realize the protection circuit, this monostable switch simple structure, easy to assemble, the cost is low, and production cost is reduced.

In this embodiment, the end of the fixed conducting rod 3 is electrically connected to a fixed conducting block 14, the fixed conducting block 14 is fixedly installed at the end of the vacuum arc-extinguishing chamber 2, and a bus cable 15 is welded on the fixed conducting block 14.

In this embodiment, the housing of the vacuum interrupter 2 is a ceramic housing, and the shielding cylinder 16 is installed on the inner wall of the vacuum interrupter 2 at the outer side of the contact between the moving contact 6 and the fixed contact 5.

In this embodiment, the return spring 12 is sleeved with a limiting rod 17, one end of the limiting rod 17 is fixedly connected with the tension plate 10, and the other end of the limiting rod 17 slides through the support plate 11 to be fixedly connected with a limiting disc 18.

In this embodiment, the support plate 11 is located the side fixed connection stopper 19 of gag lever post 17, rubber sleeve 20 is cup jointed to the upper end of stopper 19.

In this embodiment, the outer ring of the connecting rod 21 is fixedly sleeved with the armature 25, the outer ring of the connecting rod 21 is slidably sleeved with the insulating block 26, a permanent magnet 27 is embedded and connected to one side surface of the insulating block 26 close to the armature 25, and the insulating block 26 is fixedly connected with the outer shell 22 through the connecting rod 9.

While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that the described embodiments may be modified in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are illustrative in nature and should not be construed as limiting the scope of the invention.